Geared compressor

Abstract

To suppress the deformation of a casing.SOLUTION: A geared compressor includes a rotary shaft, a gear housing storing a gear for driving the rotary shaft to be rotated in the peripheral direction, an impeller fixed to the end of the rotary shaft protruding from the gear housing in the axial direction and formed in a disc shape around the axial line, a casing fixed to the gear housing, internally storing the impeller, and having a discharge space formed inside for fluid compressed by the impeller to be supplied thereinto, and a restriction member fixed to at least one of the gear housing and the casing at its lower side in the vertical direction with respect to the impeller for restricting the displacement of the casing to come close to the gear housing in the axial direction.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a geared compressor. Background Art

[0002] A centrifugal compressor is known as a device for compressing fluid to generate compressed fluid. As one type of centrifugal compressor, a geared compressor that stepwise compresses fluid with a plurality of impellers via a plurality of gears is known. For example, Patent Document 1 discloses a geared compressor including a rotatable impeller fixed to a rotating shaft, and a casing having an accommodation space for accommodating the impeller. Prior Art Literature Patent Literature

[0003] Patent Document 1 Japanese Unexamined Patent Application Publication No. 2018-168759 Summary of the Invention Problem to be Solved by the Invention

[0004] Incidentally, in order to improve the performance of a geared compressor, when the diameter of the impeller is increased, an increase in the amount of fluid discharged from the impeller makes it necessary to increase the size of the discharge destination space. For this reason, the discharge scroll, which is a part of the casing and internally forms the discharge destination space, also increases in size. Along with this, the self-weight of the discharge scroll increases. The increase in the self-weight of the discharge scroll may cause deformation of the portion of the casing connecting the casing body that accommodates the impeller and the discharge scroll. In particular, below the rotating shaft in the vertical direction, the influence of the self-weight of the discharge scroll is large, and there is a possibility that the discharge scroll deforms so as to collapse in the axial direction. The deformation of the discharge scroll changes the shape of the casing, and also changes the clearance between the impeller and the casing.

[0005] This disclosure was made to solve the above problems and aims to provide a geared compressor that can suppress deformation of the casing. [Means for solving the problem]

[0006] To solve the above problems, the geared compressor according to the present disclosure comprises: a rotating shaft extending in the axial direction in which the axis extends, with respect to the axis; a gear housing that houses a gear for rotating the rotating shaft in the circumferential direction about the axis; an impeller fixed to the end of the rotating shaft protruding from the gear housing in the axial direction and formed in the shape of a disc with respect to the axis; a casing body fixed to the gear housing and housing the impeller inside; a discharge scroll connected to the casing body radially outward with respect to the axis and positioned away from the gear housing in the axial direction, with a discharge space formed inside to which the fluid compressed by the impeller is supplied; and a regulating member fixed to at least one of the gear housing and the discharge scroll vertically below the impeller, which restricts the displacement of the casing body toward the discharge scroll in the axial direction. The regulating member comprises a first member fixed to one of the gear housing and the discharge scroll, and a second member fixed to the other of the gear housing and the discharge scroll, wherein the first member has a first surface facing the second member in the axial direction, and the second member has a second surface facing the first surface in the axial direction, the gap between the first surface and the second surface is narrowest in the axial direction between the first and second members, the first member has a first through hole through which a bolt can be inserted, and the second member has a second through hole through which the bolt can be inserted, and the first through hole is formed to communicate with the second through hole when the first surface and the second surface are in close proximity. . [Effects of the Invention]

[0007] According to the geared compressor of this disclosure, deformation of the casing can be suppressed. [Brief explanation of the drawing]

[0008] [Figure 1] This is a cross-sectional view along the axis of the geared compressor, showing the schematic configuration of the geared compressor according to the embodiment of this disclosure. [Figure 2] This is a view of the regulating member provided in the geared compressor shown in Figure 1, as seen from the circumferential direction. [Figure 3] This is a view of the regulating member in Figure 2, seen from the inside in the radial direction. [Figure 4] This figure shows the regulating member in Figure 2 set between the gear housing and the casing. [Figure 5] This is a view of a regulating member provided in a geared compressor according to a first modified embodiment of the present disclosure, as seen from the radially inner side. [Figure 6] This is a view from the circumferential direction of a regulating member provided in a geared compressor according to a second modified embodiment of the present disclosure. [Figure 7] This is a view of the regulating member in Figure 6, seen from the inside in the radial direction. [Modes for carrying out the invention]

[0009] The following describes embodiments for implementing the geared compressor according to this disclosure with reference to the attached drawings. However, this disclosure is not limited to these embodiments.

[0010] (Configuration of a geared compressor) As shown in Figure 1, the geared compressor 1 as a rotating machine according to this embodiment mainly comprises a rotor 3, a speed-increasing transmission unit 11, a gear housing 2, a casing 5, and a regulating member 7A.

[0011] (Rotor configuration) The rotor 3 is rotatable about axis O relative to the gear housing 2. The rotor 3 comprises a rotating shaft 30 and an impeller 40.

[0012] The rotating shaft 30 extends in the axial direction Da along the axis O, with the axis O as its center. As shown in Figure 1, the rotating shaft 30 is supported by the gear housing 2 and casing 5 so as to be rotatable around the axis O by a pair of radial bearings 12. The pair of radial bearings 12 are spaced apart in the axial direction Da. The pair of radial bearings 12 are positioned spaced apart on both sides of the pinion gear 15, which will be described later, in the axial direction Da.

[0013] The rotating shaft 30 is connected to an external drive source (not shown), such as a motor, via a speed-increasing transmission unit 11. The speed-increasing transmission unit 11 is housed in a gear housing 2. The speed-increasing transmission unit 11 comprises a pinion gear 15 and a large-diameter gear 16. The pinion gear 15 is fixed to the rotating shaft 30 between a pair of radial bearings 12 and inside the gear housing 2. The large-diameter gear 16 meshes with the pinion gear 15 inside the gear housing 2. The large-diameter gear 16 is rotationally driven by the drive source. The large-diameter gear 16 has a larger outer diameter than the pinion gear 15. Therefore, the rotational speed of the rotating shaft 30 to which the pinion gear 15 is fixed is greater than the rotational speed of the large-diameter gear 16. In other words, the speed-increasing transmission unit 11 transmits the rotational speed of the large-diameter gear 16, driven by an external drive source, to the rotating shaft 30 via the pinion gear 15.

[0014] The impellers 40 are positioned at both ends of the rotation shaft 30 in the axial direction Da. In this embodiment, each impeller 40 is a so-called open impeller, comprising a disk 41 and blades 42. However, the impellers 40 may also be closed impellers with covers.

[0015] The disk 41 is disc-shaped and fixed to the rotating shaft 30. The disk 41 has a first disk surface 41a facing the first side Da1 in the axial direction Da, and a second disk surface 41b facing the opposite side of the first disk surface 41a in the axial direction Da. The second disk surface 41b is the back surface of the impeller 40. In this embodiment, the geared compressor 1 is equipped with one impeller 40 at each end of the rotating shaft 30 in the axial direction Da. Each impeller 40 is positioned so that the second disk surface 41b, which is the back surface of the disk 41, faces the pinion gear 15 in the axial direction Da, and the first disk surface 41a faces the end of the rotating shaft 30 opposite to the pinion gear 15. In other words, the first stage impeller 40A, located at the first end of the rotating shaft 30, and the second stage impeller 40B, located at the second end of the rotating shaft 30, have their disks 41 facing each other in opposite directions along the axial direction Da.

