Geared compressor

Abstract

We offer a geared compressor with reduced weight. [Solution] The geared compressor comprises a drive shaft extending in a first direction, a main gear fixed to the drive shaft, a first auxiliary gear meshing with the main gear, a second auxiliary gear meshing with the main gear, a first shaft fixed to the first auxiliary gear, a second shaft fixed to the second auxiliary gear, a pair of first bearings rotatably supporting the first shaft, a pair of second bearings rotatably supporting the second shaft, and a casing. The casing has casing side plates extending in surfaces intersecting in a first direction, a pair of first bearing housings fixed to the casing side plates and each fixing a pair of first bearings, and a pair of second bearing housings fixed to the casing side plates and each fixing a pair of second bearings. The casing side plates are formed to be thinner in the first direction than the first bearing housings and the second bearing housings, and the second bearing housings are formed to be thinner in the first direction than the first bearing housings.

Description

[Technical Field]

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

[0002] A centrifugal compressor, which is a rotating machine, allows fluid to pass through in a radial direction of a rotating impeller, and compresses the fluid by using centrifugal force generated at that time.

[0003] For example, Patent Document 1 discloses, as one type of such centrifugal compressor, a gear-driven turbo compressor (geared compressor) including: a large gear shaft having a large gear rotationally driven by a drive device; a small gear shaft having a small gear meshing with the large gear; and an impeller fixed to an end of the small gear shaft. [Prior Art Documents] [Patent Documents]

[0004] [Patent Document 1] International Publication No. WO 2010 / 095507 [Summary of the Invention] [Problem to be Solved by the Invention]

[0005] Incidentally, in such a geared compressor, there are cases where a casing that accommodates the large gear and the small gear has an integrally formed portion through which the large gear shaft is inserted and a portion through which the small gear shaft is inserted. In such a case, the degree of freedom in design of the casing is reduced. Further, the weight of the entire geared compressor is increased. Therefore, there is a demand for a configuration that can further reduce the weight of the entire geared compressor.

[0006] The present disclosure has been made to solve the above problem, and an object of the present disclosure is to provide a geared compressor with further reduced weight. [Means for Solving the Problem]

[0007] To solve the above problems, the geared compressor according to this disclosure includes a drive shaft extending around an axis extending in a first direction and rotated around the axis, a main gear fixed to the drive shaft and rotating together with the drive shaft around the axis, a first sub-gear that meshes with the main gear and rotates, a second sub-gear positioned on the opposite side of the first sub-gear with respect to the main gear in a second direction intersecting the first direction and meshing with the main gear and rotating, a first shaft fixed to the first sub-gear and extending in the first direction, a second shaft fixed to the second sub-gear and extending in the first direction, a pair of first bearings rotatably supporting the first shaft and positioned apart in the first direction, and a rotatably supporting the second shaft The gear comprises a pair of second bearings spaced apart in the first direction, and a casing that houses the main gear, the first auxiliary gear, and the second auxiliary gear. The casing has casing side plates extending in a plane intersecting the first direction, a pair of first bearing housings fixed to the casing side plates and each fixing the pair of first bearings, and a pair of second bearing housings fixed to the casing side plates and each fixing the pair of second bearings. The casing side plates are formed to be thinner in the first direction than the first bearing housings and the second bearing housings, and the second bearing housings are formed to be thinner in the first direction than the first bearing housings. [Effects of the Invention]

[0008] According to the geared compressor of this disclosure, the weight can be further reduced. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic horizontal cross-sectional view showing the configuration of a geared compressor according to an embodiment of the present disclosure. [Figure 2] This is a plan view of a geared compressor according to an embodiment of the present disclosure, as seen from a first direction. [Figure 3] This figure shows the configuration of a geared compressor according to an embodiment of the present disclosure, and is a cross-sectional view taken along the line III-III in Figure 1. [Figure 4]This is a schematic horizontal cross-sectional view showing the configuration of a geared compressor, which is a comparative example of the geared compressor according to the embodiment of this disclosure. [Modes for carrying out the invention]

[0010] Hereinafter, embodiments for implementing the geared compressor 1 according to the present invention will be described with reference to Figures 1 to 3. However, this disclosure is not limited to these embodiments.

