FIELD: engines and pumps.
SUBSTANCE: pump (1) comprises case (3) with inlet (3a) and revolving impeller (20) with hub (21) and blade (25) arranged inside said case (3), spinning drive shaft (33) coupled with pump (20) and cover plate (2). Plate (2) is arranged between impeller (20) and case rear wall (23). Plate (2) has mid hole (2g) for hub (21) or drive shaft (33) to pass there through. Inner space (37) is composed between cover plate (2) and case (3) rear wall (23). Gap (2b) for fluid communication with inner space (37) is composed between cover plate mid hole (2g) and hub (21). Cover plate (2) has at least one opening (2a) spaced from mid hole (2g) to create fluid flow (F1). Said flow passes through opening (2a) into inner space (37) to exit through gap (2b) from inner space (37).
EFFECT: perfected design.
30 cl, 16 dwg
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