MOVABLE HYDRODYNAMIC NOZZLE FOR PRESSURIZED WATER CLEANING OF WATER, DISCHARGE AND SURFACE WATER PIPES

Abstract: A movable hydrodynamic nozzle (31), which removes deposits of sand, soil, sludge etc. in a pipe system. The nozzle (31) is connected to a pressurized water pipe and pulls the pressurized water pipe into the pipe system. When known movable hydrodynamic nozzles are used, the cleaning efficiency is lower due to strong turbulence and frothing caused thereby and to the fact that the resistance of the nozzle, caused thereby, to the water flow is large. In accordance with the present invention this problem is solved by shaping the channels (33), which guide the pressurized water from the inlet portion (32) of the nozzle (31) to the outer back portion of the nozzle, in such a way that the pressurized water is entering the channels (33) in the same direction as it has when it enters the inlet portion (32). The inlet openings (A1, B1, C1 and D1) and oulet openings (A2, B2, C2 and D2 respectively) of every channel (33) are preferably diametrically opposed in order to give the channel an optimally large curve radius.

Description: Movable hydrodynamic nozzle for pressurized water cleaning of water, discharge and surface water pipes The present invention relates to a nozzle for hydrodynamic cleaning of pipe systems, particularily discharge and sur- face water pipe * systems. Deposits of sand, soil, sludge etc must be removed, at regular intervals, from a water pipe system in order to prevent insanitary 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 are pointed backwards an from which water,due to pumping pressure, is sprayed against deposit's in the pipe, .dissolves this material and.moves it backwards in order to be able to pump it from an well or the like. The nozzle pulls its pressurized water feeding pipe through- the water pipe, while working its way in the •water pipe, thanks to .the pressurized water jets pointed backwards, and freeing deposits at the same time and making this material flow, backwards in the pipe. In fig. 1 is shown, mainly diagrammatically, a longitudinal section in an axial direction of a known nozzle 1 for hydro- dynamic cleaning. When nozzle 1 is used, it is connected to a pressurized water pipe (now shown) , in which the pressure is generated by a pumping car engine or the like and which said car is able to bring forward increasingly, when the movable nozzle, which is attached to the pressure pipe, in¬ creasingly forces its way into the water pipe. The pressu- ' .rized water flows into the coaxially disposed opening 2 of nozzle 1 and is forced to pass (5) channels 3 in nozzle 1. Nozzle 1 is normally provided with from 6 to 8 such chan¬ nels 3 and nozzles (not "shown) are usually provided in the discharge openings of channels 3. The nozzle certainly works, but 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 strongly ob¬ structed and the efficiency of the pipe cleaning is poor. In fig. 2 is shown, also 'mainly diagrammatically, a more re¬ cent known embodiment of a movable hydrodynamic nozzle 21 , . by means of which the severest turbulence problems and froth¬ ing problems caused have- been overcome. Pressurized water 24 from a pumping car engine (not shown) flows through the feeding portion22 * a in the nozzle and reaches' a chamber 22 b in the nozzle. A flow separation device or guide 26 and the upper portion of feeding tube 27 cause the pressu¬ rized " water to circulate in chamber 22 b and it comparative- ly easy enters the feeding openings of channels 23 in cham¬ ber 22 b and .comes out of channels 23. The pressurized flow through the movable hydrodynamic nozzle, designed in this manner, is anily doubled,provided the rest of the parame-- 'ters are constant, and the cleaning efficiency is improved correspondingly. Applicant has now found, quite surprisingly and in accor¬ dance with the present invention, that the movable nozzle in fig. 2, designed to hydrodynamically clean pipe sys- terns, can be further developed and shaped resulting in the mainly complete disappearance of turbulence and frothing in. the nozzle caused by the same. The important distinguish¬ ing feature of the present invention is that the feeding 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 ob¬ liquely 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 5 water into the channels is obstructed surprisingly little. Thus, the overall pressurized water flow through the nozz¬ le is facilitated and the ratio between the pumping force and the cleaning efficiency is very satisfactory. 10 In a first preferred embodiment of the present invention means are provided, in the feeding opening of the nozzle, which additionally facilitates the admission of the pres¬ surized water in the channels, e.g. cup shaped surfaces around the feeding openings of the channels and/or an co- 15 axially disposed flow separator or guide, preferably shaped as a cone with its top in the upstream directioa. In a ° nother'preferred embodiment of the present ' invention the distance between the inlet opening and the outlet ope- 20 ning of each channel is as large as it is possible to make it, considering the outer chape of the nozzle and the di¬ rection and the position of the outlet opening' in order to maximize the curve radius of the channel and lower the re¬ sistance to the pressurized water flow through the nozzle. 25 In a third embodiment of the present invention is the out¬ let opening of each channel provided with a set of exchange¬ able nozzles having outlet openings having different diame¬ ters. ' 30 The present invention will be described more in detail in the following text, reference being made to the enclosed drawings: 35 Fig. 3 a and 3 b are mainly diagrammatically bottom views of a movable hydrodynamic nozzle according to the present invention. The nozzle is viewed in the directi n of the pressurized water flow,' and Fig. 4 is a mainly diagramma * tical longitudinal section in an axial direction. Fig. 3 a shows an embodiment of the movable hydrodynamic nozzle according to the -present invention. Nozzle 31 is shown in "an" axial direction and in the downstream direc¬ tion. Pressurized water, which enters the inlet opening 32 of the nozzle ' , hits the cup and quadrant shaped surfa¬ ces A,C,B -and D at the inner end of inlet opening 32 and is guided by these surfaces into inlet openings A.. , C- , B_. and D. respectively of the four channels 33 in nozzle 31. The pressurized water proceeds in said four cha nel-s and is discharged from outlet openings A~, C~, B 2 and D- •respectively of channels 33. Outlet opening A 2 and inlet A j are diametrically opposed; outlet opening C 2 and inlet' opening C. are diametrically opposed etc. and thus, the curve radius of channels 33 from A., to K~ , ' from C. to C 2 - etc in-nozzle 31 is maximized and the overall resistance to the pressurized water flow in the nozzle is low. Also, that is why,the pumping pressure in the pressurized " water feeding pipe being constant, the cleaning efficiency is high. This increase is surprisingly large. The ' efficiency is twice as high as the efficiency of the known nozzle according to fig. 2. and roughly four times as high as the efficiency of the known nozzle according to fig. 1. Fig. 3 b shows a preferred embodiment of the present in¬ vention , which is similar to the embodiment shown in fig. 3 a, but it is provided with an axially disposed pressurized water flow divider 39, which is mainly conically shaped and the top of which is disposed in an upstream direction. The flow divider 39 is, according to a particular embodi¬ ment of the present invention, combined with cup shaped pressurized water flow directing surfaces A,C,B and D around inlet openings A.. , C→ , B- and D_. respectively of channels 33. Fig. 4 is a longitudinal section of the nozzle according to fig. 3 a, an axial plane through two diametrically opposed channels 33. Pressurized water 34 flows into in¬ let opening 32 of nozzle 31 towards cup shaped surfaces- A arid B, in the form of partial flows 35 into inlet ope- , hings A→ and B.. respectively of channels 33 and out of out- let openings A 2 and B 2 respectively of said channels. Channels 33 suitably are made of metal pipe and nozzle 31 • of a plastic material , which surrounds the channels. One of several channels 37 having a downstream direction and. a comparatively small inner diameter are also shown in the figure. The cleaning work may be facilitated, if pressu¬ rized ' water jets 38 having a downstream direction start the dissolving of deposits of sand, soil, sludge etc, in the water pipe, which maybe is completely cloggedv One small nozzle 36 is shown in outlet opening A 2 .

