Method for removing shaft support mechanism, rotating machinery, and bearings

Abstract

To provide a support mechanism for supporting a shaft when removing a bearing which rotatably supports the shaft of a rotor in a rotating machine, and a rotating machine.SOLUTION: A support mechanism for supporting a shaft 50 when removing bearings 8, 9 from a rotating machine 1 comprises: a ring-shaped first support material 3 and a ring-shaped second support material 4 which are arranged with a clearance around the shaft 50 at a first position on the inside of a first side lid 21 and the inside of a second side lid 22; first moving means 10 for moving the first support material 3 along an axial direction of the shaft 50 and bringing the first support material 3 to a rest at the moved position; and second moving means 11 for moving the second support material 4 along the axial direction, and bringing the second support material 4 to a rest at the moved position. The first support material 3 and the second support material 4 include support parts 31, 41 which makes contact with an external peripheral surface of a portion 500 of the shaft 50 on their internal peripheral surfaces to support the shaft 50 at a second position further away from the side lids 21, 22 than the first position.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a support mechanism for supporting a shaft when removing a bearing that rotatably supports the shaft of a rotor in a rotating machine, a rotating machine provided with the support mechanism, and a method for removing a bearing from the rotating machine.

Background Art

[0002] For example, in various rotating machines such as compressors, steam turbines, generators, blowers, electric motors, drive motors, actuators, and machine tools, the shaft of the rotor is rotatably supported by a pair of bearings. The rotor is housed in a cylindrical casing, and bearings are respectively attached to a pair of side covers at both ends of the casing.

[0003] Bearings may be damaged when the usage time exceeds a certain period, and the lubricating grease gradually deteriorates, resulting in a decrease in lubricating ability. Therefore, it is necessary to perform regular maintenance and replace the bearings.

[0004] During maintenance, it is common to remove one side cover from the casing, pull out the shaft together with the side cover from the casing, and then remove the bearing from the shaft (see the background art of Patent Document 1).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, the method described above requires considerable effort and time to remove the shaft from the casing. Furthermore, when removing the bearing from the shaft, if the shaft remains horizontal, the weight of the shaft and impeller may cause the shaft to wobble, potentially damaging the sealing mechanism located near the bearing. Therefore, it is necessary to rotate the shaft so that its orientation is vertical and then set it aside, which also requires considerable effort and time to remove the bearing.

[0007] The present invention has been made with a focus on solving the above problems, and aims to provide a support mechanism for supporting a shaft when removing a bearing that rotatably supports the shaft of a rotor in a rotating machine, a rotating machine equipped with the support mechanism, and a method for removing the bearing from the rotating machine. [Means for solving the problem]

[0008] To solve the above problems, the present invention focuses on the support mechanism described in Section 1 below.

[0009] Item 1. A support mechanism for supporting the shaft when removing the bearings in a rotating machine comprising a cylindrical casing, a rotor housed in the casing, and a pair of bearings that rotatably support the shaft of the rotor, A ring-shaped first support member is positioned at a first location inside one end of the casing, with a gap around the shaft, A ring-shaped second support member is positioned at a first location inside the other end of the casing, with a gap around the shaft, A first moving means moves the first support member along the axial direction of the shaft and keeps the first support member stationary at the moved position, A second moving means for moving the second support member along the axial direction of the shaft and for keeping the second support member stationary at the moved position, Equipped with, A support mechanism comprising the first support member and the second support member, each including a support portion in which the inner circumferential surface of the first support member contacts the outer circumferential surface of a portion of the shaft at a second position further from the end of the casing than the first position, thereby supporting the shaft.

[0010] Furthermore, the support mechanism of the present invention includes, as a preferred embodiment of the support mechanism described in item 1 above, the support mechanism described in item 2 below.

[0011] Item 2. The support mechanism according to Item 1, wherein the inner circumferential surface of the support portion gradually widens in diameter toward the inside, and the portion of the shaft that the support portion contacts at the second position has an outer circumferential surface that gradually narrows in diameter toward the end of the shaft.

[0012] Furthermore, the support mechanism of the present invention includes, as a preferred embodiment of the support mechanisms described in items 1 and 2 above, the support mechanism described in item 3 below.

