Structural principle of progressive distributor

Take the 10-hole progressive distributor as an example (as shown in the figure). The distributor has a total of 10 oil drain holes. There are 5 valve chambers in the valve body the same as the A, B, C, D, E5 plunger spools. Sliding fit, when running, it is set to drain oil 9 holes first, the sequence of oil drain is 9 (A to the right), 2 (B to the right), 4 (C to the right), 6 (D to the right), 8 (E To the right), 10 (A to the left), 1 (B to the left), 3 (C to the left), 5 (D to the left), 7 (E to the left), cycle in turn, interrelated. There are many oil passages in the valve body, which are like a labyrinth spread. There are two oil passage trapped areas the grease can never be drained. The oil drain holes 9 10 need to flow through the two trapped areas when draining, flow in the valve body. The longest distance is up to 270mm, the oil passage aperture is very small, between 2mm 3mm. The 16-hole progressive distributor has a longer flow distance in the valve body, up to 400mm.

Progressive centralized smoothing system failure analysis

The progressive centralized lubrication system for construction machinery is generally equipped with a safety valve at the oil outlet of the plunger lubrication pump, the opening pressure is set at 30～35MPa at the factory. When the system device is debugged, the pump outlet pressure is generally more than ten MPa Inside, some are only a few megapascals.

In the process of long-term high-pressure transportation of grease, the base oil of the progressive grease dispenser is continuously precipitated, the thickening agent deposits adheres to the pipe wall of the pipeline the slender oil passage wall of the progressive distributor, which constitutes an "obstruction" the total pipeline The resistance gradually increases. When the safety valve opening pressure is reached, the safety valve opens overflows, the oil flow is stopped, the system alarms; perhaps the pipeline burst before the total resistance of the pipeline reaches the safety valve opening pressure, which usually occurs in the front pipe of the mother distributor road.

The oil trapped area in the oil passage the grease in the valve body of the progressive distributor can never be drained out, aggravates the rapid formation of blockage.

After the end pipeline of any progressive distributor is blocked, the progressive oil discharge cycle of the single-line progressive distributor is terminated, causing a chain reaction, causing the upper level of the parent distributor to block, the parent distributor progressively draining oil The circulation is also stopped, all progressive distributors stop working, the centralized smooth system is paralyzed.

Progressive distributors are difficult to identify the source of faults, distributors are often replaced in groups, the repair cost is high.

blockage is the inevitable outcome of progressive dispensers for viscous grease.