Patent ID: 9291104
Filing Date: 2016-03-22
CPC Classification: F01D,F02C,F23M,F23R,G10K

Claim Text:
1. A damping device comprising: a pipe having an outer peripheral portion, the outer peripheral portion defining a flow passage through which fluid flows and being provided with a plurality of through holes; a fluid introducing unit including a ring shaped structure so as to cover at least a part of the outer peripheral portion of the pipe so that a fluid introduction space introduces therein the fluid from the flow passage via the plurality of through holes and is defined between the fluid introducing unit and the at least part of the outer peripheral portion of the pipe; a branch pipe connected to the fluid introducing unit, the branch pipe defining a communication passage in communication with the fluid introduction space; an acoustic box having a hollow box shape and being connected to the fluid introduction unit via the branch pipe, wherein the acoustic box comprising: a right-side acoustic box defining a right-side resonance space in communication with the communication passage, the right-side acoustic box including a first right-side portion extending toward a right side with respect to a longitudinal direction of the pipe and a second right-side portion being in continuation from the first right-side portion; a left-side acoustic box defining a left-side resonance space in communication with the communication passage, the left-side acoustic box including a first left-side portion extending toward a left side with respect to the longitudinal direction of the pipe and a second left-side portion being in continuation from the first left-side portion; a plurality of right-side partition plates provided in the second right-side portion, for partitioning the right-side resonance space so as to define a right-side resonance duct having a predetermined length in accordance with combustion frequencies; and a plurality of left-side partition plates provided in the second left-side portion, for partitioning the left-side resonance space so as to define a left-side resonance duct having a predetermined length in accordance with combustion frequencies, and wherein each of the second right-side portion and the second left-side portion is separated from the fluid introducing units, wherein an uppermost portion of the first right-side portion is in contact with an uppermost portion of the first left-side portion to form a peak portion along the pipe, wherein each of the right-side acoustic box and the left-side acoustic box has an L-shape to be along circumferential direction of the pipe, the L-shapes being configured by the first right-side portion and the second right-side portion and by the first left-side portion and the second left-side portion respectively, wherein each of the second right-side portion and the second left-side portion extend in a vertical direction and face opposite sides of the pipe, wherein the second right-side portion is spaced apart from a right-side of the pipe and parallel to the circumferential direction of the pipe, and wherein the second left-side portion is spaced apart from a left-side of the pipe and parallel to the circumferential direction of the pipe.