JP2016205393A - Fluid engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To create a fluid engine capable of easily and surely adjusting an axial clearance between a housing and a radial outer part of an impeller at a comparatively low cost.SOLUTION: An axial clearance is formed between a radial outer part of an impeller and an adjacent part of a housing, a fluid engine has a first stator-side ring structure and a second stator-side ring structure having faces opposed to each other, and the opposed faces are separated from each other in a circumferential direction and provided with projections extended in the axial direction. The ring structures are two defined relative positions, and the ring structures have different axial dimensions as a whole on two defined relative positions, and are connected to each other at one relative position. At the relative position where the ring structures are connected to each other, a dimension of the axial clearance between the housing and the radial outer part of the impeller is adjusted through an axial direction of the ring structures connected to each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fluid engine according to claim 1.

  From Patent Document 1, a turbocharger having a compressor and a turbine is known. The turbocharger compressor disclosed in this document is implemented as a centrifugal compressor, and supercharging air to be compressed is supplied to the centrifugal compressor in the axial direction, and the compressed supercharging air is radially supplied from the centrifugal compressor. To leak. The centrifugal compressor has a stator-side housing and a rotor-side impeller, and the stator-side housing of the centrifugal compressor is composed of a plurality of housing parts coupled to each other. At this time, the first housing part is formed by a helical housing part, the second housing part is formed by a so-called insert, and the helical housing and the insert are connected to each other by screws provided on adjacent flange parts. Yes. An axial gap is formed between the housing insert and the radially outer part of the impeller, and the axial gap is as small as possible to ensure the best possible efficiency of the centrifugal compressor. Must be adjusted to. In practice, such axial clearances in fluid engines are typically adjusted using separate components. Such a separate component may be an adjustment ring, which is attached to the stator side housing for adjusting the axial clearance. Such an adjustment ring must be manufactured very accurately. Only when the fluid engine is installed, by measuring the axial clearance, whether the adjustment ring is manufactured with sufficient accuracy or the axial clearance can be adjusted sufficiently accurately. Can be confirmed. In some cases, mechanical adjustment of the adjustment ring is required to accurately adjust the axial clearance. This increases the installation cost for the fluid engine as a whole.

  There is a need for a fluid engine that can easily and reliably adjust the axial clearance between the housing and the radially outer portion of the impeller at a relatively low cost.

German Patent Application Publication No. 102009021968

  In view of the above points, an object of the present invention is to create a new fluid engine.

  The above problem is solved by the fluid engine according to claim 1. The fluid engine according to the present invention includes a first stator-side ring structure and a second stator-side ring structure, which have surfaces facing each other in the axial direction, and the surfaces facing each other. Are formed with protrusions that are spaced apart from each other in the circumferential direction and extend in the axial direction, and the ring structure has at least two defined relative positions at which the ring structure is the ring. In the coupled state of the structure, the ring structures are coupled to each other at one of two defined relative positions, each having a different axial dimension as a whole. The relative position adjusts the dimension of the axial clearance between the housing and the radially outer portion of the impeller via the axial dimensions of the ring structures joined together. .

  The axial clearance can be adjusted easily, reliably and accurately via the ring structure on the stator side. The relative positions of the ring structures in the circumferential direction are determined by determining the axial dimensions of the stator-side structures composed of the stator-side ring structures and matching the relative circumferential positions, i.e. By adapting the axial dimensions of the ring structure, the axial clearance between the housing and the radially outer part of the impeller can be precisely adjusted.

  Preferably, the fluid engine housing has a plurality of housing portions coupled to each other, an axial gap is formed between one of the housing portions and the radially outer portion of the impeller, and the first ring structure The body is an integral part of the first housing part of the fluid engine, in particular the helical housing part, and the second ring structure is the second housing part of the fluid engine coupled to the first housing part. In particular, an inseparable component of the insert associated with the helical housing part. When the ring structure is an integral part of the housing portion of the fluid engine, a separate component may be omitted. This is particularly advantageous for simple installation of the fluid engine and adjustment of the axial clearance between the housing and the radially outer part of the impeller.

  According to an advantageous development, the first ring structure has stepped protrusions spaced apart from each other in the circumferential direction on the surface facing the second ring structure, and the second ring structure Has stepped protrusions spaced apart from each other in the circumferential direction on the surface facing the first ring structure, and the protrusions of the first ring structure are in the first defined relative position. The ring structure for reducing the axial clearance when abutting the protrusions of the second ring structure is such that the protrusions of the first ring structure are in the second ring structure at a second defined relative position. Than the case where the projection of the second ring structure is engaged with the setback formed between the projections of the first ring structure. Also have a large axial dimension. According to this advantageous development, the axial dimension of the stator-side structure, which is composed of a ring structure, is changed stepwise, and with it between the housing and the radially outer part of the impeller. It becomes possible to adjust the axial clearance stepwise.

