Rotating machine system and maintenance method for rotating machine

Abstract

To enhance maintainability.SOLUTION: A rotating machine system 1A comprises: a drive machine 2 having a drive shaft 21 which is rotationally driven around a center axis O; a transmission part 4A having a main shaft 41 connected to the drive shaft, a main gear 42 fixed to the main shaft, a sub-gear 46 engaged with the main gear, a sub-shaft 45 fixed to the sub-shaft, and a first gear 48A rotating integrally with the sub-shaft; a transmission 5 having a second gear 56A engaged with the first gear, an input shaft fixed with the second gear, and an output shaft 58 for gear-changing a rotation number of the input shaft, and outputting it; and a rotating machine 3 having a rotating machine shaft 35 connected to the output shaft, and rotationally driven at the rotating machine shaft by the transmission of the rotation of the output shaft thereto. The first gear is a flat gear having a plurality of first tooth parts 48g whose tooth stripes are parallel with center axes, and a second gear 56g is a flat gear having a plurality of second tooth parts whose tooth stripes are parallel with center axes, and which are arranged between the adjacent first tooth parts.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a rotating machine system and a method for maintaining a rotating machine. [Background technology]

[0002] Gears are often used to transmit driving force between a driving machine such as a motor and a rotary machine driven by the driving machine. For example, Patent Document 1 discloses a configuration in which the rotary drive shaft of a motor and the rotary shaft of an axial fan are connected via a gear housed in a gearbox. In this configuration, the rotary shaft of the axial fan has a rotary shaft housed in the gearbox. The rotary drive shaft of the motor is inserted into a through-hole formed in the gearbox. A gear on the axial fan side provided on the rotary shaft of the axial fan and a gear on the motor side provided on the rotary drive shaft of the motor are meshed within the gearbox. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-38679 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the configuration described in Patent Document 1, for example, to disconnect the motor and the axial fan for maintenance, the gearbox must be disassembled and the motor's rotary drive shaft and the like must be removed from the gearbox. Thus, disconnecting the drive unit from the rotating machine is time-consuming. In particular, if a transmission is disposed between the drive unit and the rotating machine, a similar problem occurs between the drive unit and the transmission. For this reason, improved maintainability is desired for systems that have a connection between the rotating shafts of rotating machines.

[0005] The present disclosure has been made to solve the above-mentioned problems, and has an object to provide a rotating machine system and a maintenance method for a rotating machine that can improve maintainability. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, a rotary machine system according to the present disclosure includes: a drive machine having a drive shaft that is driven to rotate around a central axis; a transmission unit that includes a main shaft connected to the drive shaft, a main gear fixed to the main shaft, a sub-gear that meshes with the main gear, a sub-shaft fixed to the sub-gear, and a first gear that rotates integrally with the sub-shaft; a transmission that includes a second gear that meshes with the first gear and an output shaft that changes the rotation speed of the second gear and outputs the rotation; and a rotary machine that has a rotary machine shaft connected to the output shaft and is driven to rotate by the transmission of rotation of the output shaft, wherein the first gear is a spur gear having a plurality of first tooth portions, each of which has a tooth trace parallel to the central axis; and the second gear is a spur gear having a plurality of second tooth portions, each of which has a tooth trace parallel to the central axis and is arranged between adjacent first tooth portions. The transmission unit has a casing that covers the main shaft, the main gear, the sub gear, and the sub shaft, and the first gear is disposed outside the casing. Another rotating machine system according to the present disclosure includes: a driving machine having a drive shaft that is driven to rotate about a central axis; a transmission unit including a main shaft connected to the drive shaft, a main gear fixed to the main shaft, a sub gear that meshes with the main gear, a sub shaft fixed to the sub gear, and a first gear that rotates integrally with the sub shaft; a transmission including a second gear that meshes with the first gear and an output shaft that changes the rotation speed of the second gear and outputs the second gear; and a rotating machine having a rotating machine shaft connected to the output shaft, wherein the rotating machine shaft is rotationally driven by the rotation of the output shaft transmitted thereto, and the first gear has a gear ratio of 1 / 2 to 1 / 2. the second gear is a spur gear having a plurality of first tooth portions, the tooth traces of which are spur teeth parallel to the central axis, the second gear having a plurality of second tooth portions, the tooth traces of which are spur teeth parallel to the central axis, and arranged between adjacent first tooth portions; and further comprising a coupling that detachably connects the output shaft and the rotating machine shaft; and a coupling cover that covers the coupling, the coupling cover comprising a lower cover that covers the coupling from below in the vertical direction, and an upper cover that covers the coupling from above in the vertical direction and is arranged detachably relative to the lower cover. Another rotating machine system according to the present disclosure includes: a driving machine having a drive shaft that is driven to rotate about a central axis; a transmission unit that includes a main shaft connected to the drive shaft, a main gear fixed to the main shaft, a counter gear that meshes with the main gear, a counter shaft fixed to the counter gear, and a first gear that rotates integrally with the counter shaft; a transmission that includes a second gear that meshes with the first gear and an output shaft that changes the rotation speed of the second gear and outputs it; and a rotating machine that has a rotating machine shaft connected to the output shaft and is driven to rotate by the transmission of rotation of the output shaft, wherein the first gear is a spur gear that has a plurality of first tooth portions, each of which has a tooth trace parallel to the central axis; the second gear has a plurality of second tooth portions, each of which has a tooth trace parallel to the central axis and is arranged between adjacent first tooth portions; and the second gear is an internal gear that has the second tooth portions on its inner circumferential surface. Another rotating machine system according to the present disclosure includes: a driving machine having a drive shaft that is driven to rotate about a central axis; a transmission unit that includes a main shaft connected to the drive shaft, a main gear fixed to the main shaft, a counter gear that meshes with the main gear, a counter shaft fixed to the counter gear, and a first gear that rotates integrally with the counter shaft; a transmission that includes a second gear that meshes with the first gear and an output shaft that changes the rotation speed of the second gear and outputs it; and a rotating machine that has a rotating machine shaft connected to the output shaft and is driven to rotate by the transmission of rotation of the output shaft, wherein the first gear is a spur gear that has a plurality of first tooth portions, which are spur teeth whose tooth traces are parallel to the central axis; the second gear has a plurality of second tooth portions, which are spur teeth whose tooth traces are parallel to the central axis and are arranged between adjacent first tooth portions; and the second gear is an external gear that has the second tooth portions on its inner circumferential surface and further has a plurality of teeth on its outer circumferential surface. Another rotating machine system according to the present disclosure includes: a driving machine having a drive shaft that is driven to rotate about a central axis; a transmission unit that includes a main shaft connected to the drive shaft, a main gear fixed to the main shaft, a counter gear that meshes with the main gear, a counter shaft fixed to the counter gear, and a first gear that rotates integrally with the counter shaft; a transmission that includes a second gear that meshes with the first gear and an output shaft that changes the rotation speed of the second gear and outputs it; and a rotating machine that has a rotating machine shaft connected to the output shaft and is driven to rotate by the transmission of rotation of the output shaft, wherein the first gear is a spur gear that has a plurality of first tooth portions, each of which has a tooth trace parallel to the central axis; and the second gear has a plurality of second tooth portions, each of which has a tooth trace parallel to the central axis and is arranged between adjacent first tooth portions,

[0007] A maintenance method for a rotating machine system according to the present disclosure includes a transmission unit including a drive machine having a drive shaft that is driven to rotate around a central axis, a main shaft connected to the drive shaft, a main gear fixed to the main shaft, a sub gear that meshes with the main gear, a sub shaft fixed to the sub gear, and a first gear that rotates integrally with the sub shaft, a transmission including a second gear that meshes with the first gear and an output shaft that changes the rotation speed of the second gear and outputs the second gear, and a rotating machine having a rotating machine shaft connected to the output shaft, wherein the rotating machine shaft is rotationally driven by the rotation of the output shaft transmitted thereto, and the first gear is a first gear having spur teeth whose tooth trace is parallel to the central axis. a second gear having a plurality of tooth portions, the second gear being spur teeth whose tooth traces are parallel to the central axis and having a plurality of second tooth portions arranged between adjacent first tooth portions, the maintenance method including: moving at least one of the transmission unit and the transmission relatively apart in the axial direction along which the central axis extends, thereby disengaging the meshing between the first gear and the second gear; performing maintenance on at least one of the transmission unit and the transmission; and moving at least one of the transmission unit and the transmission relatively closer to each other in the axial direction, thereby meshing the first gear with the second gear. [Effects of the Invention]

