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 geared compressors. [Background technology]

[0002] Centrifugal compressors are known as devices for compressing a fluid to generate a compressed fluid. As one type of centrifugal compressor, a geared compressor is known that compresses a fluid in stages with multiple impellers via multiple gears. For example, Patent Document 1 discloses a geared compressor that includes a rotatable impeller fixed to a rotating shaft and a casing having an accommodation space for accommodating the impeller. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-168759 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, when the diameter of the impeller is increased to improve the performance of the geared compressor, the discharge destination space must be increased in accordance with the increase in the amount of fluid discharged from the impeller. Therefore, the discharge scroll, which is a part of the casing and forms the discharge destination space inside, also becomes larger. Accordingly, the weight of the discharge scroll increases. When the weight of the discharge scroll increases, the part of the casing that connects the casing body that houses the impeller to the discharge scroll may be deformed. In particular, the effect of the weight of the discharge scroll is large below the vertical direction of the rotation axis, and the discharge scroll may be deformed so as to fall in the axial direction. When the discharge scroll is deformed, the shape of the casing changes, and the clearance between the impeller and the casing also changes.

[0005] The present disclosure has been made to solve the above-mentioned problems, and has an object to provide a geared compressor that can suppress deformation of the casing. [Means for solving the problem]

[0006] In order to solve the above problems, the geared compressor of the present disclosure includes a rotating shaft extending in an axial direction around an axis line, a gear housing accommodating gears that rotate the rotating shaft in a circumferential direction around the axis line, an impeller fixed to an end of the rotating shaft protruding from the gear housing in the axial direction and formed in a disk shape centered on the axis line, a casing fixed to the gear housing, accommodating the impeller therein and forming a discharge space therein to which fluid compressed by the impeller is supplied, and a regulating member fixed to at least one of the gear housing and the casing vertically below the impeller and regulating displacement of the casing toward the gear housing in the axial direction. Effect of the Invention

[0007] According to the geared compressor of the present disclosure, deformation of the casing can be suppressed. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional view taken along an axis of a geared compressor, illustrating a schematic configuration of the geared compressor according to an embodiment of the present disclosure. [Diagram 2] 2 is a view of a regulating member provided in the geared compressor of FIG. 1, as viewed from the circumferential direction. [Diagram 3] 3 is a view of the braking member of FIG. 2 as seen from the radially inner side. [Figure 4] 3 is a diagram showing a state in which the restricting member in FIG. 2 is set between a gear housing and a casing. FIG. [Diagram 5] 11 is a diagram showing a restricting member provided in a geared compressor according to a first modified example of an embodiment of the present disclosure, as viewed from the radially inner side. FIG. [Figure 6]13 is a view showing a restricting member provided in a geared compressor according to a second modified example of an embodiment of the present disclosure, as viewed in a circumferential direction. FIG. [Figure 7] 7 is a view of the restricting member in FIG. 6 as viewed from the inside in the radial direction. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, embodiments for carrying out a geared compressor according to the present disclosure will be described with reference to the accompanying drawings. However, the present disclosure is not limited to these embodiments.

[0010] (Configuration of a geared compressor) As shown in FIG. 1, a geared compressor 1 as a rotary machine according to this embodiment mainly includes a rotor 3, a speed increasing transmission part 11, a gear housing 2, a casing 5, and a restricting member 7A.

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

[0012] The rotating shaft 30 extends in an axial direction Da along which the axis line O extends, with the axis line O as the center. As shown in Fig. 1, the rotating shaft 30 is supported by the gear housing 2 or the casing 5 so as to be rotatable about the axis line O by a pair of radial bearings (bearings) 12. The pair of radial bearings 12 are disposed at intervals in the axial direction Da. The pair of radial bearings 12 are disposed at positions spaced apart on both sides in the axial direction Da with respect to a pinion gear 15, which will be described later.

[0013] The rotating shaft 30 is connected to a driving source (not shown) such as an external motor via the speed-increasing transmission unit 11. The speed-increasing transmission unit 11 is accommodated in the gear housing 2. The speed-increasing transmission unit 11 includes a pinion gear (gear) 15 and a large diameter gear (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 driven to rotate by the driving source. The large diameter gear 16 is set to have an outer diameter dimension larger than that of the pinion gear 15. Therefore, the rotation speed of the rotating shaft 30 to which the pinion gear 15 is fixed is higher than the rotation speed of the large diameter gear 16. In other words, the speed-increasing transmission unit 11 increases the rotation speed of the large diameter gear 16 caused by the external driving source via the pinion gear 15 and transmits it to the rotating shaft 30.

[0014] The impellers 40 are disposed at both ends in the axial direction Da of the rotary shaft 30. In this embodiment, each impeller 40 is a so-called open impeller including a disk 41 and a blade 42. Note that the impeller 40 may be a closed impeller including a cover.

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

[0016] In the following description, in 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. In other words, the side where the end of the rotating shaft 30 is located relative to the impeller 40 is the first side Da1 in the axial direction Da. Also, the side where the gear housing 2 is located relative to the impeller 40 is the second side Da2 in the axial direction Da. In other words, the first side Da1 in the axial direction Da and the second side Da2 in the axial direction Da are opposite to each other in the first stage impeller 40A and the second stage impeller 40B.

