The Vane Pump Manufacturers briefly introduced the van […]
The Vane Pump Manufacturers briefly introduced the vane pump, including common types and how they work. For more information on related products, please visit: https://www.xjetl.com
rotary vane pump
The rotary vane pump is a positive displacement pump that can handle lubrication and other low viscosity fluids at low pressures in low to medium volumes, and in some applications can handle relatively viscous fluids. This design, sometimes referred to as a carbonator pump, is used to make carbonated soft drinks and has traditionally been used in automotive applications. They have the ability to form a good vacuum and are commonly used to transfer LNG and certain solvents. Their various arrangements are described here, and their operation and common applications are discussed. For information on other pumps, please see our Pump Buyer's Guide.
Sliding vane pump
These pumps combine an eccentric ring with a grooved rotor. The slot houses the vanes that are radially movable as the rotor rotates in the ring. As the blades rotate around the suction port, they move outwardly to form a volume defined by the continuous blades, rotor and ring walls. This volume draws in fluid and is then sealed as it passes through the suction port. On the discharge side, the combination of the ring and the rotor eccentrically pushes the blade into the groove, thereby reducing the volume and forcing the fluid to flow out through the discharge port. The suction and discharge ports or kitchen are usually kidney-shaped and filled from the side.
The blades are typically made of carbon graphite to minimize wear when handling low lubricity fluids. Centrifugal and fluid pressure are common methods of extending the blade outward to the annulus, but effective extension methods such as rods are used in some designs. The blades themselves compensate for wear and most of the designs make blade replacement easy, resulting in low maintenance costs for the vane pump.
Another design employs a pivoting vane that swings outwardly under the action of centrifugal force to form a volume that decreases as they pass through the discharge port. An external vane pump is also produced.
The vane pump can be a fixed output design or can be made to change the eccentricity between the rotor and the ring. This allows variable rate control via a constant input rpm. Pressure compensated pumps are used in many fluid power applications.
Flexible vane pump
Like a vane pump, a flexible sheet pump relies on an eccentric motion generated between the rotating rotor and the retaining ring to move fluid between the suction port and the discharge port. However, the flexible vane pump replaces the slot and the rigid vane, but instead employs a vane molded from a flexible material that deforms when the rotor forms a loop. This creates a cavity that expands on the suction side and collapses on the discharge side. This design is very useful for moving fluids containing particles or solids because there is no possibility of internal clearance of these particles. The impeller is made from a variety of rubber blends including EPDM and silicone and is compatible with a wide range of products. Flexible vane pumps are considered to be low shear.
As previously mentioned, the soda dispenser uses a vane pump to deliver water to a pressurized CO2 storage tank. Commercial espresso machines also use them to force hot water through a dense espresso grinder. The vane pumps are considered to be differential pressure pumps, which means that they can pressurize the fluid entering the pump suction port at a pressure above atmospheric pressure, just like a espresso machine that delivers hard pipes to the water supply system. Household espresso machines typically use cheaper piston pumps that are designed to absorb water from the built-in water tank.
Automakers use vane pumps to pressurize low-viscosity hydraulic fluids found in power steering systems, for which the original Vickers pump was developed. They are used both as fixed output units and as variable output units in automatic transmissions. The vane pump is best suited for low viscosity fluids that do not contain particles. An external vane pump is sometimes used to treat fluids containing solids.
Slide pumps are commonly used in refineries, docks, etc. for pumping oil, solvents, paints and coatings. Rotary vane technology is applied to hand pumps for manual conversion and similar operations. In recent years, micro-hydraulic systems for personal assist devices have created a need for miniature rotary vane pumps.
Flexible vane pumps are widely used in food, beverage and pharmaceutical services because of their low shear design that allows them to move cosmetics and similar creams without affecting their quality or pumping solid (eg yogurt) liquids without Cause damage. The low shear design is also suitable for the production of marine bilge pumps and water-based glue. Flexible vane pumps produce only low to moderate pressures, and material viscosity plays a role in how high the pressure can be.
Flexible vane pumps have excellent self-priming properties and can be used for tank stripping and similar operations without the need for valves or manual oiling. They are also reversible, making them easy to clean the intake lines of high viscosity products. Flexible vane pumps offer a relatively low cost solution for pumping solids and shear sensitive products, rather than other low shear designs such as rotary vane pumps.
The outer casing can be made of stainless steel for sanitary service or made of bronze for marine service, but due to its self-lubricating properties, ductile iron is used where possible. These pumps have both sealed and sealed magnetic coupling units. The vane pump is between the economical gear pump and the expensive piston pump.
Finally, while rotary displacement pumps are capable of pumping water, their primary application is for oils and viscous liquids because of the need to maintain lubrication of the friction surfaces and to seal very thin fluids. For most applications where water is the medium, centrifugal or dynamic displacement, the pump is a clearer choice. The vane pump works well with low viscosity fluids, and in several specific applications mentioned here, the vane pump can pump water to moderate pressure.
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