Gearbox housing with reinforced joint

Abstract

Fluid machine, in particular turbine, turbo compressor, multi-stage geared compressor or pump, with a split housing (1) with a gearbox received in the split housing (1) having a large gear shaft and with at least one, preferably two, pinion shaft(s) meshing with a large gear arranged on the large gear shaft, wherein the pinion shaft(s) and the at least one large gear shaft are received in receiving sections (7, 8) on the housing elements (2, 3), in particular by means of bearings, in a split joint (4), wherein the split housing (1) is designed for a gearbox with at least one gearbox shaft, wherein the split housing (1) - with at least one first, lower housing element (2) with an upper edge (5) and a second, upper housing element (3) with a lower edge (6), wherein the upper edge (5) of the first, lower housing element (2) is connected to the lower edge (6) of the second, upper housing element (3) via a partial joint (4), - in the first, lower housing element (2) in the area of ​​its upper edge (5) at least one lower receiving section (7) and in the second, upper housing element (3) in the area of ​​its lower edge (6) at least one upper receiving section (8) are provided, wherein the transmission shaft can be received in the at least one lower receiving section (7) and the at least one upper receiving section (8), wherein - the first, lower housing element (2) in the area of ​​the lower receiving section (7) has a lower wall thickness thickening (9) for the lower receiving section (7), which lower wall thickness thickening (9) extends at least from the upper edge (5) of the first, lower housing element (2) to below the lower receiving section (7), and / or - the second, upper housing element (3) in the area of ​​the upper receiving section (8) has an upper wall thickness thickening for the upper receiving section (8), which upper wall thickness thickening extends at least from the lower edge (6) of the second, upper housing element (3) to above the upper receiving section (8), where - the lower wall thickness thickening (9) is formed by a lower partial joint sheet (12) connected to the first, lower housing element (2) by force and / or form and / or material connection, which extends along an entire longitudinal edge (21) of the upper edge (5), and / or that - the upper wall thickness thickening is formed by an upper partial joint sheet connected to the second, upper housing element (3) by force and / or form and / or material connection, which extends along an entire longitudinal edge (21) of the lower edge (6).

Description

[0001] The invention relates to a fluid machine with a divisible housing for a gearbox to be accommodated in the divisible housing, with at least one gearbox shaft, in particular a gearbox of a fluid machine.

[0002] Compressors, or fluid-compressing devices, are used in various industrial sectors for diverse applications involving the compression or compression of fluids, particularly (process) gases. Well-known examples include turbo compressors in mobile industrial applications, such as exhaust gas turbochargers or jet engines, and in stationary industrial applications, such as geared or geared turbo compressors for air separation.

[0003] In such a turbo compressor – which operates continuously – the pressure increase (compression) of the fluid is achieved by increasing the fluid's angular momentum from inlet to outlet through the rotation of a radially extending impeller. Here, i.e., in such a compressor stage, the pressure and temperature of the fluid increase, while the relative (flow) velocity of the fluid in the impeller decreases.

[0004] To achieve the highest possible pressure increase or compression of the fluid, several such compressor stages can be connected in series.

[0005] Turbo compressors are classified into radial and axial compressor designs.

[0006] In an axial compressor, the fluid to be compressed, for example, a process gas, flows through the compressor in a direction parallel to the axis (axial direction). In a radial compressor, the gas flows axially into the impeller of the compressor stage and is then deflected outwards (radially). In multi-stage radial compressors, this necessitates flow deflection after each stage.

[0007] Combined axial and radial compressor designs draw in large volume flows with their axial stages, which are then compressed to high pressures in the subsequent radial stages.

[0008] While single-shaft machines are most commonly used, in (multi-stage) geared turbo compressors (hereinafter referred to simply as geared compressors) the individual compressor stages are grouped around a large gear (hereinafter referred to simply as the large gear) mounted on a (large gear) shaft. One or more parallel (pinion) shafts, each carrying one or two impellers (turbo impellers arranged at the free ends of the pinion shafts) housed in spiral casings implemented as (outer) housing attachments, are driven by a large drive gear, i.e., the large gear, mounted in the housing (usually also referred to as a gearbox).

[0009] The spiral casings that house the impellers or guide the flow are attached to the outside of the housing or gearbox, usually by bolting, so that the impellers of such a geared compressor are located outside the housing or gearbox, whereas the actual gearbox of such a geared compressor is located inside the housing or gearbox.

