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
  • F04D29/02—Selection of particular materials
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
  • F04D17/08—Centrifugal pumps
  • F04D17/16—Centrifugal pumps for displacing without appreciable compression
  • F04D17/165—Axial entry and discharge
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D25/00—Pumping installations or systems
  • F04D25/02—Units comprising pumps and their driving means
  • F04D25/04—Units comprising pumps and their driving means the pump being fluid-driven
• • 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
  • F04D29/18—Rotors
  • F04D29/181—Axial flow rotors
  • F04D29/183—Semi axial flow rotors
• • 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
  • F04D29/18—Rotors
  • F04D29/22—Rotors specially for centrifugal pumps
  • F04D29/2238—Special flow patterns
  • F04D29/2255—Special flow patterns flow-channels with a special cross-section contour, e.g. ejecting, throttling or diffusing effect

Definitions

• the invention relates to a medium transmission and has for its object to embody such a transmission, which is known in many embodiments, such that it combines a very high efficiency with very little wear and noise production and moreover has a considerably increased range of operation.
• the invention provides a rotating medium transmission of the type specified in claim 1.
• Serving as elucidation of the invention is the following description of the new rotating device which is applied in the medium transmission according to the invention.
• Rotation devices are known in many embodiments.
• a centrifugal pump is for instance known with an axial inlet and a rotor with blades for flinging a liquid for pumping radially outward under the influence of centrifugal forces, and one or more for instance tangential outlets.
• an axial compressor having groups of rotor and stator blades ordered in cascade.
• the structure comprises many thousands of components of extremely complex form which must moreover comply with high standards of dimensional accuracy and mechanical strength.
• An example hereof is a gas turbine, wherein in this case gaseous medium under pressure is delivered by a source intended for this purpose and is directed onto the blades of a rotor such that this rotor is driven with force, for instance to rotatingly drive a machine such as an electric generator.
• the known devices are moreover usually voluminous, heavy and expensive.
• the blades In the use of casting techniques to manufacture a rotor the blades must have a certain minimal wall thickness, which gives rise to undesirable reductions in the effective through-flow volume and losses due to release and wake-forming.
• the blade wall thickness and the required blade form moreover limit the number of blades which can be accommodated.
• the casting technique unavoidably results in undesired surface roughness and imbalance as a consequence of unintended and unmanageable differences in density, for instance as a result of inclusions.
• the tensile strength of cast metals and alloys is also limited.
• centrifugal pumps are further affected by so-called slippage, the phenomenon of the flow having little adhesion to the suction side of the flow channel bounded by adjoining blades. Owing to the expansion angle between the blades there is a slippage area or an area with "stagnant" water in which a large-scale stationary turbulence is located, whereby the through-flow in that area is zero.
• slippage the phenomenon of the flow having little adhesion to the suction side of the flow channel bounded by adjoining blades. Owing to the expansion angle between the blades there is a slippage area or an area with "stagnant" water in which a large-scale stationary turbulence is located, whereby the through-flow in that area is zero.
• the outlet pressure of the centrifugal pump is strongly pulsating as a result.
• known devices are constructed such that they produce a great deal of noise during operation.
• Claim 2 relates to an embodiment in which the rotation speed of the output shaft is adjustable.
• Claim 3 relates to an embodiment which is particularly suitable for applications wherein the medium is gaseous or a two-phase medium.
• the buffer volume is an expansion tank which is able to buffer and thus level out pressure fluctuations.
• the embodiment according to claim 6 has the advantage that due to the aligned arrangement of the input shaft and the output shaft the transmission can, if desired, be placed in an environment in which it has to be coupled with aligned rotating components.
• the structure according to claim 7 has the advantage of an integrated construction.
• Claim 10 describes in general terms a possible form of the rotor channels. Claims 11, 12 and 13 give increasing preferences for the number of rotor channels.
• Claim 14 relates to a structure of the rotation device which prevents strong periodic pressure pulsations during operation. Such a structure ensures a low-noise and uniform flow.
• Claim 15 relates to the application of an infeed propellor in the medium inlet in the case of a rotation device serving as medium pump.
• the infeed propellor ensures that the medium enters the rotor channels without release at a certain pressure and speed.
• Claim 19 relates to a structure of the rotation device wherein a relatively large number of baffles can be used without the thickness of the baffles at the position of the third medium passage substantially reducing the passage for medium at that position.
