Abstract:
A turbomachine, in particular, a compressor, having a housing and having at least one housing insert accommodated therein and having a fitting piece for the adjustment of a gap dimension between the housing and the housing insert, wherein the housing comprises, for the adjustment of the gap dimension, a horizontally adjustable guide element into which the fitting piece is inserted, is provided.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims priority to PCT Application No. PCT/EP2013/053096, having a filing date of Feb. 15, 2013, based off of DE 102012202468.9 having a filing date of Feb. 17, 2012, the entire contents of which are hereby incorporated by reference. 
     
    
     FIELD OF TECHNOLOGY 
       [0002]    The following relates to a turbomachine, in particular, a compressor, having a housing and at least one housing insert received therein and an adjusting piece for adjusting a gap size between the housing and the housing insert. 
       BACKGROUND 
       [0003]    Compressors comprise a housing with a housing insert, which can be inserted, serves as a stator and is also called a return stage. Each rotor of the compressor is usually assigned a return stage. With regard to use at low temperatures or in the case of great temperature differences, return stages can have a three-point mounting. Said three-point mounting is necessary, in order that the components can expand thermally, without causing pressure between the housing and the return stage or other components which are attached in the interior of the housing. The adjusting or centering of a return stage takes place via three mounting points, on which the return stage is mounted. In practice, the radial orientation or adjustment of the return stage via said three points is difficult, however, since the return stage can lie eccentrically with respect to the housing as a result of tolerances. In the case of eccentric mounting of this type, the gap between the return stage and a shaft of the compressor is reduced on one side, with the result that rubbing of the rotor might occur in the worst case. In practice, the radial guidance of the housing insert (return stage) is therefore adapted in a complicated manner if the internal diameter and external diameter are not concentric. 
         [0004]    This operation is shown diagrammatically in  FIG. 1 .  FIG. 1  shows a housing  1  of a conventional turbomachine and a housing insert  2  which is received spaced apart therein. The measurement and adaptation are complicated, since a gap s which is measured between the housing  1  and the housing insert  2  has to be transferred to a gap t at the lowest point of the housing insert. It has to be ensured here that the internal diameter lies coaxially with respect to the housing middle or with respect to the bearing center. 
         [0005]    The vertical orientation of the housing insert  2  takes place by way of two adjusting pieces in the joint region. The adjusting pieces which are shown using dashed lines in  FIG. 1  are connected to the housing insert  2  and are adapted; a gap is situated to the side thereof. A further adjusting piece which assumes the horizontal guidance is used on the underside. In order to adapt said adjusting piece laterally, it is necessary to remove the housing insert  2  from the turbomachine, possibly several times. A gap is situated below the said adjusting piece, in order to make a vertical movement of the housing insert  2  possible. 
       SUMMARY 
       [0006]    An aspect relates to a turbomachine, in which the adjustment of the housing insert is simplified. 
         [0007]    A turbomachine of the type mentioned at the outset has a housing that comprises a horizontally adjustable guide element with a recess for adjusting the gap size, into which recess the adjusting piece which is connected to the housing insert is inserted. 
         [0008]    The turbomachine according to embodiments of the invention has the advantage that the complicated adaptation of an adjusting piece can be dispensed with, since the gap size can be brought about by way of a horizontal adjustment of the guide element. The guide element serves to guide the adjusting piece which can be adjusted along an axis as a result, in order to set a defined gap size. 
         [0009]    It also lies within the scope of the embodiments of the invention that the guide element has a horizontally running threaded bore which is aligned with a through bore in the housing, with the result that a screw or threaded rod which penetrates the through bore can be screwed in. Accessibility from the outside to the guide element which is arranged adjustably on the housing is made possible by way of the through bore. 
         [0010]    A further setting option results if the adjusting piece in the turbomachine according to embodiments of the invention is inserted with axial play into the guide element. 
         [0011]    It can be provided within the scope of one development of the embodiments of the invention that the adjusting piece can be connected or is connected to the housing insert by means of a screw connection. In this way, the housing insert is connected fixedly to the adjusting piece, with the result that an adjustment of the housing insert can take place indirectly by way of an adjustment of the adjusting piece by way of adjusting of the guide element. 
         [0012]    In the turbomachine according to embodiments of the invention, the recess of the guide element can have an emptying bore which preferably opens into a radial groove between the guide element and a housing rib. A liquid can be discharged from the recess of the guide element through said emptying bore. 
     
    
     
       BRIEF DESCRIPTION 
         [0013]    Some of the embodiments will be described in detail, with reference to the following figures, wherein like designations denote like members, wherein: 
           [0014]      FIG. 1  shows a detail of a conventional turbomachine; 
           [0015]      FIG. 2  shows a first exemplary embodiment of a turbomachine according to the invention in a sectioned view; and 
           [0016]      FIG. 3  shows a second exemplary embodiment of a turbomachine in a sectioned view. 
       