[0010] For assembly reasons, the housing or gearbox of such a geared compressor is made in multiple parts, i.e., two (or possibly more) housing elements are (each) separated by / over a horizontal joint and arranged horizontally on top of each other - and screwed together.

[0011] In a typical configuration (for example, a four-stage geared compressor), two pinion shafts lie in a horizontal joint (formed by a lower gearbox housing and a horizontally arranged upper gearbox housing above it) with the large gear or its large gear shaft. This means that all three shafts – usually supported by bearings in corresponding bearing housings in the joint – lie in a common horizontal plane / level.

[0012] This arrangement results in four free shaft ends on the two pinion shafts, which – when fitted with turbo impellers housed in the spiral casings – (in this case) make it possible to create a multi-stage geared turbomachine with four possible process stages.

[0013] Such a geared compressor, for example a geared compressor from Siemens with the designation STC-GC, used for air separation, is known from http: / / www.energy.siemens.com / hq / de / verdichtung-expansionventilation / turboverdichter / getriebeturboverdichter / stc-gc.htm (available on 27.03.2016).

[0014] A gearbox housing is disclosed in US 1902934 A.

[0015] In a multi-stage geared compressor, especially for large volume flows, the spiral casings – which are bolted to the outside of the housing / gearbox – may be heavy, which, due to the high weight forces of the spiral casings – if they are bolted to the housing / gearbox – can deform the housing / gearbox – elastically or even plastically.

[0016] These housing deformations affect the bearing mounts for the (pinion / large gear) shafts of such a geared compressor, i.e., they shift and / or deform them, leading to inadequate gear contact patterns and edge support in the shaft bearings. Furthermore, the housing deformations and / or changes to the bearing mounts make it difficult or impossible to align the flow-carrying volute casings with the impellers, as well as to establish the tight gaps between rotating and stationary parts of such a geared compressor, which are characteristic of this type of compressor and crucial for its efficiency.

[0017] The invention is based on the objective of providing a fluid machine with a housing for a gearbox, in particular for a gearbox of a geared compressor, which improves upon the disadvantages of the prior art, in particular which allows only slight to no deformations under external loads, such as attachments mounted on the housing, such as spiral casings, and which is easy and inexpensive to implement and also easy and inexpensive to assemble.

[0018] The problem is solved by a fluid machine with a divisible housing for a gearbox to be accommodated in the divisible housing, with at least one gearbox shaft, having the features according to the independent patent claim.

[0019] Such a gearbox, which can be accommodated in the divisible housing, can, for example, be a gearbox of a fluid machine, such as a geared compressor, and may have a large gear shaft and at least one, preferably two, pinion shaft(s) meshing with a large gear arranged on the large gear shaft (example: four-stage geared compressor). Correspondingly larger-scale gearbox arrangements (for higher-stage geared compressors) with even more gear shafts or pinion shafts, for example six or eight pinion shafts, are possible. Multiple large gear shafts, each with one or more pinion shafts meshing with its large gears, are also possible.

[0020] The term "engaged" here can mean that the large gear and the pinion shaft have interlocking or meshing teeth. For example, the teeth can be straight, helical, or arc-cut.

[0021] The divisible housing has at least a first, lower housing element, for example a housing (gearbox) lower box, with a top edge and a second, upper housing element, for example a housing (gearbox) upper box or cover, with a bottom edge.

[0022] The upper edge of the first, lower housing element is connected to the lower edge of the second, upper housing element via a partial joint, which is essentially horizontal.

[0023] To put it simply and clearly, the second, upper housing element is arranged edge to edge, forming the horizontal joint, on the first, lower housing element, for example screwed (pinned and / or centered).

[0024] In the first, lower housing element, at least one lower receiving section is incorporated in the area of ​​its upper edge; in the second, upper housing element, at least one upper receiving section is incorporated in the area of ​​its lower edge.

[0025] The transmission shaft can be received in the at least one lower receiving section and the at least one upper receiving section, which together (with the second, upper housing element resting edge to edge on the first, lower housing element) can form a (bearing) receptacle for the transmission shaft.

[0026] In this context, such a (lower / upper) receiving section can be understood as a housing element section at the housing element edge that is open towards the joint, for example, essentially semicircular in shape, and is suitable for receiving a bearing component, for example, a bearing seat for a bearing ring or a bearing shell, or (directly) a bearing ring or a bearing shell, for supporting (and guiding) the transmission shaft, such as the large gear shaft or the pinion shaft.