  According to an alternative advantageous development, the first ring structure has inclined projections spaced apart from one another in the circumferential direction on the surface facing the second ring structure, The ring structure has sloped protrusions spaced from each other in the circumferential direction on a surface facing the first ring structure, and the protrusions of the first ring structure are protrusions of the second ring structure. When abutting, the axial dimension, and the axial clearance along with it, can be adjusted steplessly between the minimum and maximum dimensions via the defined relative positions of the ring structures. The developed form of the present invention is to continuously and continuously change the axial dimension of the stator-side structure composed of a ring structure, and to make the axial clearance stepless. Makes it possible to adjust.

  Preferably, the first ring structure and the second ring structure are joined to each other by screws extending through the holes in the ring structure. This is advantageous to ensure simple assembly.

  Preferred developments of the invention are described in the dependent claims and in the following detailed description. Embodiments of the present invention will be described in more detail with reference to the drawings. However, the present invention is not limited to the embodiments. The drawings show the following.

It is a figure which shows the cross section of the fluid engine formed as a centrifugal compressor. It is a disassembled perspective view of the detail of the fluid engine which concerns on this invention. FIG. 3 shows a partial section of the detail of FIG. 2 in a possible assembled state of the detail.

  The present invention relates to a centrifugal compressor for a fluid engine, in particular a turbocharger. However, the present invention is not limited to the application example. The invention can also be used in other centrifugal compressors and radial turbines.

  FIG. 1 shows a partial section of a turbocharger in the region of a fluid engine formed as a centrifugal compressor 10. A fluid engine 10 formed as a centrifugal compressor shown in FIG. 1 includes a stator-side housing 11 and a rotor-side impeller 12. The stator-side housing 11 has a plurality of housing parts coupled to each other, that is, in the embodiment shown in the figure, a helical housing part 13 and an insert 14 coupled to the helical housing part 13. The helical housing part 13 and the insert 14 are connected to each other at adjacent flange parts 15, 16, i.e. a plurality of connecting screws 17 spaced apart from one another in the circumferential direction, preferably as expansion screws. It is connected via a connecting screw that is implemented.

  In the embodiment shown in the drawing, that is, the embodiment in which the fluid engine is implemented as a centrifugal compressor 10 of a turbocharger, a so-called bearing housing 18 is connected to the housing 11 of the centrifugal compressor.

  As can be seen from FIG. 1, an axial gap 19 is formed between the housing 11, that is, the insert 14 of the housing 11 and the radially outer portion of the impeller 12. The axial clearance 19 must be precisely adjusted to ensure high efficiency of the fluid engine, in particular the centrifugal compressor 10 shown in FIG. The present invention is a detail of a fluid engine, preferably designed as a centrifugal compressor of a turbocharger, which allows a simple and reliable adjustment of the axial clearance 19 to ensure a high efficiency of the fluid engine. Regarding details.

  According to the present invention, the axial gap 19 can be easily and reliably adjusted via the ring structure on the stator side. That is, FIG. 2 shows a ring structure 20 on the first stator side and a ring structure 21 on the second stator side, the ring structures being separated from each other in the circumferential direction, A protrusion 22 or 23 extending in the axial direction is formed. The protrusions 22 and 23 are formed on surfaces 24 or 25 that face each other in the axial direction of the ring structures 20 and 21. The ring structures 20 and 21 are at least two defined relative positions in the circumferential direction. At the relative positions, the ring structures 20 and 21 have different axial directions in a state where the ring structures are coupled to each other. The ring structures 20 and 21 are coupled at one of the relative positions having the dimensions of the ring structures 20 and 21. The ring structures 20 and 21 are coupled to each other in the circumferential direction. The dimension of the axial gap 19 between the housing 11 and the radially outer portion of the impeller 12 is determined via the axial dimension of the ring structures 20, 21 coupled to each other. Is adjusted.

  Preferably, one of the ring structures on the stator side, for example the ring structure 21, is a component of the first housing part, in particular the component of the helical housing part 13 in the region of the flange part 15 of the helical housing part. Whereas the other ring structure, for example ring structure 20, is an indivisible component of the insert 14 coupled with the helical housing part 13, ie an inseparable component in the region of the flange part 16 of the insert. It is. A defined relative position in the circumferential direction, at which the insert 14 is attached to the helical housing part 13 of the housing 11, the axial relative position of the insert 14 with respect to the impeller 12, and the shaft therewith The dimension of the direction gap 19 is adjusted.

