WO2016116088A2

WO2016116088A2 - Rotational inhibitor, in particular for a rotational flow in the can base region of a magnetic drive pump

Info

Publication number: WO2016116088A2
Application number: PCT/DE2016/000001
Authority: WO
Inventors: Günther Schneider; Christian JUSSEN
Original assignee: Ruhrpumpen Gmbh
Priority date: 2015-01-22
Filing date: 2016-01-04
Publication date: 2016-07-28
Also published as: WO2016116088A3; DE102015000634B3

Abstract

The invention relates to a magnetic drive pump (1) having a shaft (2) with a shaft through-bore (15), the magnetic drive pump (1) having an inner rotor (9) and an outer rotor (11), both rotors carrying magnets, between which a can (12) with a can base (13) is arranged, said can being subjected to pressure by a medium to be pumped. According to the invention, a rotational inhibitor/vortex inhibitor (16) is arranged in the shaft through-bore (15) and non-rotatably connected to the latter, such that the medium to be pumped is diverted, in its direction of movement, in the region of the can base (13) in a specific manner towards an inlet (17) of the shaft through-bore (15). A rotational inhibitor (31) is also arranged on the can base (13), the central axis (X) of a main body (32) of the rotational inhibitor (31) being congruent with the central axis (X1) of the shaft through-bore (15). At least one inlet opening is arranged in a wall (33) of the main body (32) and at least one blade (34) is arranged and designed on the main body (32) such that the medium to be pumped is diverted, in its direction of movement, in the region of the can base (13) in a specific manner towards an inlet (17) of the shaft through-bore (15).

Description

Rotary lock, in particular for a rotational flow in the gap pot bottom region of a magnetic coupling pump

The invention relates to a magnetic coupling pump, comprising a shaft with a through hole, wherein the magnetic coupling pump has an inner rotor and an outer rotor, each carrying magnets between which a pressurized medium with pressure medium is arranged, which has a split pot bottom. Such conveying elements in the exemplary embodiment as magnetic coupling pumps are well known, and described for example in DE 10 2009 022 916 A1. In this case, the pump power is transmitted from a drive shaft via a magnet-bearing rotor (outer rotor) without contact and essentially without slippage to the pump-side magnet carrier (inner rotor, first drive element). The inner rotor drives the pump shaft, which is mounted in a slide bearing lubricated by the fluid, so in a hydrodynamic sliding bearing. Between the outer rotor and the inner rotor, so between the outer and the inner magnet is a containment shell with its cylindrical wall. The containment shell is connected with its flange to a pump component, for example a housing cover, and has a closed bottom, ie the containment pot bottom, opposite thereto. The containment shell, so the magnetic coupling pump reliably separates the product space from the environment, so that the risk of product leakage can be excluded with all the associated negative consequences. A magnetic coupling pump is therefore the combination of a conventional pump hydraulics with a magnetic drive system. This system uses the attraction and repulsion forces between magnets in both coupling halves for non-contact and slipless torque transmission. Especially when dealing with very valuable or very dangerous substances, the magnetic drive pump therefore has great advantages. From DE 10 2011 117 183 A1, a magnetic coupling pump is known, the pump shaft has a through hole through which the fluid contained in the gap pot is returned to the suction of the pump. DE 36 12 802 C2 deals with a permanent magnet pump, consisting of a centrifugal or positive displacement pump with a rotor of a permanent magnet coupling and a drive motor. The permanent magnets of the

Confirmation copy) connected to the drive motor outer rotor act through the containment shell on the permanent magnets of the pump rotor connected to the inner rotor. In DE 36 12 802 C2, the containment shell consists of an electrically poorly conducting material, the interior of which is wetted with the delivery liquid and pressurized. In order to make the containment shell in the first place stiffer and more dimensionally stable, DE 36 12 802 C2 proposes that the inside of the containment pot bottom is provided with at least one radially extending stiffening web or one radially extending stiffening rib.

In operation of the magnetic coupling pump, a rotational flow of the pumped medium within the fixed split pot, which is generated by the rotating inner rotor and kept in motion. This rotational flow is not harmful. Nevertheless, a trombone will form. However, if the pumped medium contains solids, ie abrasive particles, they can abrade the containment shell, in particular the containment pot bottom, by the action of rotation, thus damaging it. The rotational flow is such that in the zenith of the split pot bottom, the abrasive effect of the particles is concentrated by concentrating them on a Abrasionsbereich. In the worst case, even a hole in the split pot bottom could be caused solely by the abrasive action of the particles in conjunction with the rotational flow of the pumped medium, so that the In this respect, the safety of the magnetic drive pump with all negative effects on the environment and human health would no longer be guaranteed.

