Unlock instant, AI-driven research and patent intelligence for your innovation.

Gas compressor

A gas compressor and compressor technology are applied in the field of gas compressors to achieve the effect of preventing the generation of condensed water

Active Publication Date: 2019-11-19
HITACHI IND EQUIP SYST CO LTD
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, generally speaking, for reasons such as maintenance, the rated specification of the motor is set lower than the limit speed, so strictly speaking, even if the motor is driven at the rated maximum speed, there is room for higher speed rotation.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Gas compressor
  • Gas compressor
  • Gas compressor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] figure 1 The configuration of air compressor 100 (hereinafter referred to as "compressor 100") according to Embodiment 1 of the present invention is schematically shown. In this example, air is used as the compressed gas, but it is not limited to this, and other gases may also be used. The compressor 100 is a liquid-feed type displacement compressor that supplies liquid (oil) to a compression working chamber, and an oil-feed type screw compressor is applied in this example. In addition, this invention is not limited to this, A turbo type (turbo type) compressor may be sufficient.

[0025] The compressor 100 includes an electric motor 1 as a driving source, an inverter 21 for changing the frequency of electric power supplied to the electric motor, a compressor main body 2 having a screw rotor, and separating compressed air discharged from the compressor main body 2 from lubricating oil. A gas-liquid separator 6, a heat exchanger 7 for cooling compressed air, a heat exc...

Embodiment 2

[0055]Example 2 to which the present invention is applied will be described. In Embodiment 1, the problem of preventing the generation of condensed water during no-load operation is solved by controlling the lower limit speed of the motor 1, but in this modified example, before changing the lower limit speed of the motor 1, the operation control of cooling mechanisms such as the fan device 9 is performed. is one of the characteristics.

[0056] The structure of the compressor 100 in the second embodiment is the same as that of the first embodiment, but the structure of the fan unit 9 is different. In Embodiment 1, the fan unit 9 is always driven at a rotation speed equal to or higher than the rated minimum rotation speed while the compressor 100 is being driven. This is because the fan unit 9 needs to generate an air flow in order to introduce cooling air for the motor 1 and the control system from the outside of the casing.

[0057] However, for example, when the installati...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The purpose of the present invention is to reliably prevent generation of drain without depending on a difference in ambient temperature at which a compressor is installed. The gas compressor is provided with: a compressor body compressing a gas; a driving source driving the compressor body; a control unit controlling the rotation speed of the driving source according to the discharge pressure ofthe compressor body; and a temperature detecting device detecting the temperature of the discharge gas of the compressor body, wherein, when the discharge pressure reaches the upper limit pressure higher than the set pressure, the gas compressor executes a no-load operation in which the rotation speed of the driving source is set as the lower limit rotation speed. When the temperature detected bythe temperature detecting unit is detected to be less than or equal to a predetermined temperature during the no-load operation, the control unit performs a control such that the lower limit rotationspeed of the driving source is set to be higher than the lower limit rotation speed when the detected temperature is higher than the predetermined temperature, and set to the lower limit rotation speed when the temperature of the discharge gas is higher than the predetermined temperature.

Description

technical field [0001] The present invention relates to a gas compressor, and relates to a gas compressor that performs variable speed control based on inverter control. Background technique [0002] It is known that in a gas compressor that performs variable speed control of the driving speed of a driving source (such as a motor, etc.) When the predetermined pressure requested by the user of the compressor is reached, so-called no-load operation (unload operation) control is performed to reduce the rotation speed of the driving source that drives the compressor main body to reduce the load. [0003] For example, Patent Document 1 discloses an example of no-load operation of a compressor, in which the main body of the compressor uses a motor controlled by a power conversion device, and the discharge pressure value of the main body of the compressor or the discharge pressure corresponding to the pressure value are used. The PID control corresponding to the temperature of the...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): F04C28/06F04B49/06F04C18/16F04C28/08F04C29/04
CPCF04B49/06F04C18/16F04C28/06F04C28/08F04C29/04F04B49/022F04B49/20F04B49/08F04B2205/11F04B35/04F04C2270/195F04C2240/81F04C28/28Y02B30/70F04B49/02
Inventor 大城龙亮
Owner HITACHI IND EQUIP SYST CO LTD