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Oil-free compressor and method of operation thereof

A compressor and gas compression technology, applied to mechanical equipment, machines/engines, liquid fuel engines, etc., can solve problems such as time-consuming and abnormal operation, and achieve the effect of suppressing temperature rise

Active Publication Date: 2020-05-19
코벨코컴프레서가부시키가이샤
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the compressor, there is a problem that if the operation is temporarily stopped, it takes time until the operation is restarted to obtain the required discharge pressure.
For example, in the case of a two-stage oil-free screw compressor, due to the temperature rise, the male and female screw rotors of the first-stage compressor body may thermally expand and contact each other, resulting in malfunction.

Method used

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  • Oil-free compressor and method of operation thereof

Examples

Experimental program
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no. 1 Embodiment approach ）

[0030] like figure 1 As shown, the oil-free screw compressor 1 (hereinafter, may be simply referred to as the compressor 1 ) of this embodiment includes a suction valve 2 , a first-stage compressor body 4 , and a second-stage compressor body 6 . The compressor 1 of the present embodiment compresses air, which is an example of gas, in stages, and discharges it to a supply target not shown.

[0031] The first-stage compressor main body 4 sucks in air from the suction port 4 a through the piping 8 a interposing the suction valve 2 . The air sucked in from the suction port 4 a is compressed by a pair of male and female screw rotors (not shown) inside the first-stage compressor main body 4 . After compression, the first-stage compressor main body 4 discharges the compressed air from the discharge port 4b. The discharged compressed air is pressure-fed to the second-stage compressor main body 6 through the piping 8b interposed with the intercooler 10 and the trap 12 . The intercoo...

no. 2 Embodiment approach ）

[0053] Figure 4 The oil-free screw compressor 1 of the second embodiment is shown. In this embodiment, it is substantially the same as that of the first embodiment except for the position of the extraction point P1. Therefore, the same reference numerals are assigned to the same components as those of the first embodiment, and description thereof will be omitted.

[0054] In the present embodiment, the extraction point P1 is provided upstream of the intercooler 10 in the piping 8b. That is, the compressed air compressed by the first-stage compressor main body 4 and before being cooled by the intercooler 10 is sent back to the first-stage compressor main body 4 through the pipe 8e. Since the extraction point P1 is provided upstream of the intercooler 10, the air flowing through the pipe 8e is not cooled. Therefore, in this embodiment, the moisture in the air circulating through the pipes 8b, 8e does not condense, and the adverse effect of moisture does not occur in the firs...

no. 3 Embodiment approach ）

[0057] Figure 5An oil-free screw compressor 1 according to a third embodiment is shown. This embodiment is substantially the same as the second embodiment except that an intercooler 11 is further provided. Therefore, the same reference numerals are assigned to the same components as those in the second embodiment, and descriptions thereof are omitted.

[0058] In this embodiment, two intercoolers 10 and 11 are provided. One intercooler 10 is installed downstream of the extraction point P1 in the piping 8b. The other intercooler 11 is provided upstream of the partition valve 26 in the piping 8e. The intercooler 10 corresponds to the main flow cooling unit in the present invention. The intercooler 11 corresponds to the circulating flow cooling unit in the present invention.

[0059] According to the present embodiment, the temperature of the air in the piping 8e can be lowered by the intercooler 11, and an increase in the discharge temperature of the first-stage compressor...

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Abstract

An oil-free compressor 1 is provided with: an oil-less first-stage compressor body 4; an oil-less second-stage compressor body 6 connected downstream of the first-stage compressor body 4 with respect to the flow of air; a suction valve 2 connected upstream of the first-stage compressor body 4 with respect to the flow of air; a pipe 8e connecting a takeoff point P1 between the first-stage compressor body 4 and the second-stage compressor body 6 to a merging point P2 between the suction valve 2 and the first-stage compressor body 4, in such a way as to allow air to flow; and a gate valve 26 which is provided in such a way as to be capable of shutting off the flow of air through the pipe 8e, and which is opened in synchronism with the closing of the suction valve.

Description

technical field [0001] The present disclosure relates to oil-free compressors and methods of operation thereof. Background technique [0002] Oil-free compressors are often used as high-efficiency and environmentally friendly compressors. The oil-free compressor has a two-stage structure that compresses gas in two stages. For example, Patent Document 1 discloses such a two-stage oil-free compressor. [0003] Patent Document 1: Japanese Unexamined Patent Publication No. 2002-138977. [0004] In the compressor, there is a problem that if the operation is temporarily stopped, it takes time until the operation is restarted to obtain a required discharge pressure. In order to prevent the occurrence of this problem, the operation may be continued in a no-load state without taking in air, such as by throttling the intake valve. If it is operated under no load, the suction pressure and discharge pressure will drop. Especially in the 2-stage type oil-free compressor, the drop in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04C23/00F04C28/26F04C29/12
CPCF04C23/00F04C28/26F04C29/12
Inventor 壶井升中村元滨田克德
Owner 코벨코컴프레서가부시키가이샤