DE10230620C1 - Centrifugal cleaning method for soiled liquid from cleaning machine has solid particles in soiled liquid deposited on inside of rotating hollow body with overflow of cleaned liquid - Google Patents

Abstract

The method has the soiled liquid (S) supplied continuously or intermittently to the interior of a rotationally symmetrical hollow body (1) which rotates at high speed, with a rotating liquid layer (FR) obtained between a soiled liquid feed (3) and an overflow (2), extending above the overflow level. The solid particles (T) within the soiled liquid are deposited on the inside of the hollow body, with the cleaned liquid obtained from the overflow, its rotational energy converted into pressure, e.g. for operating a pump. An Independent claim for a device for centrifugal cleaning of soiled liquid from a cleaning machine is also included.

Description

The invention relates to a method for cleaning and conveying of cleaning processes, such as scrubbing and / or high pressure cleaning and / or wet suction Dirty water fleets, based on the centrifugal principle.

The invention further relates to a device for cleaning and conveying in cleaning processes, for example by Scrubbing and / or high pressure cleaning and / or wet cleaning with mobile or stationary cleaning machines Dirty water fleets.

Known floor cleaning machines consist of rotating Brush the surfaces to be cleaned with a Scrubbing detergent, and from a wet vacuum cleaner that with its suction base the detergent-dirt mixture soaked up and in a vacuum Dirty water tank collects.

Such floor cleaning machines have one Fresh water tank, the capacity of which the working time of the Machine limited. This causes the  Cleaning work must be interrupted because of Fresh water supply is used up. The dirty water from the Waste water tank is disposed of and new fresh water in the Fresh water tank filled.

These disadvantages tried the floor cleaning machine of the company COMAC (see brochure from the company. COMAC SPA, "floor cleaning machines" 4/93) or mobile wet cleaning machine according to DE 42 00 064 C2 or DE 41 41 711 C2 or a cleaning device for flat surfaces in accordance with DE 93 01 169 U1 should be avoided by providing filters that filter out the dirt particles when the water passes from the dirty water tank to the fresh water tank. However, since the filter does not have an unlimited service life and becomes clogged with dirt particles during use, the filter must be cleaned or replaced at certain intervals.

The consumption of filters is accordingly high and expensive, on the other hand, removing the filter leads to cleaning again to interrupt the cleaning process.

It is furthermore from DE 40 38 954 C2 a method for Removal of a on a cylindrical wall rotating centrifuge solids, in particular from the centrifuge from a liquid-solid mixture sedimented solids, known. This known priority Centrifuge used in the metalworking industry has a drum with mutually parallel end walls and a jacket wall, which consists of a cylindrical part and there is a conically narrowing part. The sedimented solids become a solid Exit opening by sweeping the entire Metal inner wall by means of a  Transport device, for example a screw, transported away to block the centrifuge avoid. Snail and drum have a common Drive, with corresponding gear coupling, such as Spindle, planetary gear, gears etc. between the drum and snail are necessary to make a relative movement between To allow drum and snail, Furthermore, are Baffles and built-in elements are present, which can be removed of the entering liquid-solid mixture in the direction Should prevent discharge opening. All of these characteristics result the well-known centrifuge that is very massive, heavy and therefore not suitable for use in automatic cleaning machines is.

A device is also known from DE 100 32 782 C1 for cleaning in cleaning machines, for example Scrubber-drier, resulting waste water fleets Filtering with a sand filter known when filtering is flowed through by the dirty water fleet and at Backwash against the filtering direction by an air Water mixture is circulated.

With this well-known filtering method, the consumption reduced filter material, but the separation process remains time-consuming, which means that the cleaning or Area performance of the machines is limited.

In this prior art, the object of the invention based on the separation speed of the solids from the Liquid in the cleaning process by using the centrifugal sedimentation instead of filter separation to increase the area coverage of the cleaning process  Simplification of the construction of the centrifuge by eliminating Transport facilities while reducing their Weight, ease of use and low cost too increase.

This task is accomplished by a method and an apparatus with the characterizing features of claims 1 and 14 solved.

Advantageous embodiments of the method and Device are the corresponding subclaims removable.

The advantage of the solution according to the invention is above all in that the separation process of the solid particles from the Liquid due to the usual high centrifugation Centrifugal forces that are up to a thousand times the Gravitational acceleration g, is accelerated significantly. The method according to the invention is characterized in that the separation process was carried out with very small amounts of water can be and the residence times achieved are small. A Circular operation is possible without problems.

The device according to the invention is inexpensive, simple under construction and can be easily integrated into existing ones Integrate floor cleaning machines.

