Oil free screw compressor

A compressor and oil screw technology, applied in the field of oil-free screw compressors, can solve the problems of high energy efficiency and high electricity costs, and achieve the effect of suppressing the increase in power consumption and preventing over-compression

Active Publication Date: 2010-12-01
HITACHI IND EQUIP SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it can be said that the electricity rate of the air compressor is as high as about 25% of the electricity rate in the factory equipment, so that a compressor with less power consumption and high energy efficiency is required

Method used

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Embodiment Construction

[0034] Hereinafter, an embodiment of the oil-free screw compressor of the present invention will be described with reference to the drawings. First, refer to Figure 5 An overview of oil-free screw compressors will be described. Figure 5 (a) is a top sectional view of the oil-free screw compressor 50, Figure 5 (b) is a front sectional view. The oil-free screw compressor 50 has a pair of male screw rotor 1 and female screw rotor 2 , and the pair of rotors 1 , 2 are accommodated in a chamber formed in the casing 3 . The chamber is formed by connecting two cylindrical spaces in a direction at right angles to the axial direction, and their axes are parallel to each other.

[0035] One shaft end of each rotor 1 , 2 is rotatably supported by bearings 11 , 12 , and the other shaft end is rotatably supported by bearings 13 , 14 . Bearings 11 to 14 are held on housing 3 . Lubricating oil is supplied to the bearings 11-14. Since the screw compressor 50 of the present invention i...

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Abstract

The present invention provides an oil free screw compressor, which can prevent the problems that such as excessive compression etc. which might be caused by closing of the discharge port before a volume of the compression chamber becomes zero and suppress an increase in power consumption. The oil free screw compressor comprises: a pair of male and female screw rotors (1,2) in which two or more twisted teeth are formed; a casing (3) which receives both the rotors (1,2) and in which a suction port and a discharge port are formed; and bearings (11-14) which rotatably support shaft end parts of both the rotors (1,2) and are held in the casing (3). There is provided a slot (6), next to the discharge port of the casing (3), which comes into communication with the discharge port with timing where a volume of a compression chamber formed by both the rotors (1,2) and the casing (3) becomes substantially zero as both the rotors (1,2) rotate, to prevent problems such as excessive compression.

Description

technical field [0001] The present invention relates to an oil-free screw compressor which prevents oil from being mixed into a compression working space formed by a pair of male screw rotors and female screw rotors. Background technique [0002] Among the screw compressors that combine a pair of screw rotors and form a compression working space, there are oil-supplied screw compressors and oil-free screw compressors. The above-mentioned oil-supplied screw compressors are used to cool the compressor and to drive a pair of The rotor supplies lubricating oil to the compression working space; the oil-free screw compressor drives a pair of rotors via timing gears to avoid contact between the rotors and prevent oil from entering the compression working space. [0003] Oil-free screw compressors are in high demand in industrial fields such as electronics, food, and chemistry where there is a fear of oil contamination. However, it can be said that the electricity rate of the air c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04C18/16F04C29/12
CPCF04C18/086F04C29/068F04C29/12F04C29/0035F04C18/16F04C18/088F04C29/065F04C2250/102
Inventor 斋藤隆史鹤诚司内田利一
Owner HITACHI IND EQUIP SYST CO LTD
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