The structure of the suction part of the compressor

Abstract

The invention provides a compressor suction portion structure, which keeps the suction port of the compressor main body closed when the compressor is started, thereby reducing the start-up load of the prime mover. The suction part of the compressor is provided with a suction passage (30) communicating with the suction port (43) of the compressor main body (40), and the capacity control valve (10) is arranged on the suction passage (30) , and a valve body (12) is provided in the capacity control valve (10), and the valve body (12) has a check function that only allows gas to pass from the primary side to the secondary side when the valve is opened. In addition, a normally closed auxiliary switch valve (20) is provided on the suction channel (30) on the primary side or secondary side of the capacity control valve (10), and the pressure in the storage tank (60) is greater than When it is equal to the specified normal operation start pressure, the suction channel (30) is opened.

Description

technical field [0001] The present invention relates to a structure of a suction part of a compressor, and more specifically, to a structure of a suction part of a compressor having a capacity control device that controls the suction of a compressor main body driven by a prime mover such as an engine or an electric motor. Gas, the pressure of the compressed gas supplied to the consumption side is controlled to be close to the specified target pressure. Background technique [0002] A capacity control device is installed in the compressor that sucks gas into the compressor main body driven by the prime mover, compresses it, and supplies the compressed gas to the consumption side connected to an air working machine, etc. The secondary side pressure controls the suction volume of the compressor main body, and by controlling the suction volume of the compressor main body with the capacity control device, the secondary side pressure of the compressor main body is controlled (capa...

AI Technical Summary

Problems solved by technology

[0007] In the compressor constituted as above, if the compressor main body 140 is started with the suction port 143 opened, a large amount of gas is sucked into the compressor main body 140 and compressed, thereby generating a large load, and the drive for driving it The prime mover 150 is also subjected to a large load, causing a slow start-up problem of the prime mover 150, or causing a start-up failure such as stopping the prime mover 150, which is in an unstable operation state at a low rotational speed immediately after the start-up.

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