[0011] (Configuration of a geared compressor) Figure 1 is a schematic horizontal cross-sectional view showing the configuration of a geared compressor 1 according to this embodiment. The geared compressor 1 has a multi-shaft, multi-stage configuration that compresses fluid by rotating multiple impellers by rotating multiple gears. The geared compressor 1 includes a drive shaft 10, a main gear 12, a first auxiliary gear 22, a second auxiliary gear 32, a first shaft 20, a second shaft 30, a pair of first bearings 24, a pair of second bearings 34, a first impeller 26, a second impeller 36, a casing 50, and a supply pipe 80.

[0012] (Drive shaft) The drive shaft 10 extends around an axis O that extends in a first direction D1. The drive shaft 10 is formed in a cylindrical shape around axis O. The drive shaft 10 is installed so as to penetrate the casing 50 in the first direction D1. The drive shaft 10 is made rotatable around axis O by a drive source (not shown). As a drive source, for example, an electric motor, a steam turbine, etc., can be used. The drive shaft 10 is rotatably supported relative to the casing 50 by a bearing (journal bearing) (not shown).

[0013] (Main gear) The main gear 12 is fixed to the drive shaft 10. The main gear 12 is rotatable together with the drive shaft 10 around axis O. The main gear 12 transmits the rotation of the drive shaft 10 to the first auxiliary gear 22 and the second auxiliary gear 32. The main gear 12 is an external gear formed in the shape of a disc with axis O as its center. In this embodiment, the main gear 12 has a larger outer diameter than the first auxiliary gear 22 and the second auxiliary gear 32. The main gear 12 is housed inside the casing 50.

[0014] (First sub-gear) The first sub-gear 22 rotates in mesh with the main gear 12. The first sub-gear 22 is fixed to or integrated with the first shaft 20. The first sub-gear 22 is positioned on the first side D2a of the second direction D2, which intersects the first direction D1 with respect to the main gear 12. The first sub-gear 22 is an external gear formed in the shape of a disc with a first centerline O1 that extends parallel to the axis O on the first side D2a of the second direction D2 with respect to the axis O. The first sub-gear 22 rotates around the first centerline O1 as the main gear 12 rotates. In this embodiment, the first sub-gear 22 is formed with a smaller outer diameter than the main gear 12. The first sub-gear 22 is housed inside the casing 50.

[0015] (Second Sub-Gear) The second auxiliary gear 32 rotates in mesh with the main gear 12. The second auxiliary gear 32 is fixed to or integrated with the second shaft 30. The second auxiliary gear 32 is positioned on the second side D2b of the second direction D2 relative to the main gear 12. That is, the second auxiliary gear 32 is positioned on the opposite side of the first auxiliary gear 22 with respect to the main gear 12 in the second direction D2. The second auxiliary gear 32 is an external gear formed in the shape of a disc with a second centerline O2 that extends parallel to the axis O on the second side D2b of the second direction D2 relative to the axis O. The second auxiliary gear 32 rotates around the second centerline O2 as the main gear 12 rotates. In this embodiment, the second auxiliary gear 32 is formed with a smaller outer diameter than the main gear 12. The second auxiliary gear 32 is housed inside the casing 50.

[0016] In the present embodiment, directions are defined as follows. As described above, the direction in which the axis O extends is defined as the first direction D1. Additionally, a direction intersecting (for example, orthogonal to) the axis O is defined as the second direction D2. Further, a direction intersecting (for example, orthogonal to) both the first direction D1 and the second direction D2 is defined as the third direction D3. The third direction D3 is a vertical direction. That is, the first direction D1 and the second direction D2 are horizontal directions. For convenience of description, regarding the first direction D1, the upper side in FIG. 1 is defined as one side D1a of the first direction D1, and the lower side in FIG. 1 is defined as the other side D1b of the first direction D1. For example, a drive source (not shown) is arranged outside the casing 50 on the one side D1a of the drive shaft 10 in the first direction D1.

[0017] (First shaft) The first shaft 20 is fixed to or integrated with the first auxiliary gear 22. The first shaft 20 extends in the first direction D1. The first shaft 20 is formed in a columnar shape centered on the first center line O1. The first shaft 20 is arranged spaced apart from the axis O on the first side D2a in the second direction D2. The first shaft 20 is provided so as to penetrate the casing 50 in the first direction D1. The first shaft 20 is rotatably supported by a pair of first bearings 24. The first shaft 20 is rotatable about the first center line O1 as the drive shaft 10 rotates.