    
    
     DETAILED DESCRIPTION 
       [0017]    The turbomachine  3  which is configured as a compressor and is shown in details in a sectioned view in  FIG. 2  comprises a housing  4 , into which a housing insert (return stage)  5  which is shown merely partially is inserted. The housing insert  5  has the function of a stator and serves to deflect a flow in the housing  4  of the turbomachine  3 . In order for it to be possible to adjust the housing insert  5  in the horizontal direction which is identified by way of a double arrow  6 , a guide element  7  is provided which is arranged in a recess  8  of the housing  4 . By way of orientation of the return stage  5 , an adjusting piece  13  which is mounted in a return stage  5  fixes the position. During the insertion of the return stage  5 , the guide element  7  is oriented in accordance with the position of the return stage  5 . Subsequently, the fixing is effected by way of a threaded rod  11  and nuts  16 . 
         [0018]    As is shown in  FIG. 2 , the guide element  7  has a threaded bolt  9  which runs in the radial direction and is aligned with a through bore  10  in the housing  4 . The threaded rod  11  penetrates the through bore  10  and is in engagement with the threaded bore  9 , with the result that the position of the guide element  7  can be fixed by way of the threaded rod  11 . The threaded rod  11  is screwed in until the projecting lengths on both sides are identical; the threaded rod  11  is held by way of the nuts  16 , in each case one shim being used, with the result that a play-free connection is produced. 
         [0019]    On its side which points into the housing interior, the guide element  7  has a recess  12 , into which the adjusting piece  13  is inserted in an axially movable manner. The adjusting piece  13  has a through bore  14 ; the housing insert  5  is screwed to the adjusting piece  13  by means of a screw  15  which is inserted into the through bore  14 . The axial fixing of the housing insert  5  is effected by way of a circumferential feather key. 
         [0020]    After the adjustment of the guide element  7 , the threaded rod  11  is screwed at its two ends by way of nuts  16 . The nuts  16  are covered in each case by way of flanges  17 . 
         [0021]    It can be seen in  FIG. 2  that the guide element  7  is offset to the outside in comparison with the housing  4 , away from the housing insert  5 ; accordingly, a greater gap is formed between the guide element  7  and the housing insert  5  than between the housing  4  and the housing insert  5 . 
         [0022]    The guide element  7  has an emptying bore  18  which is connected to the recess and is arranged approximately in the center of the guide element  7 . The emptying bore  18  opens into a radial groove  19 , from where a fluid to be discharged can be drained off to the outside. 
         [0023]    The turbomachine  3  which is shown partially in  FIG. 2  has the advantage that a radial adjustment or orientation of the housing insert  5  is possible by means of the guide element  7  which is subsequently fixed on the housing  21 , with the result that complicated and awkward adaptation of the adjusting piece  13  is dispensed with. 
         [0024]      FIG. 3  shows a second exemplary embodiment of a turbomachine  20  which is of similar construction to the turbomachine  3  which is shown in  FIG. 2 . A detailed description of corresponding components is therefore dispensed with at this point. The same designations are used for corresponding components. 
         [0025]    In conformity with the first exemplary embodiment, a guide element  7  is arranged radially adjustably in a recess  8  of a housing  21 . The adjusting piece  13  which is screwed to the housing insert  5  is arranged in the recess  12  of the guide element  7 . 
         [0026]    In order to fix the gap between the housing insert  5  and the housing  21  after the adjustment, a screw  22  is provided which is screwed into the threaded bolt  9  of the guide element  7 . The screw  22  penetrates a through bore  23  in the housing  21  and opens into a blind bore  24 . After the gap size between the return stage  5  and the housing  21  has been set, the screw  22  is screwed in in order to fix the position of the guide element  7 ; the screw is fixed by way of a threaded washer  25  which bears against the screw head. The head of the screw absorbs forces in the direction of the arrow  6 ; the threaded washer  25  prevents movements in the other direction, which is shown by way of the opposite arrow  26 . 
         [0027]    Unlike in the conventional procedure for gap adaptation, in which the adjusting piece is ground in a complicated manner, it is not necessary to remove the housing insert  5  in the turbomachine  20  which is shown in details in  FIG. 3 . The required mounting time is shortened considerably as a result of the position which can be fixed by means of the screw  22 . 
         [0028]    Although the invention has been illustrated and described in greater detail by the preferred exemplary embodiment, the invention is not restricted by the disclosed examples, and a person skilled in the art can derive different variations herefrom, without departing from the scope of protection of the invention.