Further advantages and details emerge from the following description with reference to the attached drawings.

The invention is intended to several Embodiments are explained in more detail.  

It shows:

Fig. 1 is a schematic flow diagram of the method of the invention,

Fig. 2 is a longitudinal section of the device according to the invention,

Fig. 3 is a section along the line AA of Fig. 2 and 5,

Fig. 4 shows a detail X at the overflow shown in FIG. 1

Fig. 5 shows a variant of the device according to the invention with the pump chamber,

Fig. 6 is an illustration of a static pump guide.

The inventive method and the inventive The device should not use the example of an application Floor cleaning machine shown are shown.

Fig. 1 shows the sequence of the method according to the invention with a known amount of inflow Z to wastewater liquor S during rotation of the rotationally symmetrical hollow body 1 about its axis of symmetry BB after a residence time t. As a result of the density differences between the solid particles T contained in the dirty water liquor and the liquid F, the particles T separate out on the inside 24 of the solid shell M of the rotating hollow body 1 . The liquid F freed from the solid particles rises to the height H of the overflow 2 , forms a cleaned liquid layer FR and is held up to the overflow level by the centrifugal forces on the inside 24 of the full jacket M. Solid particles T and the cleaned liquid F rotate at the speed of the hollow body 1 . Through the feed line 3 , dirty water liquor S continues to flow in with the inflow quantity Z. Then, applies to the amount of overflow Ü of purified liquid that the inflow amount Z to wastewater liquor in the inflow time t ₁ equal to the amount of overflow Ü of purified liquid at the time t must be ₁ + .DELTA.t, where .DELTA.t the running time of a liquid particles over the length L of the hollow cylinder 1 , The overflow amount Ü of cleaned liquid is less than the rotating liquid layer FR. At time t ₁ + Δt, the overflow quantity Ü rotates at the angular velocity ω = 2πf and experiences a tangential acceleration with which the overflow quantity Ü leaves the overflow 2 . The kinetic energy inherent in the overflow quantity Ü is sufficient to automatically derive the overflow quantity Ü of cleaned liquid.

example 1

Fig. 2 shows the device according to the invention in the vertical installation position during the deposition process in longitudinal section. The device consists of a static basic housing 4 , which is formed from side walls 5 , a bottom 6 and a cover 7 . The basic housing 4 is divided into two chambers 9 and 10 by a partition 8 , the upper chamber 9 being sealed liquid-tight by the partition 8 . The lower chamber 10 receives a drive 11 and possibly a pump 12 attached to the bottom 6 . The drive 11 , for example a high-speed motor, is flanged to the outside of the partition 8 . The drive shaft with coupling 14 of the drive 11 lies on the vertical axis of symmetry BB of the basic housing 4 .

The partition 8 is concavely drawn inwards and therefore has an outward slope that opens into an outflow pipe 13 leading to the outside.

In the upper chamber 9 there is the rotationally symmetrical, drum-shaped hollow body 1 , which is connected in a rotationally fixed manner to the drive shaft of the drive 11 via the coupling 14 . The hollow body 1 consists of a base 15 and a cylindrical solid jacket M rising from the base 15 , which carries at its upper edge an overflow edge 16 which projects vertically into the interior of the hollow body 1 . The axis of symmetry of the hollow body 1 lies on the axis BB. A bearing 17 is arranged centrally in the base 15 and is rotatably supported on the drive shaft. The overflow edge 16 can be designed to be adjustable, which is indicated by the dashed lines in FIG. 2.

The bottom 15 of the hollow body 1 carries a distributor disk 18 with guide elements 19 which is connected to the hollow body 1 in a rotationally fixed manner and thus also rotates about the axis of symmetry BB. A coarse trap screen 21 can be attached directly to the edge 20 of the distributor disk 18 to ensure that no large or coarse particles lead to blockages in the separation area.

A feed pipe 22 for the dirty water liquor is guided into the hollow body 1 to above the distributor disk 18 centrally through the cover hood 7 along the axis of symmetry BB through the opening opened by the overflow edge 16 . The inlet pipe 22 is fastened to the cover 7 and carries a coarse dirt collecting chamber 23 which is arranged approximately in the lower third of the hollow body 1 above the distributor disk 18 .

In the inside of the bowl 24 M are of the hollow body 1, as Fig. 3 shows, the chamber segments 25 and solids chambers 26 incorporated, is limited so that the proper motion of the dirty water in the thickness direction of the deposited solids. Corresponding catch elements 27 , such as catch fleece, filter bag and / or filter bag, can be attached to the inside 24 of the full casing M.

