Seal housing with helical element

Abstract

A cavity in the housing, which confines the seal therewithin, has an annular wall surface which is modified to direct liquid from the cavity towards the impeller. In one embodiment, the wall surface has a helical land formed therein. In another embodiment, a helical-land forming insert is set within the cavity and in engagement with the wall surface.

I claim: 
     
       1. An improved housing for a pump which comprises a driving motor (1), a hydraulic part (2) with a rotary impeller (3) connected to the motor (1) by a shaft (4) and a seal housing (5) located between the motor (1) and the hydraulic part (2), the housing (5) contains a cavity (6) adjacent the impeller (3), within said cavity (6) and around the shaft (4) is a mechanical seal having a stationary sealing element (9), a rotary. .,.!. sealing element (8), and a compression spring (10) urging the elements (8), (9) into engagement, wherein the improvement comprises: said cavity (6) having a conical shape and an . .annual.!. .Iadd.annular .Iaddend.wall surface (12), and a . .single.!. helical element .Iadd.(11), .Iaddend.(13) . .is positioned in said cavity (6).!. spaced from said mechanical seal and . .engaging.!. .Iadd.extending .Iaddend.from top to bottom of said wall surface (12), whereby a liquid present near said wall surface (12) is directed toward said impeller (3) due to rotary motion that the liquid obtains when the shaft (4), .Iadd.rotary .Iaddend.element (8) and spring (10) rotate. .Iadd.   
     
     
       2.  The improved housing for a pump according to claim 1, wherein said helical element is a helical land (11) formed in said annular wall surface (12) of said cavity (6). .Iaddend..Iadd.3. The improved housing for a pump according to claim 1, wherein said helical element is a helical insert (13) positioned in said cavity, said helical insert engaging said annular wall surface (12) from said top to said bottom thereof. .Iaddend.