Multistage air cleaner including pulse cleaning system

Abstract

A V-pack filter includes a frame construction having a first frame structure and a second frame structure. The V-pack filter also includes first and second panel sections mounted in extension between the first and second frame structures. The first panel section has first and second ends. The second panel section has third and fourth ends. The first and third ends have a first distance therebetween while the second and fourth ends have a second distance therebetween. The second distance is generally greater than the first distance. The first and second panel sections and the second frame structure define an air flow aperture. A seal arrangement circumscribes the air flow aperture and projects outwardly from the second frame structure. The first frame structure defines a first receiver indent. Assemblies and methods are also included.

1 - 20 . (canceled)  
   
   
       21 . A filter comprising: 
 (a) a frame construction including a first frame structure and a second frame structure retaining a filtration media;    (b) first and second panel sections mounted in extension between said first and second frame structures; 
 (i) said first panel section having first and second ends, and said second panel section having third and fourth ends; 
 (A) said first and third ends having a first distance therebetween;  
 (B) said second and fourth ends having a second distance therebetween, said second distance being greater than said first distance;  
 
 (ii) said first and second panel sections and said second frame structure defining an air flow aperture;  
   (c) a seal arrangement circumscribing said air flow aperture and projecting outwardly from said second frame structure; and    (d) a stop arrangement projecting outwardly from said second end.    
   
   
       22 . A filter assembly comprising: 
 (a) a housing defining a first chamber and a second chamber;    (b) a first stage air cleaner positioned in the first chamber; 
 (i) said first stage air cleaner including at least one filter according to  claim 21  through which air to be filtered is directed during use;  
   (c) a second stage air cleaner positioned in the second chamber; 
 (i) the second stage air cleaner including at least one removable and replaceable filter through which air is directed, during use; and  
   (d) a pulse jet cleaning arrangement constructed and arranged to selectively direct a pulse jet of air, in a reverse direction, through said at least one filter during use.    
   
   
       23 . A method of operating an engine air intake filter assembly having a pulse jet cleaning arrangement constructed and arranged to selectively direct pulses of air through an air filter arrangement, the method comprising: 
 (a) measuring a pressure drop across the air filter arrangement;    (b) measuring an engine load during an engine operation; and    (c) activating a pulse valve of the pulse jet cleaning arrangement to direct a pulse of air, in a reverse direction, through the air filter arrangement in response to the engine load being below a predetermined engine load and the pressure drop exceeding a predetermined pressure drop.    
   
   
       24 . A system for operating an engine air intake filter assembly having a pulse jet cleaning arrangement constructed and arranged to selectively direct pulses of air through an air filter arrangement, the system comprising: 
 (a) a pressure drop component that receives a measured pressure drop across the air filter arrangement;    (b) an engine load component that receives a measured engine load during an engine operation; and    (c) a pulse firing component that activates a pulse valve of the pulse jet cleaning arrangement to direct a pulse of air, in a reverse direction, through the air filter arrangement in response to the engine load being below a predetermined engine load and the pressure drop exceeding a predetermined pressure drop.