Importance

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Abstract

A rotary displacement pump (2) according to the present invention is for pumping flowable viscous materials and comprises a liner (26, 36); a rotor (28) configured to be driven by a shaft (8); said rotor (28) including a shaft portion (30) and a radially protruding web (32) having a configuration of an undulatory disk type; a scraper gate (38) having an engagement slot of predetermined radial height and predetermined axial width, said engagement slot engaging said protruding web (32) of said rotor (28); said scraper gate (38) being supported by a scraper gate guide (40) so as to be retained in circumferential direction and to allow a reciprocating movement in a substantially axial direction; a pump housing (14) comprising a front end part (52) and a rear end part, said pump housing (14) enclosing said liner (26, 36), said rotor (28), said scraper gate (38) and said scraper gate guide (40), said shaft (8) extending through said rear end part of said pump housing (14); said liner (26, 36) including a first liner element (26) and a second liner element (36), said first and second liner elements (26, 36) abutting to each other laterally along a radially outer abutment portion so as to form a liner channel through which said radially protruding web (32) of said rotor (28) runs and to define an enclosure that encircles a portion of said radially protruding web (32) of said rotor (28); an inlet chamber and an outlet chamber being defined by said liner (26, 36), said scraper gate (38) and said scraper gate guide (40) or by said liner, said pump housing, said scraper gate and said scraper gate guide; said scraper gate (38) together with said scraper gate guide (40) forming a partition between said inlet chamber and said outlet chamber; said inlet and outlet chambers being provided with respective inlet and outlet ports (16, 18); said liner channel extending from said inlet chamber to said outlet chamber; said web (32) of said rotor (28) being rotatable through said inlet chamber, said liner channel, said outlet chamber and said slot of said scraper gate (38); wherein said scraper gate (38) and/or said liner (26, 36) consists of 85 to 95 Vol-% of a Polyethylene basis material having a high molecular weight of 0.6*10⁶ g/mol to 1.4*10⁶ g/mol, particularly of 0.8*10⁶ g/mol to 1.2*10⁶ g/mol, and more particularly of around 1.0*10⁶ g/mol, and 15 to 5 Vol-% of glass particles having a spherical or oval shape distributed within said Polyethylene basis material, such that the surface of said scraper gate (38) and/or said liner (26, 36) comprising rounded surface portions formed by such glass particles constitutes a hard slide face for the flowable viscous materials to be pumped.

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First Claim