Patent ID: 8186687

Claim:
A cartridge seal device for a rotary shaft, comprising: a sleeve for extension of the rotary shaft therethrough, and having inner and outer end portions and an end cap formed on said inner end portion and confining an annular groove around said inner end portion; said end cap of said sleeve has an outer peripheral surface formed with a spiral groove; a gland unit disposed around said sleeve and including a first gland, and a second gland having one end in abutment with said first gland, said first gland having at least one engaging recess that face to said sleeve, said second gland having an axial hole for extension of said sleeve, a fluid chamber in fluid communication with said axial hole, and at least one fluid port communicated with said fluid chamber; said second gland has an annular inner surface in contact with an outer surface of said second stationary ring, said annular inner surface of said second gland having an outwardly slanting end portion proximate to said outer end portion of said sleeve; a first seal unit disposed around said sleeve and connected to said first gland, said first seal unit including a first rotary ring disposed around said sleeve, rotatable along with said sleeve, and inserted into said annular groove, a first stationary ring abutting against said first rotary ring, a compression ring abutting against said first stationary ring, and at least one first spring disposed between said first gland and said compression ring and abutting against said compression ring, said first stationary ring having one end in abutment with said first rotary ring, and an opposite end formed with at least one notch that faces to said compression ring, said compression ring having aligned guide pieces that project from two opposite sides of said compression ring and that extend respectively into said notch of said first stationary ring and said engaging recess of said first gland; a pumping ring disposed around said sleeve within said second gland; a second seal unit disposed around said sleeve and connected to said pumping ring and said second gland, said second seal unit having a second rotary ring connected between said pumping ring and said sleeve, a second stationary ring abutting against said second rotary ring, and at least one second spring disposed between said second gland and said second stationary ring and abutting against said second stationary ring; and a first sealing part disposed inside said annular groove and between said end cap and said first rotary ring, said first sealing part having a first fluid sealing ring and a packing ring made of heat-insulating material in abutment with said first fluid sealing ring.