[0013] Item 3. The first support member and the second support member each have at least one screw hole formed therein. At least one bolt insertion hole is formed at each end of the casing, communicating with the screw hole. The first moving means and the second moving means are, A bolt having a head that fits into the bolt insertion hole and a threaded portion on the opposite side of the head that passes through the bolt insertion hole and is screwed into the threaded hole, At least one restricting member that prevents the head of the bolt from coming out of the bolt insertion hole, A support mechanism according to item 1 or 2, comprising the following:

[0014] Furthermore, the support mechanism of the present invention includes, as a preferred embodiment of the support mechanism described in item 3 above, the support mechanism described in item 4 below.

[0015] Item 4. A polygonal hole is formed in the head of the bolt. A polygonal hole is formed in the head of the bolt. The regulating material is a plate material attached to the end of the casing so as to cover the head of the bolt, and an opening for exposing the hole of the head of the bolt is formed in the plate material. The support mechanism according to claim 3.

[0016] The support mechanism of the present invention includes, as a preferred aspect of the support mechanisms described in Items 1 and 2 above, the support mechanism described in Item 5 below.

[0017] Item 5. The first moving means and the second moving means each a male screw formed on the outer peripheral surface of the first support material and the second support material, a screw hole formed at the end of the casing and having a female screw that engages with the male screw, The support mechanism according to claim 1 or 2, which is composed of

[0018] Further, the present invention is directed to a rotating machine described in Item 6 below in order to solve the above problems.

[0019] Item 6. A cylindrical casing, a rotor housed in the casing, a pair of bearings that rotatably support the shaft of the rotor, a first housing that houses one of the pair of bearings and is attached to one end of the casing, a second housing that houses the other of the pair of bearings and is attached to the other end of the casing, the support mechanism according to any one of claims 1 to 5 that supports the shaft when removing the pair of bearings, and A rotating machine comprising

[0020] Further, the present invention is directed to a support mechanism described in Item 7 below in order to solve the above problems.

[0021] Item 7. A method for removing a bearing in a rotating machine comprising a cylindrical casing, a rotor housed in the casing, a pair of bearings that rotatably support the shaft of the rotor, a first housing that houses one of the pair of bearings and is attached to one end of the casing, and a second housing that houses the other of the pair of bearings and is attached to the other end of the casing, A step of moving a ring-shaped first support member, which is positioned at a first position on the inside of one end of the casing with a gap around the shaft, to a second position in the direction away from the one end along the axial direction of the shaft, and supporting a portion of the shaft by a support portion of the first support member, the inner surface of which contacts the outer surface of a portion of the shaft at the second position, A step of moving a ring-shaped second support member, which is positioned at a first position inside the other end of the casing with a gap around the shaft, to a second position along the axial direction of the shaft in a direction away from the other end, and supporting the other part of the shaft with a support portion of the second support member in which the inner surface contacts the outer surface of the other part of the shaft at the second position, With the shaft supported by the support portion of the first support member and the support portion of the second support member, and the shaft kept horizontal, the first housing and the second housing are removed from the casing. A method of having. [Effects of the Invention]

[0022] According to the present invention, the shaft can be supported when removing the bearing that rotatably supports the rotor shaft in a rotating machine. Therefore, when performing maintenance work, the shaft is held in a horizontal position, so the bearing can be removed without pulling the shaft out of the casing, and bearing replacement work can be easily performed. [Brief explanation of the drawing]

[0023] [Figure 1]This is a cross-sectional view of a rotating machine. [Figure 2] This is a cross-sectional view showing an enlarged portion of Figure 1. [Figure 3] This is a cross-sectional view showing an enlarged portion of Figure 2. [Figure 4] This is a cross-sectional view showing an enlarged portion of another part of Figure 1. [Figure 5] This is a cross-sectional view showing an enlarged portion of Figure 4. [Figure 6] This is a front view of the regulated material. [Modes for carrying out the invention]

[0024] Embodiments of the present invention will be described below with reference to the accompanying drawings. The support mechanism of the present invention can be applied to various rotating machines such as compressors, steam turbines, generators, blowers, electric motors, drive machines, actuators, and machine tools. The following embodiments will be described using an example in which the support mechanism of the present invention is incorporated into a vacuum vapor compressor (heat pump device) of an evaporative concentrator as a rotating machine.