Only marginally mentioned in DE 36 12 802 C2 that their stiffening webs could serve as a rotation brake or rotation lock held by the inner rotor in constant rotation flow of the fluid. The stiffening webs would form pockets in which the abrasive particles could be deposited, so that they would be prevented from destroying grinding work. At most, it would lead to a removal of the stiffening webs, which could be tolerated to a certain extent, the safety of the pump would be guaranteed in any case. In DE 36 12 802 C2, it is not mentioned that the abrasive effect of the particles or solids contained in the pumped medium could be displaced by the stiffening webs from the zenith of the split pot bottom in the direction of its cylindrical walls, so that in a transition of the split pot bottom to the cylindrical walls nevertheless have a grinding effect due to the abrasion could occur. However, security could be jeopardized if a hole in this area were created, which is quite conceivable. Another disadvantage of the stiffening webs according to DE 36 12 802 C2 is the fact that with the stiffening webs quasi a flow obstacle is installed within the containment shell, in particular in Spalt pot bottom area, wherein the flow obstacle of course performance-reducing (overall efficiency) will affect the permanent magnet pump. Another disadvantage is that the stiffening webs can cause an axial thrust of the pumped medium in the direction of the suction side of the permanent magnet pump, whereby the performance characteristics could also be adversely affected. In such a case, the conveyed medium heated by the magnetic power loss could be pressed counter to the actually provided (forced) flow direction against the impeller-remote thrust bearing element, so that the respective axialschubbelastete thrust bearing element would be lubricated with already heated Teilfördermediumstrom, leading in the worst case to a bearing damage can. In this respect, the construction of magnetic drive pumps still offers room for improvement.

The invention has for its object to improve a magnetic coupling pump of the type mentioned by simple means or to create, their operational safety is also ensured if abrasive substances are contained in the fluid.

According to the invention the object is achieved by a magnetic coupling pump with the features of claim 1. But the solution of the problem is also possible with a magnetic drive pump with the features of claim 7.

It should be noted that the features listed individually in the claims, in any technically meaningful way can be combined and show other embodiments of the invention. The description additionally characterizes and specifies the invention, in particular in connection with the figures.

[0009] According to the invention, a magnetic coupling pump or canned motor pump is proposed, in which a rotation lock is arranged in the shaft passage bore of the shaft, the rotation lock being non-rotatably connected to the shaft in its shaft passage bore. With the invention it is achieved, inter alia, that a suction flow is generated within the region of the split pot bottom conveying medium in the direction of entry of the shaft passage bore so that the containment shell, in particular its containment bottom remains free of negative influences of abrasive particles. The rotational flow of the pumped medium is not interrupted. Rather, the fluid, and thus the particles therein are selectively deflected in their direction of movement, and indeed purposeful towards the entrance of the shaft bore. In this respect, the rotation lock according to the invention is not to be understood as a mechanical rotation lock. Rather, the rotation barrier in the sense of the invention is a device with which a targeted delivery medium or fluid flow is deflected within the containment shell, ie in the can end region in the direction of entry of the shaft passage bore, without the direction of movement of the fluid or fluid is interrupted. In this respect, the rotation lock can also be referred to as Trombenverhinderer.

In an advantageous embodiment, the rotation lock has at least one blade-like plate (rotor), which is hereinafter referred to for simplicity as a blade (rotor). The blade is arranged in a design possibility on a base body, so that the rotation barrier is formed from the base body and the at least one blade.

[0013] In a preferred embodiment, the main body is cylindrical. In another embodiment, the base body can also be designed conical, wherein the configuration of the main body or the rotation lock depends on the execution of the entry of the shaft passage bore or the execution of the shaft passage bore. It is also possible that the rotation lock has two, three, four or more blades. The blade can in its course from a foot to free edges both in the radial direction and in the circumferential direction of the shaft through hole, so also seen both in the radial direction and in the circumferential direction of the body rectilinear, or in a preferred embodiment have a curve-like course. In addition, the blade can be profiled. A profiling according to the invention is also present when the at least one blade has two free edges. One of the free edges, that is to say the radial edge, can run in a straight line in a purposeful manner, the other free edge, that is to say the circumference. Curb is curved. In this case, one of the free edges, that is to say the radial edge, is virtually parallel to the radius of the base body, wherein the other free edge, ie the peripheral edge with its curved course, adjoins the curvature of the cylindrical base body, ie the curvature of the inner wall of the base body (inner circumference). can be adjusted. It is also objective if the at least one blade with at least one of its free edges is arranged at an angle relative to a central axis of the shaft passage bore. In addition, the blade has a foot end (attachment edge), with which this can be in rotationally fixed contact with a web of the body.

