| 摘要 |
<p>1,197,215. Unloading liquids. DIESSEL G.m.b.H. & CO. 6 Nov., 1967 [10 Dec., 1966], No. 50298/67. Heading B8E. [Also in Division F1] Apparatus for the reception and measurement of liquids, such as milk, from road tankers 1, Fig. 1, capable of gravitationally discharging an initial quantity of liquid to the apparatus comprises a suction hose 2 attachable to the tanker and connected to an air eliminator 3, which is followed in succession by a pump 4, a volumetric flow measuring device 6 and a non-return valve 7. Liquid entering the air eliminator 3 under gravity displaces air which escapes through a one-way pressure-actuated vent valve 11. The pump 4 is then started, either manually or automatically, the resultant partial vacuum in the air eliminator 3 closing the vent valve 11. When the tanker 1 has been emptied and the liquid level in the air eliminator 3 has consequently fallen to a predetermined low level, a control means operated automatically in accordance with the liquid level stops the pump. The control means may comprise a float containing a ring magnet which co-operates with upper and lower control elements which switch the pump on and off, respectively. Alternatively, the pump may be switched on and off by means of upper and lower electrodes 15, 14, Fig 3, which sense the liquid level 20. Instead of being carried by a vent pipe as in Fig. 1, the vent valve 11 may be mounted as shown in Fig. 3, and in this case an additional vent valve 13.1 is provided. Valve 13.1 is closed by a float 13 when the liquid has risen to a predetermined high level during the initial gravity filling of the air eliminator 3. Consequently, the valve 11 also closes. Instead of being started when the liquid level reaches the electrode 15, the pump may be started after a time delay, following the covering of the electrode 14. Alternatively, the pump may be started by hand when the valve 13.1 closes. The automatic means for starting the pump may comprise a capacity switch.</p> |
