DE10315685B4 - Clamping connection for a pump shaft mounted on a motor shaft - Google Patents

Abstract

Clamping connection for a pump shaft mounted on a motor shaft, wherein the pump shaft (5) at its front end facing away from an impeller (6) within a receiving bore (5.1.1) of a cup-shaped shaft part (5.1) by axial Längsschlitzung is configured elastically deformable in the radial direction, frictionally comprises by clamping and a pump housing (1.1) via a pump carrier (3) with one of the motor shaft (4) penetrated bearing plate (2a) of a drive motor (2) is connected, characterized
That the region of the cup-shaped shaft part (5.1) encompassed by the receiving bore (5.1.1) has a guide part (5.2) and a clamping part (5.3),
That the clamping part 5.3 is positioned on the pot-shaped shaft part 5.1 and at least two longitudinally oriented longitudinal slots (5.1.2) separating the peripheral wall of the clamping part (5.3) between the receiving bore (5.1.1) and the outer boundary in the axial direction 5.1.3, 5.1.4),
• that the locating hole (5.1.1) in the area of the guide part (5.2) is not separated from the longitudinal slots (5.1.2, 5.1.3, 5.1.4).

Description

TECHNICAL AREA

The The invention relates to a clamping connection for a flying on a motor shaft mounted pump shaft, with the pump shaft at its one impeller facing away from the front end of the motor shaft within a receiving bore a pot-shaped Wellenteils, by axial Längsschlitzung configured elastically deformable in the radial direction, frictionally by Includes clamp and a pump housing via a bellhousing with one of the motor shaft penetrated bearing plate of an engine connected is.

STATE OF THE ART

A Clamping connection of the generic type is known and comes for example in centrifugal pumps of Tuchenhagen GmbH, company publication Tuchenhagen-VARIFLOW, series KN, pages 2, 8.1 / 23 and 8.1 / 24, for use. This clamp connection is such designed so that the pump shaft facing away from the impeller End in a cup-shaped Wellenteil extended, which includes the end of the motor shaft frictionally. The non-positive Connection is designed as a clamping connection, wherein the peripheral wall of the cup-shaped Wave part almost over their entire axial extent is unilaterally slotted in the middle, so that a screw or more screw in the slotted area a radial narrowing of the slotted cup-shaped shaft part can effect.

A Such clamp connection, not only in the above-mentioned Scope of application finds use, but also in many others Areas where a clamping of a radial clamping element on a shaft-like Element is required has the disadvantage that by the one-sided Slotting and the screw arranged there unbalance are implemented, in particular in arrangements with relative rotate around high speed, can be a disadvantage. In addition, at a first exactly axial pot-shaped manufactured cup-shaped part after its 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 no longer exactly given between the shaft and receiving bore is. Due to this, albeit minimal, change in position results in another possible cause for one Unbalance.

To the Compensation of the already caused by the structural design Imbalances are sufficient known compensatory measures met, for example, which are the clamping enabling Recesses (including slots and holes) by appropriate mass-reducing compensatory measures, the mirror image provided to the axis of rotation of the clamping connection be compensated. Imbalances caused by a disturbance of the centricity a not always the same and therefore not exactly reproducible Clamping process are conditional, however, are not in advance to compensate and have to usually be accepted.

It is known a radial clamping element for clamping on a shaft-like element ( DE 30 50 485 C2 ), which works by its symmetrical to the longitudinal axis of the shaft-like element formed radial clamping elements substantially without the disadvantages described above (imbalances). These are radial clamping elements for non-rotatable clamping on an inner shaft-like element, for example a cylindrical or polygonal shaft, in the form of at least one cup-shaped annular disk whose central opening surrounds the outer surface of the shaft-like element with uniform play and which has an outer, conical main section, which with its outer edge on an outer counter element is axially fixed, wherein the clamping and axial fixing is effected by acting on the central region of the annular disc clamping devices. This radial clamping element is also characterized by the fact that the annular disc is provided starting from the central opening in such a star-shaped folds that the central opening bounding inner edge of the annular disc depending on the wrinkle shape zig-zag or waveform and that between the folds at a distance from the central opening unfolded portions of the annular disc remain to be attacked by the clamping devices.

The Clamping connection described above is on the one hand relatively expensive and on the other hand, it has a relatively large radial extent, thereby such a solution for the in question application with centrifugal pumps not exactly recommended.

It Object of the invention, the clamp connection of the generic type easy and absolutely unbalance design.

