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Screw compressor

A technology of screw compressors and pipelines, which is applied in the direction of mechanical equipment, machines/engines, liquid fuel engines, etc., and can solve the problems of reduced working efficiency, reduced bearing reliability, and reduced bearing lubrication performance of screw compressors, etc.

Active Publication Date: 2014-11-05
HITACHI IND EQUIP SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] If the amount of oil supplied to the bearing chamber is too much, the power loss of the bearing will increase, and the working efficiency of the screw compressor will decrease.
On the other hand, if the amount of oil supplied to the bearing chamber is too small, the lubricating performance of the bearing decreases and the reliability of the bearing decreases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] figure 1 It is a sectional view showing the structure of the compressor main body of the screw compressor of Example 1. figure 2 It is a figure which shows the oil supply passage of the lubricating oil of the screw compressor of Example 1.

[0043] The compressor main body 10 of Embodiment 1 is installed in figure 2 The shown screw compressor 1 is a compressor that compresses air by a pair of male and female screw rotors (male rotor 11 and female rotor (not shown)) rotating in mesh with each other.

[0044] The male rotor 11 is accommodated together with a female rotor (not shown) in a working chamber 13 formed as a hollow portion of the casing 12, and the rotation shafts of the respective rotors ( figure 1 In the figure, it is shown that the rotating shaft 11a) of the male rotor 11 penetrates the working chamber 13 and is arranged. The working chamber 13 has bearing chambers 15a, 15b formed at both ends in the axial direction of the rotating shaft 11a, and bearing...

Embodiment 2

[0108] Image 6 It is a figure which shows the oil supply passage of the lubricating oil of the screw compressor of Example 2. Figure 7 It is a figure which shows the structure of the autonomous type three-way valve and autonomous type on-off valve equipped in the screw compressor of Example 2.

[0109] The structure of the screw compressor 1a of embodiment 2 is the same as that of the screw compressor 1 of embodiment 1 (refer to figure 2 ) structure is roughly the same, for figure 2 Components that are the same as those of the illustrated screw compressor 1 are denoted by the same symbols, and detailed description thereof will be omitted.

[0110] The screw compressor 1a of Embodiment 2 is equipped with an autonomous on-off valve (autonomous on-off valve) 50 between the branch point P1 and the branch point P4 of the oil supply pipe 20d in the bearing chamber to replace the flow regulating unit 22 (refer to figure 2 ). The autonomous on-off valve 50 has two connection ...

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PUM

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Abstract

The present invention addresses the problem of providing a screw compressor capable of supplying lubrication fluid in an amount suitable to both an operating chamber for compressing gas and a bearing chamber to which a bearing is attached. A screw compressor (1) is provided with: a compressor main body (10) in which are formed an operating chamber in which a pair of male and female rotors rotate and a bearing chamber provided with a bearing for supporting the rotors; an operating chamber oil-supply pipe (20c) for supplying lubrication oil to the operating chamber; a bearing chamber oil-supply pipe (20d) for supplying lubrication oil to the bearing chamber; an oil cooler (3) for cooling the lubrication oil discharged from the operating chamber; a bypass pipeline for bypassing the oil cooler (3); and a three-way valve (21) for opening and closing the bypass pipeline. The operating-chamber oil supply pipe (20c) supplies the lubrication oil cooled by the oil cooler (3) to the operating chamber, the bearing chamber oil supply pipe (20d) branches from the operating-chamber oil supply pipe (20c) to supply lubrication oil cooled by the oil cooler (3) to the bearing chamber, and a flow-adjustment means (22) is provided to the bearing chamber oil supply pipe (20d) to regulate the flow of lubrication oil.

Description

technical field [0001] The present invention relates to screw compressors. Background technique [0002] The screw compressor supplies a lubricating liquid such as lubricating oil to a bearing chamber in which a bearing supporting a screw rotor is assembled and a working chamber for compressing gas. Among them, the liquid supply amount (oil supply amount) to the bearing chamber has a great influence on the reliability of the bearing and the working efficiency of the screw compressor. [0003] If the amount of oil supplied to the bearing chamber is too much, the power loss of the bearing will increase, and the working efficiency of the screw compressor will decrease. On the other hand, if the amount of oil supplied to the bearing chamber is too small, the lubricating performance of the bearing decreases and the reliability of the bearing decreases. Therefore, in order to improve the reliability of the bearing and reduce power loss, it is necessary to control the amount of o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04C18/16F04C29/02
CPCF04C18/16F04C29/021
Inventor 千叶纮太郎纸屋裕治
Owner HITACHI IND EQUIP SYST CO LTD