Pressure regulating device for exhaust tube

Abstract

A pressure regulating device includes a housing for attaching to an exhaust tube and having a chamber for receiving an exhaust gas from the exhaust tube, a piston slidably received in the housing, and a spring biasing device for biasing the piston to control the exhaust gas to flow into the housing, the exhaust gas is capable of flowing into the housing when against a spring biasing force of the biasing device applied against the piston. The housing includes a conduit for slidably receiving a piston rod of the piston. The biasing device includes one or more spring members biased against the piston rod and adjustable to different spring biasing force by an adjusting device.

1 . A pressure regulating device for attaching to an exhaust tube, said pressure regulating device comprising: 
 a housing including a base for attaching to the exhaust tube and including a chamber formed therein, and including an inlet formed therein and communicating with said chamber thereof for receiving an exhaust gas from the exhaust tube, and including an outlet formed therein and communicating with said chamber thereof for outward flowing of the exhaust gas,    a piston slidably received in said chamber of said housing, and    means for biasing said piston to control an opening or an enclosing of said inlet of said housing, and to control the exhaust gas to flow into said housing through said inlet of said housing, and to allow the exhaust gas to flow out of said housing through said outlet of said housing,    the exhaust gas being capable of flowing into said chamber of said housing when against a spring biasing force of said biasing means applied against said piston.    
   
   
       2 . The pressure regulating device as claimed in  claim 1 , wherein said housing includes a sealing ring disposed and engaged in said inlet of said housing for engaging with said piston and for controlling the opening or the enclosing of said inlet of said housing.  
   
   
       3 . The pressure regulating device as claimed in  claim 1 , wherein said housing includes a conduit provided and supported in said chamber thereof and having a bore formed therein, and said piston includes a piston rod slidably received in said bore of said conduit.  
   
   
       4 . The pressure regulating device as claimed in  claim 3 , wherein said housing includes a partition provided in said chamber thereof to support said conduit.  
   
   
       5 . The pressure regulating device as claimed in  claim 3 , wherein said housing includes a barrel engaged into said bore of said conduit and engaged between said conduit and said piston rod for allowing said piston rod to smoothly slide relative to said conduit.  
   
   
       6 . The pressure regulating device as claimed in  claim 1 , wherein said piston includes a piston rod extended therefrom, and said biasing means includes a spring member for biasing against said piston rod.  
   
   
       7 . The pressure regulating device as claimed in  claim 6 , wherein said piston includes a casing secured to said piston rod for engaging with said spring member.  
   
   
       8 . The pressure regulating device as claimed in  claim 6 , wherein said biasing means includes at least one second spring member disposed around said spring member for biasing against said piston rod.  
   
   
       9 . The pressure regulating device as claimed in  claim 6  further comprising means for adjusting a spring biasing force of said spring member against said piston rod.  
   
   
       10 . The pressure regulating device as claimed in  claim 9 , wherein said housing includes a cover secured thereon, said adjusting means includes a panel disposed on top of said spring member, and an adjusting member threaded to said cover and engaged with said panel for moving and adjusting said panel against said spring member.  
   
   
       11 . The pressure regulating device as claimed in  claim 10 , wherein said panel includes a center cavity formed therein, and said adjusting member includes a centering tip for engaging with said center cavity of said panel and for centering said panel.  
   
   
       12 . The pressure regulating device as claimed in  claim 11 , wherein said center cavity of said panel is a frustum-shaped cavity for centering purposes.  
   
   
       13 . The pressure regulating device as claimed in  claim 10 , wherein said adjusting member is a threaded member, and a lock nut is threaded to said adjusting member for engaging with said cover and for locking said adjusting member to said cover.  
   
   
       14 . The pressure regulating device as claimed in  claim 9 , wherein said housing includes a cover secured thereon, and a membrane disposed between said cover and said housing for making an air tight seal between said cover and said housing.  
   
   
       15 . The pressure regulating device as claimed in  claim 14 , wherein said membrane includes an outer peripheral portion secured between said cover and said housing and includes an inner portion attached to said piston rod of said piston.  
   
   
       16 . The pressure regulating device as claimed in  claim 14 , wherein said cover includes a compartment formed therein and includes a hose coupled thereto and communicating with said compartment thereof for coupling to a vacuuming source.