Cleaning and liquid contact with solids – Processes – Hollow work – internal surface treatment
Patent
1993-03-25
1995-01-24
Dean, Richard O.
Cleaning and liquid contact with solids
Processes
Hollow work, internal surface treatment
134 2212, 134 2218, 134 24, 134 34, 134167C, 134172, 134179, 15304, 15394, 15405, B08B 900, B08B 902, B08B 904, B08B 502
Patent
active
053839757
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an arrangement for cleaning of pipe lines, and especially ventilation pipes and ventilation ducts of large cross-sectional area in buildings, and comprises a cleaning means which is connected to a source of pressure medium, for example a compressed air compressor via a supply conduit, and which exhibits one or more nozzle openings which are directed backwards towards the supply conduit at an acute angle relative to a centre line which extends through the fastening of the supply conduit in the cleaning means.
BACKGROUND OF THE INVENTION
The object of the present invention is to provide an arrangement according to the preamble, and which produce a satisfactory cleaning of pipe lines of loose dust, deposits and other contaminants plus disinfection of the lines also. The invention primarily aims to provide cleaning of ventilation pipes and ventilation ducts, but being able to clean of contaminants all types of conduits.
SUMMARY OF THE INVENTION
These objectives are achieved with the present invention which is characterized in that a cleaning means in the arrangement shows a nozzle opening in the form of a largely continuous annular gap which extends along the outermost periphery of the cleaning means and which is connected to the supply conduit and the source of pressure medium via one or more ducts which are arranged within the cleaning means, and where the medium is made to flow out through the annular gap and partly clean inner walls of the conduit, partly by way of forces of reaction from the outflowing medium make the cleaning means moving into the pipe line. The remaining characterizing features of the invention will be evident from the patent claims.
On cleaning of a pipe line a coupling arrangement is arranged on an inspection opening, exhaust valve or the like, and which seals against the opening in the pipe line. A cleaning means according to the invention which is arranged in the one end of a flexible hose, is introduced through an insertion opening in the coupling arrangement and into the pipe line. The coupling arrangement is coupled by means of a conduit to a vacuum cleaner arrangement or the like, which is utilised to establish a reduced pressure in the pipe line. A pressure medium, for example compressed air or steam is fed to the cleaning means, which by forces of reaction from the outflowing medium brings the cleaning means to move into the pipe line thereby causes the cleaning means to move into the pipe line and convey with it the supply conduit for the pressure medium, so that as a consequence of the high speed of discharge, the outflowing medium loosens dust, deposits and other contaminants on inner wall of the pipe line. The dust or the deposits are thereafter sucked out by means of the vacuum cleaner arrangement.
It has been found practical to conduct the cleaning in several steps, the first step consisting in making the cleaning means to move through the pipe line during feeding of a solvent. In this step the primary objective is not to loosen dust and detach deposits in the pipe line by means of the mechanical finishing ability of the air, but to feed a cleaning agent which contributes to the solubility of the deposits. The second step consists in making the cleaning means to move through the pipe line under full pressure of the pressure medium, the speed of the cleaning means being regulated by braking the introduction of the supply conduit in the pipe line. The dust and the deposits are consequently released by means of the cutting action which is produced by the medium which discharges from the annular gap on the cleaning means, but also as a consequence of the irregular movements of the cleaning means and impacts against inner walls of the pipe line. The cleaning means also can be made to move in a rotating movement by twisting of the supply conduit cyclically a number of rotations first in one direction and thereafter in an equal number of turns in the opposite direction during the course of cleaning. When the cleanin
REFERENCES:
patent: 4841999 (1989-06-01), Danko
patent: 5003998 (1991-04-01), Collett
patent: 5143105 (1992-09-01), Katayama
Dean Richard O.
El-Arini Zeinab
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