[0016] In the following description, for each impeller 40, the first disk surface 41a side of the disk 41 is defined as the first side Da1 in the axial direction Da, and the second disk surface 41b side is defined as the second side Da2 in the axial direction Da. That is, the side where the end portion of the rotating shaft 30 is located relative to the impeller 40 is the first side Da1 in the axial direction Da. Further, the side where the gear housing 2 is disposed relative to the impeller 40 is the second side Da2 in the axial direction Da. In other words, for the first-stage impeller 40A and the second-stage impeller 40B, the first side Da1 in the axial direction Da and the second side Da2 in the axial direction Da face opposite directions to each other.

[0017] The blades 42 extend from the first disk surface 41a toward a suction port 512a of a casing 5 described later. A plurality of the blades 42 are arranged at intervals in a circumferential direction Dc around the axis O.

[0018] In each impeller 40, an impeller flow path 45 is formed by the disk 41 and the blades 42. The impeller flow path 45 has an inflow port 45i and an outflow port 45o. The inflow port 45i opens toward the first side Da1 in the axial direction Da at an inner side Dri in the radial direction Dr of the impeller 40. Here, the radial direction Dr is a radial direction centered on the axis O. The outflow port 45o opens toward an outer side Dro in the radial direction Dr at the outer side Dro in the radial direction Dr of the impeller 40. The working fluid is compressed while flowing from the inflow port 45i toward the outflow port 45o of the impeller flow path 45. The working fluid flows relative to the impeller 40 from the inner side Dri in the radial direction Dr and the first side Da1 in the axial direction Da toward the outer side Dro in the radial direction Dr and the second side Da2 in the axial direction Da.

[0019] (Configuration of Gear Housing) The gear housing 2 is formed to cover a portion of the rotor 3. Both ends of the rotating shaft 30 in the axial direction Da protrude from the gear housing 2 on both sides of the axial direction Da. The impellers 40, each positioned at both ends of the rotating shaft 30 in the axial direction Da, are positioned to protrude from the gear housing 2 on both sides of the axial direction Da. The gear housing 2 is made of metal and houses the radial bearing 12, the pinion gear 15, and the large-diameter gear 16. The gear housing 2 is fixed on the mounting surface F of the foundation.

[0020] The gear housing 2 is designed to be divisible into upper and lower parts in the vertical direction Dv, with a virtual horizontal plane passing through the axis O serving as the dividing surface. The gear housing 2 comprises a lower gear housing 21 and an upper gear housing 22.

[0021] The lower gear housing 21 is fixed to the mounting surface F in an immovable state. The lower gear housing 21 is positioned downward Dvd in the direction Dv perpendicular to the axis O. The lower gear housing 21 has higher rigidity than the upper gear housing 22. For example, the lower gear housing 21 is made of a material or structure that is less prone to deformation than the upper gear housing 22. The lower gear housing 21 of this embodiment includes a lower gear housing body 23, a bearing support portion 24, and a lower casing support portion 27.

[0022] The lower gear housing body 23 has an opening 21a that opens upward Dvu in the vertical direction Dv and recesses downward Dvd. The large diameter gear 16, the lower part of the pinion gear 15, and the lower part of the pair of radial bearings 12 are housed inside the opening 21a. In other words, the lower gear housing body 23 covers the large diameter gear 16, the lower part of the pinion gear 15, and the pair of radial bearings 12 from downward Dvd in the vertical direction Dv. The lower gear housing body 23 of this embodiment has a pair of side wall portions 231 and a circumferential wall portion 232. The pair of side wall portions 231 are arranged parallel to each other at a predetermined distance in the axial direction Da. The pair of side wall portions 231 are arranged apart in the axial direction Da from the large diameter gear 16 so as to sandwich the large diameter gear 16 from the axial direction Da.

[0023] The peripheral wall portion 232 is formed to cover the lower parts of the large-diameter gear 16 and the pinion gear 15 from the outer side in the radial direction Dr around the axis O. The peripheral wall portion 232 is formed to cover the pair of side wall portions 231 together in the axial direction Da to They are connected. The peripheral wall portion 232 extends in the circumferential direction Dc centered on the axis O. When viewed from the axial direction Da, the peripheral wall portion 232 is formed, for example, in a plate shape.

[0024] The bearing support portion 24 supports the radial bearing 12 from below Dvd in the vertical direction Dv. The bearing support portion 24 extends from the side wall portion 231 to above Dvu in the vertical direction Dv. In other words, the bearing support portion 24 is formed integrally with the lower gear housing body 23. The bearing support portion 24 has a pair of bearing support portions 24a and 24b. The pair of bearing support portions 24a and 24b each support a pair of radial bearings 12. The pair of bearing support portions 24a and 24b are spaced apart in the axial direction Da.

[0025] The lower casing support portion 27 is fixed to the casing 5. The lower casing support portion 27 is formed integrally with the bearing support portion 24. The lower casing support portion 27 is connected to the first side Da1 in the axial direction Da with respect to the bearing support portion 24. The lower casing support portion 27 of this embodiment has a pair of lower casing support portions 27a and 27b. The pair of lower casing support portions 27a and 27b are arranged parallel to each other with a gap in the axial direction Da. The pair of lower casing support portions 27a and 27b have an L-shaped cross-section and extend from the bearing support portion 24. Each of the pair of lower casing support portions 27a and 27b has a shaft insertion hole 27h through which the rotating shaft 30 is inserted. The shaft insertion hole 27h is formed to penetrate each of the pair of lower casing support portions 27a and 27b in the axial direction Da.

[0026] The upper gear housing 22, together with the lower gear housing 21, houses the large-diameter gear 16 and the pinion gear 1 5、and covers a pair of radial bearings 12. The upper gear housing 22 is positioned Dvu above the vertical direction Dv with respect to the axis O. The upper gear housing 22 is fixed to the lower gear housing 21 by bolts (not shown) or the like. In other words, the upper gear housing 22 is detachably attached to the lower gear housing 21 while being positioned Dvu above the vertical direction Dv with respect to the lower gear housing 21. The upper gear housing 22 of this embodiment has an upper cover 28 and an upper gear housing body 29.

[0027] The upper cover 28 has a recess 28a that is recessed upward. The upper part of the pinion gear 15 is housed inside the recess 28a. The upper cover 28 in this embodiment extends in the circumferential direction Dc about the axis O, and when viewed from the axial direction Da, it is formed in a semi-circular arc shape, for example.

[0028] An upper opening 28b is formed in the upper part of the upper cover 28. The upper gear housing body 29 is positioned to close the upper opening 28b of the upper cover 28. The upper gear housing body 29 is formed to cover the upper part of the pinion gear 15 from the outer side Dro in the radial direction Dr around the axis O. The upper gear housing body 29 is detachable from the upper cover 28 by bolts (not shown) or the like.

