| 摘要 |
<p>A fluid pump, comprising:
a drive section (102) having:
a housing (106);
a coil bobbin (114) disposed in the housing;
a coil (116) wound on the bobbin, the coil having free ends for receiving energizing control signals; and
a first biasing spring (130);
a pump section (104) having a first end and a second end, the first end of the pump section being secured to the drive section.
the pump section also having:
a central aperture (138);
a pump chamber (148) adjacent the central aperture for receiving fluid; and
a first fluid passage (152) for introducing fluid into the pump chamber; and
a nozzle assembly (162) having a nozzle body (164), the nozzle body having a central aperture;
the fluid pump being characterized in that:
the drive section also has:
a pair of permanent magnets (108, 110) fixedly supported within the housing; and
a plunger (124) operatively connected to the coil bobbin;
one of the coil bobbin and the pair of permanent magnets surrounding the other of the coil bobbin and the pair of permanent magnets, the coil bobbin being slidable with respect to the pair of permanent magnets between a first position and a second position, the second position being closer to the pump section than the first position,
movement of the coil bobbin in one direction causing movement of the plunger in the same direction, and
the first biasing spring biasing the plunger and the coil bobbin towards the first position;
the central aperture of the pump section receiving a portion of the plunger of the drive section, and
the nozzle assembly also having:
a poppet (166) positioned in the central aperture of the nozzle body, the poppet being movable between an open position and a sealed position; and
a second biasing spring (170) for biasing the poppet towards the sealed position,
the nozzle body being fitted to the second end of the pump section.</p> |
