EP3179112B1 - Pump cover plate with through holes that are designed as inertial filters - Google Patents
Pump cover plate with through holes that are designed as inertial filters Download PDFInfo
- Publication number
- EP3179112B1 EP3179112B1 EP17152843.3A EP17152843A EP3179112B1 EP 3179112 B1 EP3179112 B1 EP 3179112B1 EP 17152843 A EP17152843 A EP 17152843A EP 3179112 B1 EP3179112 B1 EP 3179112B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- centrifugal wheel
- screw
- type centrifugal
- cover plate
- pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000012530 fluid Substances 0.000 claims description 13
- 239000007787 solid Substances 0.000 description 14
- 239000000356 contaminant Substances 0.000 description 8
- 239000012535 impurity Substances 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 5
- 238000011109 contamination Methods 0.000 description 5
- 238000005266 casting Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- -1 for example faeces Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 210000003608 fece Anatomy 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
- F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C2/16—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
- F04D29/708—Suction grids; Strainers; Dust separation; Cleaning specially for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2250/00—Geometry
- F05D2250/10—Two-dimensional
- F05D2250/15—Two-dimensional spiral
Definitions
- the invention relates to a screw centrifugal pump with a cover plate.
- the document CH 662 864 discloses a screw centrifugal wheel pump, the screw centrifugal wheel being rotatably mounted on an axis of rotation.
- the screw centrifugal wheel pump has a cavity in the area of the connection between the screw centrifugal wheel and the axis of rotation.
- This embodiment of a screw centrifugal wheel pump which is very proven per se, has the disadvantage that contaminants can accumulate and accumulate inside the cavity. This results in increased wear and / or increased maintenance.
- the screw centrifugal wheel pump according to the invention has the advantage that a partial flow is formed during the pumping operation, which flows from the front to the rear of the cover plate and then flows again along a center opening of the cover plate to the front of the cover plate, so that a cleaning flow is formed which is able to Any contaminants located or deposited in the cavity behind the cover plate must at least partially be conveyed back to the front of the cover plate, so that these contaminants can be conveyed away via the main flow of the screw centrifugal wheel pump.
- the screw centrifugal wheel pump comprises a rotatably mounted screw centrifugal wheel and a cover plate arranged directly next to the screw centrifugal wheel with a central opening, a hub or a drive shaft of the screw centrifugal wheel preferably running through the central opening.
- a fluid-conducting gap is formed between the center opening and the hub or the drive shaft.
- the cover plate runs on the side facing the screw centrifugal wheel or on the partial surface facing the screw centrifugal wheel, preferably in accordance with the course of the rear of the screw centrifugal wheel, so that the partial surface preferably runs in the shape of a truncated cone or even, wherein the partial surface could also have a different course shape, for example a curved or polygonal course.
- a front side of the cover plate comprises in particular a partial surface, the course of which is designed to match the rear side of the screw centrifugal wheel such that a gap of up to 3 mm is formed between the front side of the cover plate and the rear side of the screw centrifugal wheel.
- the gap preferably has a width in the range from 0.5 mm to 2 mm.
- the screw centrifugal wheel has a direction of rotation.
- the partial surface preferably has a spiral-shaped depression, which essentially runs outwards along the partial surface, starting in the region of the central opening.
- the spiral-shaped depression advantageously runs in the direction of rotation from the inside to the outside.
- the opening advantageously runs counter to the direction of rotation of the screw centrifugal wheel.
- An entry surface formed by an entry opening of the opening preferably runs essentially parallel to the axis of rotation and facing away from Direction of rotation.
- the cover plate particularly preferably consists of a metal sheet.
- a screw centrifugal wheel pump comprising a pump housing with a pump inflow opening and a housing rear wall arranged opposite the pump inflow opening, comprising a screw centrifugal wheel rotatably arranged within the pump housing with a hub and a blade, and also comprising a rotatable drive shaft which is connected to the screw centrifugal wheel, and also comprises a cover plate which is arranged between the screw centrifugal impeller and the rear wall of the housing, the cover plate having a central opening through which the hub or the drive shaft runs, and an interior space being formed between the cover plate and the rear wall of the housing, the cover plate having a front side oriented towards the pump inflow opening, and wherein the front side comprises a partial surface, the course of which is designed to be adapted to the rear side of the screw centrifugal wheel such that between the front side a gap of up to 3 mm is formed between the cover plate and the rear of the screw centrifugal wheel, a gap being formed between the center opening of the cover plate and
- a method for self-cleaning a screw centrifugal wheel pump comprising a rotatably mounted screw centrifugal wheel and a cover plate with a central opening arranged to form a gap on the rear side of the screw centrifugal wheel, the cover plate having an opening which is spaced apart from the center opening, a hub or a
- the drive shaft of the screw centrifugal wheel runs through the center opening, so that a fluid-conducting gap is formed between the center opening and the hub or the drive shaft, the screw centrifugal wheel and the arrangement of the opening being mutually adapted such that the rear side of the screw centrifugal wheel has the opening during the rotation of the Screw centrifugal wheel is not covered or is only covered during a partial angle ⁇ , the screw centrifugal wheel being rotated in the direction of rotation and thereby releasing a fluid ang a main flow is promoted, a partial flow F1 of the fluid flows through the opening to the rear of the cover plate, and this partial flow then flows back over the columns to the
- a cover plate for a screw centrifugal wheel pump wherein the cover plate has a front side and a rear side, and wherein the cover plate has a center opening in the center thereof, the center opening being configured to pass through an axis of rotation of the screw centrifugal wheel and running in the direction of the axis of rotation, and wherein the cover plate has at least one opening which is spaced from the central opening, and wherein the opening has a fluid-conducting connection between the Forms front and rear of the cover plate, and wherein the opening has an inlet opening towards the front, and wherein the front has a recess, the inlet opening being arranged in this recess, and wherein the inlet opening forms an inlet surface that is substantially parallel to the axis of rotation A runs.
- a hub of the screw centrifugal wheel comprises a circular base part, that a blade of the screw centrifugal wheel is arranged on the circular base part, and that the circular base part is arranged concentrically to the axis of rotation and has a maximum radius, the maximum radius in this respect the opening is adapted so that the base part does not cover the opening.
- a hub of the screw centrifugal wheel comprises a crescent-shaped base part, that a blade of the screw centrifugal wheel is arranged on the crescent-shaped base part, and that the crescent-shaped base part has a maximum radius and a minimum radius with respect to the axis of rotation, the crescent-shaped base part with respect to The opening is designed in such a way that the base part does not cover the opening at the minimum radius and that the base part covers the opening when the screw centrifugal wheel rotates through 360 ° during a partial angle.
- FIG. 1 shows a known from the prior art in the document CH 662 864 disclosed embodiment of a screw centrifugal wheel pump.
- Figure 1 shows an axial section through the screw centrifugal wheel pump 1 comprising a screw centrifugal wheel 20 with a hub 21 and a blade 25, comprising a drive shaft 33 which is fixedly connected to the hub 21, and comprising a housing rear wall 23 arranged behind the screw centrifugal wheel 20, and one the screw centrifugal wheel 20
- an outlet opening 36 is provided in the housing rear wall 23 in the vicinity of the drive shaft 33 so that gases can escape which are carried in the conveying medium and which separate out against the impeller rotation center and through the gap on the impeller rear side between impeller hub 21 and housing rear wall 23 in reach the interior 37.
- the gap between the impeller hub 21 and the rear wall 23 of the housing is designed as a labyrinth, both the hub-side and the rear wall-side labyrinth structure being interrupted by a transverse groove 38, so that a self-cleaning effect is created and no co-conveyed solid parts into the interior 37 and the outlet opening 36 reach.
- Figure 1a shows a side view of the in Figure 1 Screw centrifugal wheel pump 1 shown with the outer housing 3 broken away.
- Figure 1b shows a top view Embodiment of a screw centrifugal wheel 20, which is not in the document CH 662864 is disclosed, which, however, for those in the Figures 1 and 1a Screw centrifugal pump 1 shown would be suitable, therefore the Figures 1, 1a and 1b be explained together.
- the screw centrifugal wheel 20 of the screw centrifugal wheel pump 1 comprises a hub 21 with a sickle-shaped base part 30, to which a blade 25 is connected, an axis 33 penetrating the pressure-side housing wall 23 designed as a truncated cone and being connected to the hub 21.