[0008] According to the rotating machine system and the maintenance method for the rotating machine system of the present disclosure, maintainability can be improved. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic diagram showing a schematic configuration of a rotating machine system according to a first embodiment of the present disclosure; [Figure 2] FIG. 2 is a cross-sectional view taken along the line AA in FIG. [Figure 3] FIG. 3 is a cross-sectional view taken along the arrow BB in FIG. 2. [Figure 4] 3 is a flowchart illustrating a procedure of a maintenance method for a rotating machine system according to an embodiment of the present disclosure. [Figure 5]1 is a view showing a state in which an upper half casing of a transmission casing of a rotary machine system and an upper cover of a coupling cover are removed. FIG. [Figure 6] FIG. 10 is a diagram illustrating a state in which the first gear and the second gear of the rotating machine system are separated. [Figure 7] FIG. 4 is a schematic diagram showing a schematic configuration of a rotating machine system according to a second embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments for carrying out a rotary machine system and a maintenance method for a rotary machine system according to the present disclosure will be described with reference to the accompanying drawings. However, the present disclosure is not limited to these embodiments.

[0011] (Compressor system configuration) As shown in FIG. 1, a rotating machine system 1A operates multiple compressors 3 at high speed with one driver 2. In the rotating machine system 1A, the multiple compressors 3 are lined up on the same side of the driver 2, and the multiple compressors 3 are connected in parallel to one driver 2. As shown in FIG. 1, the rotating machine system 1A of this embodiment includes a driver 2, multiple compressors 3 as rotating machines, a transmission unit 4A, and a transmission 5. In the rotating machine system 1A, the driver 2, the transmission unit 4A, the transmission 5, and the multiple compressors 3 are arranged in this order from a first side Da1 to a second side Da2 in an axial direction Da in which a central axis O extends. In the rotating machine system 1A of this embodiment, only one driver 2 is arranged.

[0012] The driver 2 is rotationally driven to generate power for driving the compressor 3. The driver 2 has a drive shaft 21 that rotates around a central axis O. Only one drive shaft 21 is provided. The drive shaft 21 is formed in a cylindrical shape centered on the central axis O. The driver 2 in this embodiment is a motor that drives the drive shaft 21. Note that the driver 2 may be any device other than a motor as long as it can generate power for driving the compressor 3, and a steam turbine or the like may also be used.

[0013] The compressor 3 has a rotating machine shaft 35 that rotates about a first center line O1 extending parallel to the central axis O. The rotating machine shaft 35 is formed in a cylindrical shape centered on the first center line O1. The compressor 3 compresses gas as a working fluid. The compressor 3 compresses the gas using an impeller (not shown) provided on the rotating machine shaft 35. The compressor 3 of this embodiment is a single-shaft multi-stage centrifugal compressor that compresses, for example, hydrogen gas. The compressor 3 of this embodiment includes three compressors: a first compressor 31, a second compressor 32, and a third compressor (not shown). The first compressor 31, the second compressor 32, and the third compressor are connected in sequence via piping (not shown). In the rotating machine system 1A, the gas to be compressed is introduced into the first compressor 31, the second compressor 32, and the third compressor, in that order, and compressed sequentially. After being compressed in the third compressor, the gas is supplied to a supply destination outside the rotating machine system 1A. The multiple compressors 3 are not limited to being arranged so as to be connected in series to each other, but may be arranged in parallel so as to be separated from each other and be able to operate independently.

[0014] (Transmission section configuration) The transmission unit 4A increases the rotation speed of the drive shaft 21 and transmits the rotation to multiple transmissions 5. The transmission unit 4A connects one drive shaft 21 to multiple transmissions 5. The transmission unit 4A of this embodiment has a casing 40, a main shaft 41, a main gear 42, a main shaft bearing 43, a counter shaft 45, a counter gear 46, a first bearing 47, and a first gear 48A.

[0015] The casing 40 constitutes an exterior of the transmission unit 4 A. The casing 40 accommodates a main shaft 41, a main gear 42, a main shaft bearing 43, a counter shaft 45, a counter gear 46, and a first bearing 47 therein.

[0016] The main shaft 41 rotates together with the drive shaft 21. The main shaft 41 transmits the rotation of the drive shaft 21 to the sub gear 46 via the main gear 42. The main shaft 41 is connected to an end of the drive shaft 21 outside the casing 40. The main shaft 41 is driven to rotate around the central axis O by the drive shaft 21. The main shaft 41 is formed in a cylindrical shape centered on the central axis O. In other words, the main shaft 41 is arranged coaxially with the drive shaft 21. The main shaft 41 passes through the casing 40 so that its tip is arranged inside the casing 40.

[0017] The main gear 42 is fixed to the main shaft 41 inside the casing 40. The main gear 42 is an external gear formed in a disk shape centered on the central axis O. The main gear 42 of this embodiment has the largest outer diameter of all the gears used in the transmission part 4A and the transmission 5. However, the main gear 42 is not limited to having the largest outer diameter of all the gears used in the transmission part 4A.

[0018] The main shaft bearing 43 rotatably supports the main shaft 41 relative to the casing 40. The main shaft bearing 43 is fixed inside the casing 40. The main shaft bearing 43 in this embodiment is a journal bearing. A pair of main shaft bearings 43 are arranged on the main shaft 41 so as to sandwich the main gear 42 therebetween.

[0019] A plurality of countershafts 45 are arranged radially outside the main shaft 41 and spaced apart in the circumferential direction. The transmission 5 transmits the rotation of each of the countershafts 45 to correspond to each of the plurality of countershafts 45. The rotation of the main shaft 41 is transmitted to each countershaft 45, and the countershafts 45 rotate together with the main shaft 41. The countershafts 45 are formed in a cylindrical shape centered on a first center line O1 extending parallel to the central axis O. The countershafts 45 are arranged at a position spaced apart radially outside the main shaft 41 relative to the main shaft 41. The countershafts 45 extend parallel to the main shaft 41. The countershafts 45 rotate about the first center line O1 as the main shaft 41 rotates. An end of the countershaft 45 on the second side Da2 in the axial direction Da is arranged outside the casing 40. In other words, the countershafts 45 extend so as to protrude from the casing 40.

[0020] The sub gear 46 meshes with the main gear 42. The sub gear 46 is fixed to the sub shaft 45. The sub gear 46 is an external gear formed in a disk shape centered on the first center line O1. The sub gear 46 of this embodiment has an outer diameter smaller than that of the main gear 42. However, the sub gear 46 is not limited to having an outer diameter smaller than that of the main gear 42. For example, the sub gear 46 may have the same diameter as the main gear 42.

[0021] As shown in FIGS. 1 and 2 , the first bearing 47 supports the countershaft 45 rotatably relative to the casing 40. The first bearing 47 is fixed inside the casing 40. In this embodiment, the first bearing 47 is a journal bearing. As long as the first bearing 47 is a journal bearing, it may be of the same type and size as the main shaft bearing 43, or it may be of a different type and size. Therefore, the first bearing 47 may be a rolling bearing or a plain bearing. If the first bearing 47 is a plain bearing, it may be, for example, a cylindrical sleeve-type bearing that is not divided circumferentially. Furthermore, if the first bearing 47 is a plain bearing, it may be, for example, a tilting pad bearing having multiple pads divided circumferentially. A pair of first bearings 47 is arranged on the countershaft 45 so as to sandwich the counter gear 46.

