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Method and apparatus in connection with a screw compressor

A screw compressor, pressure technology, applied to the components of pumping devices for elastic fluids, mechanical equipment, machines/engines, etc., can solve the problem of taking a long time

Active Publication Date: 2017-01-25
ABB (SCHWEIZ) AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this operation takes a long time

Method used

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  • Method and apparatus in connection with a screw compressor
  • Method and apparatus in connection with a screw compressor
  • Method and apparatus in connection with a screw compressor

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Embodiment Construction

[0015] In the present invention, a screw compressor driver including a screw compressor and a frequency converter is driven by a frequency converter. Frequency converters are known to drive electric motors at variable rotational speeds. In systems associated with the present invention, the output of the frequency converter is connected to an electric motor that rotates a screw compressor to produce pressurized gas.

[0016] Frequency converters typically include a processor with computing capabilities and internal measurements. The measurements relate to eg rotational speed, torque and power. These measurements can be used in the device's processor for further calculations.

[0017] In the present invention, the pressure vessel of a screw compressor driven by a frequency converter is filled or pressurized. According to an embodiment of the present invention, pressurization is performed using a specific velocity profile that changes velocity in a timed manner. In this speed...

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Abstract

A method of determining operation characteristics of a screw compressor drive and a screw compressor drive, the method comprising pressurising a pressure vessel of the screw compressor with a variable rotational speed of the screw compressor, the rotational speed of the screw compressor having a speed profile in which the rotational speed is changed stepwise such that between stepwise changes the rotational speed of the screw compressor is kept substantially constant for a time period, repeating the speed profile until the pressure of the pressure vessel reaches a set pressure value, determining pressure of the pressure vessel, power consumption of the screw compressor drive and mass flow rate during the pressurising when the rotational speed of the screw compressor is kept substantially constant, calculating energy efficiency of the screw compressor drive as a function of pressure of the pressure vessel and rotational speed of the screw compressor on the on the basis of the determined pressure of the pressure vessel and power consumption of the screw compressor drive.

Description

technical field [0001] The invention relates to screw compressors, in particular screw compressors driven by frequency converters Background technique [0002] Screw compressors are a widely used type of compressor for generating pressurized gas for a variety of purposes. For example, one of the uses of a screw compressor is in a pressurized air system to generate pressurized air to a container or similar pressure tank from which it is used through hoses or pipes. In such systems, a screw compressor is operated to provide the required pressure to the vessel and to keep the vessel pressurized during the use of pressurized gas. [0003] The screw compressor is rotated by an electric motor to generate pressure. Furthermore, frequency converters are often employed to drive the motor in a controlled and efficient manner. In order to efficiently control a system through a frequency converter, the system should be identified for its different operating points and its characteris...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04C28/08F04C28/28
CPCF04C28/08F04C28/28F04C2270/18F04C2270/20F04C2270/02F04C18/16F04C2270/051F04C2270/48F04C29/0085F04C2270/80G01R21/133
Inventor 安蒂·科索宁耶罗·阿霍拉
Owner ABB (SCHWEIZ) AG
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