- the blade 25 also includes a suction-side flank 39.
- the crescent-shaped base part 30 extends from the blade outlet tip 35, into which the end edge 26 runs, in a sickle or spiral shape over a relatively large distance around the pump axis to a point 31 at which the Hub 21 has a relatively small radius R2.
- the hub 21 has the largest radius R1 at the blade outlet tip 35.
- a relatively large area of the housing wall 23 is exposed over a relatively large arc ⁇ , which is expediently approximately 120 °, between the blade outlet tip 35 and the aforementioned hub location 31.
- the exposure of the housing wall 23 by reducing the impeller hub radius R1 can go as far as the material-technical parameters allow in order to ensure that the screw centrifugal impeller 20 is sufficiently strong.
- FIG 2 shows a longitudinal section of an embodiment of a screw centrifugal wheel pump 1 according to the invention.
- the screw centrifugal wheel pump 1 comprises a pump housing 3 with inlet opening 3a or pump inflow opening 3a, outlet 3b and housing interior 3c, and further comprises a hub 21, which is connected to a blade 25, which is only shown schematically and in broken lines and thereby forms a vane centrifugal wheel 20, and which is rotatably supported by a drive shaft 33 rotatable about an axis A.
- the connection between the drive shaft 33 and the hub 21 is shown only schematically.
- the blade 25 and the hub 21 are preferably, as in Figure 1a and 1b shown, designed as a single, common part or as a vane centrifugal wheel 20.
- the screw centrifugal wheel pump 1 also includes a conical inner housing 4 with inlet opening 4a and a spacer ring 5.
- the screw centrifugal wheel pump 1 also includes a housing rear wall 23 with an outlet opening 36 and a seal 6.
- the outlet opening 36 is used for maintenance purposes and is during operation of the screw centrifugal wheel pump 1 usually closed with a plug from the outside.
- a main flow F is generated, which leads via the inlet opening 3a to the outlet 3b.
- the conveyed main stream F comprises a fluid, preferably water and possibly gases such as water vapor, the screw centrifugal wheel pump 1 being used in a preferred use for conveying contaminated water, so that the main stream F can also comprise solids, for example faeces, sand, gravel, textiles, Fibers, plastic parts etc.
- the screw centrifugal wheel pump 1 also comprises a cover plate 2, which is arranged in the direction of the axis A directly behind the hub 21 or the screw centrifugal wheel 20.
- the cover plate 2 has a front side 2h and a rear side 2i, the front side 2h comprising a partial surface 2k, the course of which is adapted to the rear side 25a of the screw centrifugal wheel 20 in such a way that between the front side 2h of the cover plate 2 and the rear side 25a of the screw centrifugal wheel 20 Gap 24 of a maximum of up to 3 mm is formed.
- the gap 24 preferably has a width in the range between 0.5 mm and 2 mm.
- the gap 24 is designed so narrow, among other things, that solids, for For example, tissues occurring in wastewater, such as women's stockings, cannot penetrate into the gap 24 or can even wrap around the hub.
- the narrow gap 24 also produces a shear effect on solids located within the gap 24, so that they are mechanically crushed and conveyed to the main stream F.
- at least one of the surfaces oriented toward the gap 24 is structured, rough or, for example, with teeth that protrude, in order to improve mechanical comminution of solids located in the gap 24.
- a gap 24 that would be wider than 3 mm, for example 5 mm or wider, would have several disadvantages. On the one hand, due to the wide gap 24, the mechanical comminution of solids would no longer be guaranteed.
- the front side 2h in the exemplary embodiment shown comprises an essentially frustoconical partial surface 2k, the shape of the rear side of which is adapted to a screw centrifugal wheel 20, the partial surface 2k having a central opening 2g in the center thereof, the central opening 2g running parallel in the direction of the axis A.
- the hub 21 runs through the central opening 2g, so that a gap 2b extending in the direction of the axis A is formed between the central opening 2g and the hub 21.
- the hub 21 also has a projection which partially covers the partial surface 2k, so that between the hub 21 and the partial surface 2k a gap 24 is formed which extends transversely with respect to the axis A in the exemplary embodiment shown.
- the cover plate 2 has at least one opening 2a, which is arranged at a distance from the central opening 2g, the opening 2a forming a fluid-conducting connection between the front 2h and the rear 2i of the cover plate 2.
- the fluid has a higher one in the area of the opening 2a Pressure on than in the area of the central opening 2g, whereby a partial flow F1 is generated in that a part of the main flow F flows as partial flow F1 through the opening 2a to the rear 2i of the cover plate 2 into the interior 37, and then via the gap 2b and the gap 24 flows back into the main stream F.
- This partial flow F1 has the effect that contaminations which are located in the interior 37 are conveyed out of this and are fed to the skin stream F.
- the screw centrifugal wheel 20 and the arrangement of the opening 2a are mutually adapted such that the rear side 25a of the screw centrifugal wheel 20 does not cover the opening 2a or only covers a partial angle ⁇ when the screw centrifugal wheel 20 rotates through 360 °.
- the screw centrifugal wheel 20 could be as in FIGS Figures 12 and 13 be designed shown.
- Figure 12 shows a pump housing 3 in which a cover plate 2 and a screw centrifugal wheel 20 are arranged.
- the hub 21 is connected to a circular base part 30, the blade 25 being connected to the base part 30 via its end edge 28.
- the screw centrifugal wheel 20 comprises an end edge 26, a pressure-side blade flank 27, a suction-side flank 39 and a blade outlet tip 35.
- Figure 13 shows the screw centrifugal wheel 20 in a top view, the base part 30 being circular and having a maximum radius R1 with respect to the axis A.
- Figure 13 shows an example of a possible arrangement of an opening or an opening 2a with respect to the screw centrifugal wheel 20.
- the opening 2a is not covered by the screw centrifugal wheel 20 or by the rear side 25a of the screw centrifugal wheel 20, so that the opening 2a is always open.
- We are in the area of the opening 2a advantageously generates a flow in the direction of rotation R of the screw centrifugal wheel 20 in order to make it more difficult or to prevent the entry of solid contaminants into the opening 2a.
- a fluid-conducting connection is formed between the front 2h and the interior 37 via the opening 2a in order to generate a fluid flow F1 which flows into the interior 37 via the opening 2a and flows out of the interior 37 again via the gap 2b.
- the screw centrifugal wheel 20 could be as in FIGS Figures 1a and 1b be designed shown.
- the hub 21 of the screw centrifugal wheel 20 comprises a sickle-shaped base part 30, the blade 25 being arranged on the sickle-shaped base part 30 and the sickle-shaped base part 30 having a maximum radius R1 and a minimum radius R2 with respect to the axis of rotation A.
- the crescent-shaped base part 30 is configured with respect to the opening 2a such that the rear side 25a of the screw centrifugal wheel 20 does not cover the opening 2a at the minimum radius R2, the rear side 25a of the screw centrifugal wheel 20 covering the opening 2a when the screw centrifugal wheel 20 rotates through 360 ° of a partial angle ⁇ covered.
- the opening 2a is thus briefly covered during each rotation of the screw centrifugal wheel 20.
- This embodiment has the advantage that a flow in the direction of rotation R of the screw centrifugal wheel 20 is advantageously generated in the area of the opening 2a in order to make it more difficult or to prevent solid impurities from entering the opening 2a.
- a further advantage can be seen in the fact that solid impurities that accumulate at the inlet opening of the opening 2a are mechanically removed by the hub 21, 30 moving over the opening 2a if the impurities protrude beyond the front side 2h.
- the drive shaft 33 could also be advanced further, so that the gap 2b is formed at least partially or also exclusively between the cover plate 2 and the drive shaft 33.
- the cover plate 2 has at least one opening 2a and preferably at least two openings 2a.
- the openings 2a in the partial surface 2k are advantageously arranged symmetrically with respect to the axis A.
- the openings 2a can be designed in a variety of ways. In the Figure 2 Opening 2a shown below is in Figure 3 shown enlarged.
- a flow F2 flows at the front 2h of the cover plate 2.
- the opening 2 comprises an entry opening 21, the cross section of which forms an entry surface 2m.
- the partial flow F1 flows through the opening 2a to the rear 2i of the cover plate 2.
