Three-stage screw drive structure and screw compressor thereof

Abstract

The invention relates to a three-stage screw drive structure and a screw compressor thereof. The three-stage screw drive structure comprises three stages of rotor sets, wherein the rotor sets comprisemale rotors and female rotors which cooperate with each other; the male rotors or the female rotors are provided with gears which are coaxial; the three stages of rotor set comprise a first-stage rotor set, a second-stage rotor set and a third-stage rotor set; the second-stage rotor set and the third-stage rotor set are adjacent to each other; the first-stage rotor set is positioned on one sidesof the second-stage rotor set and the third-stage rotor set which are adjacent to each other; the second-stage rotor set and the third-stage rotor set are in drive through mutual engagement of the gears; the first-stage rotor set is rotatably connected with the second-stage rotor set through the rotors and a driving end of a driving device; and the three-stage screw drive structure is mounted in the screw compressor. The three-stage screw drive structure has the advantages that the service life of a main engine is long in a high-pressure environment with the exhaust pressure being 2.5-4.0 mpa,the energy efficiency of the main engine and structural compactness are high, and noises and vibration are reduced.

Description

technical field [0001] The invention belongs to the technical field of compression equipment, and in particular relates to a three-stage screw drive structure and a screw compressor thereof. Background technique [0002] With the improvement of the operating pressure of screw compressors and the improvement of energy saving requirements, the application of three-stage screw compressors will become more and more extensive. [0003] The exhaust pressure of the existing two-stage screw compressor is generally 0.5-3.5mpa; [0004] Under the same power, the two-stage screw compressor has 8% to 15% more air than the single-stage screw compressor; or, under the same air volume, the two-stage compression can save 8% to 15% on average compared with the single-stage compression. power; [0005] It can be seen from this that the two-stage screw compressor is not only more energy-efficient than the single-stage screw compressor, but also more reliable in operation because of the small...

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Problems solved by technology

[0006] However, when the two-stage screw compressor is under the medium and high pressure working condition of the discharge pressure of 2.5-4.0Mpa, the suction-exhaust pressure ratio and the pressure difference of the secondary main engine at this time are huge; generally the pressure difference is about 1.5-3.0Mpa. The gas axial force and radial force generated by the screw rotor are huge, resulting in a significant decrease in the operating life of the bearing, generally 5000h to 10000h; in addition, the large pressure difference often makes the secondary rotor rigidity insufficient, resulting in serious wear and deformation of the rotor under long-term operation. kill host kill

[0007] At present, the extension shaft of the exhaust end of the second-stage part of the two-stage screw main engine that appears on the three-stage screw compressor is connected with the third-stage main engine through the center bracket and the coupling, so that the matching length of the three-stage rotor group is longer, making the compressor The overall structure of the compressor is too long. While the volume of the compressor is larger, the overall operating noise and vibration of the compressor are increased, and the number of parts and sealing surfaces of the host is increased, resulting in increased leakage points and increased instability.

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