Muffler device and compressor having the same

A compressor, comprising:

• a housing;
• a compression assembly provided inside the housing;
• an air inlet and an exhaust port provided in the housing;
• and
• a muffler device mounted at the exhaust port, the muffler device comprising:
• a sound hood including an expanding cavity that is defined inside the sound hood, the sound hood further including an acoustic wave inlet and an acoustic wave outlet, the acoustic wave inlet and the acoustic wave outlet being communicated via the expanding cavity, and
• a microporous plate in a shape of a truncated cone, which is disposed inside the expanding cavity and divides the expanding cavity into a first cavity body and a second cavity body, and
• a plurality of through holes provided on the microporous plate such that a high-speed air flow that is discharged from the exhaust port and enters the expanding cavity exits the expanding cavity after passing through the plurality of through holes of the microporous plate, the high-speed air being accompanied by noisy acoustic waves,
• wherein the first cavity body is directly in communication with the acoustic wave inlet and the acoustic wave outlet, and the second cavity body is in communication with the first cavity body via the plurality of through holes of the microporous plate,
• wherein the truncated cone shape has a first end and a second end, wherein at least one of the first end and the second end is smaller than at least one of the acoustic wave inlet and the acoustic wave outlet, and
• wherein the expanding cavity and the shape of the microporous plate are configured to alter the direction of the air flow so that the noisy acoustic waves are constantly refracted and/or reflected in the second cavity body of the expanding cavity to make the phase difference between incident noisy acoustic waves and reflected noisy acoustic waves be 180 degrees so that the incident noisy acoustic waves and reflected noisy acoustic waves can cancel each other out;
• wherein an outer wall of the sound hood is formed with secondary openings, and the second cavity body is in communication with the outside of the sound hood via the secondary openings.

A compressor, comprising:

• a housing;
• a compression assembly provided inside the housing;
• an air inlet and an exhaust port provided in the housing;
• and
• a muffler device mounted at the exhaust port, the muffler device comprising:
• a sound hood including an expanding cavity that is defined inside the sound hood, the sound hood further including an acoustic wave inlet and an acoustic wave outlet, the acoustic wave inlet and the acoustic wave outlet being communicated via the expanding cavity, and
• a microporous plate in a shape of a truncated cone, which is disposed inside the expanding cavity and divides the expanding cavity into a first cavity body and a second cavity body, and
• a plurality of through holes provided on the microporous plate such that a high-speed air flow that is discharged from the exhaust port and enters the expanding cavity exits the expanding cavity after passing through the plurality of through holes of the microporous plate, the high-speed air being accompanied by noisy acoustic waves,
• wherein the first cavity body is directly in communication with the acoustic wave inlet and the acoustic wave outlet, and the second cavity body is in communication with the first cavity body via the plurality of through holes of the microporous plate,
• wherein an outer wall of the sound hood is formed with secondary openings, and wherein the second cavity body is in communication with the outside of the sound hood via the secondary openings, and
• wherein the expanding cavity and the shape of the microporous plate are configured to alter the direction of the air flow so that the noisy acoustic waves are constantly refracted and/or reflected in the second cavity body of the expanding cavity to make the phase difference between incident noisy acoustic waves and reflected noisy acoustic waves be 180 degrees so that the incident noisy acoustic waves and reflected noisy acoustic waves can cancel each other out.