- the partial flow F1 is deflected into the opening 2a as it flows in, which has the advantage that it is difficult for solids in the flow F2 to flow into the opening 2a.
- the partial flow F1 is thereby at least partially cleaned of solids, because the solids remain at least partially in the flow F2 and are carried away by it.
- the cover plate 2 could, similar to that in Figure 1a back wall shown, have a cone angle ⁇ in the range between 5 ° and 70 °.
- FIG. 4 shows a further embodiment of an opening 2a. Unlike the one in Figure 3 The embodiment shown is the one in Figure 4 The opening 2a shown is arranged so that the partial flow F1 is deflected with respect to the flow F2 occurring at the front 2h of the cover plate 2 such that it undergoes a partial flow reversal.
- the opening 2a runs as in FIG Figure 4 shown at least partially opposite to the direction of rotation R of the screw centrifugal wheel 20
- the opening 2a running through has the advantage that solids can reach the rear side 2i of the cover plate 2 less well through the opening 2a.
- Opening 2a shown above is in Figure 5 shown enlarged.
- a recess 2c is arranged on the front side 2h of the cover plate 2, which opens into the opening 2a, the opening 2a forming an inlet opening 21 with an entry surface 2m, so that the inlet opening 21 is arranged in the recess 2c.
- the entry opening 21 or the entry surface 2m can be arranged in a wide variety of ways, but advantageously as in FIG Figure 5 represented in such a way that the partial flow F1 is deflected and, with respect to the flow F2 occurring at the front 2h of the cover plate 2, is at least partially reversed.
- the inlet opening 21 arranged in this way has the advantage that solids can reach the rear side 2i of the cover plate 2 less well through the opening 2a.
- the entry surface 2 m is arranged such that it runs parallel or essentially parallel to the axis A. As in Figure 5 the entry surface 2m is preferably arranged facing away from the direction of rotation R. In Figure 5 is not the axis A per se, but the course direction of the axis A is shown. As in Figure 5 shown, the entry surface 2m is arranged in a further advantageous embodiment in such a way that it extends perpendicularly or substantially perpendicularly to the direction of rotation R of the drive shaft 33, the entry surface 2m being arranged facing away from the direction of rotation R.
- FIGS 6, 7 and 8th show an embodiment of a cover plate 2 in plan view, in perspective view and in a section along the section line BB.
- the recess 2c as in the Figures 6 and 7 represented, at least partially formed by a substantially perpendicular or perpendicular to the axis A bore.
- Figure 6 shows the course of the axis A and the preferred direction of rotation R. Aus Figure 6 it can thus be seen that the entrance surface 2m runs parallel to the axis A and perpendicular to the direction of rotation R.
- Figure 8 shows in section the cover plate 2 with front 2h, back 2i and center opening 2g.
- the openings 2a are arranged in the frustoconical or substantially frustoconical partial surface 2k, the openings 2a being always spaced apart from the central opening 2g.
- the openings 2a could also, as in Figure 3 shown, run perpendicular or substantially perpendicular with respect to the partial surface 2k, or as in Figure 4 shown, extend transversely with respect to the partial surface 2k.
- Screw centrifugal wheel 20 shown could, for example, the in Figure 6 with 2k designated partial area of the front 2h are covered, with the Figure 1a and 1b described way.
- Screw centrifugal wheel 20 shown could, for example, the in Figure 6 with 2k2 designated partial area of the front 2h are permanently covered.
- the cover plate 2 as in the Figures 6 to 8 shown, a recess extending in the circumferential direction, in particular a spiral recess 2d, which advantageously extends outwards in the region of the central opening 2g starting along the partial surface 2h.
- the recess 2d advantageously runs as in FIG Figure 6 shown in the direction of rotation R in a spiral from the inside to the outside.
- the hub 21 rotating over the partial surface 2k in the direction of rotation R or the screw centrifugal wheel 20 rotating in the direction of rotation R also helps the dirt located in the recess 2d or on the partial surface 2k to move in the direction of rotation R and to convey it towards the outside with respect to the partial surface 2k until the contamination reaches the skin stream F, and is captured and carried away by it.
- the cover plate 2 can, as in the Figures 7 and 8th shown, also have a recess 2f running along the edge region, which is provided in particular for receiving an O-ring and thus for sealing.
- Figure 9 shows in a section a further embodiment of a cover plate 2 which, in contrast to that in Figure 8 shown section, however, has a flat partial surface 2k or 2k2. Otherwise, the cover plate 2 is configured similarly to that in FIG Figure 8 illustrated embodiment, by the cover plate 2 according to Figure 9 also has a recess 2c which extends into an opening 2a flows out. Insofar as the spiral-shaped depression 2d is disregarded, the Figure 6 a top view of the in Figure 9 illustrated cover plate 2. The in Figure 9 However, the cover plate 2 shown could also have a spiral-shaped recess 2d, so that a top view of this embodiment as in FIG Figure 6 would look represented.
- Cover plate 2 shown also has a central opening 2g and a front 2h and a back 2i.
- the front side 2h or the partial surface 2k can run in a variety of ways, for example curved, as in FIG Figure 10 represented schematically in a section, or angular, as in Figure 1 1 represented schematically in a section.
- the partial surface is as in Figure 8 shown, frustoconical.
- the cover plate 2 is designed as a casting, the recess 2c and advantageously also the opening 2a or the inlet opening 21 already forming part of the still unprocessed casting. To complete the cover plate 2, it is then essentially still necessary to machine the front 2h, in particular by machining.
- a cover plate 2 made from such a cast piece has the advantage that there are no or only very small additional costs in the production, since the machining of the cover plate 2 is necessary anyway.
- the in the Figures 6 to 8 Cover plate 2 shown, comprising two recesses 2c with openings 2a, can thus be produced with negligibly small additional costs compared to cover plates 2 without openings 2a.
- the casting can have a thickness between 2 and 10 mm.
- the cover plate 2 could also be made from a metal sheet.
- Screw centrifugal wheel pump 1 has a rotatably mounted screw centrifugal wheel 20 as well as a cover plate 2 arranged directly next to or behind the screw centrifugal wheel 20 with a central opening 2g, a hub 21 of the screw centrifugal wheel 20 or an axis 33 supporting the screw centrifugal wheel 15 running through the central opening 2g, so that between the Center opening 2g and the hub 21 or the axis 33 forms a fluid-conducting gap 2b.
- a partial flow F1 of the fluid will flow through an opening 2a spaced with respect to the central opening 2g to the rear 2i of the cover plate 2 and this partial flow F1 thereafter via the Flow gap 2b back to the main flow F due to the pressure difference between the opening 2a and the gap 2b.
- This partial flow F1 promotes any contaminants located in the space behind the cover plate 2 back to the main flow F.
- the cover plate 2 has a spiral-shaped recess 2d on its front surface 2h on its partial surface 2k, the spiral-shaped recess 2d in the direction of rotation R from the inside runs outwards, so that the partial flow F1 emerging from the gap 2b and the impurities which may be present therein are fed to the main flow F via the spiral-shaped depression 2d.
- cover plate 2 and the rear wall 23 are always shown as separate parts.
- the cover plate 2 and the housing rear wall 23 could also be designed in one piece, for example in that they are made from a single part, for example a cast part.
- a single cast part comprising both the cover plate 2 and the housing rear wall 23 has the advantage that it can be produced inexpensively and that there is no seal between the cover plate 2 and the housing rear wall 23 more is needed. This enables a particularly low-maintenance embodiment.
- Figure 14 shows a plan view of a further embodiment of the already in Figure 6 Cover plate 2 shown.
- the opening 2a or the entry surface 2m again runs parallel to the axis A, the opening 2a or the entry surface 2m, in contrast to Figure 6 , with respect to a straight line L extending radially through the axis A, is inclined by an angle ⁇ , the angle ⁇ preferably having a value in the range of + / - 60 degrees.
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Description
Die Erfindung betrifft eine Schraubenzentrifugalradpumpe mit einer Deckplatte.The invention relates to a screw centrifugal pump with a cover plate.
Das Dokument
Des Weiteren offenbart das Dokument
Es ist Aufgabe der vorliegenden Erfindung eine Schraubenzentrifugalradpumpe auszubilden, die bezüglich der Anlagerung von Verunreinigungen vorteilhaftere Eigenschaften aufweist.It is an object of the present invention to form a screw centrifugal pump, which with respect to the Accumulation of impurities has more advantageous properties.
