| 摘要 |
<p>892,389. Mixing solids with liquids in flow. FISCHER & PORTER CO. Oct. 20, 1958 [Feb. 5, 1958], No. 33435/58. Class 86. [Also in Groups VIII, XIX and XXIX] A device 2 for measuring the solids concentration of a slurry &c. e.g. paper pulp comprises a casing 4 forming a passage for the slurry and having an inlet and a discharge opening, obstructions 30 in the path of the slurry to subject it to shear and means 64 to measure the stress in shear of the slurry, the spaced obstructions occupying less than 30% of any cross-sectional area of the flow path. The fibrous slurry passes from a stock chest 104, Fig. 3, through a pipe system 106 in which it is diluted by water from a line 108 and is delivered by a pump 102 to the device 2 from which it is discharged into line 110. As the slurry meets projecting rods 30, Fig. 1, it is sheared and the resultant force moves a drag body 19 upwardly. The body 19 comprises a sleeve 20, mounted on a stem 18, and rods 30 inserted in bores 32, 34, 36, 38, 40, adjacent bores having their axes 90 degrees apart. The stem 18 exerts a force on a lever 68, Fig. 2, pivotally mounted on a diaphragm 70, through a pressure balanced diaphragm 64 and link 76. The lever 68 transmits the force to a transducer 98 supplied with air by a line 116 which converts the force exerted by the lever 68 to a pneumatic or electrical output to give a signal to a recorder-controller 120 connected to an air supply line 122 and which has previously been adjusted to give the desired solids concentration at the output. Change in the signal transmitted to the recorder-controller 120 causes an opening or closing of a valve 128 which increases or decreases the flow of water in the line 108 and hence alters the solids concentration. A purge line 94 provides a flow of water to a chamber 82, Fig. 2, formed by a diaphragm 84, a hydraulic line 80 and a casing 54 to prevent plugging of the material in the slurry. Oil is contained in a body 66 between the diaphragms 64 and 84. In a modification, not shown, the projecting rods 30 are replaced by a number of obstruction members fixed to the casing, adjacent members being positioned 90 degrees apart from each other. A differential pressure transmitter measures the difference in pressure between the upstream and downstream sides of the obstructions.</p> |
