Dry type oil-free screw compressor

Abstract

The invention relates to a dry type oil-free screw compressor. The dry type oil-free screw compressor comprises a shell, a main transmission shaft, a gear transmission assembly and a female and male screw transmission pair, wherein the main transmission shaft, the gear transmission assembly and the female and male screw transmission pair are installed in the shell; the shell comprises a gear box shell, a middle body and a compressor body shell which are sequentially connected in a sealed and fastened manner; the compressor body shell is provided with an axial air inlet port and a top exhaust port; the lower space of an inner cavity of the gear box shell, the lower space of an inner cavity of the middle body and the lower space of an inner cavity of the compressor body shell communicate to form a lubricating oil containing cavity; the axial air inlet port communicates with a compression cavity through an arc-shaped channel; part of the bottom face of the arc-shaped channel can make contact with lubricating oil in the lubricating oil containing cavity; and an exhaust side sealing assembly comprises an oil seal assembly, an air seal assembly and a ventilation pressing ring arranged between the oil seal assembly and the air seal assembly. The shell is divided into three parts, the structural design is reasonable and compact, the size is small, the occupied installation space is small, and the dry type oil-free screw compressor is more suitable for being mounted on a vehicle and is very suitable for being installed on chassis of most vehicles.

Description

technical field [0001] The invention relates to the technical field of compressors, in particular to a dry-type oil-free screw compressor. Background technique [0002] The dry oil-free screw compressor is a twin-screw compressor. There is no lubrication in the compression chamber, but lubricating oil is required in the gearbox. Therefore, a corresponding cavity is usually required in the compressor housing to store sufficient lubrication. Oil, the long-term operation of the compressor will cause the temperature of the lubricating oil to rise, which requires the installation of a corresponding oil cooling device, resulting in a large volume of the compressor and a large installation space, which is not suitable for vehicle use. For example, the authorization announcement number is CN203742985U The patent: oil-free dry screw air compressor, the compressor is designed with a corresponding cooler for cooling the oil, resulting in a large compressor volume, thereby increasing th...

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Problems solved by technology

[0002] The dry oil-free screw compressor is a twin-screw compressor. There is no lubrication in the compression chamber, but lubricating oil is required in the gear box. Therefore, a corresponding cavity is usually required to store a sufficient amount of lubricating oil in the compressor housing. Oil, long-term operation of the compressor will cause the temperature of the lubricating oil to rise, which requires the installation of a corresponding oil cooling device, resulting in a large compressor and a large installation space, which is not suitable for vehicle use. For example, the authorized announcement number is CN203742985U Our patent: Oil-free dry screw air compressor, the compressor is designed with a corresponding cooler for cooling the oil, resulting in a large compressor volume, which increases the installation space

In addition, the existing compressor housing has the disadvantage of not being compact enough in structure, and the sealing structure at the end of the screw has the disadvantage of poor sealing effect, and often a small amount of lubricating oil enters the compression cavity, thereby affecting the quality of the compressed gas. Therefore, it is necessary to improve and optimize the existing dry oil-free screw compressor

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