FIELD: cutting tools.
SUBSTANCE: group of inventions relates to a cutting disc, a cutting wheel with such a cutting disc and a cutting unit with such a cutting wheel, which, in particular, can be used in pumps for pumping liquid containing solid substance, namely in pumps-grinders. Cutting wheel comprises shaft section, which is configured to interact with central hole of said cutting disc, hub portion, which is connected to shaft section, and at least two main cutting blades, which in radial direction extend outward from said hub section and which are configured to interact with set of cutting holes of said cutting disc. At that, shaft section contains axially continuing cutting recess, and hub section contains only one radially continuing cutting recess. Cutting disc comprises suction side, central hole, which is made with possibility of interaction with shaft section of said cutting wheel, and set of cutting holes, which open in said suction side radially outward of central opening and are configured to interact with main cutting blades of said cutting wheel. Note here that central hole comprises two axially extending cutting recesses. Two axially continued cutting recesses of the central hole are located diametrically opposite to each other.
EFFECT: claimed invention prevents the solid substance plugging of the gap located between the section of the cutting wheel shaft and the central hole of the cutting disc.
17 cl, 7 dwg