[0022] The first gear 48A is fixed to the counter shaft 45. The first gear 48A rotates integrally with the counter shaft 45 about the first center line O1. The first gear 48A is fixed to an end of the counter shaft 45 on the second side Da2 in the axial direction Da. The first gear 48A is disposed outside the casing 40 so as to protrude from the casing 40 to the second side Da2 in the axial direction Da. The first gear 48A is an external gear formed in a disk shape centered on the first center line O1. The first gear 48A of the present embodiment has a larger outer diameter than the counter gear 46. The first gear 48A is a spur gear having a plurality of first tooth portions 48g, which are spur teeth whose tooth traces are parallel to the central axis O (first center line O1). The plurality of first tooth portions 48g are disposed at equal intervals in the circumferential direction Dc of the first gear 48A centered on the first center line O1. The tooth surface of the first tooth portion 48g facing the circumferential direction Dc is parallel to the central axis O (first center line O1).

[0023] The countershaft 45 is disposed in a state in which it is inserted through a first insertion hole (insertion hole) 40h formed in the casing 40. The first insertion hole 40h is formed so as to penetrate a wall surface of the casing 40 on the second side Da2 in the axial direction Da. The first insertion hole 40h is formed with a size that allows the first gear 48A to be inserted therethrough.

[0024] (Configuration of planetary gear machine) The transmission 5 increases the rotation speed of the first gear 48A and transmits it to the compressor 3. The transmission 5 connects one first gear 48A to one transmission 5. Together with the transmission unit 4A, the transmission 5 increases the rotation speed of a sun shaft 58 (described later) to a peripheral speed of approximately 10,000 rpm or more and 100,000 rpm or less during rated operation of the compressor 3. The transmission 5 of this embodiment includes a plurality of planetary gear mechanisms 50 and a transmission casing 60.

[0025] The multiple planetary gear mechanisms 50 are gear mechanisms arranged to surround the main shaft 41. Each planetary gear mechanism 50 is connected to a corresponding one of the compressors 3 in a one-to-one relationship. Each planetary gear mechanism 50 transmits the rotation of the main shaft 41 to the rotating mechanical shaft 35 of the corresponding one of the compressors 3. In this embodiment, three planetary gear mechanisms are arranged at equal intervals within the transmission casing 60: a first planetary gear mechanism 50A connected to the first compressor 31, a second planetary gear mechanism 50B connected to the second compressor 32, and a third planetary gear mechanism (not shown) connected to the third compressor. In this embodiment, the first planetary gear mechanism 50A, the second planetary gear mechanism 50B, and the third planetary gear mechanism (not shown) have the same configuration. As shown in FIG. 2, each planetary gear mechanism 50 in this embodiment has a plurality of planetary gears 53, a plurality of planetary gear shafts 54, a gear support portion 55, a second gear 56A, a sun gear 57, a sun shaft (output shaft) 58, and a second bearing 59.

[0026] The planetary gears 53 receive the rotation of the first gear 48A via the second gear 56A and rotate together with the rotation of the countershaft 45. The planetary gears 53 are disposed on the outer side Dro of the countershaft 45 in the radial direction Dr of the countershaft 45. As shown in FIG. 3 , the planetary gears 53 are disposed at intervals from one another in the circumferential direction Dc of the sun shaft 58. In this embodiment, three planetary gears 53 are disposed evenly spaced apart in the circumferential direction Dc. The number of planetary gears 53 is not limited to three and may be two or more, and four or more may be disposed. In this case, it is preferable that the number of planetary gears 53 is three or more and be disposed evenly spaced apart. Each planetary gear 53 is an external gear formed in a circular plate shape centered on the second center line O2. The planetary gears 53 do not revolve but only rotate about their own center line, the second center line O2.

[0027] As shown in Fig. 2, the planetary gear shaft 54 ​​is a planetary gear shaft that rotates together with the planet gears 53. The planetary gear shaft 54 ​​is formed in a cylindrical shape centered on a second center line O2 that extends parallel to the central axis O and the first center line O1. The planetary gear shaft 54 ​​is disposed at a position spaced apart from the counter shaft 45, on the outer side Dro in the radial direction Dr of the counter shaft 45. The planetary gear shaft 54 ​​extends parallel to the main shaft 41 and the counter shaft 45. The planetary gear shaft 54 ​​supports the planetary gear 53 so that it can rotate about the second center line O2.

[0028] The gear support portion 55 rotatably supports the plurality of planetary gears 53. The gear support portion 55 of this embodiment has a first gear support portion 55A and a second gear support portion 55B. Specifically, the first gear support portion 55A and the second gear support portion 55B are planet carriers that support both ends of the plurality of planetary gear shafts 54 rotatably about the second center line O2. The first gear support portion 55A and the second gear support portion 55B maintain the relative positions of the plurality of planetary gear shafts 54 so that the plurality of planetary gear shafts 54 do not move. The first gear support portion 55A is fixed to the transmission casing 60 in an immovable state. The second gear support portion 55B is not fixed to the transmission casing 60.

[0029] As shown in FIGS. 1 and 2, the second gear 56A meshes with the first gear 48A. The second gear 56A is disposed within the transmission casing 60. The second gear 56A of this embodiment is formed in a cylindrical shape extending in the axial direction Da about the first center line O1. The second gear 56A is formed with a size that allows the first gear 48A to be inserted therein. A second tooth portion 56g is formed at an end of the second gear 56A on a first side Da1 in the axial direction Da. The second tooth portion 56g is formed on an inner circumferential surface of the second gear 56A facing the inner side Dri in the radial direction Dr. In other words, the second gear 56A is an internal gear having the second tooth portion 56g on its inner circumferential surface. A plurality of second tooth portions 56g are formed at intervals in the circumferential direction Dc of the second gear 56A. Each second tooth portion 56g is a spur tooth whose tooth trace is parallel to the central axis O. The tooth surface of the second teeth portion 56g facing the circumferential direction Dc is parallel to the central axis O (first center line O1). The second teeth portion 56g meshes with the first teeth portion 48g. The number of teeth of the first teeth portion 48g is the same as the number of teeth of the second teeth portion 56g. The second teeth portion 56g is disposed between adjacent first teeth portions 48g in the circumferential direction Dc. When the second gear 56A meshes with the first gear 48A, the second teeth portion 56g comes into contact with the first teeth portion 48g. As a result, the second gear 56A rotates integrally with the countershaft 45.

[0030] Planetary meshing teeth 56s that mesh with the plurality of planetary gears 53 are formed on an end of the second gear 56A on a second side Da2 in the axial direction Da. The planetary meshing teeth 56s are formed on the inner circumferential surface of the second gear 56A. The planetary meshing teeth 56s mesh with the plurality of planetary gears 53. As shown in FIG. 3 , the second gear 56A meshes with the plurality of planetary gears 53 housed therein from the outer side Dro in the radial direction Dr. The second gear 56A rotates together with the first gear 48A and the counter shaft 45, thereby transmitting the rotation of the counter shaft 45 to the plurality of planetary gears 53 disposed therein. The planetary meshing teeth 56s may be formed integrally with the second tooth portion 56g or may be formed separately therefrom.

[0031] The sun gear 57 is an output gear that meshes with the planetary gears 53 on the inside. The sun gear 57 is an external gear formed in a disk shape centered on the first center line O1. The sun gear 57 has a smaller outer diameter than the planetary gears 53. The sun gear 57 is not limited to being disk-shaped and may be cylindrical. In other words, there are no limitations on the thickness of the sun gear 57. Furthermore, the sun gear 57 is not limited to having a smaller outer diameter than the planetary gears 53. Therefore, the size of the sun gear 57 may be the same as or larger than the planetary gears 53.

[0032] As shown in FIG. 2, the sun shaft 58 is an output shaft having a sun gear 57 fixed to one end thereof (the end closest to the driving machine 2). The sun shaft 58 rotates about the first center line O1 together with the sun gear 57, to which the rotation of the planetary gear 53 is transmitted. The sun shaft 58 is formed in a cylindrical shape with its center on the first center line O1. The axis of the sun shaft 58 coincides with the first center line O1 of the counter shaft 45. In other words, the sun shaft 58 is disposed parallel to the drive shaft 21 and shifted radially outward.

