초록 ▼

An improved cylindrical two-stage air cleaner in which the overall efficiency of the cleaner is improved by changing the configuration of filtering means therein from a cylindrical one to a conical one, and in which improved structure is included for sealing the cleaner to prevent passage of incomin

An improved cylindrical two-stage air cleaner in which the overall efficiency of the cleaner is improved by changing the configuration of filtering means therein from a cylindrical one to a conical one, and in which improved structure is included for sealing the cleaner to prevent passage of incoming air to the outlet without being cleaned, and to automatically scrape particulate matter from the inside of the cleaner housing each time a principal filter is changed.

대표청구항 ▼

A two-stage air cleaner for removing solid particles from a stream of air passing therethrough, comprising: (a) a housing generally cylindrical about an axis extending between first and second closed ends thereof, the first end having an annular inward step, a lateral inlet opening near the first en

A two-stage air cleaner for removing solid particles from a stream of air passing therethrough, comprising: (a) a housing generally cylindrical about an axis extending between first and second closed ends thereof, the first end having an annular inward step, a lateral inlet opening near the first end, an axial outlet opening of less diameter than said housing in the first end, and particle collecting means at the second end; (b) filtering means in said housng including a hollow body having the shape of a frustum of a circular cone with a larger end directed toward said outlet opening, and of generally the same diameter as said housing, and a smaller end directed away from said outlet opening, said body being of porous paper pleated in alignment with lines defined on said frustum by planes passing through the axis thereof, so that the pleats are more open at said larger end than at said smaller end; (c) means supporting said filtering means axially in said housing with said larger end surrounding said outlet opening, so that the space between said housing and said filtering means is greater near said second end of said housing than near said first end thereof, including means closing the smaller end of said body and means urging said body toward said first end of the housing; (d) sealing means, including resilient means between said larger end of said body and said first end of said housing, for preventing passage of air through said housing from said inlet opening to said outlet opening except through said filtering means, the sealing means further comprising a resilient annulus connected to the larger end of said filtering means and having first and second portions severally engaging the first end of said housing and said step; (e) means for imparting to air entering said cleaner at said inlet opening a vortical component of motion around said filtering means and toward said collecting means; (f) and means for preventing direct impingement of said entering air on said more open pleats, comprising an impervious baffle encircling the filtering means and extending axially from said first end to a point intermediate the filtering means; (g) all whereby to simultaneously maximize the available size of said outlet opening, so as to reduce the pressure drop in said cleaner, and to maximize the volume of space contained between said housing and said filtering means at the ends thereof remote from said outlet aperture, to optimize reception of particulate matter in said collecting means. A method of preventing contamination of a safety filter in the housing of a two-stage air cleaner having a principal filter surrounding the safety filter which includes sealing means engageable with the inner surface of the housing, the method comprising the step of axially scraping the inner surface of the housing with said sealing means, and axially displacing the matter so removed from said inner surface as an incident to removal of the principal filter.