Hydraulic energy-saving system and control method for matching variable speed motor and constant power variable pump
A constant power variable, hydraulic system technology, applied in the direction of pump control, liquid variable capacity machinery, mechanical equipment, etc., can solve the problems of complex information collection, high cost, and lengthy data processing, and achieve simple control mode and low cost , Improve the effect of energy-saving defects
Active Publication Date: 2017-11-07
HEFEI UNIV OF TECH
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Problems solved by technology
The amount of information collected by this control method is complex, and the data processing is lengthy, making its control complex
There are differences in each hydraulic equipment, and the database obtained from a large number of tests cannot be used in the same model, making the method difficult and costly in industrial applications
Method used
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Embodiment Construction
[0022] see figure 1 In this embodiment, the hydraulic energy-saving system in which the variable speed motor is matched with the constant power variable pump includes a hydraulic system and a control system.
[0023] The hydraulic system includes a variable frequency motor 1 with adjustable speed and a constant power variable pump 2 coaxially connected with the variable speed motor 1; The oil port C of the three-position four-way electromagnetic reversing valve 4 with neutral unloading function is connected, the other is connected with the inlet of the first overflow valve 5, and the oil outlet of the first overflow valve 5 is connected with the oil tank 3; The oil return port T of the three-position four-way electromagnetic reversing valve 4 is connected to the oil tank 3, the oil outlet A of the three-position four-way electromagnetic reversing valve 4 is connected to the rodless chamber of the hydraulic cylinder 6, and the three-position four-way electromagnetic reversing ...
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The invention discloses a variable speed motor and constant-power variable displacement pump matched hydraulic energy-saving system and a control method. The variable speed motor and constant-power variable displacement pump matched hydraulic energy-saving system and the control method are characterized in that the variable speed motor and constant-power variable displacement pump matched hydraulic energy-saving system comprises a hydraulic system and a control system; the hydraulic system comprises a variable frequency motor and a constant-power variable displacement pump connected with the variable frequency motor coaxially; according to the process property of the hydraulic system, model selection is conducted on the constant-power variable displacement pump; and the relation between pressure and torque is established, the relation of the pressure and rotation speed is obtained, and subsection control is conducted on motor speed according to a collected pressure value. According to the variable speed motor and constant-power variable displacement pump matched hydraulic energy-saving system and the control method, the energy matched degree of a driving system and a time sequence load is improved effectively, and the energy-saving defect of the constant-power variable displacement pump in a low pressure area is overcome.
Description
technical field [0001] The invention relates to a hydraulic system and a control method thereof, and more specifically illustrates a hydraulic energy-saving system and a control method thereof in which a variable speed motor is matched with a constant power variable pump. technical background [0002] In industrial production, hydraulic systems that use electric energy as the power source have considerable energy loss in energy transfer, so there is a huge space for energy saving. Improving the energy utilization efficiency of hydraulic systems is of great significance for alleviating energy shortages and reducing the greenhouse effect. . The energy loss in the hydraulic system has many forms. In addition to the energy loss caused by the structure of each component of the system, the energy loss caused by the mismatch between the drive unit and the load power of the hydraulic system accounts for a larger proportion. [0003] For the problem of improper power matching of the...
Claims
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IPC IPC(8): F04B49/00
CPCF04B49/002
Inventor 刘志峰刘晓鹏李磊秦利民石方亮
Owner HEFEI UNIV OF TECH