Coupling equipment and rotating machinery equipment

Abstract

In this rotary body, a hole that is opened in a surface of the rotary body is formed. If noise ascribable to the hole is generated when the rotary body is rotated, the depth of the hole or the inner diameter of the hole is changed so that an acoustic natural frequency determined by the inner diameter of the hole and the depth of the hole is offset from a vortex shedding frequency determined by the circumferential speed of the hole opening at a predetermined number of revolutions.

Description

[Technical field]

[0001] The present disclosure relates to For coupling equipment and rotating machinery equipment Regarding. This application claims priority based on Patent Application No. 2021-204323, filed in Japan on December 16, 2021, the contents of which are incorporated herein by reference. [Background technology]

[0002] A rotating body that rotates around an axis may have a hole formed in the surface of the rotating body. In such a rotating body, noise caused by the hole may be generated as the rotating body rotates.

[0003] The following Patent Document 1 discloses a lock nut as an example of a rotating body that rotates around an axis. This lock nut is formed with a rotation balance adjustment hole recessed from its surface in the axial direction. The opening of this rotation balance adjustment hole is blocked by a threaded plug that is screwed into the adjustment hole. Therefore, with the technology described in Patent Document 1, noise caused by the rotation balance adjustment hole can be suppressed even when the lock nut rotates. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2009-281426 A Summary of the Invention [Problem to be solved by the invention]

[0005] Among the holes formed in the rotor, there are holes that are not used permanently or for a long period of time, and there are holes that are used frequently. For holes that are not used permanently or for a long period of time, it is effective to block the opening of the hole with a plug or the like, as in the technology described in the above Patent Document 1, in order to suppress noise caused by the hole. On the other hand, for holes that are used frequently, if the opening of the hole is blocked with a plug or the like, as in the technology described in the above Patent Document 1, it becomes troublesome to remove the plug or the like every time the hole is used. In addition, when the hole is recessed from the outer peripheral surface of the rotor in the radial direction relative to the axis, there is a risk that the plug or the like blocking the opening of the hole will come off the rotor due to the centrifugal force generated by the rotation of the rotor.

[0006] Therefore, an object of the present disclosure is to provide a technology that can reduce the effort required to use a hole while suppressing noise caused by the hole. [Means for solving the problem]

[0011] One embodiment of a coupling facility for achieving the above object comprises: cup A ring device and a coupling device are fixed to an apparatus installation surface above which the coupling device is disposed, and the coupling device is separated from the apparatus. It covers the front, back, left, right and top of the A coupling soundproof room is also provided. The coupling device includes a spacer rotatable around an axis at a predetermined rotational speed, a first coupling flange rotatable around the axis at the predetermined rotational speed and disposed on a first axis side, which is one side in the axial direction in which the axis extends with respect to the spacer, a second coupling flange rotatable around the axis at the predetermined rotational speed and disposed on a second axis side, which is the other side in the axial direction with respect to the spacer, and a connector that connects the first coupling flange, the spacer, and the second coupling flange to each other so that the first coupling flange, the spacer, and the second coupling flange can rotate together. The spacer has a hole that opens on a surface of the spacer. An acoustic natural frequency determined by the inner diameter and depth of the hole is shifted from a vortex generation frequency determined by the peripheral speed of the opening of the hole at the predetermined rotational speed.

[0012] In this embodiment, the coupling soundproof room can suppress sound leaking outside the coupling soundproof room.

[0013] One aspect of a rotating machinery facility for achieving the above object is to mosquito A coupling device, place The rotary machine includes a rotor that can rotate at a constant rotation speed and a casing that covers a portion of the rotor, and an enclosure that covers at least the casing of the rotary machine. The coupling device includes a spacer rotatable around an axis at the predetermined rotational speed, a first coupling flange rotatable around the axis at the predetermined rotational speed and disposed on a first axial side that is one side in the axial direction in which the axis extends with reference to the spacer, a second coupling flange rotatable around the axis at the predetermined rotational speed and disposed on a second axial side that is the other side in the axial direction with reference to the spacer, and a connector that connects the first coupling flange, the spacer, and the second coupling flange to each other so that the first coupling flange, the spacer, and the second coupling flange can rotate together. The spacer has a hole that opens on a surface of the spacer. An acoustic natural frequency determined by the inner diameter and depth of the hole is shifted from a vortex generation frequency determined by the peripheral speed of the opening of the hole at the predetermined rotational speed.The rotor has a rotor shaft extending in the axial direction centered on the axis, a functional member fixed to an outer periphery of the rotor shaft and rotating integrally with the rotor shaft to perform a function required of the rotating machine, and the first coupling flange fixed to an end of the rotor shaft in the axial direction. The casing covers the functional member without covering the first coupling flange. The axis extends in a direction including a horizontal direction. The enclosure has an upper coupling soundproof wall spaced upward from the coupling device, and a pair of side coupling soundproof walls spaced from the coupling device in a lateral direction perpendicular to the axis. One of the pair of side coupling soundproof walls, a first side coupling soundproof wall, is disposed on a first side direction side with respect to the coupling device among both sides in the lateral direction. The other of the pair of side coupling soundproof walls, a second side coupling soundproof wall, is disposed on a second side direction side with respect to the coupling device among both sides in the lateral direction. The upper coupling soundproof wall and the pair of side coupling soundproof walls are connected to each other. The upper coupling soundproof wall and the pair of side coupling soundproof walls have sound absorbing materials.

[0014] In this aspect, since the coupling device is covered by the enclosure of the rotating machine, noise leaking to the outside from the coupling device can be suppressed. Effect of the Invention

[0019] In one aspect of the present disclosure, it is possible to reduce the effort required to use the holes while suppressing noise caused by the holes when the rotating body is rotated. [Brief description of the drawings]

[0020] [Figure 1] FIG. 2 is a cross-sectional view of a coupling device before modification in one embodiment according to the present disclosure. [Diagram 2] 4 is a flowchart showing the steps of a noise prevention method according to an embodiment of the present disclosure. [Diagram 3]FIG. 2 is an explanatory diagram illustrating a mechanism for generating self-excited noise and a method for suppressing the self-excited noise in one embodiment of the present disclosure. [Figure 4] FIG. 13 is a cross-sectional view of a modified coupling device in one embodiment according to the present disclosure. [Diagram 5] 1 is a flowchart showing a procedure for manufacturing a rotating body according to an embodiment of the present disclosure. [Figure 6] 1 is a conceptual diagram illustrating a configuration of a rotating machinery facility according to an embodiment of the present disclosure. [Figure 7] FIG. 2 is a perspective view of a rear portion of an enclosure and a generator in one embodiment according to the present disclosure. [Figure 8] FIG. 2 is a plan view of the rear of the enclosure and generator in one embodiment according to the present disclosure. [Figure 9] 9 is a cross-sectional view taken along line IX-IX in FIG. 8. [Figure 10] 10 is a cross-sectional view taken along line XX in FIG. [Figure 11] FIG. 2 is a cross-sectional view of a main portion of a coupling cover in one embodiment according to the present disclosure. [Figure 12] 13 is a cross-sectional view of a main portion of a coupling cover in a modified example of an embodiment according to the present disclosure. FIG. [Figure 13] FIG. 1 is a cross-sectional view of a coupling arrangement in one embodiment according to the present disclosure. [Figure 14] 14 is a cross-sectional view taken along line XIV-XIV in FIG. 13. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, various embodiments and modifications according to the present disclosure will be described with reference to the drawings.

[0022] "Embodiments of Coupling Device" An embodiment of a coupling device including a rotating body according to the present disclosure will be described with reference to FIGS. 1 to 5. FIG.

[0023] As shown in Fig. 1, the coupling device 10 of this embodiment includes a first coupling flange 20, a second coupling flange 30, a spacer 40 disposed between the first coupling flange 20 and the second coupling flange 30, and a plurality of connectors 11 connecting these to each other so that they can rotate together. Note that the coupling device 10 shown in Fig. 1 is a coupling device before a noise prevention method described later is performed.

[0024] The connector 11 in this embodiment has a bolt 12 and a nut 13 .

[0025] The first coupling flange 20, the second coupling flange 30, and the spacer 40 are all disk-shaped. In a state where the first coupling flange 20, the second coupling flange 30, and the spacer 40 are connected to each other by a plurality of connectors 11, the central axis of the disk-shaped first coupling flange 20, the central axis of the disk-shaped second coupling flange 30, and the central axis of the disk-shaped spacer 40 are located on the same axis Ar. In this state, the first coupling flange 20, the second coupling flange 30, and the spacer 40 can rotate around the axis Ar at a predetermined rotation speed. The predetermined rotation speed is, for example, a predetermined rated rotation speed. Here, the direction in which the axis Ar extends is the axial direction Da, the radial direction relative to the axis Ar is the radial direction Dr, and the circumferential direction relative to the axis Ar is the circumferential direction Dc. In addition, in the axial direction Da, the side on which the first coupling flange 20 is located with respect to the spacer 40 is referred to as the first axial side Da1, and the side on which the second coupling flange 30 is located with respect to the spacer 40 is referred to as the second axial side Da2.

[0026] The connector 11 in this embodiment has a bolt 12 and a nut 13 .

