Cleaning and liquid contact with solids – Processes – Hollow work – internal surface treatment
Patent
1992-09-01
1994-03-22
Breneman, R. Bruce
Cleaning and liquid contact with solids
Processes
Hollow work, internal surface treatment
134 2212, 134167C, 134172, 134179, B08B 900, B08B 902, B08B 904, B08B 502
Patent
active
052960382
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a process for cleaning of pipe lines, especially ventilation pipes and ventilation ducts of large cross-sectional area, in buildings, by means of a cleaning means, which is connected via a supply conduit to a source of pressure medium, for example a compressed air compressor, and which cleaning means 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. The present invention is also relates to a nozzle opening in the form of a mainly continuous annular gap, which extends along the periphery of the cleaning means and which is connected to the supply conduit and the source of pressure medium, the medium being made to discharge through the annular gap and partly clean inner walls of the line, and partly, by way of forces of reaction from the discharging medium, make the cleaning means move into the pipe line.
The invention also relates to a cleaning arrangement for carrying out the process, comprising a cleaning means in the form of a rear piece, and a front piece detachably mounted on the rear piece, for providing a nozzle opening in the form of a mainly continous annular gap which is directed backwards towards the supply conduit at an acute angle towards a centre line which extends through the fastening of a supply conduit in the cleaning means, and the cleaning means is connected to a source of pressure medium via the supply conduit.
Norwegian Patent No. 41.358. discloses a nozzle head for cleaning pipes and passageways. The nozzle head which comprises an annular continous gap near the periphery of the head, is connected to a hose supplying pressure fluid, and the fluid is directed backwards through the gap to clean the pipe and move the nozzle head further along the pipe. However, the nozzle head of this prior art is intended and designed also to rotate and to float about the middle of the pipe in effecting the cleaning operation. Thus it is not intended to be in close contact with the pipe inner wall as is the case with the present invention. Another example of this kind of cleaning nozzle head is known from U.S. Pat. No. 1,587,194.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a process and an arrangement, 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 of large cross-sectional surface, but being able to clean of contaminants all types of conduits having dissimilar cross-sectional forms also lies within the scope of the invention.
These objectives are achieved with the process of the present invention which is characterised in that the cleaning means is brought into contact with an inner wall of the line in that a reduced pressure is established between the cleaning means and the inner wall and that the cleaning means is made to move around about the cross-section of the line by twisting the supply conduit about its longitudinal axis. This reduced pressure is preferably established by bringing the annular gap on the cleaning means into close contact with inner wall of the line and especially by adjusting the cleaning means to assume an angle against inner wall of the line.
The cleaning arrangement of the present invention is characterised in that the cleaning means has largely the shape of a ball wherein the continuous gap extends along the outermost periphery of the cleaning means, said continous gap is established by the back piece exhibiting an external conical surface extending along its periphery at its forward end, while the front piece presenting a conical internal surface corresponding to said back piece conical surface in order to, when used, establishing said annular gap and said annular gap being directed back out towards the coupling means at an angle of up to 3
REFERENCES:
patent: 1587194 (1926-06-01), Sladden
patent: 4500492 (1985-02-01), Yamakawa
patent: 4841999 (1989-06-01), Danko
patent: 5003998 (1991-04-01), Collett
patent: 5143105 (1992-09-01), Katayama
Breneman R. Bruce
El-Arini Zeinab
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