Silencer plate, exhaust system

Abstract

To reduce noise with an inexpensive and simple structure while suppressing decrease in output of an engine.SOLUTION: A sound-absorbing plate (20) is installed inside a pipe through which gas flows. The sound-absorbing plate has a convex surface-shaped flow dividing part (21) protruding toward an upstream side in a gas flow direction, and a side edge part (22) that faces an inner peripheral surface of the pipe with a path for gas therebetween. The side edge part is open so that the gas can pass behind the flow dividing part in a side view.SELECTED DRAWING: Figure 2

Claims

1. A sound-absorbing plate installed inside a pipe through which gas flows, A convex-shaped diversion section protruding upstream in the direction of gas flow, It has a side edge portion facing the inner circumferential surface of the piping, leaving a passage for the gas, In a side view, the side edge is shaped to allow gas to pass through to the back of the flow divider. The downstream side of the gas flow direction from the aforementioned diversion section is open. The aforementioned flow divider consists of a first convex flow divider that protrudes upstream in the gas flow direction on one side in the height direction and one side in the width direction, and a second convex flow divider that protrudes upstream in the gas flow direction on the other side in the height direction and the other side in the width direction. The sound-absorbing plate is characterized in that the side edges consist of a first side edge facing the inner surface of the pipe, leaving a gas passage on one side in the height direction and one side in the width direction, and a second side edge facing the inner surface of the pipe, leaving a gas passage on the other side in the height direction and the other side in the width direction.

2. A sound-absorbing plate installed inside a pipe through which gas flows, A convex-shaped diversion section protruding upstream in the direction of gas flow, It has a side edge portion facing the inner circumferential surface of the piping, leaving a passage for the gas, In a side view, the side edge is shaped to allow gas to pass through to the back of the flow divider. The downstream side of the gas flow direction from the aforementioned diversion section is open. The aforementioned flow divider consists of a first convex flow divider that protrudes upstream in the gas flow direction on one side in the width direction and one side in the gas flow direction, and a second convex flow divider that protrudes upstream in the gas flow direction on the other side in the width direction and the other side in the gas flow direction. The sound-absorbing plate is characterized in that the side edges consist of a first side edge that faces the inner surface of the pipe, leaving a gas passage on one side in the width direction and one side in the gas flow direction, and a second side edge that faces the inner surface of the pipe, leaving a gas passage on the other side in the width direction and the other side in the gas flow direction.

3. The sound-absorbing plate according to claim 1, characterized in that the first flow-dividing portion and the first side edge portion are formed by bending one side in the width direction of a single plate to one side in the height direction, and the second flow-dividing portion and the second side edge portion are formed by bending the other side in the width direction of the single plate to the other side in the height direction.

4. The inner cylinder, which serves as the piping through which exhaust gas from the engine flows, An outer cylinder that covers the inner cylinder from the radially outer side to form a sound-dampening chamber, A sound-dampening plate according to any one of claims 1 to 3, comprising An exhaust device characterized in that the outer surface of the inner cylinder has punching holes, and the sound-dampening plate is installed inside the inner cylinder.

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