[0018] (Second shaft) The second shaft 30 is fixed to or integrated with the second auxiliary gear 32. The second shaft 30 extends in the first direction D1. The second shaft 30 is formed in a columnar shape centered on the second center line O2. The second shaft 30 is arranged spaced apart from the axis O on the second side D2b in the second direction D2. The second shaft 30 is provided so as to penetrate the casing 50 in the first direction D1. The second shaft 30 is rotatably supported by a pair of second bearings 34. The second shaft 30 is rotatable about the second center line O2 as the drive shaft 10 rotates.

[0019] In the present embodiment, the second shaft 30 is formed in a cylindrical shape with a smaller diameter than the first shaft 20. Also, the second shaft 30 is formed shorter in the first direction D1 than the first shaft 20. Furthermore, as shown in FIG. 2, the drive shaft 10, the first shaft 20 and the second shaft 30 of the present embodiment are arranged such that their centers are at the same height in the third direction D3. In other words, the drive shaft 10, the first shaft 20 and the second shaft 30 are arranged such that their centers are aligned in a straight line. That is, the axis O, the first center line O1 and the second center line O2 are arranged at the same height in the third direction D3 (vertical direction) so as to be arranged on the same virtual plane.

[0020] (First Bearing) The first bearing 24 rotatably supports the first shaft 20 relative to the casing 50. The first bearing 24 is a journal bearing. As shown in FIG. 1, a pair of the first bearings 24 are arranged spaced apart in the first direction D1. The pair of first bearings 24 are arranged so as to sandwich the first auxiliary gear 22 in the first direction D1. Both of the pair of first bearings 24 are fixed to the casing 50. For the pair of first bearings 24, the distance in the first direction D1 is defined as a first bearing span L1. More specifically, the first bearing span L1 is the distance between the center portions of the respective first bearings 24 in the first direction D1.

[0021] (Second Bearing) The second bearing 34 rotatably supports the second shaft 30 relative to the casing 50. The second bearing 34 is a journal bearing. A pair of the second bearings 34 are arranged spaced apart in the first direction D1. The pair of second bearings 34 are arranged so as to sandwich the second auxiliary gear 32 in the first direction D1. Both of the pair of second bearings 34 are fixed to the casing 50. Due to the diameter relationship between the first shaft 20 and the second shaft 30, the inner diameter of the second bearing 34 is formed smaller than that of the first bearing 24. Also, the width of the second bearing 34 in the first direction D1 is formed smaller than that of the first bearing 24.

[0022] For a pair of second bearings 34, the distance in the first direction D1 is defined as the second bearing span L2. More specifically, the second bearing span L2 is the distance between the centers of each second bearing 34 in the first direction D1. In this embodiment, the relationship between the first bearing span L1 and the second bearing span L2 is such that L2 / L1 is less than 1. Preferably, the value of L2 / L1 is 0.9 or less.

[0023] (Impeller) The first shaft 20 and the second shaft 30 are equipped with impellers at both ends in the first direction D1. The first shaft 20 has a first impeller 26 fixed to both ends in the first direction D1. The second shaft 30 has a second impeller 36 fixed to both ends in the first direction D1. The first impeller 26 and the second impeller 36 compress the fluid. In this embodiment, the second impeller 36 compresses the fluid at a higher pressure than the first impeller 26. For example, the second impeller 36 compresses the fluid compressed by the first impeller 26. That is, the second shaft 30 is capable of rotating at a higher speed than the first shaft 20. Also, the second impeller 36 is smaller in size than the first impeller 26. Note that the pair of first impellers 26 may be of different sizes. Similarly, the pair of second impellers 36 may be of different sizes.

[0024] (Casing configuration) The casing 50 is formed to house the main gear 12, the first auxiliary gear 22, and the second auxiliary gear 32 inside. As shown in Figure 2, the casing 50 has an upper casing 50A and a lower casing 50B. The upper casing 50A and the lower casing 50B are formed to divide the casing 50 in a third direction D3. Specifically, the casing side plate 52, the closing plate 53, the first bearing housing 60, and the second bearing housing 70 are separable in the third direction D3. In the following description, only the lower casing 50B will be explained. For example, in Figure 3, the upper casing 50A is omitted. As shown in Figure 1, the casing 50 includes a casing side plate 52, a closing plate 53, a pair of first bearing housings 60, a pair of second bearing housings 70, a bearing support portion 54, and a bottom plate 56.

