DE2357764A1 - ROTOR FOR FLOW MACHINE - Google Patents

Description

The Tec Group, inc ^r

9 Britton Drive,

Bloomfield, Connecticut 2357764

United States of America 59 2? 99

Nov 19, 1973

Rotor for turbomachine.

The invention relates essentially to fluid flow machines and in particular relates to axial fluid machines with an open center, for example in accordance with the specification 2 _o 213, 403.

The invention is based on the object of a new and improved one To create a rotor for a turbomachine with an open center, with segments of the impeller easily and quickly exchangeable meant to be" .

Another object of the invention is to create a rotor in which the impeller segments of one rotor assembly can be replaced by other impeller segments of another rotor assembly in order to create different properties for different areas of application and, in addition, all of the impeller segments of each rotor assembly should be removable and replaceable _o

It is a further object of this invention to provide a new and improved rotor for a turbo machine with individually dismantled or replaced impeller segments, whereby no conventional threaded fasteners are required and in addition, the entire impeller of the rotor can be installed in a detachable manner by easy-to-remove springs, which springs are located between the wheel segments, and are retained by releasable spring washers with respect to the rotor _o

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Furthermore, it is ains Äufgaba of the invention a rotor for a To create a flow machine of the above type, the individual Runner segments of the rotor from each axial end of the rotor can be removed from without doing the seals that Sealing packings, the bearings, the drive wheels or other components the Axia! fluid machine. The purpose of this Äufgalse also includes a new and improved rotor to create where any impeller segment is interchangeable, without the rotor or the turbomachine having to be removed from their place of work for this purpose.

Yet another object of the invention is to provide a new and improved rotor for a turbo machine which is of a much simpler construction so that a single open center turbo machine can be used for a variety of different applications, namely a simple one Replace the impeller assembly without removing other parts of the machine.

Finally, it is an object of this invention to provide a rotor for a turbomachine of the type described above, which has a compact and stable structure and which is particularly easy to manufacture, quick and easy to assemble and dismantle, and also over a long period of time meets high performance requirements.

An embodiment of the invention will now be described with reference to the drawing, in which:

Figure 1 is a side view ^ partly broken away and partly in section, an axial flow machine with a rotor according to the Invention.

FIG. 2 shows a perspective view of the components of the rotor in a representation drawn apart from one another.

Figures 3 to 13 views, partly in section and partly broken away, the rotor in a Sb perpendicular to the rotor axis to show the wheel parts when assembling the running gear the steps to be taken.

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In the drawing, a preferred exemplary embodiment of the invention is shown, which is installed, for example and for purposes of this description in a Äxialströmungsmaschine partially illustrated and is generally designated 10 _o The turbomachine 10 corresponds to the design with an open center for _o example, after the Disclosure Policy 2.313.403 "While the turbo machine shown is a machine with a single stage and only has a single impeller stage, a rotor according to this invention can of course also be used in a turbo machine with several stages."

The turbomachine 10 has a drum or a rotor 12, which is rotatably mounted in a cylindrical chamber 13 which is formed within a housing, which is denoted by 14 is ,, fluid machines of this type require a suitable drive device, e.g. a motor, not shown, for driving a shaft, not shown, which is geared to a drive wheel 16 which, on the one hand, has an output ringraö 18 is in engagement, which is fastened to the outside of the rotor 12 by means of screws 20.

As described in the applicant's application P 23 40 924.7 in from FüTirlicher, mountings for bearings 22 for supporting the rotor 12 for a rotary movement about the center line x_x are provided in the housing 14. The above-mentioned patent application also describes a particular construction of the housing and the rotor according to which annular mounting flanges 24 are provided at the opposite axial ends of the housing 14 to hold Diclitungsanrichtungen, which are partially shown and denoted by 26, in the operating position in relation to the rotor 12 to hold . The eyeglasses and packings of the seal assemblies 26 circumferentially extend about the axial end portions of the outer diameter of the rotor 12 at its opposite axial lines. The particular rotor drive device and the bearing arrangement for supporting the rotor in the housing use 14 as well as the associated sealing devices 26 etc. are not described in detail here since their description is not necessary for understanding this invention _o The patent application ρ 23 40 924 _O 7 is only included here.