[0033] The second bearing 59 supports the sun shaft 58 rotatably relative to the transmission casing 60. The second bearing 59 is fixed to the first gear support portion 55A. The second bearing 59 in this embodiment is a tilting pad bearing. The second bearing 59 is disposed in a position closer to the compressor 3 than the sun gear 57. The second bearing 59 is not limited to a structure in which it is fixed to the first gear support portion 55A as long as it is immovable relative to the transmission casing 60. For example, the second bearing 59 may be fixed directly to the transmission casing 60. The second bearing 59 may also be a bearing to which a damping function is added to attenuate vibrations of the sun shaft 58.

[0034] The transmission casing 60 accommodates the plurality of planetary gears 53, the plurality of planetary gear shafts 54, the gear support portion 55, the second gear 56A, the sun gear 57, the sun shaft 58, and the second bearing 59. The transmission casing 60 is formed in a cylindrical shape with an opening on a second side Da2 in the axial direction Da. The opening on the second side Da2 in the axial direction Da of the transmission casing 60 forms a second insertion hole 60h large enough to allow the first gear 48A to pass through. As shown in FIG. 2 , the transmission casing 60 of this embodiment includes a lower half casing 61 and an upper half casing 62.

[0035] The lower half casing 61 covers, from a downward position Dvb in the vertical direction Dv, the plurality of planetary gears 53, the plurality of planetary gear shafts 54, the gear support portion 55, the second gear 56A, the sun gear 57, the sun shaft 58, and the second bearing 59. As shown in Fig. 3, the lower half casing 61 has, for example, a semicircular cross-sectional shape when viewed from the axial direction Da, and opens toward an upward position Dvu in the vertical direction Dv.

[0036] The upper half casing 62 covers the plurality of planetary gears 53, the plurality of planetary gear shafts 54, the gear support portion 55, the second gear 56A, the sun gear 57, the sun shaft 58, and the second bearing 59 from an upper Dvu in the vertical direction Dv. The upper half casing 62 has, for example, a semicircular cross-sectional shape when viewed from the axial direction Da, and opens toward a lower Dvb in the vertical direction Dv. The upper half casing 62 is detachably connected to the lower half casing 61 by fixing members such as bolts at both ends in the circumferential direction Dc.

[0037] 1 and 2, the sun shaft 58 penetrates the transmission casing 60 so that the tip of the first side Da1 in the axial direction Da is disposed inside the transmission casing 60. Note that the sun shaft 58 is not limited to a structure in which it penetrates the transmission casing 60 so that the tip is disposed inside the transmission casing 60. When a joint is used, the sun shaft 58 only needs to be housed inside the transmission casing 60, and does not have to be structured to penetrate the transmission casing 60.

[0038] The rotating machine system 1A of this embodiment further includes a coupling 100 and a coupling cover 120. The coupling 100 connects an end of the sun shaft 58 on a second side Da2 in the axial direction Da to an end of the rotating machine shaft 35 of the compressor 3. An end of the coupling 100 on a first side Da1 in the axial direction Da is detachably connected to the sun shaft 58 with a fixing member such as a bolt. An end of the coupling 100 on the second side Da2 in the axial direction Da is detachably connected to the rotating machine shaft 35 with a fixing member such as a bolt.

[0039] The coupling cover 120 covers the coupling 100 between the transmission casing 60 and the compressor 3. As shown in FIG. 2, the coupling cover 120 of this embodiment includes a lower cover 121 and an upper cover 122.

[0040] The lower cover 121 covers the coupling 100, the end of the sun shaft 58 connected to the coupling 100, and the end of the rotating machine shaft 35 from a downward direction Dvb in the vertical direction Dv. The lower cover 121 has, for example, a semicircular cross-sectional shape when viewed from the axial direction Da, and is open toward an upward direction Dvu in the vertical direction Dv. The lower cover 121 is detachable from the foundation.

[0041] The upper cover 122 covers the coupling 100, the end of the sun shaft 58 connected to the coupling 100, and the end of the rotating machine shaft 35 from above Dvu in the vertical direction Dv. The upper cover 122 has, for example, a semicircular cross-sectional shape when viewed from the axial direction Da, and opens toward a downward direction Dvb in the vertical direction Dv. The upper cover 122 is detachably connected to the lower cover 121 by fixing members such as bolts at both ends in the circumferential direction Dc.

[0042] (Maintenance method for rotating machinery systems) Next, a maintenance method S10 for the rotating machine system 1A described above will be described. As shown in Fig. 4, the maintenance method S10 for the rotating machine system 1A according to the embodiment of the present disclosure includes a step S11 of removing a cover, a step S12 of releasing the meshing between the first gear 48A and the second gear 56A, a step S13 of performing maintenance, a step S14 of meshing the first gear 48A and the second gear 56A, and a step S15 of attaching the cover.

[0043] In the cover removal step S11, the upper half casing 62 and the lower half casing 61 of the transmission casing 60 are released from the fastening members. Similarly, the upper cover 122 and the lower cover 121 are released from the fastening members. Thereafter, as shown in FIG. 5, the upper half casing 62 is removed from the lower half casing 61. This exposes the portion Dvu above the vertical direction Dv of the planetary gear mechanism 50. Thereafter, the upper cover 122 and the lower cover 121 are removed. This exposes the coupling 100.

[0044] In step S12 of disengaging the first gear 48A from the second gear 56A, as shown in FIG. 6 , at least one of the transmission unit 4A and the transmission 5 is moved relatively away from each other in the axial direction Da. In this embodiment, the transmission 5 is moved to the second side Da2 in the axial direction Da, thereby moving the transmission 5 away from the transmission unit 4A in the axial direction Da. Specifically, the coupling 100 is removed from the sun shaft 58 and the rotating machine shaft 35. Then, using the space created by removing the coupling 100 and the coupling cover 120, the transmission 5 is moved closer to the compressor 3. At this time, the first tooth portion 48g and the second tooth portion 56g are spur teeth whose tooth traces are parallel to the central axis O. Therefore, by moving the first gear 48A of the transmission part 4A and the second gear 56A of the transmission 5 relatively apart in the axial direction Da along which the central axis O extends, the meshing between the first gear 48A and the second gear 56A is released.

[0045] In the maintenance step S13, required maintenance is performed on at least one of the transmission unit 4A and the transmission 5. In the present embodiment, the content of the maintenance performed in step S13 is not limited. The transmission unit 4A has a first insertion hole 40h formed in the casing 40. Therefore, the condition inside the casing 40 can be visually confirmed through this first insertion hole 40h. Furthermore, with the transmission 5, maintenance work can be performed on the planetary gear mechanism 50 inside it with the upper half casing 62 removed. Because the coupling 100 of the transmission 5 has been removed and the transmission 5 is no longer connected to the compressor 3, the transmission 5 may be removed from the rotating machine system 1A by a crane or the like to perform maintenance.

[0046] In step S14 of meshing the first gear 48A and the second gear 56A, after the required maintenance in step S13 is completed, the first gear 48A and the second gear 56A are meshed together. To do this, at least one of the transmission unit 4A and the transmission 5 is moved relatively toward each other in the axial direction Da, thereby meshing the first gear 48A and the second gear 56A. In this embodiment, the transmission 5 is moved toward the first side Da1 in the axial direction Da, thereby moving the transmission 5 toward the transmission unit 4A in the axial direction Da. At this time, the first tooth portion 48g and the second tooth portion 56g are spur teeth whose tooth traces are parallel to the central axis O. Therefore, by relatively moving the first gear 48A of the transmission unit 4A and the second gear 56A of the transmission 5 toward each other in the axial direction Da, the first gear 48A and the second gear 56A can be meshed together.

[0047] In the cover attachment step S15, the coupling 100 is attached to the sun shaft 58 and the rotating machine shaft 35. Then, the upper cover 122 and the lower cover 121 are attached. Furthermore, the upper half casing 62 is attached to the lower half casing 61. In this manner, the maintenance of the rotating machine system 1A is completed.

