Internal gear pumps and external gear pumps are two commonly used types of hydraulic pumps in various industries. While both serve the purpose of fluid transfer, there are distinct advantages that set the internal gear pump apart from its external counterpart. Understanding these advantages is crucial for optimizing hydraulic system performance and achieving desired outcomes.
The main advantage of an internal gear pump over an external gear pump lies in its superior volumetric efficiency. Volumetric efficiency refers to the ability of a pump to transfer a larger volume of fluid per revolution. Internal gear pumps excel in this aspect due to their unique design and operating principles.
In an internal gear pump, the fluid is transferred through the interaction of two gears—an external gear and an internal gear. As the gears rotate, fluid is trapped between the teeth of the gears and the pump housing, creating a positive displacement effect. The tight tolerances between the gears and the housing minimize internal leakage, resulting in higher volumetric efficiency.
On the other hand, in an external gear pump, the fluid is transferred between two meshing external gears. While external gear pumps are simple and cost-effective, they tend to have lower volumetric efficiency compared to internal gear pumps. This is primarily due to the larger clearances between the gears and the pump housing, which lead to increased internal leakage and reduced efficiency.
The higher volumetric efficiency of internal gear pumps translates into several significant advantages in practical applications. These advantages include:
Improved Overall Efficiency: With its ability to transfer a larger volume of fluid per revolution, an internal gear pump delivers improved overall efficiency. This means that the pump can achieve the desired flow rate with fewer revolutions, resulting in reduced energy consumption and lower operating costs.
Enhanced Pressure Stability: Internal gear pumps offer superior pressure stability due to their improved volumetric efficiency. The minimized internal leakage ensures a more consistent and stable pressure output, allowing for precise control and reliable system operation.
Reduced Wear and Tear: The tighter clearances in an internal gear pump result in reduced wear and tear on the gears and other components. This leads to extended service life, reduced maintenance requirements, and increased reliability, ultimately minimizing downtime and improving productivity.
Enhanced Handling of Viscous Fluids: Internal gear pumps are well-suited for handling viscous fluids, such as oils and lubricants. The positive displacement nature of the pump enables efficient transfer of thick and sticky fluids, ensuring smooth and consistent operation.
Quieter Operation: Due to reduced internal leakage and improved efficiency, internal gear pumps tend to operate with less noise and vibration compared to external gear pumps. This can be particularly advantageous in applications where noise reduction is essential.
It is important to note that while internal gear pumps offer distinct advantages, each type of pump has its own strengths and limitations. Factors such as application requirements, system design, cost considerations, and specific operating conditions should be taken into account when selecting the appropriate pump type.
In conclusion, the main advantage of an internal gear pump over an external gear pump lies in its superior volumetric efficiency. This advantage translates into improved overall efficiency, enhanced pressure stability, reduced wear and tear, enhanced handling of viscous fluids, and quieter operation. By understanding these advantages, hydraulic system designers and operators can make informed decisions to optimize system performance and achieve desired outcomes.
POOCCA hydraulic internal gear pump can replace SUNNY HG, REXROTH PGH, PFG, ECKERLE EIPC, EIPS
Post time: Jul-13-2023