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for example, there mentions an embodiment from the patent application mentioned of the drive, the bearings and the sealing parts is as used in the turbo machine 10 v; he the can.

A long-known disadvantage of the turbomachine described The genus is that the impeller blades or the entire impeller must be removed and replaced periodically for various reasons and this is often difficult connected, is time-consuming and expensive because prior to this invention, the drive device, the bearings and the sealing parts the turbomachine had to be expanded, which in turn also Sometimes it had to be removed from the place of use in order to completely remove the rotor to replace. This disadvantage is avoided by the present invention because it is an easily replaceable impeller assembly 3O for the rotor 12 creates a minimal number of components and wherein, for replacing the impeller, the seals 26, the bearings 22 and the drive device IG, 18 of the turbomachine 10 cannot be expanded »

In particular, each impeller assembly 30 according to the invention comprises a plurality of impeller segments 32 which are releasably retained on the inside of the cylindrical wall 38 of the rotor 12 by special means in the circumferential direction according to the teaching of this invention. Three essentially identical impeller segments 32 are provided, each segment 32 having an arcuate, partially cylindrical shoe 40 which fits exactly into a recess 32 which runs in the circumferential direction around the inner wall 38 of the rotor 12 concentrically to the axis XX. The recess 42 has essentially the same length in the axial direction as the wheel shoes 40, but the width "γι" of these shoes is somewhat smaller than the axial length of the recess 42. The thickness of each shoe 40 is equal to the radial depth of the recess 42. In this way, the area of each shoe 40 in relation to the rotor axis XX assumes essentially the same radial position as the rotor inner wall 38, so that the frictional resistance in the turbomachine 10 remains small.

Each impeller segment 32 has a blade 44 _f which for different

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ORIGINAL INSPECTED

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ne areas of application can be formed and d ::. e shovels 44 are usually cast or welded onto the shoes 44 and extend radially inward as a molded component of the segments 32 in the direction of the rotor center line X-X.

According to the preferred embodiment, the arc length of the shoes 40 of each wheel segment 32 is dimensioned such that a predetermined distance between the shoes 40 remains free Circumference of the inner rotor wall 38, so that the 'Spiol "C" is created in the circumferential direction if all the shoes 40 lie against one another (FIG. 9). In this way, the segments 32 can be pivoted radially inward for removal from the open center of the rotor 12. One of the impeller segments may around the shoe of the adjacent wheel segment 32, see Figure 9 "are pivoted so that its axially extending end wall 46 which is of the adjacent wheel segment in spaced, radially inwardly along the dashed line through the free space" C " is pivoted ver in the open center of the rotor 12. The Laufradschauf a. are helical and all have essentially the same structure, so that they do not interfere with each other in the pivoting of the segments to remove the impeller. Furthermore, in order to carry out a quick and easy replacement of the impeller without difficulty, the individual impeller segments 32 are shaped and dimensioned in such a way that a projection of the main dimension of each impeller segment in a plane perpendicular to the axis XX of the rotor (FIGS. 4-13) is smaller than the smallest diameter of the cylindrical inner rotor wall 38, which preferably has a substantially uniform diameter. The individual impeller segments 32 lie in the recess 42 of the rotor and are arranged at a distance from one another in the circumferential direction. According to the illustrated embodiment of the invention, suitable spacers, for example the spring springs 48, are provided between the impeller segments, the springs 48 not only serve as spacers to prevent the individual impeller segments 32 from shifting in the circumferential direction, but in the preferred one Executive

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- 6 example, they also serve as a coupling ^ Lsila u: a to establish an interlocking connection 2v / ischen the rotor 12 and the impeller segments 32. As shown in FIG. 3, which shows the empty rotor 12, grooves 50 are formed in the recess 42 and these grooves extend in the axial direction of the rotor 12 along the length of the recess 42. The grooves 50 are separated from one another in the circumferential direction and lie between adjacent impeller segments 32. The grooves 50 can be machined into the recessed surface of the rotor 12 and the springs 48 are then inserted into these axial grooves 50 (FIG. 11) and serve to transmit the rotary motion from the rotor 12 to the individual impeller segments 32 regardless of the direction of movement of the rotor 12. The springs inserted into the grooves 50, which rest on the adjacent impeller segments 32 (FIG. 12), are essentially connected with their inner surfaces 51 to the inner surfaces of the adjacent shoes 40 as well as to the inner diameter the rotor wall 38 adapted to avoid frictional drag, which would arise if the spring rn 48 would protrude into the space between the impeller blades 44.

