A full-sealing positive pressure and negative pressure integrated oil-free compressor for oxygen generation, comprising a motor, a vacuum air passage structure, a supporting body, a positive pressure air passage structure and air cylinders, wherein the vacuum air passage structure, the supporting body and the positive pressure air passage structure are fixedly mounted on an upper surface of the motor in sequence, the positive pressure air passage structure does not communicate with the supporting body, no air passage is arranged on a surface of the supporting body, the air cylinders comprise two negative pressure vacuum air cylinders and two positive pressure compression air cylinders, the negative pressure vacuum air cylinders and the positive pressure compression air cylinders are fixedly mounted on four side surfaces of the supporting body in an alternating mode, the two negative pressure vacuum air cylinders communicate with the vacuum air passage structure, the two positive pressure compression air cylinders communicate with the positive pressure air passage structure, an eccentric wheel group is assembled on an output shaft of the motor, piston rods are assembled on an outer surface of the eccentric wheel group, the four piston rods are assembled in the corresponding air cylinders respectively, leather cup pressing plates are fixedly mounted on outer end faces of the piston rods, and leather cups are assembled at outer ends of the piston rods through the leather cup pressing plates;
- the vacuum air passage structure comprises a vacuum air passage supporting body, vacuum air passage valve chambers are symmetrically formed in an upper surface of the vacuum air passage supporting body, two negative pressure suction and exhaust passages and four negative pressure vacuum air cylinder connecting air passages which communicate with the vacuum air passage valve chambers are formed in side surfaces of the vacuum air passage supporting body, the two negative pressure suction and exhaust passages are located in the symmetrical side surfaces of the vacuum air passage supporting body, the four negative pressure vacuum air cylinder connecting air passages are uniformly located in the other side surfaces of the vacuum air passage supporting body, the negative pressure suction and exhaust passages are connected with pipe joints, and the negative pressure vacuum air cylinder connecting air passages communicate with the negative pressure vacuum air cylinders;
- the positive pressure air passage structure comprises a positive pressure air passage supporting body, positive pressure air passage valve chambers are symmetrically formed in an upper surface of the positive pressure air passage supporting body, two positive pressure compression exhaust passages and four positive pressure compression air cylinder connecting air passages which communicate with the positive pressure air passage valve chambers are formed in side surfaces of the positive pressure air passage supporting body, the two positive pressure compression exhaust passages are located in the symmetrical side surfaces of the positive pressure air passage supporting body, the four positive pressure compression air cylinder connecting air passages are uniformly located in the other side surfaces of the positive pressure air passage supporting body, the positive pressure compression exhaust passages are connected with pipe joints, and the positive pressure compression air cylinder connecting air passages communicate with the compression air cylinder connecting air passages communicate with the positive pressure compression air cylinders air cylinders;
- each air cylinder comprises an air cylinder main body and an air cylinder valve chamber cover, wherein the air cylinder valve chamber cover is assembled on an outer surface of the air cylinder main body, the air cylinder main body is fixedly mounted on the supporting body, two air cylinder valve chambers which are arranged symmetrically are formed in the outer surface of the air cylinder main body, air exchange holes which communicate with the two air cylinder valve chambers are formed in a surface of the air cylinder main body, the air exchange holes correspond to the negative pressure vacuum air cylinder connecting air passages or the positive pressure compression air cylinder connecting air passages, a compression cavity is formed in an inner surface of the air cylinder main body, the piston rod is movably assembled in the compression cavity, a plurality of vent holes are formed in an inner surface of the compression cavity, and the plurality of vent holes are located in the two air cylinder valve chambers respectively;
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- each air cylinder further comprises a negative pressure valve sheet, a negative pressure valve sheet pressing plate, a positive pressure valve sheet and a positive pressure valve sheet pressing plate, wherein the negative pressure valve sheet is fixedly mounted on an inner surface of the air cylinder valve chamber through the negative pressure valve sheet pressing plate, the positive pressure valve sheet is fixedly mounted on the inner surface of the compression cavity through the positive pressure valve sheet pressing plate, the negative pressure valve sheet and the positive pressure valve sheet block the vent holes in the different air cylinder valve chambers, a shape of the negative pressure valve sheet pressing plate is the same as a shape of the negative pressure valve sheet, and an outer end of the negative pressure valve sheet pressing plate is lifted in an arc towards an outer side.