[0027] The disk-shaped first coupling flange 20 has an outer peripheral surface 21, a contact surface 22, a non-contact surface 23, a plurality of bolt holes 24, a plurality of jack holes 25, and one or more balance holes 26. The outer peripheral surface 21 is an outer peripheral surface of a disk centered on the axis Ar. The contact surface 22 is a surface that spreads from the axis Ar in the radial direction Dr, connects to the edge of the second axial side Da2 of the outer peripheral surface 21, and faces the second axial side Da2. The non-contact surface 23 is a surface that spreads from the axis Ar in the radial direction Dr, connects to the edge of the first axial side Da1 of the outer peripheral surface 21, and faces the first axial side Da1. The plurality of bolt holes 24 are arranged in the circumferential direction Dc centered on the axis Ar. The bolt hole 24 is a hole that penetrates from the non-contact surface 23 to the contact surface 22. The inner diameter of this bolt hole 24 is a dimension that allows the bolt 12 of the connector 11 to be inserted. The multiple jack holes 25 are arranged in the circumferential direction Dc around the axis Ar. The jack holes 25 are holes that penetrate from the non-contact surface 23 to the contact surface 22. A female thread 25s is formed in the inner peripheral surface of the jack hole 25 on the second axis side Da2. One or more balance holes 26 are holes that penetrate from the non-contact surface 23 to the contact surface 22. When the first coupling flange 20, the second coupling flange 30, and the spacer 40 are connected to each other, the edges of the jack holes 25 and the balance holes 26 and the non-contact surface 23 become the openings 25o and 26o of these holes 25 and 26.

[0028] The outer diameter of the disk-shaped second coupling flange 30 is the same as the outer diameter of the disk-shaped first coupling flange 20. The second coupling flange 30 has an outer peripheral surface 31, a contact surface 32, a non-contact surface 33, a plurality of bolt holes 34, and a plurality of jack holes 35. The outer peripheral surface 31 is an outer peripheral surface of a disk centered on the axis Ar. The contact surface 32 is a surface that spreads from the axis Ar in the radial direction Dr, connects to the edge of the axial first side Da1 of the outer peripheral surface 31, and faces the axial first side Da1. The non-contact surface 33 is a surface that spreads from the axis Ar in the radial direction Dr, connects to the edge of the axial second side Da2 of the outer peripheral surface 31, and faces the axial second side Da2. The plurality of bolt holes 34 are arranged in the circumferential direction Dc centered on the axis Ar. The bolt holes 34 are holes that penetrate from the non-contact surface 33 to the contact surface 32. The inner diameter of the bolt hole 34 is a dimension through which the bolt 12 of the connector 11 can be inserted, and is the same as the inner diameter of the bolt hole 24 of the first coupling flange 20. The multiple jack holes 35 are arranged in the circumferential direction Dc around the axis Ar. The jack hole 35 is a hole that penetrates from the non-contact surface 33 to the contact surface 32. A female thread 35s is formed in the inner peripheral surface of the jack hole 35 on the first axis side Da1. One or more balance holes 36 are holes that penetrate from the non-contact surface 33 to the contact surface 32. When the first coupling flange 20, the second coupling flange 30, and the spacer 40 are connected to each other, the edges of the jack hole 35 and the balance hole 36 and the non-contact surface 33 become the openings 35o and 36o of these holes 35 and 36.

[0029] The outer diameter of the disk-shaped spacer 40 is slightly larger than the outer diameter of the first coupling flange 20 and the outer diameter of the second coupling flange 30. The spacer 40 has an outer peripheral surface 41, a first contact surface 42, a second contact surface 43, a plurality of bolt holes 44, and a lifting hole 46. The outer peripheral surface 41 is the outer peripheral surface of a disk centered on the axis Ar. The first contact surface 42 is a surface that spreads from the axis Ar in the radial direction Dr, connects to the edge of the axial first side Da1 of the outer peripheral surface 41, and faces the axial first side Da1. In a state in which the first coupling flange 20, the second coupling flange 30, and the spacer 40 are connected to each other, the first contact surface 42 is in contact with the contact surface 22 of the first coupling flange 20. The second contact surface 43 is a surface that spreads from the axis Ar in the radial direction Dr, connects to the edge of the axial second side Da2 of the outer peripheral surface 41, and faces the axial second side Da2. When the first coupling flange 20, the second coupling flange 30, and the spacer 40 are connected to each other, the second contact surface 43 is in contact with the contact surface 32 of the second coupling flange 30. The bolt holes 44 are arranged in a circumferential direction Dc around the axis Ar. The bolt holes 44 are holes that penetrate from the first contact surface 42 to the second contact surface 43. The inner diameter of the bolt holes 44 is a dimension that allows the bolts 12 of the connector 11 to be inserted therethrough. The lifting holes 46 are holes recessed in the radial direction Dr from the outer circumferential surface 41. The edge between the lifting holes 46 and the outer circumferential surface 41 is the opening 46o of the lifting holes 46. A female thread is formed on the inner circumferential surface of the lifting holes 46.

[0030] The jack hole 25 of the first coupling flange 20 and the jack hole 35 of the second coupling flange 30 are holes into which a jack bolt 51 can be inserted. A male thread is formed at the tip of the jack bolt 51, which can be screwed into the female threads 25s, 35s formed on the inner circumferential surfaces of the jack holes 25, 35. These jack holes 25, 35 are used when disassembling the coupling device 10. Specifically, when disassembling the coupling device 10, the jack bolt 51 is inserted into the jack hole 25, 35, and the male thread of the jack bolt 51 is screwed into the female threads 25s, 35s of the jack hole 25, 35 so that the tip of the jack bolt 51 protrudes from the contact surface 22, 32. As a result, the spacer 40 attached to the contact surface 22, 32 of each coupling flange 20, 30 is removed.

[0031] The balance hole 26 of the first coupling flange 20 is a hole for achieving rotational balance of the rotating parts including this first coupling flange 20. In addition, the balance hole 36 of the second coupling flange 30 is also a hole for achieving rotational balance of the rotating parts including this second coupling flange 30.

[0032] The lifting hole 46 of the spacer 40 is a hole into which the tip of the eye bolt 54 can be screwed. This lifting hole 46 is used when assembling or disassembling the coupling device 10. Specifically, when assembling or disassembling the coupling device 10, the tip of the eye bolt 54 is screwed into the lifting hole 46, and the spacer 40 is hung at a predetermined position via this eye bolt 54. As a result, when assembling or disassembling the coupling device 10, the position of the spacer 40 can be stabilized and the spacer 40 can be prevented from falling.

[0033] The rotating body according to the present invention is the spacer 40 among the components of the coupling device 10 described above. The first coupling flange 20 and the second coupling flange 30 are also a type of rotating body.

[0034] Next, a method for preventing noise from being generated by the coupling device 10 described above will be described.

[0035] As shown in the flow chart of FIG. 2, first, the coupling device 10 is rotated at a predetermined rotation speed around the axis Ar, and it is determined whether or not noise is generated at the predetermined rotation speed (determination step S1). In this determination step S1, it is determined whether or not self-excited noise caused by holes formed in the coupling device 10 is generated when the coupling device 10 is rotated at the predetermined rotation speed. Here, for example, in the process of increasing the rotation speed of the coupling device 10, when the rotation speed of the coupling device 10 approaches the predetermined rotation speed, if the sound from the coupling device 10 suddenly becomes louder, it is determined that self-excited noise is generated. Note that self-excited noise will be described in detail later.

[0036] When it is determined in the determination step S1 that noise has occurred, the hole is modified (hole modification step S2). Note that the modification of the hole will be described in detail later. This completes the noise prevention method in this embodiment.

[0037] Next, self-excited noise that occurs when the rotor 1 is rotating will be described with reference to FIG.

[0038] The inventors have noticed that when the rotor 1 rotates, a vortex 6 is generated near the opening 5 of the hole 3, and have found that this vortex 6 generates self-excited noise.

[0039] Here, if the sound speed is C, the depth of the hole 3 is L, and the inner diameter of the hole 3 is D, the acoustic natural frequency fa of the hole 3 can be expressed by the following equation. fa = (C / 4) / (L+0.85×D / 2)

[0040] Furthermore, if the peripheral speed of the opening 5 of the hole 3 when the rotor 1 is rotating at a predetermined rotation speed is U and the Strouhal number is St, the vortex generation frequency Fk can be expressed by the following equation. Fk = St × (U / D) The peripheral speed U of the opening 5 of the hole 3 is determined by the distance from the axis Ar to the opening 5 of the hole 3 (the rotation radius of the opening 5) and the rotation speed of the rotor 1.

[0041] In addition, the dimensionless flow velocity Vr is calculated from the above-mentioned acoustic natural frequency fa, the peripheral speed U of the opening 5 of the hole 3, and the inner diameter D of the hole 3 using the following formula. Vr = 1 / fa × U / D

[0042] Whether or not there is a possibility of self-excited noise due to a hole occurring is determined based on the relationship between the acoustic natural frequency fa and the vortex shedding frequency Fk, and whether or not the dimensionless flow velocity Vr is within a predetermined range. In view of the relationship between the acoustic natural frequency fa and the vortex shedding frequency Fk, self-excited noise occurs when the acoustic natural frequency fa coincides with the vortex shedding frequency Fk or is close to the vortex shedding frequency Fk. Therefore, it is preferable that the acoustic natural frequency fa is somewhat distant from the vortex shedding frequency Fk.

