Fluid injected screw compressor element

Abstract

A fluid-injected screw-type compressor element comprising two co-operating rotors (2 and 3) which are radially and axially bearing-mounted in a housing (1), whereby this housing confines a rotor chamber (4) in which the rotors (2 and 3) are situated and in which a fluid circuit (11) for the injection of a fluid discharges, characterised in that the radial bearing of at least one rotor is formed by the contact of the rotor concerned with the part of the wall of the housing opposite the radial perimeter of the rotor concerned and / or the co-operation with the other rotor and by maximally one additional radial bearing.

Description

technical field [0001] The present invention relates to a fluid injected screw compressor element comprising two cooperating rotors, said rotors being support fitted in a housing such that the housing defines a rotor chamber in which said rotors are located , and a fluid circuit for the injection fluid leads into the chamber. Background technique [0002] Fluid-injected screw compressor elements are generally known and operate according to a known principle in which the volume of the compression chambers formed between the mutually meshing teeth of the respective rotor is gradually reduced while the rotor is rotating. [0003] One of the compression chambers formed between the rotors is connected to the outlet of the screw compressor element after the rotors undergo a certain rotation. [0004] Oil-injected screw compressor elements are currently known, which have a relatively high kinematic viscosity (according to ISO 46, 30-70 cSt at 40°C (=3×10 -6 -7×10 -6 m 2 / s)) oi...

AI Technical Summary

Problems solved by technology

[0008] A disadvantage of such known screw compressor elements is that such roller bearings are generally expensive and relatively difficult to assemble during the assembly of the screw compressor element

[0011] A disadvantage of such water-injected compressor elements is that such water-lubricated sliding bearings are generally expensive, since the above-mentioned bushings are always made of relatively expensive materials, which require high manufacturing tolerances for the bushings

[0012] Another disadvantage of such water-injected screw compressor elements is that their housings are often relatively complex due to the presence of several injection channels for water injection in the compression chambers and sliding bearings

[0013] Another disadvantage of the known water-injected screw compressor elements is that the clearances of the rotors in the housing are relatively large, whereby there are leakage losses in the compression chambers between the rotors and between the rotors and the walls of the rotor chambers , this leakage loss is absorbed to some extent by the jet fluid

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