DE10315685A1 - Clamping connection for pump shaft cantilever-mounted on motor shaft has portion of cup-shaped pump shaft section embraced by housing bore provided with guide section and clamping section - Google Patents

Abstract

The clamping connection for a pump shaft cantilever-mounted on a motor shaft has a cup-shaped pump shaft section (5.1) with a housing bore, and the portion of the cup-shaped shaft section embraced by the housing bore has a guide section and a clamping section. The clamping section is positioned on the end face of the cup-shaped shaft section and has at least two radially orientated longitudinal slots continuously splitting in the radial direction the circumferential wall of the clamping section between the housing bore and outer boundary.

Description

TECHNICAL TERRITORY

The invention relates to a clamp connection for a flying Pump shaft mounted on a motor shaft, the pump shaft the motor shaft at its end facing away from an impeller within a receiving bore of a pot-shaped shaft part, which through axial longitudinal slit is designed to be elastically deformable in the radial direction, non-positively by Clamping includes and a pump housing via a bellhousing a bearing plate of an engine penetrated by the motor shaft connected is.

STATE OF THE ART

A clamp connection of the generic type is known and comes for example from Tuchenhagen centrifugal pumps GmbH, company brochure Tuchenhagen-VARIFLOW, KN series, pages 2, 8.1 / 23 and 8.1 / 24, for use. This clamp connection is like this designed that the pump shaft facing away from the impeller Finish in a pot-shaped Expanded shaft part, which encompasses the end of the motor shaft. The non-positive Connection is designed as a clamp connection, the peripheral wall the pot-shaped Wave part almost over their entire axial extension is slotted on one side, in the middle, so that one screw connection or even several screw connections in the slotted area a radial narrowing of the slotted area pot-shaped shaft part can effect.

Such a clamp connection, the not only in the area of application mentioned above takes place, but also in many other areas where there is a clamp a radial clamping element on a shaft-like element has the disadvantage that due to the unilateral slitting and the unbalance screw connection arranged there are implemented, which is particularly important for arrangements with a relatively high speed circulate, can be a disadvantage. About that in addition to one at first Exactly axially symmetrically produced cup-shaped shaft part according to it Slitting and subsequent radial deformation in the course of clamping the centricity of the motor shaft receiving bore in the shaft part more or less disturbed, so that thereby the coaxiality between shaft and receiving bore no longer exactly given is. This, albeit minimal, change in position results in another possible cause for one Unbalance.

To compensate for the structural design Imbalances that are already caused become well-known compensatory measures met, which consist, for example, that enable the clamping Recesses (including slots and holes) by appropriate mass-reducing compensatory measures, the mirror image provided to the axis of rotation of the clamp connection will compensate. Unbalance caused by a disturbance of the centricity one that is not always the same and therefore not exactly reproducible Clamping process are due, but are not in advance to compensate and need are usually accepted.

A radial clamping element for jamming on a shaft-like element is known ( DE 30 50 485 C2 ), which works through its symmetrical to the longitudinal axis of the shaft-like element radial clamping elements essentially without the disadvantages described above (unbalance). These are radial clamping elements for non-rotatable clamping to an inner shaft-like element, for example a cylindrical or polygonal shaft, in the form of at least one cup-shaped annular disc, the central opening of which surrounds the outer surface of the shaft-like element with even play and which has an outer, conical main section, which can be axially fixed with its outer edge to an external counter element, the clamping and axial fixing being carried out by means of clamping devices acting on the central region of the annular disc. This radial clamping element is also characterized in that the annular disk, starting from the central opening, is provided with folds in such a star shape that the inner edge of the annular disk delimiting the central opening has a zigzag or wave shape depending on the shape of the fold and that there is a distance between the folds from the central opening, unfolded sections of the annular disk remain which are engaged by the clamping devices.

The clamp connection described above is on the one hand relatively complex and on the other hand it has one relatively large radial extension, which is such a solution for the in The application in question in centrifugal pumps is not exactly recommended.

It is an object of the invention Clamp connection of the generic type simple and absolutely unbalanced.

SUMMARY OF THE INVENTION

This task is due to the characteristics solved in claim 1. Advantageous embodiments of the clamp connection according to the invention are the subject of the subclaims.