[0017] The blades 42 extend from the first disk surface 41a toward an inlet 512a of the casing 5, which will be described later. The blades 42 are arranged in a circumferential direction Dc around the axis O at intervals.

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

[0019] (Gear housing configuration) The gear housing 2 is formed so as to cover a part 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 in the axial direction Da. The impellers 40 disposed at both ends of the rotating shaft 30 in the axial direction Da are disposed at positions protruding from the gear housing 2 on both sides in 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 installation surface F of the foundation.

[0020] The gear housing 2 can be divided into upper and lower parts in a vertical direction Dv with respect to a dividing plane that is a virtual horizontal plane passing through the axis O. The gear housing 2 has a lower gear housing 21 and an upper gear housing 22.

[0021] The lower gear housing 21 is fixed to the installation surface F in an immovable state. The lower gear housing 21 is disposed below Dvd in the vertical direction Dv with respect to the axis O. The lower gear housing 21 has high rigidity compared to the upper gear housing 22. For example, the lower gear housing 21 is formed of a material or structure that is less likely to deform than the upper gear housing 22. The lower gear housing 21 of this embodiment has a lower gear housing main 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 toward the upper Dvu in the vertical direction Dv and is recessed toward the lower Dvd. The large diameter gear 16, the lower part of the pinion gear 15, and the lower parts of the pair of radial bearings 12 are accommodated 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 the lower 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 peripheral wall portion 232. The pair of side wall portions 231 are arranged parallel to each other at a predetermined interval in the axial direction Da. The pair of side wall portions 231 are arranged apart from the large diameter gear 16 in the axial direction Da so as to sandwich the large diameter gear 16 from the axial direction Da.

[0023] The peripheral wall portion 232 is formed so as to cover the large diameter gear 16 and the lower portion of the pinion gear 15 from the outer side Dro in the radial direction Dr centered on the axis O. The peripheral wall portion 232 connects the pair of side wall portions 231 to each other in the axial direction Da. 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 respectively support the pair of radial bearings 12. The pair of bearing support portions 24a and 24b are arranged at an interval in the axial direction Da.

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

[0026] The upper gear housing 22, together with the lower gear housing 21, covers the large diameter gear 16, the lower part of the pinion gear 15, and the pair of radial bearings 12. The upper gear housing 22 is disposed above Dvu in the vertical direction Dv with respect to the axis O. The upper gear housing 22 is fixed onto the lower gear housing 21 by bolts (not shown) or the like. In other words, the upper gear housing 22 is detachable from the lower gear housing 21 in a state where it is disposed above Dvu in 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 main body 29.

[0027] The upper cover 28 has a recess 28a recessed upward. The upper part of the pinion gear 15 is accommodated inside the recess 28a. The upper cover 28 of this embodiment extends in the circumferential direction Dc centered on the axis O, and is formed, for example, in a semicircular arc shape when viewed from the axial direction Da.

[0028] An upper opening 28b is formed at the upper part of the upper cover 28. The upper gear housing body 29 is disposed so as to close the upper opening 28b of the upper cover 28. The upper gear housing body 29 is formed so as to cover the upper part of the pinion gear 15 from the outside Dro in the radial direction Dr centered on 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 casings 5 ​​are disposed on both outer sides in the axial direction Da with respect to the gear housing 2. The casings 5 ​​have 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 accommodates the impeller 40 therein and defines a discharge space therein to which the working fluid (fluid, for example, air) compressed by the impeller 40 is supplied. Each casing 5 in this embodiment has a casing body 51 and a discharge scroll 52.

[0031] The casing body 51 accommodates the impeller 40 therein. The casing body 51 has a casing base portion 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 part 27 of the gear housing 2 via bolts (not shown) or the like. A casing shaft insertion hole 511h through which the rotating shaft 30 is inserted is formed in the center of the casing base 511.

[0033] The nozzle portion 512 has an inlet port 512a formed therein, which is a space through which the working fluid to be supplied to the impeller 40 flows. It extends from the casing base 511 in the axial direction Da. The nozzle portion 512 is disposed on a first side Da1 in the axial direction Da with respect to the casing base 511. The nozzle portion 512 extends from the casing base 511 in the axial direction Da. The nozzle portion 512 is formed in a cylindrical shape centered on the axis O. The nozzle portion 512 is formed so that the diameter dimension (flow path cross section as viewed from the axial direction Da) centered on the axis O gradually decreases from the first side Da1 in the axial direction Da to the second side Da2. In the nozzle portion 512, a flange portion 513 is formed at the end of the first side Da1 in the axial direction Da, the diameter of which increases toward the outside Dro in the radial direction Dr. A pipe 90 for feeding the working fluid into the casing 5 is connected to the flange portion 513 via a bolt (not shown) or the like. As a result, the working fluid flows from the pipe 90 into the nozzle portion 512. As the impeller 40 rotates in the circumferential direction Dc about the axis O, the working fluid is sucked from the outside to the inside of the casing 5 through the suction port 512a.

