Hydraulic power unit including centrifugal pump and vane pump in motor

Abstract

The invention provides a hydraulic power unit including a centrifugal pump and a vane pump in a motor. A motor rotor (3) is connected with a rotor sleeve (4) and a spindle (23) to form a rotor body, and is supported on an end cover (20) and a pump core seat (6) by a sliding bearing (15) in the pump core seat (6) and two groups of rolling bearings (22) in the end cover (20); the vane pump (8) is connected with a spindle (23) by a spline (23b), mounted in the pump core seat (6), and fixed on a stand (1) by an oil outlet press cover (13); a motor stator (2) is pressed on a boss (1d) within the stand (1); the end cover (20) and a sealing ring (19) are fixed on the stand (1); an oil outlet of the vane pump (8) is communicated with a runner (13a) of the oil outlet press cover (13) so as to output high pressure oil; power is supplied to the motor in the hydraulic power unit by a wiring terminal (28); and the wiring terminal (28) and a sealing ring (30) are fixed on the stand (1) by a bolt (26) and a press cover (29).

Description

technical field [0001] The invention relates to a hydraulic motor pump power unit, in particular to a hydraulic power unit of a motor vane pump containing a centrifugal pump. Background technique [0002] The hydraulic power unit is the heart of the hydraulic system. At present, the hydraulic power unit with the electric motor as the driving force is a discrete structure. Vane pump is a structural form of hydraulic pump, which has the advantages of good flow uniformity and low noise, so it has been widely used. As an independent hydraulic power element, the vane pump needs to be connected with an independent motor or internal combustion engine through its outrigger pump shaft to form a motor-hydraulic pump unit to form a hydraulic power unit to work. This connection requires couplings, pump frames and other devices. Due to the large volume of the independent motor and the accessories such as couplings, the volume and weight of the entire hydraulic power unit are very large....

AI Technical Summary

Problems solved by technology

In addition, the motor connected to the vane pump generally contains a cooling fan, so the noise of the entire hydraulic power unit is also very large; at the same time, because the vane pump has an overhanging shaft, there is an external leakage path

General hydraulic pumps have the problem of insufficient oil absorption to varying degrees. Therefore, an auxiliary pump needs to be installed at the oil suction port of the main pump to improve the oil absorption capacity of the main pump. The auxiliary pump is generally an independent hydraulic pump and needs to be driven by a separate motor. The whole hydraulic power unit is relatively complex and bulky

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