Check fire valve for flue

Abstract

The invention discloses a check fire valve for a flue, comprising a lampblack channel comprising an outer casing. The lampblack channel is provided with an air inlet and an air outlet which are opposite to each other; two oppositely arranged valve plates are arranged in the lampblack channel; and are rotatablely arranged in the lampblack channel through a valve plate rotation shaft; a blocking body causing the two valve plates only to be opened towards the direction of the air outlet is arranged at one end near the air inlet in the lampblack channel; a connecting strip lengthways arranged to separate the air inlet to two parts is arranged at the side near the air inlet in the lampblack channel; the valve plate rotation shaft is arranged close to the connecting strip; and the side face of the connecting strip facing to the air outlet is provided with a high-temperature closing device which can enable the valve plates to be forcibly closed. The invention has good lampblack removing effect, can not impede the smoothness of public flues, and can be forcibly closed when temperature of flue gas in the public flues is in a high exigent condition.

Description

technical field [0001] The invention relates to a flue non-return fire damper used in kitchens using public flue flues. Background technique [0002] In kitchens using longitudinal public flue ducts, in order to prevent oily fumes from flowing back into the kitchen, a check valve such as a flue check valve is generally installed between the outlet pipe of the range hood and the public flue duct. device. 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. In the air duct, an openable and closable valve plate is arranged at the air outlet of the oil fume channel, and the valve plate is rotated and installed on the inner wall of the oil fume channel through the horizontally arranged valve plate rotating shaft, and the valve plate rotating shaft is located above the center of the valve plate. When the range hood is not ...

AI Technical Summary

Problems solved by technology

When the range hood is not in use, the valve is in the closed position due to its own gravity, covering the air outlet; when the range hood is in use, the valve is in the open position, and the valve is far away from the air outlet, because the plane where the valve is located when the valve is opened Consistent with the cross-section of the longitudinal public flue, the open valve will hinder the smooth flow of the public flue, especially in the case of a multi-storey residential building sharing a longitudinal public flue, the opened valve of each floor will seriously hinder the flow of the public flue. The smoothness of the public flue gas duct makes the effect of exhausting oil fume worse

At the same time, since many users share a vertical public flue gas passage, once a fire breaks out in one household, a large amount of high-temperature harmful gas will flow into the vertical public flue gas passage. If the valve plate in the flue check valve is not closed in time, These large amounts of high-temperature and harmful gases will enter the homes of users who are using range hoods through the fume passage of the flue check valve, thereby threatening the lives of residents. s method

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