[0034] The discharge scroll 52 is connected to the outer side Dro in the radial direction Dr with respect to the casing body 51. The discharge scroll 52 is formed so as to extend further toward the outer side Dro in the radial direction Dr than the lower casing support part 27. The discharge scroll 52 extends in the circumferential direction Dc. The discharge scroll 52 of the first stage casing 5A in which the first stage impeller 40A is housed is formed to have a larger diameter (larger in the radial direction Dr) than the discharge scroll 52 of the second stage casing 5B in which the second stage impeller 40B is housed. An exhaust passage 525 and a discharge space 52s are formed inside the discharge scroll 52 of this embodiment.

[0035] The exhaust passage 525 causes the working fluid compressed by the impeller 40 to flow out to the discharge space 52s. The exhaust passage 525 is formed on the outer side Dro in the radial direction Dr with respect to the outlet 45o of the impeller passage 45. The exhaust passage 525 is a passage extending in the radial direction Dr when viewed from the circumferential direction Dc.

[0036] The discharge space 52s allows the working fluid that has flowed through the exhaust passage 525 to flow out. That is, the fluid compressed by the impeller 40 is supplied to the discharge space 52s. The discharge space 52s communicates with the exhaust passage 525 on the outer side Dro in the radial direction Dr. The discharge space 52s is formed in a spiral shape that continues in the circumferential direction Dc. The discharge space 52s is formed so that its cross-sectional area gradually decreases toward a discharge port (not shown) that is connected to the outside of the casing 5. The working fluid is further compressed while swirling around the circumferential direction Dc along the discharge space 52s, and then discharged from the discharge port.

[0037] The discharge scroll 52 and the gear housing 2 are disposed at an interval 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 disposed at an interval in the axial direction Da while overlapping in positions in the vertical direction Dv. In other words, the discharge scroll 52 and the lower gear housing body 23 are disposed at an interval in the axial direction Da so that a space S is formed.

[0038] (Configuration of the Regulating Member) The regulating member 7A regulates displacement of the casing 5 toward the gear housing 2 in the axial direction Da. The regulating member 7A is disposed in the space S between the discharge scroll 52 and the gear housing 2. In this embodiment, the regulating member 7A is disposed in the space S between the gear housing 2 and the discharge scroll 52 of the first stage casing 5A in which the first stage impeller 40A is housed. Therefore, the regulating member 7A regulates 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 regulating 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 regulating member 7A is disposed at a position overlapping with the lower gear housing 21 when viewed from the axial direction Da. In particular, the regulating member 7A in this embodiment is disposed at a position overlapping with a wall portion forming the outer peripheral end portion 52e of the outer side Dro in the radial direction Dr of the discharge scroll 52 when viewed from the axial direction Da. Moreover, only one regulating member 7A is disposed in the geared compressor 1.

[0040] As shown in Figures 2 and 3, the regulating member 7A includes 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. The first member 70A in this embodiment is fixed to the lower gear housing main body 23. More specifically, the first member 70A is fixed to a side wall portion 231 close to the first stage impeller 40A. The first member 70A in this embodiment includes a first base portion 71A and a pair of circumferential direction restricting 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 by bolts (not shown) or the like without leaving any gaps. The first base portion 71A is formed in a plate shape extending along an imaginary plane perpendicular to the axial direction Da. The first base portion 71A is formed thicker near the center in the circumferential direction Dc so as to form a convex shape protruding toward the first side Da1 in the axial direction Da when viewed from the vertical direction Dv.

[0043] As shown in FIG. 3, the circumferential direction 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 direction restricting portions 72A restricts the relative displacement of the second member 80A with respect to the first member 70A in both directions in the circumferential direction Dc. The pair of circumferential direction restricting portions 72A are arranged at a predetermined interval in the circumferential direction Dc. The pair of circumferential direction restricting portions 72A protrude from the first base portion 71A toward the second member 80A to the first side Da1 in the axial direction Da. When viewed from the vertical direction Dv, each of the circumferential direction restricting portions 72A extends in a rectangular cross section from the vicinity of the center of the first base portion 71A in the circumferential direction Dc. Each of the pair of circumferential direction restricting portions 72A extends in the radial direction Dr. As a result, a groove 72m recessed in the axial direction Da is formed between the pair of circumferential direction restricting portions 72A in the circumferential direction Dc when viewed from the vertical direction Dv. The groove 72m is formed between the pair of circumferential direction restricting portions 72A so as to communicate with each other in the radial direction Dr.

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

[0045] The first member 70A has a first surface 71f facing the second member 80A in the axial direction Da. The first surface 71f in this embodiment 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. That is, the first surface 71f is a plane that faces the first side Da1 in the axial direction Da between the pair of circumferential direction restricting portions 72A.

[0046] The second member 80A is fixed to the discharge scroll 52. The second member 80A is disposed so as to overlap with the first member 70A in the radial direction Dr. Furthermore, the second member 80A of the present embodiment is disposed so as to partially overlap with the first member 70A in the axial direction Da. The second member 80A includes a second base portion 81A and a second protrusion portion 82A.

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

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

[0049] The second member 80A also has a second surface 82f facing 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 protrusion 82A. That is, the second surface 82f is a flat surface facing the second side Da2 in the axial direction Da of the second protrusion 82A. The second surface 82f faces the first surface 71f in the axial direction Da.