The proposed clamp connection is based on the one hand on an absolutely rotationally symmetrical slitting of the clamping part in connection with an absolutely point symmetrical and over the extent of the evenly distributed arrangement causing the clamping Connecting elements (usually these are screw connections), so that the shape interventions and connecting means necessary for clamping, related to the axis of rotation of the pump shaft, overall unbalanced are arranged in the clamping part. Another characteristic of the Proposed clamp connection is that the cup-shaped shaft part a guide part and has a clamping part. While the guide part one of the longitudinal slots has undamaged mounting hole, so that this is a clear and precise Take on leadership role can, the clamping takes place exclusively in the intended Clamping part, which is positioned at the end on the pot-shaped shaft part is and at least two radially oriented, the peripheral wall of the Clamping part between the mounting hole and the outer limit in the axial Direction of continuous longitudinal slits having.

In an advantageous embodiment the clamp connection according to the invention there is a functional separation between guidance and clamping in the pot-shaped shaft part, which is almost about its the entire axial extension is provided with the locating bore, achieved by transverse slots in a plane perpendicular to the Rotation axis are arranged. Each slot is longitudinal assigned a cross section, each cross slot the entire Circumferential wall of the clamping part in the area of the associated longitudinal slot recorded and related axially symmetrical to its axis of symmetry on the plane perpendicular to the axis of rotation. Due to this functional separation, the cup-shaped shaft part is not in one radially deformable area of the receiving bore (guide part) and a clamping area (clamping part) adjoining it on the other side of the transverse slots divided. The clamping part is over its entire axial extent through said longitudinal slots divided, so that a radial elastic deformation of the the slotted cup-shaped shaft part surrounding the receiving bore (peripheral wall) is ensured.

It has been with a view to optimal guidance and clamping proved to be advantageous, as is the case with a Another proposal is provided if the axial extension of the Clamp part three to five times larger than that of the guide part accomplished is.

As part of the proposed according to the invention Clamp connection are two versions favored. The first variant is characterized in that the clamping part of the cup-shaped shaft part by two meridians running opposite to each other, i.e. a circumferential angle of 2 × 180 Longitudinal slots forming degrees is continuously separated.

The second design variant stands out characterized by three longitudinal slots in the clamping part of the cup-shaped Shaft parts are provided, the meridian, half-sided and in one Circumference division of 3 × 120 Degrees.

Since all shape interventions in the pot-shaped shaft part overall must ensure an absolutely unbalanced circulation themselves in this regard necessary measures also on the formation of the functional separation between the clamping part and guide part causing transverse slots. The latter run perpendicular to the longitudinal slots and thus perpendicular to the axis of rotation. The cross slot areas on both sides of the respective longitudinal slots are arranged axially symmetrical to each other. There are a wide variety of designs here feasible, with possible rotation, axially and radially symmetrical arrangements of the longitudinal or transverse slots to each other in the end, the overall arrangement is absolutely unbalanced have to design.

In the second variant with three over the circumference distributed longitudinal slots the associated transverse slots are also each perpendicular on the longitudinal slots and thus perpendicular to the axis of rotation, and they run in a common cross-sectional plane. The cross slots are one below the other geometrically absolutely congruent, they are point symmetrical (based on the axis of rotation) in a circumferential division of 3 × 120 degrees arranged and everyone for is symmetrical to a line running through the meridian plane the central axis of the respective longitudinal slot crossing the axis of rotation educated. The arrangement and is also in the second embodiment variant execution the longitudinal and transverse slots designed such that the overall arrangement is absolutely unbalanced.

Usually narrow longitudinal slots with a disc-shaped Machining tool executed must be in the outfeed area of this tool Longitudinal slot area to be accepted. To ensure trouble-free deformation of the whole To ensure clamping part, it is provided that each longitudinal slot in the area of the guide part in the form of an outgoing longitudinal slot area ends, the latter each receiving hole in the area of Guide part intact leaves. With this configuration, the radial stability, i.e. the rigidity of the cup-shaped shaft part in the area of the guide part not affected.

