| 摘要 |
<p>1,200,813. Regulating fluid-flow. PERKINELMER CORP. Jan.9, 1968 [Jan. 9, 1967], No.1314/68. Heading G3H. [Also in Division B1] Apparatus for mixing two liquids, gases or vapours comprises a fluid-flow impedance network (as shown, a pneumatic network for mixing gases or vapours) having inlets 12, 14 to which the fluids are respectively supplied at regulated (and preferably equal) pressures and comprising flow restricting impedances 54 to 76 having outlets 36-44 and arranged so that a mixture of the two fluids is available from each outlet in concentration differing e.g. by a factor of 10. The impedances may be capillary tubes of differing lengths, or tubes packed with sand or glass beads. The outlets may selectively be coupled to the point of use by a manually operated rotary valve (46), see Figs.1 and 4 (not shown) or by an arrangement of vents and stop-cocks see Fig. 5 (not shown). Tubular mixing chambers (112), Fig.6 (not shown) may be introduced at the junctions of the impedances. The two fluids may be two streams of an inert carrier gas such as nitrogen or helium, one stream of which has been passed through a liquid to saturate it with vapour, see Fig. 4 (not shown). The apparatus may be used in the calibration and testing of gas chromatographs.</p> |
