FIELD: engines and pumps.
SUBSTANCE: board (2) has front and rear sides. Said front side a partial surface shaped preferably to truncated cone to match the impeller rear side. Said partial surface has central bore (2g) extending in direction of rotational axes. Closing board (2) has at least one opening (2a) located in the partial surface area and spaced from said central bore (2g). Said opening (2a) makes the joint to direct the fluid between the closing board (2) front and rear sides. Partial surface has helically extending recess (2d). Deepening (2d) spaced from said central bore (2g) and gets along the partial surface and then splays out.
EFFECT: ruled out accumulation of foul, decreased wear and servicing costs.
14 cl, 12 dwg
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