To ensure that the screw connection assigned to each longitudinal and transverse slot does not result in an imbalance in the clamp connection, the shape interventions required to accommodate the screw connections are arranged in the clamping part in a point-symmetrical manner with respect to the axis of rotation. With a view to the first te embodiment of the clamp connection with two longitudinal slots, this means that each half of the cup-shaped shaft part is assigned a threaded hole on one side and a through hole and the countersink for the screw head on the other side. The other half is designed to be point-symmetrical. Thus, only one screw head (connecting means) is positioned in each of the two halves. With a view to a largely unbalanced rotation of the clamping connection, connecting means of the same shape and dimensions are used (screws, preferably screws with hexagon socket).

The same principle of unbalance in the second embodiment the proposed clamp connection also to the three screw connections transferred in the clamping part. Both the threaded holes and the through holes and the cuts for the screw heads as well as the screws themselves are point symmetrical to each other and over the Circumference evenly distributed, with the point of symmetry by the axis of rotation is defined.

Due to the higher design effort the second variant is compared to the first variant an even more uniform surface pressure due to the clamping achieved, so that a maximum of centricity and freedom from imbalance given is.

The proposed solution principle for an unbalance Clamping of the generic type can be Of course even over three over longitudinal slits distributed around the circumference apply if the diameter ratio of the cup-shaped shaft part allow this, i.e. if the latter is so large in diameter that more than three longitudinal slots and the associated cross slots and screw connections to accommodate space are.

BRIEF DESCRIPTION OF THE DRAWINGS

Two embodiments of the proposed Clamp connection according to the invention are shown in the figures of the drawing and are described below described. Show it

1 a meridian section through a drive motor with a centrifugal pump attached to it on the fly, the pump shaft in turn being mounted on the motor shaft in a floating manner and the pump and motor shaft are connected to one another via a clamping connection according to the invention;

2 a pump shaft in connection with a cup-shaped shaft part for a clamping connection between the pump and the motor shaft according to 1 , wherein the cup-shaped shaft part is shown in a first embodiment variant in the middle section;

2a a view of the pump shaft in connection with the cup-shaped shaft part according to 2 , wherein the view from a top view of the pump shaft according to 2 results;

2 B a cross section through the cup-shaped shaft part according to a in 2 CC marked section;

2c another cross section through the cup-shaped shaft part according to a in 2 cut marked with BB;

3 a pump shaft in connection with a cup-shaped shaft part for a clamping connection between the pump and the motor shaft according to 1 , wherein the cup-shaped shaft part is shown in a second embodiment variant in the middle section;

3a a view of the pump shaft in connection with the cup-shaped shaft part according to 3 , wherein the view from a top view of the pump shaft according to 3 results;

3b a cross section through the cup-shaped shaft part according to a in 3 with CC marked cutting course and

3c another cross section through the cup-shaped shaft part according to a in 3 cut marked with BB.

1

rotary pump

1.1

pump housing

2

drive motor

2a

end shield

3

bellhousing

4

motor shaft

5

pump shaft

5.1

pot-shaped shaft part

5.1.1

location hole

5.1.2

first longitudinal slot

5.1.3

second longitudinal slot

5.1.4

third longitudinal slot

5.1.5

first transverse slot

5.1.6

second transverse slot

5.1.7

third transverse slot

5.1.8

first expiring longitudinal slot area

5.1.9

second expiring longitudinal slot area

5.1.10

third expiring longitudinal slot area

05/01/11

Freeway

05/01/12

first threaded hole

05/01/13

second threaded hole

05/01/14

third threaded hole

05/01/15

first Through Hole

05/01/16

second Through Hole

05/01/17

third Through Hole

05/01/18

first reduction

05/01/19

second reduction

05/01/20

third reduction

5.2

guide part (Fitting portion)

5.3

clamping part

6

Wheel

7

connecting means

R

slot radius

DETAILED DESCRIPTION

A pump housing 1.1 a centrifugal pump 1 ( 1 ) is over a bellhousing 3 on a bearing plate 2a a drive motor 2 fastened on the fly. A motor shaft 4 is from a pot-shaped shaft part 5.1 includes, on the other hand, in a pump shaft 5 extended, which in turn is overhung, an impeller 6 wearing. The cup-shaped shaft part 5.1 has the task in this context, a non-positive connection between the motor and the pump shaft 4 . 5 (Transmission of torque) on the one hand and a rigid, floating bearing of the pump shaft 5 on the motor shaft 4 on the other hand ensure.