[0029] (Casing configuration) The casing 5 is positioned on both outer sides in the axial direction Da relative to the gear housing 2. The casing 5 has a first-stage casing 5A that houses the first-stage impeller 40A and a second-stage casing 5B that houses the second-stage impeller 40B.

[0030] Each casing 5 is fixed to the gear housing 2. Each casing 5 houses an impeller 40 and forms a discharge space inside to which a working fluid (fluid, such as air) compressed by the impeller 40 is supplied. In this embodiment, each casing 5 has a casing body 51 and a discharge scroll 52.

[0031] The casing body 51 houses the impeller 40 inside. The casing body 51 has a casing base 511 and a nozzle portion 512.

[0032] A space capable of accommodating the impeller 40 is formed inside the casing base 511. The casing base 511 is fixed to the lower casing support portion 27 of the gear housing 2 via bolts (not shown) or the like. A casing shaft insertion hole 511h is formed in the center of the casing base 511 through which the rotating shaft 30 is inserted.

[0033] Inside the nozzle section 512, there is a suction port 512a, which is a space through which the working fluid supplied to the impeller 40 flows. The nozzle section 512 is The nozzle portion 512 extends from the casing base 511 in the axial direction Da. The nozzle portion 512 is positioned on the first side Da1 in the axial direction Da relative to the casing base 511. The nozzle portion 512 is formed in a cylindrical shape with axis O. The nozzle portion 512 is formed such that the diameter dimension (flow channel cross-section as viewed from the axial direction Da) with respect to axis O gradually decreases from the first side Da1 in the axial direction Da to the second side Da2. At the end of the nozzle portion 512 on the first side Da1 in the axial direction Da, a flange portion 513 is formed that expands in diameter outward in the radial direction Dr. A pipe 90 that supplies working fluid into the casing 5 is connected to this flange portion 513 via bolts (not shown), etc. As a result, working fluid flows into the nozzle portion 512 from the pipe 90. As the impeller 40 rotates in the circumferential direction Dc around the axis O, the working fluid is drawn into the casing 5 from the outside through the suction port 512a.

[0034] The discharge scroll 52 is connected to the outer diameter Dr of the casing body 51. The discharge scroll 52 is formed to extend outward in the radial direction Dr beyond the lower casing support portion 27. The discharge scroll 52 extends in the circumferential direction Dc. Furthermore, the discharge scroll 52 of the first stage casing 5A, which houses the first stage impeller 40A, is formed to have a larger diameter (larger in the radial direction Dr) than the discharge scroll 52 of the second stage casing 5B, which houses the second stage impeller 40B. Inside the discharge scroll 52 of this embodiment, an exhaust passage 525 and a discharge space 52s are formed.

[0035] The exhaust passage 525 allows the working fluid compressed by the impeller 40 to flow out into the discharge space 52s. The exhaust passage 525 is formed radially outward in Dr relative to the outlet 45o of the impeller passage 45. When viewed from the circumferential direction Dc, the exhaust passage 525 is a passage that extends radially in Dr.

[0036] The discharge space 52s allows the working fluid that has flowed through the exhaust passage 525 to flow out to the outside. In other words, the fluid compressed by the impeller 40 is supplied to the discharge space 52s. The discharge space 52s is in communication with the exhaust passage 525 at the outer Dro in the radial direction Dr. The discharge space 52s is formed in a spiral shape that is continuous in the circumferential direction Dc. The cross-sectional area of ​​the discharge space 52s is formed to gradually decrease toward the discharge port (not shown) connected to the outside of the casing 5. The working fluid is further compressed as it swirls around the circumferential direction Dc along the discharge space 52s before being discharged from the discharge port.

[0037] In this embodiment, the discharge scroll 52 and the gear housing 2 are spaced apart in the axial direction Da. More specifically, in this embodiment, the discharge scroll 52 and the lower gear housing body 23, and the discharge scroll 52 and the upper gear housing body 29 are spaced apart in the axial direction Da, while their positions in the vertical direction Dv overlap. In other words, the discharge scroll 52 and the lower gear housing body 23 are spaced apart in the axial direction Da such that a space S is formed between them.

[0038] (Configuration of regulating members) The restricting member 7A restricts the displacement of the casing 5 toward the gear housing 2 in the axial direction Da. The restricting member 7A is located in the space S between the discharge scroll 52 and the gear housing 2. In this embodiment, the restricting member 7A is located in the space S between the discharge scroll 52 of the first stage casing 5A, which houses the first stage impeller 40A, and the gear housing 2. Therefore, the restricting member 7A restricts the displacement of the gear housing 2 toward the second side Da2 in the axial direction Da of the discharge scroll 52 of the first stage casing 5A.

[0039] The restricting member 7A is fixed to at least one of the gear housing 2 and the casing 5 below the impeller 40 in the vertical direction Dv. In this embodiment, the restricting member 7A is positioned to overlap with the lower gear housing 21 when viewed from the axial direction Da. In particular, the restricting member 7A in this embodiment is positioned to overlap with the wall portion forming the outer peripheral end 52e of the radial Dr outer Dro of the discharge scroll 52 when viewed from the axial direction Da. Furthermore, only one restricting member 7A is provided in the geared compressor 1.

[0040] As shown in Figures 2 and 3, the regulating member 7A comprises a first member 70A fixed to one of the gear housing 2 and the casing 5, and a second member 80A fixed to the other of the gear housing 2 and the casing 5.

[0041] The first member 70A is fixed to the lower gear housing 21. In this embodiment, the first member 70A is fixed to the lower gear housing body 23. More specifically, the first member 70A is fixed to the side wall portion 231 near the first stage impeller 40A. In this embodiment, the first member 70A comprises a first base portion 71A and a pair of circumferential regulating portions 72A.

[0042] The first base portion 71A is fixed to the outer surface of the side wall portion 231 facing the first side Da1 in the axial direction Da without any gaps by bolts (not shown). The first base portion 71A is formed in a plate shape that extends along a virtual plane perpendicular to the axial direction Da. When viewed from the vertical direction Dv, the first base portion 71A is formed thicker near the center in the circumferential direction Dc so that it forms a convex shape that protrudes toward the first side Da1 in the axial direction Da.

[0043] As shown in Figure 3, the circumferential restricting portion 72A restricts the relative displacement of the second member 80A with respect to the first member 70A in at least one direction in the circumferential direction Dc. In this embodiment, the pair of circumferential restricting portions 72A restrict the relative displacement of the second member 80A with respect to the first member 70A in the circumferential direction Dc to both sides. The pair of circumferential restricting portions 72A are arranged at a predetermined interval in the circumferential direction Dc. The pair of circumferential restricting portions 72A protrude from the first base portion 71A toward the second member 80A on the first side Da1 in the axial direction Da. When viewed from the vertical direction Dv, each of the circumferential restricting portions 72A extends in a rectangular cross-section from near the center of the circumferential direction Dc in the first base portion 71A. Each of the pair of circumferential restricting portions 72A extends in the radial direction Dr to It extends. As a result, between the pair of circumferential restricting portions 72A in the circumferential direction Dc, when viewed from the vertical direction Dv, the axial direction Da to A recessed groove 72m is formed. The groove 72m is between a pair of circumferential restricting portions 72A, and in the radial direction Dr to They are formed to be interconnected.

