JP6014305B2 - Fluid machine insert and fluid machine equipped with the insert - Google Patents

Description

  The invention relates to an insert as claimed in claim 1 and to a fluid machine equipped with such an insert.

  An insert as mentioned at the outset and a fluid machine with a radial flow impeller equipped with such an insert and configured as a compressor are known from US Pat. In the insert described in this document, the end of the second shaft bulges in a mushroom shape when the impeller breaks due to a gap provided in the annular web, or radially outward toward the helical housing of the fluid machine. The web is force-connected and supported by a conical gap in the inner rib of the helical housing, which allows the energy released when the impeller breaks to be converted into deformation energy To do.

  However, in the insert described in Patent Document 1, essentially only the force of the impeller fragment that is released when the impeller is broken and acts radially outward is converted into deformation energy. However, the torsional force of the impeller fragments, which are released when the impeller rotating at a high rotational speed, breaks, is converted to deformation energy by deformation of the insert only to a small extent, depending on the structure of the insert. As a result, the torsional force can reduce the degree of tearing or containment safety of the fluid machine.

German Patent Application Publication No. 10 2005 039 820

  The object of the present invention is to provide an insert as claimed in claim 1, i.e. equipped with such an insert with improved properties with regard to the conversion of the force released when the impeller of the fluid machine breaks. It is to provide an insert that provides higher tear safety for a fluid machine. It is a further object of the present invention to provide a fluid machine equipped with such an insert.

  The above problem is solved by an insert according to claim 1 or by a fluid machine according to claim 12. Further aspects of the invention are each defined in the dependent claims.

  According to a first aspect of the present invention, there is provided an insert for a fluid machine having a radial flow impeller, wherein the insert comprises a hollow cylindrical base body, the base body extending in the axial direction. A first shaft end provided to form a first flow path for the working fluid of the first and second fluids, arcuately extending radially outward and connected to the first flow path toward the radially outer side. And a second shaft end provided to form a second flow path for the working fluid with the hub of the impeller, wherein the annular web is disposed on the outer periphery of the base body at the second shaft end. The annular web is stretched in the axial direction in the direction toward the first shaft end, and the web is interrupted by a plurality of gaps in the circumferential direction, via support means toward the outer periphery of the substrate. At the same time, axially spaced from the web The have, on the outer circumference, is provided with a fixing means for stretching the radially outward insert via the fixing means is securable to a fluid machine housing. The insert according to the present invention is excellent in that the fixing means includes a plurality of fixing ribs that are spaced apart from each other and provided in the circumferential direction, and that the base is adjacent to each other. In the meantime, a slit portion is provided that extends in the circumferential direction and divides the inner wall of the base body in the axial direction.

  According to the present invention, by providing the slit portion that divides the inner wall of the base body in the axial direction, the base body is structurally released when the impeller that rotates at a high rotational speed is broken, and the twist of impeller fragments The force can be transmitted to the fixing rib surrounding the slit portion between itself, and is weakened so that it can be converted into deformation energy by deformation of the fixing rib. Thereby, higher tear safety for a fluid machine equipped with an insert according to the invention is realized.

  The thickness measurement of the fixing rib can be performed according to the desired deformation of the fixing rib or according to the energy received by the fixing rib.

  According to an embodiment of the invention, the insert is an insert for a radial compressor.

  According to the embodiment of the insert according to the present invention, the base is provided with one slit portion extending in the circumferential direction and dividing the inner wall of the base in the axial direction between all the adjacent fixing ribs. ing.

  With this form of the invention, the substrate is further weakened in structure, so that the torsional force is better transmitted to the fixing ribs and a greater reduction of the torsional force is achieved by the stronger deformation of the fixing ribs.

  According to a further embodiment of the insert according to the invention, the fixing ribs are cast on the outer periphery of the base body, and the slits reach the respective root regions of the fixing ribs that form the connection with the base body. As a result, the structural weakening of the root region is achieved.

  In addition, for example in machining, the fixing ribs are weakened in their structural strength by means of slits that penetrate to the root area of the fixing ribs, so that they can be deformed more easily. , Whereby the conversion of torsional force into deformation energy can occur more gently or evenly, thereby further improving the fracture safety of the fluid machine.

  Furthermore, according to a further embodiment of the insert according to the present invention, a first shaft portion of the substrate occupying more than half of the axial length of the substrate and comprising a first shaft end portion of the substrate, and an axial direction of the substrate Each slit portion divides the inner wall of the substrate in the axial direction so as to form a second shaft portion of the substrate that occupies less than half of the length and includes the second shaft end portion of the substrate.

