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Multistage Compressor

a compressor and multi-stage technology, applied in the direction of piston pump, rotary/oscillating piston combination for elastic fluid, pump control, etc., can solve the problems of increasing the number of parts, increasing the installation area or mounting area, increasing the material cost, and increasing the required space and maintenance costs. , to achieve the effect of efficient generation

Inactive Publication Date: 2017-09-21
HITACHI IND EQUIP SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention enables efficient generation of both high-pressure and low-pressure compressed gases.

Problems solved by technology

Thus, independent control of the rotational speed of each stage only for optimization of intermediate pressure increases the number of parts, and various problems such as the increase in material cost, required space, and also maintenance cost remain.
In this case, compressors for high pressure and low pressure may be provided separately, but there are problems of increase in installation area or mounting area and increase in cost.
Reduced pressure in this manner results in loss of the high-pressure compressed gas energy.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0021]FIG. 1 is a schematic view of a two-stage screw air compressor (hereinafter simply referred to as “compressor”) 20A, and a configuration of a compressor system (including a high-pressure / low-pressure air lines, a reservoir tank 8 and the like), and a gas flow according to Embodiment 1 to which the present invention is applied. Although an oilless screw air compressor is applied in this embodiment, the present invention is not limited thereto, and a liquid supply (oil, water, etc.) type compressor may be applied. Compression mechanism such as scroll, reciprocation, vane or the like may be applied, and multistage configurations from a combination of various types and the like may be applied. Various configurations are applicable within a scope not deviating from the spirit thereof.

[0022]The compressor 20A includes a low-pressure stage compressor main body 1, a driving source (for example, motor 3) configured to drive the low-pressure stage compressor main body 1, a high-pressure...

embodiment 2

[0043]A compressor 20B according to Embodiment 2 of the present invention will be described. The main difference from Embodiment 1 is that the high-pressure stage suction valve 14 of Embodiment 1 is not provided and a by-pass pipe 25 is connected between a pipe between the low-pressure stage discharge check valve 19 in the low-pressure air line 100 side piping system and the low-pressure line discharge valve 13, and a pipe from the discharge side of the high-pressure stage compressor main body 1, a discharge side by-pass valve 26 is provided midway of this by-pass pipe 25, and in addition, in the discharge side pipe of the high-pressure stage compressor main body 2, a pressure regulating check valve 27 is provided downstream of the branch point with the by-pass pipe 25.

[0044]Further, the compressor 20B of Embodiment 2 is capable of supplying the compressed air generated by the low-pressure stage compressor main body 1 alone to the low-pressure air line and can perform the normal ope...

embodiment 3

[0048]A compressor 20C according to Embodiment 3 of the present invention will be described. The main differences between Embodiment 3 and other embodiments is that when compressed air is supplied to the low-pressure air line alone, either one of the low-pressure stage compressor main body 1 or the high-pressure stage compressor main body 2 is selectively operated so that compressed air can be supplied.

[0049]When compressor air is supplied only to the low-pressure air line, in cases where the amount of air used is small, it is generally more efficient to operate the high-pressure stage compressor with a smaller volume at a higher speed than operating the low-pressure stage compressor at a low speed.

[0050]FIG. 4 shows a schematic configuration of the compressor 20C according to Embodiment 3. In the following description, the same reference numerals are used for the same members and elements, and a detailed description will be omitted.

[0051]The suction side piping system of the low-pr...

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Abstract

A multistage compressor including: at least a first compressor main body and a second compressor main body configured to suck compressed gas discharged from the first compressor main body to discharge the compressed gas with higher pressure; a first driving source configured to drive the first compressor main body; a second driving source configured to drive the second compressor main body; an intermediate pipe configured to connect a discharge side of the first compressor main body and a suction side of the second compressor main body; a low-pressure side discharge piping system branched from the intermediate pipe; an on-off valve disposed in the low-pressure side discharge piping system and configured to switch permission and prohibition of a flow of compressed gas discharged from the first compressor main body; and a control unit configured to control driving of the first driving source and the second driving source.

Description

INCORPORATION BY REFERENCE[0001]The present application claims priority from Japanese application JP-2016-051854 filed on Mar. 16, 2016, the content of which is hereby incorporated by reference into this application.TECHNICAL FIELD[0002]The present invention relates to a multistage compressor and relates to a multistage compressor including a plurality of compressor main bodies.BACKGROUND OF THE INVENTION[0003]A known gas compressor configured to suck gas (for example, air) to generate compressed gas (for example, compressed air) includes a multistage compressor that connects gas passages of a plurality of compressor bodies in series (hereinafter referred to as “multistage compressor”). In some multistage compressors, a gas discharge side of a low-pressure stage compressor main body and a gas suction side of a high-pressure stage compressor main body are connected through an inter cooler (intercooler), and gas is compressed in two-stages.[0004]In a so-called single stage compressor ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F04B49/00F04B49/24F04B49/08
CPCF04B49/007F04B2205/05F04B49/24F04B49/08F04C23/003F04B35/04F04B39/06F04B41/06F04B49/22
Inventor KASAHARA, MASAYUKI
Owner HITACHI IND EQUIP SYST CO LTD
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