[0050] When the geared compressor 1 is not in operation, 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 in the first member 70A and the second member 80A.

[0051] Further, the thickness D1 of the second protrusion 82A in the circumferential direction Dc is smaller than the interval D2 in the circumferential direction Dc between the pair of circumferential regulating portions 72A. Further, the interval in the circumferential direction Dc between the pair of circumferential regulating portions 72A and the second protrusion 82A is 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 in operation, the second protrusion 82A is formed to be spaced a predetermined gap in the circumferential direction Dc from both of the pair of circumferential regulating portions 72A.

[0052] Further, the second protrusion 82A has a second through hole 82h. The second through hole 82h penetrates the second protrusion 82A in the circumferential direction Dc. As shown in Fig. 4, the first through hole 72h of the pair of circumferential direction restricting portions 72A is formed to communicate with the second through hole 82h of the second protrusion 82A in a state in which the first surface 71f and the second surface 82f are close to each other (a state in which the first surface 71f and the second surface 82f are in contact with each other).

[0053] (Procedure for installing the restriction parts) Next, a method of attaching the above-mentioned regulating member 7A to the gear housing 2 and the casing 5 will be described. First, before attaching the regulating member 7A to the gear housing 2 and the casing 5, as shown in Fig. 4, the first member 70A and the second member 80A are assembled in advance. Specifically, the first member 70A and the second member 80A are temporarily fixed by a bolt 201 and a nut 202. When temporarily fixing, a nut 202 is fastened to the tip of the bolt with the bolt 201 inserted through the second through hole 82h of the second protrusion 82A and the first through hole 72h of the pair of circumferential direction regulating portions 72A.

[0054] Next, the first member 70A and the second member 80A fixed (temporarily fastened) by the bolts 201 and the 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 by, for example, bolts (not shown).

[0055] After the first base portion 71A is fixed to the side wall portion 231, the bolts 201 and the nuts 202 are removed. Thereafter, 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 preset numerical range. After the adjustment of the gap Z is completed, the second base portion 81A is fixed to the casing 5 by, for example, a bolt (not shown).

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

[0057] (Action and effect) In the geared compressor 1 having the above configuration, the gear housing 2 and the casing 5 are provided with a regulating member 7A fixed below the impeller 40 in the vertical direction Dv. As shown in FIG. 1, in the geared compressor 1 having such a regulating member 7A, the discharge scroll 52 may be deformed so as to fall toward 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, and the like. When such deformation occurs, the lower end of the discharge scroll 52 is displaced so as to approach the gear housing 2 in the axial direction Da. Here, the first stage casing 5A accommodating the first stage impeller 40A has a larger diameter than the second stage casing 5B. When the impeller 40 is made larger in diameter, the weight F1 of the casing 5 increases accordingly. As a result, the amount of displacement to the downward Dvd in the vertical direction Dv acting on the casing 5 due to the weight F1 also increases. That is, 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 thermally expands in the axial direction Da, and the force F2 acting from the pipe 90 to the casing 5 in the axial direction Da also increases.

[0058] On the other hand, when the lower end of the discharge scroll 52 is displaced so as to approach the gear housing 2 in the axial direction Da, the first surface 71f and the second surface 82f of the regulating member 7A come into contact with each other. Therefore, in the casing 5, the displacement of the discharge scroll 52 forming the region Dvd below the impeller 40 in the vertical direction Dv toward the second side Da2 in the axial direction Da is regulated by the regulating member 7A. That is, the casing 5 can be regulated from approaching the gear housing 2 toward the second side Da2 in the axial direction Da. This suppresses the deformation of the casing 5 toward the gear housing 2 so as to fall in the axial direction Da in the region Dvd below the impeller 40 in the vertical direction Dv. Therefore, the regulating member 7A can suppress the deformation of the casing 5.

[0059] Further, the discharge scroll 52 of the casing 5 is connected to the outside Dro in the radial direction Dr with respect to the casing main body 51 that houses the impeller 40. Furthermore, the discharge scroll 52 and the gear housing 2 are disposed apart in the axial direction Da, and a space S is formed therebetween. Therefore, the discharge scroll 52, which forms an area Dvd below the impeller 40 in the vertical direction Dv in the casing 5, is more likely to be displaced in the axial direction Da than the casing main body 51. In contrast, the regulating member 7A is disposed in the space S between the discharge scroll 52 and the gear housing 2 disposed apart in the axial direction Da. As a result, the regulating member 7A can effectively suppress deformation of the discharge scroll 52 such that the discharge scroll 52 falls in the axial direction Da due to the effect of its own weight. Furthermore, suppressing the displacement of the discharge scroll 52 also suppresses deformation in the connection portion between the casing main body 51 and the discharge scroll 52.

[0060] In addition, 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 the displacement of the casing 5 toward the gear housing 2 in the axial direction Da occurs, the first surface 71f and the second surface 82f come into contact with each other first. As a result, the displacement of the casing 5 toward the gear housing 2 in the axial direction Da can be regulated with high accuracy by the first surface 71f and the second surface 82f. 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.