  As already mentioned, in the region of the flange parts 15, 16, the helical housing part 13 and the insert 14 are connected to each other via screws 17, which are connected to the holes 26, 21 of the ring structures 20, 21. 27 extends through.

  2 and 3 show one implementation of the present invention in which the first stator-side ring structure 20 has an axial surface 24 facing the second stator-side ring structure 21. FIG. , The step-like protrusions 22 that are spaced apart from each other in the circumferential direction, each having the same height or step height in the axial direction, and the ring structure 21 on the second stator side, Step-like projections 23 spaced apart from each other in the circumferential direction on the axial surface 25 facing the ring structure 20 on the first stator side, each having the same height or step height in the axial direction. Has protrusions. When the projections 22 and 23 of the two stator-side ring structures 20 and 21 come into contact with each other at the first circumferential relative position, the structure including the ring structures 20 and 21 is as shown in FIG. Further, at the second relative position in the circumferential direction, the projection 23 of the ring structure 21 on the stator side engages with a setback 28 formed between the projections 22 of the ring structure 20 on the stator side. The protrusion 22 of the stator-side ring structure 20 has a larger axial dimension than when engaging the setback 29 formed between the protrusions 23 of the stator-side ring structure 21.

  In the embodiment shown in FIGS. 2 and 3, the stepped protrusion 22 of the ring structure 20 and the stepped protrusion 23 of the ring structure 21 have the same height in the axial direction. The side ring structures 20, 21 can be coupled to one another at two defined relative positions in the circumferential direction, providing two different axial dimensions to each other.

  As can be seen from FIG. 2, at this time, in the region of the ring structure 20, the number of holes 26 that are twice as many as the number of holes 27 formed in the ring structure 21 is provided. In two defined relative positions that the structures 20, 21 can take, it is possible to couple the ring structure via screws 17 to meet the mechanical requirements. At this time, the hole 27 is implemented as a screw hole, for example, and the hole 26 is implemented as a hole without a thread.

Unlike the embodiment shown in FIGS. 2 and 3, at least one ring structure 20 or 21 has a stepped protrusion adjacent in the circumferential direction and a step height greater than one different in the axial direction. Or the height of the ring structures 20, 21 so that the ring structures 20, 21 are more than two possible different from each other in a greater number of defined relative positions in the circumferential direction. It is possible to be able to be coupled together while providing axial dimensions. For this purpose, it is sufficient that one ring structure has a plurality of protrusions having different step heights in the axial direction. In the other ring structure, all the step protrusions have the same height. You may have. The number of holes required in a ring structure having a plurality of different step heights in the axial direction then provides different axial dimensions of the ring structures to the number of holes in the other ring structure. This is equivalent to the product of the number of possible circumferential relative positions. Thus, for example, if N holes are formed in one ring structure, the other ring structure must have x ^* N holes, where x is a different axial direction. The number of possible relative positions of the ring structures 20, 21 that provide the dimensions of

  Further modifications of the embodiment of FIGS. 2 and 3 are as follows. That is, the first ring structure has sloped or wedge-shaped protrusions spaced apart from each other in the circumferential direction on the axial surface facing the second ring structure, and the second ring structure is On the axial surface facing one ring structure, there are similarly inclined or wedge-shaped projections spaced apart from each other in the circumferential direction. When such sloped or wedge-shaped protrusions of the first ring structure abut against the sloped or wedge-shaped protrusions of the second ring structure, the defined circumferential relative positions of the ring structures are Through this, the axial dimension and the axial gap 19 between the housing 11 and the impeller 12 can be adjusted steplessly between the minimum and maximum dimensions.

  In this case, it would be possible to provide the same number of holes in both ring structures. That is, one ring structure is provided with a screw hole for receiving the screw 17 that is spaced apart from each other in the circumferential direction, and the other ring structure is formed as a long hole that is curved in the circumferential direction. Make a hole without a thread.

  In the preferred embodiment of the centrifugal compressor 10 shown in FIG. 1, the ring structure 21 is preferably an integral part of the flange portion 16 of the insert 14. At this time, the ring structure 20 is preferably an integral part of the flange portion 15 of the helical housing 13. The axial position of the insert 14 relative to the impeller 12 by twisting the insert 14 and circumferentially twisting the ring structure of the insert relative to the helical housing 13 and the ring structure of the helical housing with it. Can be adjusted, whereby the axial gap 19 between the housing 11 and the impeller 12 can be adjusted. This relative position is ensured by a connecting screw 17 which serves to connect the two housing parts 13, 14, in which the hole is implemented without threads in one ring structure and the hole in the other ring structure. Are implemented as screw holes.