[0043] Therefore, in order to suppress the self-excited noise, in the hole modification process S2, the hole 3 is modified so that the acoustic natural frequency fa is somewhat separated from the vortex generation frequency Fk. Specifically, the inner diameter Dx of the hole 3b after modification is made larger than the inner diameter D of the hole 3 before modification so that the acoustic natural frequency fa is somewhat separated from the vortex generation frequency Fk. Alternatively, the depth Lx of the hole 3a after modification is made deeper than the depth L of the hole before modification so that the acoustic natural frequency fa is somewhat separated from the vortex generation frequency Fk. Furthermore, the corner between the surface 2 of the rotor 1 and the inner circumferential surface 4 of the hole 3 before modification is chamfered. As a result, the inner circumferential surface of the hole 3a after modification is formed with a first inner circumferential surface 4a which is a part of the inner circumferential surface 4 before modification, and a second inner circumferential surface 4b which connects the end of the first inner circumferential surface 4a and the surface 2 of the rotor 1. The inner diameter of the second inner circumferential surface 4b gradually increases from the connection position with the first inner circumferential surface 4a toward the connection position with the surface 2 (the opening 5a after modification). By chamfering the corner between the surface 2 of the rotor 1 and the inner circumferential surface 4 of the hole 3 in this manner, the power of the vortex generated due to the hole 3 can be reduced.

[0044] In the hole modifying step S2 of this embodiment, the following modifications are made to the hole based on the above.

[0045] The coupling device 10 of this embodiment has multiple types of holes that open on the surface. Therefore, in the judgment step S1 described above, it is unclear which hole is generating the self-excited noise. Therefore, the following modifications are made to the multiple types of holes in the coupling device 10 of this embodiment.

[0046] As for the lifting hole 46 of the spacer 40, as described above with reference to Fig. 3, the inner diameter D of the lifting hole 46 before modification is increased so that the acoustic natural frequency fa is somewhat separated from the vortex generation frequency Fk. Alternatively, the depth L of the lifting hole 46 before modification is increased so that the acoustic natural frequency fa is somewhat separated from the vortex generation frequency Fk. Here, as shown in Figs. 1 and 4, the depth Lx of the lifting hole 46a after modification is made deeper than the depth L of the lifting hole 46 before modification. As a result, the self-excited noise caused by the lifting hole 46 can be suppressed.

[0047] Furthermore, as shown in FIG. 4, the corner between the inner peripheral surface 47 of the lifting hole 46 before modification and the outer peripheral surface 41 of the spacer 40 is ground and chamfered. As a result, the inner peripheral surface of the lifting hole 46a after modification is formed with a first inner peripheral surface 47a which is a part of the inner peripheral surface 47 before modification, and a second inner peripheral surface 47b which connects the end of the first inner peripheral surface 47a and the outer peripheral surface 41 of the spacer 40. The inner diameter of the second inner peripheral surface 47b gradually increases from the connection position with the first inner peripheral surface 47a toward the connection position with the outer peripheral surface 41 (the opening 46oa after modification). As a result, the power of the vortex generated due to the lifting hole 46 can be reduced.

[0048] As shown in FIG. 4, after the modification of each hole, the openings 25o, 26o, 35o, 36o of the jack hole 25 and the balance hole 26 of the first coupling flange 20 and the jack hole 35 and the balance hole 36 of the second coupling flange 30 are closed with a lid. This lid is detachable from the modified holes 25a, 26a, 35a, 36a. For this reason, the threaded plugs 52 and 53 having male threads formed on the outer periphery are used as the lids. Therefore, the modified holes 25a, 26a, 35a, 36a to which the threaded plugs 52 and 53 are attached have female threads 25sa, 26s, 35sa, 36s into which the male threads of the threaded plugs 52 and 53 can be screwed.

[0049] By modifying each hole of the coupling device 10 as described above, the noise of the modified coupling device 10a can be suppressed.

[0050] Incidentally, the lifting hole 46a of the spacer 40 is a hole used every time an equipment including the coupling device 10a is inspected. For this reason, if the opening 46oa of the lifting hole 46a is blocked with a threaded plug or the like, the work of removing and attaching the threaded plug occurs every time the lifting hole 46a is used, that is, every time an equipment including the coupling device 10a is inspected. In addition, since the lifting hole 46a is a hole that opens on the outer peripheral surface 41 of the spacer 40, if the opening 46oa of the lifting hole 46a is blocked with a threaded plug or the like, there is a risk that the threaded plug or the like will come off the spacer 40 due to the centrifugal force generated by the rotation of the coupling device 10a. Therefore, in this embodiment, in order to suppress the noise caused by the lifting hole 46 before the modification and to reduce the effort required when using the lifting hole 46, the depth of the lifting hole 46a after the modification is made deeper. Or, the inner diameter of the lifting hole 46a after the modification is made larger. In addition, the depth of the modified lifting hole 46a may be made shallower or the inner diameter of the modified lifting hole 46a may be made smaller so that the acoustic natural frequency fa is somewhat separated from the vortex generation frequency Fk.

[0051] On the other hand, the balance holes 26a, 36a are holes that are not permanently used. Therefore, even if the openings 26o, 36o of the balance holes 26a, 36a are blocked with the threaded plugs 53, it is not necessary to remove the threaded plugs 53 every time an inspection of the equipment including the coupling device 10a is performed. Moreover, since the openings 26o, 36o of the balance holes 26a, 36a are formed on the non-contact surfaces 23, 33, the centrifugal force acting on the threaded plugs 53 acts in a direction perpendicular to the direction in which the threaded plugs 53 are removed from the balance holes 26a, 36a, and the threaded plugs 53 are less likely to be removed from the coupling flanges 20, 30. Therefore, in this embodiment, the openings 26o, 36o of the balance holes 26a, 36a are blocked with the threaded plugs 53.

[0052] Furthermore, even if the openings 25o, 35o of the jack holes 25a, 35a are blocked with the threaded plugs 52, the centrifugal force acting on the threaded plugs 52 acts in a direction perpendicular to the direction in which the threaded plugs 52 are removed from the jack holes 25a, 35a, so that the threaded plugs 52 are less likely to come off the coupling flanges 20, 30. Therefore, in this embodiment, the openings 25o, 35o of the jack holes 25a, 35a are blocked with the threaded plugs 52.

[0053] The above describes a method for preventing noise caused by holes by modifying various holes in the coupling device 10. However, depending on the manufacturing method of the coupling device, it is also possible to suppress noise caused by holes without modifying the holes.

[0054] Next, a method for manufacturing a coupling device including a rotor will be described with reference to the flowchart shown in FIG.

[0055] First, a coupling device including a rotating body is designed (design process S10). In this design process S10, for example, the coupling device 10 described with reference to FIG. 1 is designed. Therefore, this coupling device 10 is a device before the holes are modified by the noise prevention method described above. At the end of this design process S10, the balance holes 26, 36 have not been designed basically.

[0056] Next, it is determined whether or not there is a possibility that noise caused by the hole will occur when the coupling device 10 is rotated at a predetermined rotation speed (determination step S11). In particular, in this determination step S11, it is determined whether or not there is a possibility that self-excited noise caused by the hole will occur when the coupling device 10 is rotated at a predetermined rotation speed.

[0057] Whether or not there is a possibility of self-excited noise occurring due to a hole is determined depending on whether or not the acoustic natural frequency fa of the hole designed in the design process S10 deviates from the vortex generation frequency Fk when the rotor is rotating at a predetermined rotation speed, as described above. In addition, it is determined that there is a possibility of self-excited noise occurring when the above-mentioned dimensionless flow velocity Vt is, for example, not less than 2.7 and not more than 5.5, and it is determined that there is a low possibility of self-excited noise occurring when the dimensionless flow velocity Vt is less than 2.7 or more than 5.5.

[0058] If it is determined in the determination step S11 that there is a possibility of noise generation, the coupling device 10 is redesigned (redesign step S12). In this redesign step S12, the redesign is performed as follows.

[0059] With regard to the lifting hole 46 of the spacer 40, the inner diameter Dx of the lifting hole 46a after the redesign process S12 is increased so that the dimensionless flow velocity Vt is less than 2.7 or greater than 5.5, relative to the inner diameter D of the lifting hole 46 before the redesign process S12. Alternatively, the depth Lx of the lifting hole 46a after the redesign process S12 is increased so that the dimensionless flow velocity Vt is less than 2.7 or greater than 5.5, relative to the depth L of the lifting hole 46 before the redesign process S12.

[0060] The jack holes 25 of the first coupling flange 20 and the jack holes 35 of the second coupling flange 30 are redesigned so that the openings 25o, 35o of the jack holes 25, 35 before the redesign process S12 can be closed with threaded plugs 52 that are detachable from the jack holes 25, 35. In other words, female threads 25sa, 35sa are provided on the inner peripheral surfaces of the jack holes 25a, 35a after the redesign.

[0061] The balance hole 26 of the first coupling flange 20 and the balance hole 36 of the second coupling flange 30 are not basically designed even at the end stage of this redesign process S12. However, in this redesign process S12, if these balance holes 26, 36 are provided, it is clearly indicated in the redesign drawing that the openings 26o, 36o of these balance holes 26, 36 can be closed with a screw plug 53 that is detachable from the balance holes 26, 36.

[0062] Next, the coupling device 10a redesigned in the redesign process S12 is manufactured (manufacturing process S13). In this manufacturing process S13, for example, the coupling device 10a described with reference to FIG.

[0063] The coupling device 10a manufactured as described above has the same structure as the coupling device 10a after the hole has been modified by the noise prevention method described above. Therefore, the coupling device 10a manufactured as described above can suppress the noise of the coupling device 10a including the rotating body (spacer 40) in the same way as the coupling device 10a after the hole has been modified by the noise prevention method described above.

[0064] "Embodiment of Rotating Machinery Equipment" An embodiment of a rotating machinery installation according to the present disclosure will be described with reference to FIGS.

