Dry Screw Vacuum Pump Application

Dry Screw vacuum pump is widely used to transport milk, beer and some emulsifiable liquids because it has the characteristics of no disturbance and small pulsation in the process of conveying medium. Because of this characteristic, it is also widely used in the oil-water separation device of wastewater treatment system, making the oil in wastewater not easy to emulsify, easier and cleaner to be separated, which is superior to the plunger pump currently used more. It must be pointed out that when used in food, medicine and other fields, pumps must comply with the strict hygiene regulations. The stator must be made of non-toxic and odorless rubber, the parts in contact with the conveying medium should not be corroded, the flow passage in the inner space of the pump should be smooth, and the flow and drift without disassembly can be used to wash out, so as to ensure that there is no residue and bacteria in the pump. However, even if the non-toxic and odorless rubber stator is used, its abrasive debris will inevitably still be mixed into the medium of transportation, which is not suitable for the quality of food and medicine, from the point of view of environmental requirements.

Dry Screw vacuum pump can realize Multiphase Transportation of liquid, gas and solid, which is impossible for most other pumps, so it has great significance. It can also be used as a metering pump with various chemical additives. The metering accuracy is quite reliable and can reach 98%. Compared with other types of pumps, screw vacuum pumps have strong self-priming ability. Usually, the suction height of medium is as high as 6m, and for some medium, it can reach as high as 8.5m at some rotational speeds, which also widens its application field.

The Dry screw vacuum pump is used late in naval ships. The oil-water separating device for the treatment of bilge oil pollution system (flow rate is usually less than 10 rri3/1i, discharge pressure is about 0.2 MPa, rotational speed is generally about 200 r/min), sewage treatment device and waste incinerator system are used as transporting pumps, and the micro single screw pump is mostly used in the fecal incineration system (speed drop is 50-60 r/m). In this case, the flow rate is 1L/m in, the discharge pressure is about 0.2MPa, and the suction height is about 2m. These pumps have a long life because of their low speed. In addition, there are also used as residue pumps, bilge pumps, seawater pumps, deck flushing pumps and cargo oil pumps, which are usually used in low pressure and small flow conditions.

The single Dry screw vacuum pump was first developed abroad in the early 1970s, and has been widely used in Russia, the United States, Canada, France and other countries. Since 1990s, China began to use ground-driven single screw pump to produce oil. At present, most of them still rely on imports. In China, only high viscosity crude oil accounts for more than 1/6 of the total reserves, and beam pumping system can be replaced in shallow, deep, low-yield, remote and heavy oilfields. Electric submersible single screw pump is another development trend of rodless oil recovery. Therefore, single screw pump oil recovery is a field with great development space and application value, and will produce good economic benefits.

Comparing the Dry screw pump production system with the beam pumping plunger pump production system, the oil production increased by 6.4 times and the pump efficiency reached 76%-87%. Although the test shows that the single screw pump oil production system driven by surface hydraulic pressure is not convenient to use in the cold climate of northern China. However, the advantages of screw pump oil recovery still have high economic benefits, which is a new type of pumping equipment worthy of popularization and application.

Vacuum pump manufacturers EVP  dry screw vacuum pump is relatively easy, cheap and widely applicable, so it is very competitive.

Dry Screw Vacuum Pump Application

LG Series Screw Vacuum Pump

Model Unit LG50 LG70 LG100 LG150 LG200 LG300 LG350
Suction Capacity 50 Hz m³/hr 180 250 360 540 720 1080 1260
60 Hz 216 300 430 650 850 1296 1512
Ultimate Pressure 50 Hz mbar 0.02
60 Hz 0.01
Motor power 50 Hz Kw 5.5 7.5 11 15 18.5 22 22
60 Hz 7.5 11 15 15 22 26 26
Rotary Speed 50 Hz RPM 2900
60 Hz 3550
Inlet diam mm 50 65 70 90 100 100 100
Outlet diam mm 40 40 55 65 65 65 65
Lubricating oil consumption L 0.85 0.85 1.4 2 2 2 2
Cooling water consumption L/min 2.5 2.6 2.8 3 4 4 4
gal/min 0.67 0.7 0.75 0.8 1.07 1.07 1.07
Weight Kg 295 350 480 520 680 850 850
Noise dB(A) 68 70 70 72 74 84 84
Working temperature 5~40
Max. Permissible humidity / 90%

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