  According to the embodiment of the present invention, each slit portion is provided relatively close to the annular web provided at the second shaft end portion, or swells in a mushroom shape when the impeller breaks, or the first shaft end of the base body The deformation of the second shaft end portion of the base body in the direction toward the portion and outward in the radial direction is facilitated. This is because a joint joint is formed by structural weakening in the slit region. In this way, the force of the impeller debris that is released when the impeller breaks and acts radially outward can be more easily converted into deformation energy.

  Preferably, the division is performed such that the axial length of the first shaft portion completely includes the first flow path, and the axial length of the second shaft portion includes the second flow path.

  Further in accordance with an embodiment of the insert according to the present invention, the first shaft portion occupies approximately two-thirds of the axial length of the substrate, and the second shaft portion is approximately three minutes of the axial length of the substrate. Of 1

  According to the embodiment of the insert according to the present invention, a slit that includes all the slit portions, extends in the entire circumferential direction, and divides the inner wall of the base body in the axial direction is provided in the region of the fixing rib in the base body. The fixing rib has a width that bridges the slits in the axial direction.

  In this form of the invention, the torsional stiffness of the second shaft portion of the insert, to which a torsional force is applied in the event of tearing, is determined only by the root of the fixing rib that bridges the surrounding slit, As a result, the torsional force can be better transmitted to the fixing rib, and even greater reduction of the torsional force can be achieved by the stronger deformation of the fixing rib.

  Furthermore, according to an embodiment of the insert according to the invention, the gaps interrupting the annular web are distributed symmetrically in the circumferential direction, so that in the circumferential direction there are no gaps in the annular web. Protrusions of the same size are formed that are symmetrically distributed.

  This form of the annular web is advantageous for mushroom-like bulges or deformation of the second or second axial end of the substrate in the direction towards the first axial end of the substrate and radially outward. It will be easier. This is because the gap provides a lateral movement space for the protrusion, which is advantageous when the second shaft end portion or the second shaft portion swells like a mushroom. Since the gaps are distributed symmetrically, the movement of the protrusions can proceed evenly in the circumferential direction, and as a result, the deformation that swells in the shape of a mushroom at the end of the second shaft or the second shaft is also circumferential. You can proceed evenly.

  According to a further embodiment of the insert according to the invention, the gaps are each formed in a mirror image with respect to the shape of the projection.

  The shape of the gap is preferably projected along the mirror axis extending along each free end of the projection perpendicular to the central longitudinal axis of the substrate.

  Depending on the shape of the mirror-like gap with respect to the shape of the protrusion, the stresses that occur in the annular web are advantageously taken into account when the second shaft end or the second shaft is deformed, resulting in a deformation that swells in a mushroom shape Is additionally facilitated.

  Furthermore, according to a further embodiment of the insert according to the invention, the gaps interrupting the annular web are calculated to be the same size so as to open a gap in approximately 50% of the annular web in total.

  In this method, only the material required for supporting and fixing the second shaft end portion or the second shaft portion of the insert in the frame of deformation at the inner periphery of the housing described in Patent Document 1 is used. However, the deformation that is left on the web in the shape of the protrusion and then swells in a mushroom shape is further facilitated.

  Each protrusion preferably has the same size as each gap in terms of area.

  Furthermore, according to the embodiment of the insert according to the present invention, each protrusion includes a support rib extending as a support means from the center of the protrusion toward the outer periphery of the base with respect to the circumferential width of the protrusion.

  The support ribs advantageously ensure that the projections do not bend radially inward and can abut on the inner periphery of the housing as a support element during a mushroom-like deformation.

  Furthermore, according to a further embodiment of the insert according to the invention, the number of support ribs is the same as the number of fixed ribs, and each support rib is aligned in the axial direction exactly with respect to the fixed ribs.

  The symmetrical and straight arrangement of the fixing rib and the supporting rib, which is advantageous in terms of casting technology, further advantageously reduces the stress generated in the base body when the second shaft end portion or the second shaft portion is deformed. As a result, deformations that swell in a mushroom shape are even easier.