The configuration of the at least one blade is ideally such that the suction flow is generated in the direction of the entrance of the shaft bore, so that the fluid, and thus the particles therein are selectively deflected in their direction of movement in the gap pot bottom.

The rotation lock may have a arranged in its base body spiral instead of the blade, so that even so the suction flow towards the entrance of the shaft bore can be generated, so also that the fluid is deflected targeted in its direction of movement in the gap pot bottom.

[0017] In an ideal embodiment, the rotation lock separate from the shaft is produced with its base body and the at least one blade arranged thereon in one piece or preferably in one piece. Integral within the meaning of the invention means that first the cylindrical base body is produced, wherein the at least one blade with its web on which the foot end, so the fastening edge of the blade is arranged, is attached to the base body. One-piece in the sense of the invention means that the base body is manufactured together with the at least one blade from a common component.

Each rotation lock is individually adaptable to the respective magnetic coupling pump. In particular, the outer diameter of the base body, and the optionally tapered outer diameter is adaptable to the inner diameter of the shaft passage bore, or to the configuration of the entrance of the shaft passage bore. Thus, the outer periphery of the rotation lock is preferably without gaps on the inner circumference of the Wellenendurchgangsboh- tion or on the inner circumference of the entrance of the shaft passage bore. This allows loss of flow to be avoided.

As already mentioned, at least one blade or several blades can be provided. In particular, the shaft speed is used to set the number of blades. Thus, a necessary number of blades may decrease with increasing shaft speed. Thus, if a shaft had a speed of less than 1750 rpm, the rotation lock, that is to say the anti-thrust device, could have four blades. Would the shaft have a speed of more than 3000U / min, the rotation lock, so the Trombenverhinderer could have two blades, even a blade may be sufficient to generate the suction flow toward the entrance of the shaft bore, so the medium in his Direction of movement, that is to redirect the particles located in the pumped medium in the area of the split pot bottom.

It is within the meaning of the invention if the pressure within the shaft passage bore is increased due to the rotation lock, that is, due to the anti-thrust device downstream thereof. However, this is not harmful, but rather has a performance-increasing effect on the magnetic coupling pump, with an axial thrust load of the impeller-remote thrust bearing element is avoided with the invention. According to this, a higher power can be achieved with the invention with the same expenditure of energy, since the pressure in the shaft through-bore is increased by the rotation lock rotating in the direction of rotation of the shaft (anti-trumpet prevention device) without additional energy being expended. Nevertheless, the profiling of the at least one blade, and thus also its angular position in conjunction with the existing rotational speed of the shaft, can be adapted in accordance with the desired pressure conditions in the shaft passage bore. Depending on the angle which the blade or the blades have, more or less fluid is conveyed through the shaft through hole in the direction of an impeller arranged thereon. It is expedient if the desired angle is selected depending on the rotational speed of the shaft and the required partial flow in dependence on the liquid to be pumped.

Favorable in the context of the invention is when the rotation lock is rotatably connected as a separate element connected to the shaft. For non-rotatable connection of the rotary tion barrier with an inner wall of the shaft passage bore may be provided a non-positive connection in which, for example, a grub screw in a corresponding threaded bore of the shaft is introduced so that the rotation lock is held by the grub screw position stable in the Wellendurchgangsboh- tion. But it is also possible if the rotation lock is materially connected to the shaft passage bore, wherein a welded joint, even a frontal spot weld for rotationally fixed positioning can be sufficient. As a cohesive connection and an adhesive bond may be possible, wherein the rotation lock can be glued to the shaft passage bore. Of course, an adhesive would have to be selected, which withstands the stresses of the sometimes chemically very aggressive pumped medium. Another way to connect the rotation lock to the shaft passage bore can be seen in a shrink fit or press fit. Which of the not conclusively mentioned connection options is selected, is incumbent on the skilled person, ideally a rotatable connection will be generated, so that the rotation lock rotates together with the shaft in the direction of rotation, the positionally secure positioning of the rotation lock in the shaft passage hole is targeted. In a preferred embodiment, a compound can be selected, in which a release of the connection without destruction of at least the shaft and the rotation lock will be ensured. In the release of the connection destroying the rotation lock could be taken into account, as this is very simple and inexpensive replaceable as a separate component.