• a third group of baffles can also be placed between the interwoven first and second baffles. These baffles are in turn shorter than the second baffles and extend in the direction of the third to the fourth medium passages as far as the fourth medium passage at a distance from the end of the second baffles directed to the third medium passage.
• This structure enables a very good flow guiding without this essentially having an adverse effect on the effective passage of the medium.
• Claims 20 and 21 relate to the form of the stator blades. Since all stator blades are placed in angularly equidistant manner, their mutual distance is always the same in any axial position.
• the use of plate material for manufacture of the dishes and the blades according to claim 22 has the advantage that the rotor can be very light. Plate material can further be very light, smooth and dimensionally reliable. The choice of material will be further determined by considerations of wear-resistance (depending on the medium passing through) , bending stiffness, mechanical strength and the like.
• wear-resistance depending on the medium passing through
• bending stiffness mechanical strength and the like.
• the rotor the dishes of which have the described double- curved form, it is important that the principal form is retained, even when the material is subjected to centrifugal forces as a result of high rotation speeds.
• a rotor can also be manufactured with very high dimensional accuracy and negligible intrinsic imbalance.
• Claims 23, 24 and 25 give options relating to choices of material under specific conditions. Depending on the dimensions of the rotor and the rotation speed, the described plate material can have a desired value. An appropriate choice lies generally in the range stated in claim 26. In respect of the possibility of a small imbalance, the mass moment of inertia of the rotor is preferably as small as possible, particularly in the case of media with low density such as gases. In this context it is recommended to choose the technically smallest possible thickness.
• Claim 27 describes several possible techniques with which the rotor baffles can be coupled to the dishes.
• Claim 28 relates to the possible choices of material for the stator blades.
• the technical considerations forming the basis of this choice are by and large the same as those for the rotor baffles.
• Claim 29 relates to the material choices of or at least the materials on the cylindrical inner surface of the housing and of the stator blades. By making the thermal expansion coefficients of these materials the same as according to claim 29, thermal stresses are avoided and it is ensured that the mutual connection and the correct shape of the stator channels also remain preserved in the case of extreme temperature variations.
• the use of thin sheet material for the blades also has the advantage in this respect that thermal stresses are effectively avoided.
• Claim 30 states as a specific development of the described technical principle the possibility of the materials being the same. It will be apparent that in a further development not only the cylindrical inner surface of the housing must be of the relevant material but this can also be the case for the whole cylindrical jacket of the housing, or even the whole housing.
• Claim 31 focuses on the form of the stator channels. As already described above in respect of claims 23- 26, the mass moment of inertia, and therewith the danger of a certain imbalance of the rotor, is preferably as small as possible.
• Claim 32 relates to this same aspect and applies particularly to gas as medium, which after all makes no appreciable contribution to the mass moment of inertia.
• Claim 36 focuses on a very specific method of forming a rotor.
• the structure according to claim 36 is significant .
• Claim 37 focuses on a very advantageous embodiment wherein an effective sealing is combined with a friction which practically amounts to zero.
• the option according to claim 38 relates to an elegant option of reversing the direction of movement of the output shaft in accordance with the wishes of a user.
• a variant is described in claim 39.
• Claim 40 relates to a specific embodiment of the variant of claim 39. Both said rotors each have a specific direction of movement. The respective output toothed wheels therefore also have their own specific direction of movement.
• a output transmission toothed wheel as according to claim 40 a transmission is formed which has an output shaft which at the choice of the user can have a rotation in the one or in the other direction.
• the rotation device forming the basis of the medium transmission according to the invention can be applied very widely. As pump it displays a very even pressure and efficiency characteristic and a more or less monotonous power characteristic, whereby one pump is suitable for many very varied applications, while in usual pumps different dimensioning is required for different applications .
• the said monotonous, substantially linear characteristics at any rotation speed provides the important option, by means of a very simple adjustment of the driving power, of achieving an output performance corresponding substantially unambiguously therewith.
• the prior art requires for this purpose a complicated and expensive adjustment based on the momentary values of a number of relevant parameters. This is the reason why such adjustments are not applied in practice.
