| 单词 | junk ring |
| 释义 | > as lemmasjunk ring junk ring n. Engineering (a) (in various mechanisms) a metal ring which secures packing or stuffing that prevents leakage of fluid around a piston rod or other moving part; (b) a metal ring forming a tight seal against leakage in the cylinder of a steam engine or internal combustion engine, typically fitted either to the top of the piston or inside the head of the cylinder. ΘΚΠ society > occupation and work > equipment > machine > parts of machines > piston > [noun] > parts of piston valve1735 piston rod1753 piston ring1754 piston head1824 gland1839 junk ring1839 slipper block1881 tail-rod1894 scraper ring1918 1839 R. S. Robinson Naut. Steam Engine Explained 41 On the top of the packing rings comes the junk ring, which occupies the whole space from the boss of the piston to the sides. 1916 Sci. Amer. 1 Jan. 19/3 This junk ring plays an important part, for it seals the combustion chamber on the compression stroke. 1995 Proc. 3rd Internat. Conf. CANDU Maintenance (Canad. Nuclear Soc.) 351/2 The bottom of most stuffing boxes is an unknown quantity so a junk ring (generally called a guide bushing in control valves) is installed to provide a solid foundation for the packing set and to guide the valve stem. < as lemmas |
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