Fig. 4 shows a possibility of the adjustability of the overflow rim 16 by means of a lip seal 28 attached to the overflow rim 16 , whereby the lip seal allows more liquid to drain due to the higher water pressure if the liquid supply is too large. The overflow quantity Ü can thus be better adapted to the inflow quantity.

The dirty water liquor S is passed through the inlet pipe 22 into the rotating hollow body 1 . Via the outlet of the inlet pipe 22 , the dirty water liquor S pre-cleaned from the coarse dirt reaches the rotating distribution disk 18 with guide elements 19 or the floor 15 . The contaminated feed quantity Z of the dirty water fleet is accelerated by the guide elements 19 , pressed in the direction of the inside 24 of the rotating solid jacket M of the hollow body 1 and carried along by the chamber segments 25 or the filter elements 27 and kept in rotation. The speed of the drive 11 is, for example, 5000 1 / s. Due to the different masses of solid particles T and the water F, the solid particles T are pressed to the inside 24 of the solid shell M of the hollow body 1 , collected as a solid cake or collected in the easily removable catch elements 27 . Due to the constant and / or internal separation of solid particles T, a liquid layer FR is formed on the solid jacket M of the hollow body 1 in accordance with the set height H of the overflow rim 16 . The thickness of the liquid layer FR then determines the resulting degree of cleaning. The quantity Z of the dirty water liquor S which continues to flow in requires a further increase in the thickness of the liquid layer FR, as a result of which an overflow quantity Ü exceeds the overflow edge 16 . The kinetic energy of the overflow quantity U is sufficient to automatically discharge the overflow quantity U into the outlet connection 13 via the intermediate space 29 formed by the side wall 5 and the outer lateral surface of the hollow body 1 . It is also possible to separate the purified water as pressurized water by interposing a pump 12 .

The volume held on the inside of the full jacket Liquid layer FR is dimensioned so that a sufficient residence time t for the separation of the Solid particles T is guaranteed.

Due to the very small overflow quantity U in relation to the quantity of the liquid layer FR, only a thin surface layer of cleaned liquid reaches the outlet connection 13 .

If the deposited layer has grown so much that cleaning of the incoming dirty water fleet is no longer possible, the inflow of dirty water fleet is interrupted, the catch elements are removed and rinsing liquid is fed into the hollow body 1 .

The rinsing process changes with changing speed  performed to remove the dirt chambers from the filter cake to free. After backwashing, the Separation process to be continued.

Example 2

FIG. 5 shows the device according to the invention also in a vertical position with an integrated pump chamber. Of course, it is also possible to implement a horizontal installation position without departing from the invention. The housing structure basically corresponds to that of Example 1, so that the reference numerals used are retained. Only the partition 8 is flat, has no drain connector 13 and the separate pump 12 is omitted. The arrangement and position of the drive 11 corresponds to that of Example 1.

In the upper chamber 9 there is the rotationally symmetrical hollow body 1 , in which an intermediate space 30 is formed above the base 15 by an intermediate segment 31 fastened to the inside 24 of the full casing M. Overflow openings 32 are introduced into the intermediate segment 31 and lead into the intermediate space 30 . In the intermediate space 30 , a static pump guide body 33 is used, which has a plurality of driver elements 34 and guide chambers 35 , which have a narrowing flow cross section. The guide chambers 35 lead centrally into a drain pipe 36 located on the axis of symmetry BB, which is guided through the cover 7 to the outside. The overflow U on cleaned liquid F is thereby divided into a plurality of radial partial flows TR, the speed of which increases correspondingly when flowing through the guide chambers 35 . The rigid drain pipe 36 connected to the pump guide body 33 is supported by a bearing 37 arranged centrally on the intermediate segment 31 .

The inlet pipe 22 for the dirty water liquor S is guided coaxially to the axis of symmetry BB in the upper region of the hollow body 1 and its outlet is directed perpendicularly to the inside 24 of the solid jacket M. Alternatively, it is also possible to attach a distributor plate 39 to the upper edge 38, which rises vertically from the solid jacket M, and to direct the outlet opening of the inlet pipe 22 onto the distributor plate 39 . The distributor plate 39 rotates with the hollow body 1 and directs the escaping dirty water fleet S in the direction of the inside 24 of the full jacket M.