[0061] Moreover, the regulating member 7A is disposed at a position overlapping with the lower gear housing 21 when viewed from the axial direction Da. As a result, when the regulating member 7A regulates 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 displacement due to the weight F1 of the casing 5 becomes larger toward the downward direction Dvd in the vertical direction Dv. Therefore, by supporting the displacement due to the weight F1 of the casing 5 by 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] In addition, the lower gear housing 21 has a higher rigidity than the upper gear housing 22. The lower gear housing 21 constituting the gear housing 2 supports the loads of the radial bearing 12, the pinion gear 15, the large diameter gear 16, the upper gear housing 22, etc. Therefore, it is formed with higher rigidity than the upper gear housing 22 which only covers the radial bearing 12, the pinion gear 15, and the large diameter gear 16. Therefore, the force acting on the gear housing 2 in accordance with 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 in the axial direction Da toward the gear housing 2 can be stably regulated by the regulating member 7A.

[0063] Furthermore, the regulating member 7A is disposed at a position overlapping with a region forming the outer peripheral end 52e of the outer side Dro in the radial direction Dr of the discharge scroll 52 when viewed from the axial direction Da. Therefore, the regulating member 7A can support the region forming the outer peripheral end 52e in the casing 5 where the amount of displacement due to its own weight F1 is the largest. Therefore, the displacement of the casing 5 can be most effectively restricted by the regulating member 7A.

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

[0065] Further, the second protrusion 82A of the second member 80A is disposed between the pair of circumferential direction restricting portions 72A of the first member 70A. Therefore, in the circumferential direction Dc, the second protrusion 82A is sandwiched between the pair of circumferential direction restricting portions 72A. As a result, by hitting each of the second protrusions 82A, it is possible to restrict the relative displacement of the second member 80A to the first member 70A on both sides in the circumferential direction Dc.

[0066] Furthermore, the second surface 82f is formed on the second protrusion 82A sandwiched between the pair of circumferential direction restricting portions 72A in the circumferential direction Dc. Therefore, the first surface 71f and the second surface 82f formed on the first base portion 71A are disposed between the pair of circumferential direction restricting portions 72A. As a result, 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 the casing 5 is displaced in the axial direction Da so as to approach the gear housing 2, the first surface 71f and the second surface 82f can be brought into contact with each other with high accuracy. This makes it possible to stably restrict the displacement of the casing 5 in the axial direction Da toward the gear housing 2.

[0067] In this manner, the first member 70A and the second member 80A with the gap Z adjusted are combined and temporarily fastened with the bolt 201 and the nut 202, and then the first member 70A and the second member 80A are fixed to the gear housing 2 and the casing 5. Therefore, the restricting member 7A can be easily and stably attached between the gear housing 2 and the casing 5 at a predetermined position.

[0068] (First Modification of the Embodiment) In the above embodiment, the geared compressor 1 includes the regulating member 7A, but the shape of the regulating member is not limited to that in the above embodiment. For example, as shown in Fig. 5, the geared compressor 1 in a first modification of the present embodiment includes a regulating member 7B. The regulating member 7B has a first member 70B and a second member 80B whose shapes are different from those of the regulating member 7A.

[0069] The first member 70B includes a first base portion 71B and a pair of circumferential direction restricting portions 72B. The first base portion 71B has a shape similar to that of the first base portion 71A of the first embodiment, and is fixed to the side wall portion 231.

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

[0071] A distance W11 in the circumferential direction Dc between the pair of circumferential restriction portions 72B (a dimension of the groove 72m in the circumferential direction Dc) decreases toward the first base portion 71B in the axial direction Da. In each of the pair of circumferential restriction portions 72B, a surface facing the second protrusion portion 82B in the circumferential direction Dc is a concave curved surface 72w that is recessed away from the second protrusion portion 82B in the circumferential direction Dc when viewed from the vertical direction Dv.

[0072] The second member 80B includes a second base portion 81B and a second protrusion portion 82B. The second base portion 81B has a shape similar to that of the second base portion 81A of the first embodiment, and is fixed to the discharge scroll 52.

[0073] The second protrusion 82B protrudes from the second base portion 81B toward the first member 70B to the second side Da2 in the axial direction Da. The second protrusion 82B is disposed between the pair of circumferential direction restricting portions 72B in the circumferential direction Dc. Here, the width dimension G11 of the second protrusion 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 protrusion 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 direction restricting portions 72B in the circumferential direction Dc when viewed from the radial direction Dr.

[0074] According to the geared compressor 1 having the regulating member 7B having such a configuration, the interval W11 between the pair of circumferential regulating parts 72B in the circumferential direction Dc decreases as the circumferential regulating parts 72B approach the first base part 71B in the axial direction Da. Correspondingly, the width dimension G11 of the second protrusion 82B in the circumferential direction Dc decreases as the circumferential regulating parts 72B move away from the second base part 81B in the axial direction Da. As a result, when the second protrusion 82B is displaced in the axial direction Da toward the first base part 71B with respect to the pair of circumferential regulating parts 72B, the concave curved surface 72w of the pair of circumferential regulating parts 72B and the convex curved surface 82w of the second protrusion 82B come into surface contact with each other. As a result, the displacement of the casing 5 toward the gear housing 2 in the axial direction Da is regulated. That is, even with such a configuration, the regulating member 7B can regulate the displacement of the casing 5 in the axial direction Da and the displacement in the circumferential direction Dc. Furthermore, even if a displacement occurs in the circumferential direction Dc with respect to the casing 5 due to the force F2 acting from the pipe 90, the displacement in the circumferential direction Dc can be suppressed.