[0065] As shown in FIG. 6, the rotary machinery equipment of this embodiment includes a steam turbine 60 as a rotary machine, an enclosure 70 that covers the steam turbine 60, a generator 80 capable of generating electricity by the rotation of the steam turbine 60, and a coupling device 10b.

[0066] A steam turbine 60 as a rotary machine has a turbine rotor 61 rotatable about an axis Ar, a turbine casing 65 covering a portion of the turbine rotor 61, and a first bearing device 67a and a second bearing device 67b rotatably supporting the turbine rotor 61. Here, the direction in which the axis Ar extends is defined as the axial direction Da, the radial direction Dr relative to the axis Ar is defined as the radial direction Dr, and the circumferential direction Dc relative to the axis Ar is defined as the circumferential direction Dc.

[0067] The turbine rotor 61 has a turbine rotor shaft 62 extending in an axial direction Da centered on the axis Ar, a plurality of moving blades 63 provided on the outer periphery of the turbine rotor shaft 62, and a coupling flange 64 provided at an end of the turbine rotor shaft 62 on a second axial side Da2 in the axial direction Da. A turbine casing 65 covers a portion of the turbine rotor 61 where the plurality of moving blades 63 are provided. The plurality of moving blades 63 receive force from steam ST that has flowed into the turbine casing 65, and rotate the turbine rotor shaft 62 on which the plurality of moving blades 63 are provided. Thus, the plurality of moving blades 63 are functional members that rotate integrally with the turbine rotor shaft 62 to exhibit functions required of the steam turbine 60.

[0068] The first bearing device 67a rotatably supports a portion of the turbine rotor 61 on a first axial side Da1 in the axial direction Da. The second bearing device 67b rotatably supports a portion of the turbine rotor 61 on a second axial side Da2 of the multiple rotor blades 63 and on the first axial side Da1 of the coupling flange 64. Both the first bearing device 67a and the second bearing device 67b have a bearing 68 and a bearing casing 69 that covers the bearing 68.

[0069] The generator 80 as a rotating machine is disposed on the second axial side Da2 in the axial direction Da with respect to the steam turbine 60. The generator 80 has a generator rotor 81 that can rotate about the axis Ar, a generator casing 85 that covers a portion of the generator rotor 81, and a coil 86 attached to the inner surface of the generator casing 85.

[0070] The generator rotor 81 has a generator rotor shaft 82 extending in the axial direction Da centered on the axis Ar, a magnet 83 fixed to the outer periphery of the generator rotor shaft 82, and a coupling flange 84 provided at the end of the generator rotor shaft 82 on the first axial side Da1 in the axial direction Da. A coil 86 provided in the generator casing 85 and the magnet 83 provided on the generator rotor shaft 82 face each other in the radial direction Dr. The magnet 83 rotates integrally with the generator rotor shaft 82 to generate electric power in the coil 86 provided on the generator casing 85. Thus, the magnet 83 is a functional member that exhibits the function required of the generator 80 by rotating integrally with the generator rotor shaft 82. The generator casing 85 covers the portion of the generator rotor 81 where the magnet 83 is provided.

[0071] The coupling device 10b of this embodiment has the modified coupling device 10a described above. That is, the coupling device 10b of this embodiment includes a first coupling flange 20, a second coupling flange 30, a spacer 40, and a plurality of connectors 11, as described with reference to FIG. 4. Here, the first coupling flange 20 is the coupling flange 64 of the steam turbine 60. Also, the second coupling flange 30 is the coupling flange 84 of the generator 80.

[0072] As described above, the coupling device 10b of the present embodiment has the modified first coupling flange 20, the modified second coupling flange 30, and the modified spacer 40 shown in FIG. 4, and therefore can suppress noise associated with the rotation of these components.

[0073] In addition to functioning as the bearing 68, the second bearing device 67b may also function as a clutch. In this case, the rotor protruding from the second bearing device 67b to the axial first side Da1 is a separate member from the rotor protruding from the second bearing device 67b to the axial second side Da2. However, in this embodiment, even in such a case, the entire rotor present on the axial first side Da1 is treated as the turbine rotor 61 based on the spacer 40 of the coupling device 10b present on the axial second side Da2 relative to the second bearing device 67b.

[0074] The coupling device 10b of this embodiment further includes a coupling cover 90 that covers the outer periphery of the first coupling flange 20, the second coupling flange 30, and the spacer 40. The coupling cover 90 is annular so as to cover the outer periphery of the first coupling flange 20, the outer periphery of the spacer 40, and the outer periphery of the second coupling flange 30, and is spaced apart from the first coupling flange 20, the spacer 40, and the second coupling flange 30 in the radial direction Dr relative to the axis Ar.

[0075] 11, the coupling cover 90 has a support material 91 that is annular about the axis Ar, and a sound absorbing section 92 that is disposed on the outer periphery of the support material 91 and supported by the support material 91. The annular support material 91 has a plurality of through holes that penetrate from the inner periphery to the outer periphery. The support material 91 is, for example, an expanded metal or a punched metal.

[0076] The sound absorbing part 92 of the coupling cover 90 has a plurality of sound absorbing materials 93 arranged in a radial direction Dr relative to the axis Ar, and a sound insulation plate 94 arranged between the plurality of sound absorbing materials 93. The plurality of sound absorbing materials 93 are all annular with the axis Ar as the center. In this embodiment, the plurality of sound absorbing materials 93 include a first sound absorbing material 93a, a second sound absorbing material 93b, a third sound absorbing material 93c, a fourth sound absorbing material 93d, and a fifth sound absorbing material 93e. Of the plurality of sound absorbing materials 93, the first sound absorbing material 93a is arranged on the innermost side. The first sound absorbing material 93a is in contact with the support material 91 and is supported by the support material 91. The second sound absorbing material 93b is arranged on the outer periphery side of the first sound absorbing material 93a. The third sound absorbing material 93c is arranged on the outer periphery side of the second sound absorbing material 93b. The fourth sound absorbing material 93d is arranged on the outer periphery side of the third sound absorbing material 93c. The fifth sound absorbing material 93e is disposed on the outer circumferential side of the fourth sound absorbing material 93d. The first sound absorbing material 93a and the fifth sound absorbing material 93e are formed of, for example, glass cloth. The second sound absorbing material 93b, the third sound absorbing material 93c, and the fourth sound absorbing material 93d are formed of, for example, rock wool. The sound absorbing section 92 may further include a sound insulating plate 94 disposed between the sound absorbing material 93 disposed on the innermost side in the radial direction Dr among the plurality of sound absorbing materials 93 and the support material 91.

[0077] The sound-proofing plate 94 is disposed between the second sound-absorbing material 93b and the third sound-absorbing material 93c, and between the third sound-absorbing material 93c and the fourth sound-absorbing material 93d. The sound-proofing plate 94 is formed of, for example, an iron plate.

[0078] As described above, the coupling device 10b of this embodiment has the coupling cover 90 including the multiple sound absorbing materials 93, and therefore, it is possible to suppress sound leaking out of the coupling device 10b.

[0079] Also, as shown in FIG. 12, the coupling cover 90 may further have an inner sound absorbing material 95. This inner sound absorbing material 95 is disposed between the support material 91 and the sound absorbing portion 92 in the radial direction Dr. This inner sound absorbing material 95 is formed of, for example, glass cloth. Note that this inner sound absorbing material 95 may be formed of rock wool. In this way, by disposing the inner sound absorbing material 95 between the support material 91 and the sound absorbing portion 92, this inner sound absorbing material 95 can absorb a part of the sound from the noise source before the sound from the noise source reaches the innermost sound insulation plate 94. Therefore, by disposing the inner sound absorbing material 95, it is possible to effectively suppress the sound leaking out of the coupling device 10b.

[0080] As shown in Figs. 6 and 7, the enclosure 70 has a front sound-proof wall 71 disposed on the axial first side Da1 of the steam turbine 60, a pair of rear sound-proof walls 73 disposed on the axial second side Da2 of the steam turbine 60, a pair of side sound-proof walls 72 disposed in the side direction Ds of the steam turbine 60, and an upper sound-proof wall 74. The pair of rear sound-proof walls 73 are located at the same positions in the axial direction Da, and are all sound-proof walls facing the axial direction Da. The second rear sound-proof wall 73b of the pair of rear sound-proof walls 73 is disposed at a position away from the first rear sound-proof wall 73a of the pair of rear sound-proof walls 73 in the second side direction Ds2. The pair of side sound-proof walls 72 are all sound-proof walls facing the side direction Ds. The first side sound-proof wall 72a of the pair of side sound-proof walls 72 is disposed on the side of the first side direction Ds1 of the steam turbine 60. The second side sound-proof wall 72b of the pair of side sound-proof walls 72 is disposed on the second side direction Ds2 side of the steam turbine 60. An end of the first side direction Ds1 of the front sound-proof wall 71 is connected to an end of the axial first side Da1 of the first side sound-proof wall 72a. An end of the second side direction Ds2 of the front sound-proof wall 71 is connected to an end of the axial first side Da1 of the second side sound-proof wall 72b. An end of the first side direction Ds1 of the first rear sound-proof wall 73a is connected to an end of the axial second side Da2 of the first side sound-proof wall 72a. An end of the second side direction Ds2 of the second rear sound-proof wall 73b is connected to an end of the axial second side Da2 of the second side sound-proof wall 72b. The upper end of the front soundproof wall 71, the upper end of the first rear soundproof wall 73a, the upper end of the second rear soundproof wall 73b, the upper end of the first side soundproof wall 72a, and the upper end of the second side soundproof wall 72b are all connected to the upper soundproof wall 74.

