Flue fire damper for range hood

Abstract

A flue fire damper for a range hood comprises a fire damper bottom plate and a fire damper body. A fire damper piece is arranged on the fire damper body. The flue fire damper is characterized in that the fire damper body is provided with a first support and a second support, an elastic piece is arranged on the first support, and a deformation piece capable of generating corresponding deformation along with the temperature change is arranged on the second support; a forced closing rod is arranged between the first support and the second support, the first end of the forced closing rod is arranged on the first support, and under the state that the deformation piece does not deform, the second end of the forced closing rod is blocked through the deformation piece and limited on the second support; and under the state that the deformation piece deforms due to temperature rising, the forced closing rod disengages from the deformation piece and the second support, and the fire damper piece is forced to be closed through the elastic piece. The fire damper is simple in structure and stable and reliable in work. After a flue joint outer cover is arranged, the situation of flue blockage can be effectively reduced.

Description

technical field [0001] The invention relates to a fire damper, in particular to a flue fire damper for a range hood. 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 ...

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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