Interstage pressure regulating structure of two-stage screw air compressor

Abstract

The invention provides an interstage pressure regulating structure of a two-stage screw air compressor. The structure can change the inter-stage pressure (also referred to as the exhaust pressure of afirst-stage main machine) by adjusting the air suction quantity of a second-stage main machine, thereby improving the load of a first-stage main machine rotor, thereby eliminating the noise and vibration generated by the first-stage main machine under the unloading condition. The first-stage main machine, the second-stage main machine and an oil distributing barrel are arranged along the air flowdirection, the first-stage main machine rotor and the second-stage main machine rotor are connected through a connecting structure, a second-stage main machine compression cavity and a second-stage main machine air suction cavity are in communication through a bypass flow channel, a valve plate is pressed by a return connection port of the bypass flow channel and the second-stage main machine compression cavity, and the valve plate is mounted on a mobile structure.

Description

technical field [0001] The invention relates to the technical field of compressors, in particular to an interstage pressure regulating structure of a two-stage screw air compressor. Background technique [0002] According to different compression characteristics, screw air compressors usually have a single-stage or multi-stage compression structure, among which multi-stage compression is mainly two-stage compression. Since the two-stage compression process is closer to isothermal compression, theoretically, it is better than single-stage compression. Compression is more energy efficient and therefore more widely used. [0003] When the two-stage screw air compressor is running, it needs to adjust the loading or unloading according to the characteristics of the load. When the two-stage compressor is in the unloading condition, the force on the rotor and bearing of the first-stage main engine will change significantly, and it is under light load. state, it is easy to cause th...

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Problems solved by technology

[0004] Aiming at the shortcomings of the two-stage screw air compressor in the unloading condition, the rotor of the first-stage main engine is easy to lose stability, thereby causing noise and vibration, the present invention provides an interstage pressure adjustment structure of the two-stage screw air compressor, which The structure can adjust the suction volume of the second-stage main engine, change the interstage pressure (also called the exhaust pressure of the first-stage main engine), and increase the load of the rotor of the first-stage main engine, thereby eliminating the unloading condition of the first-stage main engine. Noise and vibration generated under

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