[0081] As shown in Fig. 7 to Fig. 10, the enclosure 70 further includes a post-shift soundproof wall 75, a pair of retracted side soundproof walls 76, a pair of side coupling soundproof walls 77, and an upper coupling soundproof wall 78. Fig. 8 is a plan view of the rear of the enclosure 70 and the generator 80. Fig. 9 is a cross-sectional view taken along line IX-IX in Fig. 8. Fig. 10 is a cross-sectional view taken along line XX in Fig. 9.

[0082] The pair of side coupling soundproof walls 77 are all soundproof walls facing the side direction Ds. The first side coupling soundproof wall 77a of the pair of side coupling soundproof walls 77 is disposed on the side of the first side direction Ds1 of the coupling device 10b. The second side coupling soundproof wall 77b of the pair of side coupling soundproof walls 77 is disposed on the second side direction Ds2 of the coupling device 10b. The first side coupling soundproof wall 77a and the second side coupling soundproof wall 77b face each other in the side direction Ds. An end of the first side coupling soundproof wall 77a on the second axial side Da2 is connected to the lower side of the first rear soundproof wall 73a and the end in the second axial direction Ds2. An end of the second side coupling soundproof wall 77b on the second axial side Da2 is connected to the lower side of the second rear soundproof wall 73b and the end in the first axial direction Ds1.

[0083] The pair of retractable side soundproof walls 76 are both soundproof walls facing the side direction Ds. The first retractable side soundproof wall 76a of the pair of retractable side soundproof walls 76 is disposed above the first side coupling soundproof wall 77a and on the side of the first side direction Ds1. The second retractable side soundproof wall 76b of the pair of retractable side soundproof walls 76 is disposed above the second side coupling soundproof wall 77b and on the side of the second side direction Ds2. The first retractable side soundproof wall 76a and the second retractable side soundproof wall 76b face each other in the side direction Ds. The distance between the first retractable side soundproof wall 76a and the second retractable side soundproof wall 76b in the side direction Ds is wider than the distance between the first side coupling soundproof wall 77a and the second side coupling soundproof wall 77b in the side direction Ds. An end of the first retracted side soundproof wall 76a on the second axial side Da2 is connected to an end of the first rear soundproof wall 73a in the second lateral direction Ds2. An end of the second retracted side soundproof wall 76b on the second axial side Da2 is connected to an end of the second rear soundproof wall 73b in the first lateral direction Ds1.

[0084] The upper coupling soundproof wall 78 is a soundproof wall facing the up-down direction. This upper coupling soundproof wall 78 is disposed on the upper side of the coupling device 10b. An end of the upper coupling soundproof wall 78 in the first side direction Ds1 is connected to the lower end of the first retraction side soundproof wall 76a. An end of the upper coupling soundproof wall 78 in the second side direction Ds2 is connected to the lower end of the second retraction side soundproof wall 76b. A portion of the upper coupling soundproof wall 78 in the second side direction Ds2 from the first retraction side soundproof wall 76a is connected to the upper end of the first side coupling soundproof wall 77a. A portion of the upper coupling soundproof wall 78 in the first side direction Ds1 from the second retraction side soundproof wall 76b is connected to the upper end of the second side coupling soundproof wall 77b. Among the edges on the second axial side Da2 of the upper coupling soundproof wall 78, an intermediate edge 78m between the first lateral coupling soundproof wall 77a and the second lateral coupling soundproof wall 77b in the lateral direction Ds is shifted toward the first axial side Da1 more than the edge portion in the lateral direction Ds of this intermediate edge 78m.

[0085] The post-shift soundproof wall 75 is a soundproof wall facing the axial direction Da. The post-shift soundproof wall 75 is disposed between the first retraction side soundproof wall 76a and the second retraction side soundproof wall 76b in the lateral direction Ds, on the axial first side Da1 side of the first retraction side soundproof wall 76a, the second retraction side soundproof wall 76b, and the upper coupling soundproof wall 78. Therefore, the post-shift soundproof wall 75 is shifted toward the axial first side Da1 more than the pair of rear soundproof walls 73. An end in the first lateral direction Ds1 of the post-shift soundproof wall 75 is connected to an end on the axial first side Da1 of the first retraction side soundproof wall 76a. An end in the second lateral direction Ds2 of the post-shift soundproof wall 75 is connected to an end on the axial first side Da1 of the second retraction side soundproof wall 76b. The lower end of the post-shift soundproof wall 75 is connected to the end of the upper coupling soundproof wall 78 on the first axial side Da1.

[0086] The upper end of the post-shift soundproof wall 75 and the upper ends of the pair of retractable side soundproof walls 76 are both connected to the upper soundproof wall 74.

[0087] Each of the multiple soundproof walls constituting the enclosure 70 described above has a rigid substrate 79a and a sound absorbing material 79b attached to the substrate 79a.

[0088] An end of the generator casing 85 on the axial first side Da1 is located between the first side coupling sound insulating wall 77a and the second side coupling sound insulating wall 77b in the axial direction Da, on the axial first side Da1 of the first rear sound insulating wall 73a and the second rear sound insulating wall 73b, and on the axial second side Da2 of the middle edge 78m of the upper coupling sound insulating wall 78. Therefore, the end portion of the generator casing 85 on the axial first side Da1 is disposed at a position withdrawn between the first side coupling sound insulating wall 77a and the second side coupling sound insulating wall 77b in the axial direction Da.

[0089] As described above, the coupling device 10b of the present embodiment is surrounded by the pair of side coupling soundproof walls 77 and the upper coupling soundproof wall 78 of the enclosure 70, so that sound leaking to the outside from the coupling device 10b can be suppressed.

[0090] In this embodiment, the coupling device 10b has a coupling cover 90, and the enclosure 70 has a pair of side coupling soundproof walls 77 and an upper coupling soundproof wall 78 that cover the coupling device 10b. However, when the coupling device 10b has the coupling cover 90, the pair of side coupling soundproof walls 77 and the upper coupling soundproof wall 78 of the enclosure 70 may be omitted. Also, when the enclosure 70 has the pair of side coupling soundproof walls 77 and the upper coupling soundproof wall 78, the coupling cover 90 of the coupling device 10b may be omitted.

[0091] "Embodiment of Coupling Equipment" An embodiment of a coupling facility according to the present disclosure will now be described with reference to FIGS.

[0092] The coupling equipment 100 of this embodiment is equipment that is applied when the above-mentioned rotating machinery equipment does not have an enclosure 70 that covers the steam turbine 60. This coupling equipment 100 includes a coupling device 10b, a coupling soundproof room 101 that covers this coupling device 10b, an intake passage frame 111, and an exhaust passage frame 121.

[0093] The coupling device 10b of this embodiment is the same as the coupling device 10b in the rotating machinery equipment described above. Therefore, the coupling device 10b of this embodiment also has a first coupling flange 20, a second coupling flange 30, a spacer 40, and a plurality of connectors 11, as shown in Fig. 4. Furthermore, the coupling device 10b of this embodiment also has a coupling cover 90.

[0094] The coupling soundproof room 101 has a front coupling soundproof wall 102 , a rear coupling soundproof wall 103 , a pair of side coupling soundproof walls 104 , and an upper coupling soundproof wall 105 .

[0095] The front coupling soundproof wall 102 and the rear coupling soundproof wall 103 are both soundproof walls facing the axial direction Da. The front coupling soundproof wall 102 is disposed on the first axial side Da1 of the coupling device 10b and on the second axial side Da2 of the second bearing device 67b. The rear coupling soundproof wall 103 is disposed on the second axial side Da2 of the coupling device 10b and on the first axial side Da1 of the generator casing 85. The front coupling soundproof wall 102 and the rear coupling soundproof wall 103 face each other in the axial direction Da.

[0096] The pair of side coupling soundproof walls 104 are all soundproof walls facing the side direction Ds. The first side coupling soundproof wall 104a of the pair of side coupling soundproof walls 104 is disposed on the side of the first side direction Ds1 of the coupling device 10b. The second side coupling soundproof wall 104b of the pair of side coupling soundproof walls 104 is disposed on the side of the second side direction Ds2 of the coupling device 10b. The first side coupling soundproof wall 104a and the second side coupling soundproof wall 104b face each other in the side direction Ds. An end of the first axial side Da1 of the first side coupling soundproof wall 104a is connected to an end of the first axial direction Ds1 of the front coupling soundproof wall 102. An end of the first axial side Da2 of the first side coupling soundproof wall 104a is connected to an end of the first axial direction Ds1 of the rear coupling soundproof wall 103. An end of the second side coupling soundproof wall 104b on the first axial side Da1 is connected to an end of the front coupling soundproof wall 102 in the second lateral direction Ds2. An end of the second side coupling soundproof wall 104b on the second axial side Da2 is connected to an end of the rear coupling soundproof wall 103 in the second lateral direction Ds2.

[0097] The upper coupling soundproof wall 105 is a soundproof wall facing the vertical direction. This upper coupling soundproof wall 105 is disposed on the upper side of the coupling device 10b. The upper end of the front coupling soundproof wall 102, the upper end of the rear coupling soundproof wall 103, and the upper ends of the pair of side coupling soundproof walls 104 are all connected to the upper coupling soundproof wall 105.

[0098] The lower ends of the front coupling soundproof wall 102, the rear coupling soundproof wall 103, and the pair of side coupling soundproof walls 104 are fixed to an apparatus installation surface P above which the coupling device 10b is disposed. Thus, the coupling soundproof room 101 is fixed to the apparatus installation surface P.

