| 摘要 |
An improved cartridge-type bearing seal[10] includes removably connected stator and rotor sections [12, 14]. The stator section [12] supports a distribution ring [15] that divides an internal annular volume [36] into radially outside [36a] and inside portions [36b]. The ring [15] has a sufficient number of tangentially oriented ducts [17] to permit fluid communication between the outside [36a] and inside [36b] portions. With this structure, when pressurized purge fluid is supplied to the outside portion [36a], the fluid flows through the ducts [17], to induce a desired tangential fluid flow within the inside portion [36b]. This in turn causes circumferentially uniform fluid pressure in the annular volume [36] that resides between the rotating shaft [18] and the end cap [32] of the bearing housing, and the pressurized fluid traverses a flow path out of the bearing. This circumferentially uniform fluid pressure, by itself or in combination with a flexible lip [44], prevents contaminant ingress between the rotating shaft [18] and the end cap [32] of the bearing housing. Because the structure [15, 17] that creates the tangential fluid flow is part of the removable cartridge [12, 14], this bearing seal eliminates the need to machine or drill a tangentially oriented passage in the bearing housing. One embodiment adds a secondary ring [51] adjacent the distribution ring [15], to reduce the need to precision machine the inside dimension of the bearing cap. These structural components render the circumferential purge fluid feature even more readily available, for a wider range of spindles. |