[0048] (Action and effect) In the rotating machine system 1A and the maintenance method S10 of this embodiment, the transmission unit 4A and the transmission 5 are configured such that the first gear 48A of the transmission unit 4A meshes with the second gear 56A of the transmission 5. As a result, the rotation of the drive shaft 21 transmitted to the transmission unit 4A is transmitted to the transmission 5. As a result, the rotation of the drive shaft 21 is transmitted to the rotating machine shaft 35 of the compressor 3 via the transmission unit 4A and the transmission 5. Furthermore, the first tooth portion 48g and the second tooth portion 56g that mesh with each other are spur teeth whose tooth traces are parallel to the central axis O. Therefore, the first gear 48A of the transmission unit 4A and the second gear 56A of the transmission 5 can be moved relative to each other in the axial direction Da. Therefore, by relatively moving at least one of the transmission unit 4A and the transmission 5 so as to move away from each other in the axial direction Da, the meshing state between the first gear 48A and the second gear 56A can be switched. This allows the transmission unit 4A and the transmission 5 to be easily disassembled and assembled when performing maintenance on at least one of the transmission unit 4A and the transmission 5. In other words, the process can be easily shifted to maintenance work. In this way, the work of disconnecting and connecting the transmission unit 4A and the transmission 5 can be easily performed, improving the maintainability of the rotating machine system 1A.

[0049] Furthermore, the first gear 48A is disposed outside the casing 40. This makes it easier to visually check the meshing state between the first gear 48A and the second gear 56A when performing disconnection and connection operations between the transmission unit 4A and the transmission 5. This further improves the maintainability of the rotating machine system 1A.

[0050] Furthermore, the first insertion hole 40h formed in the casing 40 is sized to allow the first gear 48A to be inserted therethrough, so the internal condition of the casing 40 of the transmission unit 4A can be easily visually checked through the first insertion hole 40h, thereby improving the maintainability of the transmission unit 4A.

[0051] Furthermore, the transmission casing 60 can be separated into a lower half casing 61 and an upper half casing 62. Therefore, the upper half casing 62 can be removed from the lower half casing 61 when performing the work of disengaging the meshing between the first gear 48A and the second gear 56A and the work of engaging the first gear 48A and the second gear 56A. Therefore, the meshing state between the first gear 48A and the second gear 56A can be switched while visually checking the meshing state between the first gear 48A and the second gear 56A. Furthermore, maintenance work on the inside of the transmission 5 can be easily performed. Therefore, the maintainability of the rotating machine system 1A can be further improved.

[0052] Furthermore, the coupling cover 120 that covers the coupling 100 that connects the sun shaft 58 and the rotating machine shaft 35 can be separated into a lower cover 121 and an upper cover 122. By removing the upper cover 122 from the lower cover 121, the coupling 100 can be removed and the sun shaft 58 and the rotating machine shaft 35 can be easily released from each other. As a result, space can be easily secured between the transmission 5 and the compressor 3. In other words, space can be easily secured to move the transmission 5 away from the transmission unit 4A in the axial direction Da. This makes it possible to move the transmission 5 to change the meshing state between the first gear 48A and the second gear 56A. Therefore, the maintainability of the rotating machine system 1A can be further improved.

[0053] In the rotating machine system 1A of this embodiment, the driving machine 2 is a motor, and the compressor 3 is a compressor. As a result, in the rotating machine system 1A in which the compressor is driven by a motor, the transmission unit 4A and each transmission 5 can be easily disconnected and connected, thereby improving the ease of maintenance.

[0054] Second Embodiment Next, a second embodiment of a rotating machine system according to the present disclosure will be described. In the second embodiment described below, components common to the first embodiment will be denoted by the same reference numerals in the drawings, and descriptions thereof will be omitted.

[0055] As shown in FIG. 7, in a rotating machine system 1B of the second embodiment, the configuration of the connection portion between a transmission unit 4B and a transmission 5B is different from that of the first embodiment.

[0056] In the transmission unit 4B, the configuration of the first gear 48B is different. The first gear 48B is fixed to the counter shaft 45B. The first gear 48B rotates integrally with the counter shaft 45B around the first center line O1. The first gear 48B is fixed to the end of the counter shaft 45B on the second side Da2 in the axial direction Da. The first gear 48B is disposed outside the casing 40 so as to protrude from the casing 40 to the second side Da2 in the axial direction Da. The first gear 48A is an external gear formed in a circular plate shape centered on the first center line O1. The first gear 48B in the second embodiment has a smaller outer diameter than the counter gear 46. The first gear 48B is an external gear formed in a circular plate shape centered on the first center line O1. The first gear 48B is a spur gear having a plurality of first tooth portions 48g, which are spur teeth whose tooth traces are parallel to the first center line O.

[0057] The transmission 5B of the second embodiment has a gear mechanism 70. A plurality of gear mechanisms 70 (three in this embodiment) are arranged to surround the main shaft 41. Each gear mechanism 70 is connected to a corresponding compressor 3 in a one-to-one relationship. The gear mechanism 70 transmits the rotation of the main shaft 41 to the rotating mechanical shaft 35 of the corresponding compressor 3. The multiple gear mechanisms 70 have the same configuration. The gear mechanism 70 has multiple planetary gears 53, multiple planetary gear shafts 54, a gear support portion 55, a second gear 56B, an outer peripheral gear 71, a sun gear 57, a sun shaft (output shaft) 58, and a second bearing 59.

[0058] The second gear 56B meshes with the first gear 48B. The second gear 56B is disposed within the transmission casing 60. The second gear 56B is a disc-shaped external gear centered on the first center line O1. When viewed from the axial direction Da, the second gear 56B has a through hole 56k formed in its central portion. The second gear 56B has second teeth 56g on the inner circumferential surface of the through hole 56k. A plurality of second teeth 56g are formed at intervals in the circumferential direction Dc of the second gear 56B. Each second teeth 56g is a spur tooth whose tooth trace is parallel to the central axis O. The second teeth 56g mesh with the first teeth 48g. The number of teeth of the first teeth 48g is the same as the number of teeth of the second teeth 56g. The second teeth 56g are disposed between adjacent first teeth 48g in the circumferential direction Dc. That is, the first gear 48B is spline-fitted into the through hole 56k of the second gear 56B. When the second gear 56B is in mesh with the first gear 48B, the second teeth 56g are in contact with the first teeth 48g. As a result, the second gear 56B rotates integrally with the countershaft 45B.

[0059] The second gear 56B in the second embodiment is an external gear that further has a plurality of external teeth 56t on its outer circumferential surface. The second gear 56B has, for example, the same outer diameter as the sub gear 46. However, the second gear 56B is not limited to having the same outer diameter as the sub gear 46. For example, the second gear 56B may have an outer diameter larger or smaller than that of the sub gear 46. One second gear 56B is arranged corresponding to one sub gear 46.

[0060] The peripheral gear 71 is arranged on the outer side Dro in the radial direction Dr centered on the first center line O1 with respect to the second gear 56B. The peripheral gear 71 is a gear different from the planetary gear 53. The peripheral gear 71 is fixed to the planetary gear shaft 54 ​​at a position away from the planetary gear 53 on the first side Da1 in the axial direction Da. The peripheral gear 71 is arranged at a position closer to the driving machine 2 with respect to the planetary gear 53. The peripheral gear 71 is an external gear formed in a circular plate shape centered on the second center line O2. The peripheral gear 71 meshes with a plurality of external teeth 56t formed on the outer peripheral surface of the second gear 56B.

[0061] The outer diameter of the outer gear 71 is, for example, smaller than that of the planetary gear 53. However, the outer diameter of the outer gear 71 is not limited to being smaller than that of the planetary gear 53. For example, the outer diameter of the outer gear 71 may be larger than or the same as that of the planetary gear 53. A plurality of outer gears 71 are arranged so that one corresponds to one planetary gear 53. The plurality of outer gears 71 rotate about the second center line O2. The positions of the outer gear 71 and the second gear 56B in the axial direction Da overlap with the first gear 48B.