[0025] Figure 1 shows the internal structure of a rotating machine 1 equipped with the support mechanism of this embodiment. The rotating machine 1 comprises at least a cylindrical casing 2, a rotor 5 housed in the casing 2, a first housing 6 attached to one end of the casing 2 in the axial direction (first side cover 21), a first bearing 8 housed in the first housing 6, a second housing 7 attached to the other end of the casing 2 in the axial direction (second side cover 22), a second bearing 9 housed in the second housing 7, a ring-shaped first support member 3 positioned inside the first side cover 21 around the shaft 50 of the rotor 5, a ring-shaped second support member 4 positioned inside the second side cover 22 around the shaft 50 of the rotor 5, a first moving means 10 for moving the first support member 3 along the axial direction of the shaft 50, and a second moving means 11 for moving the second support member 4 along the axial direction of the shaft 50. The shaft 50 is rotatably supported at one end in the axial direction (hereinafter referred to as "one end of the shaft 50") by a first bearing 8, and at the other end in the axial direction (hereinafter referred to as "the other end of the shaft 50") by a second bearing 9.

[0026] The following describes the various components that primarily make up the rotating machine 1.

[0027] First, as shown in Figure 1, the casing 2 is, for example, cylindrical. The casing 2 includes a main body 20, a first side cover 21 that covers one opening of the main body 20 in the axial direction, and a second side cover 22 that covers the other opening of the main body 20 in the axial direction. In this embodiment, the casing 2 is provided with a steam introduction section 23 on the second side cover 22, and a steam outlet section is provided at an appropriate position to discharge the high-pressure steam, which has been compressed from the steam supplied into the casing 2, to the outside of the casing 2.

[0028] The main body 20 has an internal space that houses a plurality of impellers 51 integrally provided on the central part of the shaft 50 of the rotor 5 and on the outer circumferential surface of the central part. The first side cover 21 and the second side cover 22 each form the ends of the casing 2 and close the internal space. In this embodiment, the first side cover 21 and the second side cover 22 are detachably attached to the main body 20. The first side cover 21 and the second side cover 22 can be detachably fixed to the main body 20, for example, using bolts.

[0029] The central part of the first side cover 21 is recessed. The central part of the shaft 50 passes through the central part 210 of the first side cover 21, which is located in this recess, and one end of the shaft 50 protrudes to the outside of the first side cover 21. Note that "outside" refers to the side of the first side cover 21 that is opposite to the internal space of the main body 20. The recess of the first side cover 21 is covered by the cover 13.

[0030] A first shaft sealing mechanism 16 is attached to the central portion 210 of the first side cover 21 on its outer surface to seal the gap formed between the shaft 50 and the first side cover 21. The first shaft sealing mechanism 16 can be a conventional structure known for use in this type of device, and examples include dry seals, double dry seals, and double mechanical seals.

[0031] As shown in Figures 2 and 3, in this embodiment, a recessed area 212 is formed on the inner surface of the central portion 210 of the first side cover 21. In addition, in this embodiment, at least one, preferably multiple, bolt insertion holes 211 are formed in the central portion 210 of the first side cover 21 at a position passing through the recess 212. The multiple bolt insertion holes 211 are preferably formed in the central portion 210 of the first side cover 21 so as to be positioned at predetermined intervals on the circumference of a desired virtual circle.

[0032] As shown in Figure 1, the central part of the shaft 50 passes through the second side cover 22 in its central portion 220, with the other end of the shaft 50 protruding to the outside of the second side cover 22. "Outside" refers to the side of the second side cover 22 that is opposite to the internal space of the main body 20.

[0033] A second shaft sealing mechanism 17 is attached to the central portion 220 of the second side cover 22 on its outer surface to seal the gap formed between the shaft 50 and the second side cover 22. The second shaft sealing mechanism 17 can be a conventional structure known for use in this type of device, and examples include dry seals, double dry seals, and double mechanical seals.