The cup-shaped shaft part 5.1 ( 2 ) is on the cylindrical, in the centrifugal pump 1 engaging pump shaft 5 formed. It is with a location hole 5.1.1 provided by that of the pump shaft 5 facing end of the pot-shaped shaft part 5.1 engages in the latter and in the axial direction almost to the transition between the cylindrical pump shaft 5 and cup-shaped shaft part 5.1 extends. The front end of the location hole 5.1.1 is characterized by a so-called undercut 05/01/11 limited.

In the pot-shaped shaft part 5.1 grab from that of the pump shaft 5 a first and a second longitudinal slot facing away from the end face in the axial direction 5.1.2 . 5.1.3 continuously, which are arranged in the middle, opposite each other and thus positioned in a circumferential division of 2 × 180 degrees.

The two longitudinal slots 5.1.2 and range up to a first and 5.1.3 a second cross slot 5.1.5 respectively. 5.1.6 , each perpendicular to the assigned longitudinal slot 5.1.2 . 5.1.3 are oriented and at the same time are perpendicular to the axis of rotation A ( 2 B ). The cross slots 5.1.5 and 5.1.6 are in the pot-shaped shaft part 5.1 positioned axially (see 2 . 2a ) that the slotted area has an axial extension several times longer than the non-slotted area beyond the transverse slots (approx. three to five times the length). Due to the manufacturing process (disk-shaped milling or disk-shaped grinding tool), the longitudinal slot has 5.1.2 . 5.1.3 an outgoing longitudinal slot area 5.1.8 respectively. 5.1.9 , each beyond the first or second transverse slot 5.1.5 . 5.1.6 into the cup-shaped shaft part 5.1 intervenes ( 2 ), the location hole 5.1.1 in the area of a guide part 5.2 from the longitudinal slots 5.1.2 . 5.1.3 is not recorded ( 2 ).

The two cross slots 5.1.5 and 5.1.6 divide the pot-shaped shaft part 5.1 into that of the cylindrical pump shaft 5 immediately adjacent guide part 5.2 and in an adjoining clamping part 5.3 (please refer 2 . 2a ). Both the longitudinal slots 5.1.2 and 5.1.3 as well as the cross slots 5.1.5 and 5.1.6 are in the pot-shaped shaft part 5.1 bounded on each side by a slot radius R determined by the tool to be used (see here 2 and 2 B ). 2 B clarifies that the cross slots 5.1.5 and 5.1.6 are arranged in a plane perpendicular to the axis of rotation A, and each longitudinal slot 5.1.2 . 5.1.3 a cross slot 5.1.5 . 5.1.6 is assigned, each transverse slot the entire circumferential wall of the clamping part 5.3 detected in the area of the associated longitudinal slot and axially symmetrical to its axis of symmetry, which runs in a plane perpendicular to the axis of rotation A, is executed.

The radial deformation of the clamping part 5.3 To achieve the clamp connection is made by means of a screw connection 7 reached ( 2e ), which are each arranged point-symmetrically to the axis of rotation A and the two slotted halves of the pot-shaped shaft part 5.1 merge in the radial direction within the scope of the possible elastic deformation. It comes Men in this connection preferably hexagon socket screws for use, which are designed in the same shape and mass, each of the halves of the cup-shaped shaft part 5.1 is identical to the other. Specifically, this means that the right half, based on the representation according to 2c , on the one hand a first threaded hole 5.1 .12 for the first lanyard 7 and on the other hand a second through hole 5.1 .16 in conjunction with a second drop 5.1 .19 for the second lanyard 7 having. The left half of the cup-shaped shaft part 5.1 also has a second threaded hole 5.1 .13 for the second connection means 7 and on the other hand a first through hole 5.1 .15 in connection with a first lowering 5.1 .18 for the first lanyard 7 ,

It is due to the slot geometry ( 2 B ) on the one hand and on the arrangement of the holes for the connecting means 7 ( 2e ) Secondly, it can be seen that absolute symmetry is realized in all parts of the clamp connection, so that the clamp connection, as far as this is possible at all, is designed to be absolutely unbalanced. The guide part 5.2 the sole purpose is the motor shaft 4 with the pump shaft 5 to insert coaxially while the clamping part 5.3 primarily the task of clamping and, if necessary, also a limited management function.