In order to avoid further components to hold the impeller segments 32 in place and to avoid undesired radial movement of the individual impeller segments 32 inward if the springs 48 are in position, the axially extending end walls 46 of the adjacent individual shoes 40 of the impeller segments 32 are preferably parallel to one another and also the springs 48 between each pair of adjacent rotor segments 32 are provided with extending in longitudinal direction parallel surfaces 52, which are side by side with ά & η Endwcfnden 46 of the impeller segments 32 into contact.

To hold the rotor components described above during the Two retaining rings or clamps 54 are provided for standstill (FIG 13) which releasably engage the opposite ends of the springs 48. In the preferred embodiment, the ends are of each spring 48 stepped to form a notch 56 for receiving the clips. The clips 54 engage the stepped ends each spring 48 a andöben a radially outwardly directed force from to hold the springs 48 and therefore to Festlialtung the

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individual Eaufradsegmente 32 in the rotor 12 “Eine, Schultex. 48 is different at the transition point between the parts !; Diameter of the rotor wall 33 is formed on the opposite sides of the recess 42 and the ¹ -lamps ″ 54 are dimensioned such that they fit exactly between the respective shoulder 58 and the adjacent circumferential wall of the impeller segments 32 to prevent undesired axial movement of the impeller segments 32 to avoid pulling to the rotor 12 »

When stopped, the clamps 54 hold the impeller assembly 30 in place assembled state against the action of gravity firmly and It should be mentioned here that the terminals 54 in their unloaded State a bigger one. Have diameters than in the loaded state according to their arrangement in the rotor 12 to hold the springs 48 » If the driving force is generated by suitable means such as the illustrated gears 16 and 18 is exercised, so x ^ ird the rotational movement exerted on the impeller blades 44 by means of the springs 48, which lie in the grooves 50. Hold during the movement Centrifugal forces fix the individual impeller segments 32 in relation to the rotor 12.

FIGS. 3-13 show the steps to be taken one after the other for installing the impeller components of the rotor 12 according to this invention. For the purpose of a clear representation, certain components, which are not necessary for the description of the assembly, are shown in FIGS. 3-13 painted. FIG. 3 shows the empty rotor 12 before the introduction of the first impeller segment 32 (FIG. 4) into the rotor for arrangement in the recess 42 (FIG. 5). A second impeller segment 32 '"is then introduced into the rotor chamber, see FIG. 6, and inserted into the recess 42 (FIG. 7) before the third impeller segment 32" is inserted (FIG. 8) and inserted into the recess 42 (FIG. 9) _{or the like} The impeller segments 32 are then removed from one another from the position according to FIG. 9 and set symmetrically in relation to the axially extending grooves 50 (FIG. 10), after which a spring such as, for example, the spring 48 "indicated by dashed lines" is inserted between two impeller segments and radially outwards in the position indicated by the solid lines in his anger 50 (Figure 11)

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is used to hold the adjacent air wheel segments in place 32 in the rotor 12. In FIG. 12 all springs 48 are arranged, after which the clamps 54 are inserted into the notches 56 at the ends of each spring 48 can be used (only one clamp 54 is shown in Figure 13) and between the shoulders 58 of the rotor 12 and the opposite Circumferential cups 60 of the shoes 40 of the impeller segments to be introduced.

If one or more impeller segments 32 are to be removed, so the steps described above only need to be carried out in reverse order. It is only required remove the clips 54 at the opposite ends of the springs 48 and then pull the springs 48 radially inward therewith the impeller segments 32 are moved into the position according to FIG and then one of the impeller segments 32 is to be pivoted into the rotor chamber and can then be removed as already described above.

As a result of the rotor construction according to this invention, a large Number of different tasks by means of the flow machine Io can be carried out, to which various impeller groups with different blade designs are assigned, which are dependent on to be installed in the rotor according to the invention for the respective purpose. There can be other clamps or pins can be used to hold the springs in place and it is not required Hold the impeller segments in place after the springs are in place. In addition, the invention can also be single-stage or multi-stage impellers of turbomachines with open Center application and the replacement of an entire impeller stage or individual impeller segments can be done quickly by anyone The axial end of the rotor can be carried out without the need to remove other components of the rotor or the rotor or the entire machine would have to be removed from its place of use.

