Cleaning and liquid contact with solids – Apparatus – With plural means for supplying or applying different fluids...
Patent
1990-10-11
1992-04-28
Stinson, Frankie L.
Cleaning and liquid contact with solids
Apparatus
With plural means for supplying or applying different fluids...
134111, 134166C, 134169C, 134184, B08B 304
Patent
active
051078759
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an apparatus for flushing hydraulic pipe systems or the like.
Hydraulic and other similar pipe systems must be cleaned internally from contaminating particles remaining after the installation before they are taken into use, said particles otherwise causing serious disruptions later on.
In accordance with the commonly adopted apprehension among those skilled in the art, achieving a satisfactory flushing result requires that the flushing is carried out with so high a flow volume that a turbulent flow is produced, i.e. one must attain a Reynolds's Number of approximately 4000.
In the so called normal hydraulics, by which one understands pipe systems of a relatively small extension and medium-size pipe diameters, up to about 50 mm, flow volumes of approximately 300 to 400 liters per minute are required. Hydraulic aggregates are in fact available, but they are sizeable and expensive, which involves unreasonably high costs in flushing the hydraulic systems, especially since the flushing is a so called one-time operation.
For this reason, one has mostly confined oneself to performing the flushing with smaller hydraulic aggregates normally available on the site, said aggregates having a flow volume of about 100 to 150 liters per minute, whereby one does not achieve a turbulent flow but only a laminar flow whose cleaning effect is nearly non-existent, or else one has simply refrained from carrying out any flushing. The result has been that serious disruptions in operation have subsequently developed.
The object of the present invention is to provide a novel apparatus permitting effective cleaning of hydraulic and other similar pipe systems of so called normal size, utilizing hydraulic aggregates already present on the site.
The apparatus of the invention is mainly characterized in that a bipartite cylinder structure is connected between the pipe system and the hydraulic aggregate known per se, said cylinder structure comprising a piston shaft common to both parts of the cylinder structure, and having a piston in each part for providing four cylinder chambers, of which two chambers have a smaller cross-section than the two other chambers,
that the two cylinder chambers having a smaller cross-section are arranged to be alternately connected to the outlet of the hydraulic aggregate, whereby in each case the smaller cylinder chamber which is not connected to the hydraulic aggregate and one of the larger cylinder chambers are connected to the inlet of the pipe system whilst the other one of the larger cylinder chambers is connected to the outlet of the pipe system through a filter, and
that immediately downstream from the filter a branch line is provided, preferably under a certain back pressure, to convey part of the flushing fluid back into the hydraulic aggregate.
The cylinder, including the filter, comprised by the invention can advantageously be constructed as a single unit, termed flushing unit in the following. Only this flushing unit needs to be transported to and from the pipe system to be flushed clean. The flushing unit is small and inexpensive and its use requires no special professional skill. Neither is one dependent on the supply of electric current, and the invention is therefore well suited to the flushing of e.g. excavating machinery or the like located outdoors in a terrain that is difficult of access, and in that case the hydraulic aggregates of the machinery can be used.
E.g. a hydraulic trunk line of a papermaking machine or the trunk line for the cargo pumps on a tank vessel or other similar systems having a number of branch loops, each of which constitutes a hydraulic pipe system as contemplated in the present application, can also serve as the hydraulic aggregate. The loops in question can be flushed clean also during the normal operation of the main system by connecting in each case a flushing unit between the trunk line and the branch loop.
On account of the fact that part of the flushing flow is constantly recycled to the reservoir of the hydraulic aggregate,
REFERENCES:
patent: 918091 (1909-04-01), Roche
patent: 2028972 (1936-01-01), Fessler
patent: 2204900 (1940-06-01), Lowry
patent: 3182670 (1965-05-01), Howell
patent: 4874002 (1989-10-01), Sundholm
patent: 4991610 (1991-02-01), Huber et al.
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