FIRE DAMPER FOR DOUBLE PIPE

Japanese Patent JP3443772

B2

PROBLEM TO BE SOLVED: To provide a fire damper for double pipe which uses a small number of parts, has a simplified structure, and can surely dissolve actuation instability.
SOLUTION: This fire damper is provided with an outer pipe 1, an inner pipe 2, and a projecting section 22 which is provided at the center of the inner pipe 2 in the axial direction and protruded to the inner peripheral surface of the outer pipe 1. The damper is also provided with an expanded section 12 which is installed to the outer pipe 1 so that at least the cross-sectional area of an outer ventilation path 11 may be maintained at the position corresponding to the projecting section 22, a damper pipe 13 which slides on the inner peripheral surface of the outer pipe 1 in the axial direction and, when the end edge of the pipe 13 comes into contact with the projecting section 22, closes the ventilation path 11, and a damper plate 51 which is provided in the inner pipe 2 and closes an inner ventilation path 21 when the plate 51 is rotated by the urging force of a spring 52. In addition, the damper is also provided with a temperature fuse body 3 which is provided through the inner pipe 2, has temperature sensing sections in the ventilation paths 11 and 21, and functions when either one of the sensing section senses a set temperature or higher and a cam mechanism 4 which simultaneously closes the paths 11 and 21 with the damper plate 51 and damper pipe 13 by releasing the urging force accumulated in the spring 52 when the fuse body 3 functions.

Bunichiro Masuda
Takeshi Hamada
Masaki Sakakura

JP2000169797A

September 08, 2003

April 28, 2000

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Ichibunki Engineering Co., Ltd.
Funen Across Co., Ltd.

A62C2/12; A62C3/00; F24F13/14; (IPC1-7): F24F13/14; A62C2/12; A62C3/00

JP200014819A
JP5976255U
JP6283130U
JP1126262U

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