[0025] (Casing side panel) The casing side plates 52 extend in the direction intersecting the first direction D1. That is, the casing side plates 52 extend in the second direction D2 and the third direction D3. The casing side plates 52 are formed with a constant thickness in the first direction D1 across their entire surface. The casing side plates 52 are formed to be thinner in the first direction D1 than the first bearing housing 60 and the second bearing housing 70. The casing side plates 52 are formed so that the drive shaft 10, the first shaft 20, and the second shaft 30 can be inserted through them. A pair of casing side plates 52 are arranged spaced apart in the first direction D1 so as to sandwich the main gear 12, the first auxiliary gear 22, and the second auxiliary gear 32 in the first direction D1. The casing side plates 52 are fixed to the bottom plate 56 at their lower ends in the third direction D3. The bottom plate 56 is a plate-shaped member that extends horizontally.

[0026] (occlusion plate) The closing plate 53 extends in a plane that intersects the second direction D2. That is, the closing plate 53 extends in the first direction D1 and the third direction D3. A pair of closing plates 53 are arranged spaced apart in the second direction D2 so as to close off a pair of casing side plates 52 in the second direction D2. That is, the pair of closing plates 53 are arranged to sandwich the main gear 12, the first auxiliary gear 22, and the second auxiliary gear 32 in the second direction D2.

[0027] (First bearing housing) The first bearing housing 60 secures the first bearing 24. The first bearing housing 60 is fixed to the casing side plate 52. The first bearing housing 60 is arranged in pairs, each securing a pair of first bearings 24. That is, the first bearing housings 60 are arranged in pairs spaced apart in the first direction D1. The shape of the first bearing housing 60, as viewed from the first direction D1, is annular. The first bearing housing 60 is fixed to the first bearing 24 on its inner circumferential surface and to the casing side plate 52 on its outer circumferential surface. Furthermore, the first bearing housing 60 is spaced apart from the drive shaft 10 in the second direction D2.

[0028] In a pair of first bearing housings 60, the surfaces facing each other in the first direction D1 (facing inward in the first direction D1) are defined as the inner surfaces 62 of the first housings. In the pair of first bearing housings 60, the surfaces facing outward in the first direction D1 are defined as the outer surfaces 64 of the first housings. In the first bearing housings 60, the inner surfaces 62 of the first housings are arranged to be coplanar with the inner surface of the casing side plate 52. In addition, in the first bearing housings 60, the outer surfaces 64 of the first housings protrude in the first direction D1 beyond the outer surface of the casing side plate 52. That is, in the first bearing housings 60, the thickness in the first direction D1 is greater than that of the casing side plate 52. Furthermore, in the first bearing housings 60, the thickness in the first direction D1 is formed to be approximately the same as that of the first bearing 24.

[0029] (Second bearing housing) The second bearing housing 70 secures the second bearing 34. The second bearing housing 70 is fixed to the casing side plate 52. The second bearing housing 70 is arranged in pairs, each securing a pair of second bearings 34. That is, the second bearing housings 70 are arranged in pairs spaced apart in the first direction D1. The shape of the second bearing housing 70, as viewed from the first direction D1, is annular. The second bearing housing 70 is fixed to the second bearing 34 on its inner circumferential surface and to the casing side plate 52 on its outer circumferential surface. Furthermore, the second bearing housing 70 is spaced apart from the drive shaft 10 in the second direction D2. Note that the outer diameter of the second bearing housing 70 is smaller than that of the first bearing housing 60 due to the relationship between the diameters of the first shaft 20 and the second shaft 30.