[0062] In this rotating machine system 1B, as in the first embodiment, when performing maintenance on the rotating machine system 1B, the first gear 48B and the second gear 56B can be easily disengaged from each other and the first gear 48B and the second gear 56B can be easily engaged with each other by relatively moving at least one of the transmission unit 4B and the transmission 5B in the axial direction Da. In other words, maintenance of the rotating machine system 1B can be performed in the same manner as the maintenance method S10 for the rotating machine system 1A shown in Fig. 4 in the first embodiment.

[0063] (Action and effect) In this rotating machine system 1B, the first gear 48B of the transmission unit 4B and the second gear 56B of the transmission 5B can be moved relative to each other in the axial direction Da. This makes it possible to easily perform disconnection and connection operations between the transmission unit 4B and the transmission 5B, thereby improving the maintainability of the rotating machine system 1B.

[0064] (Other embodiments) The above describes in detail the embodiments of the present disclosure with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes and the like are also included within the scope that does not deviate from the gist of the present disclosure.

[0065] In this embodiment, the sun shaft 58 is rotated at a peripheral speed of 10,000 rpm or more to operate the multiple compressors 3 at high speed, but the multiple compressors 3 may have different rotation speeds as long as they are operated at high speed. In other words, the first compressor 31, the second compressor 32, and the third compressor may be operated at different rotation speeds.

[0066] In addition, in the above embodiment, the compressor 3 is exemplified as a rotary machine, but the rotary machine may be of any application, configuration, etc. For example, the rotary machine may be a drive system around a propeller shaft provided on a ship or the like, or a wind turbine, etc.

[0067] <Additional Notes> The rotating machine systems 1A and 1B and the maintenance method S10 for the rotating machine systems 1A and 1B described in the respective embodiments can be understood, for example, as follows.

[0068] (1) The rotary machine systems 1A and 1B according to the first aspect include a driving machine 2 having a drive shaft 21 that is driven to rotate around a central axis O, a transmission unit 4A and 4B including a main shaft 41 connected to the drive shaft 21, a main gear 42 fixed to the main shaft 41, a sub-gear 46 that meshes with the main gear 42, countershafts 45 and 45B fixed to the sub-gear 46, and first gears 48A and 48B that rotate integrally with the countershafts 45 and 45B, and second gears 56A and 56B that mesh with the first gears 48A and 48B, and a transmission unit 4A and 4B including a main shaft 41 connected to the drive shaft 21, a main gear 42 fixed to the main shaft 41, a sub-gear 46 that meshes with the main gear 42, countershafts 45 and 45B, and first gears 48A and 48B that rotate integrally with the countershafts 45 and 45B. and a rotating machine 3 having a rotating machine shaft 35 connected to the output shaft 58, such that the rotation of the output shaft 58 is transmitted to the rotating machine shaft 35, thereby driving the rotation of the rotating machine shaft 35. The first gears 48A, 48B are spur gears having a plurality of first tooth portions 48g, each of which is a spur tooth whose tooth trace is parallel to the central axis O, and the second gears 56A, 56B are spur tooth whose tooth trace is parallel to the central axis O, and each of which has a plurality of second tooth portions 56g, each of which is a spur tooth whose tooth trace is parallel to the central axis O, and which is disposed between adjacent first tooth portions 48g. Examples of the driving machine 2 include a motor and a steam turbine. Examples of the rotary machine 3 include a compressor, a drive system around a propeller shaft provided on a ship or the like, and a wind turbine.

[0069] In the rotating machine systems 1A and 1B, the transmission units 4A and 4B and the transmissions 5 and 5B are configured such that first gears 48A and 48B of the transmission units 4A and 4B mesh with second gears 56A and 56B of the transmissions 5 and 5B. As a result, the rotation of the drive shaft 21 transmitted to the transmission units 4A and 4B is transmitted to the transmissions 5 and 5B. As a result, the rotation of the drive shaft 21 is transmitted to the rotating machine shaft 35 of the compressor 3 via the transmission units 4A and 4B and the transmissions 5 and 5B. Furthermore, the first tooth portion 48g and the second tooth portion 56g that mesh with each other are spur teeth whose tooth traces are parallel to the central axis O. Therefore, the first gear 48A and the second gear 56A can move relative to each other in the axial direction Da. Therefore, by relatively moving at least one of the transmission units 4A, 4B and the transmissions 5, 5B away from each other in the axial direction Da, the meshing state between the first gear 48A and the second gear 56A can be switched. This allows the transmission units 4A, 4B and the transmissions 5, 5B to be easily disassembled and assembled when performing maintenance on at least one of the transmission units 4A, 4B and the transmissions 5, 5B. In other words, the process can be easily shifted to maintenance work. In this way, the disconnection and connection work between the transmission units 4A, 4B and the transmissions 5, 5B can be easily performed, improving the maintainability of the rotating machine systems 1A, 1B.

[0070] (2) The rotating machine systems 1A and 1B according to the second aspect are the rotating machine systems 1A and 1B of (1), in which the transmission units 4A and 4B have a casing 40 that covers the main shaft 41, the main gear 42, the sub-gear 46, and the sub-shafts 45 and 45B, and the first gears 48A and 48B are arranged outside the casing 40.

[0071] This makes it easier to visually check the meshing state between the first gears 48A, 48B and the second gears 56A, 56B when disconnecting and connecting the transmission units 4A, 4B and the transmissions 5, 5B, thereby further improving the maintainability of the rotating machine systems 1A, 1B.

[0072] (3) The rotating machine systems 1A, 1B according to a third aspect are the rotating machine systems 1A, 1B of (2), in which the casing 40 is formed to a size that allows the first gears 48A, 48B to be inserted therethrough, has insertion holes 40h through which the countershafts 45, 45B are inserted, and the first gears 48A, 48B are fixed to the ends of the countershafts 45, 45B that protrude from the casing 40 through the insertion holes 40h.

[0073] This makes it easier to visually check the internal state of the casing 40 of the transmission parts 4A, 4B through the first insertion holes 40h, thereby improving the maintainability of the transmission parts 4A, 4B.

[0074] (4) The rotating machine system 1A, 1B according to the fourth aspect is the rotating machine system 1A, 1B of (2) or (3), wherein the transmission 5, 5B comprises a transmission casing 60, and the transmission casing 60 comprises a lower half casing 61 covering the second gears 56A, 56B and the output shaft 58 from below Dvb in the vertical direction Dv, and an upper half casing 62 covering the second gears 56A, 56B and the output shaft 58 from above Dvu in the vertical direction Dv and arranged so as to be detachable from the lower half casing 61.

[0075] This allows the upper half casing 62 to be removed from the lower half casing 61 when performing the work of disengaging the meshing between the first gears 48A, 48B and the second gears 56A, 56B and the work of engaging the first gears 48A, 48B with the second gears 56A, 56B. Therefore, the meshing state between the first gears 48A, 48B and the second gears 56A, 56B can be switched while visually checking the meshing state between the first gears 48A, 48B and the second gears 56A, 56B. Furthermore, maintenance work on the inside of the transmission 5 can be easily performed. This further improves the maintainability of the rotating machine systems 1A, 1B.

[0076] (5) The rotating machine system 1A, 1B according to the fifth aspect is any one of the rotating machine systems 1A, 1B of (1) to (4), and further comprises a coupling 100 that detachably connects the output shaft 58 and the rotating machine shaft 35, and a coupling cover 120 that covers the coupling 100, and the coupling cover 120 comprises a lower cover 121 that covers the coupling 100 from below Dvb in the vertical direction Dv, and an upper cover 122 that covers the coupling 100 from above Dvu in the vertical direction Dv and is arranged detachably relative to the lower cover 121.

[0077] This makes it easy to remove the coupling 100 and release the sun shaft 58 from the rotating machine shaft 35 by removing the upper cover 122 from the lower cover 121. As a result, space can be easily secured between the transmission 5, 5B and the compressor 3. That is, space can be easily secured to move the transmission 5, 5B away from the transmission units 4A, 4B in the axial direction Da. This makes it possible to move the transmission 5, 5B to switch the meshing state between the first gears 48A, 48B and the second gears 56A, 56B. This further improves the maintainability of the rotating machine systems 1A, 1B.