SUMMARY OF THE INVENTION

These The object is solved by the features in claim 1. advantageous Embodiments of the clamping connection according to the invention are the subject the dependent claims.

The suggested clamp connection is, on the other hand, based on an absolute one rotationally symmetrical slotting of the clamping part in conjunction with a absolutely point-symmetric and over the circumference equally distributed arrangement of the clamping effecting Fasteners (usually these are bolted joints), so that the necessary form of clamping and connecting means, referred to the axis of rotation of the pump shaft, total unbalance are arranged in the clamping part. Another feature of the proposed clamping connection is that the pot-shaped shaft part a leadership part and having a clamping part. While the leadership part one of the longitudinal slots has intact receiving bore, so that this is a unique and precise Take on management task can, the clamping is done exclusively in the space provided Clamping part, which is positioned at the end of the pot-shaped shaft part is and at least two radially oriented, the peripheral wall of the Clamping part between receiving bore and outer limit in axial Direction continuous dividing longitudinal slots having.

at an advantageous embodiment of the clamping connection according to the invention is a functional separation between leadership and clamping in cup-shaped shaft part, which almost over his entire axial extent is provided with the receiving bore, achieved in that transverse slots in a plane perpendicular to Rotation axis are arranged. Here is each longitudinal slot assigned a cross section, each transverse slot the entire Peripheral wall of the clamping part in the region of the associated longitudinal slot detected and axially symmetrical to its axis of symmetry, based on the plane perpendicular to the axis of rotation, is executed. Through this functional separation, the cup-shaped shaft part is not in one radially deformable area of the receiving bore (guide part) and an adjoining on the other side of the transverse slots clamping area (clamping part) divided. The clamping part is over its entire axial extent through the said longitudinal slots divided, so that thereby a radial elastic deformation of the receiving bore surrounding slotted cup-shaped shaft part (peripheral wall) is ensured.

It has been in terms of optimal guidance and clamping advantageous proved, as according to a further proposal is provided if the axial extent of the Clamping part three to five times greater than those of the leadership part accomplished is.

in the Framework of the invention proposed Klemmverbindung be two variants favored. The first embodiment is characterized in that the clamping part of the cup-shaped shaft part by two meridian running, opposite, i. a circumferential angle from 2 × 180 Degree-forming longitudinal slots is completely separated.

The second embodiment is characterized by the fact that three longitudinal slots in the clamping part of cup-shaped Wellenteils are provided, the meridian, half-sided and in one Circumferential division of 3 × 120 Degrade.

There all Form interventions in the cup-shaped shaft part overall, to ensure absolutely unbalanced circulation the in this regard necessary measures also on the training of the functional separation between clamping part and leadership part causing transverse slots. The latter are perpendicular to the longitudinal slots and thus perpendicular to the axis of rotation. The transverse slot areas on both sides of the respective longitudinal slots are arranged axially symmetrical to each other. Here are the most different forms of design feasible, with possible rotational, axial and radial symmetrical arrangements of the longitudinal and transverse slots to each other in the end, the overall arrangement basically absolutely unbalance have to design.

at the second embodiment with three over the circumference distributed longitudinal slots The associated transverse slots are also each vertical on the longitudinal slots and thus perpendicular to the axis of rotation, and they run in a common cross-sectional level. The transverse slots are with each other geometrically absolutely congruent, they are point-symmetrical (relative to the axis of rotation) in a circumferential pitch of 3 × 120 degrees arranged and everyone for it is symmetrical to a plane passing through the meridian plane, the axis of rotation crossing central axis of the respective longitudinal slot educated. Also in the second embodiment, the arrangement and execution the longitudinal and transverse slots designed in such a way that the overall arrangement is absolutely without imbalance.

Since narrow longitudinal slots are usually made with a disc-shaped machining tool, an expiring longitudinal slot area must be accepted in the outlet area of this tool. To ensure trouble-free deformation of the entire clamping part, It is provided that each longitudinal slot in the region of the guide part ends in the form of an expiring longitudinal slot region, the latter in each case leaving the receiving bore intact in the region of the guide part. By this configuration, the radial stability, ie the rigidity of the cup-shaped shaft part in the region of the guide member is not affected.