Diese Aufgabe wird gelöst mit einer Schraubenzentrifugalradpumpe aufweisend die Merkmale von Anspruch 1. Die Unteransprüche 2 bis 14 beziehen sich auf weitere, vorteilhafte Ausführungsformen.This object is achieved with a screw centrifugal wheel pump having the features of
Die erfindungsgemässe Schraubenzentrifugalradpumpe weist den Vorteil auf, dass sich während dem Pumpbetrieb ein Teilstrom ausbildet, der von der Vorderseite zur Rückseite der Deckplatte strömt und danach entlang einer Mittenöffnung der Deckplatte wieder zur Vorderseite der Deckplatte strömt, sodass sich ein Reinigungsstrom ausbildet, der in der Lage ist allfällig im Hohlraum hinter der Deckplatte befindliche oder angelagerte Verunreinigungen zumindest teilweise wieder zur Vorderseite der Deckplatte zu fördern, sodass diese Verunreinigungen über den Hauptstrom der Schraubenzentrifugalradpumpe weggefördert werden können.The screw centrifugal wheel pump according to the invention has the advantage that a partial flow is formed during the pumping operation, which flows from the front to the rear of the cover plate and then flows again along a center opening of the cover plate to the front of the cover plate, so that a cleaning flow is formed which is able to Any contaminants located or deposited in the cavity behind the cover plate must at least partially be conveyed back to the front of the cover plate, so that these contaminants can be conveyed away via the main flow of the screw centrifugal wheel pump.
Die erfindungsgemässe Schraubenzentrifugalradpumpe umfasst ein drehbar gelagertes Schraubenzentrifugalrad sowie eine unmittelbar neben dem Schraubenzentrifugalrad angeordnete Deckplatte mit einer Mittenöffnung, wobei eine Nabe oder eine Antriebswelle des Schraubenzentrifugalrades vorzugsweise durch die Mittenöffnung verläuft. Zwischen der Mittenöffnung und der Nabe beziehungsweise der Antriebswelle ist ein Fluid leitender Spalt ausgebildet. Das Rotieren des Schraubenzentrifugalrades in Drehrichtung bewirkt, dass ein Fluid entlang eines Hauptstromes gefördert wird, was zur Folge hat, dass ein Teilstrom des Fluides über eine bezüglich der Mittenöffnung beabstandete Durchbrechung zur Rückseite der Deckplatte strömt, und dass dieser Teilstrom danach über den Fluid leitenden Spalt wieder zum Hauptstrom strömt, auf Grund der zwischen der Durchbrechung und dem Fluid leitenden Spalt herrschenden Druckdifferenz. Dieser Teilstrom bildet ein reinigender Fluidstrom, der insbesondere den rückseitigen Raum der Deckplatte durchströmt und darin allfällig vorhandene Verunreinigungen dem Hauptstrom zuführt.The screw centrifugal wheel pump according to the invention comprises a rotatably mounted screw centrifugal wheel and a cover plate arranged directly next to the screw centrifugal wheel with a central opening, a hub or a drive shaft of the screw centrifugal wheel preferably running through the central opening. A fluid-conducting gap is formed between the center opening and the hub or the drive shaft. Rotating the screw centrifugal wheel in the direction of rotation causes a fluid to be conveyed along a main flow, with the result that a partial flow of the fluid flows through an opening spaced apart from the center opening to the rear of the cover plate, and this partial flow thereafter via the fluid-conducting gap again flows to the main flow due to the pressure difference between the opening and the fluid-conducting gap. This partial flow forms a cleaning fluid flow, which in particular flows through the rear space of the cover plate and feeds any impurities present therein to the main flow.
Die Deckplatte verläuft auf der dem Schraubenzentrifugalrad zugewandten Seite beziehungsweise der dem Schraubenzentrifugalrad zugewandten Teilfläche vorzugsweise entsprechend dem Verlauf der Rückseite des Schraubenzentrifugalrades, sodass die Teilfläche vorzugsweise kegelstumpfförmig oder eben verläuft, wobei die Teilfläche auch eine andere Verlaufsform aufweisen könnte, beispielsweise einen gekrümmten oder mehrkantigen Verlauf.The cover plate runs on the side facing the screw centrifugal wheel or on the partial surface facing the screw centrifugal wheel, preferably in accordance with the course of the rear of the screw centrifugal wheel, so that the partial surface preferably runs in the shape of a truncated cone or even, wherein the partial surface could also have a different course shape, for example a curved or polygonal course.
Eine Vorderseite der Deckplatte umfasst insbesondere eine Teiloberfläche, deren Verlauf derart der Rückseite des Schraubenzentrifugalrades angepasst ausgestaltet ist, dass zwischen der Vorderseite der Deckplatte und der Rückseite des Schraubenzentrifugalrades ein Spalt von maximal bis zu 3 mm ausgebildet ist. Vorzugsweise weist der Spalt eine Breite im Bereich von 0,5 mm bis 2 mm auf.A front side of the cover plate comprises in particular a partial surface, the course of which is designed to match the rear side of the screw centrifugal wheel such that a gap of up to 3 mm is formed between the front side of the cover plate and the rear side of the screw centrifugal wheel. The gap preferably has a width in the range from 0.5 mm to 2 mm.
Insbesondere weist das Schraubenzentrifugalrad eine Drehrichtung auf. Bevorzugt weist die Teiloberfläche eine spiralförmig verlaufende Vertiefung auf, welche im Wesentlichen im Bereich der Mittenöffnung beginnend entlang der Teiloberfläche nach Aussen verläuft. Vorteilhaft verläuft die spiralförmig verlaufende Vertiefung in Drehrichtung von Innen nach Aussen.In particular, the screw centrifugal wheel has a direction of rotation. The partial surface preferably has a spiral-shaped depression, which essentially runs outwards along the partial surface, starting in the region of the central opening. The spiral-shaped depression advantageously runs in the direction of rotation from the inside to the outside.
Vorteilhaft verläuft die Durchbrechung entgegengesetzt zur Drehrichtung des Schraubenzentrifugalrades. Bevorzugt verläuft eine durch eine Eintrittsöffnung der Durchbrechung gebildete Eintrittsfläche im Wesentlichen parallel zur Rotationsachse und abgewandt zur Drehrichtung. Besonders bevorzugt besteht die Deckplatte aus einem Metallblech.The opening advantageously runs counter to the direction of rotation of the screw centrifugal wheel. An entry surface formed by an entry opening of the opening preferably runs essentially parallel to the axis of rotation and facing away from Direction of rotation. The cover plate particularly preferably consists of a metal sheet.
