FRICTION COUPLE AND IMPELLER OF IMMERSED MULTIPLE-IMPELLER CENTRIFUGAL PUMP PROVIDED WITH FRICTION COUPLE Russian patent published in 2003 - IPC

FIELD: mechanical engineering. SUBSTANCE: friction couple is comprised of two parts. At least surface portion of first part facing second part is made from composite material of monolith structure comprising thermosetting polymeric binder and at least one layer of polyester fibrous filler. Surface portion of second part facing first part is made from iron alloy containing free carbon. Pump impeller has guiding apparatus, rotor and at least one antifriction wear-resistant washer made from above composite material. Washer is fixed on one of parts for sliding over second part supporting surface made from iron alloy containing free carbon. Friction couple may be used in friction units adapted for operation under complicated conditions, such as in wear-resistant immersion pumps. EFFECT: reduced friction coefficient, stabilized tribotechnical characteristics of friction couple at increased temperatures and heavy load duty, and prolonged pump impeller service life. 29 cl, 3 dwg