[0044] Furthermore, each of the pair of circumferential restricting portions 72A has a first through hole 72h. Each first through hole 72h penetrates the circumferential restricting portion 72A in the circumferential direction Dc.

[0045] Furthermore, the first member 70A has a first surface 71f facing the second member 80A in the axial direction Da. In this embodiment, the first surface 71f is formed on the first base portion 71A. More specifically, the first surface 71f is a plane that forms the bottom surface of the groove 72m when viewed from the vertical direction Dv. In other words, the first surface 71f is a plane that faces the first side Da1 in the axial direction Da between the pair of circumferential restricting portions 72A.

[0046] The second member 80A is fixed to the discharge scroll 52. The second member 80A is positioned such that its radial Dr position overlaps with that of the first member 70A. Furthermore, in this embodiment, the second member 80A is positioned such that its axial Da position partially overlaps with that of the first member 70A. The second member 80A comprises a second base portion 81A and a second projection portion 82A.

[0047] The second base portion 81A is fixed to the discharge scroll 52, on the outer surface facing the second side Da2 in the axial direction Da, by bolts (not shown) or the like, without any gaps. The second base portion 81A is formed in a plate shape that extends along a virtual plane perpendicular to the axial direction Da.

[0048] The second projection 82A protrudes from the second base portion 81A toward the first member 70A towards the second side Da2 in the axial direction Da. When viewed from the vertical direction Dv, the second projection 82A protrudes from the second base portion 81 A The second projection 82A extends in a rectangular cross-section from near the center of the circumferential direction Dc. The second projection 82A extends in the radial direction Dr. The second projection 82A is positioned between a pair of circumferential restricting portions 72A in the circumferential direction Dc. Here, as shown in Figure 2, the length L2 of the second projection 82A in the axial direction Da is greater than the length L1 (depth of the groove 72m) of the pair of circumferential restricting portions 72A in the axial direction Da.

[0049] Furthermore, the second member 80A has a second surface 82f that faces the first member 70A in the axial direction Da. In this embodiment, the second surface 82f is formed at the tip of the second side Da2 in the axial direction Da of the second projection 82A. In other words, the second surface 82f is a plane that faces the second side Da2 in the axial direction Da of the second projection 82A. The second surface 82f faces the first surface 71f in the axial direction Da.

[0050] Here, when the geared compressor 1 is not operating, the first surface 71f and the second surface 82f are separated by a gap Z defined in the axial direction Da. The gap Z between the first surface 71f and the second surface 82f is narrowest in the axial direction Da at the first member 70A and the second member 80A.

[0051] Furthermore, the thickness D1 of the second projection 82A in the circumferential direction Dc is formed to be smaller than the distance D2 between the pair of circumferential restricting portions 72A in the circumferential direction Dc. In addition, the distance between the pair of circumferential restricting portions 72A and the second projection 82A in the circumferential direction Dc is formed to be larger than the gap Z between the first surface 71f and the second surface 82f in the axial direction Da. When the geared compressor 1 is not operating, the second projection 82A is formed to maintain a predetermined gap in the circumferential direction Dc with respect to both of the pair of circumferential restricting portions 72A.

[0052] Furthermore, the second projection 82A has a second through-hole 82h. The second through-hole 82h penetrates the second projection 82A in the circumferential direction Dc. As shown in Figure 4, the first through-hole 72h of the pair of circumferential restricting portions 72A is formed to communicate with the second through-hole 82h of the second projection 82A when the first surface 71f and the second surface 82f are in close proximity (when the first surface 71f and the second surface 82f are in contact).

[0053] (Assembly procedure for regulatory components) Next, the method for attaching the regulating member 7A to the gear housing 2 and casing 5 as described above will be explained. Firstly, before attaching it to the gear housing 2 and casing 5, the regulating member 7A is pre-assembled, with the first member 70A and the second member 80A being assembled as shown in Figure 4. Specifically, the first member 70A and the second member 80A are temporarily fastened together with a bolt 201 and a nut 202. During temporary fastening, the bolt 201 is inserted through the second through hole 82h of the second projection 82A and the first through hole 72h of the pair of circumferential regulating parts 72A, and the nut 202 is fastened to the tip of the bolt.

[0054] Next, the first member 70A and the second member 80A, which are fixed (temporarily fastened) by bolts 201 and nuts 202, are inserted between the gear housing 2 and the casing 5. Then, the first base portion 71A is fixed to the side wall portion 231, for example, by bolts (not shown).

[0055] After fixing the first base portion 71A to the side wall portion 231, the bolts 201 and nuts 202 are removed. Then, a shim (not shown) is inserted between the second base portion 81A of the second member 80A and the casing 5 to adjust the gap Z between the first surface 71f and the second surface 82f to be within a predetermined numerical range. After the adjustment of the gap Z is complete, the second base portion 81A is fixed to the casing 5, for example, by bolts (not shown).

[0056] In this way, the first member 70A and the second member 80A, with their gap Z adjusted, are attached to the gear housing 2 and the casing 5.

[0057] (Effects and Benefits) In the geared compressor 1 with the above configuration, the gear housing 2 and casing 5 are equipped with a restricting member 7A fixed below the impeller 40 in the vertical direction Dv. As shown in Figure 1, in a geared compressor 1 equipped with such a restricting member 7A, the discharge scroll 52 may deform by tilting towards the second side Da2 in the axial direction Da due to the weight F1 of the casing 5, the force F2 acting from the piping 90, etc. When such deformation occurs, the lower end of the discharge scroll 52 is displaced so as to move closer to the gear housing 2 in the axial direction Da. Here, the first-stage casing 5A, which houses the first-stage impeller 40A, has a larger diameter than the second-stage casing 5B. When the diameter of the impeller 40 is increased, the weight F1 of the casing 5 increases accordingly. As a result, the amount of displacement downward Dv in the vertical direction Dv acting on the casing 5 due to the weight F1 also increases. In other words, the amount of deformation of the discharge scroll 52 in the first-stage casing 5A also increases. Furthermore, when the working fluid is at a high temperature, the pipe 90 expands due to thermal expansion in the axial direction Da, which increases the force F2 acting from the pipe 90 to the casing 5 in the axial direction Da.

[0058] In contrast, when the lower end of the discharge scroll 52 is displaced in the axial direction Da towards the gear housing 2, the first surface 71f and the second surface 82f of the restricting member 7A come into contact. Therefore, the displacement of the discharge scroll 52 in the axial direction Da towards the second side Da2, which forms a region Dv below the impeller 40 in the casing 5, is restricted by the restricting member 7A. In other words, the casing 5 can be restricted from approaching the gear housing 2 toward the second side Da2 in the axial direction Da. This prevents the casing 5 from deforming toward the gear housing 2 by collapsing in the axial direction Da in the region Dvd below the impeller 40 in the axial direction Dv. Thus, the deformation of the casing 5 can be suppressed by the restricting member 7A.

