Cleaning and liquid contact with solids – Apparatus – With plural means for supplying or applying different fluids...
Patent
1989-02-28
1991-04-16
Stinson, Frankie L.
Cleaning and liquid contact with solids
Apparatus
With plural means for supplying or applying different fluids...
134166C, 134168C, 134169C, B08B 310
Patent
active
050074440
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an apparatus for flushing hydraulic small-diameter pipe systems and the like or a part of such a pipe system, comprising a hydraulic pump means for flushing liquid through the pipe system, and filter means.
Hydraulic and other similar pipe systems ought to be cleaned internally, before the system is taken into use, to remove contaminating particles remaining after the manufacture and mounting, since these otherwise will later on cause serious disturbances during operation.
It is a generally accepted opinion among those skilled in the art that for achieving sufficiently good results the flushing has to be carried out with a flow volume sufficiently large to create a turbulent flow, i.e. it is necessary to obtain a value of about 4,000 on the Reynolds's scale.
With long small-diameter pipe systems, it has not previously been possible to achieve a sufficiently efficient flushing. Pipe systems for valve control hydraulics in a ship may be mentioned as an example. The length of the pipe system may well amount to about 200 m, the pipe diameter is about 10 mm, and oil with a viscosity of e.g. 37 cSt is used as a flushing liquid. In order to achieve a turbulent flow during the flushing, i.e. a value of about 4,000 on the Reynolds's scale, a flow of about 70 litres per minute is required, whereby the pressure drop will be about 4 bar per metre and from one end of the pipe system to the other about 800 bar. The problem is that this kind of pipes simply do not withstand such high pressures.
If the flushing is carried out with a smaller volume flow so as to keep the pressure drop in compliance with the pressure resistance properties of the pipe system, a laminar flow with practically non-existing cleaning properties is achieved in place of a turbulent flow. For this reason, the flushing has in most cases been totally neglected, which has resulted in serious subsequent operational disturbances.
The object of the present invention is to provide a new apparatus which enables hydraulic and other similar small-diameter pipe systems to be flushed efficiently.
The apparatus according to the invention is mainly characterized in that means for feeding a pressurized gas into the flushing liquid are arranged in connection with the hydraulic pump means, and that the flushing circuit includes valve means arranged to at first be closed when the pipe system has been filed with flushing liquid and said pressurized gas, in order to compress the gas entrained in the pipe system, and thereafter to be opened for expanding the gas, in order to create a forceful flushing pulse through the pipe system.
In a preferred embodiment of the invention, the entire pipe system is at first filled with flushing liquid, preferably oil, whererafter gas and further oil are alternately introduced pulsewise into the pipe system, at least one liquid pressure accumulator being provided at the outlet end of the pipe system to receive a volume of oil corresponding to the introduced volume of said gas and further oil, respectively, and to therebetween be emptied into an oil receiver tank. When the pipe system has been substantially filled with alternating gas and oil columns, and compressed the pipe system is opened into the receiver tank, whereat a forceful flushing pulse through the pipe system, preferably in a direction opposite to the pulsewise filling.
The entrained gas is preferably nitrogen. The impurities flushed out are filtered off the flushing liquid in a filter aggregate preferably arranged in a return pump conduit between a collecting tank at the outlet end of pipe system and the tank of the hydraulic pump means. This is because the filter aggregate does not resist the forceful liquid pulses.
In the following the invention will be described in more detail with reference to the attached drawing, in which FIGS. 1 and 2 show schematically two embodiments in the form of coupling diagrams.
In FIG. 1, the pipe system to be cleaned is designated with the reference numeral 1. The numeral 2 designates a pump means for the fl
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