Noise elimination and vibration damping device for air compressor and air compressor

A noise elimination and vibration damping device for an air compressor, wherein an air compressor vent (1) is provided with an inner sleeve (2) therein, a fixed end (2-1) at an end of the inner sleeve (2) is connected to an inner wall surface of the air compressor vent (1), a suspended end (2-2) at another end of the inner sleeve (2) is in a suspended state;

• a groove (11) is arranged on the air compressor vent (1), and a space between the groove (11) and the inner sleeve (2) defines a noise elimination chamber (6);
• the noise elimination chamber (6) is provided with a plurality of noise elimination regions arranged at intervals, and each of the plurality of noise elimination regions is filled with magnetic fluid (4);
• a first-stage noise elimination structure (7) is disposed on the inner sleeve (2);
• and the suspended end (2-2) is configured to, under radial oscillation generated by the suspended end (2-2), drive the magnetic fluid (4) in the plurality of noise elimination regions to generate tangential oscillation, thereby attenuating acoustic energy of a sound entering the noise elimination chamber (6);
• wherein an outer wall surface of the air compressor vent (1) corresponding to each of the plurality of noise elimination regions is provided with a magnetic device (8), and the magnetic device (8) is configured to, under a magnetic field generated by the magnetic device (8), limit a flow of the magnetic fluid (4);
• and
• wherein the magnetic device (8) is connected to a linear moving mechanism (9), and the linear moving mechanism (9) is configured to drive the magnetic device (8) to move along an axial direction of an outlet of the air compressor, thereby changing a distance between the magnetic fluid (4) in the plurality of noise elimination regions and the suspended end (2-2) so as to change a frequency of the radial oscillation generated by the suspended end (2-2).