1. What is Internal Gear Pump Displacement?

Internal gear pump displacement represents the volume of fluid displaced per revolution of the pump. It's a critical parameter for determining the flow rate and sizing hydraulic systems.

2. How Does the Calculator Work?

The calculator uses the displacement formula:

Where:

• \( D_{o\_int} \) — Outer diameter of the gear (inches)
• \( D_{i\_int} \) — Inner diameter of the gear (inches)
• \( W_{int} \) — Width of the gear (inches)
• \( \pi \) — Mathematical constant (approximately 3.1416)

Explanation: The formula calculates the annular area between the outer and inner diameters and multiplies it by the gear width to determine the displacement volume per revolution.

3. Importance of Displacement Calculation

Details: Accurate displacement calculation is essential for proper pump selection, system design, and predicting flow rates in hydraulic systems. It helps ensure the pump meets the required performance specifications.

4. Using the Calculator

Tips: Enter all dimensions in inches. Ensure outer diameter is larger than inner diameter. All values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What units should I use for the inputs?
A: All dimensions should be entered in inches for consistent results.

Q2: Why is the displacement measured in cubic inches per revolution?
A: This unit indicates the volume of fluid the pump can move with each complete rotation of the gear.

Q3: Can I use this calculator for external gear pumps?
A: No, this formula is specifically designed for internal gear pumps which have a different geometry.

Q4: What if my inner diameter is larger than the outer diameter?
A: The calculation requires that the outer diameter is larger than the inner diameter. Please verify your measurements.

Q5: How accurate is this calculation for real-world applications?
A: This provides a theoretical displacement. Actual performance may vary due to manufacturing tolerances, efficiency losses, and fluid properties.