| 摘要 |
The present invention regards a positive displacement rotary gear pump (1) of the reversible type, i.e. one that is able to operate in both rotational directions, with inversion of suction and delivery, without loss of yield. More particularly the pump (1) of the present invention regards a pair of meshing toothed wheels (3,4) comprising shafts (32,42) supported by bushes (9,10) in abutment on the rear cover (8), said rear cover (8) comprising a first chamber (11) placed in fluid communication with a first opening (5) and a second chamber (12) placed in fluid communication with a second opening (6), and a. third chamber (13a,13b) selectively placed in fluid communication alternatively with said first (11) or with said second (12) chamber, said chambers (11,12,13a,13b) being arranged at the abutment surface of said bushes (9,10) against said cover (8), the openings (5,6) alternatively carrying out the function of suction or delivery opening. |