• figure 1 shows partly in cross section and partly in cut away side view a first embodiment of a rotation device
• figure 2 is a partly broken away perspective view of the device of figure 1 which is schematized to illustrate the spatial structure
• figure 3 shows a variant of a manifold
• figure 4 is a partly broken away perspective view of a second embodiment of a rotation device
• figure 5A shows a developed view of a part of a stator with stator blades bounding stator channels
• figure 5B shows a developed view of a stator blade
• figure 5C shows a view corresponding with figure 5A of two stator blades for the purpose of elucidating the geometric proportions
• figure 5D shows a straight-line view of the stator channel according to figure 5C
• figure 5E shows a graph
• Figure 1 shows a rotation device 1.
• This comprises a housing 2 with a central, axial first medium passage 3 and three axial second medium passages 4, 5, 6.
• the device 1 further comprises a shaft 7 which extends in said housing 2 and outside of this housing 2 and which is mounted for rotation relative to housing 2 and supports a rotor 8 accommodated in housing 2, which rotor will be specified hereinbelow.
• Rotor 8 connects with a central third medium passage 9 to the first medium passage 3.
• the third medium passage 9 branches into a plurality of angularly equidistant rotor channels 10 which each extend in a respectively at least more or less radial main plane from the third medium passage 9 to a respective fourth medium passage 11.
• each rotor channel 10 has a generally slight S-shape roughly corresponding with a half-cosine function, and has a middle part 12 which extends in a direction having at least a considerable radial component.
• Each rotor channel has a cross-sectional surface which enlarges from the third medium passage to the fourth medium passage .
• Rotation device 1 further comprises a stator 13 accommodated in housing 2. This stator 13 comprises a first central body 14 and a second central body 23.
• the first central body 14 has on its zone adjoining rotor 8 a cylindrical outer surface 15 which, together with a cylindrical inner surface 16 of housing 2, bounds a generally cylindrical medium passage space 17 with a radial dimension of a maximum of 0.2 times the radius of the cylindrical outer surface 15, in which medium passage space 17 are accommodated a plurality of angularly equidistant stator blades 19 which in pairs bound stator channels 18, and which stator blades 19 each have on their end zone 20 directed toward rotor 8 and forming a fifth medium passage 24 a direction differing substantially, in particular at least 60°, from the axial direction 21, and on their other end zone 22 forming a sixth medium passage 25 a direction differing little, in particular a maximum of 15°, from the axial direction 21, which fifth medium passages 24 connect onto the fourth medium passages 11 and which sixth medium passages 25 connect to the three second medium passages 4, 5, 6.
• the second central body is embodied such that between the sixth medium passage 25 and the second medium passages 4, 5, 6 three manifold channels 26 extend tapering in the direction from the sixth medium passages 25 to the second medium passages 4, 5, 6.
• These manifold channels are also bounded by the outer surface 29 of the second central body 23 and the cylindrical inner surface 16 of housing 2.
• Figure 1 shows a general medium through-flow path 27 with arrows. This path 27 is defined between the first medium passage 3 and the second medium passages 4, 5, 6 through respectively: first medium passage 3, third medium passages 9, rotor channels 10, fourth medium passages 11, stator channels 18, sixth medium passages 25, manifold channels 26, second medium passages 4, 5, 6, with substantially smooth transitions between the said parts.
• FIG 1 the flow of the medium according to arrows 26 is shown in accordance with a pumping action of device 1, for which purpose the shaft 7 is driven rotatingly by motor means (not shown) . If medium under pressure were to be admitted with force via medium passages 4, 5, 6 into the second medium passages 4, 5, 6, the medium flow would then be reversed and the rotor 8 would be driven rotatingly, also while driving shaft 7 rotatably, by the structure of the device 1 to be described hereinbelow.
• the structure of the device is such that during operation there is a mutual force coupling between the rotation of rotor 8, and thus the rotation of the shaft, on the one hand and the speed and pressure in the medium flowing through said medium through-flow path 27.
• the device can therefore generally operate as pump, in which case shaft 7 is driven and the medium is pumped as according to arrows 27, or as turbine/motor, in which case the medium flow is reversed and the medium provides the driving force.
• FIG. 2 shows device 1 in highly schematic cut-away perspective. It will be apparent that manifold channels
• a second central body 23 which can be deemed an insert piece which is situated above the first central body 14 and has three recesses 30 forming the manifold channels 26. These recesses have rounded shapes and connect on their underside to the sixth medium passages 25 for guiding the medium as according to arrows
• Figure 3 shows the insert piece 23 in partly broken away perspective view.