[0099] A first through hole 106 penetrating from the inside to the outside of the coupling soundproof room 101 is formed in the lower part of the first side coupling soundproof wall 104a. A second through hole 107 penetrating from the inside to the outside of the coupling soundproof room 101 is formed in the upper coupling soundproof wall 105.

[0100] Each of the multiple soundproof walls constituting the coupling soundproof room 101 has a rigid substrate 109a and a sound absorbing material 109b attached to the substrate 109a.

[0101] The intake air flow path frame 111 is fixed to the outer surface of the first side coupling soundproof wall 104a. The intake air flow path frame 111 is formed with an intake air flow path 112 through which air from the outside can flow in. The intake air flow path 112 meanders in the vertical direction and communicates with the first through hole 106. Therefore, the outside air can be guided into the coupling soundproof room 101 through the intake air flow path 112. The exhaust air flow path frame 121 is fixed to the outer surface of the upper coupling soundproof wall 105. The exhaust air flow path frame 121 is formed with an exhaust air flow path 122 through which air can be exhausted to the outside. The exhaust air flow path 122 meanders in the lateral direction Ds and communicates with the second through hole 107. Therefore, the air in the coupling soundproof room 101 can be exhausted to the outside through the exhaust air flow path 122. Each of the intake passage frame 111 and the exhaust passage frame 121 has a rigid substrate 129a and a sound absorbing material 129b attached to the substrate 129a.

[0102] As described above, since the coupling device 10b of this embodiment is surrounded by the coupling soundproof room 101, sound leaking to the outside of the coupling soundproof room 101 can be suppressed.

[0103] When the first coupling flange 20, the second coupling flange 30, the spacer 40, and the multiple connectors 11 rotate in the coupling soundproof chamber 101, the temperature in the coupling soundproof chamber 101 rises. Therefore, in this embodiment, the coupling soundproof chamber 101 is provided with an intake flow path frame 111 and an exhaust flow path frame 121, which communicate the inside of the coupling soundproof chamber 101 with the outside, so that the inside of the coupling soundproof chamber 101 can be ventilated.

[0104] However, when the inside of the coupling soundproof room 101 is connected to the outside, sound inside the coupling soundproof room 101 is likely to leak to the outside. Therefore, in this embodiment, the intake air flow path 112 and the exhaust air flow path 122 are made to meander so that sound from inside the coupling soundproof room 101 does not go straight and leak to the outside. Furthermore, in this embodiment, by making the intake air flow path 112 and the exhaust air flow path 122 meander, the length of these flow paths is increased, and the amount of sound absorbed by the sound absorbing material 129b is increased.

[0105] In this embodiment, the coupling device 10b has a coupling cover 90. However, when the coupling device 10b has the coupling cover 90, the coupling soundproof room 101 may be omitted. Also, when the coupling device 10b has the coupling soundproof room 101, the coupling cover 90 of the coupling device 10b may be omitted.

[0106] "Variations" The spacer 40 of the coupling device 10b is a rotating body according to the present invention. However, if the first coupling flange 20 or the second coupling flange 30 has a hole and the rotation of these coupling flanges 20, 30 generates self-excited noise due to the hole or there is a possibility that self-excited vibration due to the hole may occur, these coupling flanges 20, 30 may be treated as a rotating body according to the present invention.

[0107] Furthermore, any rotating body other than the spacer 40, the first coupling flange 20, and the second coupling flange 30 may be treated as a rotating body of the present invention as long as it rotates about the axis Ar. For example, in the above embodiment, if the turbine rotor shaft 62 or the generator rotor shaft 82 has a hole and the rotation of these rotor shafts 62, 82 generates self-excited noise due to the hole or there is a possibility that self-excited vibration due to the hole may be generated, these rotor shafts 62, 82 may be treated as a rotating body according to the present invention.

[0108] In the above embodiments, the steam turbine 60 in which the rotor blades 63 are functional members and the generator 80 in which the magnets 83 are functional members have been exemplified as the rotating machine. However, the rotating machine is not limited to these, and may be a gas turbine in which the rotor blades are functional members, a pump in which an impeller is a functional member, a water turbine in which an impeller or the like is a functional member, a wind turbine in which blades are functional members, etc.

[0109] Although the embodiments of the present disclosure have been described in detail above, the present disclosure is not limited to the above embodiments. Various additions, modifications, substitutions, partial deletions, etc. are possible within the scope of the conceptual idea and intent of the present invention derived from the contents defined in the claims and their equivalents.

[0110] "Additional Notes" The rotating body in the above embodiment and modified examples can be understood as follows, for example.

[0111] (1) In the first aspect, the rotating body is A rotor 1, 40 that can rotate at a predetermined rotation speed around an axis Ar has holes 3a, 3b, 46a that open on a surface 2, 41 of the rotor 1, 40. An acoustic natural frequency fa determined by the inner diameter of the hole 3a, 3b, 46a and the depth of the hole 3a, 3b, 46a deviates from a vortex generation frequency Fk determined by the peripheral speed U of the opening 5, 5a, 46oa of the hole 3a, 3b, 46a at the predetermined rotation speed.

[0112] The inventors have noticed that when the rotor 1, 40 rotates, a vortex 6 is generated near the opening 5, 5a, 46oa of the hole 3a, 3b, 46a. The inventors have found that when the acoustic natural frequency fa of the hole 3a, 3b, 46a is close to the vortex generation frequency Fk of the vortex 6 generated around the opening 5, 5a, 46oa of the hole 3a, 3b, 46a, a self-excited noise caused by the hole 3a, 3b, 46a is generated, and when the acoustic natural frequency fa is deviated from the vortex generation frequency Fk, the self-excited noise caused by the hole 3a, 3b, 46a can be suppressed. Therefore, in this embodiment, the self-excited noise caused by the hole 3a, 3b, 46a can be suppressed.

[0113] (2) In the second embodiment, the rotating body is In the rotating bodies 1, 40 in the first embodiment, when the sound speed is C, the depth of the holes 3a, 3b, 46a is L, and the inner diameter of the holes 3a, 3b, 46a is D, the acoustic natural frequency fa is expressed by the following equation. fa = (C / 4) / (L+0.85×D / 2) When the peripheral speed U of the openings 5, 5a, 46oa when rotating at the predetermined rotation speed is U and the Strouhal number is St, the vortex generation frequency Fk is expressed by the following formula. Fk = St × (U / D)

[0114] (3) In the third embodiment, the rotating body is In the rotating body 1, 40 in the first embodiment or the second embodiment, the hole 3a, 46a has a cylindrical first inner circumferential surface 4a, 47a and a second inner circumferential surface 4b, 47b connecting an end of the first inner circumferential surface 4a, 47a to the surface 2, 41 of the rotating body 1, 40. The inner diameter of the second inner circumferential surface 4b, 47b gradually increases from the connecting position with the first inner circumferential surface 4a, 47a toward the connecting position with the surface 2, 41.

[0115] In this embodiment, the rotation of the rotors 1 and 40 can reduce the power of the vortex 6 generated near the openings 5a and 46oa of the holes 3a and 46a.

[0116] The coupling devices in the above-described embodiment and modified examples can be understood, for example, as follows. (4) In a fourth aspect, the coupling device comprises: The coupling flange 20 includes a spacer 40 which is a rotating body 40 in any one of the first to third embodiments, a first coupling flange 20 which is rotatable around the axis Ar at the predetermined rotation speed and which is arranged on an axial first side Da1 which is one side in the axial direction Da in which the axis Ar extends with respect to the spacer 40, a second coupling flange 30 which is rotatable around the axis Ar at the predetermined rotation speed and which is arranged on an axial second side Da2 which is the other side in the axial direction Da with respect to the spacer 40, and a connector 11 which connects the first coupling flange 20, the spacer 40, and the second coupling flange 30 to each other so that the first coupling flange 20, the spacer 40, and the second coupling flange 30 can rotate integrally.

[0117] In this embodiment, the generation of self-excited noise caused by the hole 46a of the spacer 40 when the first coupling flange 20, the spacer 40, and the second coupling flange 30 rotate together can be suppressed.

[0118] (5) In a fifth aspect, the coupling device comprises: In the coupling device 10a, 10b in the fourth embodiment, at least one of the first coupling flange 20 and the second coupling flange 30 has holes 25a, 26a, 35a, 36a that open on a surface 23, 33 of the at least one of the coupling flanges 20, 30. The openings of the holes 25a, 26a, 35a, 36a are closed by detachable covers 52, 53 for the holes 25a, 26a, 35a, 36a.

[0119] In this embodiment, noise caused by the holes 25a, 26a, 35a, 36a of the first coupling flange 20 or the second coupling flange 30 when the first coupling flange 20, the spacer 40, and the second coupling flange 30 rotate together can be suppressed.

[0120] (6) In a sixth aspect, the coupling device comprises: The coupling device 10b in the fourth or fifth embodiment includes an annular coupling cover 90 that is spaced apart from the first coupling flange 20, the spacer 40, and the second coupling flange 30 in the radial direction Dr relative to the axis Ar and covers an outer periphery of the first coupling flange 20, an outer periphery of the spacer 40, and an outer periphery of the second coupling flange 30. The coupling cover 90 has a sound absorbing portion 92 including a sound absorbing material 93.

[0121] In this embodiment, the coupling cover 90 can suppress sound leaking out of the coupling cover 90.

