GB959441A - Measuring apparatus - Google Patents

Abstract

959,441. Viscosimeters; dynamometers. SOC. FRANCAISE DES REGULATEURS UNIVERSELS ARCA. June 10, 1960, No. 20475/60. Headings G1S and G1W. [Also in Division D2]. Apparatus for measuring torque comprises a vane 14 and nozzle 9 carried respectively by shafts 16, 17 and a pipe 10 supplying air under pressure to the nozzle 9 whereby, when one shaft is rotated, the other is driven against the torque to be measured by a jet issuing from the nozzle 9 and impinging perpendicularly on the vane 14 so that with a constant speed of rotation, the pressure read on gauge 11 is a measure of the torque. Fig. 4 shows the_apparatus in use for measuring the viscosity of a liquid passing through a closed chamber 36 in the direction of the arrows. A hollow shaft 24 through which air is passed from a source 32 is rotated at constant speed by a motor 29. A second hollow shaft 21 supported on an extension of the shaft 24 carries a sphere 18 immersed in the liquid being tested. A nozzle 26 formed on the end of the shaft 24 as in Fig. 3 blows a stream of air on to the vane 23 carried by the shaft 21. The pressure set up behind the nozzle 26 is read on a gauge 34 and varies in accordance with the viscosity of the test liquid. Air from the nozzle is returned to the atmosphere by a conduit 40. In the embodiment of Fig 2 (not shown), the sphere 18 is immersed in a liquid contained in an open tank. The pressure set up may be used to keep viscosity constant by using the pressure to control temperature or to control the introduction of a secondary liquid e.g. in producing an oil of given viscosity or in adjusting the consistency of paper pulp by the addition of water.