[0075] In addition, the surface of the circumferential direction restricting portion 72B facing the second protrusion portion 82B in the circumferential direction Dc is not limited to being the concave curved surface 72w. In the circumferential direction restricting portion 72B, the surface facing the second protrusion portion 82B in the circumferential direction Dc may be an inclined surface that is linear when viewed from the vertical direction Dv. In this case, the second protrusion portion 82B also has an inclined surface instead of the convex curved surface 82w.

[0076] (Second Modification of the Embodiment) 6 and 7, the geared compressor 1 in the second modified example of the present embodiment includes a regulating member 7C. The regulating member 7C has a first member 70C and a second member 80C whose shapes are different from those of the regulating members 7A and 7B.

[0077] The regulating member 7C includes a first member 70C and a second member 80C. The first member 70C and the second member 80C are disposed to face 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 includes a first base portion 71C and a first protruding portion 72C.

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

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

[0081] The first member 70C has a first surface 72g. The first surface 72g is inclined from the inner side Dri to the outer side Dro in the radial direction Dr so as to move away from the second member 80C in the axial direction Da. 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 protruding portion 72C. That is, the first surface 72g is an inclined plane facing the first side Da1 in the axial direction Da of the first protruding portion 72C. The first surface 72g is inclined so as to approach the first base portion 71C in the axial direction Da as it moves downward Dvd in the vertical direction Dv.

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

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

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

[0085] The second member 80C also has a second surface 82g. The second surface 82g is inclined from the inner side Dri to the outer side Dro in the radial direction Dr so as to approach the first member 70C in the axial direction Da, and is formed parallel to the first surface 72g. The second surface 82g in this embodiment is formed at the tip of the first side Da1 in the axial direction Da of the second protrusion 82C. That is, the second protrusion 82C is an inclined plane facing the second side Da2 in the axial direction Da of the second protrusion 82C. The second surface 82g is inclined so as to move away from the second base portion 81C in the axial direction Da as it moves downward Dvd in the vertical direction Dv.

[0086] When the discharge scroll 52 is deformed to fall in the axial direction Da due to the influence of its own weight F1, the discharge scroll 52 may not only approach the gear housing 2 in the axial direction Da, but also be displaced from the inner side Dri to the outer side Dro in the radial direction Dr. In contrast, in the regulating member 7C of the second modified example, the first surface 72g is inclined from the inner side Dri to the outer side Dro in the radial direction Dr so as to move away from the second member 80C in the axial direction Da. In addition, the second surface 82g is inclined from the inner side Dri to the outer side Dro in the radial direction Dr so as to move closer to the first member 70C in the axial direction Da. This allows the first surface 72g and the second surface 82g to be in surface contact with each other even if the discharge scroll 52 is displaced in the radial direction Dr. Therefore, the deformation of the discharge scroll 52 can be more stably suppressed.

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

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

[0089] Furthermore, the regulating members 7A to 7C are not limited to being fixed to both the gear housing 2 and the casing 5 as in this embodiment. As long as the regulating members 7A to 7C can regulate the displacement of the casing 5 in the axial direction Da toward the gear housing 2, they may be fixed to only one of the gear housing 2 and the casing 5 and disposed such that a gap is formed with respect to the other in the axial direction Da.

[0090] Furthermore, in the regulating members 7A-7C, the first members 70A-70C are not limited to being fixed to the gear housing 2, and the first members 70A-70C may be fixed to the casing 5. In other words, the second members 80A-80C are not limited to being fixed to the casing 5, and the second members 80A-80C may be fixed to the gear housing 2.

[0091] The regulating members 7A to 7C are not limited to being arranged one by one in the geared compressor 1. A plurality of the regulating members 7A to 7C may be arranged in the geared compressor 1. Therefore, the regulating members 7A to 7C are not limited to being arranged only in the first stage casing 5A having a large diameter, and may be similarly arranged in the second stage casing 5B having a smaller diameter than the first stage casing 5A, etc.

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

[0093] In addition, in the above embodiment, the regulating member 7A is configured to regulate the displacement of the casing 5 in the axial direction Da and the displacement in the circumferential direction Dc, but the regulating member that regulates the displacement of the casing 5 in the axial direction Da and the regulating member that regulates the displacement of the casing 5 in the circumferential direction Dc may be provided as separate members.

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

[0095] (1) A geared compressor 1 according to a first aspect includes a rotating shaft 30 extending in an axial direction Da along which an axis O extends, centered on the axis O, a gear housing 2 accommodating gears 15, 16 for driving the rotating shaft 30 to rotate in a circumferential direction Dc around the axis O, an impeller 40 fixed to an end of the rotating shaft 30 protruding from the gear housing 2 in the axial direction Da and formed in a disk shape centered on the axis O, a casing 5 fixed to the gear housing 2, accommodating the impeller 40 therein, and forming a discharge space 52s therein to which a 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 a vertical direction Dv and regulating displacement of the casing 5 toward the gear housing 2 in the axial direction Da.

