EP0382086B1 - Device comprising a spraying chamber for spraying surfaces - Google Patents

Description

The invention relates to a device according to the preamble of claim 1.

When removing used layers of paint from house and ship walls, industrial buildings, etc., the used paint residues including rust and plaster particles must be collected to prevent them from penetrating into the groundwater, the sewage system or the harbor basin.

A device of this type is known (DE-PS 32 29 720), or the like for cleaning the surfaces of ship hulls, lock gates provided with an underwater paint. is used, and in which the discharge channel opens into a cyclone or into a cleaning unit consisting of several cyclones, from which or from which the pre-cleaned water is led into a water tank provided with several settling tanks. The dirt particles drawn off from the lower reaches of the cyclone or cyclones go into a collecting container. The wastewater cycle required for this is complex and takes up a lot of space, especially since it takes time to settle the paint particles, which is why all the wastewater must first be collected. The settled sludge is difficult to handle and therefore difficult to remove.

The invention is based on the object of designing a device of the type mentioned at the outset so that the separation of the color particles and the other solids contaminating the wash water from the wash water and the disposal of the color particles and the other solids can be carried out with little technical effort and in a space-saving manner .

This object is achieved by the characterizing features of claim 1. Because the dirt can now be caught relatively close to the spray housing, it is no longer necessary to lay the previously relatively long lines to the cyclones or to subject them to periodic cleaning themselves. The effort for separating the contaminants is considerably reduced and the relatively large sedimentation basin is eliminated. The advantages thus arise not only on the investment side, but also in the operation of the device, the contaminants being able to be disposed of simply and quickly by depositing or burning the filter and the washing water can be reused if necessary.

In an embodiment according to claim 2, the liquid with impurities is more effectively conveyed into the collecting filter by the pump, which now acts as a pressure pump and is arranged in the housing. The height adjustment enables the spray effect to be regulated. The collecting filter is expediently designed according to claim 3 for easier disposal, although it would be entirely possible within the scope of the invention to use, for example, disk-shaped filter membranes in a filter housing. Filters have the effect that over time they become clogged with contaminants. These impurities will be low if the device according to the invention - as is also provided - is used, for example, to apply coatings, for example lacquers, to the surface to be sprayed, but the main area of application is in cleaning the surface, which naturally results in a large amount of such impurities. Therefore, in order to extend the service life of the collecting filter, the design according to claim 4 is advantageously made. It has been shown that when coarse and fine impurities are caught in a single filter, the fine particles clog the spaces between the coarse particles and thus result in a synergistic effect, albeit in a negative sense. One separates against it Coarse and fine parts separately or one after the other, so there is enough space in the coarse filter between the coarse impurities to allow liquid and fine impurities to pass through, which are then caught in the fine filter and do not clog it so quickly because of their smaller amount.

For rapid disposal, it is advantageous to provide the measures according to claim 5, because then the standing times can be kept relatively short. Numerous versions of quick-release fasteners are known on the market, and their selection and training can be left to the expert.

The fact that now only cleaned liquid emerges behind the filter, generally washing water, can also reduce the water consumption or liquid consumption by the measures according to claim 6, which ultimately also relieves the environment.

Fig. 1

eine erfindungsgemässe Vorrichtung im Grundriss;

Fig. 2

einen Schnitt nach der Linie II-II der Fig. 1;

Fig. 2a

einen Schnitt durch eine andere Ausführungsform;

Fig. 2b

einen Detailschnitt der Fig.2a;

Fig. 3

eine Ansicht in Richtung des Pfeiles III in Fig. 1, wobei ein Längsholm geschnitten ist;

Fig. 4

den Bereich IV in Fig. 3;

Fig. 5

eine konstruktive Einzelheit im Vertikalschnitt;

Fig. 6

eine mit zwei Schaufelrädern und zwei Düsenkränzen ausgerüstete Vorrichtung im Grundriss;

Fig. 7

eine Ansicht in Richtung des Pfeiles VII in Fig. 6; und

Fig. 8

eine Ansicht in Richtung des Pfeiles VIII in Fig. 6.

