초록 ▼

A hydraulic noise attenuator of the type utilizing a tubular casing having an inlet and outlet end, a perforated tube extending through the casing, the ends of the tube being secured in the inlet and outlet ends of the casing, portions of the tube adjacent at least the secured outlet end thereof, be

A hydraulic noise attenuator of the type utilizing a tubular casing having an inlet and outlet end, a perforated tube extending through the casing, the ends of the tube being secured in the inlet and outlet ends of the casing, portions of the tube adjacent at least the secured outlet end thereof, being encompassed by sound-absorbing material means being provided to reflect sound waves against the sound-absorbing material to enhance the attenuation at the lower frequencies.

대표청구항 ▼

A hydraulic noise attenuator comprising an outer pressure-resistant casing having an inlet and an outlet at opposite ends, a tube extending within the casing between the inlet and the outlet of the casing and defining a flow path for hydraulic liquid, said tube including a central portion formed wit

A hydraulic noise attenuator comprising an outer pressure-resistant casing having an inlet and an outlet at opposite ends, a tube extending within the casing between the inlet and the outlet of the casing and defining a flow path for hydraulic liquid, said tube including a central portion formed with holes communicating the interior of said tube with said casing and an imperforate portion adjacent one end of said tube, said imperforate portion of said tube being covered by a layer of sound-absorbing material terminating short of said central portion, and sound-reflecting surface means in said casing surrounding said one end of said tube, said surface means being positioned to reflect sound onto said layer.