초록 ▼

A lubricated piston rod seal which inhibits gas leaking from a high pressure chamber on one side of the seal to a low pressure chamber on the other side of the seal. A liquid is supplied to the surface of the piston rod on the low pressure side of the seal. This liquid acts as lubricant for the seal

A lubricated piston rod seal which inhibits gas leaking from a high pressure chamber on one side of the seal to a low pressure chamber on the other side of the seal. A liquid is supplied to the surface of the piston rod on the low pressure side of the seal. This liquid acts as lubricant for the seal and provides cooling for the rod. The seal, which can be a plastic, elastomer or other material with low elastic modulus, is designed to positively pump lubricant through the piston rod/seal interface in both directions when the piston rod is reciprocating. The capacity of the seal to pump lubricant from the low pressure side to the high pressure side is less than its capacity to pump lubricant from the high pressure side to the low pressure side which ensures that there is zero net flow of lubricant to the high pressure side of the seal. The film of lubricant between the seal and the rod minimizes any sliding contact and prevents the leakage of gas. Under static conditions gas leakage is prevented by direct contact between the seal and the rod.

대표청구항 ▼

A seal assembly for preventing gas leakage along a reciprocating member between a first gas chamber and a second gas chamber, including a wall through which said member extends and separating said first chamber and said second chamber; means for supplying a lubricant to the surface of said reciproca

A seal assembly for preventing gas leakage along a reciprocating member between a first gas chamber and a second gas chamber, including a wall through which said member extends and separating said first chamber and said second chamber; means for supplying a lubricant to the surface of said reciprocating member in at least one of said first and second gas chambers; a sealing gland having a first and second end and held against the wall between the first chamber and the second chamber; the improvement comprising: means for mounting said sealing gland to said reciprocating member to provide for a predetermined radial load; means at said first end of said sealing gland proximate the lubricant supply forming a first convergent passage between said gland and said reciprocating member operative to effect lubricant pumping in the direction into said sealing gland and sufficient to overcome said radial load and establish a finite lubricant film between the confronting surfaces of the reciprocating member and the sealing gland; means at said second opposite end of said sealing gland forming a second convergent passage between said gland and said reciprocating member to effect lubricant pumping in the direction into said sealing gland sufficient to at least balance the flow of lubricant being pumped from said first end of said sealing gland.