Measuring and testing – Sampler – sample handling – etc. – Flow divider – deflector – or interceptor
Patent
1980-08-04
1982-08-10
Swisher, S. Clement
Measuring and testing
Sampler, sample handling, etc.
Flow divider, deflector, or interceptor
7386351, G01N 120
Patent
active
043431992
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for taking from a flowing suspension a sample-flow which is of substantially constant flow rate and which is representative of the composition of said suspension, said device being of the kind which comprises a first chamber arranged to receive the flowing suspension and which communicates via a weir, with the upper part of a second chamber having first and second openings arranged at the bottom thereof for the removal of the sample-flow and the remaining part of the suspension respectively, said openings being separated from one another by partition walls which extend transversely of said weir over the whole length of the second chamber; and in which the second openings communicate with an outlet via a substantially U-shaped passage and a second weir whose lip is located substantially on the same level as the lip of the weir of the first chamber, while the first openings communicate with a second outlet which is so adapted that with normal flow of the suspension entering the first chamber the flow rate of said suspension into the first openings is substantially equal to the flow rate of said suspension into the second openings.
A device of this kind is known, for example, from U.S. Pat. No. 3,999,438. The accuracy of this known sampling device is extremely high when said device is used under favourable conditions, namely with large suspension flows which fluctuate only slightly. One disadvantage with the known device, however, is that when using said device to sample suspension flows which vary greatly, and in particular when sampling such flows which periodically halt completely, there is required a relatively large opening in the lower part of the U-shaped passage for removing sediment therefrom. In turn, the presence of this opening in the lower part of the U-shaped passage requires relatively large flows of suspension during a sampling operation, in order to ensure the requisite flow of suspension over the said second weir in order for a correct sampling result to be obtained.
The object of the present invention is to provide a sampling device of the kind hereinbefore described whose construction enables the aforementioned disadvantage to be at least substantially eliminated.
To this end it is proposed in accordance with the invention that at least one of said partition walls exhibits means for maintaining communication between the U-shaped passage and said second outlet in a region located beneath the uppermost level of the connection between the two legs of the U-shaped passage. By means of this arrangement, complete blockage of the U-shaped passage is prevented when the flow of suspension passing therethrough is slight or when said flow ceases completely. When the flow of suspension is subsequently increased, particles which have settled in the bottom portion of the U-shaped passage will be caused to swirl and accompany substantially only that part of the suspension which departs through the U-shaped passage and over said second weir, whereby the connecting region between the two legs of U-shaped passage will be completely cleansed and reopened. Thus, the sampling device is self-cleaning.
The means for maintaining communication between the U-shaped passage and the second outlet may, for example, comprise holes or slots in one or more of the partition walls, although a more favourable arrangement from the aspect of accuracy is obtained by causing the upper side of at least one of said partition walls to slope downwardly from the opposite ends of the partition wall, from locations above the uppermost level of the connection between the two legs of the U-shaped passage, to a position located at a distance beneath said uppermost level and at a distance from both ends of the partition wall. In practice it has been found most suitable to provide said upper side with a substantially symmetrical V-shape, the most favourable result with respect to correspondence of the sample-flow with the composition of the supplied suspension and the self-cleaning effect of the de
REFERENCES:
patent: 2670629 (1954-03-01), Belden
patent: 3999438 (1976-12-01), Sundvist
Boliden Aktiebolag
Swisher S. Clement
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