Compressor coupling guard oil return line and exhaust gas line
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Unit arrangement: motor – speed increase gearbox – compressor； The motor-side coupling guard is closed on one side and open on the other ； Both ends of the compressor side coupling guard are sealed ； Both coupling guards have oil return lines and smoke exhaust lines ； There has been an oil leakage issue with the compressor side coupling guard ； The fuel tank is evacuated by an exhaust fan. In my opinion, it is not necessary to install exhaust gas lines for the coupler guards on the motor side and the compressor side, as there is no large amount of lubricating oil present, so no significant amount of oil fumes will be generated; any minor amount of such fumes can be removed through the oil return line. If the tank vacuum level is insufficient and the fumes are not removed in a timely manner, it is likely to affect the coupling cover. How are two pipelines arranged in the engine coupling guard that everyone has seen?
Since this thing already exists, there’s no need to argue about it. This is something that one should understand if they have time to do so, considering the design era of the equipment as well as any subsequent technical upgrades. Oil leakage at this point is unacceptable, and it’s not possible to disassemble the device for inspection right away; one can only wait for an opportunity to do so in order to check whether there are any structural issues. It is indicated that more than 1/2 of the cross-section of the return pipe is filled with liquid, while the rest should be negative-pressure air leading to the fuel tank. The flow path in this section is as follows: air enters each dynamic sealing point, goes to the bearing housing, then to the oil return pipe, to the oil tank, to the range hood, and finally back to the atmosphere. The negative value of the range hood should not be too large, otherwise oil leakage will occur.
On the left in the diagram is the motor, and on the right is the gearbox; there is no smoke exhaust pipe above the coupling. The original poster’s analysis is correct – there is no need to install a smoke exhaust pipe
The marked position in the diagram should be where the O-ring is located