[0122] (7) In a seventh aspect, the coupling device comprises: In the coupling device 10b according to the sixth embodiment, the coupling cover 90 has a support material 91 that is annular about the axis Ar and has a plurality of through holes formed therein that penetrate from the inner periphery side to the outer periphery side. The sound absorbing part 92 is disposed on the outer periphery side of the support material 91 and is supported by the support material 91.

[0123] (8) In an eighth aspect, the coupling device comprises: In the coupling device 10b in the seventh aspect, the sound absorbing portion 92 has a plurality of sound absorbing materials 93 arranged in a radial direction Dr relative to the axis Ar, and a sound insulating plate 94 arranged between the plurality of sound absorbing materials 93.

[0124] In this embodiment, the coupling cover 90 can effectively suppress sound leaking out of the coupling cover 90.

[0125] (9) In a ninth aspect, the coupling device comprises: In the coupling device 10b in the eighth aspect, the sound absorbing portion 92 has a sound insulating plate 94 that is arranged between the support material 91 and the sound absorbing material 93 that is arranged innermost in the radial direction Dr among the plurality of sound absorbing materials 93.

[0126] (10) In a tenth aspect, the coupling device comprises: The coupling device 10b in the ninth embodiment has an inner sound absorbing material 95 disposed between the support material 91 and the sound absorbing portion 92 in the radial direction Dr.

[0127] In this embodiment, the inner sound absorbing material 95 can absorb a portion of the sound from the noise source before the sound reaches the innermost sound insulation plate 94. Therefore, in this embodiment, by disposing the inner sound absorbing material 95, it is possible to effectively suppress sound leaking out of the coupling device 10b.

[0128] The coupling equipment in the above embodiment and modified examples can be understood, for example, as follows.

[0129] (11) In an eleventh aspect, the coupling equipment comprises: The coupling soundproof room 101 includes the coupling devices 10a and 10b according to any one of the fourth to tenth embodiments, and is fixed to an apparatus installation surface P above which the coupling devices 10a and 10b are disposed, and is spaced apart from the coupling devices 10a and 10b to cover the coupling devices 10b. A wall forming the coupling soundproof room 101 includes a sound-absorbing material 109b.

[0130] In this embodiment, the coupling soundproof room 101 can suppress sound leaking out to the outside of the coupling soundproof room 101.

[0131] (12) In a twelfth aspect, the coupling equipment comprises: The coupling equipment 100 in the eleventh aspect includes an intake passage frame 111 arranged outside the coupling soundproof room 101 and having an intake passage 112 through which air can flow in from the outside, and an exhaust passage frame 121 arranged outside the coupling soundproof room 101 and having an exhaust passage 122 through which air can be exhausted to the outside. The coupling soundproof room 101 has a first through hole 106 and a second through hole 107 that penetrate from the inside to the outside of the coupling soundproof room 101. The intake passage 112 is meandering and communicates with the first through hole 106. The exhaust passage 122 is meandering and communicates with the second through hole 107. Both the intake passage frame 111 and the exhaust passage frame 121 have sound absorbing material 129b.

[0132] In this embodiment, the air in the coupling soundproof room 101 can be ventilated. In this way, if the air in the coupling soundproof room 101 can be ventilated, sound in the coupling soundproof room 101 is more likely to leak to the outside. Therefore, in this embodiment, the intake air flow path 112 and the exhaust air flow path 122 are made to meander so that sound from inside the coupling soundproof room 101 does not go straight and leak to the outside. Furthermore, in this embodiment, by making the intake air flow path 112 and the exhaust air flow path 122 meander, the length of these flow paths is increased, and the amount of sound absorbed by the sound absorbing material 129b is increased.

[0133] The rotating machinery equipment in the above-described embodiment and modified examples can be understood, for example, as follows.

[0134] (13) In a thirteenth aspect, the rotating machinery equipment comprises: The coupling device 10a, 10b according to any one of the fourth to tenth aspects includes a rotary machine 60 having a rotor 61 rotatable around the axis Ar at the predetermined rotation speed and a casing 65 covering a part of the rotor 61, and an enclosure 70 covering at least the casing 65 of the rotary machine 60. The rotor 61 includes a rotor shaft 62 extending in the axial direction Da around the axis Ar, a functional member 63 fixed to the outer periphery of the rotor shaft 62 and rotating integrally with the rotor shaft 62 to perform a function required of the rotary machine 60, and the first coupling flange 20 fixed to an end of the rotor shaft in the axial direction Da. The casing 65 does not cover the first coupling flange 20 but covers the functional member 63. The axis Ar extends in a direction including a horizontal direction. The enclosure 70 has an upper coupling soundproof wall 78 spaced upward from the coupling device 10b, and a pair of side coupling soundproof walls 77 spaced from the coupling device 10b in a side direction Ds perpendicular to the axis Ar. A first side coupling soundproof wall 77a of the pair of side coupling soundproof walls 77 is disposed on the first side direction Ds1 side with respect to the coupling device 10b, among both sides of the side direction Ds. A second side coupling soundproof wall 77b of the other of the pair of side coupling soundproof walls 77 is disposed on the second side direction Ds2 side with respect to the coupling device 10b, among both sides of the side direction Ds. The upper coupling soundproof wall 78 and the pair of side coupling soundproof walls 77 are connected to each other. The upper coupling soundproof wall 78 and the pair of side coupling soundproof walls 77 have sound absorbing materials 79b.

[0135] In this embodiment, since the coupling devices 10a, 10b are covered by the enclosure 70 of the rotating machine, it is possible to suppress noise leaking to the outside from the coupling devices 10a, 10b.

[0136] The manufacturing method of the rotating body in the above embodiment and modified example can be understood as follows, for example. (14) A method for producing a rotating body according to a fourteenth aspect includes the steps of: The method for manufacturing a rotor (1, 40) has holes (3a, 3b, 46a) that open to a surface (2, 41) and rotates at a predetermined rotation speed around an axis Ar. This manufacturing method includes a design process S10 for designing a rotating body 1, 40 having the hole 3, 46, a determination process S11 for determining whether or not self-excited noise caused by the hole 3, 46 is likely to occur depending on whether an acoustic natural frequency fa determined by the inner diameter of the hole 3, 46 and the depth of the hole 3, 46 determined in the design process S10 deviates from a vortex generation frequency Fk determined by the peripheral speed U of the opening 5, 46o of the hole 3, 46 at the specified rotation speed, a re-design process S12 for modifying the size of the hole 3, 46 determined in the design process S10, and a manufacturing process S13 for manufacturing the rotating body 1, 40 determined in the re-design process S12.

[0137] In the rotors 1, 40 manufactured by the manufacturing method of this embodiment, self-excited noise caused by the holes 3a, 3b, 46a can be suppressed, similarly to the rotors 1, 40 in the first embodiment.

[0138] (15) A method for producing a rotating body according to a fifteenth aspect includes the steps of: In the manufacturing method of the rotating body in the fourteenth aspect, when the sound speed is C, the depth of the holes 3, 46 is L, and the inner diameter of the holes 3, 46 is D, the acoustic natural frequency fa is expressed by the following formula. fa = (C / 4) / (L+0.85×D / 2) When the peripheral speed U of the openings 5, 46o when rotating at the predetermined rotation speed is U and the Strouhal number is St, the vortex generation frequency Fk is expressed by the following formula. Fk = St × (U / D)

[0139] The noise prevention method for a rotating body in the above embodiment and modified examples can be understood as follows, for example. (16) A method for preventing noise from a rotating body in a sixteenth aspect, comprising: This is a noise prevention method for a rotor 1,40 that has a hole 3,46 opening on a surface 2,41 and rotates at a predetermined rotation speed around an axis Ar. This noise prevention method includes a determination step S1 for determining whether or not self-excited noise caused by the hole 3,46 is generated when the rotor 1,40 is rotated at the predetermined rotation speed around the axis Ar, and a hole modification step S2 for increasing the depth of the hole 3,46 or the inner diameter of the hole 3,46 when it is determined in the determination step S1 that self-excited noise is generated.

[0140] In the rotating body 1, 40 in which the holes 3, 46 have been modified by the noise prevention method of this embodiment, self-excited noise caused by the holes 3, 46 can be suppressed, similar to the rotating body 1, 40 in the first embodiment.

[0141] (17) A method for preventing noise from a rotating body in a seventeenth aspect comprises the steps of: In the sixteenth aspect of the noise prevention method for a rotating body, in the hole modification process S2, the corner between the surface 2,41 and the inner surface of the hole 3,46 is ground so that the inner diameter of the hole 3,46 gradually becomes larger as it approaches the surface 2,41.