• the insert piece 23 is formed from sheet-metal. It can however also consist of other suitable materials such as solid, optionally reinforced plastic and the like.
• Figure 4 shows a device 31 which corresponds functionally with the device 1.
• Device 31 comprises a drive motor 28.
• an infeed propellor 32 with a plurality of propellor blades 33 is arranged in the third medium passage 9 serving as medium inlet.
• rotor 34 in the device 31 according to figure 4 has a number of additional strengthening shores 35 which are absent in the rotor 8.
• Rotor 8 comprises a plurality of separate components which are mutually integrated in the manner to be described below.
• Rotor 8 comprises a lower dish 36, an upper dish 37, twelve relatively long baffles 38 and twelve relatively short baffles 39 placed interwoven therewith, which in the manner shown form equidistant boundaries of respective rotor channels 10.
• Baffles 38, 39 each have a curved form and edges 40, 41 bent at right angles for medium-tight coupling to dishes 36, 37.
• Baffles 38, 39 are preferably connected to the dishes by welding and thus form an integrated rotor.
• In the central third medium passage 9 is placed infeed propellor 32. This has twelve blades which connect to the long rotor baffles 38 without a rheologically appreciable transition.
• a downward tapering streamlining element 42 is placed in the middle of infeed propellor 32.
• Figure 4 in particular clearly shows the operation of the device 31 operating for instance as liquid pump.
• liquid By driving shaft 7 with co-displacing of rotor 34 liquid is pressed into the rotor channels through the action of propellor 32.
• centrifugal acceleration which occurs, a strong pumping action is obtained which is comparable to that of centrifugal pumps.
• centrifugal pumps operate with fundamentally differently formed rotor channels.
• the liquid flowing out of rotor channels 10 displays a strong rotation and takes the form of an annular flow having both a tangential or rotational direction component and an axial direction component.
• Stator blades 19 remove the rotation component and lead the initially axially introduced flow once again in axial direction inside the manifold channels 26, where the part-flows are collected and supplied to respective medium outlets 4, 5, 6. If desired, the medium can be pumped further via one conduit in the manner shown in figure 2 by means of combining the three outlets 4, 5, 6 into one conduit 43. In anticipation of figure 10 it is noted that other embodiments are also possible, wherein the outlet also extends in practically exactly axial direction.
• Figure 5A shows that stator blades 19 have a bent edge 44 on their infeed side. This edge has a rheological function. It provides a smooth, streamlined transition to the stator channels 18 from the strongly rotating medium flow generated by the rapidly rotating rotor 34.
• FIG. 5A shows in developed form the outer surface 15 of the first central body and the stator blades 19.
• Figure 5B shows a view of a baffle 19 along the broken line B-B in figure 5A.
• Figure 5C shows a set of stator blades 19 together bounding a set of stator channels 18.
• Figure 5D shows a working drawing of channel 18 with the definition of the mutual angles in accordance with the successive lines 46 which, as figure 5D shows, all have mutual distances along the axis of about 5 mm, in this embodiment at least.
• the outlet width of each stator channel is about 15 mm, as shown in figure 5C.
• Figure 5D shows the different positions with the associated half angles between the blades 19 at the positions indicated.
• Figure 5E shows the channel width as a function of the positions as according to figures 5C and 5D.
• Figure 5F shows the enclosed angle as according to the view in figure 5D. It is important to note that this angle nowhere exceeds the rheologically significant value of about 15° and even remains under the value of 14°.
• the respective rotors 8, 34 in the region of the third medium passage and the fourth medium passage are sealed relative to housing 2 by respective labyrinth seals 45, 46.
• the shaft is mounted relative to the housing by means of at least two bearings, only one of which is drawn in figures 1 and 4. This bearing is designated with reference numeral 47.
• Figure 6A shows a rotation device with a slightly different structure.
• This structure involves a continuous unit of manifold channels since there is a space 49 which is bounded by a second central body 50 together with the wall 51 of housing 52. There is therefore only one medium outlet 4.
• Figure 6B shows a rotation device 48', the structure of which corresponds practically wholly with the structure of device 48 according to figure 6A.
• device 48' comprises an electric motor. This comprises a number of stator windings designated with reference numeral 90 which are arranged in stationary position, and a rotor anchor 91 fixedly connected to upper dish 37 of rotor 8.