  According to a second aspect of the present invention, an insert in each possible combination according to one or more or all of the previously described embodiments of the present invention and an inner circumference, the insert A housing having an inner circumference fitted into the circumference, a connecting means to which a fixing rib of the insert is fixed, a bearing rotatably supported by the housing, and coincident with the central longitudinal axis of the base of the insert; A fluid machine comprising a shaft extending in an axial direction into an internal space formed by a base, a hub, and an impeller provided on the shaft in the internal space, and a plurality of blades provided on the hub. The first shaft end of the base forms a first flow path for the working fluid extending in the axial direction, and the second shaft end of the base is connected to the first flow path and is radially A second flow path for the working fluid curved outwards is formed with the impeller hub so that the working fluid must flow radially through the impeller blades and the housing In the region of the annular web of the insert is provided with engagement means with a constant radial distance from the web, by means of which the web provides axial and radial support for the web The second shaft end portion of the base member is engaged with the engaging means by the tearing of the impeller during driving, so that the first base portion of the base member is engaged. A fluid machine is provided in which the insert is configured to be deformable in a direction toward the shaft end and radially outward.

  An insert according to the present invention is provided in a fluid machine, and the base of the insert is structurally released when the impeller that rotates at a high rotational speed breaks. The fluid machine is provided with higher tear safety by being transmitted to the fixing rib surrounding the part and weakened with the intention that it can be converted into deformation energy by deformation of the fixing rib.

  According to an embodiment of the invention, the fluid machine is configured as a radial compressor.

  According to an embodiment of the fluid machine according to the invention, the engagement means comprises a first support surface for the web extending perpendicular to the central longitudinal axis of the insert substrate and facing the annular web, The first support surface is provided at a constant interval in the axial direction from the web.

  Due to the arrangement of the first support surface according to the present invention, when the second shaft end portion or the second shaft portion of the base body is swollen and deformed in a mushroom shape, or in the direction toward the first shaft end portion of the base body and radially outward. As the web is oriented and deformed, the web engages the first support surface in a shape-connecting manner and is axially supported by the first support surface. In this way, the axial movement of the second shaft end portion or the second shaft portion is reliably limited, and the tearing force is reliably received by the housing.

  According to a further embodiment of the fluid machine according to the invention, the housing is provided on its inner circumference, spaced apart from one another in the circumferential direction, and aligned in the axial direction with respect to the web support means. A plurality of reinforcing ribs are provided, and the engaging means is in the shape of a stepped recess and is formed on each of the reinforcing ribs.

  Each of the support ribs of the web projection is preferably exactly aligned with the reinforcement rib.

  By means of an advantageous intended arrangement of the support means of the web with respect to the reinforcing rib, an optimal introduction of force to the reinforcing rib from the second shaft end or the second shaft end of the substrate is realized, whereby the second shaft end. The deformation of the portion or the second shaft portion optimally appears clearly at the second shaft end portion or the second shaft portion.

  Preferably, each of the protrusions has a width in the circumferential direction so as to surely collide with the disposed reinforcing rib even when the insert is subjected to strong torsional deformation.

  Further in accordance with an embodiment of the fluid machine according to the present invention, each stepped recess is perpendicular to the central longitudinal axis of the insert substrate and is a first support for the web facing the annular web And a second support surface for the web that is directly adjacent to the first support surface and extends in a direction parallel to the central longitudinal axis and toward the second shaft end.

  By providing the second support surface in combination with the first support surface, the web or each projection can be supported axially and radially in a shape-connect manner reliably to the housing.

  In the following, the invention will be described in more detail on the basis of preferred embodiments and with reference to the attached figures.

1 is a longitudinal sectional view of a fluid machine according to an embodiment of the present invention. It is a perspective view of the insert of the fluid machine of FIG. FIG. 3 is a perspective sectional view of a part of the insert of FIG. 2. FIG. 4 is a further perspective cross-sectional view of a portion of the insert shown in FIG. 3.

  With reference to FIGS. 1 to 4, a fluid machine 1 according to an embodiment of the invention, described here as a radial compressor of an exhaust gas turbocharger, is described.

  The fluid machine 1 is formed as a housing 10, a shaft 20 (shown only schematically) rotatably supported in the housing 10, an insert 30 fitted in the housing 10, here as a compressor impeller and And an impeller 50 having a hub 51 provided on the shaft 20 so as not to rotate and a plurality of blades 52 provided on the hub 51.

  (Bearing) The housing 10 is fixed and screwed to the helical housing 11.