[0023] It is of course also possible if the at least one blade or spiral forms the rotation lock itself, wherein a base body could be dispensed with if the at least one blade or spiral rotates in a suitable manner and if possible also removably in the shaft bore or in the ren inlet area is fastened. Here is also a screw, even a connection with said grub screw conceivable. Of course, the at least one blade or the spiral can also be cohesively connectable to the shaft, it being understood that more than one blade in the shaft passage bore can be rotatably attached.

The rotation lock has in a preferred embodiment, the same material as the shaft, but of course, another material for the rotation lock is selected if this meets the requirements of the pumped medium and the Shaft material in its property does not adversely affect. The rotation lock can for example be made of a stainless steel (eg 1.4571), a light metal (eg aluminum) or a plastic. Of course, it is also possible if the rotation lock is made of different materials, but then only a one-piece production is possible.

In an advantageous embodiment, the rotation lock can be introduced into the shaft passage bore that their free end faces, so the free end face of the entrance of the shaft passage bore or the free end face of the shaft passage bore and the free end face of the rotation lock, or the body flush with each other. In this case, the rotation lock is introduced with its insertion end first in the shaft passage bore, so that the free end face or end face is preferably flush with the free end face of the shaft passage bore. Of course, the rotation lock with its free end face the free end face of the entrance of the shaft passage bore also project beyond the outside or be offset inwards.

In a preferred embodiment, the rotation lock is arranged in the shaft passage bore, that the at least one blade is arranged directly at the entrance of the shaft passage bore, and extends within the body towards the insertion of the rotation lock, ie in the direction of the impeller. The rotation lock is purposeful with its central axis congruent to the central axis of the shaft passage bore, so also coincident to the central axis of the magnetic coupling pump.

In a preferred embodiment, the rotation lock at its free end face on at least one web on which the at least one blade with its foot end (mounting edge) is arranged. The web extends in the radial direction from an inner wall of the base body in the direction of the central axis of the base body. The blade is arranged with its foot end (attachment edge) on the web, wherein the one free edge, so the radial edge is rectilinearly bent away from the web from the free end face towards the insertion side away. The other free edge of the blade, ie the peripheral edge, is bent away from the inner wall in the same direction. So a profiled blade is formed. The radial edge and the peripheral edge form at their merger a tip which is oriented to the insertion side. In this case, the blade with its free airfoil thus formed can have an angle of 0 to 90 ° relative to the plane of the free end face. If two blades are used see, these also each have a web, which in a favorable embodiment in the radial direction join each other, wherein the two blades are profiled as previously oriented. If four blades are provided, they likewise each have a web which virtually quadruples the free end surface, with the respective blade being bent as described above. Three bars would therefore third the free face.

If the rotation lock is made in one piece, an insert which has the one, the two, the three or the four webs or more webs, inserted into the body and connected thereto in a stable position, wherein on the webs in each case the blade are formed , The unit thus formed is introduced into the shaft through hole with the insertion side ahead and fixed in rotation. If the rotation lock is made in one piece, the cylindrical base body is made together with a bottom, which is arranged opposite to the insertion on the future free end face. From the bottom, the at least one blade is then cut out so that it is fixed with its foot end to the remaining web, wherein the radial edge and the peripheral edge are cut free, and the common tip extends in the direction of the insertion side. For two, three or four blades, the procedure is appropriate. The unit thus formed is inserted into the shaft through hole with the insertion side in advance and fixed against rotation. In a preferred embodiment, a one-piece rotation lock can be selected for use in the shaft passage bore. It is also possible that the blades are opposite, so extend away from the free end face toward the split pot bottom. In a further possible embodiment, it is proposed that the rotation lock is arranged on the split pot bottom so that a base body with its central axis is congruent to the central axis of the shaft passage bore, wherein in the wall of the base body at least one inlet opening is arranged, and wherein on the base body at least one blade is arranged and executed such that the conveying medium in its direction of movement, that is to say the particles located in the conveying medium, is deflected in the direction of the shaft passage bore in the region of the split pot bottom in a targeted manner. In this embodiment, the rotation lock does not rotate in contrast to the previously described embodiment with the shaft, since the rotation lock arranged on the fixed gap pot bottom, that is fixed. Nevertheless, the conveying medium, that is to say the particles contained therein, is deflected in the direction of the shaft through-bore in a targeted manner by the rotation lock, that is to say by the interaction of the base body, its inlet opening, the configuration of the blade and the movement of the conveying medium in the region of the split pot bottom. It is expedient if the main body has a plurality of inlet openings, wherein two, three or four or more inlet openings can be provided.

