Novel variable pump system of hydraulic power unit

Abstract

The invention relates to a novel variable pump system of a hydraulic power unit, comprising a pump body, a motor main body, a hydraulic motor, an overflow valve unit and a split-flow reducing valve, wherein the motor main body and the hydraulic motor are respectively arranged at two sides of the pump body, an external oil path of the hydraulic motor is connected with a throttle valve I, a power-driven one-way valve and an energy accumulator in sequence, the overflow valve unit is arranged on another oil path outside the pump body, and the overflow valve unit is connected with the split-flow reducing valve and a throttle valve II in sequence. The novel variable pump system has the beneficial effects that the variable of flow rate from zero to full flow can be realized, the core principles of the pump are realized by fixed displacement pump types (such as a gear pump, a vane pump, plunger pump and the like); moreover, the conversion of constant pressure, constant power, proportion variable and load sensitivity can be realized by the novel variable pump system.

Description

technical field [0001] The invention relates to the technical field of hydraulic pumps, in particular to a novel variable pump system of a hydraulic pump station. Background technique [0002] Variable displacement pumps are mainly divided into variable vane pumps and variable displacement plunger pumps, and there is no variable variable gear pumps; among them, gear pumps are still widely used because they are durable and easy to process, but they have caused many problems because they cannot be variable. Energy waste problem. In addition, the variable variable pump is divided into constant pressure variable, constant power variable, load sensitive variable, proportional variable and other types in terms of its variable mode. Inconvenience or waste of energy. Although the frequency conversion motor plus quantitative pump has developed to a certain extent in recent years, due to the self-priming nature of the oil pump, there is a certain requirement for the minimum speed, a...

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Problems solved by technology

[0002] Variable displacement pumps are mainly divided into variable vane pumps and variable plunger pumps, and there is no variable variable gear pumps; the gear pumps are still widely used because they are durable and easy to process, but they have caused many problems because they cannot be variable. energy waste problem

In addition, the variable variable pump is divided into constant pressure variable, constant power variable, load sensitive variable, proportional variable and other types in terms of its variable mode. Inconvenience or Waste of Energy

Although the frequency conversion motor plus quantitative pump has developed to a certain extent in recent years, due to the self-priming of the oil pump, there is a certain requirement for the minimum speed, and it cannot achieve a variable flow rate of 0, and there is still energy waste.

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