  The insert 30 includes a circular hollow cylindrical base 31. The base body 31 extends in the axial direction (axial direction AR) and forms a first flow path S1 for the working fluid of the fluid machine 1, and an arcuate radial direction (radial direction RR). Second shaft end portion that forms a second flow path S2 for working fluid, which is connected to the first flow path S1 and is curved radially outward, together with the hub 51 of the impeller 50. 33, so that the working fluid must flow radially through the blades 52 of the impeller 50.

  The second shaft end portion 33 of the base 31 is provided with an annular web 36 on the outer periphery 31 a of the base 31, and the annular web 36 extends in the axial direction toward the first shaft end 32. 36 is interrupted in the circumferential direction (circumferential direction UR) by a plurality of gaps 37 that are spaced apart from each other, provided circumferentially spaced from each other, and the web The support 31 is cast toward the outer periphery 31a of the base 31 via a plurality of support ribs 38 that form support means.

  A plurality of fixing ribs 34 extending outward in the radial direction and spaced apart from each other in the circumferential direction are formed on the outer periphery 31a of the base 31 and form fixing means. The fixing rib 34 commonly ends at a ring flange 35 provided toward the radially outer side of the base body 31, and the insert 30 is screwed by a screw 35 a via the ring flange 35. It is fixed to the helical housing 11 of the fluid machine 1.

  The circumferential thickness measurement of the fixing rib 34 is suitably performed for the desired deformation of the fixing rib 34 or for the fracture energy received by the fixing rib 34.

  As can be seen in particular in FIG. 2, the number of support ribs 38 is the same as the number of fixed ribs 34, and each support rib 38 is aligned with the fixed ribs 34 in the axial direction.

  The helical housing 11 of the housing 10 includes an inner periphery 12 in which the insert 30 is fitted, and a connection flange 13 that provides a connection means in which a ring flange 35 of a fixing rib 34 of the insert 30 is fixed by a screw 35a. I have.

  The shaft 20 is rotatably supported by the housing 10 and coincides with the central longitudinal axis (not shown) of the base body 31 of the insert 30 and enters the internal space 31b formed by the base body 31 in the axial direction. The impeller 50 is provided in the internal space 31b.

  The helical housing 11 of the housing 10 is provided on the inner periphery 12 thereof in the region of the annular web 36 of the insert 30 with a distance from each other in the circumferential direction, with a constant distance from the web 36 in the radial direction. A plurality of reinforcing ribs 14 are provided which are axially aligned with one of the support ribs 38 of the web 36 and form engaging means. Each reinforcing rib 14 is provided with one stepped recess 15.

  Each stepped recess 15 extends perpendicular to the central longitudinal axis of the substrate 31 of the insert 30, faces the annular web 36 and has a constant axial distance from the web 36. A first support surface 15a and a second support surface 15b for the web 36 extending directly in the direction toward the second shaft end 33 parallel to the central longitudinal axis and directly adjacent to the first support surface 15a It has.

  As apparent from FIG. 1 in particular, when the second shaft end portion 33 bulges and deforms in a mushroom shape due to the breakage of the impeller 50 or in the direction toward the first shaft end portion 32 of the insert 30, the radius The web 36 with the stepped recess 15 of the reinforcing rib 14 of the helical housing 11 that, when oriented and deformed outwardly, provides axial and radial support for the web 36. The web 36 is supported on the first support surface 15a in the axial direction and on the second support surface 15b in the radial direction.

  At this time, the second shaft end portion 33 is engaged with the concave portion 15 by the tearing of the impeller 50 during driving, so that the web 30 is engaged with the concave portion 15, so that the direction toward the first shaft end portion 32 of the insert 30 is increased. The insert 30 is configured so as to be deformable toward the front.

  In order to allow the insert 30 to be deformed more satisfactorily, the base body 31 extends between the adjacent fixing ribs 34 in the circumferential direction and slits 39 (see FIG. 3 and 4). In the described embodiment of the present invention, each of the slits 39 extending in the circumferential direction and dividing the inner wall of the base body 31 in the axial direction is provided in the base body 31 between all the fixing ribs 34 adjacent to each other. Is provided.

  As is particularly apparent from FIG. 1, in the described embodiment of the present invention, all the slit portions 39 are all formed in the circumferential direction and formed with slits 40 that divide the inner wall of the base 31 in the axial direction. The fixing rib 34 has an axial width that bridges the slits 40 in the axial direction, as shown in FIGS.

  As is clear from FIGS. 1, 3, and 4 in particular, each slit portion 39 or the slit 40 including all the slit portions 39 is a base region of each fixing rib 34 that forms a connection portion with the base 31. As a result, the structural weakening of the root region 34a is achieved.