[0027] The first, lower housing element has a lower wall thickness thickening in the area of ​​the lower receiving section, which lower wall thickness thickening extends at least from the upper edge of the first, lower housing element to below the lower receiving section.

[0028] Alternatively or in combination, the second, upper housing element has an upper wall thickness thickening in the area of ​​the upper receiving section, which upper wall thickness thickening extends at least from the lower edge of the second, upper housing element to above the upper receiving section.

[0029] In this context, such a (lower / upper) wall thickness thickening (of the housing element in the area of ​​the lower receiving section or in the area of ​​the upper receiving section) can be understood as a greater thickness / strength of the wall of the housing element compared to wall thicknesses / strengths of the housing element in other or below / above housing wall areas.

[0030] In simplified and more illustrative terms, it is intended that the housing element wall is reinforced "around the (lower and / or upper) receiving section" in the area of ​​the partial joint by additional material - similar to a bearing eye ("reinforced partial joint").

[0031] For example, the greater wall thickness of the housing element, or wall thickness increase, can be 120% or more, particularly 150% or more, than the wall thickness of the other housing wall areas. The transition from a thinner wall thickness to the increased wall thickness can be continuous or stepped.

[0032] This divisible housing is based on the finding – derived in particular from FE analyses and demonstrable there – that the essential deformation of a previous gearbox housing with attachments, such as the spiral housings arranged in the area of ​​the mounts on the housing elements, is a bulging (outwards) of the housing element walls – along the edges there (top edge of the lower housing element or top edge of the lower housing element) at the dividing joint.

[0033] Put simply, the deformation of a conventional gearbox housing is greatest in the horizontal plane at the level of the joint.

[0034] Whereas in previous housings the joint served "only" for the "oil-tight" screwing of the housing elements – and was therefore delicately designed – in the split housing, additional wall material is introduced in the area of ​​the (lower and / or upper) receiving section, thus reinforcing the housing element wall(s) ("structural stiffening"). This resulting stiffer structure of the housing element then deforms far less under the weight of attached components, such as (heavy) spiral casings.

[0035] The other areas of the housing element wall(s) can be constructed with standard wall thicknesses, as no further contribution to structural stiffness is to be expected there.

[0036] In a fluid machine, such as a turbine, a turbo compressor, in particular a multi-stage geared compressor or a pump, this split housing can be provided.

[0037] The divisible housing then contains a gearbox (of such a fluid machine or such a turbine / turbo compressor / multi-stage geared compressor / pump) with a large gear shaft and with at least one, preferably two, pinion shaft(s) engaged with a large gear arranged on the large gear shaft, for example on both sides of the large gear shaft, wherein the at least one, preferably two pinion shaft(s) and the large gear shaft are received in the receiving sections on the housing elements, in particular by means of bearings, in the dividing joint.

[0038] Other gear configurations – to be accommodated or already accommodated in the divisible housing – with possibly several large gear shafts (and corresponding multiple large gears), with which one or more pinion shafts can then engage, may be provided.

[0039] The advantages of the divisible housing thus apply to the fluid machine.

[0040] Preferred embodiments of the invention also arise from the dependent claims and relate to the divisible housing as well as to the fluid machine.

[0041] In a preferred embodiment, the lower wall thickness thickening extends from the upper edge (of the first, lower housing element) to a maximum of 50% or a maximum of 100%, in particular approximately 10% to 90% or approximately 20% to 80%, of a depth of the lower receiving section below the lower receiving section, and / or the upper wall thickness thickening extends from the lower edge (of the second, upper housing element) to a maximum of 50% or a maximum of 100%, in particular approximately 10% to 90% or approximately 20% to 80%, of a depth of the upper receiving section above the upper receiving section.

[0042] The depth of the recording section can be understood as the (maximum) distance of the point furthest from the edge of the housing element of the recording section.

[0043] Notwithstanding the above, it may also be advantageous to select the extent of the (lower / upper) wall thickness thickening below the lower receiving section or above the upper receiving section depending on the weight of a housing attachment to be fastened to the (lower / upper) housing element, in particular a spiral housing.

[0044] Put simply and clearly, the greater the weight forces acting on the housing element (especially those caused by external components), the greater the wall thickness (around the mounting area) can be. The same applies to the thickness of the wall thickening itself.