It is expedient if the base body has a cylindrical configuration and is arranged in a stable position with its fastening end on the split-pot bottom. At the opposite end of the mounting end free end, the at least one blade is arranged in a favorable embodiment, which extends as before from the end face in the direction of the attachment side. However, it is also possible if the at least one blade extends in a direction opposite to the entrance of the shaft passage bore in a direction oppositely directed both from the free end side and from the fastening side.

The at least one inlet opening can be arranged as an opening, which can also be referred to as a slot in the wall of the base body, which ends in a possible embodiment in each case before the attachment end and the free end face. It is also possible if the breakthrough is guided to the attachment side, so that virtually a closed to the free end side slot is formed. In a further possible embodiment, the inlet opening can be arranged as a breakthrough in the wall of the base body, which extends spaced to the two sides (attachment end and front side) extending parallel to these. Thus, distributed over the circumference of the wall can be provided a plurality of inlet openings. The inlet openings can be designed as a breakthrough based on the two sides (mounting end and front side) also inclined, so not only perpendicular or horizontal to run, but be arranged obliquely in the wall. Here, as before, a course to mounting side is conceivable, in which case an oblique, closed to the free end side slot is formed. Of course, the inlet opening can be any other suitable geometric Have shape. For example, the inlet opening could also be designed as a round hole.

Also with this possible embodiment, when the rotation lock is arranged on the split pot bottom, it is achieved, inter alia, that a suction flow is generated within the region of the split pot bottom conveying medium or fluid in the direction of entry of the shaft bore, so that the containment shell, In particular, its can bottom remains free of negative influences of abrasive particles. The rotational flow of the pumped medium is not interrupted. Rather, the fluid, and thus the particles therein are selectively deflected in their direction of movement, and indeed purposeful towards the entrance of the shaft bore.

Of course, a rotation lock could also be arranged as described above in the shaft passage bore. In this respect, it is possible with the invention to arrange the rotation lock either in the shaft passage bore or on the split pot bottom, wherein in each case a rotation lock can also be arranged both in the shaft through hole and on the split pot bottom.

Each rotation lock can be tailored for the respective magnetic coupling pump produced. However, if the magnetic drive pump is operated with other operating parameters, it will be necessary to mount a rotational lock adapted thereto. However, this is very easy to do, since, for example, only the grub screw must be solved when the rotation lock is disposed in the shaft passage bore, the original rotation lock can be replaced by another new conditions adapted rotation lock. If the rotation lock is arranged on the split pot bottom, it can be removed in a simpler manner, whereby destruction of the rotation lock would also have no negative effects. An exchange of the rotation lock is feasible in any case necessary maintenance.

Further advantageous embodiments of the invention are disclosed in the subclaims and the following description of the figures. Show it:

1 is a magnetic coupling pump in a sectional view, 2 shows a rotation lock in perspective plan view on the free end side as a detail,

3 shows the rotation lock from FIG. 2 in a perspective view from its insertion side into the interior of the rotation lock, [0042] FIG.

[0043] FIG. 4 shows the rotation lock from FIG. 1 in a state inserted in the shaft passage bore as a sectional view, and [0044] FIG. 5 shows a rotation lock which is arranged on a split pot bottom as a sectional image.

In the different figures, the same parts are always provided with the same reference numerals, which is why these are usually described only once.

Figure 1 shows a conveying element 1 in the exemplary embodiment as a magnetic coupling pump 1 with a pump shaft 2, e.g. as a stainless steel shaft 2, which carries an impeller 3, and which is stored in a hydrodynamic sliding bearing 4, wherein the hydrodynamic sliding bearing 4 can be externally lubricated by the conveying medium, but also with another product-compatible fluid.

The magnetic coupling pump 1 has a friction bearing 4a close to the running gear and a sliding bearing 4b remote from the running gear. The respective slide bearing 4 has a bearing sleeve 6, a bearing bush 7 and a thrust bearing element 8 or a bearing washer 8, wherein the letter a for the impeller-near component and the letter b for the impeller-remote component is selected below as an addition to the relevant reference numeral. The shaft 2 carries a rotatably connected thereto first drive element 9, which is referred to below as the inner magnet rotor 9. The inner magnet rotor 9 overlaps the bearing housing 10 in sections.

The inner magnet rotor 9 is in operative connection with a driven second drive element 11, which is referred to below as the outer magnet rotor 11. Between the two magnet rotors 9 and 11, a split pot 12 is arranged, which opposite to the impeller 3 has a split pot bottom 13, wherein a pressure chamber 14 is formed. Between the split pot 12 and the inner magnet rotor 9, a cooling gap is arranged, which opens into the pressure chamber 14.

