The present invention relates to a centrifugal compressor using a dry gas seal system for protecting seal means. A multistage centrifugal compressor has primary dry gas seal means for preventing leakage of working gas from a machine inner side, and secondary dry gas seal means for backing up the first dry gas seal means. A seal gas line for introducing the gas leaked from the first and second dry gas seal means to the outside of the machine is installed between the primary dry gas seal means and the secondary dry gas seal means. The gas seal line has an orifice and a check valve, and buffer means is installed between the orifice and the check valve.
Description
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING
FIG. 1 is a block diagram of one embodiment of a centrifugal compressor according to the present invention; and
FIG. 2 is a schematic view of a dry gas seal used for a centrifugal compressor shown in FIG. 1.
Claims
1. A multistage centrifugal compressor including primary dry gas seal means for preventing leakage of working gas from a machine inner side, and secondary dry gas seal means for backing up the first dry gas seal means, wherein there is provided a seal gas line for introducing the gas leaked from the first and second dry gas seal means to an outside of a machine between the primary dry gas seal means and the secondary dry gas seal means, the real gas line having an orifice and a check valve, and wherein buffer means is installed between the orifice and the check valve.
2. The centrifugal compressor according to claim 1, wherein said buffer means is an accumulator.
3. The centrifugal compressor according to claim 2, wherein said centrifugal compressor is a uniaxial multistage compressor, in which a plurality of centrifugal impellers are mounted to a same shaft.
4. A dry gas seal system used for a multistage centrifugal compressor and introducing leak gas leaked from a machine to an outside of the machine, said system having dry seal means arranged in the machine, a channel for introducing the leak gas leaked from the dry seal means, two flow meters continuously arranged in a downstream side of the channel, restriction means arranged on a downstream side of the two flow meters, buffer means arranged on a downstream side of the restriction means, and a check valve arranged on a downstream side of the buffer means.
5. The dry gas seal system according to claim 4, wherein said restriction means is an orifice and said buffer means is an accumulator.
Patent Application
20070147988
