Mechanical seal device

Abstract

A primary technical goal of a mechanical seal device of the present invention is to decrease assembly cost thereof as well as machining cost thereof and to prevent wear of seal surfaces by preventing occurrence of squealing noises of the seal surfaces. The mechanical seal device comprises a first seal ring which is one of a pair of seal rings and disposes an engagement portion at the outer circumferential surface, a retainer ring which has a first support portion supporting an inner diameter surface of the first seal ring and a second support portion engaging the engagement portion and is fixed with either a seal housing or a shaft, and a gasket which joins the retainer ring and the first seal ring in a sealing manner, wherein an engagement clearance (C) formed in a rotational direction between the engagement portion and the second support portion is within 0.5 mm.

1 . A mechanical seal device for providing a seal between a bore disposed in a seal housing and a shaft extending through said bore by means of a pair of seal rings, said mechanical seal device comprising: 
 a) a first seal ring being one of a pair of said seal rings and disposing an engagement portion at the outer circumferential surface;    b) a retainer ring having a first support portion and a second support portion and being fixed with either said seal housing or said shaft, said first support portion supporting said first seal ring, said second support portion engaging said engagement portion to be locked with each other in a rotational direction; and    c) a gasket being made of a rubber-like elastic material and being disposed between said first support portion of said retainer ring and said first seal ring and joining said first support portion and said first seal ring, said gasket being in a fixed contact relation with said first support portion and said first seal ring,    wherein an engagement clearance (C) formed in a rotational direction between an engagement end portion of said second support portion and an engagement wall of said engagement portion is within 0.5 mm.    
   
   
       2 . A mechanical seal device as claimed in  claim 1  wherein said engagement portion is arranged to be an axially extending engagement slot and said second support portion are arranged to be a cantilever beam which is inserted into said engagement portion.  
   
   
       3 . A mechanical seal device as claimed in  claim 2  wherein a bottom surface of said engagement portion is in contact with the inner circumferential surface of said second support portion with a dimensional interference between said second support portion and said bottom surface, wherein said dimensional interference is in a range of from 0 to 0.25 mm.  
   
   
       4 . A mechanical seal device as claimed in  claim 1  wherein a plurality of said engagement portions of said first seal ring engage a plurality of said second support portion of said retainer ring along the circumferential surface, wherein said second support portion and said bottom surface of said engagement portion are arranged in non-contact state with each other.  
   
   
       5 . A mechanical seal device as claimed in  claim 1  wherein said second support portions are disposed in an outer ring and cantilever beams formed in said outer ring by slitting in the axial direction are bent towards radially inward direction of said engagement portions, said outer ring surrounding said first seal ring.