[0045] Furthermore, it may also be provided that the lower wall thickness thickening is formed by a lower partial joint sheet connected to the first, lower housing part by force-fit, form-fit, and / or material-fit connection. Similarly, it may also be provided that the upper wall thickness thickening is formed by an upper partial joint sheet connected to the second, upper housing part by force-fit, form-fit, and / or material-fit connection.

[0046] In particular, it is advantageous if the lower wall thickness thickening and / or the upper wall thickness thickening is formed by a welded-on partial joint plate. Such a partial joint plate can also be screwed on.

[0047] In a further preferred embodiment, a lower bearing seat for a bearing for the transmission shaft is incorporated into the lower wall thickening in the area of ​​the lower receiving section, and / or an upper bearing seat for a bearing for the transmission shaft is incorporated into the upper wall thickening in the area of ​​the upper receiving section. This eliminates the need for separate bearing seats, particularly those welded separately into the receiving sections, thereby reducing welding costs.

[0048] Furthermore, it may also be provided that in the first, lower housing element, in the area of ​​its upper edge, several lower receiving sections are provided, each for receiving a transmission shaft of the gearbox to be accommodated in the divisible housing, and / or that in the second, upper housing element, in the area of ​​its lower edge, several upper receiving sections are provided, each for receiving a transmission shaft of the gearbox to be accommodated in the divisible housing.

[0049] In simplified and more illustrative terms, several transmission shafts, such as one (or more) large gear shaft(s) and / or one (or more) pinion shafts, are arranged in the joint or in the receiving sections or receptacles in the housing elements.

[0050] It is particularly advantageous if a large gear shaft and at least two pinion shafts engaged with a large gear arranged on the large gear shaft are arranged in the parting line or in the receptacles there in the housing elements.

[0051] The first, lower housing element can then have several wall thickness thickenings in the area of ​​its upper edge, each for one of the several lower receiving sections, or the second, upper housing element can then have several wall thickness thickenings in the area of ​​its lower edge, each for one of the several upper receiving sections.

[0052] To put it simply and clearly, each (lower / upper) recording section is reinforced by the corresponding increase in wall thickness.

[0053] In a further preferred embodiment, it is provided that at least two of several lower wall thickness thickenings, which are formed side by side at the upper edge of the first, lower housing element, are connected to each other at least by force and / or form locking, in particular by material locking, or that at least two of several upper wall thickness thickenings, which are formed side by side at the lower edge of the second, upper housing element, are connected to each other at least by force and / or form locking, in particular by material locking.

[0054] In other words, to put it simply and clearly, adjacent wall thicknesses (at the edge) are connected to each other - thus stiffening the housing structure, especially at the edge(s) and the joint, to an even greater extent.

[0055] Furthermore, it may also be provided that the several lower wall thickness thickenings are designed such that they extend adjacent to one another, in particular at least force-fit and / or form-fit, in particular material-fit, along the upper edge of a lower longitudinal side of the first, lower housing element, in particular along the upper edge of the entire lower longitudinal side of the first, lower housing element, and / or that the several upper wall thickness thickenings are designed such that they extend adjacent to one another, in particular at least force-fit and / or form-fit, in particular material-fit, along the lower edge of an upper longitudinal side of the second, upper housing element, in particular along the lower edge of the entire upper longitudinal side of the second, upper housing element.

[0056] To put it simply and clearly, the (lower / upper) wall thickness thickenings run "continuously" along the entire (upper / lower) edge of the long side wall of the (first, lower / second, upper) housing element.

[0057] According to a further preferred embodiment, the first, lower, and the second, upper housing elements are a lower and upper housing of a two-part gearbox housing. It is also possible that, in the case of a three-part gearbox housing, the first, lower, and the second, upper housing elements are a lower and middle housing of the three-part gearbox housing, or that the first, lower, and the second, upper housing elements are a middle housing and an upper housing of the three-part gearbox housing.

[0058] Furthermore, it may also be provided that the first, lower housing element and the second, upper housing element are connected to each other by means of a force-fit connection via the lower wall thickness thickening and / or via the upper wall thickness thickening, in particular by means of screwing.

[0059] It may also be provided that housing attachments are mounted to the divisible housing, for example externally arranged flow-guiding components such as spiral housings, and / or spiral connections.

