FACE SEAL STRUCTURE

摘要

1,271,143. Reciprocating pumps. E-C CORP. April 28, 1969 [Nov. 6, 1968], No. 21572/69. Heading F1A. A device for raising the pressure of a lowpressure first liquid by a high-pressure second liquid, e. g. process liquids from an exchange crystallization sea-water desalination process, comprises a rotor 10, e. g. driven by an electric motor, and a stator 32 with liquid connections 55, 76 and 64, 79 which sequentially register with rotor bores 16, 18 containing ball pistons 28, 30, sealing between the rotor and stator being effected by plates 60, 86 formed with arcuate ports and located by the stator and provided with sealing elements engaging the rotor and stator, the sealing elements defining areas exposed to pressure which are related, as claimed, to provide a biasing force on the plates. Low-pressure liquid is supplied at connection 55 and high pressure liquid at connection 79, connection 76 being connected to atmosphere and connection 64 to a pressure storage means. In the position shown, piston 28 is moved to the left by incoming low-pressure liquid. On rotation of the rotor, when bore 16 communicates with connections 79 and 64, high-pressure liquid from connection 79 moves piston 28 to the right and discharges the liquid at increased pressure through connection 64. Plates 12 and 14 are secured to the rotor and provide the rotor surfaces engaged by the seals on plates 60 and 86. The sealing element 102, Fig. 7, on the rotor side of each plate 60, 86 comprises a thin sheet of high shear strength and low coefficient of friction, e.g. polyamide resin impregnated with graphite, and is bonded to the plate 60, 86 by adhesive. Alternatively, the plate may be made of the same material as, and formed integrally with, the seal element. The element is located by plate ribs 100, 103. The other side of each plate has O-ring seals 110, 114 and 118 around the plate periphery, central aperture 90 and high-pressure port 92, respectively. The seal 118 also encloses parts of the lands between the arcuate ports in the plate so that the hydraulic pressure at port 92 acts over a larger area to produce a small resultant force acting to continuously bias each plate 60, 86 against the rotor even when bores 16 and 18 are traversing the lands between the plate ports.