[0078] (6) A rotating machine system 1A according to a sixth aspect is any one of the rotating machine systems 1A of (1) to (5), in which the second gear 56A is an internal gear having the second tooth portion 56g on its inner circumferential surface.

[0079] (7) A rotating machine system 1B according to a seventh aspect is any one of the rotating machine systems 1B of (1) to (5), in which the second gear 56B is an external gear having the second tooth portion 56g on its inner circumferential surface and further having a plurality of teeth on its outer circumferential surface.

[0080] (8) The rotating machine system 1A, 1B according to the eighth aspect is any one of the rotating machine systems 1A, 1B of (1) to (7), wherein the transmission unit 4A, 4B has a plurality of countershafts 45, 45B arranged radially outside the main shaft 41 at intervals in the circumferential direction with respect to the main shaft 41, and includes a plurality of the transmissions 5, 5B and the rotating machines 3 to which the rotation of each of the countershafts 45, 45B is transmitted so as to correspond to each of the plurality of countershafts 45, 45B.

[0081] As a result, the transmission units 4A, 4B include a plurality of countershafts 45, 45B arranged radially outward of the main shaft 41 at intervals in the circumferential direction, with the transmissions 5, 5B and rotary machines 3 arranged corresponding to the respective countershafts 45, 45B. In this configuration, first gears 48A, 48B that rotate integrally with the respective countershafts 45, 45B mesh with second gears 56A, 56B of the transmissions 5, 5B corresponding to the respective countershafts 45, 45B. The first gears 48A, 48B of the respective countershafts 45, 45B and the second gears 56A, 56B of the transmissions 5, 5B corresponding to the respective countershafts 45, 45B can be moved relative to each other in the axial direction Da along the central axis O. This facilitates the connection and disconnection of the transmission units 4A, 4B from the respective transmissions 5, 5B.

[0082] (9) The rotating machine systems 1A and 1B according to a ninth aspect are the rotating machine systems 1A and 1B of any one of (1) to (8), in which the driving machine 2 is a motor and the rotating machine 3 is a compressor.

[0083] This makes it easy to disconnect and connect the transmission parts 4A, 4B and the respective transmissions 5, 5B in the rotary machine systems 1A, 1B that drive the compressors by motors, thereby improving maintainability.

[0084] (10) A maintenance method S10 for rotary machine systems 1A and 1B according to a tenth aspect includes a transmission unit including a driving machine 2 having a drive shaft 21 that is driven to rotate around a central axis O, a main shaft 41 connected to the drive shaft 21, a main gear 42 fixed to the main shaft 41, a sub-gear 46 that meshes with the main gear 42, countershafts 45 and 45B fixed to the sub-gear 46, and first gears 48A and 48B that rotate integrally with the countershafts 45 and 45B. a transmission 5, 5B including second gears 56A, 56B meshing with the first gears 48A, 48B, and an output shaft 58 that changes the rotation speed of the second gears 56A, 56B and outputs the changed speed; and a rotating machine 3 having a rotating machine shaft 35 connected to the output shaft 58, wherein the rotating machine shaft 35 is rotationally driven by the transmission of rotation of the output shaft 58, and the first gears 48A, 48B have spur teeth whose tooth traces are parallel to the central axis O. A maintenance method S10 for a rotating machine system 1A, 1B in which the second gears 56A, 56B have a plurality of first tooth portions 48g, and the second gears 56A, 56B have spur teeth whose tooth traces are parallel to the central axis O, and have a plurality of second tooth portions 56g arranged between adjacent first tooth portions 48g, is provided, wherein at least one of the transmission units 4A, 4B and the transmissions 5, 5B is relatively moved away from each other in an axial direction Da in which the central axis O extends, The method includes a step S12 of releasing the meshing between the first gears 48A, 48B and the second gears 56A, 56B, a step S13 of performing maintenance on at least one of the transmission parts 4A, 4B and the transmissions 5, 5B, and a step S14 of relatively moving at least one of the transmission parts 4A, 4B and the transmissions 5, 5B so as to approach the axial direction Da, thereby meshing the first gears 48A, 48B and the second gears 56A, 56B.

[0085] In the maintenance method S10 for the rotating machine systems 1A, 1B, the transmission units 4A, 4B and the transmissions 5, 5B are configured such that the first gears 48A, 48B of the transmission units 4A, 4B mesh with the second gears 56A, 56B of the transmissions 5, 5B. This allows the rotation of the drive shaft 21 transmitted to the transmission units 4A, 4B to be transmitted to the transmissions 5, 5B. As a result, the rotation of the drive shaft 21 is transmitted to the rotating machine shaft 35 of the compressor 3 via the transmission units 4A, 44 and the transmissions 5, 5B. Furthermore, the first tooth portion 48g and the second tooth portion 56g that mesh with each other are spur teeth whose tooth traces are parallel to the central axis O. Therefore, the first gear 48A and the second gear 56A can be moved relative to each other in the axial direction Da. Therefore, by relatively moving at least one of the transmission units 4A, 4B and the transmissions 5, 5B away from each other in the axial direction Da, the meshing state between the first gear 48A and the second gear 56A can be switched. This allows the transmission units 4A, 4B and the transmissions 5, 5B to be easily disassembled and assembled when performing maintenance on at least one of the transmission units 4A, 4B and the transmissions 5, 5B. In other words, the process can be easily shifted to maintenance work. In this way, the disconnection and connection work between the transmission units 4A, 4B and the transmissions 5, 5B can be easily performed, improving the maintainability of the rotating machine systems 1A, 1B. [Explanation of symbols]

[0086] 1A, 1B...Rotating machine system 2...Driver 3...Compressor (rotating machine) 4A, 4B...Transmission section 5, 5B...Gearbox 21...Drive shaft 31...First compressor 32...Second compressor 35...Rotating machine shaft 40...Casing 40h...First insertion hole (insertion hole) 41...Spindle 42...Main gear 43...Main shaft bearing 45, 45B…Subshaft 46...Sub gear 47...First bearing 48A, 48B...First gear 48g…First tooth part 50...Planetary gear mechanism 50A...First planetary gear mechanism 50B...Second planetary gear mechanism 53...Planetary gear 54...Planetary gear shaft 55...Gear support part 55A...First gear support part 55B...Second gear support part 56A, 56B...Second gear 56g…Second tooth part 56k...Through hole 56s...planetary meshing teeth 56t…external teeth 57...Sun gear 58...Sun shaft (output shaft) 59...Second bearing 60...Transmission casing 60h...Second insertion hole 61...Lower casing 62...Upper casing 70...Gear mechanism 71...Peripheral gear 100...Coupling 120...Coupling cover 121...Lower cover 122...Upper cover Da…Axis direction Da1...first side Da2...the second side Dc…Circumferential direction Dr…Radial direction Dri…inside Dro...outside Dv: vertical direction Dvu…upper Dvb…downward O…Central axis O1…first center line O2…Second center line S10...Maintenance method for rotating machinery systems S11: Removing the cover S12: A process of releasing the meshing between the first gear and the second gear S13: Maintenance process S14: A process of meshing the first gear with the second gear S15: Cover installation process

Claims

1. a driving machine having a driving shaft that is driven to rotate around a central axis; a transmission unit including a main shaft connected to the drive shaft, a main gear fixed to the main shaft, a sub gear meshing with the main gear, a sub shaft fixed to the sub gear, and a first gear rotating integrally with the sub shaft; a transmission including a second gear that meshes with the first gear and an output shaft that changes the rotation speed of the second gear and outputs the rotation speed; a rotating machine having a rotating machine shaft connected to the output shaft, the rotating machine shaft being rotationally driven by rotation of the output shaft being transmitted thereto; the first gear is a spur gear having a plurality of first tooth portions, each of which is a spur tooth whose tooth trace is parallel to the central axis, the second gear has spur teeth whose tooth traces are parallel to the central axis and includes a plurality of second tooth portions disposed between adjacent first tooth portions, the transmission unit has a casing that covers the main shaft, the main gear, the sub gear, and the sub shaft, The first gear is disposed outside the casing.