Weiter wird offenbart eine Schraubenzentrifugalradpumpe umfassend ein Pumpengehäuse mit einer Pumpeneinströmöffnung und einer der Pumpeneinströmöffnung gegenüberliegend angeordneten Gehäuserückwand, umfassend ein innerhalb des Pumpengehäuses drehbar angeordnetes Schraubenzentrifugalrad mit einer Nabe sowie einer Schaufel, sowie umfassend eine drehbare Antriebswelle welche mit dem Schraubenzentrifugalrad verbunden ist, sowie umfassend eine Deckplatte welche zwischen dem Schraubenzentrifugalrad und der Gehäuserückwand angeordnet ist, wobei die Deckplatte eine Mittenöffnung aufweist durch welche die Nabe oder die Antriebswelle verläuft, und wobei zwischen der Deckplatte und der Gehäuserückwand ein Innenraum ausgebildet ist, wobei die Deckplatte eine zur Pumpeneinströmöffnung hin ausgerichtete Vorderseite aufweist, und wobei die Vorderseite eine Teiloberfläche umfasst deren Verlauf derart der Rückseite des Schraubenzentrifugalrades angepasst ausgestaltet ist, dass zwischen der Vorderseite der Deckplatte und der Rückseite des Schraubenzentrifugalrades ein Spalt von maximal bis zu 3 mm ausgebildet ist, wobei zwischen der Mittenöffnung der Deckplatte und der Nabe oder der Antriebswelle ein Spalt ausgebildet ist, der Fluid leitend mit dem Innenraum sowie dem Spalt verbunden ist, wobei die Deckplatte zumindest eine Durchbrechung aufweist welche beabstandet zur Mittenöffnung angeordnet ist, wobei das Schraubenzentrifugalrad und die Anordnung der Durchbrechung derart gegenseitig angepasst ausgestaltet sind, dass die Rückseite des Schraubenzentrifugalrades die Durchbrechung nicht bedeckt oder bei einer Rotation des Schraubenzentrifugalrades um 360° nur während eines Teilwinkels bedeckt, und wobei die Durchbrechung eine Fluid leitende Verbindung zwischen der Vorderseite und dem Innenraum ausbildet, um einen Fluidstrom zu erzeugen, der über die Durchbrechung in den Innenraum hinein strömt und über den Spalt wieder aus dem Innenraum hinaus strömt.Also disclosed is a screw centrifugal wheel pump comprising a pump housing with a pump inflow opening and a housing rear wall arranged opposite the pump inflow opening, comprising a screw centrifugal wheel rotatably arranged within the pump housing with a hub and a blade, and also comprising a rotatable drive shaft which is connected to the screw centrifugal wheel, and also comprises a cover plate which is arranged between the screw centrifugal impeller and the rear wall of the housing, the cover plate having a central opening through which the hub or the drive shaft runs, and an interior space being formed between the cover plate and the rear wall of the housing, the cover plate having a front side oriented towards the pump inflow opening, and wherein the front side comprises a partial surface, the course of which is designed to be adapted to the rear side of the screw centrifugal wheel such that between the front side a gap of up to 3 mm is formed between the cover plate and the rear of the screw centrifugal wheel, a gap being formed between the center opening of the cover plate and the hub or the drive shaft, the fluid being conductively connected to the interior and the gap, the cover plate has at least one opening which is spaced apart from the center opening, the screw centrifugal wheel and the arrangement of the opening being designed such that the rear of the screw centrifugal wheel does not cover the opening or only covers a partial angle when the screw centrifugal wheel rotates through 360 °, and wherein the opening forms a fluid-conducting connection between the front and the interior, in order to generate a fluid flow that passes over the Breakthrough flows into the interior and flows out of the interior again via the gap.
Ferner wird offenbart ein Verfahren zur Selbstreinigung einer Schraubenzentrifugalradpumpe aufweisend ein drehbar gelagertes Schraubenzentrifugalrad sowie eine unter Ausbildung eines Spaltes auf der Rückseite des Schraubenzentrifugalrades angeordnete Deckplatte mit einer Mittenöffnung, wobei die Deckplatte eine Durchbrechung aufweist, welche bezüglich der Mittenöffnung beabstandet ist, wobei eine Nabe oder eine Antriebswelle des Schraubenzentrifugalrades durch die Mittenöffnung verläuft, sodass sich zwischen der Mittenöffnung und der Nabe oder der Antriebswelle ein Fluid leitender Spalt ausbildet, wobei das Schraubenzentrifugalrad und die Anordnung der Durchbrechung derart gegenseitig angepasst ausgestaltet sind, dass die Rückseite des Schraubenzentrifugalrades die Durchbrechung während dem Rotieren des Schraubenzentrifugalrades nicht bedeckt wird oder nur während eines Teilwinkels Δ bedeckt wird, wobei das Schraubenzentrifugalrad in Drehrichtung rotiert wird und dadurch ein Fluid entlang eines Hauptstromes gefördert wird, wobei ein Teilstrom F1 des Fluides über die Durchbrechung zur Rückseite der Deckplatte strömt, und wobei dieser Teilstrom danach über die Spalten wieder zum Hauptstrom strömt, auf Grund der zwischen der Durchbrechung und dem Spalt herrschenden Druckdifferenz.Furthermore, a method for self-cleaning a screw centrifugal wheel pump is disclosed, comprising a rotatably mounted screw centrifugal wheel and a cover plate with a central opening arranged to form a gap on the rear side of the screw centrifugal wheel, the cover plate having an opening which is spaced apart from the center opening, a hub or a The drive shaft of the screw centrifugal wheel runs through the center opening, so that a fluid-conducting gap is formed between the center opening and the hub or the drive shaft, the screw centrifugal wheel and the arrangement of the opening being mutually adapted such that the rear side of the screw centrifugal wheel has the opening during the rotation of the Screw centrifugal wheel is not covered or is only covered during a partial angle Δ, the screw centrifugal wheel being rotated in the direction of rotation and thereby releasing a fluid ang a main flow is promoted, a partial flow F1 of the fluid flows through the opening to the rear of the cover plate, and this partial flow then flows back over the columns to the main flow, due to the pressure difference between the opening and the gap.
Ferner wird offenbart eine Deckplatte für eine Schraubenzentrifugalradpumpe, wobei die Deckplatte eine Vorderseite und eine Rückseite aufweist, und wobei die Deckplatte in deren Zentrum eine Mittenöffnung aufweist, wobei die Mittenöffnung zum Durchtritt einer Rotationsachse des Schraubenzentrifugalrades angepasst ausgestaltet ist und in Richtung der Rotationsachse verläuft, und wobei die Deckplatte zumindest eine Durchbrechung aufweist welche beabstandet zur Mittenöffnung angeordnet ist, und wobei die Durchbrechung eine Fluid leitende Verbindung zwischen der Vorderseite und der Rückseite der Deckplatte ausbildet, und wobei die Durchbrechung zur Vorderseite hin eine Eintrittsöffnung aufweist, und wobei die Vorderseite eine Vertiefung aufweist, wobei die Eintrittsöffnung in dieser Vertiefung angeordnet ist, und wobei die Eintrittsöffnung eine Eintrittsfläche ausbildet, die im Wesentlichen parallel zur Rotationsachse A verläuft.Furthermore, a cover plate for a screw centrifugal wheel pump is disclosed, wherein the cover plate has a front side and a rear side, and wherein the cover plate has a center opening in the center thereof, the center opening being configured to pass through an axis of rotation of the screw centrifugal wheel and running in the direction of the axis of rotation, and wherein the cover plate has at least one opening which is spaced from the central opening, and wherein the opening has a fluid-conducting connection between the Forms front and rear of the cover plate, and wherein the opening has an inlet opening towards the front, and wherein the front has a recess, the inlet opening being arranged in this recess, and wherein the inlet opening forms an inlet surface that is substantially parallel to the axis of rotation A runs.
Darüber hinaus wird vorteilhaft vorgeschlagen, dass eine Nabe des Schraubenzentrifugalrades ein kreisförmiges Basisteil umfasst, dass eine Schaufel des Schraubenzentrifugalrades auf dem kreisförmigen Basisteil angeordnet ist, und dass das kreisförmige Basisteil konzentrisch zur Drehachse angeordnet ist und einen maximalen Radius aufweist, wobei der maximale Radius derart bezüglich der Durchbrechung angepasst ist, dass das Basisteil die Durchbrechung nicht bedeckt.In addition, it is advantageously proposed that a hub of the screw centrifugal wheel comprises a circular base part, that a blade of the screw centrifugal wheel is arranged on the circular base part, and that the circular base part is arranged concentrically to the axis of rotation and has a maximum radius, the maximum radius in this respect the opening is adapted so that the base part does not cover the opening.
Zudem wird vorteilhaft vorgeschlagen, dass eine Nabe des Schraubenzentrifugalrades ein sichelförmiges Basisteil umfasst, dass eine Schaufel des Schraubenzentrifugalrades auf dem sichelförmigen Basisteil angeordnet ist, und dass das sichelförmige Basisteil bezüglich der Drehachse einen maximalen Radius und einen minimalen Radius aufweist, wobei das sichelförmige Basisteil bezüglich der Durchbrechung derart verlaufend ausgestaltet ist, dass das Basisteil die Durchbrechung beim minimalen Radius nicht bedeckt, und dass das Basisteil die Durchbrechung bei einer Rotation des Schraubenzentrifugalrades um 360° während eines Teilwinkels bedeckt.In addition, it is advantageously proposed that a hub of the screw centrifugal wheel comprises a crescent-shaped base part, that a blade of the screw centrifugal wheel is arranged on the crescent-shaped base part, and that the crescent-shaped base part has a maximum radius and a minimum radius with respect to the axis of rotation, the crescent-shaped base part with respect to The opening is designed in such a way that the base part does not cover the opening at the minimum radius and that the base part covers the opening when the screw centrifugal wheel rotates through 360 ° during a partial angle.