[0059] Furthermore, the discharge scroll 52 of the casing 5 is connected to the outermost part of the casing body 51 that houses the impeller 40 in the radial direction Dr. In addition, the discharge scroll 52 and the gear housing 2 are spaced apart in the axial direction Da, with a space S between them. but Therefore, compared to the casing body 51, the discharge scroll 52, which forms a region Dvd below the impeller 40 in the casing 5, is more susceptible to displacement in the axial direction Da. In response to this, the restricting member 7A is positioned in the space S between the discharge scroll 52 and the gear housing 2, which are spaced apart in the axial direction Da. This effectively prevents the discharge scroll 52 from deforming and collapsing in the axial direction Da due to the influence of its own weight, and the restricting member 7A can suppress this deformation. Furthermore, by suppressing the displacement of the discharge scroll 52, the connection portion between the casing body 51 and the discharge scroll 52 of It can also suppress deformation.

[0060] Furthermore, the first surface 71f of the first member 70A fixed to the gear housing 2 and the second surface 82f of the second member 80A fixed to the discharge scroll 52 are narrowest in the axial direction Da. Therefore, when a displacement occurs in the axial direction Da of the casing 5 that brings it closer to the gear housing 2, the first surface 71f and the second surface 82f come into contact first. As a result, the displacement of the casing 5 in the axial direction Da that brings it closer to the gear housing 2 can be controlled with high precision by the first surface 71f and the second surface 82f. Moreover, by adjusting the gap Z between the first surface 71f and the second surface 82f, the amount of displacement of the casing 5 in the axial direction Da that brings it closer to the gear housing 2 can be easily adjusted.

[0061] Furthermore, the restricting member 7A is positioned so as to overlap with the lower gear housing 21 when viewed from the axial direction Da. This means that when the restricting member 7A restricts the displacement of the casing 5 toward the gear housing 2 in the axial direction Da, the force acting on the gear housing 2 via the restricting member 7A due to the displacement of the casing 5 is supported by the lower gear housing 21. The weight of the casing 5 is F1. by The displacement increases as Dvd downwards in the vertical direction Dv. Therefore, the weight F1 of casing 5 byBy supporting the displacement with the lower gear housing 21, the displacement of the casing 5 toward the gear housing 2 in the axial direction Da can be effectively suppressed.

[0062] Furthermore, the lower gear housing 21 has higher rigidity than the upper gear housing 22. The lower gear housing 21, which constitutes the gear housing 2, supports the loads of the radial bearing 12, pinion gear 15, large-diameter gear 16, upper gear housing 22, etc. Therefore, compared to the upper gear housing 22, which only covers the radial bearing 12, pinion gear 15, and large-diameter gear 16, The lower gear housing 21 is It is formed with high rigidity. Therefore, the force acting on the gear housing 2 due to the displacement of the casing 5 can be stably received by the lower gear housing 21. As a result, the displacement of the casing 5 toward the gear housing 2 in the axial direction Da can be stably restricted by the restricting member 7A.

[0063] Furthermore, the restricting member 7A is positioned so as to overlap with the region that forms the outer peripheral end 52e of the radial Dr outer Dro of the discharge scroll 52 when viewed from the axial direction Da. Therefore, the casing 5 has a self-weight F1 to The region forming the outer peripheral end 52e, where the amount of displacement is greatest, can be supported by the restricting member 7A. Therefore, the displacement of the casing 5 can be most effectively restricted by the restricting member 7A.

[0064] Furthermore, the first member 70A has a circumferential restricting portion 72A. Therefore, the circumferential restricting portion 72A can restrict the relative displacement of the second member 80A with respect to the first member 70A in the circumferential direction Dc. Consequently, the displacement of the discharge scroll 52 in the circumferential direction Dc can be restricted by the circumferential restricting portion 72A. This makes it possible to suppress the displacement of the casing 5 in the circumferential direction Dc, in particular, due to the force F2 acting from the piping 90.

[0065] Furthermore, the second projection 82A of the second member 80A is positioned between a pair of circumferential restricting portions 72A of the first member 70A. Therefore, in the circumferential direction Dc, the second projection 82A is sandwiched between the pair of circumferential restricting portions 72A. 、 each side By abutting against this, the relative displacement of the second member 80A with respect to the first member 70A in the circumferential direction Dc on both sides can be restricted.

[0066] Furthermore, a second surface 82f is formed on the second projection 82A, which is sandwiched between a pair of circumferential restricting portions 72A in the circumferential direction Dc. As a result, the first surface 71f and the second surface 82f formed on the first base portion 71A are positioned between the pair of circumferential restricting portions 72A. Consequently, the positional relationship between the first surface 71f and the second surface 82f can be maintained while the displacement in the circumferential direction Dc is suppressed. Therefore, when an axial displacement Da occurs in the casing 5 that brings it closer to the gear housing 2, the first surface 71f and the second surface 82f can be brought into contact with high precision. This makes it possible to stably restrict the displacement of the casing 5 in the axial direction Da that brings it closer to the gear housing 2.

[0067] In this way, the first member 70A and the second member 80A, whose gap Z has been adjusted, are combined and temporarily fastened with bolts 201 and nuts 202, after which the first member 70A and the second member 80A are fixed to the gear housing 2 and casing 5. Therefore, the regulating member 7A can be easily and stably attached between the gear housing 2 and casing 5 at a predetermined position.

[0068] (First modified example of the embodiment) In the above embodiment, the geared compressor 1 was equipped with a regulating member 7A, but the shape of the regulating member is not limited to the above embodiment. For example, as shown in Figure 5, the geared compressor 1 in the first modified example of this embodiment is equipped with a regulating member 7B. The shape of the first member 70B and the second member 80B of the regulating member 7B differs from that of the regulating member 7A.

[0069] The first member 70B comprises a first base portion 71B and a pair of circumferential restricting portions 72B. The first base portion 71B has the same shape as the first base portion 71A of the first embodiment and is fixed to the side wall portion 231.

[0070] The pair of circumferential restricting portions 72B are arranged at a predetermined interval in the circumferential direction Dc. The pair of circumferential restricting portions 72B protrude from the first base portion 71B toward the second member 80B toward the first side Da1 in the axial direction Da.

[0071] The distance W11 (the dimension of the groove 72m in the circumferential direction Dc) between a pair of circumferential restricting portions 72B in the circumferential direction Dc decreases as it approaches the first base portion 71B in the axial direction Da. In each of the pair of circumferential restricting portions 72B, the surface facing the second projection 82B in the circumferential direction Dc is a concave curved surface 72w that, when viewed from the vertical direction Dv, is recessed so as to move away from the second projection 82B in the circumferential direction Dc.

[0072] The second member 80B comprises a second base portion 81B and a second projection portion 82B. The second base portion 81B has the same shape as the second base portion 81A of the first embodiment and is fixed to the discharge scroll 52.

[0073] The second projection 82B protrudes from the second base portion 81B toward the first member 70B on the second side Da2 in the axial direction Da. The second projection 82B is positioned between a pair of circumferential restricting portions 72B in the circumferential direction Dc. Here, the width dimension G11 of the second projection 82B in the circumferential direction Dc decreases as it moves away from the second base portion 81B in the axial direction Da. In the second projection 82B, the surface facing the concave curved surface 72w in the circumferential direction Dc is formed by a convex curved surface 82w that protrudes so as to approach the pair of circumferential restricting portions 72B in the circumferential direction Dc when viewed from the radial direction Dr.

