Screw compressors, especially screw compressors with intermittent operation for supply of compressed air to rail cars

摘要

In the case of screw compressors, which are provided for an interval mode for supply of compressed air to a screw compressor, in particular a rail car, the packing for the axial end 6 of the screw, which passes through the housing wall, And two nipples 13 and 14 which are adjacent to each other at the shaft end under self-stress and an oil chamber 15 located therebetween. The both nipples 13, 14 and the oil chamber 15 are positioned in the bearing cap 8 in accordance with the purpose. From the oil chamber 15, the uprising pipe 19 is directed toward the suction pipe 20 of the screw compressor and is connected to the suction pipe in a place higher than the oil chamber 15. The oil chamber 15 is pre-filled with oil and has an atmospheric pressure. The suction chamber side nipple 13 is formed to be suitable for receiving a high differential pressure. And the nipple 14 on the other side is subjected to force only by atmospheric pressure at both sides. Depending on the circumstances, the leaked oil entering the oil chamber 15 through the non-sealed nipple 13 is re-transferred to the suction pipe 20 through the riser pipe 19 and through it to the screw compressor. The airtightness through the nipple 14 is provided toward the outside, that is, toward the atmospheric side end shaft portion 6 when the nipple 13 which is more strongly urged is not airtight.