[0030] In a pair of second bearing housings 70, the surfaces facing each other in the first direction D1 (facing inward in the first direction D1) are defined as the inner surfaces 72 of the second housings. In the pair of second bearing housings 70, the surfaces facing outward in the first direction D1 are defined as the outer surfaces 74 of the second housings. In the second bearing housings 70, the inner surfaces 72 of the second housings are arranged to be coplanar with the inner surface of the casing side plate 52. In addition, in the second bearing housings 70, the outer surfaces 74 of the second housings protrude in the first direction D1 beyond the outer surface of the casing side plate 52. That is, in the second bearing housings 70, the thickness in the first direction D1 is greater than that of the casing side plate 52. Furthermore, in the second bearing housings 70, the thickness in the first direction D1 is formed to be approximately the same as that of the second bearing 34.

[0031] As described above, in the first direction D1, the distance between the pair of inner surfaces 62 of the first housing is equal to the distance between the pair of inner surfaces 72 of the second housing. On the other hand, in the first direction D1, the distance between the pair of outer surfaces 64 of the first housing is greater than the distance between the pair of outer surfaces 74 of the second housing. In other words, the second bearing housing 70 is formed to be thinner in the first direction D1 than the first bearing housing 60.

[0032] (Bearing support part) The bearing support portion 54 is formed and positioned to support the first bearing housing 60 and the second bearing housing 70 from below in the vertical direction. The bearing support portion 54 is fixed to the outer surface of the casing side plate 52 and extends vertically. The bearing support portion 54 connects each of the first bearing housing 60 and the second bearing housing 70 to the bottom plate 56 in a third direction D3. That is, the bearing support portion 54 is positioned to support each of the first bearing housing 60 and the second bearing housing 70. As shown in Figures 2 and 3, the bearing support portion 54 extends from below the first bearing housing 60 and the second bearing housing 70 in the third direction D3.

[0033] Furthermore, the bearing support portion 54 is positioned so that its centers coincide with those of the first shaft 20 or the second shaft 30 in the second direction D2. The bearing support portion 54 is formed to be narrower in width than the first bearing housing 60 and the second bearing housing 70 in the second direction D2. In addition, the bearing support portion 54 is formed so that its end in the first direction D1 is nearly coplanar with the outer surface 64 of the first housing or the outer surface 74 of the second housing (see Figure 3). The bearing support portion 54 may be adjusted to the required size according to the first bearing housing 60 and the second bearing housing 70, respectively.

[0034] (supply pipe) The supply pipe 80 is positioned to supply lubricating oil to the first bearing 24 and the second bearing 34. The supply pipe 80 is formed so that lubricating oil can flow through its interior. In this embodiment, at least a portion of the supply pipe 80 is positioned inside the casing 50, and a pair of supply pipes are provided so as to sandwich the main gear 12, the first auxiliary gear 22, and the second auxiliary gear 32 in the first direction D1. The supply pipe 80 is positioned so as not to interfere with the parts that are driven. The supply pipe 80 comprises a main supply pipe portion 82 and branch portions 84.

[0035] The main supply pipe 82 is positioned extending in the second direction D2. The main supply pipe 82 is capable of supplying lubricating oil from the first side D2a to the second side D2b in the second direction D2 by a pumping device (not shown). That is, the supply pipe 80 in this embodiment is formed to supply lubricating oil by branching it into two from the pumping device. The branch section 84 is formed to branch out from the main supply pipe 82 toward the first direction D1. The branch section 84 is inserted into the first bearing housing 60 or the second bearing housing 70, and is capable of supplying lubricating oil to the first bearing 24 or the second bearing 34.

[0036] <Effects and Effects> As a comparative example of the geared compressor 1 described above, a geared compressor 1c as shown in Figure 4 will be explained. The geared compressor 1c of the comparative example differs from the geared compressor 1 of the embodiment in the configuration of the casing 50c through which the drive shaft 10, the first shaft 20, and the second shaft 30c pass. In the casing 50c of the comparative example, the portion through which the drive shaft 10, the first shaft 20, and the second shaft 30c pass is a single bearing housing 60c. The bearing housing 60c is formed with a constant thickness in the first direction D1. Furthermore, the bearing housing 60c is formed to match the thickness of the first bearing 24 in the first direction D1, to be approximately the same as the first bearing 24. In other words, the bearing housing 60c is the first bearing housing 60 of the embodiment extended in the second direction D2.

