After investigation, it was found that the volume of the plastic tank fuel tank was too small and the heat dissipation area was not enough. The cooling device was too small. High climatic and operating environment temperatures have caused the oil temperature to rise. If the viscosity of the oil is selected improperly, the viscosity is large, the viscosity resistance is large, and the viscosity is too small, the leakage will increase. In both cases, it can cause heating temperature rise.
Secondly, the system tubing of the plastic bucket is too thin and too long, with excessive bending, local pressure loss and pressure loss along the process are large. The component accuracy is not enough and the assembly quality is poor, and the mechanical friction loss between the relative movements is large. The mating clearance of the mating parts is too small, or the gap is too large after use, and the internal and external leakage is large, resulting in a large volume loss. For example, the volume efficiency of the pump is reduced, and the temperature rise is fast.
The last case is that the fixed barrel pump oil supply system that selects the oil pump capacity according to the fast forward speed of the plastic barrel will have most of the excess flow from the overflow valve under high pressure and generate heat during work. The unloading circuit in the system is faulty or because the unloading circuit is not set, the oil pump cannot be unloaded when it stops working, and the entire flow of the pump overflows under high pressure, generating overflow loss and heating, resulting in temperature rise.https://www.fhpails.com/