Chamber segments 25 and dirt chambers 26 are incorporated into the inside 24 of the full casing, as in Example 1. The separation process of the solid particles T proceeds as in example 1. The liquid freed from the solid particles T moves in the direction of the intermediate segment 31 and passes through the overflow openings 32 into the intermediate space 30 . The overflowed cleaned liquid is kept in rotation by the driver elements 34 . As the amount of liquid increases, the cleaned liquid moved with high rotational energy is conducted into the guide chambers 35 of the static pump guide body 33 and discharged as a pressure liquid through the drain pipe 36 .

LIST OF REFERENCE NUMBERS

BB axis of symmetry
D thickness of the liquid layer
F liquid
FR Cleaned liquid layer
H overflow height
M full coat
S dirty water fleet
TR partial flows
t dwell time
t1 closing time
t1 + Δt overflow time
T solid particles
Ü Overflow quantity
Z inflow quantity

1

hollow body

2

overflow

3

supply

4

Static basic housing

5

Side wall

6

ground

7

cover

8th

partition wall

9

Upper chamber

10

Lower chamber

11

drive

12

pump

13

drain connection

14

clutch

15

ground

16

Overflow edge

17

camp

18

distribution disc

19

baffles

20

Edge of

18

21

Grobfangsieb

22

supply pipe

23

Coarse dirt-collecting chamber

24

Inside of the full jacket M

25

chamber segment

26

Solid chamber

27

filter elements

28

lip seal

29

Outer space

30

Space (pump chamber)

31

intermediate segment

32

Overflow opening

33

Pumpenleitkörper

34

Driver elements from

33

35

guide chambers

36

drain pipe

37

camp

38

Upper rising edge

39

distribution table

Claims (34)

