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Liquid injected screw compressor, controller for the transition from an unloaded state to a loaded state of such a screw compressor and method applied therewith

A technology of screw compressors and compressors, which is applied to components of pumping devices for elastic fluids, rotary piston type/swing piston type pump components, machines/engines, etc., and can solve the problem of complex and impractical solutions. , short response time and other problems, to achieve the effect of eliminating risk of failure, simple control, and realization of control

Active Publication Date: 2016-05-25
ATLAS COPCO AIRPOWER NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Available solutions to this problem are inherently complex and therefore generally impractical, and have the negative effect that there is some tension in order to create the right stress in the consumer network during the transition from an unloaded to a loaded state. Reaction time, which users prefer to keep as short as possible

Method used

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  • Liquid injected screw compressor, controller for the transition from an unloaded state to a loaded state of such a screw compressor and method applied therewith
  • Liquid injected screw compressor, controller for the transition from an unloaded state to a loaded state of such a screw compressor and method applied therewith
  • Liquid injected screw compressor, controller for the transition from an unloaded state to a loaded state of such a screw compressor and method applied therewith

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Embodiment Construction

[0036] figure 1 The device shown in is a liquid-injected screw compressor 1 according to the invention comprising a known screw compressor element 2 having a housing 3 in which two meshing screw rotors 4 are driven by a motor or the like (not shown).

[0037] The compressor element 2 is provided with an inlet 5 which can be closed by a controllable inlet valve 6, the inlet 7 of which is connected via a suction pipe 8 to a suction filter 9 for sucking gas from the outside (in this case In this case, air is drawn in from the outside).

[0038] The compressor element 2 is also provided with an outlet 10 and a pressure pipe 11 connected to the outlet, which is connected to a downstream consumer network 15 for passage through a pressure vessel 12 with a liquid separator 13 and through cooling Device 14 supplies various air tools or the like (not shown herein).

[0039] A non-return valve 16 is provided on the outlet 10 of the compressor element 2 and a minimum pressure valve 17 ...

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Abstract

Liquid injected screw compressor with an inlet valve (6) and blow-off valve (19); a liquid circuit (20) with injector (22); a controller (35) for the transition from unloaded to loaded, whereby when unloaded the inlet valve (6) is closed and the blow-off valve (19) is open, and when loaded the inlet valve (6) is open and the blow-off valve (19) is closed, and whereby during an aforementioned transition, when the injection pressure (p22) is below a minimum threshold, the inlet valve (6) remains closed and is opened with a certain delay (tB-tA) and that there are means to gradually increase the injection during this delay (tB-tA) and to open the inlet valve (6) when the injection pressure (p22) has reached the minimum threshold.

Description

technical field [0001] The present invention relates to liquid-injected screw compressors, and more particularly to controls for such screw compressors for operating from an unloaded state (simply "empty", i.e., no compressed gas to be expelled) The control takes place during the transition to the loaded state ("loaded" in short, ie the screw compressor has to supply compressed gas, eg compressed air). [0002] More specifically, the present invention relates to a type of liquid-injected screw compressor comprising: a compressor element having an inlet and a controllable inlet valve capable of closing said inlet; an outlet and a A pressure pipe on said outlet, which is connected to the downstream consumer network and a controllable discharge valve for discharging the compressed gas to the environment; a liquid circuit with an ejector for inject liquid into the compression element; liquid separator, which is placed in the pressure tube to separate the liquid from the compresse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04C28/06F04C28/24F04C18/16
CPCF04C28/06F04C18/16F04C28/24F04C28/04F04C29/0014F04C29/026
Inventor P·德尚法莱尔
Owner ATLAS COPCO AIRPOWER NV
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