Techniques for reducing power loss in hydraulic systems
1. Reasonably choose hydraulic oil. When the hydraulic oil flows in the pipeline, it will show viscosity, and when the viscosity is too high, it will generate a greater internal friction, causing the oil to heat up, and at the same time increase the resistance when the oil flows. When the viscosity is too low, it is easy to cause leakage, which will reduce the volumetric efficiency of the system. Therefore, oils with suitable viscosity and good viscosity-temperature characteristics are generally selected. In addition, when the oil flows in the pipeline, there will be pressure loss and local pressure loss along the way. Therefore, the pipeline should be shortened as much as possible when designing the pipeline.
2. On the one hand, the power loss of the hydraulic system will cause a loss of energy and reduce the overall efficiency of the system. On the other hand, this part of the lost energy will be converted into heat energy, which will increase the temperature of the hydraulic oil and deteriorate the oil. , Causing the hydraulic equipment to malfunction. Therefore, when designing a hydraulic system, under the premise of meeting the requirements for use, full consideration should be given to reducing the power loss of the system. First of all, from the perspective of the power source pump, considering the diversified working conditions of the actuator, sometimes the system needs to be large. Flow, low pressure; sometimes small flow and high pressure are needed.
3. So it is advisable to choose a pressure-limiting variable pump, because the flow of this type of pump changes with the change of system pressure. When the system pressure decreases, the flow rate is relatively large, which can satisfy the fast stroke of the actuator. When the system pressure increases, the flow rate decreases accordingly, which can meet the working stroke of the actuator. This can not only meet the working requirements of the actuator, but also make the power consumption more reasonable. Secondly, if the actuator has the requirement of speed regulation, then when selecting the speed regulation circuit, it is necessary to meet the requirements of speed regulation and minimize it. Power loss. The common speed control loops mainly include: throttling speed control loop, volume speed control loop, volume throttling speed control loop. Among them, the power loss of the throttle speed control loop is large, and the low speed stability is good. The volumetric speed control loop has neither overflow loss nor throttling loss, which has high efficiency but poor low-speed stability. If you want to meet the requirements of both aspects at the same time, you can use a differential pressure variable pump and a throttle valve to form a volume throttling speed control circuit, and make the pressure difference between the two ends of the throttle valve as small as possible to reduce pressure loss.
4. When hydraulic oil flows through various hydraulic valves, there will inevitably be pressure loss and flow loss. This part of the energy loss occupies a large proportion of the total energy loss. Therefore, a reasonable choice of hydraulics and adjustment of the pressure of the pressure valve are also an important aspect of reducing power loss. The flow valve is selected according to the flow adjustment range in the system and its minimum stable flow can meet the requirements of use. The pressure of the pressure valve should be as low as possible when the hydraulic equipment is working normally.