초록 ▼

The invention consists of a method and apparatus for very rapid, assembly-line inspection of fluid filters for manufacturing flaws; which, when the filter is in service, would pass particles harmful to the mechanism or device which the filter is designed to protect. A harmless and low-cost particle

The invention consists of a method and apparatus for very rapid, assembly-line inspection of fluid filters for manufacturing flaws; which, when the filter is in service, would pass particles harmful to the mechanism or device which the filter is designed to protect. A harmless and low-cost particle test agent, with a wide range of particle sizes, is blown into the filters. If particles of a size which would be potentionally harmful in service, because of their relatively large size, pass through the filter along with the harmless small particles, they are concentrated in the air stream by a cyclone. The particles and the small remaining stream of air, then enter an acoustic sensor which signals rejection of the filter, because it will signal only the larger, potentially harmful particles.

대표청구항 ▼

A device for testing a filter for flaws, comprising: (a) a reservoir for containing test particles; (b) means for providing a stream of gas to said filter; (c) means for introducing a measured quantity of particles into said stream of gas from said reservoir; (d) means for collecting said gas and sa

A device for testing a filter for flaws, comprising: (a) a reservoir for containing test particles; (b) means for providing a stream of gas to said filter; (c) means for introducing a measured quantity of particles into said stream of gas from said reservoir; (d) means for collecting said gas and said test particles which pass through said filter, said collecting means including a cyclone having a lower exit tube and an upper stack opening greater than the diameter of said exit tube, whereby a large volume of the air which passes through said filter is releaseable through said stack opening, thereby concentrating said test particles in a much smaller air stream releaseable through said exit tube; and (e) acoustical sensor means for detecting the presence of said test particles, said sensor means including a shock wave generator, whereby when said test particles are introduced into said stream of gas, said test particles which pass through said filter are detected by said acoustical sensor means due to the shock wave each particle makes when said particle disturbs the interface between a section of the laminar flow and a section of turbulent flow of said acoustical sensor means.