SU1425359A1 - Rotor machine - Google Patents

Abstract

The invention allows to reduce labor-consuming and more accurate accuracy of rotor fixation when setting the gap in screw compressors. In case 1 with lids 2, 3 suction and discharge nozzles 4, 5, there is a working cavity 6 in which the leading and driven rotors are installed with axial clearance P) 7, 8. P 7, 8 mounted on stepped shafts (B) 9 in their section 11 with a smaller diameter, installed on the side of the nozzle 5 on paired angular contact bearings (RP) 12, 13. RP 12, 13 are installed in case I with a radial clearance. Between RP 12 and cover 2 placed spring (P) 14, in contact with the outer ring RP 12. RP 13 outer ring in contact with the end surface of the housing 1. RP 12, 13 are installed on B 9 with the possibility of axial movement using a nut 15. On section 11 between the end of the larger section the diameter and the inner race of RP 13 are mounted with disc plates P 16 with a stiffness greater than the rigidity of P 14. The force P 16 set to B 9 must not be less than the force P 14 in order for the return stroke of the rotors 7, 8 not to decrease clearance. 2 Il.

Description

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The invention relates to compressor engineering and can be used in the manufacture of rotary and screw compressor masks: tires.

The purpose of the invention is to reduce the labor intensity and improve the accuracy of fixing the rotor when installing an axial gap between the rotor and the housing from the discharge nozzle side.

FIG. 1 shows a screw compressor, a longitudinal section; in fig. 2 - bearing unit.

The compressor consists of a housing 1 (Fig. 1) with lids 2 and 3, suction 4 and discharge 5 nozzles and a working cavity b, in which the leading 7 and the driven 8 rotors are installed with axial clearance a. The shafts 9 of the rotors 7 and 8 are mounted on radial bearings 10 and equipped with 5 smaller angular contact bearings 12 and 13 located on section 11 with a smaller diameter on the side of the discharge nozzle, which are installed in housing 1 with a radial clearance b, and between Radial thrust bearing 12 (Fig. 2) and lid 2 houses a spring 14 in contact with the outer race of the bearing 12, the bearing 13 of the outer race contacts the end surface of the housing 1, and the inner sleeves are attached to lakh 9 by a nut 15. On the section of the shaft 9 with a smaller diameter between the end of the section with a larger diameter and the inner race of the angular contact bearing 13 there are mounted cup springs 16 with rigidity greater than the rigidity of the spring 14.

The compressor works as follows.

Air enters through the nozzle 4, is captured by the rotating rotors 7 and 8, is compressed and supplied through the nozzle 5 to the consumer. The radial forces from the compressed air pressure on the rotors 7 and 8 are perceived by the radial bearings 10, and the axial, directed from the pressure to the suction, by the paired radial-resistant ball bearings 12 and 13. The radial clearance b between the outer rings of the bearings 12 and 13 and the housing 1 excludes the radial forces on the supports 12 and 13. The forces of the reverse axial stroke of the rotors 7 and 8 are perceived by the disc spring 14. The stiffness of the springs 14 is chosen

sufficient to overcome the rotors 7 and 8 backward, these efforts account for 10–20% of the main work force.

Thus, the outer rings of the bearings 12 and 13 are clamped in the housing 1 between the end face and the cup spring 14, and the inner rings are placed on the shafts 9 with the possibility of movement between the cup springs 16 and the nut 15. This installation of the bearings 12 and 13 allows the gap a between the ends of the rotors 7 and 8 and the housing 1 by turning the nut 15 to the required angle. The rotation of the nut 15 leads to compression of the springs .16 and movement of the rotor shaft 9 7, 8 relative to the angular contact bearings 12 and 13, i.e., to a change in the position of the rotors 7 and 8 relative to the housing 1, since the position of the bearings 12 and 13 in the housing 1 remains unchanged. The force of the springs 16 mounted on the shaft 9,

must be no less than that of the springs 14 so that the return stroke of the rotors 7 and 8 does not lead to a reduction in the gap.

Claims (1)

Invention Formula A rotary machine, mainly a screw compressor, comprising a housing with covers and a working cavity, suction and discharge nozzles and screw rotors placed in the working cavity, mounted on stepped shafts mounted on the pressure nozzle side on paired angular contact bearings placed on a lower shaft step bore housing with a radial clearance, and between the lid and the outer race of a single bearing mounted spring, and the inner bearing sleeves pursed nut, different This is due to the fact that, in order to reduce labor intensity and increase the accuracy of fixing the rotor when installing the axial gap between the rotor and a casing on the side of the discharge nozzle, it is equipped with at least one additional spring mounted between the larger shaft step and the inner race of bearings mounted on the rotor side, the additional spring being made with a greater stiffness than the spring located on the side of the cover, and radially -thrust bearings are mounted on the shaft with the possibility of axial movement with a nut. eleven FIG. 2