SU1687884A1 - Screw compressor - Google Patents

Abstract

The invention relates to a compressor design and can be used in screw compressors with adjustable capacity and geometric compression ratio. The purpose of the invention is to increase efficiency. The possibility of independent adjustment of the geometric degree of compression and performance, starting from the suction end, allows you to eliminate energy losses during regulation due to the mismatch of the pressure of internal compression and the pressure in the discharge pipe, as well as losses associated with compression of the gas. Reducing losses allows for greater control efficiency and a lower cost for the compressor. 6 yl

Description

The invention relates to compressor engineering and can be used in win- ing. adjustable capacity compressors with a geometric compression ratio.

The purpose of the invention is to improve efficiency by providing separate or simultaneous adjustment of the geometric degree of compression and performance over the entire range of variation of the degree of compression.

1 shows a screw compressor, a longitudinal section; figure 2 is the same, the section aa in figure 1; Figures 3 to 6 show the arrangement of the controller and the piston in various control options.

The screw compressor includes a housing 1 with a pumping window, having cylindrical and end parts 2 and 3, located in housing 1 with the formation of working cavities 4, interacting screw

rotors 5 and spool regulator 6. In controller 6, there is an internal cavity 7 and holes 8, which communicate cavity 7 with working cavities 4. In cavity 7 of regulator 6, piston 9 is axially displaced with longitudinal bypass channels 10. Butt end 11 The inner cavity 7 at the position of the regulator 6, corresponding to the minimum degree of compression, is located in the plane of the ends 12 of the rotors 5 on the suction side. The holes 8 of the regulator b are made in the form of longitudinal cuts covered by the piston 9. In the proposed design, the longitudinal cuts are made to a depth of 7 and are formed by the cavity itself when it crosses the bores under the rotors 5, while the lateral surface of the piston 9 is limited to the internal cavity 7 of the regulator 6 and outer rotor cylinders 5.

Screw compressor works as follows.

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When the rotors 5 rotate, the gas enters the working cavities 4, is compressed and injected through the cylindrical and front parts 2 and 3 and the injection pipe to the consumer (Fig. 3). Adjusting the geometric degree of compression at full capacity (figure 5) is carried out by moving the spool regulator 6 in the axial direction along the rotors 5 with the closed position of the regulator 6 and the piston 9. The piston 9 abuts against the end 11 of the internal cavity 7 of the regulator 6. At the same time the position of the edges of the cylindrical part 2 of the injection window changes and, consequently, the geometric compression ratio of the compressor. When adjusting performance at low geometrical degrees of compression, the piston 9 is stationary, and the regulator b moves to the left and the gas from the working cavity 4 flows to the suction through the holes 8, the gap between the regulator 6 and the piston 9 and the channels 10 in the piston 9 (Fig. 4) ). When adjusting the capacity with large geometrical degrees of compression, the piston 9 moves to the left together with the regulator 6. Gas from the working cavity 4 flows to the suction through the holes 8 and the cavity 7 behind the piston (Fig.6).

The possibility of independent adjustment of the geometric degree of compression and performance, with sequential adjustment of performance

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Claims (1)

sti. starting from the suction end, it allows to eliminate the energy losses during regulation due to the mismatch of the pressure of the internal compression and the pressure in the discharge nozzle, as well as the losses associated with the compression of the gas. Reducing losses allows for greater control efficiency and a lower cost for the compressor. Claims An inventive screw compressor comprising a housing with a discharge window having cylindrical and face parts arranged in the housing with formation of working cavities, screw rotors and a spool regulator with an internal cavity and openings connecting the internal cavity of the regulator with working cavities characterized by that, in order to improve efficiency by providing separate or simultaneous adjustment of the geometric degree of compression and performance over the entire range of the degree of compression, The puller is provided with a piston with longitudinal bypass channels located in the internal cavity with the possibility of axial movement, while the end of the internal cavity at the position of the regulator corresponding to the minimum compression ratio is located in the plane of the ends of the rotors on the suction side, and the holes of the regulator are in the form of longitudinal cuts covered by a piston. L BUT R  / KXxNX V V 4  / I x 6 th 9 1 FIG. 2 FIG. four d 9 8 6 eight