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LOBE & CIRCUMFERENTIAL PISTON PUMP

Lobe Pump

A lobe pump is a type of positive displacement pump that uses two or more lobed rotors to move fluids. These pumps are known for their ability to handle a wide range of fluid viscosities, including those with particulates, and are commonly used in sanitary applications due to their gentle handling of the fluid and ease of cleaning.

Working Principle

  1. Rotation of Lobes:

    • The lobes rotate in opposite directions.

    • As the lobes come out of mesh, they create expanding cavities on the inlet side, allowing fluid to enter.

  2. Fluid Movement:

    • The fluid is trapped in the pockets between the lobes and the casing.

    • The rotation moves the trapped fluid to the discharge side of the pump.

  3. Discharge:

    • As the lobes mesh on the discharge side, the cavities decrease, pushing the fluid out of the pump.

Key Components

  1. Lobes: The rotating elements, typically shaped like gears with rounded lobes, that move the fluid.

  2. Pump Casing: The outer structure that houses the lobes and defines the flow path.

  3. Timing Gears: Ensure the lobes do not contact each other and rotate in sync.

  4. Shafts and Bearings: Support and align the lobes and timing gears.

Applications

  1. Food and Beverage: Handling of viscous, shear-sensitive, and particulate-laden fluids such as yogurt, sauces, and fruit juices.

  2. Pharmaceuticals: Transfer of sterile and sensitive fluids.

  3. Cosmetics: Pumping lotions, creams, and gels.

  4. Chemical Processing: Moving corrosive and abrasive chemicals.

  5. Wastewater Treatment: Pumping sludge and other waste materials.

Advantages

  1. Gentle Handling: Minimal shear and low pulsation, making them ideal for delicate fluids.

  2. Versatility: Can handle a wide range of viscosities and fluids with particulates.

  3. Sanitary Design: Easy to clean and sterilize, suitable for sanitary applications.

  4. High Efficiency: Consistent performance across a range of operating conditions.

Disadvantages

  1. Cost: Generally more expensive than simpler pump types.

  2. Complexity: Requires precise timing gears and robust design to prevent lobe contact.

  3. Maintenance: Can be more complex and costly to maintain.

Circumferential Piston Pump

A circumferential piston pump, also known as a rotary piston pump, uses piston-shaped rotors that rotate in a cylindrical casing. These pumps are designed for high efficiency and can handle viscous fluids and those containing solids.

Working Principle

  1. Rotation of Pistons:

    • The piston rotors rotate in the pump chamber, maintaining a close clearance but not touching each other or the casing.

    • As the pistons rotate, they create cavities that draw in fluid at the inlet.

  2. Fluid Movement:

    • The fluid is trapped in the cavities between the pistons and the casing.

    • The rotation moves the fluid towards the discharge side.

  3. Discharge:

    • The pistons push the fluid out as they rotate towards the discharge port, creating a consistent flow.

Key Components

  1. Pistons: The rotating elements that create the pumping action.

  2. Pump Casing: The outer structure that houses the pistons and defines the flow path.

  3. Timing Gears: Ensure the pistons do not contact each other and maintain synchronized rotation.

  4. Shafts and Bearings: Support and align the pistons and timing gears.

Applications

  1. Food and Beverage: Handling thick, viscous products such as dough, batters, and cheese.

  2. Pharmaceuticals: Transfer of high-viscosity fluids and sensitive products.

  3. Cosmetics: Pumping creams, pastes, and emulsions.

  4. Chemical Processing: Moving viscous and shear-sensitive chemicals.

  5. Paper and Pulp: Pumping slurries and other thick fluids.

Advantages

  1. High Efficiency: Excellent volumetric efficiency, especially with high-viscosity fluids.

  2. Gentle Handling: Low shear pumping action suitable for sensitive and shear-sensitive fluids.

  3. Versatility: Can handle a wide range of viscosities and fluid types.

  4. Durable: Robust design capable of handling challenging fluids and operating conditions.

Disadvantages

  1. Cost: Generally more expensive than simpler pump designs.

  2. Complexity: Requires precise manufacturing and timing mechanisms.

  3. Maintenance: Can be more complex and costly to maintain, requiring careful attention to timing gears and piston clearances.