| 摘要 |
<p>The improved packing rings described in detail hereinafter provide an integrally formed, internally located check valve for use in the lubrication systems compressors, pumps or the like. Specifically, and in the preferred form, two adjacent packing rings include face portions arranged in sealing engagement with at least one of the packing rings a lubricant passageway therein. An arcuate groove is formed in the face of one of the packing rings in communication with the lubricant passageway. One of the packing rings includes a pressure-responsive, integrally formed annular lip that encompasses the arcuate groove. The arrangement is such that a predetermined pressure in the lubricant groove moves the lip away from the adjacent packing ring permitting lubricant to pass out of the arcuate groove into the interior of the compressor. During the compression stroke of the compressor, the high pressure existing inside the compressor acts on the pressure responsive lip forcing it into tighter sealing engagement with the adjacent packing ring preventing the compressor pressure from entering the lubrication system.</p> |
