Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Content or effect of a constituent of a liquid mixture
Patent
1985-01-07
1987-01-13
Levy, Stewart J.
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Content or effect of a constituent of a liquid mixture
7386383, 162263, G01N 1106
Patent
active
046354700
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an apparatus and a method for permeability measurement, said apparatus is provided for sampling a suspension passing through a pipe, particularly a fibrous suspension, and comprises a sampling cylinder housing attachable round an opening made in the wall of the pipe, the housing being open towards the interior of the pipe and accommodating concentrically an axially displaceable sampling cylinder, adapted for taking a suspension sample from the pipe for the purpose of determining its permeability or freeness level and also the permeability of a sample impoverished of fines or smaller fibre fragments.
Drainage transmitters or meters provided so far usually have a very complicated structure, which results in expensive service, as well as the installation of these meters in a pulp line requiring special arrangements. Due to this the weight of this type of meter rarely falls below 50 kg, which makes dismantling the meter more difficult when it is to be cleaned, for example. Other problems with this kind of meter is that they are easily blocked up by fibers remaining from the fiber suspension after sampling. These meters moreover lack the possibility of determining the permeability of the long fiber portion of the pulp sample.
The present invention has the object of providing a drainage rate transmitter of the kind mentioned in the introduction, which is substantially distinguished in that the sampling piston has a cylindrically formed through-hole at right angles to its longitudinal direction, the hole forming a sample chamber, such that when the sampling piston is in its retracted position inside the housing the chamber is in register with at least one hole of substantially the same diameter in the cylindrical surface of the housing, for connecting to it a preferably cylindrical casing defining a mixing and dilution chamber, in which there is an agitating or mixing device, the casing being provided with two opposing openings, of which one has the same diameter as the hole in the cylindrical surface of the housing and the other has a shape affording sealing connection to an end wall member carrying a screening plate, said member being provided with a drainage collection duct under the screening plate for conveying measuring water passing through a fibre bed formed on the screening plate to measuring means for determining the drainage properties of the sample taken, and also of a sample which has been completely or partially liberated from smaller fibre fragments by a special separation method. By the sample-taking chamber being arranged in line with the spaces required for achieving a homogenous pulp bed from a suspension sample there is obtained according to the invention better formation or growth of the pulp on the screening plate, as well as complete flushing after each sampling procedure, since there are no dead spaces where the remains of previous samples can catch and negatively affect the measuring result. The simple construction means that no heavy details need to be removed for inspecting the screen and neither are any tools required, since the cylindrical wall and the end wall member carrying the screening plate with the intermediate mixing chamber may be fastened to the housing with the aid of toggle catches.
The present invention also relates to a method of determining the permeability, particularly in a fibre suspension, the method being substantially distinguished in that smaller fibre fragments in a pulp sample introduced into the measuring or mixing chamber, after filtering against the screening plate and subsequent permeation of water during one or more pressure drops, possibly after slushing by agitation of the pulp bed built up against the screening plate between the different measurements, are removed by once again bringing the pulp bed into suspension by slushing with the aid of the mixing or agitating means and a simultaneously applied flow of water, after which the fibre suspension, substantially impoverished of fine material, is once again filtered again
REFERENCES:
patent: 1966712 (1934-07-01), Fisher et al.
patent: 1970521 (1934-08-01), Harvey
patent: 3847022 (1974-11-01), McGinnis
patent: 3949614 (1976-04-01), Abonnenc
patent: 4114427 (1978-09-01), Iguchi et al.
patent: 4262533 (1981-04-01), Jaeger
patent: 4269064 (1981-05-01), Johnson et al.
patent: 4475410 (1984-10-01), Jaeger
Gren Urban
Ljungkvist Kjell
Skallen Bengt
Eur-Control Kalle AB
Levy Stewart J.
Williams Hezron E.
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