1. What is Gear Pump Displacement?

Gear pump displacement refers to the volume of fluid displaced per revolution of the pump shaft. It is a fundamental parameter that determines the pump's flow capacity and is typically measured in cubic centimeters per revolution (cc/rev).

2. How Does the Calculator Work?

The calculator uses the displacement formula:

Where:

• \( Displacement \) — Pump capacity per revolution (cc/rev)
• \( Flow \) — Fluid flow rate (L/min)
• \( RPM \) — Pump rotational speed (rev/min)

Explanation: The formula calculates how much fluid volume the pump moves with each complete rotation, which is essential for pump selection and system design.

3. Importance of Displacement Calculation

Details: Accurate displacement calculation is crucial for proper pump sizing, system efficiency optimization, and ensuring the pump meets the required flow demands at specific operating speeds.

4. Using the Calculator

Tips: Enter flow rate in liters per minute (L/min) and rotational speed in revolutions per minute (RPM). All values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between displacement and flow rate?
A: Displacement is the volume per revolution (cc/rev), while flow rate is the volume per unit time (L/min). Flow rate equals displacement multiplied by RPM.

Q2: Can I use different units for flow and RPM?
A: Yes, but ensure consistent units. For gpm instead of L/min, convert appropriately (1 L/min ≈ 0.264 gpm).

Q3: What are typical displacement values for gear pumps?
A: Gear pump displacements typically range from 0.1 cc/rev for small pumps to over 200 cc/rev for large industrial pumps.

Q4: How does displacement affect pump performance?
A: Larger displacement pumps deliver more flow at the same RPM, but require more torque and power to drive.

Q5: Is this calculation valid for all pump types?
A: This formula works best for positive displacement pumps like gear pumps. For centrifugal pumps, different calculations apply.