[0060] The preceding description of advantageous embodiments of the invention contains numerous features, some of which are summarized in the individual subclaims. However, it is advantageous for a person skilled in the art to also consider these features individually and combine them into meaningful further combinations.

[0061] The properties, features and advantages of this invention described above, as well as the manner in which they are achieved, will become clearer and more easily understood in connection with the following description of one or more exemplary embodiments, which will be explained in more detail in connection with the figures.

[0062] However, the invention is not limited to the combination of features specified in the embodiment(s), even with regard to functional features. Suitable features of each embodiment can also be explicitly considered in isolation, removed from one embodiment, and incorporated into another embodiment to complement it.

[0063] Functionally / structurally identical or identical elements or components have the same reference numerals in the exemplary embodiments or figures.

[0064] They show Fig. 1. A perspective view of a split housing comprising an upper box and a lower box for a gearbox of a multi-stage geared compressor. Fig. 2 Another view (perspective) of the split housing having an upper box and a lower box for a gearbox of a multi-stage geared compressor, Fig. 3 a view (top view) of the lower housing of the split housing comprising an upper housing and a lower housing for a gearbox of a multi-stage geared compressor and Fig. 4 a view of the course of a partial joint plate on an upper edge of the lower box of the split housing comprising an upper box and a lower box for a gearbox of a multi-stage geared compressor.

[0065] Exemplary embodiment: Gearbox housing with reinforced joint for a gearbox of a multi-stage geared compressor FIGS. 1 and 2 show (perspective) views of a (two-) split housing 1 (gearbox housing 1) with a lower box 2 and an upper box 3 for a gearbox (not shown) of a multi-stage geared compressor, which is intended for air separation. Fig. Figure 3 shows the lower box 2 of the housing 1 of the gear compressor in a top view. Fig. Figure 4 shows the course of a partial joint plate 9, 12 at an upper edge 5 of the lower box 2 of the housing 1 of the gear compressor.

[0066] The split housing 1 comprises the illustrated lower housing 2 and the illustrated upper housing 3 arranged above the lower housing 2 – all preferably made of steel – wherein the lower housing 2 and the upper housing 3 are connected to each other via a horizontal and unstepped joint 4. At the joint 4, the upper housing 3 rests edge to edge with its lower edge 6 on the upper edge 5 of the lower housing 2.

[0067] The lower box 2, as well as the upper box 3, of the housing 1 are approximately cuboid components or approximately rectangular in cross-section – each with two (longer) longitudinal sides / side walls 19 and two (shorter) transverse sides / side walls 20, or two (longer) longitudinal edges 21 and two (shorter) transverse edges 22. Thus, the two (longer) longitudinal edges 21 and the two (shorter) transverse edges 22 form the upper edge 5 (of the lower box 2) or the lower edge 6 (of the upper box 3), respectively, or their respective rectangular cross-sectional profiles.

[0068] The multi-stage geared compressor consists of four (compressor) stages, which are driven via a gearbox housed in the split casing 1. This gearbox comprises two large gear shafts and two pinion shafts (not shown), with each pinion shaft engaging with a large gear mounted on one of the large gear shafts. The two large gears themselves are also meshed with each other. The gearbox is driven by an electric motor (not shown) that drives one of the two large gears.

[0069] Turbo impellers (not shown) are arranged at the four free ends (located outside the housing 1) of the two pinion shafts and are housed in spiral housings (flow-guiding components, not shown) which are arranged externally with respect to the gearbox housing 1 and screwed to the lower box 2 (18, only indicated in the FIGS.).

[0070] The pinion shafts arranged on both sides of the large gear shafts, like the large gear shafts themselves, are received in the partial joint 4 by means of (four receptacles arranged side by side in the (longer) longitudinal edges 21 of the upper and lower edges 5, 6) and are supported and guided above them.

[0071] For this purpose, i.e., for receiving (bearing and guiding) the pinion shafts and the large gear shafts (in the parting line 4), as the FIGS show, four lower receiving sections 7 (in the form of approximately semicircular recesses 27) are provided in each of the two opposite (longer) longitudinal edges 21 of the upper edge 5 of the lower box 2; correspondingly, the four upper receiving sections 8 (also in the form of corresponding semicircular recesses 27) belonging to the lower receiving sections 7 are provided in each of the two opposite (longer) longitudinal edges 21 of the lower edge 6 of the upper box 3.

