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The method of reducing the power loss of the hydraulic system of the construction machinery equipment.

2018-04-27

On the one hand, the power loss of the hydraulic system will cause energy loss and reduce the total efficiency of the system. On the other hand, the lost part of the energy will be converted into heat energy, which will increase the temperature of the hydraulic oil and deteriorate the oil. Cause hydraulic equipment to malfunction.
On the one hand, the power loss of the hydraulic system will cause energy loss and reduce the total efficiency of the system. On the other hand, the lost part of the energy will be converted into heat energy, which will increase the temperature of the hydraulic oil and deteriorate the oil. Cause hydraulic equipment to malfunction. Therefore, when designing the hydraulic system, under the premise of meeting the requirements of use, we should also fully consider reducing the power loss of the system.
 
First of all, from the power source-pump to consider, taking into account the diversification of the working conditions of the actuator, sometimes the system needs large flow, low pressure; sometimes need small flow, high pressure. Therefore, it is appropriate to choose a pressure limiting variable displacement pump, because the flow rate of this type of pump changes with the change of system pressure. When the system pressure is reduced, the flow rate is relatively large, which can meet 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 control circuit, it is necessary to meet the requirements of speed regulation and minimize power loss. Common speed control circuit mainly includes: throttle speed control circuit, volume speed control circuit, volume throttle speed control circuit. Among them, the power loss of the throttling speed control circuit is large and the low speed stability is good. The volume speed control circuit has neither overflow loss nor throttling loss, high efficiency, but poor low-speed stability. If you want to meet the requirements of two aspects at the same time, you can use a differential pressure variable pump and throttle valve composed of volume throttling speed control circuit, and the pressure difference between the two ends of the throttle valve as small as possible to reduce the pressure loss.
 
Third, when hydraulic oil flows through various hydraulic valves, there is inevitably a pressure loss and flow loss, and this part of the energy loss accounts for a large proportion of the total energy loss. Therefore, a reasonable choice of hydraulic pressure, adjust the pressure valve pressure is also an important aspect of reducing power loss. The flow valve is selected according to the flow adjustment range in the system and ensures that its minimum stable flow can meet the use requirements. The pressure of the pressure valve should be as low as possible under the condition that the hydraulic equipment works normally.
 
Fourth, a reasonable choice of hydraulic oil. When the hydraulic oil flows in the pipeline, it will show viscosity, and when the viscosity is too high, it will produce greater internal friction, causing the oil to heat up and increasing 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, the oil with suitable viscosity and good viscosity-temperature characteristics is generally selected. In addition, when the oil flows in the pipeline, there is also a pressure loss along the way and local pressure loss, so the design of the pipeline as short as possible, while reducing the bend.
 
The above is only from reducing the power loss of the hydraulic system to consider, when the specific design of a hydraulic system, but also to consider other aspects of the requirements.