Diaphragm & Screw Pumps,  Diaphragm Pumps,  Screw Pumps

Diaphragm & Screw Pumps

November 4, 2016 /

DIAPHRAGM PUMP AND SCREW PUMPS

DIAPHRAGM PUMP

In a diaphragm pump, a type of positive displacement pump, a fixed amount of fluid is displaced by a flexible diaphragm. The diaphragm, made of rubber, plastic, or Teflon, moves reciprocally to create suction and discharge pressures. This pump type is typically used for pumping liquids with high viscosity, suspended solids, or abrasive materials. It is widely utilised in various industries, including food production, chemical processing, and wastewater treatment.

DIAPHRAGM PUMP

The working principle of a diaphragm pump is based on the reciprocating action of a flexible diaphragm to create a pumping movement. The diaphragm separates the fluid pumped from the pump’s mechanical parts, ensuring the liquid remains contamination-free.

The rigid central plate, to which a flexible rubber, thermoplastic, flexible rubber, thermoplastic, or elastomer material diaphragm is typically mounted on the wooden main dish, which is connected to a reciprocating shaft driven by a motor or other power source., is connected to a reciprocating shaft driven by a motor or other power source.

As the shaft moves back and forth, the diaphragm flexes, creating a vacuum in the pump chamber. This causes the fluid to be drawn into the pump chamber through the inlet valve. When the shaft reverses direction, the diaphragm flexes in the opposite direction, forcing the liquid out of the pump chamber through the outlet valve.

The operation of a diaphragm pump can involve either a single diaphragm or multiple diaphragms connected in series or parallel. Using various diaphragms can increase the flow rate, and the reliability can be significantly improved, as each diaphragm can compensate for the failure of another.

Liquids. Diaphragm pumps have versatility. Diaphragm pumps can handle a broad spectrum of fluids, such as abrasive, viscous, and corrosive liquids. They are utilised in various industries, such as chemical processing, pharmaceuticals, food and beverage, and wastewater treatment.

Diaphragm pumps have several benefits, including:

  1. Versatility: Diaphragm pumps can handle various fluids, including abrasive, viscous, and corrosive liquids. This pump type finds application across multiple industries, including chemical, pharmaceutical, food and beverage, and wastewater treatment. 
  2. Contamination-free: The pumped fluid is guaranteed to remain uncontaminated throughout the pumping process by the engineering of diaphragm pumps. The diaphragm separates the juice from the pump’s mechanical parts, reducing the risk of contamination.
  3. Self-priming: Diaphragm pumps are self-priming, so they can start pumping without needing external priming. Diaphragm pumps are ideal for applications where the pump must be created and stopped frequently.
  4. Low maintenance: Diaphragm pumps have few moving parts and are easy to maintain. Lubrication is not required, and replacement of the diaphragm when worn is easy for them.
  5. Energy-efficient: Diaphragm pumps require less power than other pumps to achieve the same flow rate. These pumps can result in lower energy costs and a smaller environmental footprint.

The benefits of diaphragm pumps make them a popular choice for many pumping applications, mainly where fluid contamination is a concern.

SCREW PUMP

A screw pump is a positive displacement pump that uses one or more rotating screws to move fluid through the pump. The screws are typically metal and have helical grooves that create cavities between the screws and the pump housing. As the screws rotate, the holes move fluid from the inlet to the pump outlet. Screw pumps are known for their high efficiency and ability to handle various fluids with different viscosities. The oil and gas industry, food processing, and wastewater treatment are common industries that frequently utilise this pump type.

SCREW PUMP OPERATIONAL DIAGRAM

WORKING PRINCIPLE OF A SCREW PUMP

The working principle of a screw pump is based on the movement of two or more helical rotors, typically made of metal, that rotate inside a cylindrical chamber. The rotors move fluid from the inlet to the outlet of the pump by trapping and transporting the liquid in the spaces between the rotor and the cylinder walls.

As the rotors rotate, they create a void or low-pressure zone at the inlet end of the pump, which causes the fluid to flow into the pump. The juice is then trapped between the rotors and the cylinder walls, and as the rotors continue to rotate, the liquid is carried along the pump’s length.

As the fluid moves along the pump, the spaces between the rotors and the cylinder walls decrease, causing the fluid to be compressed and pressurised. This pressure forces the liquid out of the outlet of the pump.

Screw pumps can be designed with different rotor configurations, including single-screw, twin-screw, and triple-screw designs. They can handle fluids with various viscosities, from low-viscosity liquids to high-viscosity oils and sludges.

Screw pumps are widely used in many industries, including chemical processing, oil and gas, food and beverage, and wastewater treatment, due to their ability to handle a wide range of fluids with high efficiency, low pulsation, and low noise levels.

Screw pumps have several benefits, including:

  1. High efficiency: Screw pumps are highly efficient, with a constant flow rate that is not affected by changes in viscosity. They can handle fluids with various viscosities, from low-viscosity liquids to high-viscosity oils and sludges.
  2. Low pulsation: Screw pumps are ideal for pumping shear-sensitive liquids like food products, cosmetics, and pharmaceuticals, as their low-vibration operation reduces the risk of liquid damage.
  3. Self-priming: Applications, where the pump must be frequently started and stopped, are ideal for screw pumps since they can begin pumping without external priming, being self-priming.
  4. Low noise: Screw pumps operate with low noise levels, making them suitable for applications where noise pollution is a concern.
  5. Low maintenance: Screw pumps have few moving parts and are easy to maintain. They do not require lubrication and have a long service life.
  6. Versatility: Various applications, such as chemical processing, oil and gas, food and beverage, and wastewater treatment, can use screw pumps.

Overall, the benefits of screw pumps make them a popular choice for many pumping applications, mainly where high efficiency, low pulsation, and low maintenance are important factors.

 

 

 

 

Sumit Marathe is an experienced engineer passionate about pumps and pumping equipment. He has worked in the industry for several years, gaining valuable knowledge and expertise in designing, installing, and maintaining various types of pumps. Sumit's passion for pumps and pumping equipment led him to start his blog, which focuses on providing in-depth information and insights into the latest trends and innovations in the industry. His blog covers many topics related to pumps and pumping equipment, including the different types of pumps, their applications, and their maintenance. Sumit's blog is a valuable resource for anyone who wants to learn more about pumps and pumping equipment. His articles are well-researched and provide a detailed analysis of the subject matter. Sumit also uses his blog to share his experiences and insights, giving readers a unique perspective on the industry. Sumit has become a respected voice in the world of pumps and pumping equipment through his blog. His dedication to the industry and his commitment to sharing his knowledge with others have made him a valuable resource for engineers, technicians, and anyone else who works with pumps regularly.

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