Importance

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Abstract

A pump device (1) is provided comprising: a shaft (2), rotor means (3a, 3b) fixed to said shaft (2) in rotational direction, said rotor means (3a, 3b) having pressure chambers (5a, 5b) the volume of which varying during a rotation of said rotor means (3a, 3b), port plate means (15a, 15b) having a through going opening (16a, 16b) for each of said pressure chambers (5a, 5b) and being connected to said rotor means (3a, 3b) in rotational direction, and valve plate means (17a, 17b) cooperating with said port plate means (15a, 15b). It is intended to pressurize a high volume of fluid, in particular water, within a limited space. To this end said rotor means (3a, 3b) comprise a first rotor (3a) and at least a second rotor (3b), both rotors being fixed to said shaft (2) in rotational direction, said first rotor (3a) having at least a first pressure chamber (5a) and said second rotor (3b) having at least a second pressure chamber (5b), said port plate means (15a, 15b) having a first port plate (15a) and at least a second port plate (15b), said first port plate (15a) having a through going opening (16a) for said first pressure chamber (5a) and being connected to said first rotor (3a) in rotational direction, said second port plate (15b) having a through going opening (16b) for said second pressure chamber (5b) and being connected to said second rotor (3b) in rotational direction, said valve plate means (17a, 17b) having a first valve plate (17a) and at least a second valve plate (17b), said first valve plate (17a) cooperating with said first port plate (15a), and said second valve plate (17b) cooperating with said second port plate (15b), wherein at least one of said first rotor (3a) and said second rotor (3b) comprises force generating means (19) pressing said second port plate (15b) against said second valve plate (17b) even in absence of hydraulic pressure in said second pressure chamber (5b).

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First Claim