[0074] In a geared compressor 1 equipped with a restricting member 7B of this configuration, the distance W11 between a pair of circumferential restricting portions 72B in the circumferential direction Dc decreases as it approaches the first base portion 71B in the axial direction Da. Correspondingly, the width dimension G11 of the second projection 82B in the circumferential direction Dc decreases as it moves away from the second base portion 81B in the axial direction Da. As a result, when the second projection 82B is displaced in the axial direction Da toward the first base portion 71B relative to the pair of circumferential restricting portions 72B, the concave curved surface 72w of the pair of circumferential restricting portions 72B and the convex curved surface 82w of the second projection 82B come into surface contact. Consequently, the displacement of the casing 5 toward the gear housing 2 in the axial direction Da is restricted. In other words, even with this configuration, the restricting member 7B can restrict the displacement of the casing 5 in the axial direction Da and the displacement in the circumferential direction Dc. Furthermore, even if a circumferential displacement Dc occurs relative to the casing 5 due to a force F2 acting from the piping 90, this circumferential displacement Dc can be suppressed.

[0075] Furthermore, the surface of the circumferential restricting portion 72B facing the second projection 82B in the circumferential direction Dc is not limited to being a concave curved surface 72w. The surface of the circumferential restricting portion 72B facing the second projection 82B in the circumferential direction Dc may be an inclined surface that forms a straight line when viewed from the vertical direction Dv. In that case, an inclined surface is also formed on the second projection 82B instead of a convex curved surface 82w.

[0076] (Second modified example of the embodiment) Furthermore, as shown in Figures 6 and 7, the geared compressor 1 in the second modified example of this embodiment is equipped with a regulating member 7C. The shapes of the first member 70C and the second member 80C of the regulating member 7C differ from those of the regulating members 7A and 7B.

[0077] The regulating member 7C comprises a first member 70C and a second member 80C. The first member 70C and the second member 80C are arranged facing each other in the axial direction Da.

[0078] The first member 70C is fixed to the lower gear housing body 23 by bolts (not shown) or the like. The first member 70C comprises a first base portion 71C and a first projection portion 72C.

[0079] The first base portion 71C is fixed to the outer surface of the side wall portion 231 facing the first side Da1 in the axial direction Da by bolts (not shown) or the like without any gaps. The first base portion 71C is formed in a plate shape that extends along a virtual plane perpendicular to the axial direction Da.

[0080] The first projection 72C protrudes from the first base portion 71C toward the second member 80C, on the first side Da1 in the axial direction Da. When viewed from the vertical direction Dv, the first projection 72C extends from near the center of the circumferential direction Dc of the first base portion 71C toward the axial direction Da. The first projection 72C extends such that the amount of protrusion from the first base portion 71C decreases as it moves downward Dvd in the vertical direction Dv.

[0081] The first member 70C has a first surface 72g. The first surface 72g is inclined so as to move away from the second member 80C in the axial direction Da, from the inner Dri in the radial direction Dr to the outer Dro. In this embodiment, the first surface 72g is formed at the tip of the first side Da1 in the axial direction Da of the first projection 72C. In other words, the first surface 72g is an inclined plane in the first projection 72C that faces the first side Da1 in the axial direction Da. The first surface 72g is inclined so as to move downward Dvd in the vertical direction Dv, approaching the first base portion 71C in the axial direction Da.

[0082] The second member 80C is fixed to the casing 5 by bolts (not shown) or the like. The second member 80C comprises a second base portion 81C and a second projection portion 82C.

[0083] The second base portion 81C is fixed to the discharge scroll 52 on the outer surface facing the second side Da2 in the axial direction Da, without any gaps, by bolts (not shown) or the like. The second base portion 81C is formed in a plate shape that extends along a virtual plane perpendicular to the axial direction Da.

[0084] The second projection 82C protrudes from the second base portion 81C toward the first member 70C towards the second side Da2 in the axial direction Da. When viewed from the vertical direction Dv, the second projection 82C extends from near the center of the circumferential direction Dc of the second base portion 81C toward the axial direction Da. The second projection 82C extends such that the amount of protrusion from the second base portion 81C increases as it moves downward Dvd in the vertical direction Dv.

[0085] Furthermore, the second member 80C has a second surface 82g. The second surface 82g extends radially from the inner Dri to the outer Dro, and in the axial Da direction, it is connected to the first member 70C. to It is inclined to approach and is formed parallel to the first surface 72g. The second surface 82g in this embodiment is the second projection 82C in the axial direction Da two Side Da 2 It is formed at the tip. Second side 82g This is an inclined plane in the second projection 82C that faces the second side Da2 in the axial direction Da. The second surface 82g is inclined so that it moves away from the second base portion 81C in the axial direction Da as it moves downward Dvd in the vertical direction Dv.

[0086] If the discharge scroll 52 deforms in such a way that it tilts in the axial direction Da due to the influence of its own weight F1, the discharge scroll 52 may not only move closer to the gear housing 2 in the axial direction Da, but also be displaced from the inner Dri to the outer Dro in the radial direction Dr. In contrast, in the regulating member 7C of the second modified example, the first surface 72g is inclined so as to move away from the second member 80C in the axial direction Da, from the inner Dri to the outer Dro in the radial direction Dr. In addition, the second surface 82g is inclined so as to move away from the first member 70C in the axial direction Da, from the inner Dri to the outer Dro in the radial direction Dr. toThe surfaces are inclined to move closer together. This allows the first surface 72g and the second surface 82g to make surface contact even if radial displacement Dr occurs in the discharge scroll 52. Therefore, deformation of the discharge scroll 52 can be suppressed more stably.

[0087] (Other embodiments) Although embodiments of this disclosure have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments and may include design changes and the like that do not depart from the gist of this disclosure.

[0088] In the above embodiment, the geared compressor 1 was described using a so-called single-shaft, two-stage configuration as an example. However, the configuration of the geared compressor 1 is not limited to this, and it may have two shafts, four stages, or more shafts and stages depending on the design and specifications.

[0089] Furthermore, the restricting members 7A to 7C are not limited to being fixed to both the gear housing 2 and the casing 5, as in this embodiment. The restricting members 7A to 7C may be fixed to only one of the gear housing 2 or the casing 5, and arranged so that a gap is formed in the axial direction Da relative to the other, as long as they can restrict the displacement of the casing 5 toward the gear housing 2 in the axial direction Da.

[0090] Furthermore, with respect to the restricting members 7A to 7C, the first members 70A to 70C are not limited to being fixed to the gear housing 2, but may also be fixed to the casing 5. In other words, the second members 80A to 80C are not limited to being fixed to the casing 5, but may also be fixed to the gear housing 2.

[0091] The regulating members 7A to 7C are not limited to being present as a single unit in the geared compressor 1. Multiple regulating members 7A to 7C may be present in the geared compressor 1. Therefore, the regulating members 7A to 7C are not limited to being present only in the large-diameter first-stage casing 5A, but may also be present in the second-stage casing 5B, etc., which has a smaller diameter than the first-stage casing 5A.

[0092] Furthermore, the shapes of the restricting members 7A to 7C are not limited to those described above. For example, restricting members 7A and 7B may have a structure in which only one circumferential restricting portion 72A and 72B is arranged. Also, the shapes of the restricting members 7A to 7C in the embodiment and modified examples may be combined in various ways.

