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公开(公告)号：EP2591210A2
公开(公告)日：2013-05-15
申请号：EP11748463.4
申请日：2011-07-07
申请人： VHIT S.p.A.
发明人： LEIFERT, Volker , STAGNOLI, Luca , CROTTI, Antonio
IPC分类号： F01C21/08 , F04C18/344
CPC分类号： F04C18/3442 , F01C19/005 , F01C21/0872 , F01C21/0881 , F04C27/001 , F04C2220/10 , F04C2240/20
摘要： A pump (1) has a rotor (5) eccentrically rotating within a pumping chamber (20) and a slot (6) housing a pair of vanes (7A, 7B; 70; 71; 72) with a hook-like outline, which are radially slidable with respect to each other and to the slot (6) during the rotation of the rotor (5), in order to adhere to the wall of the pumping chamber (20). The side surface of the rotor (5) has, at the outlets of the slot (6), two symmetrical recesses (12A, 12B) each of which can be closed by the head (9A, 9B; 90; 91) of a vane during a portion of the rotation path of the rotor (5), thereby building a closed space (13). A liquid contained in the closed space (13) applies a push to the vanes (7A, 7B; 70; 71; 72) in case of a reduction in the volume of the closed space (13) occurring if the vanes do not adhere to the wall of the pumping chamber (20).
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公开(公告)号：EP2748463A2
公开(公告)日：2014-07-02
申请号：EP12794486.6
申请日：2012-10-10
申请人： VHIT S.p.A.
CPC分类号： F04C29/02 , F04C18/344 , F04C25/02 , F04C27/009 , F04C2240/30 , F04C2240/54
摘要： A rotary vacuum pump, for instance a vane pump, has at least one circumferential groove (6) between facing side surfaces of the rotor (2) and of the rotor guide (3) for receiving a lubricating and sealing fluid. The circumferential groove (6) is a partial annular groove, which has an angular extension of less than 360° and has at least one interruption enabling creating a hydrodynamic fluid bearing in a region opposite a discharge region of the pump (1; 101; 121; 201), over the whole axial extension of the facing surfaces. A method of lubricating a rotary vacuum pump is also provided.
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公开(公告)号：EP2409038A2
公开(公告)日：2012-01-25
申请号：EP10716063.2
申请日：2010-03-17
申请人： VHIT S.p.A.
发明人： CROTTI, Antonio , FERMINI, Franco
CPC分类号： F04C28/06 , F04C29/0071 , F04C2220/10
摘要： A rotary vacuum pump comprises, between the rotor (2) and a driving motor, a control unit (1; 101) for operatively connecting the pump and the motor only in the periods in which the pump operation is required or desired. The control unit (1; 101) includes: a rotating member (12; 112) connected to a motor output and arranged to be made integral for rotation with the pump rotor (2, 10) when the pump operation is required or desired; a plurality of coupling elements (17), which are located between the rotating member (12; 112) and an element (10) belonging to or integral for rotation with the pump rotor (2), and which are arranged to take a coupling position or a decoupling position to make the rotating member (12; 112) and the rotor (2) integral for rotation, or to make the rotating member (12; 112) and the rotor (2) independent of each other, respectively; and actuating members (40, 14, 19, 20, 26; 140, 114, 119, 126) for actuating said coupling elements (17), which actuating members are driven by said rotating member (12; 112) so as to take a first position and a second position in the periods where the pump is operating and in the periods where the pump is not operating respectively.
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