Pumps – Motor driven – Pump within rotary working member
Reexamination Certificate
1999-10-29
2001-01-30
Walberg, Teresa (Department: 3742)
Pumps
Motor driven
Pump within rotary working member
Reexamination Certificate
active
06179579
ABSTRACT:
PRIOR ART
The invention relates to a multi-stage side-channel pump for fuel for a motor vehicle, of the generic type defined by the preamble to claim
1
.
From international patent disclosure WO 95/25885, a fuel pump is known which is accommodated as a side-channel pump together with an electric motor in a housing. The electric motor drives the side-channel pump. To that end, the electric motor has an armature winding mounted on the rotor shaft of the fuel pump. This winding runs in a stator comprising permanent magnet segments. The supply of current to the rotor winding is effected via a commutator seated on the rotor shaft and two current brushes resting radially with spring pressure on the commutator. This one-stage fuel pump can be converted into a multi-stage fuel pump, of the kind also known in the prior art, by disposing a further impeller on the rotor axis.
ADVANTAGES OF THE INVENTION
The multi-stage side-channel pump according to the invention for fuel for a motor vehicle having the definitive characteristics of claim
1
has the advantage that a multi-stage nature of this side-channel pump is attained while reducing the number of impellers required. First blade chambers of a precursor stage and second blade chambers of a main stage are integrated into a single impeller. In addition, a brushless DC motor is integrated with the impeller of the side-channel pump. The rotor is simultaneously the impeller. It may be necessary for the outside diameter of the impeller of the side-channel pump to be increased. However, by additional provisions, this makes it possible to improve the efficiency of the side-channel pump. For instance, a preferred radial channel course in the inflow and outflow region of the main stage can be made in streamlined fashion. In this way, it is possible to make the side-channel pump more compact and with less engineering effort. The overall result is a very shallow unit.
By means of the provisions recited in the other claims, advantageous refinements of and improvements to the multistage side-channel pump defined by claim
1
for fuel for a motor vehicle are possible.
An especially advantageous embodiment provides that the side-channel pump is embodied as a two-stage two-sided channel pump. This has characteristics of a kind that can each be advantageously employed in a side-channel pump for fuel for a motor vehicle as defined by claim
1
. The side-channel pump has an impeller which has first and second blade chambers. The first blade chambers are those of a precursor stage, and the second blade chambers are those of a main stage. The second blade chambers are surrounded concentrically in the impeller by the first blade chambers. Since the side-channel pump is embodied with two sides, an upper first side and a lower second side of the impeller are each open to a side channel. The impeller in turn is at the same time the rotor of the electric motor. This rotor is brushless. To that end, it has permanent magnet segments on an outer blade ring of the impeller. While the precursor stage, located closer to an axis of rotation of the impeller, is used to fill a pot which is built into a tank of the motor vehicle, the main stage located farther away assures a requisite system pressure to gasoline injection valves of an internal combustion engine. The main stage has an intake tract, which extends radially into the main stage. Via this intake tract, fuel is aspirated from the built-in pot in the tank. After the pressure buildup in the main stage, the fuel is carried radially outward out of the main stage via a transition channel, and the transition channel discharges into a manifold pipe. This manifold pipe carries the fuel onto the engine. The manifold pipe is preferably integrated with a pot rim of the side-channel pump for fuel for a motor vehicle. In this way, production can be simplified considerably, because fewer components are needed.
The side-channel pump also has a check valve and a fuel line between the precursor stage of the built-in tank pot. This prevents the built-in pot in the tank, previously filled with fuel by the precursor stage, from emptying again when the side-channel pump is not running.
REFERENCES:
patent: 5472321 (1995-12-01), Radermacher
patent: 5551842 (1996-09-01), Schmidt et al.
patent: 5904468 (1999-05-01), Dobler et al.
patent: 5961276 (1999-11-01), Huebel et al.
patent: 95/25885 (1995-09-01), None
Dobler Klaus
Huebel Michael
Strohl Willi
Patel Vinod D.
Robert & Bosch GmbH
Striker Michael J.
Walberg Teresa
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