Further details emerge from the following description of exemplary embodiments shown schematically in the drawing. Show it:

Fig. 1

a device according to the invention in plan;

Fig. 2

a section along the line II-II of Fig. 1;

Fig. 2a

a section through another embodiment;

Fig. 2b

a detail section of Figure 2a;

Fig. 3

a view in the direction of arrow III in Figure 1, wherein a longitudinal spar is cut.

Fig. 4

area IV in Fig. 3;

Fig. 5

a constructive detail in vertical section;

Fig. 6

a device equipped with two paddle wheels and two nozzle rings in the plan;

Fig. 7

a view in the direction of arrow VII in Fig. 6; and

Fig. 8

a view in the direction of arrow VIII in Fig. 6.

The device shown in FIGS. 1 to 4 for cleaning surfaces 0 provided with a paint coat (FIG. 2) has a nozzle ring 2 consisting of four spray nozzles arranged at an angular distance of 90 °, which is rotatably mounted about an axis of rotation 3. Pressed water is fed to the spray nozzles through cranked pipes 4. The spray nozzles are directed obliquely downward in such a way that when the spray water emerges, a force component is created which forces the nozzle ring 2 to rotate about the axis of rotation 3.

The pipes 4 open into the interior of a hub 6, to which the press water is fed.

Two pipes 4 are connected to each other by a stiffening strut 7. On the hub 6 and on the stiffening struts 7, blades 8 of a blade wheel are fastened, in which the blades 8 are arranged at an angular distance of 90 °. The blades 8 of the paddle wheel are inclined at an angle to the direction of rotation.

In the exemplary embodiment shown, the nozzle ring 2 and the paddle wheel form a structural unit which is arranged in a housing 9 in a height-adjustable manner.

2a, the blades 8 are driven via an internally toothed gear transmission 54, the details of which can be seen in section in FIG. 2b. The blade rotor 8 is separated from the nozzle ring 2 in this variant and is operated at a higher speed by a gear ratio. The rotation of the nozzle ring 2 is transmitted via a first pot 55 connected to it in a rotationally rigid manner with an internal toothing to a first gear 56 which is connected to a second gear 57 in a rotationally rigid manner. The second gear 57 is connected in a rotationally rigid manner to a shaft 65 and meshes with a second internal gear 66 of a second pot 67, which is rotatably mounted concentrically on the first pot 55 is. The shaft 65 is rotatably supported in a bearing cage 68 which is rigidly connected to the housing 9. The press water supply to the nozzle ring 2 takes place as in the device according to FIG. 2. The second pot 67 carries the blades 8 on its outside 69.

Instead of the gear transmission 54, a separate motor could also be used for the impeller.

The housing 9 has an upper floor 10 and a lower floor 11. The underbody is provided with a circular opening from which a cylindrical annular chamber 13 extends outwards. This annular chamber delimits the lower opening 14 of the housing. In operation of the device, the spray nozzles 1 rotate in the annular chamber 13 about the axis of rotation 3. The central axis 15 of the annular chamber coincides with the axis of rotation 3 of the impeller and the nozzle ring.

A brush seal (18, 19 in FIG. 4) is arranged on the free edge of the edge web 16 of the annular chamber 13 and is supported on the surface 17 to be cleaned during operation of the device.

The structural design of the brush seal results from FIG. In the exemplary embodiment, two concentric brush seals 18, 19 arranged at a radial distance are provided. Fastening legs 20 are connected to the edge web 16 by screws. These fastening legs are parts of profile rings which have a U-shaped anchoring groove 21, in each of which a brush seal is fixed.

The paddle wheel is arranged in the space of the housing 9 above the underbody 11. In the area between the sub-floor 11 and the top floor 10, as can be seen from FIG. 1, the housing 9 is of spiral design and forms one Discharge channel 22 for the contaminated wash water. This washing water is pressed into the discharge channel 22 by the blades 8. Here, the paddle wheel acts as a brake for the nozzle ring, which works on the principle of Segner's water wheel.