2. the casing has a size that allows the first gear to be inserted therethrough and has an insertion hole through which the countershaft is inserted, The rotary machine system according to claim 1 , wherein the first gear is fixed to an end of the countershaft that protrudes from the casing through the insertion hole.

3. the transmission includes a transmission casing; The transmission casing includes: a lower half casing that covers the second gear and the output shaft from below in the vertical direction; 3. The rotating machine system according to claim 1, further comprising: an upper half casing that covers the second gear and the output shaft from above in the vertical direction and is detachably disposed relative to the lower half casing.

4. a coupling that detachably connects the output shaft and the rotating machine shaft; a coupling cover that covers the coupling, The coupling cover is a lower cover that covers the coupling from below in the vertical direction; The rotating machine system according to claim 1 , further comprising: an upper cover that covers the coupling from above in the vertical direction and is disposed detachably with respect to the lower cover.

5. A drive machine having a drive shaft that is driven to rotate around a central axis; a transmission unit including a main shaft connected to the drive shaft, a main gear fixed to the main shaft, a sub gear meshing with the main gear, a sub shaft fixed to the sub gear, and a first gear rotating integrally with the sub shaft; a transmission including a second gear that meshes with the first gear and an output shaft that changes the rotation speed of the second gear and outputs the rotation speed; a rotating machine having a rotating machine shaft connected to the output shaft, the rotating machine shaft being rotationally driven by the rotation of the output shaft being transmitted thereto; the first gear is a spur gear having a plurality of first tooth portions, each of which is a spur tooth whose tooth trace is parallel to the central axis, the second gear has spur teeth whose tooth traces are parallel to the central axis and includes a plurality of second tooth portions disposed between adjacent first tooth portions, a coupling that detachably connects the output shaft and the rotating machine shaft; a coupling cover that covers the coupling, The coupling cover is a lower cover that covers the coupling from below in the vertical direction; an upper cover that covers the coupling from above in the vertical direction and is detachably disposed relative to the lower cover.

6. The rotating machine system according to claim 1 , wherein the second gear is an internal gear having the second teeth portion on an inner peripheral surface thereof.

7. A drive machine having a drive shaft that is driven to rotate around a central axis; a transmission unit including a main shaft connected to the drive shaft, a main gear fixed to the main shaft, a sub gear meshing with the main gear, a sub shaft fixed to the sub gear, and a first gear rotating integrally with the sub shaft; a transmission including a second gear that meshes with the first gear and an output shaft that changes the rotation speed of the second gear and outputs the rotation speed; a rotating machine having a rotating machine shaft connected to the output shaft, the rotating machine shaft being rotationally driven by the rotation of the output shaft being transmitted thereto; the first gear is a spur gear having a plurality of first tooth portions, each of which is a spur tooth whose tooth trace is parallel to the central axis, the second gear has spur teeth whose tooth traces are parallel to the central axis and includes a plurality of second tooth portions disposed between adjacent first tooth portions, The second gear is an internal gear having the second tooth portion on its inner peripheral surface.

8. The rotating machine system according to claim 1 , wherein the second gear is an external gear having the second tooth portion on an inner circumferential surface and further having a plurality of teeth on an outer circumferential surface.

9. A drive machine having a drive shaft that is driven to rotate around a central axis; a transmission unit including a main shaft connected to the drive shaft, a main gear fixed to the main shaft, a sub gear meshing with the main gear, a sub shaft fixed to the sub gear, and a first gear rotating integrally with the sub shaft; a transmission including a second gear that meshes with the first gear and an output shaft that changes the rotation speed of the second gear and outputs the rotation speed; a rotating machine having a rotating machine shaft connected to the output shaft, the rotating machine shaft being rotationally driven by rotation of the output shaft being transmitted thereto; the first gear is a spur gear having a plurality of first tooth portions, each of which is a spur tooth whose tooth trace is parallel to the central axis, the second gear has spur teeth whose tooth traces are parallel to the central axis and includes a plurality of second tooth portions disposed between adjacent first tooth portions, a rotating machine system, wherein the second gear is an external gear having the second tooth portion on an inner peripheral surface and further having a plurality of teeth on an outer peripheral surface;

10. The transmission unit is a plurality of counter shafts are arranged radially outward of the main shaft at intervals in the circumferential direction, The rotating machine system according to claim 1 , further comprising a plurality of the transmissions and the rotating machines to which the rotation of each of the countershafts is transmitted, the transmissions and the rotating machines corresponding to the plurality of countershafts, respectively.

11. A drive machine having a drive shaft that is driven to rotate around a central axis; a transmission unit including a main shaft connected to the drive shaft, a main gear fixed to the main shaft, a sub gear meshing with the main gear, a sub shaft fixed to the sub gear, and a first gear rotating integrally with the sub shaft; a transmission including a second gear that meshes with the first gear and an output shaft that changes the rotation speed of the second gear and outputs the rotation speed; a rotating machine having a rotating machine shaft connected to the output shaft, the rotating machine shaft being rotationally driven by rotation of the output shaft being transmitted thereto; the first gear is a spur gear having a plurality of first tooth portions, each of which is a spur tooth whose tooth trace is parallel to the central axis, the second gear has spur teeth whose tooth traces are parallel to the central axis and includes a plurality of second tooth portions disposed between adjacent first tooth portions, The transmission unit is a plurality of counter shafts are arranged radially outward of the main shaft at intervals in the circumferential direction, A rotating machine system including a plurality of the transmissions and the rotating machines to which the rotation of each of the secondary shafts is transmitted, so as to correspond to each of the secondary shafts.

12. The rotating machine system according to claim 1 , wherein the driving machine is a motor and the rotating machine is a compressor.

13. A drive machine having a drive shaft that is driven to rotate around a central axis; a transmission unit including a main shaft connected to the drive shaft, a main gear fixed to the main shaft, a sub gear meshing with the main gear, a sub shaft fixed to the sub gear, and a first gear rotating integrally with the sub shaft; a transmission including a second gear that meshes with the first gear and an output shaft that changes the rotation speed of the second gear and outputs the rotation speed; a rotating machine having a rotating machine shaft connected to the output shaft, the rotating machine shaft being rotationally driven by rotation of the output shaft being transmitted thereto; the first gear is a spur gear having a plurality of first tooth portions, each of which is a spur tooth whose tooth trace is parallel to the central axis, the second gear has spur teeth whose tooth traces are parallel to the central axis and includes a plurality of second tooth portions disposed between adjacent first tooth portions, A rotary machine system in which the driving machine is a motor and the rotary machine is a compressor.

14. a driving machine having a driving shaft that is driven to rotate around a central axis; a transmission unit including a main shaft connected to the drive shaft, a main gear fixed to the main shaft, a sub gear meshing with the main gear, a sub shaft fixed to the sub gear, and a first gear rotating integrally with the sub shaft; a transmission including a second gear that meshes with the first gear and an output shaft that changes the rotation speed of the second gear and outputs the rotation speed; a rotating machine having a rotating machine shaft connected to the output shaft, the rotating machine shaft being rotationally driven by rotation of the output shaft being transmitted thereto; the first gear has a plurality of first tooth portions each of which is a spur tooth whose tooth trace is parallel to the central axis, a maintenance method for a rotary machine system, wherein the second gear has spur teeth whose tooth traces are parallel to the central axis and has a plurality of second tooth portions disposed between adjacent first tooth portions, Relatively moving at least one of the transmission unit and the transmission so as to move away from each other in an axial direction in which the central shaft extends, thereby releasing the meshing between the first gear and the second gear; performing maintenance on at least one of the transmission unit and the transmission; and moving at least one of the transmission unit and the transmission relatively so as to approach each other in the axial direction, thereby meshing the first gear with the second gear.

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