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the design of hydraulic system

Someone with a little mechanical knowledge knows that energy will convert one another, and it is best to apply this knowledge to the hydraulic system to explain the power loss of the hydraulic system. On the one hand, the power of the hydraulic system can cause an energy loss, Of the total efficiency decline, on the other hand, the loss of this part of the energy will be converted into heat, the hydraulic oil temperature, oil deterioration, resulting in hydraulic equipment failure. Therefore, the design of hydraulic system, to meet the requirements of the premise, but also give full consideration to reduce system power loss.
First, from the power source - pump aspects to consider, taking into account the diverse working conditions of the actuator, and sometimes the system requires large flow, low pressure; sometimes small flow, high pressure. So choose pressure-limiting variable pump is appropriate, because this type of pump flow with the system pressure changes. When the system pressure is reduced, the flow rate is relatively large, to meet the rapid stroke of the actuator. When the system pressure increases when the flow is reduced, to meet the work of the actuator stroke. This will not only meet the requirements of the actuator work, but also make the power consumption more reasonable.
Second, the pressure loss and flow loss inevitably exist when the hydraulic oil flows through various types of hydraulic valves. The energy loss in this part accounts for a large proportion of the total energy loss. Therefore, a reasonable choice of hydraulic pressure to adjust the pressure valve is also an important aspect to reduce power loss. Flow valve according to the system to select the flow adjustment range and ensure that the minimum steady flow to meet the requirements, the pressure of the pressure valve to meet the normal work of hydraulic equipment, try to take a lower pressure.
Third, if the actuator with speed requirements, then select the speed loop, it is necessary to meet the speed requirements, but also to minimize power loss. Common speed control loop are: throttling speed control circuit, volume control circuit, the volume of throttle control circuit. One throttling speed control circuit power loss, low speed and good stability. The volumetric speed control loop has neither overflow loss nor throttling loss, high efficiency, but poor low speed stability. If you want to meet both requirements at the same time, you can use differential pressure variable displacement pump and throttle valve composed of the volume control circuit, and throttle the pressure difference between the ends as small as possible to reduce the pressure loss.
Fourth, a reasonable choice of hydraulic oil. Hydraulic fluid in the pipeline flow will show viscosity, and viscosity is too high, it will have a greater internal friction, resulting in oil heat, while increasing the flow of oil resistance. When the viscosity is too low, easy to cause leakage, will reduce the system volumetric efficiency, therefore, the general choice of viscosity and viscosity properties of good viscosity of the oil. In addition, when the oil flow in the pipeline, there are still pressure loss along the way and the local pressure loss, so try to shorten the pipeline design pipe, while reducing the elbow.
The above is to avoid the hydraulic system power loss proposed by the work, but there are many factors that affect the hydraulic system power loss, so if the specific design of a hydraulic system, the need to consider all other aspects of the requirements>

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