[0142] In the rotors 1, 40 in which the holes 3, 46 have been modified by the noise prevention method of this embodiment, the power of vortexes generated near the openings 5a, 46oa of the holes 3a, 46a can be reduced, similar to the rotors 1, 40 in the fourth embodiment. [Industrial Applicability]

[0143] According to one aspect of the present disclosure, it is possible to reduce the effort required to use the holes while suppressing noise caused by the holes when the rotating body is rotated. [Explanation of symbols]

[0144] 1: Rotating body 2: Surface 3,3a,3b:hole 4: Inner surface 4a: First inner peripheral surface 4b: Second inner peripheral surface 5,5a:Aperture 6: Vortex 10, 10a, 10b: Coupling device 11: Connector 12: Bolt 13: Nut 20: First coupling flange 21: Outer surface 22: Contact surface 23: Non-contact surface (surface) 24:Bolt hole 25, 25a: Jack hole 25s, 25sa: Female thread 25o: opening 26, 26a: Balance hole 26s: Female thread 26o: opening 30: Second coupling flange 31: Outer surface 32: Contact surface 33: Non-contact surface (surface) 34: Bolt hole 35, 35a: Jack hole 35s, 35sa: Female thread 35o: opening 36, 36a: Balance hole 36s: Female thread 36o: opening 40: Spacer (rotating body) 41: Outer surface (surface) 42:First contact surface 43:Second contact surface 44: Bolt hole 46: Lifting hole 46o, 46oa: opening 47: Inner surface 47a: First inner peripheral surface 47b: Second inner peripheral surface 51: Jack bolt 52,53:Threaded plug (lid) 54: Eye bolt 60: Steam turbine 61: Turbine rotor 62: Turbine rotor shaft 63: Moving blades (functional components) 64: Coupling flange 65: Turbine casing 67a: First bearing device 67b: Second bearing device 68: Bearings 69: Bearing casing 70: Enclosure 71: Front soundproof wall 72: Side soundproof wall 72a: First side soundproof wall 72b: Second side soundproof wall 73: Rear soundproof wall 73a: First rear soundproof wall 73b: Second rear soundproof wall 74: Upper soundproof wall 75: After-shift soundproof wall 76: Retractable side soundproof wall 76a: First retract side soundproof wall 76b: Second recessed side soundproof wall 77: Lateral coupling soundproof wall 77a: First side coupling soundproof wall 77b: Second side coupling soundproof wall 78: Upper coupling soundproof wall 78m: Middle edge 79a: Board 79b: Sound absorbing material 80: Generator 81: Generator rotor 82: Generator rotor shaft 83: Magnet 84: Coupling flange 85: Generator casing 86: Coil 90: Coupling cover 91: Support material 92: Sound absorbing section 93: Sound absorbing material 93a: First sound absorbing material 93b:Second sound absorbing material 93c: Third sound absorbing material 93d: Fourth sound absorbing material 93e: Fifth sound absorbing material 94: Soundproofing board 95:Inner sound absorbing material 100: Coupling equipment 101: Coupling soundproof room 102: Front coupling soundproof wall 103: Rear coupling soundproof wall 104: Lateral coupling soundproof wall 104a: First side coupling soundproof wall 104b: Second side coupling soundproof wall 105: Upper coupling soundproof wall 106:First through hole 107:Second through hole 109a: Substrate 109b: Sound absorbing material 111: Intake passage frame 112: Intake passage 121: Exhaust flow path frame 122: Exhaust flow path 129a: Substrate 129b: Sound absorbing material Ar: Axis line Da: Axial direction Da1: Axis line first side Da2: Second axis side Dc: Circumferential direction Dr: Radial direction Ds: Lateral direction Ds1: First side direction Ds2: Second side direction P: Equipment installation surface

Claims

1. A coupling device, a coupling soundproof room that is fixed to an apparatus installation surface above which the coupling device is disposed, covers the front, rear, left, right and top of the coupling device, and has a sound absorbing material, the coupling soundproof room being spaced apart from the coupling device; Equipped with The coupling device comprises: a spacer that is rotatable around an axis at a predetermined number of rotations; a first coupling flange that is rotatable about the axis at the predetermined rotation speed and that is disposed on an axial first side that is one side in the axial direction in which the axis extends with respect to the spacer; a second coupling flange that is rotatable about the axis at the predetermined rotation speed and that is disposed on a second axial side that is the other side in the axial direction with respect to the spacer; a connector that connects the first coupling flange, the spacer, and the second coupling flange to each other such that the first coupling flange, the spacer, and the second coupling flange can rotate together; having the spacer has a hole opening on a surface of the spacer; an acoustic natural frequency determined by the inner diameter of the hole and the depth of the hole is deviated from a vortex generation frequency determined by the peripheral speed of the opening of the hole at the predetermined rotation speed; Coupling equipment.

2. In the coupling equipment according to claim 1, an intake passage frame disposed outside the coupling soundproof room and having an intake passage through which air from the outside can flow; An exhaust flow path frame is disposed outside the coupling soundproof room and has an exhaust flow path formed therein for exhausting air to the outside; Equipped with The coupling soundproof chamber has a first through hole and a second through hole penetrating from the inside to the outside of the coupling soundproof chamber, The intake passage is serpentine and communicates with the first through hole, The exhaust flow path is serpentine and communicates with the second through hole, The intake passage frame and the exhaust passage frame each have a sound absorbing material. Coupling equipment.

3. 3. The coupling equipment according to claim 1 or 2, When the sound speed is C, the depth of the hole is L, and the inner diameter of the hole is D, the acoustic natural frequency fa is expressed by the following equation: fa=(C / 4) / (L+0.85×D / 2) When the circumferential speed of the opening when rotating at the predetermined rotation speed is U and the Strouhal number is St, the vortex generation frequency Fk is expressed by the following formula: Fk=St×(U / D) Coupling equipment.

4. 3. The coupling equipment according to claim 1 or 2, The hole has a cylindrical first inner circumferential surface and a second inner circumferential surface connecting an end of the first inner circumferential surface and a surface of the spacer, The inner diameter of the second inner circumferential surface gradually increases from a connection position with the first inner circumferential surface toward a connection position with the surface. Coupling equipment.

5. In the coupling equipment according to claim 1 or 2, At least one of the first coupling flange and the second coupling flange has a hole that opens on a surface of the at least one coupling flange, The opening of the hole is closed by a detachable cover for the hole. Coupling equipment.

6. In the coupling equipment according to claim 1 or 2, a ring-shaped coupling cover that is spaced apart from the first coupling flange, the spacer, and the second coupling flange in a radial direction relative to the axis and covers an outer periphery of the first coupling flange, an outer periphery of the spacer, and an outer periphery of the second coupling flange; The coupling cover has a sound absorbing portion including a sound absorbing material. Coupling equipment.

7. 7. The coupling device according to claim 6, the coupling cover has a support material that is annular about the axis and has a plurality of through holes formed therein, the through holes extending from an inner periphery side to an outer periphery side, The sound absorbing portion is disposed on the outer circumferential side of the support material and is supported by the support material. Coupling equipment.

8. 8. The coupling device according to claim 7, The sound absorbing unit has a plurality of sound absorbing materials arranged in a radial direction with respect to the axis line, and a sound insulating plate arranged between the plurality of sound absorbing materials. Coupling equipment.

9. 9. The coupling device according to claim 8, The sound absorbing section has a sound insulating plate disposed between the sound absorbing material disposed most inward in the radial direction among the plurality of sound absorbing materials and the support material. Coupling equipment.

10. 10. The coupling installation according to claim 9, An inner sound absorbing material is disposed between the support material and the sound absorbing portion in the radial direction. Coupling equipment.

11. A coupling device, A rotary machine including a rotor that can rotate at a predetermined rotation speed and a casing that covers a part of the rotor; an enclosure that covers at least the casing of the rotary machine; Equipped with The coupling device comprises: a spacer that is rotatable around an axis at the predetermined number of rotations; a first coupling flange that is rotatable about the axis at the predetermined rotation speed and that is disposed on an axial first side that is one side in the axial direction in which the axis extends with respect to the spacer; a second coupling flange that is rotatable about the axis at the predetermined rotation speed and that is disposed on a second axial side that is the other side in the axial direction with respect to the spacer; a connector that connects the first coupling flange, the spacer, and the second coupling flange to each other such that the first coupling flange, the spacer, and the second coupling flange can rotate together; having the spacer has a hole opening on a surface of the spacer; an acoustic natural frequency determined by an inner diameter of the hole and a depth of the hole is shifted from a vortex generation frequency determined by a peripheral speed of an opening of the hole at the predetermined rotation speed, the rotor includes a rotor shaft extending in the axial direction centered on the axis, a functional member fixed to an outer periphery of the rotor shaft and rotating integrally with the rotor shaft to exhibit a function required of the rotary machine, and the first coupling flange fixed to an end of the rotor shaft in the axial direction, The casing covers the functional member without covering the first coupling flange, The axis extends in a direction including the horizontal direction, The enclosure has an upper coupling soundproof wall spaced upward from the coupling device, and a pair of side coupling soundproof walls spaced laterally from the coupling device in a direction perpendicular to the axis, A first lateral coupling soundproof wall of the pair of lateral coupling soundproof walls is disposed on a first lateral direction side with respect to the coupling device among both sides in the lateral direction, and a second lateral coupling soundproof wall of the pair of lateral coupling soundproof walls is disposed on a second lateral direction side with respect to the coupling device among both sides in the lateral direction, The upper coupling soundproof wall and the pair of side coupling soundproof walls are connected to each other, The upper coupling soundproof wall and the pair of side coupling soundproof walls have sound absorbing materials. Rotating machinery equipment.

12. In the rotating machinery equipment according to claim 11, When the sound speed is C, the depth of the hole is L, and the inner diameter of the hole is D, the acoustic natural frequency fa is expressed by the following equation: fa=(C / 4) / (L+0.85×D / 2) When the circumferential speed of the opening when rotating at the predetermined rotation speed is U and the Strouhal number is St, the vortex generation frequency Fk is expressed by the following formula: Fk=St×(U / D) Rotating machinery equipment.

13. In the rotating machinery equipment according to claim 11, The hole has a cylindrical first inner circumferential surface and a second inner circumferential surface connecting an end of the first inner circumferential surface and a surface of the spacer, The inner diameter of the second inner circumferential surface gradually increases from a connection position with the first inner circumferential surface toward a connection position with the surface. Rotating machinery equipment.

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