Die Erfindung wird nachfolgend an Hand von Ausführungsbeispielen im Detail beschrieben.The invention is described in detail below using exemplary embodiments.
Die zur Erläuterung der Ausführungsbeispiele verwendeten Zeichnungen zeigen:
- Fig. 1
- einen Axialschnitt einer aus dem Stand der Technik bekannten Schraubenzentrifugalradpumpe;
- Fig. 1a
- eine Seitenansicht der in
dargestellten Schraubenzentrifugalradpumpe bei weg gebrochenem Aussengehäuse;Figur 1 - Fig. 1b
- eine Draufsicht auf ein Laufrad;
- Fig. 2
- in einem Längsschnitt eine Teilansicht einer Schraubenzentrifugalradpumpe mit einem Ausführungsbeispiel einer Deckscheibe;
Figuren 3 bis 5- unterschiedlich verlaufende Durchbrechungen;
- Fig. 6
- eine Draufsicht auf eine Deckscheibe;
- Fig. 7
- eine perspektivische Ansicht der in
Figur 6 dargestellten Deckscheibe; - Fig. 8
- einen Schnitt durch die Deckscheibe gemäss
Figur 6 entlang der Linie B-B; - Fig. 9
- einen Schnitt durch ein weiteres Ausführungsbeispiel einer Deckscheibe;
- Fig. 10, 11
- schematisch einen Schnitt durch zwei weitere Ausführungsbeispiele von Deckscheiben:
- Fig. 12
- eine Seitenansicht eines weiteren Ausführungsbeispiels eines Laufrades einer Schraubenzentrifugalradpumpe bei weg gebrochenem Aussengehäuse;
- Fig. 13
- eine Draufsicht auf das Laufrad der in
Figur 12 dargestellten Schraubenzentrifugalradpumpe; - Fig. 14
- eine Draufsicht auf ein weiteres Ausführungsbeispiel einer Deckscheibe.
- Fig. 1
- an axial section of a screw centrifugal wheel pump known from the prior art;
- Fig. 1a
- a side view of the in
Figure 1 Screw centrifugal wheel pump shown with broken outer housing; - Fig. 1b
- a plan view of an impeller;
- Fig. 2
- in a longitudinal section a partial view of a screw centrifugal pump with an embodiment of a cover plate;
- Figures 3 to 5
- different openings;
- Fig. 6
- a plan view of a cover plate;
- Fig. 7
- a perspective view of the in
Figure 6 illustrated cover plate; - Fig. 8
- a section through the cover plate according
Figure 6 along the line BB; - Fig. 9
- a section through a further embodiment of a cover plate;
- 10, 11
- schematically a section through two further embodiments of cover plates:
- Fig. 12
- a side view of another embodiment of an impeller of a screw centrifugal pump with broken outer housing;
- Fig. 13
- a plan view of the impeller of the in
Figure 12 illustrated screw centrifugal pump; - Fig. 14
- a plan view of another embodiment of a cover plate.
Grundsätzlich sind in den Zeichnungen gleiche Teile mit gleichen Bezugszeichen versehen.In principle, the same parts are provided with the same reference symbols in the drawings.
Es hat sich jedoch gezeigt, dass trotz dieser Massnahme Verunreinigungen in den Innenraum 37 gelangen können, wobei sich diese Verunreinigungen im Innenraumes 37 ablagern und aufakkumulieren können, sodass in gewissen Zeitabständen eine Reinigung der Schraubenzentrifugalradpumpe erforderlich ist.However, it has been shown that despite this measure, contaminants can get into the interior 37, and these contaminants can accumulate and accumulate in the interior 37, so that cleaning of the screw centrifugal wheel pump is necessary at certain time intervals.
Die Schraubenzentrifugalradpumpe 1 umfasst zudem eine Deckplatte 2, welche in Verlaufsrichtung der Achse A unmittelbar hinter der Nabe 21 beziehungsweise des Schraubenzentrifugalrades 20 angeordnet ist. Die Deckplatte 2 weist eine Vorderseite 2h und eine Rückseite 2i auf, wobei die Vorderseite 2h eine Teiloberfläche 2k umfasst deren Verlauf derart der Rückseite 25a des Schraubenzentrifugalrades 20 angepasst ausgestaltet ist, dass zwischen der Vorderseite 2h der Deckplatte 2 und der Rückseite 25a des Schraubenzentrifugalrades 20 ein Spalt 24 von maximal bis zu 3 mm ausgebildet ist. Vorzugsweise weist der Spalt 24 eine Breite im Bereich zwischen 0,5 mm und 2 mm auf. Der Spalt 24 ist unter anderem derart schmal ausgestaltet, damit sich Feststoffe, zum Beispiel im Abwasser vorkommende Gewebe wie Damenstrümpfe, nicht in den Spalt 24 eindringen können oder sich gar um die Nabe wickeln können. Der schmale Spalt 24 erzeugt zudem eine Scherwirkung auf sich innerhalb des Spaltes 24 befindende Feststoffe, sodass diese mechanisch zerkleinert werden und zum Hauptstrom F hin gefördert werden. In einer bevorzugten Ausgestaltung ist zumindest eine der zum Spalt 24 hin ausgerichteten Oberflächen strukturiert, rau oder zum Beispiel mit vorstehenden Zähnen verstehen ausgestaltet, um eine mechanische Zerkleinerung von sich im Spalt 24 befindlichen Feststoffen zu verbessern. Ein Spalt 24, der breiter als 3 mm wäre, zum Beispiel 5 mm oder breiter, hätte mehrere Nachteile. Einerseits wäre auf Grund des breiten Spaltes 24 die mechanische Zerkleinerung von Feststoffen nicht mehr gewährleistet. Zudem würde ein breiter Spalt 24 den Wirkungsgrad der Schraubenzentrifugalradpumpe 1 erheblich reduzierten. Die Vorderseite 2h im dargestellten Ausführungsbeispiel umfasst eine im Wesentlichen kegelstumpfförmig verlaufende Teiloberfläche 2k, deren Verlauf der Rückseite einem Schraubenzentrifugalrad 20 angepasst ausgestaltet ist, wobei die Teiloberfläche 2k in deren Zentrum eine Mittenöffnung 2g aufweist, wobei die Mittenöffnung 2g parallel in Richtung der Achse A verläuft. Die Nabe 21 verläuft durch die Mittenöffnung 2g, sodass sich zwischen der Mittenöffnung 2g und der Nabe 21 ein in Richtung der Achse A verlaufender Spalt 2b ausbildet. Die Nabe 21 weist zudem eine Auskragung auf, welche teilweise die Teiloberfläche 2k bedeckt, sodass sich zwischen der Nabe 21 und der Teiloberfläche 2k ein im dargestellten Ausführungsbeispiel bezüglich der Achse A quer verlaufender Spalt 24 ausbildet. Die Deckplatte 2 weist zumindest eine Durchbrechung 2a auf, welche beabstandet zur Mittenöffnung 2g angeordnet ist, wobei die Durchbrechung 2a eine Fluid leitende Verbindung zwischen der Vorderseite 2h und der Rückseite 2i der Deckplatte 2 ausbildet. Während dem Pumpbetrieb, beziehungsweise während der Rotation des Schaufelzentrifugalrades 20 in Drehrichtung R, weist das Fluid im Bereich der Durchbrechung 2a einen höheren Druck auf als im Bereich der Mittenöffnung 2g, wodurch ein Teilstrom F1 erzeugt wird, indem ein Teil des Hauptstromes F als Teilstrom F1 durch die Öffnung 2a zur Rückseite 2i der Deckplatte 2 in den Innenraum 37 strömt, und danach über den Spalt 2b und den Spalt 24 wieder in den Hauptstrom F strömt. Dieser Teilstrom F1 bewirkt, dass Verschmutzungen, die sich im Innenraum 37 befinden, aus diesem herausgefördert werden und dem Hautstrom F zugeführt werden.The screw
Das Schraubenzentrifugalrad 20 und die Anordnung der Durchbrechung 2a sind derart gegenseitig angepasst ausgestaltet, dass die Rückseite 25a des Schraubenzentrifugalrades 20 die Durchbrechung 2a nicht bedeckt oder bei einer Rotation des Schraubenzentrifugalrades 20 um 360° nur während eines Teilwinkels Δ bedeckt.The screw
In einer vorteilhaften Ausgestaltung könnte das Schraubenzentrifugalrad 20 wie in den
In einer weiteren vorteilhaften Ausgestaltung könnte das Schraubenzentrifugalrad 20 wie in den
Die Antriebswelle 33 könnte auch weiter vorgezogen sein, sodass der Spalt 2b zumindest teilweise oder auch ausschliesslich zwischen der Deckplatte 2 und der Antriebswelle 33 ausgebildet wird.The
