Mechanical seal assembly with double-sealing properties and low pressure area
AssigneeFSI North America, Inc.
InventorWilliam HAYWOOD
Life of this patent
Estimating the term…
Abstract
A mechanical seal of the cartridge type. A rotary subassembly includes a sleeve, the sleeve packed against and adapted to be in sealing disposition with a pump shaft of a pump. A stationary subassembly is for attachment to a stuffing box of the pump, the stationary subassembly including a gland, the gland having a front face and a back face and a gland lip extending from the back face. A lip seal is disposed within the gland at the back face below the gland lip, wherein the lip seal concurrently seals and acts as a secondary lubricant within the seal. In addition, a scroll is crimped onto said sleeve of the rotary subassembly at the downshaft end thereof, wherein the scroll includes a spirally-arranged, ridged outer surface.
Claims17
A mechanical seal, comprising:
- a rotary subassembly, said rotary subassembly including a sleeve, said sleeve packed against and adapted to be in sealing disposition with a pump shaft of a pump;
- a stationary subassembly for attachment to a stuffing box of said pump, said stationary subassembly including a gland, said gland having a front face and a back face and a gland lip extending from said back face;
- and,
- a lip seal disposed within said gland at said back face below said gland lip, wherein said lip seal concurrently seals and acts as a secondary lubricant within said seal.
A mechanical seal, comprising:
- a rotary subassembly, said rotary subassembly having a downshaft end and an upshaft end, said rotary subassembly packed against and adapted to be in sealing disposition with a pump shaft of a pump;
- a stationary subassembly for attachment to a stuffing box of said pump, said stationary subassembly including a gland;
- and,
- a scroll crimped onto said sleeve of said rotary subassembly at said downshaft end thereof, said scroll creating a low-pressure area upshaft therefrom.
Dependencies are inferred from the claim text.