How to reduce the power loss of the hydraulic station (referring to the work done by objects in unit time)

Excessive internal resistance of the hydraulic station will reduce the overall efficiency of the system. On the other hand, the lost energy will be converted into heat energy, which will raise the temperature of hydraulic oil, deteriorate the oil, and cause hydraulic equipment failure. The hydraulic station is a hydraulic source equipment composed of hydraulic pump, driving motor, oil tank, reversing valve, saving valve and overflow valve, or a hydraulic equipment including control valve. According to the flow direction, pressure and flow required by the drive equipment, it is applicable to all kinds of machines that drive the equipment separately from the hydraulic station. The hydraulic system connects the hydraulic station with the driving equipment (oil cylinder or motor) through the oil pipe, which can realize various specified actions. Therefore, when planning the hydraulic station, the power loss of the lowering system should be fully considered on the premise of satisfying the operation requirements.

First of all, consider the power source - pump, consider the diversity of working conditions of hydraulic cylinder, sometimes the system needs large flow and low pressure; Sometimes a small flow of high pressure is required. The hydraulic station is a hydraulic source equipment composed of hydraulic pump, driving motor, oil tank, reversing valve, saving valve and overflow valve, or a hydraulic equipment including control valve. According to the flow direction, pressure and flow required by the drive equipment, it is applicable to all kinds of machines that drive the equipment separately from the hydraulic station. The hydraulic system connects the hydraulic station with the driving equipment (oil cylinder or motor) through the oil pipe, which can realize various specified actions. Therefore, it is advisable to select a pressure limiting variable displacement pump, because the flow of this type of pump changes with the change of system pressure. When the system pressure drops, the flow is relatively large, which can satisfy the fast stroke of the actuator. When the system pressure increases, the flow decreases accordingly, and the working stroke of the actuator can be satisfied. This not only satisfies the working requirements of the actuator, but also makes the power consumption more reasonable.

Secondly, if the actuator has speed regulation requirements, when selecting the speed regulation circuit, we should not only satisfy the speed regulation requirements, but also reduce the power loss (referring to the work done by the object in unit time) Z. Hydraulic system is used in hydraulic station because of its wide application, high efficiency and simple transmission structure. The main task of the hydraulic system is to convert power from one way to another. Common speed regulating circuits mainly include: saving speed regulating circuit, measuring speed regulating circuit and saving speed circuit. Among them, saving speed regulating circuit has large power loss and good low-speed stability. However, the volume speed regulating circuit has neither overflow loss nor saving loss, and has high efficiency, but poor stability at low speed. If both requirements are satisfied, the volume saving speed regulating circuit composed of differential pressure variable pump and saving valve can be selected. The pressure difference at both ends of the saving valve can be as small as possible to reduce pressure loss.

Third, when hydraulic oil flows through various hydraulic valves, there will inevitably be pressure loss and flow loss, which account for a large share of the total energy loss. Therefore, reasonable selection of hydraulic equipment and adjustment of pressure of pressure valve is also an important aspect of reducing power loss. The flow valve is selected according to the flow conditioning scale in the system. Its flow is small and stable, which can meet the application requirements. The pressure of the pressure valve shall be as low as possible under the condition of satisfying the normal operation of the hydraulic equipment. Fourth, select the hydraulic oil reasonably. When the hydraulic oil moves in the pipeline, it will show viscosity. When the viscosity is too high, greater internal friction will occur, which will make the oil warm up and increase the resistance. When the viscosity is too low, it is easy to form leakage, thus reducing the volume efficiency of the system. Therefore, oils with appropriate viscosity and good viscosity temperature characteristics are generally selected. In addition, when the oil moves in the pipeline, there will be pressure loss along the pipeline and local pressure loss, so the pipeline should be shortened as far as possible to reduce elbows.