| 摘要 |
A rotary displacement pump, comprising: (a) a housing (20); (b) a stator (42) fixed in said housing (20); (c) a rotor including a shaft portion (8) and a radially protruding web (12) having a configuration of an undulatory disk type; (d) 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; (e) a guide (92) of said scraper (110), the guide (92) generally having a 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; (f) said scraper (110), in addition it said engagement slot (112), 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, respectively, of said scraper (110),
said three grooves (120, 124) being designed such that they accommodate a portion of said guide (92) and allow said reciprocating movement of said scraper (110) in said substantially axial direction; (g) and said housing (20) together with said stator (42) and 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 scraper (110) forming a partition between said inlet chamber (138) and said outlet chamber (142), and said web (12) of said rotor being rotatable through said inlet chamber (138), said channel, said outlet chamber (142) and said engagement slot (112) of said scraper (110). |