In the shaft 2, a through hole 15 is introduced, which is open to the pressure chamber 14. Opposite, the through-hole 15 has a medium connection or a further channel system to the impeller 3 of the exemplary magnetic coupling pump 1.

The exemplary magnetic coupling pump 1 is known per se, which is why it is not described in detail. As a result of the rotation of the inner magnet rotor 9, the pumped medium within the containment shell, in particular in the region of the split pot bottom 13, is set in rotation, so that any abrasive particles contained in the conveyed medium could lead to destruction, in particular of the split pot bottom 13.

The invention aims to avoid a possible destruction of the can, in particular its split pot bottom 13 by abrasion due to abrasive particles, which may be contained in the fluid, so that the safety of the magnetic coupling pump 1 is improved. This applies in particular to "non-metallic" containment shells.

According to the invention, a rotation lock 16 is provided, which is arranged in a preferred embodiment in the shaft passage bore 15, preferably directly at the inlet 17 (Figure 4). The rotation lock 16 is shown by way of example in FIGS. 2 and 3 as a detail in a perspective view. In the embodiment recognizable in Figure 1, the inlet 17 of the shaft passage bore 15 is conical. It is also possible a cylindrical configuration of the inlet 17 corresponding to the further course of the shaft passage bore 15th

2 shows the rotation lock 16 with a cylindrical base body 18, on which at least one blade 19 is arranged. In the exemplary rotation lock 16 illustrated in FIGS. 2 to 5, only four blades 19 are arranged by way of example.

The rotation lock 16 is adapted with its cylindrical base body 18 to the configuration of the inlet 17 of the shaft passage bore 15. In this respect, the base body 18 may also have a conical configuration. Of the Base body is sleeve-like running with a free end face 20 and an opposite thereto Einsteckseite 21. The at least one blade 19, that is to say the four blades 19 which can be seen in FIGS. 2 and 3, are arranged on the free end side 20, so that the blades 19 are also arranged directly on the free end side 22 of the inlet 17 of the shaft passage bore 15 (FIG 4) ·

The illustrated rotation lock 16 is produced in one piece with its base body 18 together with the arranged blades 19 by way of example. As can be seen in FIGS. 2 and 3, the rotation lock 16 has at its free end face 20 at least one web 23 on which the at least one blade 19 is arranged. The web 23 extends in the radial direction from an inner wall 24 (FIG. 3) of the main body 18 in the direction of the central axis X1 of the base body 18. The blade 19 is arranged with its foot end 25, that is, with its fastening edge on the web 23, wherein a free edge 26, so the radial edge 26 is rectilinearly bent away from the web 23 of the free end face 20 in the direction of the Einsteckseite 21 wegorientiert. The other free edge 27 of the blade, that is to say the peripheral edge 27, has a course adapted to the inner circumference of the base body 18, and is bent in the same direction away from the inner wall 24. Thus, a profiled blade 19 is formed. The radial edge 26 and the peripheral edge 27 form at their merger a tip 28, which is oriented in the direction of the insertion side 21. In this case, the blade 19, with its free blade leaf thus formed, can have an angle α of 0 to 90 ° with respect to the plane of the free end face 30 of the base body 18 (FIG. 4). The blade 19 is thus virtually in space with its tip 28.

If two blades 19 are provided, two webs 23 are provided, which, viewed in a favorable embodiment in the radial direction join each other, wherein the two blades are profiled as previously oriented. Of course, the vanes 19 could be attached with waiving the webs with its peripheral edge 27 on the inner periphery of the body 18 so that the previously described foot 25 with the radial edge 26 would form the top 28, wherein the blade 19 is also profiled. This would result in the region of the central axis X1 of the main body 18, a central passage, which would be closed in the embodiment with the webs 23. If, as shown by way of example, four blades 19 are provided, four webs 23 are also provided which virtually quarter the free end face 20, wherein the respective blade 19 is bent and profiled as described above. Three bars would therefore third the free face. The same applies analogously if the blades are attached with their peripheral edges on the inner circumference of the body.

If the rotation lock is made in one piece, an insert which has the one, the two, the three or the four blades 19 inserted into the base body and connected to this position-stable. The thus formed rotation lock 16 could then be used as a unit in the shaft passage hole 15.

If the rotation lock 16, as shown in the embodiments, in one piece, the base body 18 is made together with a bottom which is opposite to the insertion side 21 at the future free end face 20 is arranged. From the bottom, the at least one blade 19 is then cut out so that it is fixed with its foot 25 on the remaining web 23, wherein the radial edge 26 and the peripheral edge 27 are cut free, and the common tip 28 extends toward the insertion side 21 , In another possible embodiment, the radial edge 26 and the foot end 25 are cut free, wherein the peripheral edge 27 remains fixed to the inner circumference, wherein the common tip 28 extends in the direction of the insertion side.

