Abstract: A rotary displacement pump of an undulatory disk type; with a pump housing (24) comprising a front end plate (56) and a rear end plate, the pump housing enclosing a stator (40, 48), a rotor (42), a scraper (44) and a scraper guide (46), a shaft (8) extending through at least the rear end plate; the stator including a generally semi-circular arc-formed first stator member (40) and a generally semi-circular arc-formed second stator member (48), the stator, the pump housing and the scraper together with the scraper guide defining an inlet and outlet chamber, wherein at least part of the end faces of the first and second stator members being situated in the outlet chamber are oblique so as to provide an obtuse-angled transition to the inner faces of the front end plate and the rear end plate.

Abstract: A rotary displacement pump of an undulatory disk type; with a pump housing (24) comprising a front end plate (56) and a rear end plate, the pump housing enclosing a stator (40, 48), a rotor (42), a scraper (44) and a scraper guide (46), a shaft (8) extending through at least the rear end plate; the stator including a generally semi-circular arc-formed first stator member (40) and a generally semi-circular arc-formed second stator member (48), the stator, the pump housing and the scraper together with the scraper guide defining an inlet and outlet chamber, wherein at least part of the end faces of the first and second stator members being situated in the outlet chamber are oblique so as to provide an obtuse-angled transition to the inner faces of the front end plate and the rear end plate.

Abstract: A rotary displacement pump includes a stator (42) fixed in a housing (20), a rotor including a shaft portion (8), a radially protruding web (12), a scraper (110) having an engagement slot (112) engaging the protruding web (12). A guide (92) retains the scraper (110) in a circumferential direction and allows the scraper (110) to move reciprocatingly in a substantially axial direction. The stator (42) includes first and second members that abut each other in abutment areas having a circular arc configuration.

Abstract: A rotary displacement pump includes a stator (42) fixed in a housing (20), a rotor including a shaft portion (8), a radially protruding web (12), a scraper (110) having an engagement slot (112) engaging the protruding web (12). A guide (92) retains the scraper (110) in a circumferential direction and allows the scraper (110) to move reciprocatingly in a substantially axial direction. The scraper includes first, second and third grooves (120, 124 and 127). The grooves are designed so that they accommodate a portion of the guide (92) and allow the reciprocating movement of the scraper (110).

Abstract: The invention a rotary displacement pump including a stator (42) fixed in a housing (20) a rotor including a shaft portion (8) and a radially protruding web (12) having a configuration of an undulatory disk type; a scraper (110) having an engagement slot (112) of predetermined radial height and predetermined axial width, the engagement slot (112) engaging said protruding web (12) of said rotor; a guide (92) retains and scraper (110), configuration of a recessed plate and being—directly or indirectly—fixed in said housing (20), wherein the guide (92) retains said scraper (110) in circumferential direction and allows said scraper (110) a reciprocating movement in substantially axial direction; said scraper (110), including—a first groove (120) having a predetermined depth and extending along its radially outer edge surface,—and a second groove (124) and a third groove each having a predetermined depth and extending in radial direction along one front edge surface and along another front edge surface, respective

Abstract: A rotary displacement pump, comprising: (a) a stator (42); (b) a rotor including a shaft portion (8) and a radially protruding web (12) having a configuration of an undulatory disk type; (c) a scraper (110) having an engagement slot (112) of predetermined radial height and predetermined axial width, the engagement slot (112) engaging said protruding web (12) of said rotor; (d) said stator (42) including a generally cup shaped first member (44) and a generally cup shaped second member (46), and defining a circumferential wall, (e) said scraper (110) being arranged within said stator (42), supported to be retained in circumferential direction and to allow a reciprocating movement in a substantially axial direction; (f) said stator (42) together with said scraper (110) defining -an inlet chamber (138), having an inlet port (68), of said pump (2), -an outlet chamber (142), having an outlet port (70), of said pump (2), -and a channel (140) extending from said inlet chamber (138) to said outlet chamber (142), said