  If a correct relative position in the circumferential direction is found with respect to the ring structures 20 and 21 in order to adjust the axial gap 19 when installing the fluid engine, the shaft is preferably used in one of the ring structures. At least one of the holes that are not required when joining the ring structure in the correct circumferential relative position for the desired adjustment of the directional clearance is sealed, thereby causing the ring structure to be removed, for example by maintenance In this case, the ring structure can be mounted again at the correct circumferential relative position.

DESCRIPTION OF SYMBOLS 10 Fluid engine 11 Housing 12 Impeller 13 Helical housing part 14 Insert 15 Flange part 16 Flange part 17 Connection screw 18 Bearing housing 19 Axial direction clearance 20 Ring structure 21 Ring structure 22 Projection 23 Projection 24 Surface 25 Surface 26 Hole 27 Hole 28 setbacks 29 setbacks

Claims (10)

A fluid engine having a stator side housing (11) and a rotor side impeller (12), wherein an axial clearance (19) is provided between a radially outer portion of the impeller (12) and an adjacent portion of the housing (11). In the fluid engine in which
A ring structure (20) on the first stator side and a ring structure (21) on the second stator side having opposite faces (24, 25),
Protrusions (22, 23) that are separated from each other in the circumferential direction and extend in the axial direction are formed on the surfaces facing each other,
The ring structure (20, 21) is at least two defined relative positions, and at the relative position, the ring structure (20, 21) as a whole in the coupled state of the ring structure. Are coupled to each other in one of the relative positions, having different axial dimensions;
The relative position where the ring structures (20, 21) are coupled to each other is determined by the axial dimension of the ring structures (20, 21) coupled to each other through the housing (11) and the A fluid engine characterized by a first stator-side ring structure and a second stator-side ring structure that adjusts the dimension of the axial clearance between the radially outer portion of the impeller (12).   The housing (11) has a plurality of housing parts (13, 14) coupled to each other, between one of the housing parts (14) and the radially outer part of the impeller (12). The fluid engine according to claim 1, characterized in that the axial gap (19) is formed in the fluid engine.   One of the ring structures (20, 21) is an integral part of the first housing part, in particular the helical housing part (13), the other of the ring structures (20, 21) being 3. An inseparable component of an insert (14) associated with a second housing part, in particular a helical housing part (13), coupled with a first housing part. Fluid engine.   The first ring structure (20) and the second ring structure (21) have a screw (17) extending through the holes (26, 27) of the ring structure (20, 21). 4. The fluid engine according to claim 1, wherein the fluid engines are coupled to each other. The first ring structure (20) has stepped protrusions (22) spaced from each other in the circumferential direction on a surface (24) facing the second ring structure (21), The second ring structure (21) has stepped protrusions (23) spaced from each other in the circumferential direction on the surface (25) facing the first ring structure (20),
When the protrusion (22) of the first ring structure (20) abuts the protrusion (23) of the second ring structure (21) at the first relative position, the ring structure is: A setback in which the protrusion (22) of the first ring structure (20) is formed between the protrusions (23) of the second ring structure (21) at a second relative position. (29) and the projection (23) of the second ring structure (21) is formed between the projections (22) of the first ring structure (28). 5. Fluid engine according to any one of the preceding claims, characterized in that it has a larger axial dimension than when engaging a setback (28).   All the stepped protrusions (22) of the first ring structure (20) have the same height in the axial direction, and all the stepped protrusions of the second ring structure (21). Each of the protrusions (23) also has the same height in the axial direction, so that the ring structure (20, 21) is in two different relative positions in two different axial directions. The fluid engine according to claim 5, wherein the fluid engines can be coupled to each other while providing dimensions.   The stepped protrusions (22, 23) of at least one ring structure (20, 21) have at least two different heights in the axial direction, whereby the ring structure (20, 21). 6) can be coupled to each other in more than two defined relative positions while providing more than two different axial dimensions to each other. Fluid engine.   The number of the holes (26) in the first ring structure (20) is equal to the number of the holes (27) in the second ring structure (21), and the number of the ring structures (20, 21) is the same. 8. The fluid engine according to claim 5, wherein the fluid engine is multiplied by the number of relative positions providing different axial dimensions.   The first ring structure has sloped protrusions spaced apart from each other in the circumferential direction on a surface facing the second ring structure, and the second ring structure includes the first ring structure Sloped projections spaced apart from each other in the circumferential direction on the surface facing the ring structure, and the projections of the first ring structure abut against the projections of the second ring structure. When contacting, through the defined relative positions of the ring structures, the axial dimension, and the axial gap with it, can be adjusted steplessly between the minimum and maximum dimensions. 5. The fluid engine according to claim 1, wherein the fluid engine is characterized by the following.   One of the holes in the ring structure is formed as a screw hole, and the hole in the other ring structure is formed as a curved long hole provided in the circumferential direction. The fluid engine according to claim 9.

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