  As is most apparent from FIG. 1, the first shaft portion 32 a of the base body 31 occupies more than half of the axial length of the base body 31 and includes the first shaft end portion 32 of the base body 31, and the axial direction of the base body 31. The slit portion 39 or the slit 40 pivots on the inner wall of the base 31 so as to form the second shaft 33a of the base 31 that occupies less than half of the length of the base 31 and includes the second shaft end 33 of the base 31. Split in direction. According to the described embodiment of the present invention, the first shaft portion 32a occupies approximately two-thirds of the axial length of the base 31 and the second shaft portion 33a has an axial length of the base 31. It occupies about one third.

  As is clear from FIG. 2 in particular, the gaps 37 for interrupting the annular web 36 are distributed symmetrically in the circumferential direction, and as a result, protrusions 36a are formed at locations where there is no gap in the annular web 36. Has been. The gaps 37 that interrupt the annular web 36 are calculated to have the same size so that the gaps are opened to approximately 50% of the annular web 36 in total. The gaps 37 are mirror images of the shape of the protrusion 36a. Is formed. In other words, the shape of the gap 37 is projected along a mirror axis (not shown) extending along each free end of the protrusion 36 a perpendicular to the central longitudinal axis of the base 31.

  Each of the protrusions 36a is casted with a support rib 38 that extends radially inward to the outer periphery 31a of the base body 31 at the center with respect to the circumferential width of the protrusion 36a.

  Therefore, when the impeller 50 is torn, the second shaft end portion 33 or the second shaft portion 33a of the base body 31 is swollen like a mushroom, or the direction toward the first shaft end portion 32 of the base body 31 is caused. When projecting toward the outside in the radial direction, each of the projections 36a of the web 36 reaches a shape-connecting engagement in one recess 15 of the reinforcing rib 14, and the projection 36a is recessed in the axial direction. The first support surface 15a is supported by the second support surface 15b in the radial direction.

DESCRIPTION OF SYMBOLS 1 Fluid machine 10 Housing / bearing housing 11 Helical housing 12 Inner circumference 13 Connection flange 14 Reinforcement rib 15 Recess 15a 1st support surface 15b 2nd support surface 20 Shaft 30 Insert 31 Base 31a Outer periphery 31b Inner space 32 1st shaft end 32a First shaft portion 33 Second shaft end portion 33a Second shaft portion 34 Fixing rib 34a Root region 35 Ring flange 35a Screw 36 Web 36a Projection portion 37 Gap 38 Support rib 39 Slit portion 40 Slit 50 Impeller 51 Hub 52 Blade S1 First 1 flow path S2 2nd flow path AR axial direction RR radial direction UR circumferential direction

Claims (14)

