A low-flow pulsation two-way gear pump

Abstract

The invention discloses a low flow pulsating bidirectional gear pump. The pump comprises a pump shell, a driving shaft and a driven shaft, which are arranged in the pump shell, internal gears driven by the driving shaft, external gears, which are fixedly connected to the driven shaft, and a crescent block arranged between the external gears and the internal gears. Three external gears are arranged in the same axis. Three internal gears are arranged in the same axis and engage with the corresponding external gears. The outmost internal gear is fixed with the driving shaft, and two neighbored internal gears cooperate in transmission. Three groups of gears are adopted, wherein in each group the gears are internally engaged, thus the flow pulsation and pressure pulsation during the operation process of gear pump are largely reduced, and the noise and impact are reduced. Passing holes are arranged in the internal gears, so that the fluid can directly enter the gear pump in the radial direction. The structure of the internally engaged gear pump is simplified, and the pump becomes more compact. The three internal gears are inserted and engaged in sequence, thus the slide friction between the outer rings of the three internal gears and the pump shell is eliminated, the rigidity and stability of the system is guaranteed, the pump noise is reduced, and the service life is prolonged.

Description

technical field [0001] The invention relates to the field of gear pumps, in particular to a low-flow pulsation bidirectional gear pump. Background technique [0002] Gear pumps are widely used in hydraulic equipment technical fields such as machine tools, automobiles, injection molding machinery and oil field machinery. [0003] The gear pump is a rotary pump that relies on the change and movement of the working volume formed between the pump cylinder and the meshing gear to deliver or pressurize the liquid. Two closed spaces are composed of two gears, the pump body and the front and rear covers. When the gears rotate, the volume of the space on the side where the gears are disengaged increases from small to large, forming a vacuum to suck the liquid, and the volume of the space on the side where the gears mesh changes from large to large. Small, and the liquid is squeezed into the pipeline. The suction chamber and the discharge chamber are separated by the meshing line of...

AI Technical Summary

Problems solved by technology

However, the inner ring gear of this gear pump has no bearing support. During operation, the inner ring gear and the bearing sleeve of the inner ring gear directly slide and rub against each other. Lubricant fluid medium, and the fluid enters and exits axially relative to the gear, resulting in a larger volume of the pump

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