A rotary vane pump is a positive-displacement pump consisting of a vane mounted to a rotating rotor in a cavity. In some cases these vanes may have variable length and/or tension to maintain contact with the wall when the pump is rotating. Created by Charles C. Barnes of Sackville, New Brunswick, who patented it on June 16, 1874. There are various improvements, including variable vane pumps for gas (1909)
Video Rotary vane pump
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The simplest vane pumps have circular rotors that rotate inside larger circular cavities. The centers of these two circles are offset, causing eccentricity. The propellers are allowed to slide in and out of the rotor and seal on all sides, creating a propeller chamber that does the pumping work. On the side of the pump intake, the propeller chamber increases in volume. This growing space of propellers is filled with fluid forced by inlet pressure. The inlet pressure is actually the pressure of the pumped system, often just the atmosphere. On the discharge side of the pump, the vane chamber has decreased in volume, forcing the liquid out of the pump. The action of the propeller dissipates the same volume of fluid with each rotation. Multistage rotary-vane vacuum pumps can achieve DROP pressure as low as 10 -6 mbar (0.0001 Pa).
Maps Rotary vane pump
Usage
Vane pumps are commonly used as high-pressure and in-car hydraulic pumps, including supercharging, power-steering, air conditioning, and automatic transmission pumps. Pumps for mid-range pressure include applications such as carbonators for fountain soft drink dispensers and espresso coffee machines. Furthermore, the vane pump can be used in low pressure gas applications such as secondary air injection for automatic exhaust emissions control, or in low pressure chemical vapor deposition systems.
Rotary vane pump is also a common type of vacuum pump, with a two-stage pump capable of reaching a pressure below 10 -6 bar. These vacuum pumps are found in various applications, such as providing braking assistance on large trucks and diesel-powered passenger cars (whose engines do not produce vacuum intake) through braking amplifier, in most light aircraft to drive giroscopic flight instruments, in emptying the line refrigerant during AC installation , in laboratory freezing dryers, and vacuum experiments in physics. At the propeller pump, the gas is pumped and the oil is mixed inside the pump, so they must be separated externally. Therefore, the inlet and outlet have large spaces, perhaps with vortices, where drops of oil fall from the gas. Sometimes the inlet has a venetian blind cooled by room air (pumps are usually 40 K hotter) to condense pump oil and cracked water, and let it fall back into the inlet. When these pumps are used in high vacuum systems (where the entry of gas into the pump becomes very low), a significant concern is the contamination of the entire system by the backstreaming of molecular oils.
Variable displacement vane pump
One of the main advantages of a propeller pump is that it is easily suited to be a variable-displacement pump, rather than a fixed-displacement pump such as a spur-gear (X-X) or gerotor (I-X) pump. The center distance from the rotor to the eccentric ring is used to determine the displacement of the pump. By allowing the eccentric ring to rotate or translate relative to the rotor, the displacement can be varied. It is even possible to pump the propeller pumping upside down if the eccentric ring moves far enough. However, performance can not be optimized for pumping in both directions. This can create a very attractive hydraulic pump oil pump.
A variable vane propeller pump is used as an energy saving device and has been used in many applications, including automotive transmission, for over 30 years.
Materials
- External (head, casing) - cast iron, ductile iron, steel, and stainless steels.
- Vane, pushrods - carbon graphite, PEEK.
- End plate - carbon graphite
- Razor blades - mechanical seal components, industrial standard cartridge mechanical seal, and * magnetically actuated pumps.
- Packaging - available from multiple vendors, but usually not recommended for thin fluid services
See also
- Guided rotor compressor
- Superplarger Powerplus
References
External links
- Description and animation of the propeller pump
- US. Patent from Vane Pump
- H. Eugene Bassett's articulation transfer compressor
Source of the article : Wikipedia
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