In order to also by the each longitudinal and transverse slot associated screw no imbalance in the clamp connection come, are required to accommodate the screw Form interventions in the clamping part arranged point symmetrical to the axis of rotation. With regard to the first embodiment the clamping connection with two longitudinal slots This means that every half of the cup-shaped Wellenteils on the one hand a threaded hole and on the the other side a through hole and the countersink for the screw head assigned. The other half is designed accordingly point-symmetrical to this. Thus is in each of the two halves also only one screw head (connecting means) positioned. in the With regard to a largely unbalance-free rotation of the clamping connection find form and mass equal connection means (screws, preferably screws with hexagon socket) use.

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

By the higher one constructive effort in the second embodiment is compared to the first embodiment a, on the circumference, even more uniform surface pressure due to the clamping achieved, so that by a maximum of centricity and imbalance given is.

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

BRIEF DESCRIPTION OF THE DRAWINGS

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

1 a meridian section through a drive motor with a centrifugally mounted on this centrifugal pump, the pump shaft is in turn mounted on the motor shaft flying and pump shaft and motor shaft are connected to each other via a clamping connection according to the invention;

2 a pump shaft in conjunction 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 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 plan 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 with CC marked cutting course;

2c a further cross section through the cup-shaped shaft part according to a in 2 with BB marked cutting course;

3 a pump shaft in conjunction 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 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 plan 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 a further cross section through the cup-shaped shaft part according to a in 3 with BB marked cutting course.

1

rotary pump

1.1

pump housing

2

drive motor

2a

end shield

3

bellhousing

4

motor shaft

5

pump shaft

5.1

cup-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 via a bellhousing 3 on a bearing plate 2a a drive motor 2 flying attached. A motor shaft 4 is from a cup-shaped shaft part 5.1 on the other hand, that is in a pump shaft 5 extended, which, in turn, cantilevered, an impeller 6 wearing. The cup-shaped shaft part 5.1 has in this context the task of a frictional connection between the motor and the pump shaft 4 . 5 (Transmission of torque) on the one hand and a rigid, flying bearing of the pump shaft 5 on the motor shaft 4 on the other hand.

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 mounting hole 5.1.1 provided by the pump shaft 5 facing away from the end of the cup-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 mounting hole 5.1.1 becomes by a so-called undercut 05/01/11 limited.

In the cup-shaped shaft part 5.1 grab by the pump shaft 5 opposite end face in the axial direction, a first and a second longitudinal slot 5.1.2 . 5.1.3 a continuous, which are each centrally located, facing each other and thus positioned in a circumferential pitch of 2 × 180 degrees.

The two longitudinal slots 5.1.2 and 5.1.3 each extend to a first and a second transverse slot 5.1.5 respectively. 5.1.6 , each perpendicular to the associated longitudinal slot 5.1.2 . 5.1.3 are oriented and thus at the same time perpendicular to the axis of rotation A ( 2 B ). The transverse slots 5.1.5 and 5.1.6 are in cup-shaped shaft part 5.1 positioned axially (see 2 . 2a ) that the slotted area opposite the non-slotted area beyond the transverse slots has a multiple longer axial extent (about three to five times the length). Due to the manufacturing process (disc-shaped cutter or disc-shaped grinding tool) has the longitudinal slot 5.1.2 . 5.1.3 an expiring longitudinal slot area 5.1.8 respectively. 5.1.9 that is beyond the first and second transverse slots, respectively 5.1.5 . 5.1.6 in the pot-shaped shaft part 5.1 engages ( 2 ), wherein the receiving bore 5.1.1 in the area of a management part 5.2 from the longitudinal slots 5.1.2 . 5.1.3 is not recorded ( 2 ).

The two transverse slots 5.1.5 and 5.1.6 divide the cup-shaped shaft part 5.1 in the cylindrical pump shaft 5 immediately adjacent guide part 5.2 and in a subsequent clamping part 5.3 (please refer 2 . 2a ). Both the longitudinal slots 5.1.2 and 5.1.3 as well as the transverse slots 5.1.5 and 5.1.6 are in cup-shaped shaft part 5.1 each limited on one side by a particular of each coming to use tool slot radius R (see 2 and 2 B ). 2 B clarifies that the transverse 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 transverse slot 5.1.5 . 5.1.6 is assigned, each transverse slot, the entire peripheral wall of the clamping part 5.3 detected in the region 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 clamping connection is executed as a screw connection Verbindungsmit tel 7 reached ( 2c ), which are arranged in each case point-symmetrical to the axis of rotation A and the two slotted halves of the cup-shaped shaft part 5.1 merge in the radial direction in the context of possible elastic deformation. It come in this context preferably hexagon socket screws used, which are executed in the same shape and the same mass, each of the halves of the cup-shaped shaft part 5.1 identical to the other is configured. Concretely, this means that the right half, based on the representation according to 2c , on the one hand a first threaded hole 05/01/12 for the first connecting means 7 and on the other hand, a second through-hole 05/01/16 in conjunction with a second reduction 05/01/19 for the second connection means 7 having. The left half of the cup-shaped shaft part 5.1 again has on the one hand a second threaded hole 05/01/13 for the second connection means 7 and on the other hand, a first through hole 05/01/15 in conjunction with a first reduction 05/01/18 for the first connecting means 7 ,

