Piston set and compressor thereof

Abstract

This invention discloses a piston set and a compressor thereof. The piston set is disposed in a cylinder of a compressor and comprises a piston and two piston rings. The piston is a rod-shaped structure installed in a ring-shaped groove close to the periphery of both ends of the piston. At least one interference element is formed at the bottom surface of each of the grooves. The two piston rings are installed in the grooves of the piston and being tilted by the interference element respectively. By such arrangements, the invention can improve the air tightness and cooling capacity of the compressor.

What is claimed is: 
     
         1 . A piston set, installed at a cylinder of a compressor, comprising:
 a piston, having ring-shaped grooves respectively concavely formed at a position proximate to peripheries of both ends of the piston, and at least one interference element disposed at a bottom surface of each groove; and   two piston rings, sheathed into the grooves of the piston and being tilted by the interference element respectively, wherein when the piston set performs reciprocal motion within the cylinder, gas enters the cylinder through the piston, so that each of the piston rings extends outwardly from a center axis to make actual contact with a sidewall of the cylinder.   
     
     
         2 . The piston set of  claim 1 , wherein each of the interference elements is protruded axially outward from the piston, and has a bottom-to-top distance falling within a range from 0.15 mm to 0.2 mm. 
     
     
         3 . The piston set of  claim 1 , wherein each of the interference elements has a cross-section of a triangular structure, a rectangular structure or an arc structure coupling to two sidewalls of the groove. 
     
     
         4 . The piston set of  claim 3 , wherein if the cross-section of each of the interference element is the rectangular structure, a sidewall of each of the interference element is coupled to one of the sidewalls of each groove. 
     
     
         5 . The piston set of  claim 1 , wherein each of the piston ring is deformed to form a conical ring-shaped structure during a practical operation, and each of the piston ring has a first opening and a second opening, and the first opening has a size greater than that of the second opening, and the piston has a bevel formed at edges of both ends, and the piston rings are sheathed from the ends of the piston into the two grooves by using the second openings and the two bevels respectively. 
     
     
         6 . A compressor, comprising:
 a compressor body, having a cylinder; and   a piston set, installed at the cylinder, comprising:   a piston, having ring-shaped grooves respectively concavely formed at a position proximate to peripheries of both ends of the piston, and at least one interference element protruded outwardly and axially from a bottom surface of each respective groove, and a bottom-to-top distance of each of the interference element falls within a range from 0.05 mm to 0.3 mm; and   two piston rings, sheathed into the two grooves of the piston and being tilted by the interference element respectively, wherein when the piston set performs reciprocal motion within the cylinder, gas enters the cylinder through the piston, so that each of the piston rings extends outwardly from a center axis to make actual contact with a sidewall of the cylinder.   
     
     
         7 . The compressor of  claim 6 , wherein each of the interference elements has the bottom-to-top distance falling within a range from 0.15 mm to 0.2 mm. 
     
     
         8 . A piston set, installed at a cylinder of a compressor, comprising:
 a piston, having ring-shaped grooves respectively concavely formed at a position proximate to peripheries of both ends of the piston, at least one interference element protruded outwardly and axially from a bottom surface of each respective groove, a chamber axially and concavely formed at a position proximate to at least one part of the periphery of the other end of the piston, and a ring-shaped recess portion axially and concavely formed between the groove and the chamber; and   a piston ring, sheathed into the groove of the piston and being tilted by the interference element, wherein when the piston set performs reciprocal motion within the cylinder, gas enters the cylinder through the piston, so that the piston ring extends outwardly from a center axis to make actual contact with a sidewall of the cylinder.   
     
     
         9 . The piston set of  claim 8 , wherein the interference element has a bottom-to-top distance falling within a range from 0.15 mm to 0.2 mm. 
     
     
         10 . The piston set of  claim 8 , wherein the interference element has a cross-section of a triangular structure, a rectangular structure or an arc structure coupling to two sidewalls of the groove. 
     
     
         11 . The piston set of  claim 10 , wherein if the cross-section of each of the interference element is the rectangular structure, a sidewall of each interference element is coupled to one of the sidewalls of each groove. 
     
     
         12 . The piston set of  claim 8 , wherein the piston ring is deformed to form a conical ring-shaped structure during operation, and the piston ring has a first opening and a second opening, and the first opening has a size greater than that of the second opening, and the piston has a bevel formed at an edge thereof, and the piston ring is sheathed into the groove from the end of the piston by using the second opening and the bevel.