Hydraulic oil supply unit, hydraulic power unit and oil supply control method of hydraulic oil supply unit

Abstract

The invention relates to a hydraulic oil supply unit which comprises an oil flow regulating device, an oil pressure regulating device, a control unit (4) and an oil supply control oil way (10), wherein the oil supply control oil way (10) is provided with a flow detection device (2); one of the oil flow regulating device and the oil pressure regulating device is arranged on the oil supply control oil way (10), and the other one is used for controlling a hydraulic pump; the oil flow regulating device and the oil pressure regulating device are respectively and electrically connected with the control unit (4), so as to regulate the oil flow (Qs) and the oil pressure (Ps) of the hydraulic oil supply unit through the control of the control unit; and the flow detection device (2) is electrically connected with the control unit. In addition, the invention further provides an oil supply control method and a hydraulic power unit of the hydraulic oil supply unit. In the aspects of constant pressure oil supply control, constant-current source oil supply control and the like, the hydraulic oil supply unit, the hydraulic power unit and the oil supply control method have the advantages of higher control flexibility, wider applicability and better energy saving, and the control precision is obviously increased.

Description

technical field [0001] The invention relates to a hydraulic oil supply unit for supplying hydraulic oil to a hydraulic system. Further, the present invention relates to a hydraulic pump station comprising the hydraulic oil supply unit. In addition, the present invention also relates to an oil supply control method using the hydraulic oil supply unit. Background technique [0002] The hydraulic pump station is mainly used to supply hydraulic oil to the hydraulic system of mechanical equipment, which generally includes motors, hydraulic pumps, oil tanks, etc. According to application requirements, the hydraulic pump station can be a constant pressure hydraulic pump station or a constant flow hydraulic pump station. In the prior art, the constant pressure hydraulic pump station generally adopts the form of quantitative pump plus relief valve, which can provide hydraulic oil with constant pressure to the load. Part of the hydraulic oil flow output by the quantitative pump is s...

AI Technical Summary

Problems solved by technology

[0007] First, the pressure regulation accuracy of the relief valve is reduced. Under the same setting pressure of the pressure regulating spring, the adjustment pressure of the relief valve with a small overflow flow is smaller than that of the relief valve with a large overflow flow. Pressure, that is, the relief valve has a large pressure regulation deviation due to the change of the relief flow

[0008] Second, the throttling loss of the relief valve changes, and the throttling loss is proportional to the overflow flow. When the hydraulic pump station operates under the condition of large overflow flow, the overflow loss of the constant pressure hydraulic pump station is very large. The efficiency is very low, and most of the hydraulic oil pumped by the hydraulic pump flows back to the oil tank through the overflow valve, wasting energy

However, the overflow flow of the existing constant-pressure hydraulic pump station has a large range of changes, which will reduce the pressure regulation accuracy, resulting in unstable system pressure Ps, and cannot maintain a sufficiently stable and high-precision constant-pressure oil supply

In addition, the overflow loss of this prior art constant pressure hydraulic pump station is relatively large, and the energy saving performance is poor

[0014] For the existing constant flow source pump station, the system pressure must be lower than the opening pressure of the relief valve of the pump station. If the system pressure is close to the set pressure of the relief valve of the pump station, overflow flow will be generated, thereby reducing the accuracy of flow regulation , which limits the maximum working pressure range of the constant flow hydraulic pump station

[0015] In addition, it can be seen from the above two types of hydraulic pump stations in the prior art that the existing hydraulic pump stations cannot realize the convenient switching between the constant pressure oil supply mode and the constant current oil supply mode, which makes the existing hydraulic pump The station cannot switch the oil supply mode according to the application needs, which limits the scope of application of the hydraulic pump station

Images