[0093] Furthermore, in the above embodiment, the restricting member 7A restricts the axial displacement Da and the circumferential displacement Dc of the casing 5. However, the restricting member that restricts the axial displacement Da of the casing 5 and the restricting member that restricts the circumferential displacement Dc of the casing 5 may be provided as separate members.

[0094] <Note> The geared compressor 1 described in the embodiment can be understood, for example, as follows:

[0095] (1) A geared compressor 1 according to the first embodiment includes: a rotating shaft 30 extending in the axial direction Da along the axis O and centered on the axis O; a gear housing 2 housing gears 15 and 16 that rotate the rotating shaft 30 in the circumferential direction Dc around the axis O; an impeller 40 fixed to the end of the rotating shaft 30 protruding from the gear housing 2 in the axial direction Da and formed in the shape of a disc centered on the axis O; a casing 5 fixed to the gear housing 2, which houses the impeller 40 and forms a discharge space 52s inside to which the fluid compressed by the impeller 40 is supplied; and regulating members 7A to 7C fixed to at least one of the gear housing 2 and the casing 5 below the impeller 40 in the vertical direction Dv and which restrict the displacement of the casing 5 toward the gear housing 2 in the axial direction Da.

[0096] As a result, the displacement of the casing 5 toward the gear housing 2 in the axial direction Da in the region below Dv in the vertical direction Dv relative to the impeller 40 is restricted. Therefore, deformation toward the gear housing 2 such that the casing 5 collapses in the axial direction Da in the region below Dv in the vertical direction Dv relative to the impeller 40 is suppressed. Thus, the deformation of the casing 5 can be suppressed by the restricting member 7A.

[0097] (2) The geared compressor 1 according to the second embodiment is the geared compressor 1 of (1), wherein the casing 5 has a casing body 51 that houses the impeller 40 and a discharge scroll 52 that is connected to the casing body 51 on the outside in the radial direction Dr about the axis O and has the discharge space 52s formed inside, the discharge scroll 52 and the gear housing 2 are arranged apart in the axial direction Da so that a space S is formed, and the regulating members 7A to 7C are arranged in the space S between the discharge scroll 52 and the gear housing 2.

[0098] As a result, the regulating member 7A can effectively suppress deformation of the discharge scroll 52, which would otherwise tilt in the axial direction Da due to the influence of the discharge scroll 52's own weight. Furthermore, by suppressing the displacement of the discharge scroll 52, the connection portion between the casing body 51 and the discharge scroll 52 of It can also suppress deformation.

[0099] (3) The geared compressor 1 according to the third embodiment is the geared compressor 1 of (2), wherein the regulating member 7A comprises first members 70A, 70C fixed to one of the gear housing 2 and the discharge scroll 52, and second members 80A, 80C fixed to the other of the gear housing 2 and the discharge scroll 52, wherein the first members 70A, 70C have first surfaces 71f, 72g facing the second members 80A, 80C in the axial direction Da, and the second members 80A, 80C have second surfaces 82f, 82g facing the first surfaces 71f, 72g in the axial direction Da, and the gap Z between the first surfaces 71f, 72g and the second surfaces 82f, 82g is between the first members 70A, 70C and the second members 80A, 80C During In this case, the axial direction Da is the narrowest.

[0100] As a result, when the casing 5 is displaced in the axial direction Da toward the gear housing 2, the first surface 71f and the second surface 82f make contact first. This allows the first surface 71f and the second surface 82f to precisely restrict the displacement of the casing 5 toward the gear housing 2 in the axial direction Da. Furthermore, by adjusting the gap Z between the first surface 71f and the second surface 82f, the amount of displacement of the casing 5 toward the gear housing 2 in the axial direction Da can be easily adjusted.

[0101] (4) The geared compressor 1 according to the fourth embodiment is any one of the geared compressors 1 of (1) to (3), wherein the gear housing 2 comprises a lower gear housing 21 positioned below the vertical direction Dv with respect to the axis O, and an upper gear housing 22 positioned above the vertical direction Dv with respect to the lower gear housing 21 and covering the gears 15 and 16 together with the lower gear housing 21, and the regulating members 7A to 7C are positioned to overlap with the lower gear housing 21 when viewed from the axial direction Da.

[0102] As a result, when the regulating member 7A restricts the displacement of the casing 5 toward the gear housing 2 in the axial direction Da, the force acting on the gear housing 2 via the regulating member 7A due to the displacement of the casing 5 is supported by the lower gear housing 21. The weight of the casing 5 is F1. by The displacement increases as Dvd downwards in the vertical direction Dv. Therefore, the weight F1 of casing 5 by By supporting the displacement with the lower gear housing 21, the displacement of the casing 5 toward the gear housing 2 in the axial direction Da can be effectively suppressed.

[0103] (5) The geared compressor 1 according to the fifth embodiment is the geared compressor 1 of (4), wherein the lower gear housing 21 is connected to the upper gear housing 22 comparison It also possesses high rigidity.

[0104] This allows the lower gear housing 21 to stably receive the force acting on the gear housing 2 due to the displacement of the casing 5. As a result, the regulating member 7A can stably restrict the displacement of the casing 5 toward the gear housing 2 in the axial direction Da.

[0105] (6) The geared compressor 1 according to the sixth embodiment is any one of the geared compressors 1 of (1) to (5), wherein the regulating members 7A to 7C are positioned so as to overlap with the outer peripheral end 52e of the outer radial Dr of the discharge scroll 52 when viewed from the axial direction Da.

[0106] As a result, the weight F1 in casing 5 to The region forming the outer peripheral end 52e, where the amount of displacement is greatest, can be supported by the restricting member 7A. Therefore, the displacement of the casing 5 can be most effectively restricted by the restricting member 7A.

[0107] (7) The geared compressor 1 according to the seventh embodiment is the geared compressor 1 of (3), wherein the first member 70A has a circumferential restricting portion 72A that restricts the relative displacement of the second member 80A with respect to the first member 70A in at least one direction of the circumferential direction Dc.

[0108] This allows the relative displacement of the second member 80A with respect to the first member 70A in the circumferential direction Dc to be restricted. Therefore, the displacement of the casing 5 in the circumferential direction Dc can be restricted by the circumferential restricting portion 72A.

[0109] (8) The geared compressor 1 according to the eighth embodiment is the geared compressor 1 of (7), wherein the first member 70A comprises a first base portion 71A fixed to one of the gear housing 2 and the discharge scroll 52, and a pair of circumferential restricting portions 72A arranged at intervals in the circumferential direction Dc and projecting in the axial direction Da from the first base portion 71A toward the second member 80A, and the second member 80A comprises a second base portion 81A fixed to the other of the gear housing 2 and the discharge scroll 52, and a second projection portion 82A projecting from the second base portion 81A toward the first member 70A in the axial direction Da and arranged between the pair of circumferential restricting portions 72A, wherein the first surface 71f is formed on the first base portion 71A, and the second surface 82f is formed on the second projection portion 82A.

