What should I do if the hydraulic press has problems with oil traps?
Time:2021-03-07
Views:2882
During the meshing process of the external gear pump, in order to make the four-column hydraulic gear pump run smoothly and continuously suck and press the oil, the coincidence degree of the gear 8 should be greater than 1, that is, before the first pair of gear teeth are disengaged, the latter pair The gear teeth have entered meshing. When two pairs of gear teeth mesh at the same time, a dead volume is formed between them. With the rotation of the gear, the dead volume first changes from large to small, and then from small to large. Therefore, the gear pump is trapped in oil. In order to eliminate this phenomenon of oil trapping, unloading grooves are often opened on the front and rear cover plates or floating sleeves of the pump to make the closed volume limit small. The volume changes from large to small and communicates with the oil pressure chamber. The oil suction cavity is connected.
In the double-acting vane pump, because the included angle of the stator arc part>the interval included angle of the oil distribution window>the included angle of the two blades, although there is a closed volume between the suction and pressure distribution windows, the volume is not the same. Change, so there will be no oil trapping. However, since neither the arc curve on the stator nor its center angle can be made very accurate, a slight oil trapping phenomenon may still occur. In order to overcome the hazard of this trapping phenomenon, the four-column hydraulic machine often opens a triangular groove at the front end of the oil pressure window of the oil distribution plate to reduce the sudden pressure change in the oil cavity and reduce the pulsation and noise of the output pressure.
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