• the connecting wires of the stator windings are not drawn. They can very suitably extend upward via the unused space inside stator blades 19 and exit device 48' at a desired suitable position.
• Figure 7 shows the internal structure of rotor 8 with omission of the lower dish 36.
• Particularly important in this figure is the structure of the second central body 53. Comparison with figure 2 in particular will make clear how this embodiment differs from the structure of device 1.
• the second central body 53 is provided with three insert pieces 54 bounding recesses 55 which connect the outlet openings of stator channels 18 to medium outlets 4, 5, 6.
• Recesses 55 are provided with flow guiding baffles which, although they have different shapes, are all designated with the reference numeral 56 for the sake of convenience. A very calm, turbulence-free flow is likewise realized due to this structure.
• Figure 8 shows the stator 57 according to figure 7 from the other side.
• FIG 10A shows a part of a fifth embodiment.
• Stator 61 is constructed to a large extent regularly and symmetrically and differs in this sense from the embodiments shown particularly clearly in figures 2 and 7.
• manifold channels 62 are formed in analogous manner on stator channels 18.
• Manifold channels 62 are bounded on one side by a surface 63 of a second central body 64 tapering in the direction of outlet 4 and on the other side by the inner surface of a housing (not drawn) .
• Channels 62 are mutually separated by dividing walls 65. As shown, about 2.7 stator channels are combined on average to form one manifold channel 62.
• Figure 10B shows a variant of figure 10A.
• Stator 61' according to figure 10B differs from the embodiment of figure 10A to the extent that channels 62' are mutually separated by a surface 63' and baffles 65' with shapes differing from the relevant components in stator 61.
• the consequence hereof is that the medium passage 93 ' according to figure 10B has a larger passage than medium passage 93 in figure 10A.
• the difference in speed over channels 62' is therefore smaller than the difference in speed over channels 62. This may be desirable in some conditions.
• FIG 10C shows a further variant in which stator 61" comprises not only the relatively long baffles 19 but also shorter baffles 19' placed interwoven therewith.
• stator 61" otherwise substantially corresponds with stator 61'. It is pointed out that the lower end zones of baffles 19 and 19 ' are folded over. A good streamline form with increased stiffness, strength and erosion-resistance is hereby ensured.
• Figure 10D shows the tangential distance between the adjacent baffles 19 and 19' according to figure IOC and the baffles 19 according to figures 10A and 10B.
• the tangential distance is shown as a function of the axial position.
• Curves I and II correspond to adjacent baffles.
• Figure 10E relates to the embodiment of figure IOC.
• the graph shows the channel width as a function of the channel position. The influence of the interwoven placing of relatively long and relatively short baffles is apparent. This influence is recognizable from the jump in the graph. If this jump were not present, the part designated II would then connect smoothly onto the part designated I, whereby the channel width in region II would become substantially larger. This would have a considerable effect on the elongate character of the stator channels, and thereby affect the performance of the device in question.
• Figure 10F shows the enclosed angle as a function of the channel position.
• a comparison with figure 5F shows that through the choice of interwoven placing of short and long baffles the enclosed angle, which in figure 5F amounts to almost 14°, is always smaller than 10° in the structure according to figure IOC.
• FIG 11 shows a sixth embodiment.
• the rotation device 66 comprises a rotor 67 with a plurality of rotor channels 68 which are bounded by sheet-metal walls.
• This rotor can be formed by explosive deformation, by means of internal medium pressure, by means of a rubber press or other suitable known techniques.
• Manifold channels 69 are bounded by baffles 70 extending roughly helically in the drawn area .
• Figure 12 shows the manner in which the spatially very complicated form of the stator blades 19 can be manufactured from respective strips of stainless steel.
• Figure 12A shows very schematically a mould 71 for forming a stator blade 19 from a flat strip of steel of determined length.
• the mould comprises two mould parts 72, 73 which are rotatable with force relative to each other and which in a closed rotation position have two mutually facing separating surfaces, the shapes of which are substantially identical, which shapes correspond with the shape of a blade 19.
• the separating surface in question is situated at the position designated 74 where such a blade 19 is drawn in accordance with the reality during forming of a blade, wherein the adjoining parts of mould parts 72, 73 are drawn in broken away view.
