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This post was last edited by sdwfsgyykai on 2019-10-7 at 08:31. Our factory uses centrifugal compressors; the pressure at the outlet of the oil pump is around 0.8 Mpa. The lubricating oil passes through an oil cooler and an oil filter before reaching the gearbox, where the pressure is 0.3 Mpa. However, the pressure in the main lubricating oil pipeline is only around 0.245 Mpa. Why is the oil pressure in the gearbox higher than that in the main pipeline? Two-out-of-three interlock for main pipe pressure. Thank you to all the teachers
The flow process of a commonly used lubricating light oil station is as follows: oil tank -- oil pump -- cooler -- filter -- various lubrication points -- back to the oil tank. A check valve and a pre-pump filter are installed at the pump inlet, while a pressure gauge is placed at the pump outlet (which corresponds to the 0.8 MPa you mentioned). A pressure gauge installed after the filter indicates the pressure in the system (which is the 0.3 Mpa you referred to). Before the lubricating oil reaches each lubrication point, there is a throttle bolt used to adjust the oil pressure at those points (likely corresponding to the 0.23 Mpa you mentioned). The section from the oil filter to the throttle adjustment bolts at each lubrication point can be considered as the pressure of the lubrication system. As for the pressures you mentioned, they are the pressures that arise after overcoming resistance. The pressure before the lubrication point is the oil pressure required by it itself. For reference.
This post was last edited by Front Row Spectator on 2019-10-7 at 13:03. It is impossible for the pressure in a branch line to be higher than that in the main line, unless the lubrication for the machine units and the gearbox comes from different pressure regulators; however, in typical centrifuges, the lubrication for the speed increase gearbox and various shaft bearings comes from the same supply of oil. First, rule out any issues with the instruments, and then verify whether the main pipe pressure you mentioned is the pressure after the pressure regulator.