It is also possible that the blades 19 opposite, so from the free end face 20 away in the direction of the gap pot bottom 13 extend.

The rotation lock 16 can thus be introduced with its insertion side 21 first in the shaft passage bore 15. As can be seen in FIG. 4, an outer circumference of the rotary lock 16 preferably rests without gaps on an inner circumference of the shaft passage bore 15. The free end face 20 of the rotation lock 16 is flush with the free end face 22 of the shaft passage bore 15. By means of a grub screw, not shown, the rotation lock 16 rotatably and positionally stable in the shaft passage hole 15 are fixed. In this case, an embodiment of the body as a "screw-in" is possible, wherein in the shaft through hole, an internal thread and on the outer circumference of the body, a corresponding external thread can be arranged, wherein the body could of course also have a self-tapping external thread. Thus, the rotation lock 16 can rotate in the direction of rotation of the shaft 2 with this. During the rotation of the shaft 2, a suction flow of the delivery medium or fluid contained in the containment shell 12, in particular in the containment shell region, that is to say in the pressure space 14, is generated. Due to the rotation of the inner magnet rotor 9, the conveying medium within the split pot 12, in particular in the split pot bottom region 13, that is to say in the pressure chamber 14, is likewise set in rotation. With the invention, the movement of the pumped medium is not interrupted. Rather, it is purposefully achieved that the fluid is selectively deflected in the direction of the inlet 17 of the shaft passage bore 15. Thus, the possibly located in the fluid or fluid possibly possible abrasive particles are selectively redirected towards the inlet 17 of the shaft passage hole 15. With the rotation lock 16 in particular a trumpet is prevented. Sedimentation of sediments / solids in the hollow shaft is also significantly reduced.

In Figure 5, a further embodiment is shown, wherein a rotation lock 31 is disposed on the gap pot bottom 13. The rotation lock 31 has a base body 32 which is congruent with its central axis X1 to the central axis X of the shaft passage bore 15, wherein in the wall 33 of the base body 32 at least one inlet opening is arranged. At least one blade 34 is arranged and embodied on the base body 32 in such a way that the conveying medium in its direction of movement, ie the particles in the conveying medium, is deflected in the direction of the inlet 17 of the shaft passage bore 15 in the region of the split pot bottom 13 in a targeted manner.

The at least one blade 34 can, like the blade 19 described above, be arranged on the base body 32, that is to say on its free end face 35, and extend in the direction of a fastening side 36 of the base body 32 lying opposite thereto. Of course, as before, two, three, four or more blades 34 may be provided.

The main body 32 has in its wall at least one inlet opening, preferably a plurality of inlet openings through which the medium can flow into the interior of the rotary lock 31, and is selectively deflected in the direction of the inlet 17 of the shaft bore 15. Basically, the rotation lock 31 may be performed as the rotation lock 16 described above, wherein only the at least one inlet opening, so preferably the plurality of inlet openings in the wall 33 of the body 32 must be introduced. In this respect, reference is made to the description of the rotation lock 16 with regard to the description of the rotation lock 31. The inlet openings 37 can be seen as in the figures 2 and 3 in the rotation lock 16 recognizable as breakthrough, which can also be referred to as a slot, executed in the wall 33. By way of example, four inlet openings 37 are provided. In the illustrated embodiment, the inlet openings 37 extend parallel to the insertion side 21 and to the free end side 20. The inlet openings 37 are arranged in a preferred arrangement closer to the attachment side than to the free end side. Obviously, a further advantage of the invention is that the rotation lock 16 with its arranged in the wall 33 inlet openings 37 can be used universally either in the through hole or arranged on the gap floor. The insertion side 21 could then also be referred to as the attachment side. However, the rotation lock 16 does not have to have the inlet openings, since these are already covered in the installed state in the shaft through hole 15, ie, they are closed. Even with the centric arrangement of the rotation lock 31 or 16 on the split pot bottom 13, the movement of the pumped medium is not interrupted. Rather, it is purposefully achieved that the fluid is selectively deflected in the direction of the inlet 17 of the shaft passage bore 15. Thus, the possibly abrasive particles which are present in the conveying medium or fluid are also deflected in a targeted manner in the direction of the inlet 17 of the shaft passage bore 15. With the rotation lock 31 or 16 in particular a trumpet is prevented.

