Cleaning and liquid contact with solids – Apparatus – For work having hollows or passages
Patent
1986-07-25
1988-07-12
Coe, Philip R.
Cleaning and liquid contact with solids
Apparatus
For work having hollows or passages
1510412, 239DIG13, B08B 904
Patent
active
047563249
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a nozzle for hydrodynamic cleaning of pipe systems, particularly discharge and surface water pipe systems. Deposits of sand, soil, sludge etc must be removed, at regular intervals, from a water pipe system in order to prevent unsanitary conditions and the clogging of the pipes. The hydrodynamic nozzle according to the present invention is characterized, like nozzles in this technical field, by openings, which point backwards and from which water, due to pumping pressure, is sprayed against deposits in the pipe, dissolving this material and moving it backwards in order to be able to pump it from a well or the like. The nozzle pulls its pressurized water feed pipe through the water pipe, while working its way along the water pipe, due to the pressurized water jets pointed backwards, and freeing deposits at the same time and making this material flow backwards in the pipe.
FIGS. 1 and 1A show, diagrammatically, a longitudinal section in an axial direction of a known nozzle 1 for hydrodynamic cleaning. When nozzle 1 is used, it is connected to a pressurized water pipe (not shown), in which the pressure is generated by a pumping car engine or the like and which said car is able to advance, as the movable nozzle, which is attached to the pressure pipe, increasingly forces its way along the water pipe. The pressurized water flows into the coaxially disposed opening 2 of nozzle 1 and is forced to pass through channels 3 in nozzle 1. Nozzle 1 is normally provided with from 6 to 8 such channels 3 and nozzles (not shown) are usually provided in the discharge openings of channels 3. Though the nozzle works, its design leads to waste of pumping power, when it is used for cleaning of this kind. Pressurized water flow 4 in feeding opening 2 partly shuts off partial flows 5, which are forced to pass channels 3. A heavy turbulence with frothing results in feeding opening 2 and thus, the pressurized water flow through nozzle 1 is greatly obstructed and the efficiency of the pipe cleaning is poor.
FIGS. 2 and 2A show diagrammatically, a more recent known embodiment of a movable hydrodynamic nozzle 21, by means of which the severest turbulence problems and frothing problems caused have been overcome. Pressurized water 24 from a pumping car engine (not shown) flows through the feeding portion 22a in the nozzle and reaches a chamber 22b in the nozzle. A flow separation device or guide 26 and the upper portion of feeding tube 27 cause the pressurized water to circulate in chamber 22b and to comparatively easily enter the feeding openings of channels 23 in chamber 22b and come out of channels 23. The pressurized flow through the movable hydrodynamic nozzle, designed in this maner, is substantially doubled, provided the rest of the parameters are constant, and the cleaning efficiency is improved correspndingly.
Applicant has now found, quite surprisingly and in accordance with the present invention, that the movable nozzle in FIG. 2, designed to hydrodynamically clean pipe systems, can be further developed and shaped resulting in the almost complete disappearance of turbulence and frothing in the nozzle caused by the same. The important distinguishing feature of the present invention is that the feed opening of each channel in the nozzle is situated in that inner wall of the feeding opening in the nozzle, which is perpendicularly disposed in relation to the direction of the pressurized water flow. Thus, when pressurized water is forcing its way into each of said channels, the water has the same direction as the water in the feeding opening, but the channels are curved to the extent that, when the pressurized water comes out of the channels, it flows obliquely backwards in relation to the nozzle as is known in the art. In this way hardly any turbulence and frothing in the nozzle appears and the feeding of the pressurized water into the channels is obstructed surprisingly little. Thus, the overall pressurized water flow through the nozzle is facilitated and the ratio between the pumping force and the
REFERENCES:
patent: 1587194 (1926-06-01), Sladden
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