An oil-injected scroll air compressor with back pressure structure

Abstract

The invention relates to an oil injection vortex air compressor of a back pressure structure. The oil injection vortex air compressor comprises a fixed vortex plate, a movable vortex plate, a crossed slide ring, a crankshaft, a machine frame, a main counterbalance, an auxiliary bearing pressure ring, a rear cover, a belt wheel, an eccentric bearing, a main bearing and an auxiliary bearing. The movable vortex plate and the fixed vortex plate are meshed to form a compression cavity. The crankshaft is installed in the machine frame through a main bearing and an auxiliary bearing. The eccentric part of the crankshaft is installed on a hub of the movable vortex plate. The crankshaft and the movable vortex plate are fixedly installed through the eccentric bearing. A back pressure cavity is formed by an inner cavity space between the back side of the movable vortex plate and the machine frame. An air compression cavity is formed by a gap between the front side of the fixed vortex plate and the movable vortex plate. At least one back pressure through hole for making the back pressure cavity communicated with the air compression cavity is formed in the movable vortex plate. An oil outlet and an oil supply hole are formed in the machine frame. An oil return passageway is an oil return way which is arranged in the side wall of the machine frame and makes an air suction pressure cavity communicated with the back pressure cavity. The oil injection vortex air compressor greatly improves compression efficiency and is more stable in running.

Description

technical field [0001] The invention relates to a compressor, in particular to an oil-injected scroll air compressor with no sealing structure and back pressure cavity between the back side of the moving disk and the frame. Background technique [0002] Scroll air compressors are widely used in industrial, agricultural, transportation and other industries where compressed air is needed due to their high efficiency, low noise, small size, and benefits for energy saving and environmental protection. The main moving part of the scroll air compressor is the scroll, which is only meshed and does not produce wear, so the service life is longer than that of the piston and screw compressors. It is an ideal power source for pneumatic machinery. In the scroll air compressor, the scroll of the main moving part is divided into a moving scroll and a fixed scroll, and the moving scroll and the fixed scroll are equipped with a scroll piece. The scrolls are combined with each other to form...

AI Technical Summary

Problems solved by technology

The method is to use a scroll air compressor with a fixed radial clearance. The radial clearance between the fixed scroll and the movable scroll (that is, the gap between the top and bottom of the scroll blade) is mainly determined by processing and Assembling guarantee, in order to ensure that the mechanical jam between the movable scroll and the fixed scroll does not occur due to thermal expansion and pressure deformation during the operation of the scroll air compressor, the radial clearance needs to be set to a certain value, which will cause compression More radial leakage during the process, causing a decrease in compression efficiency

In such a compressor structure with fixed radial clearance, in order to improve the compression efficiency, the radial clearance must be reduced, which increases the probability of mechanical seizure

Moreover, the compressor structure with a fixed radial gap has high requirements for processing accuracy. To ensure the uniformity of the radial gap, it is necessary to improve the shape and position accuracy of processing, and grouping technology is required during assembly, which causes processing And the rise of assembly cost will eventually cause the cost of the compressor to rise and the competitiveness of the compressor to decline

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