Claims: CLAIMS 1. A movable hydrodynamic nozzle (31) for pressurized water cleaning of water, discharge and day water pipes, said nozzle (31) having a pressurized water inlet opening. (32) as well as one or more pairs of channels (33) having inlet openings in said inlet opening and outlet opening in the outer surface of said nozzle, said channels, trans¬ mitting the pressurized water out of said nozzle oblique¬ ly backwards in relation to the direction of the pressu- rized water, which it has, when it flows into said inlet •opening of the nozzle, c h a r a c t e r i z e d in that the channels (33) have a curvature, that the pressu¬ rized water (34) , when it enters said channels (33) from said inlet opening (32) , has the same direction as when it enters said inlet" opening, (32) but is defelcted in * _. -said channels (33) having a large curve radius * and that the. pressurized water, when it comes out .of (35) said channels (33) , besides the desired cleaning capacity also has the desired capacity * to propel the nozzle (31), the overall re.sistence of the nozzle to the pressurized water flow being low and. the cleaning efficiency,- that is the ratio between the cleaning capacity and the pumping force on the pressurized water, being high. 2. The nozzle according to claim 1, c h a r a c t e r i z e d in that the inner wall of said inlet opening (32) is pro¬ vided with cup shaped surfaces (A,C,B and D) around said inlet openings (A 1 , C 1 , B_ j and D 1 ) of said channels (33) and/or a coaxially disposed pressurized water flow divider or guide (39) , e.g. conically shaped with its top in an up¬ stream direction, in order to additionally facilitate the entering of the pressurized water in said channels (33) and lessen the overall resistence of said nozzle (31) to the pressurized water flow (34,35). 3. The nozzle according to claim 1 or 2, c h a r a c ¬ t e r i z e d in that the inlet openings (A.. , C→ , B. and D_ j ) and the outlet openings (A 2 , C 2 , B 2 and D 2 re¬ spectively) are diametrically opposed in the nozzle (31) in order to make the curve radius of said channels (33) as large as it is optimally possible as regards the direc¬ tions of said outlets and -their positions in the outer surface of .the nozzle' (31).

Inventors: LARSSON BO, LARSSON, BO
Applicants: LARSSON BO, LARSSON, BO
Application year: 1985
Main classification: B08B9
IPC codes: B08B9