[0072] Thus, a lower receiving section 7 in one of the two longitudinal edges 21 of the upper edge 5 of the lower housing 2 and a corresponding upper receiving section 8 in the corresponding one of the two longitudinal edges 21 of the lower edge 6 of the upper housing 3, as well as a corresponding lower receiving section 7 in the other of the two longitudinal edges 21 of the upper edge 5 of the lower housing 2 and a corresponding upper receiving section 8 in the corresponding other of the two longitudinal edges 21 of the lower edge 6 of the upper housing 3, each receive one of the (gear) shafts.

[0073] As further shown in the FIGS, in the lower box 2 of the gearbox housing 1 - in the area of ​​its upper edge 5, specifically at the two (longer) longitudinal edges 21 - a reinforcement of the wall areas or edge areas is provided.

[0074] This is realized, as the FIGS show, by means of a welded first 9, 12, 24 (for one of the two (longer) longitudinal edges 21) and second (for the other of the two (longer) longitudinal edges 21) dividing sheet 9, 12, 25.

[0075] This first and second partial joint sheet 9, 12, 24 and 25 is (in its respective thickness) each approximately twice as thick as the wall thicknesses of the underlying (wall) areas of the lower box 2, (and thus forms a step / edge 26 in the transition to these) and extends - with different depths 11 (seen from the upper edge 5 of the lower box 2) - along the entire respective (longer) longitudinal edge 21.

[0076] As FIGS. 1, 2 and 4 in particular illustrate, this first and second partial joint plate 9, 12, 24 and 25 respectively extends downwards (“depth” 11) from the upper edge 5 of the lower box 2, specifically – in areas adjacent to and between the lower receiving sections 7 – from the upper edge 5 of the lower box 2 to approximately 15% to 30% of the depth 11 of a lower receiving section 7 located there below the lower receiving section 7. In areas at the lower receiving sections 7, this first and second partial joint plate 9, 12, 24 and 25 respectively extends from the upper edge 5 of the lower box 2 to approximately 75% to 100% of the depth 11 of a lower receiving section 7 located there below the lower receiving section 7.

[0077] In simpler and more descriptive terms, the lower edge 26 of the first or second partial joint sheet 9, 12, 24 or 25 follows approximately the “actual” (i.e., taking into account the recesses 27 of the receiving sections 7, 8) course of the upper edge 5 of the lower box 2 or the course of the respective (longer) longitudinal edge 21 of the upper edge 5 (cf. Fig. 4).

[0078] The depth 11 of the first or second partial joint sheet 9, 12, 24 or 25 is designed as follows (see Fig. 4) that bearing seats 14 for the bearings of the transmission shafts are machined directly from the first or second partial joint plate 9, 12, 24 or 25. With a welded construction of the first or second partial joint plate 9, 12, 24 or 25, this eliminates the need for separate welded bearing plates (for the bearing seats), thus reducing welding costs. The reinforced first or second partial joint plate 9, 12, 24 or 25 is therefore almost cost-neutral, even though the raw part weight is higher.

[0079] A corresponding first and second partial joint sheet 9, 12, 24 or 25, as for the lower box 2 of the housing 1, can also be provided for its upper box 3 - there on the two (longer) longitudinal edges 21 of the lower edge 6 (not shown).

[0080] By using these structurally reinforcing partial joint plates 9, 12, 24, and 25 ("reinforced partial joint"), a rigid structure is created for the housing 1, and in particular its lower housing 2, in a simple and cost-effective manner. This rigid structure minimizes deformation under the weight of heavy, flow-guiding components attached to the housing 1. Particularly in the area of ​​the opening of the housing 1 or gearbox 1, these structurally reinforcing partial joint plates 9, 12, 24, and 25 provide high rigidity, especially in the horizontal plane.

[0081] If the housing 1 or gearbox 1 achieves this high stiffness, particularly at the joint 4, through this reinforced joint 4, then negative housing deformations that negatively affect the bearing mounts for the (pinion / large gear) shafts of such a geared compressor can be counteracted. This means that the bearing mounts no longer shift or deform, or hardly at all – and thus no longer lead to inadequate gear contact patterns and edge wear in the shaft bearings. Furthermore, the housing deformations and the changes to the bearing mounts avoided by the reinforced joint 4 enable the alignment of the flow-guiding spiral casings with the impellers, as well as the adjustment of narrow gaps between rotating and stationary parts of such a geared compressor, which are characteristic of this type of compressor and extremely important for its efficiency.

