Patent ID: 9115632
Filing Date: 2015-08-25
Classification: F01N,Y10T

Abstract:
1. An exhaust stack pipe, comprising: a stack pipe including an upper end and lateral openings adjacent the upper end, a curved cover pipe of greater diameter than the stack pipe overlying the lateral openings and shaped to prevent rain from falling directly onto the upper end of the stack pipe, a heat shield surrounding the stack pipe over at least the majority of its circumference, wherein the cover pipe is formed of the same diameter as such a heat shield, a flow diverter of lesser diameter than the cover pipe mounted within the cover pipe to overlie the end of the stack pipe, the flow diverter comprising an extension tube for mounting onto the end of the stack having lateral openings in the extension tube which are downwardly tapering cutouts, a tapering deflector extending into the stack pipe to divert exhaust gases to flow into the cover pipe through the lateral openings in the stack pipe, the tapering deflector a straight-sided cone of circular cross section, a baffle plate extending between the proximal end of the cover pipe and the exhaust stack pipe to ensure that exhaust gases are discharged only from the distal end of the cover pipe, wherein drainage holes are provided in the baffle plate for any water that collects on the inner surface of the cover pipe, a tray to cover the upper end of the deflector and drainage spouts provided around the circumference of the tray to allow water falling on the tray to drip onto the baffle plate, and a flow restrictor provided within the exhaust stack upstream of the cover pipe to act as a venturi, wherein drainage holes are formed in the exhaust stack pipe around the flow restrictor.