Gear Pump

Overview: A gear pump is a common type of positive displacement pump that primarily uses the meshing of gears to transport fluids. Its operating principle can be divided into the following steps:
1. Suction Process:
- The gear pump consists of two meshing gears: a driving gear and a driven gear. When the driving gear is rotated by an external power source (such as a motor), it drives the driven gear to rotate as well.
- As the gears rotate, at the inlet, the gears gradually disengage from each other, creating an increasingly larger cavity between the gears and the pump casing.
- The expansion of the cavity reduces the pressure at the inlet, forming a partial vacuum. The external fluid is then pushed into the pump chamber by atmospheric pressure or other means, entering the cavity.
2. Transport Process:
- As the gears continue to rotate, the fluid is trapped in the spaces between the gear teeth and the pump casing, and is carried toward the outlet.
- During this process, the fluid is continuously transported along the inner wall of the pump casing from the inlet to the outlet.
3. Discharge Process:
- When the gears begin to re-mesh at the outlet, the cavity between the gears decreases.
- The fluid is then squeezed out by the gears, entering the outlet, completing the transport process.
Characteristics
- Simple Structure: The gear pump has a relatively simple structure, mainly composed of gears, a pump casing, and bearings.
- Stable Transport: Due to the continuous meshing and discharge of the gears, the fluid is transported smoothly.
- Strong Self-Priming Ability: Gear pumps have good self-priming capabilities, allowing them to automatically draw in liquid during startup.
- Wide Range of Applications: Gear pumps can transport fluids of various viscosities, including oil, water, and chemicals.
Applications
Gear pumps are widely used in fields such as petrochemicals, food processing, hydraulic systems, and lubrication systems. They are particularly suitable for transporting high-viscosity and well-lubricated liquids.
Conclusion: In summary, the gear pump achieves the suction, transport, and discharge of fluids through the continuous meshing and rotation of gears. It offers advantages such as a simple structure, stable transport, and strong adaptability.

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