[0082] Although the invention has been illustrated and described in detail by the preferred embodiment(s), the invention is not limited by the disclosed examples and other variations can be derived by a person skilled in the art without leaving the scope of protection of the invention.

Claims

[1] Fluid machine, in particular a turbine, turbocompressor, multi-stage geared compressor or pump, with a divisible housing (1) with a gear accommodated in the divisible housing (1) with a large gear shaft and with at least one, preferably two, pinion shaft or pinion shafts engaging with a large gear arranged on the large gear shaft, wherein the pinion shaft or pinion shafts and the at least one large gear shaft are accommodated in a receiving section (7, 8) on the housing elements (2, 3), in particular by means of bearings, in a parting joint (4), wherein the divisible housing (1) is designed for a gear with at least one gear shaft, wherein the divisible housing (1) - with at least a first, lower housing element (2) with an upper edge (5) and a second, upper housing element (3) with a lower edge (6), wherein the upper edge (5) of the first, lower housing element (2) is connected to the lower edge (6) of the second, upper housing element (3) via a parting joint (4), - in the first, lower housing element (2) in the region of its upper edge (5) at least one lower receiving section (7) and in the second, upper housing element (3) in the region of its lower edge (6) at least one upper receiving section (8) are introduced, wherein the gear shaft can be received in the at least one lower receiving section (7) and the at least one upper receiving section (8), wherein - the first, lower housing element (2) has, in the region of the lower receiving section (7), a lower wall thickness thickening (9) for the lower receiving section (7), which lower wall thickness thickening (9) extends at least from the upper edge (5) of the first, lower housing element (2) to below the lower receiving section (7), and / or - the second, upper housing element (3) has, in the region of the upper receiving section (8), an upper wall thickness thickening for the upper receiving section (8), which upper wall thickness thickening extends at least from the lower edge (6) of the second, upper housing element (3) to above the upper receiving section (8), where - the lower wall thickness thickening (9) is formed by a lower partial joint plate (12) which is connected to the first, lower housing element (2) in a force-fitting and / or form-fitting and / or material-fitting manner and which extends along an entire longitudinal edge (21) of the upper edge (5), and / or that - the upper wall thickness thickening is formed by an upper partial joint plate which is connected to the second, upper housing element (3) in a force-fitting and / or form-fitting and / or material-fitting manner and which extends along an entire longitudinal edge (21) of the lower edge (6). [2] Fluid machine according to the preceding claim, characterized by , that the lower wall thickness thickening (9) extends from the upper edge (5) to at most 50% or at most 100%, in particular approximately 10% to 90% or approximately 20% to 80%, of a depth (11) of the lower receiving section (7) below the lower receiving section (7) and / or that the upper wall thickness thickening extends from the lower edge (6) to at most 50% or at most 100%, in particular approximately 10% to 90% or approximately 20% to 80%, of a depth (11) of the upper receiving section (7) above the upper receiving section (8). [3] Fluid machine according to at least one of the preceding claims, characterized by that a lower bearing seat (14) for a bearing for the gear shaft is incorporated into the lower wall thickness thickening (9) in the region of the lower receiving section (7) and / or that an upper bearing seat for a bearing for the gear shaft is incorporated into the upper wall thickness thickening in the region of the upper receiving section (8). [4] Fluid machine according to at least one of the preceding claims, characterized by , that in the first, lower housing element (2) in the region of its upper edge (5), a plurality of lower receiving sections (7) are each introduced for receiving a gear shaft of the gear unit which can be accommodated in the divisible housing (1) and / or that in the second, upper housing element (3) in the region of its lower edge (6) a plurality of upper receiving sections (8) are introduced, each for receiving a gear shaft of the gear that can be accommodated in the divisible housing (1). [5] Fluid machine according to at least one of the preceding claims, characterized by , that the first, lower (2) and the second, upper housing element (3) are a lower box (2) and an upper box (3) of a two-part gear housing (1) and / or that the first, lower (2) and the second, upper housing element (3) are a lower box (2) and a middle box or a middle box and an upper box (3) of a three-part gear housing (1). [6] Fluid machine according to at least one of the preceding claims, characterized by that the first, lower housing element (2) and the second, upper housing element (3) are connected to one another in a force-fitting manner, in particular by screwing (18), via the lower wall thickness thickening (9) and / or via the upper wall thickness thickening.

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