[0096] This restricts the displacement of the casing 5 toward the gear housing 2 in the axial direction Da in the region Dvd below the impeller 40 in the vertical direction Dv. This restricts the deformation of the casing 5 toward the gear housing 2 so as to fall in the axial direction Da in the region Dvd below the impeller 40 in the vertical direction Dv. Therefore, the restricting member 7A can restrict deformation of the casing 5.

[0097] (2) A geared compressor 1 according to a second aspect is the geared compressor 1 of (1), wherein the casing 5 has a casing body 51 that accommodates the impeller 40, and a discharge scroll 52 that is connected to the outer side Dro of the casing body 51 in a radial direction Dr centered on the axis O and has the discharge space 52s formed therein, the discharge scroll 52 and the gear housing 2 are arranged apart in the axial direction Da so as to form a space S, 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 prevent the discharge scroll 52 from collapsing in the axial direction Da due to the weight of the discharge scroll 52. Furthermore, by preventing the displacement of the discharge scroll 52, deformation of the connection portion between the casing body 51 and the discharge scroll 52 can also be prevented.

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

[0100] As a result, when the casing 5 is displaced toward the gear housing 2 in the axial direction Da, the first surface 71f and the second surface 82f come into contact with each other first. As a result, the first surface 71f and the second surface 82f can regulate the displacement of the casing 5 toward the gear housing 2 in the axial direction Da with high accuracy. 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) A geared compressor 1 according to a fourth aspect is any one of the geared compressors 1 of (1) to (3), wherein the gear housing 2 comprises a lower gear housing 21 arranged below the vertical direction Dv relative to the axis O, and an upper gear housing 22 arranged above the vertical direction Dv relative to the lower gear housing 21 and covering the gears 15, 16 together with the lower gear housing 21, and the regulating members 7A to 7C are arranged in a position overlapping with the lower gear housing 21 when viewed from the axial direction Da.

[0102] As a result, when the regulating member 7A regulates the displacement of the casing 5 in the axial direction Da toward the gear housing 2, 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 displacement due to the weight F1 of the casing 5 becomes larger the further downward Dvd in the vertical direction Dv. Therefore, by supporting the displacement due to the weight F1 of the casing 5 by the lower gear housing 21, the displacement of the casing 5 in the axial direction Da toward the gear housing 2 can be effectively suppressed.

[0103] (5) The geared compressor 1 according to a fifth aspect is the geared compressor 1 according to (4), wherein the lower gear housing 21 has high rigidity relative to the upper gear housing 22.

[0104] This allows the force acting on the gear housing 2 in association with the displacement of the casing 5 to be stably received by the lower gear housing 21. This allows the regulating member 7A to stably regulate the displacement of the casing 5 in the axial direction Da toward the gear housing 2.

[0105] (6) The geared compressor 1 according to a sixth aspect is any one of the geared compressors 1 of (1) to (5), wherein the regulating members 7A to 7C are arranged at a position overlapping with an outer peripheral end portion 52e of the outer side Dro of the discharge scroll 52 in the radial direction Dr when viewed from the axial direction Da.

[0106] This allows the restricting member 7A to support the region that forms the outer circumferential end 52e, which has the largest amount of displacement due to the weight F1 of the casing 5. Therefore, the displacement of the casing 5 can be restricted most effectively by the restricting member 7A.

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

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

[0109] (8) A geared compressor 1 according to an eighth aspect is the geared compressor 1 of (7), wherein the first member 70A includes a first base portion 71A fixed to one of the gear housing 2 and the discharge scroll 52, and a pair of the circumferential regulating portions 72A arranged at an interval in the circumferential direction Dc and protruding from the first base portion 71A toward the second member 80A in the axial direction Da, and the second member 80A includes a second base portion 81A fixed to the other of the gear housing 2 and the discharge scroll 52, and a second protrusion portion 82A protruding from the second base portion 81A toward the first member 70A in the axial direction Da and disposed between the pair of circumferential regulating portions 72A, and the first surface 71f is formed on the first base portion 71A, and the second surface 82f is formed on the second protrusion portion 82A.

[0110] As a result, the second protrusion 82A is sandwiched between the pair of circumferential direction restricting portions 72A in the circumferential direction Dc. By hitting each of these, it is possible to restrict the relative displacement of the second member 80A to both sides in the circumferential direction Dc with respect to the first member 70A. Furthermore, the second surface 82f is formed on the second protrusion 82A sandwiched between the pair of circumferential direction restricting portions 72A in the circumferential direction Dc. Therefore, the first surface 71f and the second surface 82f formed on the first base portion 71A are disposed between the pair of circumferential direction restricting portions 72A. As a result, the positional relationship between the first surface 71f and the second surface 82f can be maintained in a state in which the displacement in the circumferential direction Dc is suppressed. Therefore, when the casing 5 is displaced in the axial direction Da so as to approach the gear housing 2, the first surface 71f and the second surface 82f can be brought into contact with each other with high accuracy. As a result, it is possible to stably restrict the displacement of the casing 5 in the axial direction Da toward the gear housing 2.