An insert (30) for a fluid machine (1) having a radial flow impeller (50), the insert (30) comprising a hollow cylindrical base (31), the base (31) being axially A first shaft end (32) provided to form a first flow path (S1) for the working fluid of the fluid machine (1) that extends, and extends radially outward in an arcuate shape And a second flow path (S2) for the working fluid, which is connected to the first flow path (S1) and curved outward in the radial direction, is formed together with the hub (51) of the impeller (50). A second shaft end (33) provided for
An annular web (36) is provided on the outer periphery (31a) of the base (31) at the second shaft end (33), and the annular web (36) is attached to the first shaft end (32). The web (36) is stretched in the axial direction in the direction toward the web, and the web (36) is interrupted by a plurality of gaps (37) in the circumferential direction and supported by support means toward the outer circumference (31a).
Fixing means extending radially outward is provided on the outer periphery (31a), and the insert (30) can be fixed to the housing (10) of the fluid machine (1) via the fixing means. In the insert
The fixing means includes a plurality of fixing ribs (34) provided in the circumferential direction at intervals from each other, and the base (31) is located between the fixing ribs (34) adjacent to each other. And a slit portion (39) extending in the circumferential direction and dividing the inner wall of the base body (31) in the axial direction .
Between all the fixing ribs (34) adjacent to each other, a slit portion (39) extending in the circumferential direction and dividing the inner wall of the base body (31) in the axial direction is formed in the base body (31). An insert (30) characterized in that it is provided . The fixing rib (34) is cast on the outer periphery (31a) of the base body (31), and the slit portion (39) forms a connection portion with the base body (31). extending radially up to the respective root area of the rib (34) (34a), as a result, according to claim 1, characterized in that the weakening of the structure of該根source region (34a) is achieved Insert (30). A first shaft portion (32a) of the base body (31) that occupies half or more of the axial length of the base body (31) and includes the first shaft end portion (32) of the base body (31); A second shaft portion (33a) of the base body (31) that occupies less than half of the axial length of the base body (31) and includes the second shaft end portion (33) of the base body (31). The insert (30) according to claim 1 or 2 , wherein each slit portion (39) divides the inner wall of the base body (31) in the axial direction so as to be formed. The first shaft portion (32a) occupies two-thirds of the axial length of the base body (31), and the second shaft portion (33a) is 3 times the axial length of the base body (31). 4. Insert (30) according to claim 3 , characterized in that it occupies a fraction. A slit (40) that includes all the slit portions (39), extends in the entire circumferential direction, and divides the inner wall of the base body (31) in the axial direction is formed in the base rib (34). is provided with a region of) the fixed ribs (34) are each of claims 1 to 4, characterized in that it comprises a width such that bridging the slit (40) in the axial direction The insert (30) according to any one of the preceding claims. The gaps (37) for interrupting the annular web (36) are distributed symmetrically in the circumferential direction, and protrusions (36a) are formed at locations where there are no gaps in the annular web (36). insert as claimed in any one of claims 5, characterized in that there (30). The insert (30) according to claim 6 , wherein each of the gaps (37) is formed in a mirror image with respect to the shape of the protrusion (36a). The gap (37) for interrupting the annular web (36) is calculated to be the same size so as to open a gap in 50% of the annular web (36) in total. The insert (30) according to any one of claims 7 to 9. Each protrusion (36a) serves as a support means that extends in the circumferential direction of the protrusion (36a) from the center of the protrusion (36a) toward the outer periphery (31a) of the base body (31). 9. Insert (30) according to any one of claims 6 to 8 , characterized in that it comprises a rib (38). The number of the support ribs (38) is the same as the number of the fixed ribs (34), and the support ribs (38) are aligned in the axial direction accurately with respect to the fixed ribs (34). 10. Insert (30) according to claim 9 , characterized by the fact. A fluid machine (1),
Insert (30) according to any one of claims 1 to 10 ,
A housing (10) having an inner periphery (12) into which the insert (30) is fitted, and connection means to which a fixing rib (34) of the insert (30) is fixed;
An internal space (31b) formed by the base body (31), which is rotatably supported by the housing (10) and coincides with the central longitudinal axis of the base body (31) of the insert (30). A shaft (20) extending axially into the shaft,
A fluid machine having a hub (51) and a plurality of blades (52) provided on the hub (51), and an impeller (50) provided on the shaft (20) in the internal space (31b). Because
The first shaft end portion (32) of the base body (31) forms a first flow path (S1) for the working fluid extending in the axial direction, and the second shaft end of the base body (31). The part (33) is connected to the first flow path (S1) and is connected to the second flow path (S2) for the working fluid curved outward in the radial direction, and the hub (51) of the impeller (50). So that the working fluid must flow radially through the blade (52) of the impeller (50);
The housing (10) is provided with engagement means on the inner periphery (12) thereof in the region of the annular web (36) of the insert (30), and the web (36) is provided by the engagement means. It is possible to achieve a shape-connective engagement that provides axial and radial support for the web (36);
When the impeller (50) is broken during driving, the second shaft end (33) of the base (31) is engaged with the engaging means by the web (36). 31. The fluid machine (1), wherein the insert (30) is configured to be deformable in a direction toward the first shaft end portion (32) of 31) and outward in the radial direction. The engagement means extends first perpendicular to the central longitudinal axis of the base body (31) of the insert (30) and faces the annular web (36), the first for the web (36). 12. The fluid machine (1) according to claim 11 , comprising a support surface (15a). The housing (10) is provided on the inner periphery (12) thereof at intervals in the circumferential direction, and is aligned with the support means of the web (36) in a straight line in the axial direction. 13. The fluid machine according to claim 12 , further comprising a reinforcing rib (14), wherein the engaging means is formed in each of the reinforcing ribs (14) in the shape of a stepped recess (15). (1). Each stepped recess (15) extends perpendicular to the central longitudinal axis of the base (31) of the insert (30) and faces the annular web (36). Extending in a direction directly adjacent to the first support surface (15a) and parallel to the central longitudinal axis and toward the second shaft end (33). The fluid machine (1) according to claim 13 , characterized in that it comprises a second support surface (15b) for the web (36).

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