[0110] As a result, in the circumferential direction Dc, the second projection 82A is sandwiched between the pair of circumferential restricting portions 72A. 、 each sideBy abutting against each other, the relative displacement of the second member 80A to the first member 70A in the circumferential direction Dc on both sides can be restricted. Furthermore, a second surface 82f is formed on the second projection 82A, which is sandwiched between a pair of circumferential restricting portions 72A in the circumferential direction Dc. As a result, the first surface 71f and the second surface 82f formed on the first base portion 71A are positioned between the pair of circumferential restricting portions 72A. Consequently, the positional relationship between the first surface 71f and the second surface 82f can be maintained while the displacement in the circumferential direction Dc is suppressed. Therefore, when an axial displacement Da occurs in the casing 5 that brings it closer to the gear housing 2, the first surface 71f and the second surface 82f can be brought into contact with high precision. This makes it possible to stably restrict the displacement of the casing 5 in the axial direction Da that brings it closer to the gear housing 2.

[0111] (9) The geared compressor 1 according to the ninth embodiment is the geared compressor 1 of (8), wherein the distance W11 between the pair of circumferential restricting portions 72B in the circumferential direction Dc decreases as they approach the first base portion 71B in the axial direction Da, and the width dimension G11 of the second projection 82B in the circumferential direction Dc decreases as it moves away from the second base portion 81B in the axial direction Da.

[0112] As a result, when the second projection 82B is displaced in the axial direction Da toward the first base portion 71B relative to the pair of circumferential restricting portions 72B, the pair of circumferential restricting portions 72B and the second projection 82B come into surface contact. Consequently, the displacement of the casing 5 toward the gear housing 2 in the axial direction Da is restricted. In other words, even with this configuration, the restricting member 7B can restrict the displacement of the casing 5 in the axial direction Da and the displacement in the circumferential direction Dc.

[0113] (10) The geared compressor 1 according to the tenth embodiment is the geared compressor 1 of (3), wherein the first surface 72g is inclined toward the outer Dro from the inner Dri in the radial direction Dr toward the outer Dro toward the second member 80C in the axial direction Da, and the second surface 82g is inclined toward the outer Dro from the inner Dri in the radial direction Dr toward the first member 70C in the axial direction Da toward the first member 70C to It is inclined to approach and is formed parallel to the first surface 72g.

[0114] This allows the first surface 72g and the second surface 82g to be in surface contact even if radial displacement Dr occurs in the casing 5. Therefore, the deformation of the casing 5 can be suppressed more stably. [Explanation of Symbols]

[0115] 1... Geared compressor 2... Gear housing 3…Rotor 5…Casing 5A...First stage casing 5B...Second stage casing 7A~7C…Regulation member 11... Speed-increasing transmission unit 12…Radial bearing (bearing) 15…Pinion gear (gear) 16...Large diameter gear (gear) 21...Lower gear housing 21a...Opening 22… Upper gear housing 23...Lower gear housing body 231... Side wall section 232...peripheral wall part 24, 24a, 24b...Bearing support part 27, 27a, 27b... Lower casing support section 27h…Shaft insertion hole 28…Top cover 28a…recess 28b…Top opening 29… Upper gear housing body 30…Rotation axis 40... Impeller 40A...First stage impeller 40B...Second stage impeller 41…Disk 41a...First disk surface 41b...Second disk surface 42... Blade 45... Impeller flow path 45i…Inlet 45o…outlet 51…Casing body 511... Casing base 511h... Casing shaft insertion hole 512... Nozzle part 512a... Inlet 513...Flange section 52... Discharge scroll 52e...Outer edge 52s…Discharge space 525... Exhaust passage 70A~70C...First component 71A, 71B... First base section 72A, 72B…Circumferential direction regulation part 71f, 72g…front page 72h…First through hole 72m…ditch 72w…Concave curved surface (surface) 80A, 80B, 80C... Second component 81A, 81B... Second base section 82A, 82B...Second protrusion 82f, 82g…Second side 82h…Second through hole 82w…Convex curved surface (surface) 90... Piping 201... Bolt 202... Nut D1...Thickness D2…interval Da... Axis Da1…first side Da2…Second side Dc…Circumferential direction Dr…Radial direction Dri…inside Dro... outside Dv…Vertical direction F…Installation surface O…Axis line S…Space G11...Width dimension Z...Gap

Claims

1. A rotational axis extending in the axial direction from which the axis extends, A gear housing containing a gear that rotates the aforementioned rotating shaft in the circumferential direction around the aforementioned axis, An impeller is fixed to the end of the rotating shaft that protrudes axially from the gear housing and is formed in the shape of a disc with respect to the axis, A casing body fixed to the gear housing and housing the impeller inside, A discharge scroll is connected to the casing body radially outward with respect to the axis, and is positioned axially away from the gear housing, with a discharge space formed inside to which the fluid compressed by the impeller is supplied. The gear housing and the discharge scroll are provided with a restricting member fixed vertically downward with respect to the impeller, which restricts the displacement of the casing body toward the discharge scroll in the axial direction, The aforementioned restraining member is A first member fixed to either the gear housing or the discharge scroll, The gear housing and a second member fixed to the other side of the discharge scroll are provided, The first member has a first surface facing the second member in the axial direction, The second member has a second surface that faces the first surface in the axial direction, The gap between the first surface and the second surface is narrowest in the axial direction between the first member and the second member. The first member has a first through-hole through which a bolt can be inserted, The second member has a second through-hole through which the bolt can be inserted, The geared compressor is formed such that the first through-hole communicates with the second through-hole when the first surface and the second surface are in close proximity.

2. The gear housing is A lower gear housing positioned below the axis in the vertical direction, The system comprises an upper gear housing positioned vertically above the lower gear housing and covering the gear together with the lower gear housing, The geared compressor according to claim 1, wherein the restricting member is positioned to overlap with the lower gear housing when viewed from the axial direction.

3. The geared compressor according to claim 2, wherein the lower gear housing has higher rigidity compared to the upper gear housing.

4. The geared compressor according to claim 1, wherein the regulating member is positioned such that, when viewed from the axial direction, it overlaps with the radially outer peripheral end of the discharge scroll.

5. The geared compressor according to claim 1, wherein the first member has a circumferential restricting portion that restricts the relative displacement of the second member with respect to the first member in at least one direction in the circumferential direction.

6. The first member is, A first base portion fixed to either the gear housing or the discharge scroll, The system comprises a pair of circumferential restricting portions that are spaced apart in the circumferential direction and protrude in the axial direction from the first base portion toward the second member, The second member is, A second base portion fixed to the gear housing and the other discharge scroll, The second base portion comprises a second projection that protrudes from the second base portion toward the first member in the axial direction and is positioned between a pair of circumferential restricting portions, The first surface is formed on the first base portion, The geared compressor according to claim 5, wherein the second surface is formed on the second projection.

7. The distance between the pair of circumferential restricting portions in the circumferential direction decreases as they approach the first base portion in the axial direction. The geared compressor according to claim 6, wherein the width dimension of the second projection in the circumferential direction decreases as it moves away from the second base in the axial direction.

8. The first surface is inclined from the inside to the outside in the radial direction, and away from the second member in the axial direction. The geared compressor according to claim 1, wherein the second surface is inclined from the inside in the radial direction outward so as to approach the first member in the axial direction and is formed parallel to the first surface.

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