[0034] As shown in Figures 4 and 5, in this embodiment, a recessed area 222 is formed on the inner surface of the central portion 220 of the second side cover 22. In addition, in this embodiment, at least one, preferably multiple, bolt insertion holes 221 are formed in the central portion 220 of the second side cover 22 at a position passing through the recess 222. The multiple bolt insertion holes 221 are preferably formed in the central portion 220 of the second side cover 22 so as to be positioned at predetermined intervals on the circumference of a desired virtual circle.

[0035] The central portion 210 of the first side cover 21 and the central portion 220 of the second side cover 22 are not particularly limited, but they may be removable from other parts of the first side cover 21 and other parts of the second side cover 22, respectively.

[0036] Next, as shown in Figure 1, the rotor 5 rotates within the casing 2 with the motor as the driving source. The rotor 5 includes a shaft 50, which is the axis of rotation. The shaft 50 is a circular rod and includes a large-diameter central part and small-diameter ends.

[0037] The central part of the shaft 50 has multiple impellers 51 projecting outwards at intervals along the axial direction. The central part of the shaft 50 may be formed with the same outer diameter along its entire axial length, but in this embodiment, as shown in Figures 2 and 3, a portion of both ends in the axial direction is formed in a tapered shape, becoming narrower (the outer diameter decreases) towards the end. The tapered portion of the central part of the shaft 50 is referred to as the tapered portion 500.

[0038] As shown in Figure 1, one end of the shaft 50 is rotatably supported by a first bearing 8 housed in the first housing 6. The other end of the shaft 50 penetrates the first housing 6 and protrudes to the outside of the first housing 6, and a balance disc 12 is detachably attached to the other end of the shaft 50. Note that "outside" refers to the side of the first housing 6 opposite to the first side cover 21.

[0039] The other end of the shaft 50 is rotatably supported by a second bearing 9 housed in the second housing 7. The other end of the shaft 50 penetrates the second housing 7 and protrudes to the outside of the second housing 7, and the portion of the other end of the shaft 50 that protrudes from the second housing 7 is connected to the motor via a coupling or pulley. In this embodiment, the protruding portion of the other end of the shaft 50 is connected to the motor via a pulley 14. Note that "outside" refers to the side of the second housing 7 opposite to the second side cover 22.

[0040] Next, as shown in Figure 1, the first housing 6 is detachably attached to the central portion 210 of the first side cover 21 on the outside of the first shaft sealing mechanism 16. The first housing 6 can be detachably fixed to the central portion 210 of the first side cover 21, for example, using bolts 15. The first bearing 8 is housed in the central portion of the first housing 6. The shape and structure of the first housing 6 are not particularly limited, as long as the first housing 6 can be attached to the first side cover 21 and can accommodate the first bearing 8.

[0041] Next, as shown in Figure 1, the second housing 7 is detachably attached to the central portion 220 of the second side cover 22 on the outside of the second shaft sealing mechanism 17. The second housing 7 can be detachably fixed to the central portion 220 of the second side cover 22, for example, using bolts 15. The second bearing 9 is housed in the central portion of the second housing 7. The shape and structure of the second housing 7 are not particularly limited, as long as the second housing 7 can be attached to the second side cover 22 and the second bearing 9 can be housed there.

[0042] Next, as shown in Figure 1, the first bearing 8 and the second bearing 9 are not particularly limited as long as they can rotatably support the ends of the shaft 50, respectively. The first bearing 8 and the second bearing 9 can be conventionally known types such as ball bearings, roller bearings, plain bearings, or angular bearings.

[0043] Next, as shown in Figures 1 to 5, the first support member 3 and the second support member 4 are disc-shaped and smaller in size than the central portion 210 of the first side lid 21 and the central portion 220 of the second side lid 22, respectively. Normally, as shown in Figures 3(A) and 4(A), the first support member 3 and the second support member 4 are positioned inside the first side lid 21 and the second side lid 22, respectively, in a position close to the first side lid 21 and the second side lid 22, preferably adjacent to them. This position is referred to as the "first position".

