PUMP Russian patent published in 2019 - IPC F04D29/41 F04D29/47 

FIELD: engines and pumps.

SUBSTANCE: invention relates to pump engineering, particularly, to pumps with start / stop devices. Pump comprises impellers forming, with sealing rings, radial clearances δ_I, unloading disc with hub forming with fixed ring (5) installed in pump cover, radial clearance δ_r, sliding bearing including housing, on which cover (8) with ring (9) attached to it is installed. Trunnion of bearing is installed on shaft and made composite along length. First part of the trunnion, which is located on the side of the unloading disc, has smaller diameter than the second part of the trunnion, located on the side of the free end of the shaft and having an end collar. First part (10) of trunnion and first bushing (13) installed on body have radial clearance δ₁. Second journal part (11) having larger diameter and second bushing (14) installed on bearing housing have radial clearance δ₂ and form sliding bearing. Gaps are interrelated by relationships: δ₂<δ₁, a δ₁≈δ_r≈δ_I. Trunnion part (11) on the outer diameter surface has an antifriction coating, and bushing (14) has a hardened surface along the inner diameter with hardness of not less than HRC_E 40. Ring (9) located on lid (8) is made of antifriction material or has antifriction coating. End band (12) of part (11) has a hardened surface with hardness of not less than HRC_E 40. Radial grooves are made on surface of belt (12).

EFFECT: reduced probability of grazing in bearing, increased wear resistance and resource of its parts, possibility of monitoring and diagnostics of bearing and its protection by temperature, increasing wear resistance and resource of the second part of the trunnion and the ring, as well as increasing the efficiency, reliability and service life of the pump as a whole.

6 cl, 4 dwg