It is at the slot geometry ( 2 B ) on the one hand and on the arrangement of the holes for the connecting means 7 ( 2c ) to the other recognizable that in all parts of the clamp connection an absolute symmetry is realized, so that the clamping connection, if this is possible at all, is designed absolutely unbalance. The guide part 5.2 has only the task, the motor shaft 4 with the pump shaft 5 coaxially, while the clamping part 5.3 It is primarily the task of clamping and, if necessary, subordinate to a limited leadership function.

The second embodiment of the proposed clamp connection (see 3 . 3a . 3b and 3c ) is distinguished from the first embodiment according to the 2 to 2c characterized in that the arrangement in each case about a third longitudinal slot 5.1.4 , a third transverse slot 5.1.7 and inevitably by a third expiring slot area 5.1.10 is extended (see 3 . 3a and 3b ).

The third longitudinal slot 5.1.4 allows a third possibility to clip. The third screw connection engages in a third threaded hole 05/01/14 in conjunction with a third through-hole 05/01/17 and a third cut 05/01/20 one ( 3c ). The three clamping points are again arranged such that the relative to the axis of rotation A absolute point symmetry and the uniform distribution over the circumference remains guaranteed.

Claims (8)

Clamping connection for a pump shaft mounted on a motor shaft, whereby the pump shaft ( 5 ) on its one impeller ( 6 ) facing away from the front end of the motor shaft ( 4 ) within a receiving bore ( 5.1.1 ) of a cup-shaped shaft part ( 5.1 ), which is designed by axial Längsschlitzung in the radial direction elastically deformable, non-positively comprises by clamping and a pump housing ( 1.1 ) via a pump carrier ( 3 ) with one of the motor shaft ( 4 ) penetrated end shield ( 2a ) of a drive motor ( 2 ), characterized in that • that of the receiving bore ( 5.1.1 ) encompassed area of the cup-shaped shaft part ( 5.1 ) a guide part ( 5.2 ) and a clamping part ( 5.3 ), 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 receiving bore ( 5.1.1 ) and outer boundary in the axial direction continuously separating longitudinal slots ( 5.1.2 . 5.1.3 . 5.1.4 ), that the receiving bore ( 5.1.1 ) in the area of the management part ( 5.2 ) from the longitudinal slots ( 5.1.2 . 5.1.3 . 5.1.4 ) is not recorded and • that all formal interventions necessary for clamping ( 05/01/12 to 05/01/20 ) and connecting means ( 7 ), relative to the axis of rotation (A) of the pump shaft ( 5 ), in total unbalance 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 ) of the clamping part ( 5.3 ) through transverse 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 transverse slot ( 5.1.5 . 5.1.6 . 5.1.7 ) is assigned, each transverse slot, the entire peripheral wall of the clamping part ( 5.3 ) is detected in the region of the associated longitudinal slot and is axially symmetrical to its axis of symmetry, which runs in a plane perpendicular to the axis of rotation (A) is executed. 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 lead part ( 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, arranged in a circumferential pitch of 3 × 120 degrees longitudinal slots ( 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 partly ( 5.2 ) in the form of an expiring longitudinal slot area ( 5.1.8 . 5.1.9 . 5.1.10 ), the latter in each case the receiving bore ( 5.1.1 ) in the area of the management part ( 52 ) leaves intact. Clamping connection according to one of claims 1 to 6, characterized in that the mold engagements for the connecting means ( 7 ), namely tapped holes ( 05/01/12 to 05/01/14 ), Through holes ( 05/01/15 to 05/01/17 ) and reductions ( 05/01/18 to 05/01/20 ), point-symmetrical to the axis of rotation (A) and are distributed uniformly over the circumference. Clamping connection according to one of claims 1 to 7, characterized in that form and mass equal connection means ( 7 ) Find use.