• mould part 73 has on its underside adjoining support cylinder 77 a recess 78 corresponding with the bent lower edge 79 of strip 19, while a similar recess 80 remains present on the top side between the upper surface of mould part 72 and mould part 73 when the mould cavity is closed.
• the final closure of the mould cavity is determined exclusively by the thickness of the metal of blade 19.
• Recess 80 corresponds with the upper bent edge 81.
• FIGS 12C and 12D show an alternative device or mould 871 for forming a stator blade 819 from a flat strip of steel 801 with the curved form of determined length shown in figure 12D.
• Mould 871 comprises two mould parts 872, 873 which are rotatable with force relative to each other and which in a closed rotation position have two mutually facing separating surfaces, the shapes of which are substantially identical, which shapes correspond with the shape of a blade 819.
• the mutual rotation of said mould parts 872, 873 can take place by rotating mould part 873 by means of handle 802, wherein mould part 872 remains stationary because it is formed integrally with a frame 803 which is fixed to a work surface.
• a second handle 804 is fixed to a substantially cylindrical element 805 provided with a more or less triangular opening 806 which serves for placing of strip 801 and removal of a formed blade 819.
• the respective components 805 and 814 are mutually coupled for rotation by means of a key 808 fitting into a key way 807.
• Said separating surfaces 810, 811 serve to impart to strip 801 the double curved principal shape, although without the bent edges 812, 813 which serve for connection of a blade deformation of a stator to respective cylindrical bodies.
• the bent edges 812, 813 can be formed by a further rotation by handle 804.
• the intended bending of said edges takes place due to rotation of central part 814 which, as stated, is coupled for rotation to element 805 and is provided with a bending edge 815.
• a second bending edge 816 is arranged on the inside of element 805.
• a very accurate and chip- and burr-free sheet- metal element can hereby be obtained which is free of internal stresses.
• the narrowed end zone 820 can be folded over as according to arrow 823 to the position designated with 820'.
• Blade 819 is thereby ready to serve as component of a stator.
• a stator is shown for instance in figure 13C.
• Figure 13A shows a possible and very practical method of manufacturing rotor 8.
• the starting point is lower dish 36, upper dish 37 and the rotor baffles 38, 39 for placing therebetween and connecting fixedly thereto (see also figure 9) .
• Corresponding zones 87 are arranged in lower electrode 84. During transmitting of a sufficiently large current, a large current will be conducted through the relevant current path via the pressing zones 86, 87, which are in register with baffles 38, 39. An effective spot welding of baffles 38, 39 to dishes 36, 37 hereby takes place.
• the for instance copper blocks 82 are essential for a good electrical conduction without adverse thermal effects on baffles 38, 39.
• the relevant chains of blocks can be removed by pulling on wires 83. After this operation the rotor is in principle finished.
• a fixing disc 90 can also be welded to upper dish 37 and with cover 91 this forms the fixing of the rotor to shaft 7.
• FIG. 13B shows in greatly simplified manner and with the omission of a number of components an arrangement 830 for manufacturing a stator 831 as shown in figure 13C.
• Stator 831 comprises a cylindrical inner wall 832 and a cylindrical outer wall 833. In this embodiment these walls are made of stainless steel. Outer wall 833 is relatively thick, while inner wall 832 is relatively thin.
• stator blades 819 (see figure 12) of relatively great length and the blades 819' of shorter length placed interwoven therewith are placed in the desired position and fixed with the bent edges 812 and 813 to respectively inner wall 832 and outer wall 833 by welding. It will hereby be apparent that the shapes of these bent edges 812 and 813 must fit precisely onto the relevant cylindrical surfaces.
• the devices shown in figure 12 are specially designed herefor.
• Figure 13B shows, with the omission of cylinders 832, 833, an arrangement of equidistantly placed chains of copper blocks, which for the sake of convenience are all designated 834 and which take the form shown in figure 13D corresponding with the form of blades 819 respectively 819'.
• the blocks are mechanically connected to each other and electrically separated from each other by means of a lace 835.
• a rubber cushion 836 has a form such that the total structure 837, consisting of blocks 834, lace 835 and cushion 836, fits precisely between blades 819, 819' of a stator 831.
• Blocks 834 have a general U-shape.
• edges 812, 813 can hereby be mutually connected for electrical conduction and thermal conduction without the electrical conduction taking place via the middle plate of a blade 819.
• Comparison of figures 13B and 13C shows the relative placing of blocks 834 and blades 819, 819'.
