Roots vacuum pump is a rotary volumetric vacuum pump. Its structure form is evolved from Roots blower. Its structure and working principle are similar to Roots blower. It first appeared in Germany in . It is used as a mechanical booster pump for vacuum melting system with large pumping speed in the pressure range of 10-Pa.
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Roots vacuum pump classification:
Roots vacuum pump is divided into low vacuum roots vacuum pump with direct air exhaust, medium vacuum roots vacuum pump (mechanical booster pump) and high vacuum roots vacuum pump according to the working pressure range. The largest number of domestic vacuum pumps is vacuum pumps (hereinafter referred to as roots vacuum pumps). Roots vacuum pump is equipped with two rotors which rotate synchronously in opposite directions. There are small clearances between the rotors and between the rotors and the inner wall of the pump shell without contacting each other. The rotor has good geometrical symmetry, so the vibration is small and the operation is stable. There is no need for oil seal and lubrication in the pump chamber, and the friction loss is small. It can greatly reduce the driving power, achieve higher speed, and reduce the pollution of oil vapor to the vacuum system. The structure is simple and compact, and it is not sensitive to the dust and steam in the gas being pumped.
Roots vacuum pump features:
Roots vacuum pump is characterized by fast start-up, low power consumption, low operation and maintenance costs, high pumping speed, high efficiency, in the pressure range of 100-1 Pa has a large pumping rate, can quickly eliminate the sudden release of gas, the speed can be as high as - revolutions / min; pumping rate is 30- liters / sec. This pressure range is just between the oil sealed mechanical vacuum pump and the diffusion pump. Therefore, it is often connected in series between a diffusion pump and an oil-sealed mechanical vacuum pump to increase the pumping capacity of the intermediate pressure range, that is, the mechanical booster pump.
Roots vacuum pump can not be pumped alone. The front stage needs oil seal and water ring to discharge the air directly. That is to say, in practical application, the limit vacuum of Roots vacuum pump depends not only on the pump structure and manufacturing accuracy, but also on the limit vacuum of the front pump. Many customers use a series of Roots vacuum pump in front of the pump just started pumping air set not to start Roots, at this time the Roots effect is not obvious, does not highlight the advantages of Roots vacuum pump. Therefore, the general electronic control set Roots vacuum pump does not start at atmospheric pressure, the current stage pump pumping to a certain limit of vacuum, Roots automatically started. The advantages of Roots vacuum pump as a booster pump will be highlighted, and pump speed will give strong support to the front pump.
Roots vacuum pump as the booster pump of the front-stage pump, selection should follow the Roots pumping speed than the front-stage pump pumping speed at least twice but not more than 10 times the range of choice. Pumping speed than the same stage or smaller than the previous pump, Roots pump appears “no power”, not really put to use; Pumping speed is 10 times faster than the previous pump or more, the load of the pump is relatively increased, the wear of the pump is large, can not actually save energy Roots effect, is also undesirable. Roots vacuum pump is used to control the flow rate and head of roots pump within the range indicated on the sign to ensure that the roots pump operates at the highest efficiency point and achieves the greatest energy-saving effect.
Roots vacuum pump application:
Roots vacuum pump is widely used in vacuum metallurgy smelting, degassing, rolling, chemical, food, pharmaceutical industries, such as vacuum distillation, vacuum concentration and vacuum drying.
(The article comes from the Internet. If reprinting is not allowed, please contact our company to delete it.)The RUVAC WH will help to make your process more reliable and cost efficient.
RUVAC WH Roots pumps attain the highest pumping speeds and best ultimate pressures with maximum safety in combination with dry compressing vacuum pumps from the DRYVAC, SCREWLINE, and LEYVAC line, or the oil-sealed vacuum pumps of the SOGEVAC line.
The RUVAC WH line includes a number of engineering innovations ensuring a long service life with minimum maintenance complexity.
Water cooling advantages
The concept of the hermetically sealed, water cooled motor permits optimum cooling resulting in a very high motor efficiency. Water cooling at the motor permits extreme high motor loads and at the same time high protection against overloads. Apart from a reduced pumpdown time, noise and heat emissions are reduced and the pump is therefore cleanroom compatible. Moreover, water cooling significantly reduces the oil temperature, resulting in improved lubricating properties thereby guaranteeing a long service life for the bearings.
System integration, made easy
The smart design of the pumps with their reduced exhaust flange permits the configuration of different pump combinations without an additional mounting frame. Since the pumps are connected to each other only with an adapter, both investment costs and as well as the system‘s footprint are reduced significantly.
Even faster with bypass line
The RUVAC WHU line was developed for extremely fast pumpdown of loadlock chambers, for example. The utilization of a patented bypass line permits a high additional pumping speed starting at atmospheric pressure thereby significantly reducing pumpdown time. This is significantly faster compared to the utilization of a frequency converter since the pump mechanically controls the pumping speed at full speed of the pump.
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No shaft seal, the pump is hermetically sealed
Therefore no shaft seal is needed. This prevents oil leaks and increases safety significantly while pumping sensitive media.
Motor ensures a long service life
The integration of a potted water cooling facility protects the motor against external and internal influences. The lower operating temperature compared to air-cooled motors in combination with the built-in coil protection ensures a long service life. When using the recommended lubricant, the pump will operate for 4 years without any service needed.
Frequency converters optimize the performance
RUVAC WH pumps deliver best performance due to the specially matched frequency converter. The integrated frequency converter optimizes the necessary power consumption and provides the required pumping speed for the variants RUVAC WH FC, RUVAC WHU and RUVAC WH 700. Moreover, it protects the Roots pump against thermal overloads, thereby rendering it intrinsically safe.
Using a frequency converter enables the RUVAC WH to support the backing pump in starting at atmospheric pressure. Increasing the rotational speed results in an enhanced pumping speed even at low pressures. This leads to very short pumpdown times and a high process gas throughput.
Advantages
Increased process gas throughput due to significantly enhanced rotational speed
Reduced pumpdown time due to operation starting at atmospheric pressure in connection with increased pumping speed at dropping pressures
Highest operational reliability through parameter matching to the thermal limit of the pump
Pump protection in the event of a cooling water failure through processing the signal of a thermal sensor
Saving of power through optimized motor utilization at the operating point
Energy saving by reducing the speed during standby operation
Flexible matching to the requirements of your specific vacuum application
Easy electrical integration through digital and analog interfaces; industrial bus systems are optionally available
The frequency converter contributes significantly to increased reliability at a favourable price-to-performance ratio.
Application flexibility
The RUVAC WH line offers its advantages in all vacuum applications. It excels through extreme ruggedness and durability thereby meeting the requirements of industrial applications. At the same time it fulfills the requirements of solar and coating processes where lowest life-cycle costs, highest system availability and low emissions are required.
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