type
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Claw vacuum pump
(Multi-level roots analogy)
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Screw dry vacuum pump
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Ultimate vacuum
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Around 1-5Pa
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0.5-1Pa
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Process performance
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Moderate satisfaction
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Can be fully satisfied
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Vacuum pressure stability
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good
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very good
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Dust removal capacity
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weak
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Drainage capacity
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weak
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Supplies
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Gear oil
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Gear oil
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Corrosion resistance
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The rotor and vacuum chamber are ductile iron, which need to be coated
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The rotor and vacuum chamber are ductile iron, which need to be coated with strong corrosion resistance
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Maintenance
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high
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Low, 30% lower than the former.
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Maintenance
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Short-term maintenance, but long-term use in dust, liquid process is prone to failure, service life of about 8 years
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Almost maintenance-free, maintenance can be carried out once in about 2-3 years, and the design life is about 12 years.
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Price
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high
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High (similar to the former)
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Difference in reliability of use
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1. Due to the existence of a step spacer, the rotor and the pump shaft can not become one, the rotor is installed on the shaft later, in order to install and disassemble conveniently, the fit can not be too tight, so it is easy to have roller keys and loose rotor after operation.
2. There are many gaps, and each gap is standing, as long as there is a problem in any gap, the pump cannot work normally.
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1. The shaft and rotor of the screw vacuum pump are processed and formed after casting as a whole, which is fully integrated and there is no assembly problem.
2. The outer circular gap of the screw vacuum pump and the gap between the exhaust end and the rotor determine the working performance, and the gap between the rotor and the rotor is interrelated and reliable.
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Repair disassembly
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Difficult disassembly of claw pumps: Due to the multi-stage structure, all disassembly requires multi-stage decomposition, and rotor disassembly is the real difficulty, and every time it is disassembled, the accuracy will be reduced to varying degrees. Even simple cleaning is all disassembled and reassembled.
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Simple screw vacuum pump disassembly: The removal of the screw pump only requires removing the back cover bearing to extract the rotor from the front end, which is extremely simple. If it is only for cleaning and disassembly, after cleaning, simply put the rotor back into the pump body without any adjustments.
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Repair assembly
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Difficult assembly of claw pump: when the claw pump is installed, the 4-stage rotor should control the 8 gaps on the rotor end face, as well as the clearance between the rotor and the rotor of the 8 rotors, and any gap adjustment is not good to rework, want to install the rotor on the shaft, but also knock on the rotor, easy to damage the parts.
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Simple assembly of screw vacuum pump: When assembling the screw pump, you only need to control the gap between the screw exhaust end face and the exhaust wall, as well as the gap between the screw concave surface, and only need to adjust the simple two gaps
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