SU1620681A1 - Method of compressing gas in screw compressor - Google Patents

Abstract

The invention relates to a compressor design and allows an increase in the productivity and efficiency of a screw compressor during gas compression. The cavity of the driven screw 6 is disconnected from the cylindrical part 2 of the suction port at the moment of the beginning of the formation of a shock wave arising in the cavity from abrupt deceleration of the suction gas against the discharge end, and from the end part 3 at the moment when the shock wave reaches the window suction, butt suction. Thus, the process of filling the cavity continues due to the fact that the pressure and density of the gas behind the shock wave front is higher than before it. The mass of the intake gas increases and, consequently, the compressor capacity increases, which, in turn, leads to an increase in productivity and efficiency of the compressor. 2 Il.

Description

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The invention relates to a compressor design and can be used in screw compressors.

The purpose of the invention is to increase productivity and efficiency by more fully using the velocity head of the intake gas.

FIG. 1 shows a screw compressor that implements a compression method, a longitudinal section; in fig. 2 shows section A-A in FIG. one.

The compressor contains a suction port 1, having cylindrical and face parts 2 and 3, made in housing 4. In the bores of housing 4, there are leading and driven screws 5 and 6, which form working dual cavities with housing 4. The housing 4 has ends 7 and 8 of suction and injection.

The method of compressing gas in a screw compressor consists in sucking gas through the suction port 1, moving the gas through the steam cavity of screws 5 and 6 as it moves from the suction end 7 to the discharge end 8, forming a shock wave when the pressure end 8 reaches the suction gas, disconnecting the cavity the driven screw 6 from the cylindrical part 2 of the suction port 1 at the moment of the beginning of the formation of a shock wave, detaching the cavity of the driven screw 6 from the end part 3 of the first suction window I at the time of reaching - the shock wave of the suction end 7, detaching the cavity of the lead screw 5 from the suction port 1, compressing and injecting gas.

These successive detachments of the cavity of the driven screw 6 from the cylindrical and front parts 2 and 3 of the suction port I are realized by the fact that the suction angles determined by the edges of the suction window 1 parts are described by the following mathematical dependencies:

for cylindrical part 2

C N3

O 0

oo

. ,

H

where T, J is the twist angle of the driven screw 6; 8V - the angle between the axis of the depression of the driven screw 6 and the beam drawn from the center of the driven screw 6 to the beginning of the pen of the tooth of the driven screw 6; a „is the angle of rotation of the driven screw 6, which corresponds to the angle of rotation of the leading screw 5 until the depression of the driven screw 6 is completely released from the tooth of the leading screw 5; for the front part 3

AGR AL + Yes

™ -% Ј

where the channel length of the driven screw 6;

pg - the number of revolutions of the driven screw 6;

a - local speed of sound;

Sal average gas velocity in the cavity of the driven screw 6.

For the lead screw 5, the transfer process is practically absent, since after the end of the suction process, the beginning of the compression process immediately follows, which makes it impractical to divide the lead screw 5 from the cylindrical and front parts 2 and 3 of the suction port 1 in time.

The use of a shock wave, the pressure and density of the gas behind the front which is higher than in front of it, allows the cavity filling process to continue.

Thus, the mass of the gas entering the cavity while holding the shock wave

1

five

0

five

0

within the suction cavity of the driven screw 6 is increased. In this case, the detachment of the cavity along the length from the suction port 1 prevents the shock wave from dissipating into the cylindrical part 2 of the suction port 1. When the shock wave reaches the suction end 7, the cavity of the driven screw 6 is disconnected from the end part 3 of the suction port 1, which prevents the wave through the end of the depression to dissipate into the suction chamber. Increased productivity at constant energy costs for gas compression leads to an increase in effective efficiency.

Claims (1)

Invention Formula Gas compression method in a screw compressor, including gas suction through a suction window, having a cylindrical and frontal part, the movement of the intake gas through the steam cavity formed by the screws and the compressor housing up to the discharge end with the formation of a shock wave when the latter is reached and the cavity of the leading and driven screws from the suction window, characterized in that, in order to increase productivity and efficiency by more fully utilizing the velocity head of the intake gas, the cavity of the driven screw is They are driven from the cylindrical part of the suction window at the moment the shock wave begins to form, and from the end part when the shock wave reaches the suction end. D HA-A five four 9U2.2