The second variant of the proposed clamp connection (see 3 . 3a . 3b and 3e ) stands out compared to the first variant according to 2 to 2c characterized in that the arrangement in each case by a third longitudinal slot 5.1.4 , a third cross slot 5.1.7 and inevitably around a third expiring slot area 5.1.10 is expanded (see here 3 . 3a and 3b ).

The third longitudinal slot 5.1.4 allows a third clamping option. The third screw connection for this engages in a third threaded hole 05/01/14 in connection with a third through hole 05/01/17 and a third cut 05/01/20 on ( 3e ). The three clamping points are in turn arranged in such a way that the absolute point symmetry related to the axis of rotation A and the uniform distribution over the circumference are ensured.

Claims (8)

Clamping connection for a pump shaft supported on a motor shaft, whereby the pump shaft ( 5 ) on her one wheel ( 6 ) opposite end of the motor shaft ( 4 ) within a mounting hole ( 5.1.1 ) of a cup-shaped shaft part ( 5.1 ), which is designed to be elastically deformable in the radial direction by means of axial longitudinal slits, comprises non-positively by clamping, and a pump housing ( 1.1 ) via a bellhousing ( 3 ) with one from the motor shaft ( 4 ) penetrated end shield ( 2a ) of a drive motor ( 2 ), characterized in that the from the receiving bore ( 5.1.1 ) included area of the pot-shaped shaft part ( 5.1 ) a guide part ( 5.2 ) and a clamping part ( 5.3 ) has that the clamping part ( 5.3 ) at the end of the pot-shaped shaft part ( 5.1 ) is positioned and at least two radially oriented, the peripheral wall of the clamping part ( 5.3 ) between the mounting hole ( 5.1.1 ) and outer boundary in the axial direction, continuously separating longitudinal slots ( 5.1 .2, 5.1.3 . 5.1.4 ) has that the mounting hole ( 5.1.1 ) in the area of the guide part ( 5.2 ) from the longitudinal slots ( 5.1.2 . 5.1.3 . 5.1.4 ) is not recorded and that all shape interventions necessary for clamping ( 05/01/12 to 05/01/20 ) and lanyards ( 7 ), related to the axis of rotation (A) of the pump shaft ( 5 ), overall unbalanced in the clamping part ( 5.3 ) are arranged. Clamping connection according to claim 1, characterized in that the functional separation of the guide part ( 5.2 ) from the clamping part ( 5.3 ) through cross slots ( 5.1.5 . 5.1.6 . 5.1.7 ), which are arranged in a plane perpendicular to the axis of rotation (A), and each longitudinal slot ( 5.1.2 . 5.1.3 . 5.1.4 ) a cross slot ( 5.1.5 . 5.1.6 . 5.1.7 ) is assigned, with each transverse slot covering the entire circumferential wall of the clamping part ( 5.3 ) detected in the area of the associated longitudinal slot and axially symmetrical to its axis of symmetry, which runs in a plane perpendicular to the axis of rotation (A). Clamping connection according to claim 2, characterized in that the axial extension of the clamping part ( 5.3 ) three to five times larger than that of the guide section ( 5.2 ) is executed. Clamping connection according to one of claims 1 to 3, characterized in that two mutually opposite longitudinal slots ( 5.1.2 . 5.1.3 ) are provided. Clamping connection according to one of claims 1 to 3, characterized in that three longitudinal slots arranged in a circumferential division of 3 × 120 degrees ( 5.1.2 . 5.1.3 . 5.1.4 ) are provided. Clamping connection according to one of claims 1 to 5, characterized in that each longitudinal slot ( 5.1.2 . 5.1.3 . 5.1.4 ) in the area of the guide part ( 5.2 ) in the form of an outgoing longitudinal slot area ( 5.1.8 . 5.1.9 . 5.1.10 ) ends, the latter each receiving hole ( 5.1.1 ) in the area of the guide part ( 5.2 ) leaves intact. Clamping connection according to one of claims 1 to 6, characterized in that the shape interventions for the connecting means ( 7 ), namely profit debores ( 05/01/12 to 05/01/14 ), Through holes ( 05/01/15 to 05/01/17 ) and subsidence ( 05/01/18 to 05/01/20 ), are arranged point symmetrically to the axis of rotation (A) and evenly distributed over the circumference. Clamping connection according to one of claims 1 to 7, characterized in that connecting means of the same shape and mass ( 7 ) Find use.