Oil-gas cooler and oil-gas cooler system of variable-frequency oil injection screw air compressor

Abstract

The invention provides an oil-gas cooler system of a variable-frequency oil injection screw air compressor. The oil-gas cooler system comprises an oil cooler, an air cooler, a fan, a fan cover and a temperature control valve. A first oil cooling channel, a second oil cooling channel and a communication area are arranged in the oil cooler. Screw oil separated from an oil-gas barrel can enter the first oil cooling channel for primary cooling; and the temperature control valve selects the screw oil to flow back to a screw machine body or to flow back to the screw machine body after being subjected to secondary cooling through the second oil cooling channel according to the temperature of a valve core. An oil cooler in the prior art is split into the first oil cooling channel and the second oil cooling channel, but the heat exchange amount of the oil cooler is kept unchanged. When the air compressor works under the load of 20-100%, the heat of the screw oil and the heat exchange amount of the oil cooler are basically balanced, the exhaust temperature is stable, no condensate water is separated out in the working process, and the service life of the screw oil and the service life of a screw machine body bearing are prolonged; and the start-stop frequency of the cooling fan is reduced, the service life of the cooling fan is prolonged, and the reliability of the cooling fan is improved.

Description

technical field [0001] The invention relates to the technical field of screw air compressors, in particular to an oil-gas cooler of a variable frequency oil injection screw air compressor and a system thereof. Background technique [0002] When the frequency conversion oil injection screw air compressor is working, the screw oil discharged from the screw body is cooled by the oil cooling system and then enters the screw body. Using existing oil cooling system, if attached figure 1 and figure 2 As shown, the outlet of the screw body is equipped with a temperature sensor to detect the exhaust temperature. The outlet of the screw body is also connected to an oil-gas barrel for separating oil and gas. The screw oil outlet of the oil-gas barrel is connected to an oil cooler. The oil cooler has The cooling fan provides the ground air needed to cool the screw oil for heat dissipation. The outlet of the oil cooler is connected to an oil filter, and the outlet of the oil filter is...

AI Technical Summary

Problems solved by technology

[0009] (1) When the air compressor works at a load of 20%-65%, it will produce condensed water, which will shorten the life of the screw oil and the bearing of the screw body

[0010] (2) When the air compressor works at a load of 20%-65%, the screw oil is over-cooled to varying degrees, resulting in a wide range of temperature fluctuations of the screw oil entering the screw body, so that the exhaust temperature of the screw body fluctuates greatly

[0011] (3) When the air compressor is working at a load of 0%-65%, the cooling fan starts and stops frequently

[0012] (4) When the air compressor is working at a load of 0%-65%, the cooling fan stops for a long time, so that the temperature of the compressed air discharged from the air compressor is high for a long time, which is not conducive to the drying and filtering of compressed air

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