Die Deckplatte 2 weist zumindest eine Durchbrechung 2a auf und vorzugsweise zumindest zwei Durchbrechungen 2a. Vorteilhafterweise sind die Durchbrechungen 2a in der Teiloberfläche 2k symmetrisch bezüglich der Achse A angeordnet. Die Durchbrechungen 2a können in einer Vielzahl von Möglichkeiten ausgestaltet sein. Die in
Die Deckplatte 2 könnte, ähnlich wie die in
Die in
Die
Abhängig vom jeweils verwendeten Schraubenzentrifugalrad 20 wird von der Rückseite 25a des Schraubenzentrifugalrades 20 eine unterschiedlich grosse Teiloberfläche 2k bedeckt. Unter Verwendung des in den
In einer vorteilhaften Ausführungsform weist die Deckplatte 2, wie in den
Die Deckplatte 2 kann, wie in den
In einer vorteilhaften Ausgestaltung ist die Deckplatte 2 als Gussstück ausgestaltet, wobei die Vertiefung 2c und vorteilhafterweise auch die Durchbrechung 2a beziehungsweise die Eintrittsöffnung 21 bereits ein Teil des noch unbearbeiteten Gussstücks bilden. Zur Fertigstellung der Deckplatte 2 ist es dann im Wesentlichen noch erforderlich die Vorderseite 2h zu bearbeiten, insbesondere durch Span abhebende Bearbeitung. Eine Deckplatte 2 hergestellt aus einem derart ausgestalteten Gussstück weist den Vorteil auf, dass sich bei der Herstellung keine oder nur sehr geringe Mehrkosten ergeben, da die Span abhebende Bearbeitung der Deckplatte 2 sowieso erforderlich ist. Die in den
Das erfindungsgemässe Verfahren ermöglicht die Selbstreinigung einer Schraubenzentrifugalradpumpe 1. Dabei weist die Schraubenzentrifugalradpumpe 1 ein drehbar gelagertes Schraubenzentrifugalrad 20 sowie eine unmittelbar neben beziehungsweise hinter dem Schraubenzentrifugalrad 20 angeordnete Deckplatte 2 mit einer Mittenöffnung 2g auf, wobei eine Nabe 21 des Schraubenzentrifugalrades 20 oder eine das Schraubenzentrifugalrad 15 lagernde Achse 33 durch die Mittenöffnung 2g verläuft, sodass sich zwischen der Mittenöffnung 2g und der Nabe 21 oder der Achse 33 ein Fluid leitender Spalt 2b ausbildet. Wenn das Schraubenzentrifugalrad 20 in Drehrichtung R rotiert wird und dadurch ein Fluid entlang eines Hauptstromes F gefördert wird, so wird ein Teilstrom F1 des Fluides über eine bezüglich der Mittenöffnung 2g beabstandete Durchbrechung 2a zur Rückseite 2i der Deckplatte 2 strömen und dieser Teilstrom F1 danach über den Spalt 2b wieder zum Hauptstrom F strömen, auf Grund der zwischen der Durchbrechung 2a und dem Spalt 2b herrschenden Druckdifferenz. Dieser Teilstrom F1 fördert allfällig sich im Raum hinter der Deckplatte 2 befindlichen Verunreinigungen wieder zum Hauptstrom F. Vorteilhafterweise weist die Deckplatte 2 auf deren Vorderseite 2h an deren Teiloberfläche 2k eine spiralförmig verlaufende Vertiefung 2d auf, wobei die spiralförmig verlaufende Vertiefung 2d in Drehrichtung R von Innen nach Aussen verläuft, sodass der aus dem Spalt 2b austretende Teilstrom F1 und die sich gegebenenfalls darin befindlichen Verunreinigungen über die spiralförmig verlaufende Vertiefung 2d dem Hauptstrom F zugeführt wird.The method according to the invention enables a screw
In den dargestellten Ausführungsbeispielen sind die Deckplatte 2 sowie die Gehäuserückwand 23 immer als separate Teile dargestellt. Die Deckplatte 2 sowie die Gehäuserückwand 23 könnten auch einstückig ausgestaltet sein, beispielsweise indem diese aus einem einzigen Teil, zum Beispiel ein Gussteil gefertigt sind. Ein solches einzige Gussteil, umfassend sowohl die Deckplatte 2 als auch die Gehäuserückwand 23, weist den Vorteil auf, dass dieses kostengünstig herstellbar ist, und dass zwischen Deckplatte 2 und Gehäuserückwand 23 keine Dichtung mehr erforderlich ist. Dies ermöglicht eine besonders wartungsarme Ausführungsform.In the illustrated embodiments, the
Claims (14)
- Screw-type centrifugal wheel pump (1), comprising a pump housing (3) with a pump inflow opening (3a), comprising a screw-type centrifugal wheel (20) with a hub (21) and/or with a drive shaft (33), further comprising a cover plate (2),
the cover plate (2) being arranged on a side (25a) of the screw-type centrifugal wheel (20) that is situated opposite the pump inflow opening (3a) and directly behind the screw-type centrifugal wheel (20),
the cover plate (2) comprising a central opening (2g) through which the hub (21) or the drive shaft (33) extends,
the cover plate (2) comprising a front side (2h) that is oriented towards the pump inflow opening (3a), and
the front side (2h) comprising a partial surface (2k) the course of which is embodied to be adapted to the rear side (25a) of the screw-type centrifugal wheel (20) in such a way that a first gap (24) of maximally up to 3 mm is formed between the front side (2h) of the cover plate (2) and the rear side (25a) of the screw-type centrifugal wheel (20),
a second gap (2b) being formed between the central opening (2g) of the cover plate (2) and the hub (21) and/or the drive shaft (33),
the cover plate (2) comprising at least one through-hole (2a), which is arranged spaced apart from the central opening (2g),
the through-hole (2a) having an inlet opening (21) towards the front side (2h), the front side (2h) comprising a hollow (2c) and the inlet opening (21) being arranged in the hollow (2c),
characterised in that
the hollow (2c) is embodied at least partly by a bore extending substantially perpendicularly or perpendicularly to a rotary axis (A). - Screw-type centrifugal wheel pump (1) according to claim 1,
characterised in that the pump housing (3) comprises a housing rear wall (23) that is arranged opposite the pump inflow opening (3a),
the cover plate (2) being arranged between the screw-type centrifugal wheel (20) and the housing rear wall (23) and an inner space (37) being formed between the cover plate (2) and the housing rear wall (23). - Screw-type centrifugal wheel pump (1) according to claim 1 or 2, characterised in that the second gap (2b) is fluid-conductively connected to the inner space (37) and to the first gap (24).
- Screw-type centrifugal wheel pump (1) at least according to claim 1 or 2, characterised in that the through-hole (2a) forms a fluid-conducting connection between the front side (2h) and the inner space (37) for the purpose of generating a fluid flow (F1) that flows into the inner space (37) via the through-hole (2a) and flows back out of the inner space (37) via the second gap (2b).
- Screw-type centrifugal wheel pump (1) according to one of the preceding claims, characterised in that the screw-type centrifugal wheel (20) is arranged rotatably within the pump housing (3),
the screw-type centrifugal wheel (20) and the arrangement of the through-hole (2a) being implemented to be adapted to each other in such a way that, in a viewing direction in parallel to a rotary axis (A) of the screw-type centrifugal wheel (20), the rear side (25a) of the screw-type centrifugal wheel (20) does not cover the through-hole (2a) or, in a rotation of the screw-type centrifugal wheel (20) by 360 degrees, covers the through-hole (2a) only during a partial angle. - Screw-type centrifugal wheel pump (1) according to one of the preceding claims, characterised in that the screw-type centrifugal wheel (20) comprises the hub (21) as well as an impeller (25), and the screw-type centrifugal wheel pump (1) further comprises a rotatable drive shaft (33) which is connected to the screw-type centrifugal wheel (20).
