| 摘要 |
1,158,289. Liquid level indicators. VDO TACHOMETER WERKE ADOLF SCHINDLING G.m.b.H. Nov.23, 1966 [Dec. 2, 1965; April 1, 1966], No.52500/66. Heading G1H. Apparatus for measuring the liquid level in a container 1 comprises an air chamber 2 connected to a pressure meter (not shown), liquid being drawn from the container through an outlet conduit by means of a pump (not shown) and a portion of the withdrawn liquid into which air is directly introduced by a jet nozzle assembly 6, 7 being recycled by the pump into the air chamber. Liquid is introduced into the container through a filling pipe 1a and flows through holes in the air chamber 2 wherein it rises to the top of a tube 4. Air in the chamber escapes through the tube 4, the nozzle 7 and an air conduit 9 until further introduction of liquid results in liquid entering the tube 4 so that the air pressure builds up in the chamber 2. On starting the pump, the output side of which is connected to a conduit 8, a small portion of the liquid delivered by the pump flows back to the container through the conduit 8 and the nozzles 6, 7 causing a suction in a space 11 so that all the liquid in the conduit 9 followed by air from a venting pipe 12 is ejected into the tube 4. The air pressure in the chamber 2 therefore increases and the liquid level in the chamber drops until it reaches the holes 14. Further air entering the chamber merely bubbles out through the holes and the pressure in the chamber, which equals the hydrostatic pressure due to a head of water 'h' is registered on the pressure meter connected by a conduit 10 to a tube 13. On stopping the pump, liquid in the tube 4 passes through the nozzle 7 and flows up the conduit 9 to the level of the liquid in the container. The pressure indicated on the meter is a measure of the height of liquid in the container. Figs.2, 3 (not shown), illustrate modifications of the apparatus for use with differently shaped containers whilst Fig. 4 (not shown) illustrates the modifications necessary to fit the apparatus to a wall of and near the bottom of a container. |
