| 摘要 |
<p>The refrigerator with a multistage compressor has a control system for ensuring oil return from the compressor chambers to the crankcase. The latter is at a higher pressure than the inlet of the first stage, the inlet valve plates being lifted, for facilitating starting and regulation, by oil pressure. Each compressor stage has an oil collector connected to a suction chamber of a compressor stage. The oil collectors are also connected to each other by the crankcase. The oil pump for valve lifting actuators is connected to the oil collector vessel of the first stage. The oil pump has a connection to the crankcase, and this connection pipe has a valve controlled by liquid level in the oil collector vessel.</p> |