With the invention, in the case of both possible arrangements of the rotation lock 16 and / or 31, it is thus achieved that abrasion of the containment shell, including the containment shell bottom, due to the solids present in the conveyed medium, is prevented. This prevents wear and tear, further increasing the safety of the magnetic drive pump. If the rotation lock 16 is arranged within the shaft passage bore 15, ie preferably directly in the inlet 17 of the shaft passage bore 15, the containment shell may be formed from any conceivable material, including, for example, stainless steel, ceramic or even glass, to name just a few possible materials merely by way of example , If the rotation lock 31 is fastened to the split-pot bottom 13, it would be possible to use metallic containment pans without this Restrict gap material on it. The actual well-known function of the split pot in connection with magnetic coupling pumps should of course not be affected.

LIST OF REFERENCE NUMBERS

1 magnetic drive pump

2 pump shaft

3 impeller

4 Hydrodynamic plain bearing 6 bearing sleeve

7 bearing bush

8 thrust bearing element

9 Inner magnet rotor

10 bearing housing

11 Outer magnet rotor

12 split pot

13 split pot bottom

14 pressure chamber

15 shaft through hole

16 rotation lock

17 entrance of 15

18 basic body

19 scoop

20 Free front of 18

21 insertion side of 18

22 Free front of 15 or 17

23 footbridge

24 inner wall of 18

25 feet from 19 to 23

26 Radial edge

27 peripheral edge

28 tip

31 rotation lock

32 basic body

33 wall shovel

Free frontage of 32

Mounting side from 32 to 13 inlets in 33

Claims

claims

1. A magnetic coupling pump, comprising a shaft (2) with a shaft passage bore (15), wherein the magnetic coupling pump (1) has an inner rotor (9) and an outer rotor (11), each carrying magnets between which a pressure medium with a pressurized separating chamber (12 ), which has a split-pot bottom (13), characterized in that in the shaft through hole (15) rotatably connected to this rotation lock (16) is arranged so that the conveying medium in its direction of movement in the region of the split pot bottom (13) targeted in the direction of an inlet (17) of the shaft passage bore (15) is deflected.

2. Magnetic coupling pump according to claim 1, characterized in that the rotation lock (16) has a base body (18) on which at least one blade (19) is arranged.

3. Magnetic coupling pump according to claim 1 or 2, characterized in that the rotation lock (16) with its base body (18) to the shaft passage bore (15) or at the inlet (17) is adapted, and is preferably cylindrical or conical.

4. Magnetic coupling pump according to one of the preceding claims, characterized in that the rotation lock (16) on its base body (18) has a profiled blade (19) which both with its radial edge (26) and with its peripheral edge (27) within the Base body (18) in the direction of a Einsteckseite (21) is oriented.

5. Magnetic coupling pump according to one of the preceding claims, characterized in that the rotation lock (16) with its base body (18) and its arranged thereon blade (19) is made in one piece or in one piece and rotatably connected to the shaft (2).

6. Magnetic coupling pump according to one of the preceding claims, characterized in that the rotation lock (16) at its free end face (20) has a web (23) on which at least one blade (19) with its foot end (25) is arranged.

7. A magnetic coupling pump having a shaft (2) with a shaft passage bore (15), wherein the magnetic coupling pump (1) has an inner rotor (9) and an outer rotor (11), each carrying magnets, between which a pressure medium with pressurized fluid separating pot (12) is arranged, which has a split pot bottom (13), in particular according to one of the preceding claims, characterized in that on the split pot bottom (13) a rotation lock (16; 31) is arranged, wherein a base body (32) of the rotation lock (16; ) with its central axis (X) is congruent to the central axis (X1) of the shaft passage bore (15), wherein in a wall (33) of the base body (32) at least one inlet opening (37) is arranged, and wherein on the base body (32) at least a blade (34) is arranged and designed so that the conveying medium in its direction of movement in the region of the split pot bottom (13) in a targeted manner towards an inlet (17) of the shaft passage bore (15) is deflected.

8. A magnetic drive pump according to claim 7, characterized in that the rotation lock (16; 31) has a plurality of inlet openings through which the fluid enters the interior of the rotation lock (16; 31) and so selectively toward the inlet (17) of the shaft bore (15) is redirected.

9. Magnetic coupling pump according to claim 7 or 8, characterized in that the base body (32) has a cylindrical configuration with a free end face (35) and an opposite thereto fastening side (36).

10. Magnetic coupling pump according to one of claims 7 to 9, characterized in that the at least one blade (34) is arranged on a free end face (35) of the base body, wherein the at least one blade (34) at least with its radial edge and / or at least is oriented with its peripheral edge within the body towards a mounting side (36) of the body (32).