GB624384A - Arrangement of labyrinth packing for a rotary type of fluid-pressure apparatus - Google Patents

Abstract

624,384. Labyrinth packing; leakage-preventing devices. ARMSTRONG SIDDELEY MOTORS, Ltd., CLARK, T., and ATKINS, J. H. C. Dec. 9, 1946, No. 36282. '[Classes 110(i), 110(iii) and 122(v)] In a labyrinth packing for a rotary type of fluid-pressure apparatus particularly intended to operate at high linear speeds in which a series of axially spaced annular discs interact between the stator and a ring to provide a tortuous passage for pressure fluid, the ring is rigidly supported from the rotor by a pair of separate supporting discs fast with the rotor and secured to the ring, at least one of the supporting discs being conical and disposed concavely to the other. The packing comprises a series of discs 17 carried by a stator ring 18 and secured by rivets 19. The inner peripheries of the discs co-operate without contact with the stepped surface 20 of a ring 21 carried from the rotor 11 by a pair of supporting discs 23, 24. The latter are preferably of high tensile steel and are shrunk on a drum 25 of high thermal expansion steel bolted to the rotor. Driving dogs 27 are disposed between the supporting discs, and the disc 23 has additional driving dogs 28 intermeshing with driving dogs 29 on the rotor blade supports 12. The pressure fluid acting against the inner supporting disc 23 will serve to balance the axial thrust on the rotor blades. The discs 17 may alternatively be secured to the ring 21, or some of the discs may be secured to the stator ring 18 and the others to the ring 21. Specification 608,978 is referred to.