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Claims (9)

0 PATH TALK '?. Rotor for a turbo machine has an open center and with a cylindrical inner wall which surrounds the center line of the rotor, characterized in that the rotor has a plurality of impeller segments has, each with an arcuate, partially cylindrical shoe for removable arrangement on the rotor inner wall are provided and each one impeller blade in one piece is formed with the shoe, and extends radially inward therefrom toward the centerline of the rotor, that removable spacers are provided for the releasable distribution of the driving force from the rotor to the shoes of the impeller segments transmitted connection are provided and that removable Clamps are provided to hold the spacers in place the installed position. 2 _O rotor according to claim 1, characterized in that the cylindrical inner wall of the rotor has a substantially uniform diameter, that the impeller segments have an essentially identical structure and are arranged on the inner wall of the rotor in the circumferential direction that each impeller segment is designed and dimensioned in such a way is that a projection of the largest dimension of each impeller segment in a plane perpendicular to the central axis of the rotor is smaller than the smallest diameter of the rotor inner wall, and that the entire circumference of the arched shoes of all impeller segments is less than the circumference of the rotor inner wall each impeller segment can be removed from the rotor, _etc. 3 _O rotor according to claim 1 or 2, characterized in that the shoes of the impeller segments are arranged around the rotor inner wall at a distance from one another, and that the spacers are removable between the adjacent shoes of adjacent impeller segments to produce a detachable connection between the shoes of the impeller segments and the rotor and for holding the impeller segments against displacement in the circumferential direction in relation to the rotor. 4 «, rotor according to one of claims 1 to 3, characterized in that that the shoes of the wheel segments have a uniform width in 409830/0290 - OK - Axial direction of the rotor have that the cylindrical inner wall of the rotor has a concentric recess, which is a larger one The inner diameter has the inner wall of the rotor and in the circumferential direction runs around the inner wall of the rotor, the axial length this recess corresponds essentially to the width of the impeller segments, and that the arched shoes of the impeller segments have a circumferential curvature which corresponds to the curvature of the recess. 5. Rotor according to claim 4, characterized in that the thickness of the arched shoes of the depth of the recess in the inner wall of the rotor thus corresponds to the inner diameter of the built-in one Segments is essentially the same as the inner diameter of the inner wall of the rotor. 6. Rotor according to claim 4 or 5, characterized in that axial Grooves are provided in the recess in the rotor inner wall and extend along the axial length of the recess, wherein these axial grooves are separated from one another in the circumferential direction are and lie between adjacent impeller segments that the spacers are longitudinal springs, which are removable in the axial Grooves of the recess are arranged and that two ring-shaped spring clips protect the longitudinal springs against undesired radial movement hold inward to the center of the rotor. 7. A rotor according to claim 6, characterized gekennzeichne t, that the springs bear against shoulders which are formed at the crossing point of the rotor inner wall of the recess, and that the spring terminals into engagement with the ends of each longitudinal spring are and from the center of the rotor exert an externally directed force on the longitudinal springs. 8. Rotor according to claim 7, characterized in that the ends of the longitudinal springs are stepped to form a notch, and that the spring clips are arranged in the notches of the longitudinal springs and fitted exactly between the shoulders at the opposite ends of the recess and the shoes of the impeller segments an axial displacement of the impeller segments in relation to the rotor avoid* 409830/0290 9. Rotor according to one of claims 1 to 8, characterized gekennzßlehne t "that the axially extending end walls of the shoes adjacent rotor segments are parallel to each other, and that the spacers in the longitudinal direction extending parallel side faces, wherein the parallel side surfaces of the spacers on the side surfaces of the Axial grooves in the rotor and on the parallel end faces of the adjacent impeller shoes rest in order to allow a relative movement between the impeller segments when the rotor rotates in
tors / one way or another to prevent. 1-0. Rotor according to claim 9, characterized in that the longitudinal springs have a radially inwardly facing longitudinal surface lying between the shoes and together with the inner surface of the Shoes and the inner diameter of the rotor inner wall a smooth form inner rotor surface. 40 9830/02 9