초록 ▼

A modal attenuator may include an attenuator body having a lead-in segment and a lead-out segment joined by a connection segment, a perforated screen disposed within the attenuator body and spaced apart from the attenuator body to form an annular space, and a plurality of rings disposed between the

A modal attenuator may include an attenuator body having a lead-in segment and a lead-out segment joined by a connection segment, a perforated screen disposed within the attenuator body and spaced apart from the attenuator body to form an annular space, and a plurality of rings disposed between the perforated screen and the attenuator body. When fluid flows through the modal attenuator, sound waves pass through the perforated screen and are reflected back by the plurality of rings to disrupt other sound waves, thereby reducing fluid noise in the modal attenuator.

대표청구항 ▼

1. A modal attenuator for reducing noise in a process system having fluid flowing through a pipe, the modal attenuator comprising: an attenuator body having a lead-in segment and a lead-out segment joined by a connection segment;a perforated screen disposed within the attenuator body and spaced apar

1. A modal attenuator for reducing noise in a process system having fluid flowing through a pipe, the modal attenuator comprising: an attenuator body having a lead-in segment and a lead-out segment joined by a connection segment;a perforated screen disposed within the attenuator body and spaced apart from the attenuator body to form an annular space; anda plurality of rings disposed between the perforated screen and the attenuator body, at least two of the rings in the plurality of rings having different annular thicknesses, thereby creating an annular space between the plurality of rings and the perforated screen, the annular space increasing in size from one end of the attenuator body towards a middle of the attenuator body and then decreasing in size from the middle of the attenuator body towards an outlet;wherein sound waves pass through the perforated screen and are reflected back by the plurality of rings to disrupt other sound waves, thereby reducing noise in the modal attenuator. 2. A modal attenuator for reducing noise in a process system having fluid flowing through a pipe, the modal attenuator comprising: an attenuator body having a lead-in segment and a lead-out segment joined by a connection segment;a perforated screen disposed within the attenuator body and spaced apart from the attenuator body to form an annular space; anda plurality of walls disposed on an inner surface of the attenuator body, the walls extending substantially perpendicular to a direction of fluid flow through the attenuator body, and the walls defining a plurality of cavities between the screen body and the attenuator body, the plurality of cavities increasing in volume from an inlet towards the connection segment and decreasing in volume from the connection segment towards an outlet,wherein sound waves pass through the perforated screen and are reflected back by the plurality of cavities to disrupt other sound waves thereby reducing noise in the modal attenuator. 3. The modal attenuator of claim 2, wherein the plurality of cavities approximate a curve when viewed in cross-section. 4. The modal attenuator of claim 2, wherein the attenuator body includes a cone-shaped lead-in segment. 5. The modal attenuator of claim 4, wherein the attenuator body includes a cone-shaped lead-out segment. 6. The modal attenuator of claim 1, wherein the attenuator body includes a first flange at a first end and a second flange at a second end. 7. The modal attenuator of claim 1, wherein the perforated screen includes a plurality of perforations. 8. The modal attenuator of claim 7, wherein at least one perforation in the plurality of perforations is circular in shape. 9. The modal attenuator of claim 1, wherein a spring is disposed between one ring in the plurality of rings and an inlet portion of the attenuator body. 10. The modal attenuator of claim 1, wherein the perforated screen has an inner diameter that is substantially the same as an inner diameter of the attenuator body. 11. The modal attenuator of claim 1, further comprising a perforated plate disposed within the attenuator body, the perforated plate extending substantially perpendicular to a direction of fluid flow through the attenuator body. 12. The modal attenuator of claim 1, wherein a distance between opposite rings corresponds to disruption of a particular frequency of sound wave. 13. A method of reducing noise from fluid flowing through a pipe, the method comprising: arranging a plurality of annular rings within an attenuator body, at least two annular rings in the plurality of annular rings having different annular thicknesses, thereby creating an annular space between the plurality of annular rings and the perforated screen, the annular space increasing in size from one end of an attenuator body towards a middle of the attenuator body and then decreasing in size from the middle of the attenuator body towards an outlet;arranging a perforated screen within the attenuator body, a distance between the perforated screen and an inner surface of the rings in the plurality of rings defining an annular space; andarranging opposing rings in the plurality of rings at a distance that corresponds to disruption of a particular frequency of sound wave. 14. The method of claim 13, further comprising arranging a perforated plate within the attenuator body, the perforated plate extending substantially perpendicular to a direction of fluid flow through the attenuator body. 15. The method of claim 14, further comprising coating the perforated plate with a first sound absorbing coating. 16. The method of claim 15, further comprising coating the perforated plate with a second sound absorbing coating.