• FIG. 13B is drawn in simplified manner in the sense that only the foremost group of chains 837 is shown, while the cylindrical jackets 832, 833 have also been omitted for the sake of clarity.
• An outer electrode 838 is placed outside outer jacket 833, while an inner electrode 839 is placed inside inner jacket 832.
• These electrodes are adapted to simultaneously transmit currents through spot-welding zones, which for the sake of convenience are all designated 840.
• electrodes 838, 839 are connected to a power source 841.
• Figure 14 shows a graphic representation of the efficiency "EFF" expressed in a percentage as a function of the relative flow rate Q of respectively a device according to the prior art (graph I) and as measured on a device of the above described type according to figure 1 (graph II) and, finally, as according to figures 7, 8, 9, 10.
• Figure 15 likewise shows the performance of a device according to the invention operating as a pump.
• the graphs shown in figure 15 relate to the pump pressure as a function of the flow rate of a device according to the invention compared to an eight-stage standard centrifugal pump with a dimensioning comparable to the device according to the invention.
• the graph I indicated with circular measurement points relates to the measurement on a known pump NOVA PS 1874.
• the other graphs relate to measurements on a pump according to the invention at the following rotation speeds of respectively: 1500, 3000, 4000, 5000, 5500, 6000 revolutions per minute.
• Figure 16 shows measurement results in a comparison between two types of pump according to the invention and two types of pump according to the prior art.
• Graphs I and II relate to an eight-stage centrifugal pump of usual type at 3000 revolutions per minute.
• Graph I relates to an inlet of 58 mm while graph II relates to an inlet of 80 mm.
• the drawn graphs with the indications of respectively 1500, 3000, 4000, 5000, 6000 revolutions per minute relate to a one-stage device according to the invention with a housing of 170 mm diameter, a rotor diameter of 152 mm and an inlet diameter of 38 mm.
• the graphs drawn in dashed lines likewise relate to a one- stage device according to the invention with a housing having a diameter of 170 mm, a rotor diameter of 155 mm and an inlet diameter of 60 mm.
• the respective lines III and IV designate the respective cavitation boundaries of the first type of pump according to the invention as described and the second type of pump according to the invention as described.
• FIG 17 shows a unit 901 comprising a rotation device 902 and a motor 903. The unit is designed to operate as a pump. On the underside is situated a first medium passage 904 serving as inlet and on the side is situated the second medium passage 905 serving as outlet.
• Figure 18 shows schematically the structure of unit 901.
• unit 901 is constructed from two separate components.
• motor shaft 906 has an end tapering towards the outside with a conical screw thread 907 on the end, while rotor shaft 908 has a corresponding complementary form.
• motor 903 and pump 902 are mutually coupled in releasable and power-transmitting manner, while a very easy release is nevertheless ensured.
• Figure 19 shows in exploded view the manner in which the constituent main components are mutually connected and interrelated. It is important to note that upper component 909 of pump 902, in which the stator is situated, is constructed differently from the relevant components in the above described and shown embodiments. Rotor 910 and inlet components 911 correspond with the above described embodiments.
• Figure 20 shows motor 903 with a coupling piece 912 on the underside for coupling to a corresponding coupling sleeve 913 on outlet component 909.
• FIGs 21 and 22 show a component 914 of outlet component 909.
• Component 914 comprises a sheet-metal funnel 915 with a central opening 916.
• Arranged against the wall in funnel 915 are flow guiding baffles which are ordered in the manner shown in figures 21, 22 and which, although they possess different forms, are all designated for convenience with the reference numeral 917.
• Baffles 917 are members of one parametric family.
• Flow guiding baffles 917 can be made in a manner which is related to the manner in which the stator blades and/or the rotor baffles can be made. Reference is made to figures 12 and 13 in respect of possible manufacturing methods.
• unit 901 requires no further discussion. Both structure and operation will be apparent from the discussion of the foregoing embodiments.
• Flow guiding channels 919 correspond functionally with manifold channels 62 and 62' of respectively figures 10A and 10B.
• the structure of unit 903 is such that outlet 905 extends on the side of unit 903. This simplifies the structure of the critical coupling between motor 903 and pump 902. It is however noted that in this respect the embodiment according to for instance figures 1, 2 and 4 could also be applied.