- Screw-type centrifugal wheel pump (1) according to one of the preceding claims, characterised in that the inlet opening (21) forms an inlet surface (2m) extending substantially parallel to the rotary axis (A).
- Screw-type centrifugal wheel pump (1) according to one of the preceding claims, characterised in that the inlet opening (21) forms an inlet surface (2m) extending substantially parallel to the rotary axis (A).
- Screw-type centrifugal wheel pump (1) according to one of the preceding claims, characterised in that at least a partial surface (2k) of the front side (2h) extends substantially frusto-conically or substantially planar.
- Screw-type centrifugal wheel pump (1) according to one of the preceding claims, characterised in that the cover plate (2) comprises at least two through-holes (2a), the at least two through-holes (2a) being in particular arranged symmetrically to the rotary axis (A).
- Screw-type centrifugal wheel pump (1) according to one of the preceding claims, characterised in that the cover plate (2) consists of a cast piece and that the hollow (2c) and advantageously also the inlet opening (21) already form part of the unprocessed cast piece.
- Screw-type centrifugal wheel pump (1) according to one of the preceding claims, characterised in that the through-hole (2a) extends perpendicularly or substantially perpendicularly with respect to the front side (2h) or to the partial surface (2k).
- Screw-type centrifugal wheel pump (1) according to one of the preceding claims, characterised in that the through-hole (2a) extends transversely with respect to the front side (2h) or to the partial surface (2k).
- Screw-type centrifugal wheel pump (1) according to one of the preceding claims, characterised in that the partial surface (2h) comprises a spirally extending hollow (2d), which substantially extends, starting in a region of the central opening (2g), outwards along the partial surface (2h).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10192467A EP2458225A1 (en) | 2010-11-24 | 2010-11-24 | Covering board for a screw centrifuge wheel pump and screw centrifuge wheel pump comprising such a covering board |
EP11796936.0A EP2643595B1 (en) | 2010-11-24 | 2011-11-24 | Self cleaning radial flow pump with recirculation behind the impeller |
PCT/EP2011/070995 WO2012069618A1 (en) | 2010-11-24 | 2011-11-24 | Self-cleaning screw-type centrifugal wheel pump with recirculation behind the impeller |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11796936.0A Division EP2643595B1 (en) | 2010-11-24 | 2011-11-24 | Self cleaning radial flow pump with recirculation behind the impeller |
EP11796936.0A Division-Into EP2643595B1 (en) | 2010-11-24 | 2011-11-24 | Self cleaning radial flow pump with recirculation behind the impeller |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3179112A1 EP3179112A1 (en) | 2017-06-14 |
EP3179112B1 true EP3179112B1 (en) | 2020-08-05 |
Family
ID=43828365
Family Applications (4)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10192467A Withdrawn EP2458225A1 (en) | 2010-11-24 | 2010-11-24 | Covering board for a screw centrifuge wheel pump and screw centrifuge wheel pump comprising such a covering board |
EP17152843.3A Active EP3179112B1 (en) | 2010-11-24 | 2011-11-24 | Pump cover plate with through holes that are designed as inertial filters |
EP11799082.0A Active EP2643596B1 (en) | 2010-11-24 | 2011-11-24 | Self-cleaning centrifugal screw pump with auxiliary flushing flow behind the impeller |
EP11796936.0A Active EP2643595B1 (en) | 2010-11-24 | 2011-11-24 | Self cleaning radial flow pump with recirculation behind the impeller |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10192467A Withdrawn EP2458225A1 (en) | 2010-11-24 | 2010-11-24 | Covering board for a screw centrifuge wheel pump and screw centrifuge wheel pump comprising such a covering board |
Family Applications After (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11799082.0A Active EP2643596B1 (en) | 2010-11-24 | 2011-11-24 | Self-cleaning centrifugal screw pump with auxiliary flushing flow behind the impeller |
EP11796936.0A Active EP2643595B1 (en) | 2010-11-24 | 2011-11-24 | Self cleaning radial flow pump with recirculation behind the impeller |
Country Status (7)
Country | Link |
---|---|
US (2) | US9709071B2 (en) |
EP (4) | EP2458225A1 (en) |
JP (2) | JP6028162B2 (en) |
CN (2) | CN103339386B (en) |
DK (3) | DK2643595T3 (en) |
RU (2) | RU2566865C2 (en) |
WO (2) | WO2012069618A1 (en) |
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CN104131980B (en) * | 2014-08-14 | 2017-01-25 | 杨付许 | Drum-type slurry whitewashing machine and slurry pump thereof |
ES2756602T3 (en) * | 2015-06-03 | 2020-04-27 | Gea Tuchenhagen Gmbh | Impeller for a centrifugal pump and centrifugal pump |
RU170010U1 (en) * | 2016-09-28 | 2017-04-11 | Валентина Ильинична Жушман | SINGLE AUGER PUMP PUMP |
AU2018348789A1 (en) | 2017-10-12 | 2021-06-17 | Weir Minerals Australia Ltd | Inlet component for a slurry pump |
CN112941827B (en) * | 2019-11-26 | 2022-12-09 | 青岛海尔洗衣机有限公司 | Pulsator washing machine with self-cleaning device |
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- 2011-11-24 CN CN201180056678.6A patent/CN103299085B/en active Active
- 2011-11-24 EP EP17152843.3A patent/EP3179112B1/en active Active
- 2011-11-24 US US13/989,086 patent/US9709071B2/en active Active
- 2011-11-24 JP JP2013540376A patent/JP6028162B2/en active Active
- 2011-11-24 JP JP2013540375A patent/JP5988106B2/en active Active
- 2011-11-24 DK DK11796936.0T patent/DK2643595T3/en active
- 2011-11-24 DK DK17152843.3T patent/DK3179112T3/en active
- 2011-11-24 WO PCT/EP2011/070995 patent/WO2012069618A1/en active Application Filing
- 2011-11-24 EP EP11799082.0A patent/EP2643596B1/en active Active
- 2011-11-24 US US13/989,083 patent/US9879695B2/en active Active
- 2011-11-24 WO PCT/EP2011/070996 patent/WO2012069619A1/en active Application Filing
- 2011-11-24 RU RU2013128547/06A patent/RU2566865C2/en not_active IP Right Cessation
- 2011-11-24 EP EP11796936.0A patent/EP2643595B1/en active Active
- 2011-11-24 DK DK11799082.0T patent/DK2643596T3/en active
- 2011-11-24 RU RU2013128532/06A patent/RU2559958C2/en not_active IP Right Cessation
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Also Published As
Publication number | Publication date |
---|---|
CN103339386A (en) | 2013-10-02 |
CN103339386B (en) | 2017-03-29 |
EP2643596A1 (en) | 2013-10-02 |
JP5988106B2 (en) | 2016-09-07 |
EP2643596B1 (en) | 2017-07-12 |
RU2013128532A (en) | 2014-12-27 |
US9709071B2 (en) | 2017-07-18 |
EP2643595A1 (en) | 2013-10-02 |
DK2643596T3 (en) | 2017-10-30 |
EP3179112A1 (en) | 2017-06-14 |
WO2012069619A1 (en) | 2012-05-31 |
EP2643595B1 (en) | 2017-05-24 |
JP2014502328A (en) | 2014-01-30 |
RU2013128547A (en) | 2014-12-27 |
EP2458225A1 (en) | 2012-05-30 |
US9879695B2 (en) | 2018-01-30 |
DK2643595T3 (en) | 2017-09-18 |
RU2559958C2 (en) | 2015-08-20 |
CN103299085A (en) | 2013-09-11 |
DK3179112T3 (en) | 2020-10-12 |
US20130243634A1 (en) | 2013-09-19 |
JP6028162B2 (en) | 2016-11-16 |
JP2014500930A (en) | 2014-01-16 |
RU2566865C2 (en) | 2015-10-27 |
US20130243568A1 (en) | 2013-09-19 |
CN103299085B (en) | 2016-11-16 |
WO2012069618A1 (en) | 2012-05-31 |
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