The discharge channel 22 merges into a nozzle 23, at the opening edge of which a collecting bag 24 is fixed for the color particles and other solids contained in the wash water. This grass-catcher is made of a water-permeable material. In the illustrated embodiment, a filter bag 25 is also attached to the opening edge of the nozzle 23, which surrounds the collecting bag 24. This filter bag has a small pore size or small mesh sizes, so that the filtered water escaping to the outside can be used again to operate the cleaning device and can be fed back to the spray nozzles as press water.

A quick-release fastener is expediently provided for releasably attaching the filter 24, 25, which, for example, engages a bead or flange 57 (FIG. 3) in the manner shown, which can be attached, for example, directly to the edges of the filter bags 24, 25. Each of the filters 24, 25 advantageously has its own such bead 57.

A hook 58 of a quick-release lever 60 articulated on an axle 59 can be placed on this bead. The axis 59 is seated on a short lever 61 which can be rotated in a manner known per se about a fixed bearing 62 and thus locks itself when the dead center is exceeded. Although only one lever 60 is shown, several of them can be distributed over the circumference of the nozzle 23. In any case, the bead 57 can be pulled through the hook 58 against a sealing flange 63 provided on the connecting piece 23.

Of course, a separate filtering of coarse and fine parts could also be solved in another way, for example by connecting a more or less short pipeline to the fine filter 25 following a housing accommodating the coarse filter 24, but it is understood that the stacked arrangement of coarse shown - And fine filter 24 or 25 is structurally more compact.

According to FIG. 1, the filtered wash water is collected by a funnel 26, which is expediently arranged underneath, and fed into a return line which conducts a line 27 starting from the funnel 26 to a process water tank 72 and from there a pump line 70 for high-pressure, e.g. from 1000 to 3000 bar, the press nozzles 1 supplied press water. High-pressure pump 71 is provided in line 70.

From the hub 6 of the assembly consisting of the nozzle ring 2 and the impeller 8 forming a pump rotor, a piece of pipe 28 extends, which is connected to a hollow cylinder 29. The pipe section 28 (or the hollow cylinder 29) extends into a sleeve 30 (FIG. 5) fixed to the upper floor 10, is supported there in a self-aligning bearing 31 and is enclosed at the lower end of the sleeve by an O-ring 31a which is in a annular recess 32 of a sleeve-fixed abutment ring 33 is mounted. The sleeve 30 is vertically adjustable in a flange ring 34 and can be locked in place by means of screws 35. The flange ring 34 is fastened to the upper floor 10 by screws 36, not shown.

The undercarriage of the device has two longitudinal spars 37, 38 which are cranked downward, the central part 39 of which runs at the height of the annular chamber 13. On the central part of the longitudinal spar 37 extending tabs 40 are attached perpendicular to the central part, on which a U-shaped bracket 41 is fixed is, whose side legs are connected to the housing 9, for example by welding. On the central part of the longitudinal spar 38, vertically extending tabs 42 are fastened, on which angle pieces 43, 44 are fixed, which are connected to the housing 9 at their free end edges.

The longitudinal bars 37, 38 are made of tubes. At the ends of the longitudinal spars, angle pieces 45 are provided, the vertical limbs 46 of which are fastened to the longitudinal spars and the horizontal limbs 47 carry castors 48.

In the exemplary embodiment, the outer boundary surface of the upper floor of the housing 9 is aligned with the outer boundary surface of the horizontal leg 47 of the angle pieces 45.

6 to 8 show an embodiment of the device, in which two structural units are arranged in a housing 9 ', each of which consists of a nozzle ring and a paddle wheel. These units are mounted around axes of rotation 49, 50 running parallel to one another. A discharge channel 51, 52 is assigned to each assembly. The discharge channels 51, 52 open into a nozzle 53, on which the collecting bag 24 is placed.

The structure of the chassis in the embodiment according to FIGS. 6 to 8 corresponds to the construction of the device according to FIGS. 1 to 5.