[0037] In the comparative example, the second bearing 34 is fixed to the central portion of the bearing housing 60c in the first direction. Therefore, in the first direction, the distance between the pair of first bearings 24 and the distance between the pair of second bearings 34 are the same. Also, in the comparative example, the second shaft 30c is formed to have the same length as the first shaft 20 in the first direction. Furthermore, the supply pipe 80c in the comparative example is a hole formed in the bearing housing 60c near the first bearing 24 and the second bearing 34, respectively. That is, in the comparative example, it is configured to supply lubricating oil from the pumping equipment in four separate branches.

[0038] In the geared compressor 1 of this embodiment, the first shaft 20 and the second shaft 30 are supported by a first bearing 24 and a second bearing 34, respectively, which are fixed to a first bearing housing 60 and a second bearing housing 70, which are separate components. The casing side plate 52 is formed to be thinner in the first direction D1 than the first bearing housing 60 and the second bearing housing 70. The second bearing housing 70 is formed to be thinner in the first direction D1 than the first bearing housing 60. With this configuration, the casing 50 is configured to have the necessary rigidity to support the first shaft 20 and the second shaft 30, respectively. In other words, the casing 50 is adjusted to the minimum thickness necessary to support the first shaft 20 and the second shaft 30, respectively.

[0039] Specifically, the first bearing housing 60 is formed to be thicker in the first direction D1 than the second bearing housing 70. This allows for stable support of the first shaft 20, which has a larger diameter than the second shaft 30. In other words, the casing 50 can be constructed without making the second bearing housing 70 unnecessarily thick. Furthermore, the casing side plate 52 is formed to be thinner in the first direction D1 than the first bearing housing 60 and the second bearing housing 70. This allows for stable support of the first shaft 20 and the second shaft 30, and also reduces the overall weight of the casing 50. Therefore, the weight of the geared compressor 1 can be further reduced.

[0040] In other words, compared to the comparative example geared compressor 1c, the geared compressor 1 of this embodiment has improved design flexibility for the casing 50 by separating the first bearing housing 60 and the second bearing housing 70. Furthermore, by separating the first bearing housing 60 and the second bearing housing 70, the overall weight of the casing 50 can be reduced. Reducing the weight of the geared compressor 1 (casing 50) offers advantages such as reduced manufacturing costs and reduced transportation costs.

[0041] Furthermore, the spacing between the pair of inner surfaces 62 of the first housing is equal to the spacing between the pair of inner surfaces 72 of the second housing, while the spacing between the pair of outer surfaces 64 of the first housing is greater than the spacing between the pair of outer surfaces 74 of the second housing. As a result, the first bearing housing 60 and the second bearing housing 70 are arranged at the same spacing inside the casing 50. Therefore, the thickness of the first bearing housing 60 and the second bearing housing 70 can be changed without changing (increasing) the internal space of the casing 50. In other words, the overall weight of the casing 50 can be reduced while keeping the size of the internal space of the casing 50 constant. In addition, the design freedom of the casing 50 can be improved.

[0042] Furthermore, the casing 50 of this embodiment has a bearing support portion 54 that is fixed to the casing side plate 52 and extends vertically (third direction D3), supporting the first bearing housing 60 and the second bearing housing 70 from below in the vertical direction. As a result, the first bearing housing 60 and the second bearing housing 70 are supported from below in the vertical direction by the bearing support portion 54. The bearing support portion 54 is adjusted to the required size according to the first bearing housing 60 and the second bearing housing 70, respectively. Therefore, sufficient rigidity can be obtained to stably support the first bearing 24 and the second bearing 34 while keeping the thickness of the casing side plate 52 down. Consequently, the first shaft 20 and the second shaft 30 can be supported more stably while keeping the overall weight of the casing 50 down.

[0043] Furthermore, in this embodiment, the second impeller 36 fixed to the second shaft 30 is configured to compress fluids at a higher pressure than the first impeller 26 fixed to the first shaft 20. The relationship between the first bearing span L1 and the second bearing span L2 is such that L2 / L1 is less than 1. In this case, the first bearing housing 60 and the second bearing housing 70 are formed to the required thickness for the first shaft 20 and the second shaft 30, respectively, without changing (increasing) the internal space of the casing 50. Therefore, the second shaft 30 can be formed shorter than the first shaft 20. With this configuration, the weight of the casing 50 can be reduced, and the second bearing span L2 can be shortened, thereby increasing the eigenvalue of the rotor of the second shaft 30. Therefore, the second shaft 30 can rotate at a higher speed, and the performance of the impeller can be improved. Thus, the compression performance can be improved while reducing the weight of the geared compressor 1.

