Rotary displacement pump for pumping solids emulsions, especially liquid explosives

A rotary displacement pump (2) for pumping solids emulsions, especially liquid explosives, said rotary displacement pump comprising:

• a stator (40, 48);
• a rotor (42) configured to be driven by a shaft (8),
• said rotor (42) including a shaft portion and a radially protruding web having a configuration of an undulatory disk type;
• a scraper (44) having an engagement slot (96) of predetermined radial height and predetermined axial width, said engagement slot (96) engaging said protruding web of said rotor (42);
• said scraper (44) being supported by a scraper guide (46) so as to be retained in circumferential direction and to allow a reciprocating movement in a substantially axial direction;
• a pump housing (24) comprising a front end plate (56) with an inner face and a rear end plate (57) with an inner face, said pump housing (24) enclosing said stator (40, 48), said rotor (42), said scraper (44) and said scraper guide (46);
• said stator (40, 48) including a generally semi-circular arc-formed first stator member (40) and a generally semi-circular arc-formed second stator member (48), said first and second stator members (40, 48) having upper end faces (80, 82, 84) abutting to each other laterally along a radially outer abutment portion (74) so as to form a stator channel through which said radially protruding web of said rotor (40, 48) runs and to define an enclosure (68, 70) that encircles a generally semi-circular arc-formed portion of said radially protruding web of said rotor (42);
• said stator (40, 48), said pump housing (24) and said scraper (44) together with said scraper guide (46) defining an inlet chamber and an outlet chamber,
• said scraper (44) together with said scraper guide (46) forming a partition between said inlet chamber and said outlet chamber,
• said inlet and outlet chambers being provided with respective inlet and outlet ports (26, 30);
• said stator channel extending from said inlet chamber to said outlet chamber,
• said web of said rotor (42) being rotatable through said inlet chamber, said stator channel, said outlet chamber and said slot (96) of said scraper (44), wherein at least part of said end faces of said first and second stator members (40, 48) being situated in said outlet chamber are oblique,
• said end faces of said first and second stator members (40, 48) in said outlet chamber providing an obtuse-angled transition to said inner faces of said front end plate (56) and said rear end plate (57),
• wherein said shaft (8) extends through both said front and rear end plates (56, 57), and wherein generally tube-shaped front and rear seal housing elements (36, 50) are positioned in the central recesses of said first and second stator members (40,48);
• and
• wherein front and rear shaft sleeves (38, 52) attach to said rotor (42), wherein said front and rear shaft sleeves (38, 52) are situated within said seal housing elements (36, 50), and wherein sealing elements are provided between said rotating front and rear shaft sleeves (38, 52) and said stationary seal housing elements (36, 50).