Numerous modifications are possible within the scope of the invention as claimed; For example, if there is a high proportion of fine impurities, it may be appropriate to connect two or more in series instead of just one fine filter 25 to be provided, the pores becoming smaller from filter stage to filter stage. Otherwise, it will be expedient if the blades of the pump rotor 8 are set at an acute angle in the direction of rotation.

Claims (10)

1. Apparatus for spraying surfaces, having at least one drivable spray nozzle through which pressurised liquid is passed and which is mounted so that it is rotatable about an axis of rotation, in a spray housing (9) having a spiral part which has at least one discharge channel for the pressurised liquid, which channel leads to a connection and is under pressure from a paddle wheel (8) mounted coaxially with the spray nozzle, the connection (23, 53) being connected to the spiral part, characterised in that a retaining filter (24) which retains the impurities present in the pressurised liquid and is made of a liquid-permeable material is fastened to the connection (23, 53).
2. Apparatus according to Claim 1, characterised in that at least only the pump rotor of the paddle wheel (8) delivering into the filter (24, 25), but in particular the entire assembly formed from this and the spray nozzle (1), is adjustable in height and lockable.
3. Apparatus according to Claim 1 or 2, characterised in that the retaining filter (24, 25) is in the form of a bag and(or a collecting funnel (26) is provided downstream of the retaining filter (24, 25) or underneath the latter.
4. Apparatus according to any of the preceding Claims, characterised in that the retaining filter (24, 25) has a coarse filter (24) and at least one downstream fine filter (25), a fine filter bag (25) preferably being placed on top of a coarse filter bag (24), for example of jute.
5. Apparatus according to any of the preceding Claims, characterized in that the fastening means for the retaining filter (24, 25) made of water-permeable material is a fast-action closure (58-63).
6. Apparatus acccording to any of the preceding Claims, characterized in that a return line (27, 72, 70) is laid from the retaining filter (24, 25), via which line the liquid purified by the retaining filter can be fed again to a pump (71) for generating the pressure or to the spray nozzle (1).
7. Apparatus according to any of preceding Claims, characterized in that the housing (9) has an upper base (10) covering the upper side and, opposite this, a lower base (11) having an opening for passage of the spray nozzle (1) or of the liquid, the spray nozzle (1) expediently projecting into an annular chamber (13) which is located opposite the surface (0) to be sprayed and is connected to the lower base (11) whose central axis coincides with the axis of rotation (3) of the spray nozzle (1), and that preferably the pump rotor (8) delivering into the filter (24, 25) is arranged in the housing space above the annular chamber (13) and above the lower base (11), the blades (8) of the pump rotor expediently being at an acute angle in the direction of rotation.
8. Apparatus according to any of Claims 2 to 7, characterized in that a hollow cylinder (29) which carries the pump rotor (8) or carries the assembly is located in a sleeve (30) mounted on the upper base (10), one of the cylindrical parts being adjustable in height and being capable of being fixed by means of screws, and in particular the hollow cylinder (29) being flexibly mounted at one end, in particular at the bottom, in a seal, for example in an O ring (31a) and at the other end, in particular the top, in a pendulum bearing (31).
9. Apparatus according to Claim 8, characterized in that the connections (27) together with the retaining filter (24, 25) can be moved on a mobile stand (37, 38, 48) which is provided with two longitudinal bars (37, 38) which are at the height of the annular chamber (13) and are detachably connected to the spray housing (9), and that angular pieces (45), the vertical limbs (46) of which are fastened to the longitudinal bars (37, 38) are expediently provided at the ends of longitudinal bars (37, 38), whereas their horizontal limbs (47) carry castors (48), the outer limiting surface of the upper base (10) of the spray housing (9) being flush with the outer limiting surface of the horizontal limb (47) of the angular pieces (45).
10. Apparatus according to any of the preceding Claims, characterized in that at least two spray nozzles, each rotating about an axis of rotation, are provided in a common housing (9') having a common retaining filter (24, 25).

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