The Harm and Prevention Methods of Insufficient Oil Suction in Rexroth Oil Pumps

Rexroth oil pump plays an important role in hydraulic systems due to its excellent performance and reliability. However, the issue of insufficient oil suction may severely impact the normal operation of the pump. This article will explore the hazards of insufficient oil suction in rexroth oil pump and corresponding prevention methods to help users maintain the long-term stability of the pump.

Hazards of Insufficient Oil Suction in Rexroth Oil Pump

Rexroth oil pump undertakes critical tasks in hydraulic systems, and the hazards caused by insufficient oil suction cannot be ignored. Insufficient oil suction typically leads to the following problems:

Damage to Friction Pairs

Rexroth oil pump with insufficient oil suction will result in an inadequate amount of hydraulic oil inside the pump body, causing dry friction on the friction pairs. For example, pump discs may overheat due to a lack of oil, eventually burning the bearings, and in severe cases, the entire pump body could become scrapped.

Decline in Pump Performance

Insufficient oil suction will affect the normal flow and pressure of eexroth oil pump, reducing its performance. The output flow of the plunger pump may significantly drop, the working pressure decrease, ultimately reducing the system's efficiency.

Increased Maintenance Costs

Long-term insufficient oil suction can cause serious damage to the rexroth oil pump, increasing the cost of maintenance and part replacement. Regular inspection and maintenance can prevent these issues, but neglecting them can lead to more frequent repairs and higher expenses.

Prevention Methods for Insufficient Oil Suction in Rexroth Oil Pump

To effectively prevent rexroth oil pump from insufficient oil suction and ensure its normal operation, the following measures should be taken:

Optimize the Design of the Suction Pipe

The design of the suction pipe is crucial for the rexroth oil pump's suction effect. Ensure the inner diameter of the suction pipe is larger than the outlet diameter of the pump housing, and make it 1.5 times the diameter of the pump housing's leakage port. This ensures the rexroth oil pump's leakage port acts as a second suction port, with a flow rate reaching 15% of the plunger pump's suction port. Additionally, avoid overly long suction pipes and too many bends to reduce resistance in hydraulic oil flow.

Control Oil Flow Speed

Keep the hydraulic oil flow speed at rexroth oil pump's suction port below 0.5m/s. Excessive flow speed can lead to insufficient flow, not meeting the pump's demand. Ensuring a stable oil flow speed helps prevent issues caused by insufficient oil suction.

Maintain Stable Pump Speed

Rexroth oil pump's speed should be maintained within an appropriate range to avoid excessively high speeds. High speeds can increase the output flow of the plunger pump, but pressure may be low, affecting the overall system stability. Properly controlling the pump speed helps prevent insufficient oil suction.

Ensure a Unobstructed Leakage Port

The oil pipe between the pump housing's leakage port and the hydraulic oil tank should be designed reasonably, ensuring the inner diameter of the oil pipe is large enough without obstructions. The leakage pipe should be 200mm below the oil surface, ensuring the hydraulic pump can normally suction hydraulic oil under any working condition, maintaining a stable supply of internal hydraulic oil.