1.Procedure for cleaning and conveying dirty water liquors resulting from cleaning processes, for example scouring and / or high-pressure cleaning and / or wet vacuuming, according to the centrifugal principle, in which the incoming liquid laden with solids continuously or intermittently in a rapidly rotating, rotationally symmetrical hollow body ( 1 ), distributed on the inside ( 24 ), set in rotation with it and kept constantly as a rotating liquid layer between an inlet ( 3 ) and an overflow ( 2 ) slightly above the overflow level, during which the solid particles on the inside ( 24 ) of the hollow cylinder ( 1 ) are separated and collected, when the overflow level is exceeded, a correspondingly small overflow quantity of rotating, cleaned liquid is discharged and the kinetic energy (rotational energy) is converted into pressure. 2. The method according to claim 1, characterized in that the incoming liquid is subjected to a static coarse filtering before introduction into the hollow body ( 1 ) or before distribution in the hollow body ( 1 ). 3. The method according to claim 1 or 2, characterized in that the rotation of the hollow body ( 1 ) is generated by a drive. 4. The method according to any one of claims 1 to 3, characterized in that the generated pressure to derive and / or to operate a Pump is used. 5. The method according to any one of claims 1 to 3, characterized in that the generated pressure depending on the overflow amount, the Speed of the drive, and the inflow amount is adjustable. 6. The method according to claim 5, characterized characterized that the overflow quantity (Ü) of cleaned liquid is adjustable. 7. The method according to any one of claims 1 to 6, characterized in that the overflow amount of purified liquid divided into a plurality of radial partial flows (TR), increases the flow rate in each partial flow by narrowing the cross-section, then by increasing all partial flows an increase in the pressure of P _U <P _{L is} generated. 8. The method according to claim 7, characterized featured that to split the rotating subset in a variety of radial Partial flows (TR) uses a static pump guide becomes. 9. The method according to any one of claims 1 to 8, characterized in that at Distribute the liquid contaminated with solids Inlet directed directly onto the inside of the hollow body is used.   10. The method according to any one of claims 1 to 8, characterized in that at Distribute the liquid contaminated with solids Distribution plate is used. 11. The method according to any one of claims 1 to 10, characterized in that the Own movement of the separated solids on the inner Shell surface limited by segments in the thickness direction becomes. 12. The method according to any one of claims 1 to 11, characterized in that the Solids when separated by catch elements on the inside Lateral surface to be collected. 13. The method according to any one of claims 1 to 12, characterized in that at Removal of the separated solids from the hollow body Flushing liquid in the rotating body below simultaneous change in the speed of the hollow body initiated and deducted. 14.Device for cleaning and conveying in cleaning processes, for example by scrubbing and / or high-pressure cleaning and / or wet vacuuming with mobile or stationary cleaning machines, dirty water liquors, with the method according to claim 1, characterized in that a rapidly rotating, rotationally symmetrical hollow body ( 1 ) is provided, in the extended axis of symmetry (BB) of which a drive ( 11 ) for rotating the hollow body is arranged, and that at least one inlet pipe ( 22 ) for introducing the liquid and an outlet pipe ( 36 ) into the hollow body ( 1 ) and that the hollow body ( 1 ) is provided with an overflow edge ( 16 ) which rises vertically from its inside ( 24 ) or an edge with an overflow opening ( 32 ) for forming a liquid layer (FR) close to the jacket surface during its rotation, the overflow edge ( 16 ) or the overflow opening ( 32 ) opposite the inlet pipe ( 22 ) is arranged. 15. The apparatus according to claim 14, characterized in that the inlet pipe ( 22 ) for the dirty water fleet extends with its outlet opening close to the bottom ( 15 ) of the hollow body ( 1 ) and is arranged in its axis of symmetry (BB). 16. The apparatus according to claim 14 or 15, characterized in that the outlet opening is assigned a rigidly fixed to the bottom ( 15 ) of the hollow body ( 19 ), with the hollow body rotating distributor disk ( 18 ) with guide elements ( 19 ) for distributing and deflecting the incoming dirty water fleet is. 17. The apparatus according to claim 14 or 15, characterized in that the bottom ( 15 ) itself is designed as a distributor disc and carries the guide elements ( 19 ). 18. Device according to one of claims 14 to 16, characterized in that a coarse dirt collecting chamber ( 23 ) is provided which is centered around the axis of symmetry (BB), approximately in the lower region of the hollow body ( 1 ) on the inlet pipe ( 23 ). 19. Device according to one of claims 14 to 18, characterized in that the overflow edge ( 16 ) has an adjustable height (H) depending on the solids content in the liquid and on the residence time. 20. The apparatus according to claim 19, characterized in that a lip seal ( 28 ) is attached to the overflow edge ( 16 ). 21. Device according to one of claims 14 to 20, characterized in that the hollow body ( 1 ) in a liquid-tight housing ( 4 ) with a space along the outer jacket (M) of the hollow body along ( 29 ) for the discharge of the cleaned amount of liquid in one Drain pipe ( 13 ) is arranged. 22. The apparatus according to claim 21, characterized in that the bottom ( 6 ) of the housing ( 4 ) for concurrent drainage of the cleaned liquid is formed. 23. The device according to claim 22, characterized in that the drive ( 11 ) on the bottom ( 6 ) of the housing ( 4 ) is attached. 24. Device according to one of claims 14 to 23, characterized in that the housing ( 4 ) with a cover ( 7 ) is closed in a liquid-tight manner, the inlet pipe ( 22 ) being guided centrally through the cover. 25. Device according to one of claims 21 to 24, characterized in that a separate pump ( 12 ) for generating pressurized water from purified liquid is additionally provided. 26. The device according to claim 14, characterized in that the inlet pipe ( 22 ) for the dirty water fleet is arranged coaxially to the axis of symmetry (BB) of the hollow body ( 1 ) and with its open end substantially perpendicular to near the inside ( 24 ) of the full casing ( M) of the hollow body ( 1 ) is guided. 27. The device according to claim 14, characterized in that a separate pump chamber ( 30 ) is provided in the hollow body ( 1 ), which is formed by an intermediate segment ( 31 ) arranged opposite the bottom ( 15 ) of the hollow body ( 1 ). 28. The device according to claim 26 and 27, characterized in that a static pump guide body ( 33 ) with flow channels (TR) leading centrally into the drain pipe ( 36 ) is arranged in the pump chamber ( 30 ). 29. The device according to claim 28, characterized in that the drain pipe ( 36 ) is arranged in the axis of symmetry (BB) of the hollow body ( 1 ) and is connected to the pump guide body ( 33 ). 30. The device according to claim 29, characterized in that within the pump chamber ( 30 ) on the inside ( 24 ) of the full casing (M) of the rotating hollow body ( 1 ) scoop-like driver elements ( 34 ) are provided, which are assigned to the flow channels (TR) , 31. The device according to claim 28, characterized in that the flow channels (TR) have a cross section narrowing towards the drain pipe ( 36 ). 32. Device according to claim 30, characterized in that the intermediate segment ( 31 ) has overflow openings ( 32 ). 33. Device according to claim 14, characterized in that on the inside ( 24 ) of the full casing (M) of the hollow body ( 1 ) catch elements ( 27 ), for example filters, filter bags, filter bags or dirt-catching fleeces, are fastened. 34. Device according to claim 33, characterized in that the inside ( 24 ) of the full casing (M) is divided by chamber segments ( 25 ) projecting vertically from the full casing into dirt chambers ( 26 ) to limit the intrinsic movement of the uncleaned liquid.