[0044] Furthermore, according to the configuration of the supply pipe 80 of this embodiment, lubricating oil can be supplied to the first bearing 24 and the second bearing 34 by branching from the main supply pipe 82 to the branch section 84. This allows for the supply of lubricating oil with fewer branches in the piping from the pressurized equipment compared to the configuration of the supply pipe 80c of the comparative example. In other words, according to this embodiment, the configuration of piping and other components related to the pressurized equipment for supplying lubricating oil can be simplified. In addition, according to this embodiment, lubricating oil can be supplied to the first bearing 24 and the second bearing 34 without creating a hole that penetrates the casing 50 in the second direction D2. Therefore, the design freedom of the casing 50 can be improved while maintaining the rigidity of the casing 50.

[0045] <Other Embodiments> Although embodiments of this disclosure have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments and may include design changes and the like that do not depart from the gist of this disclosure.

[0046] For example, the geared compressor 1 in this embodiment is a two-shaft, four-stage centrifugal compressor, but it is not limited to this. Specifically, the geared compressor may be a three-shaft, five-stage or more compressor.

[0047] Furthermore, while the casing 50 in this embodiment is divisible into an upper casing 50A and a lower casing 50B, it is not limited to this. For example, the casing 50 may be further subdivided.

[0048] <Note> The geared compressor 1 described in the embodiment can be understood, for example, as follows:

[0049] (1) The geared compressor 1 according to the first embodiment includes a drive shaft 10 that extends around an axis O extending in a first direction D1 and is rotationally driven around the axis O, a main gear 12 fixed to the drive shaft 10 and rotating together with the drive shaft 10 around the axis O, a first sub-gear 22 that meshes with the main gear 12 and rotates, a second sub-gear 32 that is positioned on the opposite side of the first sub-gear 22 with respect to the main gear 12 in a second direction D2 intersecting the first direction D1 and meshes with the main gear 12 and rotates, a first shaft 20 fixed to the first sub-gear 22 and extending in the first direction D1, a second shaft 30 fixed to the second sub-gear 32 and extending in the first direction D1, a pair of first bearings 24 that rotatably support the first shaft 20 and are spaced apart in the first direction D1, and the second shaft 30 that rotatably supports The system comprises a pair of second bearings 34 spaced apart in the first direction D1, a casing 50 housing the main gear 12, the first auxiliary gear 22, and the second auxiliary gear 32, wherein the casing 50 has a casing side plate 52 extending in a plane intersecting the first direction D1, a pair of first bearing housings 60 fixed to the casing side plate 52 and each fixing the pair of first bearings 24, and a pair of second bearing housings 70 fixed to the casing side plate 52 and each fixing the pair of second bearings 34, wherein the casing side plate 52 is formed to be thinner in the direction of the first direction D1 than the first bearing housing 60 and the second bearing housing 70, and the second bearing housing 70 is formed to be thinner in the direction of the first direction D1 than the first bearing housing 60.

[0050] In this geared compressor 1, the first shaft 20 and the second shaft 30 are supported by a first bearing 24 and a second bearing 34, respectively, which are provided in a first bearing housing 60 and a second bearing housing 70, which are separate components. The casing side plate 52 is formed to be thinner in the first direction D1 than the first bearing housing 60 and the second bearing housing 70. This allows for stable support of the first shaft 20 and the second shaft 30, while also reducing the overall weight of the casing 50. Therefore, the weight of the geared compressor 1 can be further reduced.

[0051] (2) The geared compressor 1 relating to the second embodiment is the geared compressor 1 of (1), wherein in a pair of first bearing housings 60, the distance between a pair of first housing inner surfaces 62 facing inward in the first direction D1 is equal to the distance between a pair of second housing inner surfaces 72 facing inward in the first direction D1 in a pair of second bearing housings 70, and in a pair of first bearing housings 60, the distance between a pair of first housing outer surfaces 64 facing outward in the first direction D1 is greater than the distance between a pair of second housing outer surfaces 74 facing outward in the first direction D1 in a pair of second bearing housings 70.

