| 摘要 |
<p>Milk is sucked out of the farmer's container (4) and injected into a degassing vessel (12) in a tangential direction, forming a paraboloid liquid surface (14). The air above the surface is evacuated by one or two ejectors (30,32) and drawn through a foam separator (44). Milk is sucked out of the farmer's container (4) and injected into a degassing vessel (12) in a tangential direction, forming a paraboloid liquid surface (14). The air above the surface is evacuated by one or two ejectors (30,32) and drawn through a foam separator (44). The ejectors are driven by compressed air and the whole vacuum system is controlled by valves (36,38,40,42,48) according to commands from a control unit (50). The milk is withdrawn from the degassing vessel also through a tangential outlet to pump (24) and through flowmeter (26). The information from this flowmeter is used to print bar-chart labels to identify the supplier and the amount of milk supplied. Foam from the separator is passed into the degassing vessel at the end of the cycle. Fluid levels are measured by a float (18) guided by a rod (16). Both ejectors are used at the start and near the end of the cycle to provide high vacuum. Only one ejector then works for the major part of the transfer process. The end of the cycle the ejectors are switched off and the system is opened to atmosphere.</p> |
