Dust collection system

Abstract

A dust collection system for portable sanding or grinding equipment employs a cyclone separator mounted directly on the tool or machine, with a dust outlet duct at the narrow lower end of the cyclone, and a cartridge air filter mounted on the top of the cyclone. The filter returns the air flow from the machine to the ambient air in the vicinity of the tool. The dust is concentrated in the cyclone, and a small volume air flow then moves the dust through an elongated flexible hose or duct to a remote dust collection station. An air pump at the remote dust collection station provides sufficient air flow to draw the small volume of air plus entrained dust from the tool-mounted cyclonic separator. A cyclonic separator at the remote station separates this dust from the air flow and deposits it in a collection tank or drum.

1. A dust collection system for collecting production dust from a source machine that generates such dust in a production operation, said source machine having a blower means for picking up said dust and exhausting the dust entrained in a stream of air to an exhaust outlet on the source machine; comprising
 a cyclone separator mounted on said source machine, said cyclone separator including a circular upper inlet portion, an inner tubular baffle coaxial with the upper inlet portion and having open ends, the upper inlet portion and inner baffle defining between them an annular inlet space, a frustoconic portion beneath the upper inlet portion and having a wide end joined to the upper inlet portion and a narrow lower end, a dust outlet duct at said narrow lower end, and inlet duct extending from outside the upper inlet portion into said annular inlet space;  
 air cleaning means above upper inlet portion for cleaning air that passes out through said inner tubular baffle and permitting the air to return into ambient air in the vicinity of said source machine;  
 a first conduit coupled between the exhaust outlet on the source machine and the inlet duct of the cyclone separator; and  
 an elongated flexible duct coupled from said dust outlet duct to a dust collection station positioned remote from said source machine, for conveying a minor flow of air plus dust entrained therein to the dust collection station.  
 
     
     
       2. A dust collection system according to  claim 1  wherein said air cleaning means includes a replaceable air filter removable positioned above said outer cylinder. 
     
     
       3. A dust collection system according to  claim 2  wherein said air filter is in the form of a cylinder mounted coaxially with said cyclone separator. 
     
     
       4. A dust collection system according to  claim 1  wherein said inlet duct penetrates to a region of said annular inlet space that is midway between said upper inlet portion and said inner tubular baffle. 
     
     
       5. A dust collection system according to  claim 1  wherein said first conduit is a rigid hollow member forming means for supporting said cyclone separator on said source machine. 
     
     
       6. A dust collection system according to  claim 1  wherein said inlet portion and said tubular baffle are in the form of coaxial cylinders. 
     
     
       7. A dust collection system according to  claim 3  further comprising a threaded post extending upward at an axial of said tubular baffle and above said cyclone separator, and female threaded means for holding said filter in place on said threaded post. 
     
     
       8. A dust collection system according to  claim 1  wherein said dust collection station includes a second cyclone separator having an inlet port to which said elongated flexible duct is connected, a dust collection drum positioned below a lower end of said second cyclone separator for receiving the dust carried to it through said elongated flexible duct, an  a pump for drawing air through said second cyclone separator, and an air filter interposed between an outlet baffle of said second cyclone separator and said air pump. 
     
     
       9. A dust collection system according to  claim 1  wherein said elongated flexible conduit is a hose of about ¾ inch to one inch in diameter. 
     
     
       10. Portable independent stand- alone cyclonic dust collection station adapted to receive production dust from a dust-creating tool via an elongated flexible conduit that carries off the production dust from said tool to an inlet pipe of the dust collection station; the dust collection station comprising      a. a frustoconic cyclonic separator having a wall that is at least partly conic, said inlet pipe penetrating said wall;        b. a dust collection drum disposed beneath said separator;        c. a fitting connecting a lower nose of said cyclonic separator to said drum and closing off an upper side of said drum;        d. an internal tubular air baffle disposed coaxially within the cyclonic separator and having an exhaust port leading from an upper end of said cyclonic separator;        f. an exhaust conduit extending from said exhaust port of said tubular air baffle;        g. filter means having an inlet pipe connected to said exhaust conduit for catching particles passing out of said exhaust baffle, and having an outlet; and        h. an air pump having an intake connected to the outlet of said filter unit and an exhaust for discharging cleaned, filtered, and dust - free air into the ambient.      
     
     
       11. Portable independent stand- alone cyclonic dust collection station according to    claim 10    in which said filter unit and said air pump are mounted on a wheeled hand truck.    
     
     
       12. Portable independent stand- alone cyclonic dust collection station according to    claim 10    in which said dust collection station is powered by a  110  volt single - phrase motor.    
     
     
       13. Portable independent stand- alone cyclonic dust collection station according to    claim 10    wherein said vacuum drum is provided with a plastic bag liner.    
     
     
       14. Portable independent stand- alone cyclonic dust collection station according to    claim 13    further comprising a vacuum hold - down arrangement which includes a vacuum inlet fitting on said drum, the hold - down arrangement drawing and holding the bag liner to the inside of drum.    
     
     
       15. Portable independent stand- alone cyclonic dust collection station according to    claim 10   , wherein said cyclonic separator has a frustoconic side wall, with said inlet pipe penetrating the frustoconic side wall.