The history of screw compressor
Royal engineering college taught Sweden 1934 Lysholm(Li Siman) invent compressor of gas of type of the first double screw.
Begin from 60 time, aircrew of fuel injection double screw applies at refrigeration unit. Swedish SRM company (double screw) invent screw of bilateral asymmetry molded lines above all, make screw machine efficiency rises greatly.
1960 French Zimmern(Xin Maien) (odd screw) the new structure that invents odd screw. Trial-produce gave the first prototype 1962.
At the beginning of 70 time, holand GRASSO(case draws demand) make compressor of refrigeration of the first odd screw.
1972, japan begins to produce compressor of odd screw air.
1982, begin to produce compressor of odd screw refrigeration.
Principle of screw type compressor introduces
The rotor of of a pair of mutual clench the teeth gyroidal yin and yang inside cylinder of screw type compressor, two rotor have a tooth-like part of anything of a few sunken form, both each other rotates reversely. Mix between rotor the clearance between housing and rotor is 5 ～ only 10, advocate rotor (call this world rotor or protruding rotor again) , through by engine or electromotor drive (majority is electromotor drive) , another rotor (call shade rotor or sunken rotor again) be by advocate the oily film that rotor forms through fuel injection has drive, or by advocate rotor end and the synchronous gear drive that sunken rotor carries. Contact without the metal in drive so (theoretic) . Capacity of the length of rotor and diametical decision compressor (discharge) with exhaust pressure, rotor is longer, pressure is higher; Rotor diameter is bigger, flow is larger.
Course of helix rotor groove is full of gas when inspiratory mouth. When rotor rotates, rotor groove is closed by housing wall, form compress antrum room, after rotor groove closes, lube is entered to compress antrum room by gush, have sealed, refrigeration and lubricant effect. Rotate when rotor compress lubricant + gas (mixture of abbreviation oil gas) when, compress antrum room cubage to reduce, compress oil gas mixture to vent. When compressing antrum room to pass vent, oil gas mixture from compressor eduction, finish an inspiratory —— to reduce —— exhaust process.
Every rotor of screw machine by bearing of anti-friction bearing place, bearing is secured by the upright lid that stands by runner shaft to carry a department. The end that take energy of life by roller bearing bearing, exhaust is carried by the bearing of congratulate awl roller that leans with be opposite the bearing that is exhaust end normally is made rotor locates, stop namely push bearing, counteractive axial thrust, bear radial load, offer must axial runs the least space.
The job can be divided circularly for inspiratory, compress and exhaust 3 processes. Rotate as rotor, every finish identical working loop in succession to the tine of mutual clench the teeth.
The advantage of screw compressor
1. Reliability is high. Screw compressor component is little, not fragile, its movement is consequently reliable, life is long, heavy repair interval period can amount to 4-8 10 thousand H.
2. The operation is safeguarded convenient.
3. Motivation has been balanced. Suit to use as particularly movable type compressor, bulk small, weight is light, cover an area of an area little.
4. Adaptability is strong. Screw compressor has the characteristic that transports gas compulsively, cubage discharge suffers the effect of exhaust pressure scarcely, taller efficiency carries in broad limits internal energy, below the case that does not make any changes in compressor structure, apply to a variety of labour to pledge.
5. Much interblend is defeated. Stay actually between the rotor tooth flank of screw compressor have space, consequently ability liquid is pounded, can transport the gas that contain juice, contain dust gas, easy aggregate gas to wait.
The main drawback of screw compressor
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1. Cost is high. Because the rotor tooth flank of screw compressor is one airspace curved surface, need to use tailor-made cutting tool to undertake machining on the special device with high price. Additional, to the treatment of screw compressor air cylinder precision also has higher demand.
2. Cannot use at high-pressured circumstance. Because get the limitation of the respect such as rotor stiffness and bearing life, screw compressor can be used at medium, low-pressure limits only, exhaust pressure does not exceed 3MPa commonly.
3. Cannot use Yu Wei occasion. Clearance of screw compressor support is sealed gas, when commonly only cubage discharge is more than 0.2m3/min, screw compressor just has superior performance.
