Fixed Displacement Radial Piston Pump Fault Analysis and Introduction to Application Cases

Fixed displacement radial piston pump, as a key device in hydraulic systems, is widely used in various application scenarios due to its high volumetric efficiency and stable performance. This article will delve into the common causes of failure of the fixed displacement radial piston pump, analyze its application effects through practical case studies, to help users better understand and maintain this important equipment.

Working Principle of the Fixed Displacement Radial Piston Pump

The working principle of the fixed displacement radial piston pump is based on the reciprocating motion of the piston within the pump cylinder. This motion causes volume changes between the piston and the pump wall, resulting in repeated suction and discharge of the liquid within the pump, thereby increasing the pressure. Compared to other types of pumps, its volumetric efficiency can reach 0.92~0.98, and it can operate stably under pressures as high as 35MPa. Its design allows the fixed displacement radial piston pump to have low pressure pulsation in output flow and effectively adjust displacement, making it suitable for applications requiring high pressure, large flow, and flow regulation, such as construction machinery and aerospace fields.

Common Failures and Cause Analysis

In practical use, the fixed displacement radial piston pump may encounter a variety of failures that affect its performance and lifespan. Here are several common failures and their causes:

Reduced Output Flow

When the fixed displacement radial piston pump experiences reduced output flow, it is usually due to an increased clearance in the piston hole or wear on the ball head. Piston wear or increased clearance will cause oil leakage, leading to a drop in pump flow. Additionally, poor sealing of the check valve outlet or a broken spring piston can also cause similar problems.

Increased Noise

If the fixed displacement radial piston pump emits abnormal noise during operation, it may be due to friction or damage between the bearings and the drive shaft. Prolonged use of the pump can lead to bearing temperature rise and wear, affecting the normal operation of the pump. Furthermore, the quality of the hydraulic oil is another important factor that can cause increased noise.

Unstable Operation

The fixed displacement radial piston pump may exhibit unstable operation typically due to insufficient cleanliness of the oil in the pump, or wear and aging of components such as pistons and valve plates. Regular replacement of hydraulic oil and cleaning of the oil tank can effectively prevent these problems from occurring.

Application Case Analysis of the Fixed Displacement Radial Piston Pump

In the aerospace field, the fixed displacement radial piston pump is widely used due to its high volumetric efficiency and stability. For example, a certain airline uses the fixed displacement radial piston pump which shows excellent reliability and durability in high-pressure environments. With regular maintenance and proper operations, these pumps can maintain stable performance under high-intensity working conditions, ensuring the safe operation of aircraft.

In the field of construction machinery, the fixed displacement radial piston pump also plays an important role. For example, a large construction company's excavator uses the fixed displacement radial piston pump to provide efficient hydraulic drive. After extensive practical operation, the pump performs stably and requires infrequent maintenance, providing strong assurance for the company's project progress.