Novel two-stage screw air compressor

Abstract

A novel two-stage screw air compressor comprises a first main motor, a first-stage main compressor body, a second main motor and a second-stage main compressor body, wherein an exhaust port of the first-stage main compressor body is communicated with an air inlet of the second-stage main compressor body. The novel two-stage screw air compressor further comprises a first frequency converter and a second frequency converter, the first frequency converter is connected with the first main motor, and the second frequency converter is connected with the second main motor; the air compressor further comprises a controller used for controlling the first frequency converter and the second frequency converter, and a second pressure sensor is arranged on the second-stage main compressor body and is connected with the controller through signals. A fixed hard connection mode is not adopted between the two main compressor bodies, and therefore the installing position between the two main compressor bodies can be flexibly adjusted according to actual conditions. The two main motors are respectively controlled by the two frequency converter and can be flexibly controlled according to the exhaust pressure conditions of the second-stage main compressor body to achieve the optimal energy-saving effect.

Description

Technical field [0001] The invention relates to a two-stage screw air compressor. Background technique [0002] Air compressor is a kind of equipment with huge power consumption. Its power consumption accounts for about 7% of my country's total power generation. Its main forms are piston type, rotary type, sliding vane type, etc. Screw compressor is a kind of rotary compressor, which is widely used in various industrial fields in our country, and its proportion is increasing year by year. At present, the energy efficiency of screw compressors is relatively low, and only individual products of individual companies can achieve energy efficiency level I. Most products are mainly at level II energy efficiency, and some products are even at level III energy efficiency. At present, the application of this technology can achieve energy saving of 120,000 tce / a, CO 2 The emission reduction is about 320,000 t / a. The oil-injected screw air compressor adopts two-stage compression to improv...

AI Technical Summary

Problems solved by technology

However, the existing two-stage screw air compressors are connected by means of gear connection to drive the screws of the two-stage compressor main engine. In two respects: first, the fixed mechanical connection fixes the relative position of the two-stage compressor, and the two-stage compressor can only be installed at a fixed physical location, and the installation space cannot be flexibly arranged according to actual working conditions; The second is that the screws of the two-stage compression hosts are connected by this fixed connector, so that the two-stage compression hosts cannot be flexibly adjusted separately; the third is that the gear transmission will bring lateral force, which will be unfavorable to the life of the host bearings. Fourth, the gear drive will produce unfavorable factors such as transmission loss and transmission wear

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