Small air-cooled screw vacuum pump

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Introduction to dry air-cooled screw vacuum pump Overview General vacuum systems cannot meet the requirements of clean, oil-free and corrosion-resistant. A large number of oil-containing vacuum systems have been replaced by oil-free and clean vacuum systems. Dry, oil-free, clean and environmentally friendly vacuum products will accelerate the replacement of water ring pumps, water jet vacuum pumps, reciprocating pumps, and oil-sealed mechanical pumps. The screw vacuum pump is a non-contact dry pump. It is an ideal vacuum pump that appeared in the early 1990s. It has the advantages of wide pumping speed range, simple and compact structure, frictionless pumping chamber components, long life, low energy consumption, and no oil pollution. The screw vacuum pump is a working chamber composed of a pair of parallel spiral rotors and a pump body. There is no friction and a certain gap between the rotors and the pump body. A sealed cavity is formed between the two rotors and the pump body. When the rotor rotates, the gas in the sealed cavity is continuously squeezed to the exhaust port for discharge. Because the screw vacuum pump does not require oil lubrication or water sealing, and there is no oil in the pump chamber, the screw vacuum pump is an oil-free dry vacuum pump. It has incomparable advantages in situations requiring oil-free cleanliness in the semiconductor and electronics industries, as well as in solvent recovery processes in chemical and pharmaceutical industries. It is an updated product of reciprocating pumps, water ring pumps, water jet vacuum pumps, oil-sealed slide valve vacuum pumps, rotary vane vacuum pumps, and Roots units. Scope of use ① Electrician: Transformers, transformers, epoxy resin vacuum casting, capacitor vacuum oil impregnation, vacuum pressure impregnation. ② Chemical, pharmaceutical: Product distillation, drying, degassing, concentration, and material transportation. ③ industrial furnace: Vacuum brazing, vacuum sintering, vacuum annealing, vacuum pressurized gas quenching, vacuum dehydroxylation, etc. ④ Vacuum coating: Vacuum evaporation coating, vacuum magnetron sputtering coating, film winding continuous coating, ion plating, etc. ⑤ metallurgy: Special steel smelting, vacuum induction furnace, vacuum desulfurization, degassing. ⑥ aviation, aerospace: Vacuum simulation tests such as spacecraft orbital module, return module, rocket attitude adjustment module, spacesuit, astronaut space exit, aircraft liftoff, etc. ⑦ dry: Variable pressure vacuum drying, kerosene gas box drying, wood drying, vegetable freeze drying, etc. ⑧ Electronics industry, semiconductor industry. Structural Principle: Screw oil-free mechanical vacuum pump, also known as dry screw vacuum pump, uses gear transmission to synchronously reversely rotate the intermeshing and non-contact left and right screws to rotate at high speed. The pump casing and the intermeshing spirals are used to separate the spiral grooves into multiple spaces and form multiple stages. The gas is transmitted in each equal groove, but there is no compression. Only the spiral structure at the end of the screw has a compression effect on the gas. The variable pitch screw vacuum pump performs step-by-step compression inside the pump chamber. A pressure gradient can be formed between the various stages of the screw to disperse the pressure difference and increase the compression ratio. The clearance between various parts and the pump speed have a great influence on the performance of the pump. When designing the clearance between various parts of the screw, consider expansion, processing and assembly accuracy, and the working environment (such as the extraction of dust-containing gases). Like the Roots vacuum pump, this pump does not have an exhaust valve. There is no oil in the pump chamber, no pollution to the vacuum system, which is conducive to exhaust gas recovery and is environmentally friendly. One lead of a screw vacuum pump is equivalent to a first-stage pump, and a screw vacuum pump with multiple leads is equivalent to a multi-stage pump in series. The inhaled gas is stably pressurized higher than the gas pressure at the discharge. The power of the motor is transmitted to the driving shaft through the coupling, and the main rotating shaft is transmitted to the driven shaft through a proportional gear. Performance characteristics①: The dry air-cooled screw vacuum pump is a new cost-effective vacuum pump developed by our company based on many screw vacuum pumps at home and abroad and using advanced processing technology to independently innovate. It has the advantages of high efficiency, energy saving, environmental protection, light weight, easy use, reliable performance, etc. This vacuum pump represents the future development direction of our company. ②: The initial vacuum degree is high (generally, water-cooled screw pumps have a low initial vacuum degree, and it takes a long time to pump to reach the ultimate vacuum). ③: The screw adopts high-precision and advanced processing technology. ④: Environmentally friendly, oil-free, water-free and pollution-free, a clean vacuum can be obtained, and the pumped materials can be recycled. ⑤: Energy saving, the screw adopts multi-stage variable pitch energy-saving technology, which can reduce energy consumption by 30%-50%. ⑥: It has a corrosion-resistant protective layer (cannot be used in strong acid and alkali situations). ⑦: It adopts air-cooling structure, making it more convenient and simple to use. ⑧: The ultimate vacuum is high, reaching 3Pa, the working area is wide, and it can operate continuously from atmospheric pressure to ultimate vacuum. ⑨: Reliable sealing structure, using stainless steel double-lip shaft seal (PTFE) + ceramic sleeve, has good friction resistance. ⑩: Using new lightweight materials, lighter weight Technical parameter model unit GP10 (under development) GPF15GPF20 Pumping rate L/S (m3/h)10(36)15(54)20(72) Ultimate vacuum Pa1-201-201-20 Motor power kw 1.11.52.2 Motor speed rpm282528402840 Air inlet size KF254040 Exhaust port size KF252525 Air conditioning method Natural air cooling gear lubricant anti-wear hydraulic oil, synthetic gear oil noise dB707373 Weight (without motor) Kg274050