[0111] (9) A geared compressor 1 according to a ninth aspect is the geared compressor 1 of (8), wherein the spacing W11 in the circumferential direction Dc between a pair of circumferential regulating portions 72B decreases as the circumferential direction Dc approaches the first base portion 71B in the axial direction Da, and the width dimension G11 in the circumferential direction Dc of the second protrusion portion 82B decreases as the circumferential direction Dc moves away from the second base portion 81B in the axial direction Da.

[0112] As a result, when the second protrusion 82B is displaced in the axial direction Da toward the first base portion 71B relative to the pair of circumferential direction restricting portions 72B, the pair of circumferential direction restricting portions 72B and the second protrusion 82B come into surface contact with each other. As a result, the displacement of the casing 5 in the axial direction Da toward the gear housing 2 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) A geared compressor 1 according to a tenth aspect is the geared compressor 1 of (3), wherein the first surface 72g is inclined from the inner side Dri to the outer side Dro in the radial direction Dr so as to move away from the second member 80C in the axial direction Da, and the second surface 82g is inclined from the inner side Dri to the outer side Dro in the radial direction Dr so as to move closer to the first member 70C in the axial direction Da, 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 with each other even if the casing 5 is displaced in the radial direction Dr. Therefore, 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-up transmission section 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 232...peripheral wall part 24, 24a, 24b...Bearing support part 27, 27a, 27b...Lower casing support part 27h…Shaft insertion hole 28…Upper 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...Disc 41a…First disk surface 41b...Second disk surface 42…Blade 45…Impeller passage 45i…Inlet 45o…outlet 51…Casing body 511…Casing base 511h…Casing shaft insertion hole 512…Nozzle section 512a…Suction port 513…Flange section 52…Discharge scroll 52e...Outer edge 52s…Discharge space 525…Exhaust passage 70A~70C...First component 71A, 71B…First base part 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 member 81A, 81B...Second base part 82A, 82B...Second protrusion 82f, 82g…Second side 82h…Second through hole 82w…Convex curved surface (surface) 90…Pipes 201...Bolt 202...Nut D1…Thickness D2…interval Da…Axial direction 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 rotating shaft extending around the axis in the axial direction along which the axis extends; A gear housing accommodating a gear for rotationally driving the rotating shaft in the circumferential direction around the axis; An impeller fixed to an end portion of the rotating shaft protruding in the axial direction from the gear housing and formed in a disk shape centered on the axis; A casing body fixed to the gear housing and accommodating the impeller therein; A discharge scroll connected to the outside in the radial direction centered on the axis with respect to the casing body and arranged apart from the gear housing in the axial direction, and having a discharge space formed therein for supplying the fluid compressed by the impeller; A gear-driven compressor comprising at least one of the gear housing and the discharge scroll, and a regulating member fixed below the impeller in the vertical direction and regulating displacement of the casing body approaching the discharge scroll in the axial direction.

2. 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, The first member has a first surface facing the second member in the axial direction, The second member has a second surface facing the first surface in the axial direction, The gear-driven compressor according to claim 1, wherein a gap between the first surface and the second surface is the narrowest in the axial direction between the first member and the second member.

3. The gear housing Comprises a lower gear housing arranged below the axis in the vertical direction, and An upper gear housing arranged above the lower gear housing in the vertical direction and covering the gear together with the lower gear housing, The gear-driven compressor according to claim 1 or 2, wherein the regulating member is arranged at a position overlapping the lower gear housing when viewed from the axial direction.

4. The gear-driven compressor according to claim 3, wherein the lower gear housing has higher rigidity than the upper gear housing.

5. The gear-driven compressor according to claim 1 or 2, wherein the regulating member is arranged at a position overlapping an outer peripheral end portion on the outer side in the radial direction of the discharge scroll when viewed from the axial direction.

6. The gear compressor according to claim 2, wherein the first member has a circumferential direction restricting portion that restricts relative displacement of the second member in at least one of the circumferential directions with respect to the first member.

7. The first member includes a first base portion fixed to one of the gear housing and the discharge scroll, and a pair of the circumferential direction restricting portions that are arranged at intervals in the circumferential direction and project in the axial direction from the first base portion toward the second member. The second member includes a second base portion fixed to the other of the gear housing and the discharge scroll, and a second protrusion that projects in the axial direction from the second base portion toward the first member and is arranged between the pair of the circumferential direction restricting portions. The first surface is formed on the first base portion. The second surface is formed on the second protrusion. The gear compressor according to claim 6.

8. The interval in the circumferential direction between the pair of the circumferential direction restricting portions is reduced as approaching the first base portion in the axial direction. The width dimension in the circumferential direction of the second protrusion is reduced as leaving the second base portion in the axial direction. The gear compressor according to claim 7.

9. The first surface is inclined so as to be separated from the second member in the axial direction from the inner side to the outer side in the radial direction. The second surface is inclined so as to approach the first member in the axial direction from the inner side to the outer side in the radial direction and is formed parallel to the first surface. The gear compressor according to claim 2.

Images