| 摘要 |
1,050,046. Centrifugal separators. PENNSALT CHEMICALS CORPORATION. April 26, 1965 [May 4, 1964], No. 17513/65. Heading B2P [Also in Division F2] In a centrifuge comprising a rotatable vertical hollow rotor 12, Fig. 1 (not shown), enclosing a rotatable helical conveyor 18 for discharging deposited solids from the rotor, a bearing assembly between the rotor and the conveyer comprises a downwardly extending spindle 25, Fig. 2, secured to the lower end of the conveyer 18, a hub portion 30 secured to the lower end of the rotor 12 and having a central axial bore 32 accommodating the spindle, a bushing 40 of resilient plastic material surrounding the spindle and engaging the internal surface of the bore 32, and a sealing element 42 located between the conveyor 18 and the hub portion 30 and urged downwards by springs 52 into sealing relation with the hub. The element 42 consists of a washer which is urged by the springs into running contact with an annular seal 46 of resilient plastic material and which is sealed to the conveyer 18 by an O-ring 58. A similar sealing device 44, 48, 56, 60 is provided between the hub 30 and a collar on the end of the spindle 25. These sealing devices prevent abrasives which may be present in the surrounding atmosphere from penetrating between the bushing 40 and the sleeve 25. The synthetic plastic material for the bushing 40 and the seals 46, 48 may be P.T.F.E. reinforced with a powder or glass filaments. In operation, the bushing 40 is forced by centrifugal force against the hub and rotates therewith and coats the surface of the spindle with a continuous layer of plastic particles which provide the necessary lubrication. Feed is through a tube 22 and an opening 24 in the conveyer. The tube 22 is supported by arms 62 extending inwards from the casing (not shown) surrounding the rotor. The arms 62 also support a damping ring 64. In a modification, Fig. 3 (not shown), the sealing elements 42, 46, 44, 48 are omitted and the hub 30' has a conical bore 32' which receives a conical bushing 32' and a spring- urged bearing cone 70 which is sealed to the conveyor 18' and to the spindle 25' by O-rings 58' and 72 respectively. |