• Figure 23A shows a rotating medium transmission (301) comprising an input shaft (302) drivable by motor means (not drawn) and an output shaft (303) , in addition to transmission means to be described hereinbelow for increasing the pressure in a medium flow (304) and driving with this medium flow at increased pressure a turbine (305) which comprises a rotor (306) which is connected to output shaft (303) .
• the rotor (306) delivers via its third medium passage (307) a medium flow (308) to a bypass line (309) provided with two choke valves (310,311).
• the other end (312) of the line (309) debouches in the third medium passage (313) of a second rotation device (314) operating as pump, the rotor (315) of which is driven via input shaft (302) .
• each of the rotation devices corresponds with the descriptions given above. These descriptions will not be repeated here.
• the distributed manifold channels (316,317) of the respective devices (314, 305) are mutually connected via an annular connecting channel (318) .
• the flow (304) extends through this connecting channel .
• An infeed propeller (321) is added to the third medium passage (313) .
• the flow rate of the medium flow (322) through line (309) can be controlled.
• This medium flow determines the transmission to the output shaft (303) of the input power available to shaft (302) .
• Figure 23B shows a medium transmission (301') partly corresponding to the transmission (301) of figure 17A. It differs therefrom however in two respects, i.e. the fact that the device (301') comprises provisions whereby the rotation direction of output shaft (303) can be reversed and secondly in that a buffer volume is incorporated in the bypass line to be described below.
• the transmission (301') comprises an input shaft (302) drivable by motor means (not drawn) and an output shaft (303) , in addition to transmission means to be described hereinbelow for increasing the pressure in the medium flow (304) and driving with this medium flow at increased pressure a turbine (305') which comprises two rotors (306'), (307') which can be selectively connected to output shaft (331).
• the rotors (306'), (307') deliver via their third medium passages (306"), (307") (to be described below) a medium flow (308) to a bypass line (309') containing a choke valve (310).
• a buffer volume (327) which in turns connects onto a second part (309") of the bypass line in which is arranged a second choke valve (311).
• the other end (312) of the line (309') debouches in the third medium passage (313) of a second rotation device (314) operating as pump, the rotor (315) of which is driven via input shaft (302) .
• the basic structure of each of the rotation devices corresponds with the description given above. Reference is also made to figure 17A.
• the distributed manifold channels (316'), (317') of respective devices (314, 305') are mutually connected via an annular connecting channel (318') .
• the flow (304) extends through this connecting channel.
• An infeed propeller (321) is added to the third medium passage (313) .
• the stator (323) of the downstream device (305') comprises two stator parts which are slightly displaced in axial direction and placed in substantially mutually coaxial relation.
• the respective blades of these part- stators (324) , (325) have, as shown, mutually opposed orientations.
• a valve (326) serves to guide the medium flow (304) as desired through part-stator (324) or part- stator (325) .
• the valve means (326) according to figure 17B are adapted for selectively releasing or blocking the respective inlets of part-stators (324) , (325) .
• the annular valve bodies (328) , (329) are slidable in axial direction for this purpose.
• toothed wheel (330) can be selectively connected to toothed wheel (341) or toothed wheel (342) . Since the rotors (306* ), (307') each have their own rotation direction, which is in any case related to the orientation of the respective stators (325) , (324) , the rotation direction of output shaft (331) can be changed in the indicated manner.
• the operating device (343) can be operated externally.
• synchronization means for temporary synchronization of the rotations of toothed wheels (341) , (342) during switching of toothed wheel (330) between both said toothed wheels.
• Such synchronization means are per se generally known, for instance from the art of gearboxes in automobiles.
• a very simple embodiment consists of a free-turning rubber roller being pressed for a short time against both toothed wheels (341) , (342) .
• the non-driven toothed wheel is hereby urged into a rotation at the same speed as the toothed wheel which is driven.
• Choke valves (310) , (311) can be controlled from respective sensor devices (332) , (333) which monitor the rotation speeds of the shafts (303), (331) and (302).

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)

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Citations (3)

• 1998
  • 1998-07-28 NL NL1009757A patent/NL1009757C2/nl not_active IP Right Cessation
• 1999
  • 1999-07-28 WO PCT/EP1999/005495 patent/WO2000006909A1/en active Application Filing
  • 1999-07-28 AU AU53727/99A patent/AU5372799A/en not_active Abandoned

Patent Citations (3)

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