Cartridge seal assemblies and associated methods
AssigneeBal Seal Engineering, Inc.
InventorsPete Balsells, Farshid Dilmaghanian, Derek Changsrivong
Life of this patent
Estimating the term…
Abstract
The present cartridge seal assemblies pertain to rotary lip-type seals. In certain embodiments, a sealing member is constructed of a relatively hard material that increases the lifespan of the sealing member. The sealing member is energized with a canted-coil spring, which in some embodiments includes an adjustable spring force. The present embodiments enable control of sealing force to achieve an appropriate sealing force between the sealing member and the shaft based on factors such as temperature, pressure, rotary speed, properties of fluid media, etc. to achieve longer seal life.
Claims15
A seal assembly for sealing around a rotatable shaft, the seal assembly comprising:
- a primary seal comprising a first sealing member having an inside flange with a seal lip for sealing against a movable shaft, a first sealing retaining ring engaging the first sealing member and together with the first sealing member defining a spring cavity having a canted coil spring located therein biasing against the seal lip and at least part of the first sealing retaining ring;
- a backing ring having a radial wall supporting a central portion of the first sealing member and having an outside longitudinal extending shelf and an inside longitudinal extending shelf, said inside longitudinal extending shelf supporting the inside flange of the first sealing member;
- and a secondary seal comprising a second sealing member having an inside flange with a seal lip for sealing against a movable shaft, a second sealing retaining ring engaging the second sealing member and together with the second sealing member defining a spring cavity having a second canted coil spring located therein biasing against the seal lip and at least part of the second sealing retaining ring;
- a top of said second sealing retaining ring in contact with the outside longitudinal extending shelf to retain the secondary seal to the backing ring.
A seal assembly for sealing around a rotatable shaft, the seal assembly comprising:
- a primary seal supported by a backing ring and a secondary seal located in a holding space defined by the backing ring and a movable shaft;
- wherein the primary seal comprises a first sealing member having an inside flange with a seal lip for sealing against the movable shaft, a first sealing retaining ring engaging the first sealing member and together with the first sealing member defining a spring cavity having a canted coil spring located therein biasing against the seal lip and at least part of the first sealing retaining ring;
- the backing ring having a radial wall supporting a central portion of the first sealing member and having an outside longitudinal extending shelf and an inside longitudinal extending shelf, said inside longitudinal extending shelf supporting the inside flange of the first sealing member;
- and the secondary seal comprising a second sealing member having an inside flange with a seal lip for sealing against the movable shaft, a second sealing retaining ring engaging the second sealing member and together with the second sealing member defining a spring cavity having a second canted coil spring located therein biasing against the seal lip and at least part of the second sealing retaining ring;
- a top of said second sealing retaining ring in contact with the outside longitudinal extending shelf to retain the secondary seal to the backing ring.
Dependencies are inferred from the claim text.