Water-lubrication oil-free medium pressure two-stage-compression single-screw-rod air compressor

Abstract

The invention relates to a water-lubrication oil-free medium pressure two-stage-compression single-screw-rod air compressor. The air compressor comprises an electric motor, a first-stage single-screw-rod compression main machine, a second-stage single-screw-rod compression main machine, an air filter, a first-stage water and gas separator, a second-stage water and gas separator, a first-stage gas cooler, a second-stage gas cooler and an electrical control box; the first-stage single-screw-rod compression main machine and the second-stage single-screw-rod compression main machine are in transmission connection with the electric motor, and the air filter is connected with a gas inlet of the first-stage single-screw-rod compression main body; and the first-stage gas cooler is connected with the first-stage water and gas separator, the second-stage gas cooler is connected with the second-stage water and gas separator, and the electrical control box is electrically connected with the electric motor. Compared with the prior art, the water-lubrication oil-free medium pressure two-stage-compression single-screw-rod air compressor has the beneficial effects that the whole structure is simple and compact, complex pipelines and valves do not need to be additionally arranged, water lubrication is adopted, resistance losses are small, running reliability is good, volume efficiency is high, oil is avoided, zero emissions are achieved, no environmental pollution exists, running is carried out at the normal temperature, and the air compressor is environment-friendly, energy-saving and low in maintaining cost and has the very good application prospect.

Description

technical field [0001] The invention belongs to the technical field of machinery, and relates to an air compressor, in particular to a water-lubricated, oil-free, medium-pressure, two-stage compression single-screw air compressor. Background technique [0002] Nowadays, in order to meet the needs of medium-pressure (3-5MPa) gas sources in bottle blowing, medical industries, and military industries, reciprocating compressors or serial units of screw and piston compressors are used. Among them, reciprocating compressors mainly include symmetrical balanced medium-pressure compressors, four-stage compression, and their discharge pressure reaches (3-5MPa) and V-type medium-pressure compressors, four-stage compression, and their discharge pressure reaches (3-5MPa) ). However, there are buffers, coolers, and separators (oil, gas, and water separation) between the stages of the above two types of models, that is, there are three stages after stage I-II, stage II-III, stage III-IV a...

AI Technical Summary

Problems solved by technology

But above-mentioned structure still has following problem: 1) above-mentioned structure cylinder all is anhydrous lubrication, but all have oil lubrication in crankcase body and crosshead slideway, so there will be oil on piston rod, and when machine is doing reciprocating motion, oil will Crawling from the piston rod into the cylinder, in order to control the quality (oil) of the air source, multiple (one or more) oil filters must be installed at the compressor exhaust port; 2) The structure is heavy, the pipelines are intricate, and each There are many types of valves, and the control system is complicated (many control points); 3) The whole machine has many wearing parts, low operating rate, high noise, high vibration intensity, high power consumption under the same displacement, difficult maintenance of equipment, and long cycle. large area

However, the above-mentioned patent discloses an oil-lubricated single-screw compressor with an oil content of 5 ppm in the air supply, which cannot meet the application requirements in the fields of medical treatment, medicine, and food. To control the oil content of the air source, a completely oil-free air compressor must be used. Water lubricated single screw compressor can meet the requirements

Generally speaking, the medical equipment and pharmaceutical industries require that the oil content of the compressed air supply should not exceed 0.03ppm. In addition, an AA-grade ultra-high-efficiency oil removal filter must be installed to achieve a minimum residual oil content of 0.001ppm to ensure that medical instruments are not polluted. , while avoiding the impact on the patient's health; while the oil-lubricated air compressor cannot guarantee that the air supply does not contain oil, its oil content reaches 5ppm, and it will reach 10ppm after 3 to 4 months of use, which will seriously affect the patient's health. even cause medical malpractice

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