Range hood fire valve

Abstract

Disclosed is a range hood fire valve. The range hood fire valve comprises a housing, in which an oil fume channel is formed; the oil fume channel is provided with an air inlet and an air outlet which are oppositely arranged; the inside of the oil fume channel is provided with a radial mounting shaft and a rotating valve block, wherein the valve block is mounted on the mounting shaft and can open and close the air inlet. The range hood fire valve is characterized in that the mounting shaft is provided with a first torsional spring and a second torsional spring; the first torsional spring acts on the rotating valve block all the time and enables the air inlet to obtain a tendency to being closed; the second torsional spring is provided with a fusing module and acts on the rotating valve block and enables the air inlet to obtain a tendency to being closed only when the fusing module is fused. The range hood fire valve has the advantages that, the internal mounting shaft is provided with the first torsional spring and the second torsional spring, so that when the fusing module is fused, the action forces of the first torsional spring and the second torsional spring are superpositioned and are sufficient to overcome pressure at the air inlet, so that the air inlet can be closed more reliably.

Description

technical field [0001] The invention relates to a fire damper, in particular to a fire damper for range hoods. 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 in the closed position due to...

AI Technical Summary

Problems solved by technology

Although the fire damper can be forcibly closed when the flue gas temperature in the public flue gas duct is in a high emergency state, its structure is relatively complicated, the air outlet area of ​​the channel occupied is large, and the local loss of the air outlet is large. In the case of an emergency, the valve plate is not reliable enough to close the air inlet. In addition, it is inconvenient to replace the fuse of the high-temperature closing device.

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