[0052] In this geared compressor 1, the first bearing housing 60 and the second bearing housing 70 are arranged at the same distance from each other inside the casing 50. Therefore, the thickness of the first bearing housing 60 and the second bearing housing 70 can be changed without increasing the internal space of the casing 50.

[0053] (3) The geared compressor 1 relating to the third embodiment is the geared compressor 1 of (1) or (2), wherein the casing 50 is fixed to the casing side plate 52 and extends vertically, and has a bearing support portion 54 that supports the first bearing housing 60 and the second bearing housing 70 from below in the vertical direction.

[0054] In this geared compressor 1, the first bearing housing 60 and the second bearing housing 70 are supported vertically from below by the bearing support portion 54. Therefore, sufficient rigidity can be obtained while keeping the thickness of the casing side plate 52 low.

[0055] (4) The geared compressor 1 relating to the fourth aspect is the geared compressor 1 of (1) to (3), wherein the first shaft 20 has first impellers 26 fixed to both ends in the first direction D1, and the second shaft 30 has second impellers 36 fixed to both ends in the first direction D1 for compressing fluid at a higher pressure than the first impellers 26.

[0056] In this geared compressor 1, the first bearing housing 60 and the second bearing housing 70 are formed and arranged to the required thickness for the first shaft 20 and the second shaft 30, respectively. Therefore, the overall weight of the casing 50 can be reduced while ensuring sufficient rigidity. [Explanation of Symbols]

[0057] 1... Geared compressor 10…Drive shaft 12…Main gear 20…First axis 22...First auxiliary gear 24...First bearing 26...First impeller 30…Second axis 32...Second auxiliary gear 34…Second bearing 36... Second impeller 50…Casing 50A... Upper casing 50B...Lower casing 52…Casing side plate 53...occlusion plate 54...Bearing support part 56…Bottom plate 60…First bearing housing 62...Interior of the first housing 64…First Housing Exterior 70...Second bearing housing 72...Interior of the second housing 74…Exterior of the second housing 80…Supply pipe 82... Main supply pipe section 84... Branch L1…First bearing span L2...Second bearing span O…Axis line O1…first center line O2…Second center line D1…first direction D1a...One side D1b...the other side D2…Second direction D2a…first side D2b…Second side D3...Third direction

Claims

1. A drive shaft extending around an axis extending in a first direction and rotated around the said axis, A main gear fixed to the drive shaft and rotating together with the drive shaft around the axis, A first auxiliary gear that meshes with the main gear and rotates, A second auxiliary gear is positioned in a second direction intersecting the first direction, on the opposite side of the front first auxiliary gear with respect to the main gear, and rotates in mesh with the main gear, A first shaft fixed to the first auxiliary gear and extending in the first direction, A second shaft fixed to the second auxiliary gear and extending in the first direction, The first shaft is rotatably supported by a pair of first bearings arranged apart in the first direction, The second shaft is rotatably supported by a pair of second bearings arranged apart in the first direction, A casing that houses the main gear, the first auxiliary gear, and the second auxiliary gear inside, Equipped with, The casing is, A casing side plate extending across the surface intersecting the first direction, A pair of first bearing housings, fixed to the casing side plate and each fixing a pair of the first bearings, A pair of second bearing housings, fixed to the casing side plate and each fixing a pair of the second bearings, It has, The casing side plate is formed to be thinner in the first direction than the first bearing housing and the second bearing housing. The second bearing housing is formed to be thinner in the first direction than the first bearing housing. Geared compressor.

2. In a pair of first bearing housings, the distance between the inner surfaces of the pair of first housings facing inward in the first direction is equal to the distance between the inner surfaces of the pair of second housings facing inward in the pair of second bearing housings. In a pair of first bearing housings, the distance between the pair of outer surfaces of the first housings facing outward in the first direction is greater than the distance between the pair of outer surfaces of the second housings facing outward in the first direction in a pair of second bearing housings. The geared compressor according to claim 1.

3. The casing has bearing support portions that are fixed to the casing side plate and extend vertically, and that support the first bearing housing and the second bearing housing from below in the vertical direction. A geared compressor according to claim 1 or 2.

4. The first shaft has first impellers fixed to both ends in the first direction. The second shaft has second impellers fixed to both ends in the first direction, which compress fluid at a higher pressure than the first impeller. A geared compressor according to claim 1 or 2.

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