Specifications JZJS roots vacuum set is made up of the series connected roots pump and liquid ring pump, where the roots pump is the main pump and the water ring pump is used as the backing pump. It overcomes the ultimate pressure difference when using a single liquid ring pump compared with the liquid ring pump, the ultimate pressure of the unit is greatly improvedand the low pumping rate under a certain pressure, at the same time, retaining the advantage of the fast work and higher pumping rate of the roots pump. In particular, it is adapt to pump a great amount of condensable vapors.
Liquid usually water is fed into the pump and, by centrifugal acceleration, forms a moving cylindrical ring against the inside of the casing. This liquid ring creates a series of seals in the space between the impeller vanes, which form compression chambers.
The eccentricity between the impeller's axis of rotation and the casing geometric axis results in a cyclic variation of the volume enclosed by the vanes and the ring. Gas, often air, is drawn into the pump through an inlet port in the end of the casing.
The gas is trapped in the compression chambers formed by the impeller vanes and the liquid ring. The reduction in volume caused by the impeller rotation compresses the gas, which reports to the discharge port in the end of the casing.
Compressed gas on discharge of pump contains certain amount of working liquid which is usually removed in vapor—liquid separator. History[ edit ] The earliest liquid-ring pumps date fromwhen a patent was granted in Germany to Siemens-Schuckert.
US Patent 1,, for liquid-ring vacuum pumps and compressors, was granted to Lewis H. Around the same time, in Austria, Patent was granted to Siemens-Schuckertwerke for a similar liquid-ring vacuum pump.
Types and Applications[ edit ] Single-stage vacuum pump in bioethanol plant Liquid-ring systems can be single- or multistage. Typically a multistage pump will have up to two compression stages on a common shaft.
In vacuum service, the attainable pressure reduction is limited by the vapour pressure of the ring-liquid. As the generated vacuum approaches the vapour pressure of the ring-liquid, the increasing volume of vapor released from the ring-liquid diminishes the remaining vacuum capacity.
The efficiency of the system declines as a result. Single-stage vacuum pumps typically produce vacuum to 35 Torr mm Hg or 47 millibars 4. Recirculation of ring-liquid[ edit ] Some ring-liquid is also entrained with the discharge stream.
This liquid is separated from the gas stream by other equipment external to the pump. In some systems, the discharged ring-liquid is cooled by a heat exchanger or cooling towerthen returned to the pump casing.
In some recirculating systems, contaminants from the gas become trapped in the ring-liquid, depending on system configuration. These contaminants become concentrated as the liquid continues to recirculate, eventually causes damage and reduced life to the pump.
In this case, filtration systems are required to ensure that contamination is kept to acceptable levels. In non-recirculating systems, the discharged hot liquid usually water is treated as a waste stream.
In this case fresh cool water is used to make up the loss.
Environmental considerations are making such "once-through" systems increasingly rare. These simple, but highly reliable pumps have a variety of industrial applications.
They are used to maintain condenser vacuum on large steam-turbine generator sets by removing incondensable gasses, where vacuum levels are typically 30—50 mbar. They are used on paper machines to dewater the pulp slurry and to extract water from press felts.
Another application is the vacuum forming of molded paper-pulp products egg cartons and other packaging. Other applications include soil remediation, where contaminated ground water is drawn from wells by vacuum.
In petroleum refining, vacuum distillation also makes use of liquid-ring vacuum pumps to provide the process vacuum. Liquid-ring compressors are often used in vapor recovery systems.
Liquid type[ edit ] Liquid-ring vacuum pumps can use any liquid compatible with the process, provided it has the appropriate vapor pressure properties, as the sealant liquid. Although the most common sealant is water, almost any liquid can be used. The second most common is oil.Vacuum Pumps Pioneers in the industry, we offer high capacity low vacuum pumps, two stage liquid ring vacuum pumps, single stage vacuum pumps, single stage monoblock vacuum pumps, dry screw vacuum pump and cone vacuum pump from India.
The Ws+ employs a built in eccentric air screw to form the liquid ring required for its self-priming capability. % more efficient than other liquid rings due to improved fluid flow through pump.
Performance optimised by matching impeller size to duty. Liquid ring vacuum pumps are capable of handling non-condensable gas with high volumes of vapours, condensable and liquids. Pump service liquid can be water or other liquids such as oils or solvents to satisfy almost any process requirement.
Model PNS 1- 0 2 PORTABLE LIQUID PUMP AND FILTER SYSTEMS DESCRIPTION Filtration Systems Portable Liquid Pump & Filter Systems are designed to pump. The liquid ring vacuum pump is manufactured to handle liquid, water, gas and air movement applications in various industries.
We design vacuum pumps based on widely acclaimed liquid ring technology to offer high end transfer solutions in industries. A liquid ring “pump” is NOT A PUMP. It is a rotating, positive displacement gas or vapor compressor that is used to transport gases or vapors or to compress them.
In the process of transporting the gases or vapors, it can act as a vacuum “pump” (which is a gross misnomer) and .