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

Two-stage screw compressor and its operating method

A technology of screw compressors and compressors, which is applied in the direction of mechanical equipment, machines/engines, rotary piston pumps, etc., can solve the problems of minimizing the total power consumption without considering the minimization of power consumption, and achieve the effect of minimizing power consumption

Active Publication Date: 2020-03-27
코벨코컴프레서가부시키가이샤
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The two-stage screw compressor of Patent Document 1 considers controlling the intermediate pressure, but does not consider minimizing the total power consumption of the first-stage and second-stage compression

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
  • Two-stage screw compressor and its operating method
  • Two-stage screw compressor and its operating method
  • Two-stage screw compressor and its operating method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0036] like figure 1 As shown, the two-stage screw compressor 2 of this embodiment includes a first-stage compressor main body 4 , a second-stage compressor main body 6 , and a control device 8 .

[0037] The first-stage compressor main body 4 is a screw type, and passes through the first air pipe 10a to suck in air from the suction port 4a. A first motor (first electric motor) 12 is mechanically connected to the first-stage compressor main body 4, and the first motor 12 is driven to compress air by means of an internal screw (not shown). The first inverter 14 is electrically connected to the first motor 12, and the rotation speed of the first motor 12 can be changed. In addition, the power consumption of the first motor 12 is output to the control device 8 . The first-stage compressor main body 4 discharges the compressed air from the discharge port 4b after compression. The discharged compressed air is supplied to the second-stage compressor main body 6 through the second...

no. 2 Embodiment approach

[0056] The structure of the two-stage screw compressor 2 of the present embodiment and figure 1 The structure of the first embodiment shown is the same. also, Figure 6 Indicates the same as that of the first embodiment figure 2 It is a block diagram of the corresponding control device 8 of the two-stage screw compressor 2 of the second embodiment. This embodiment is substantially the same as the first embodiment except that the search unit 27 related to the first embodiment is replaced by a storage unit (second-stage rotational speed determination unit) 29 . Therefore, the description of the same parts as those of the first embodiment may be omitted.

[0057] like Figure 6 As shown, the control device 8 of the two-stage screw compressor 2 of the present embodiment includes a storage unit 29 that stores in advance an optimum second-stage rotational speed that minimizes total power consumption relative to the first-stage rotational speed. When the control device 8 change...

no. 3 Embodiment approach

[0061] The structure of the two-stage screw compressor 2 of the present embodiment and figure 1 The structure of the first embodiment shown is the same. also, Figure 9 Indicates that there is the same as the first embodiment figure 2 It is a block diagram of the control device 8 of the two-stage screw compressor 2 corresponding to the third embodiment. Figure 10 and Figure 11 Indicates the same as that of the first embodiment image 3 and Figure 4Corresponding to the control flow of the control device 8 of the two-stage screw compressor 2 of the third embodiment. The two-stage screw compressor 2 of the present embodiment is substantially the same as the first embodiment except that the controls related to the first-stage rotational speed and the second-stage rotational speed of the first embodiment are replaced. Therefore, description of the same parts as those of the first embodiment may be omitted.

[0062] like Figure 9 As shown, the control device 8 of the tw...

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

A two-stage screw compressor 2 is provided with a first-stage compressor body 4, a second-stage compressor body 6, and a control device 8. The first-stage compressor body 4 is driven by a first motor 12, the rotation speed of which is capable of being varied by a first inverter 14. The second-stage compressor body 6 is driven by a second motor 18, the rotation speed of which is capable of being varied by a second inverter 20, and is connected serially to the downstream side of the first-stage compressor body 4. The control device 8 has: a first-stage rotation speed determination section 25 that determines a first-stage rotation speed according to the required pressure; a first inverter control section 26 that controls the first inverter 14 so as to attain the first-stage rotation speed determined by the first-stage rotation speed determination section 25; a searching section 27 that determines, from among second-stage rotation speeds, an optimum second-stage rotation speed that minimizes the total power consumption of the first motor 12 and the second motor 18; and a second inverter control section 28 that controls the second inverter 20 so as to attain the optimum second-stage rotation speed. With this configuration, the two-stage screw compressor 2 is able to attain the required pressure and minimize the total power consumption.

Description

technical field [0001] The invention relates to a two-stage screw compressor and its operating method. Background technique [0002] There is known a two-stage type compressor capable of high-pressure compression by performing compression in two stages when compressing a working fluid. Among the two-stage compressors, the screw type is used in a wide range of applications because the rotational speed can be changed. [0003] In Patent Document 1, a two-stage screw compressor is disclosed. The above-mentioned two-stage screw compressor changes the pressure between the first stage and the second stage by changing the rotation speed of the first stage and the second stage. The intermediate pressure is adjusted to the allowable pressure range. [0004] Patent Document 1: Japanese Patent Application Laid-Open No. 7-158576. [0005] The two-stage screw compressor of Patent Document 1 considers the control of the intermediate pressure, but does not consider minimizing the total ...

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 Patents(China)
IPC IPC(8): F04C28/08F04C18/16F04C23/02H02P5/50
CPCF04C18/16F04C23/02F04C28/08H02P5/50
Inventor 壶井升中村元滨田克德
Owner 코벨코컴프레서가부시키가이샤
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com