[0044] In this embodiment, the outer diameter of the first support member 3 and the second support member 4 are slightly smaller than the inner diameter of the recess 212 of the first side cover 21 and the inner diameter of the recess 222 of the second side cover 22, respectively, and the thickness of the first support member 3 and the second support member 4 are greater than the depth of the recess 212 of the first side cover 21 and the depth of the recess 222 of the second side cover 22. Therefore, a portion of the first support member 3 and a portion of the second support member 4 are fitted into the recess 212 of the first side cover 21 and the recess 222 of the second side cover 22, respectively. Thus, in this embodiment, the first support member 3 and the second support member 4 are normally fitted into the recess of the first side cover 21 and the recess of the second side cover 22, respectively, in their first positions, and remain stationary with a gap around the central part of the shaft 50.

[0045] The diameter of the central opening 30 of the first support member 3 and the diameter of the central opening 40 of the second support member 4 are slightly larger than the outer diameter of the portion 501 of the shaft 50 that is closer to the end of the shaft 50 than the tapered portion 500 in the central part of the shaft 50. Therefore, when the first support member 3 and the second support member 4 are in the first position, they do not come into contact with the shaft 50 when the shaft 50 rotates, and do not interfere with the rotation of the shaft 50. In addition, the first support member 3 and the second support member 4 can move smoothly and frictionlessly with the shaft 50 when they move inward along the axial direction of the shaft 50 from the first position.

[0046] The openings 30 of the first support member 3 and 40 of the second support member 4 may be formed with the same diameter along their entire axial length. However, in this embodiment, as shown in Figures 3 and 5, a portion of each is tapered inward (on the side opposite to the first side cover 21 and the second side cover 22, respectively), widening towards the inside (the inner circumferential surface of the first support member 3 and the inner circumferential surface of the second support member 4 widens in diameter). In the first support member 3 and the second support member 4, the tapered portions of the openings 30 and 40 are referred to as support portions 31 and 41, respectively.

[0047] The inclination angle of the inner circumferential surfaces of the support parts 31 and 41 with respect to the axial direction is equal to or approximately equal to the inclination angle of the outer circumferential surface of the tapered portion 500 of the shaft 50 with respect to the axial direction. Therefore, when the first support member 3 and the second support member 4 move inward along the axial direction of the shaft 50 from their respective first positions, the tapered portion 500 of the shaft 50 fits into the support part 31 of the first support member 3 and the support part 41 of the second support member 4, respectively, as shown in Figures 3(B) and 4(B), and the inner circumferential surfaces of both support parts 31 and 41 and the outer circumferential surface of the tapered portion 500 come into close contact. The position where the first support member 3 and the second support member 4 each come into contact with the tapered portion 500 of the shaft 50 is referred to as the "second position". The second position is further from the first side cover 21 and the second side cover 22 than the first position.

[0048] As shown in Figures 2 to 5, the first support member 3 and the second support member 4 each have at least one screw hole 32, 42. The screw holes 32, 42 are formed in the first support member 3 and the second support member 4 at positions that communicate with the bolt insertion hole 211 of the first side cover 21 and the bolt insertion hole 221 of the second side cover 22, respectively. In this embodiment, multiple screw holes 32, 42 are formed in the first support member 3 and the second support member 4 at predetermined intervals on the circumference of a desired virtual circle.

[0049] Next, as shown in Figures 1 to 5, the first moving means 10 moves the first support member 3 along the axial direction of the shaft 50 between the first and second positions described above, and then stops the first support member 3 at the moved position. The second moving means 11 also moves the second support member 4 along the axial direction of the shaft 50 between the first and second positions described above, and then stops the second support member 4 at the moved position. "Stationary" means that the first support member 3 and the second support member 4 do not move along the axial direction of the shaft 50, nor do they move in a direction perpendicular to the axial direction, and remain fixed around the shaft 50.

[0050] In this embodiment, the first moving means 10 and the second moving means 11 are each composed of bolts 100 and 110 and restricting members 101 and 111.

[0051] The heads of the bolts 100 and 110 are housed in the bolt insertion holes 211 of the first side cover 21 and 221 of the second side cover 22, respectively, and the threaded ends opposite the heads pass through the bolt insertion holes 211 and 221 and are screwed into the threaded holes 32 of the first support member 3 and 42 of the second support member 4. The bolt insertion holes 211 and 221 are designed so that the heads of the bolts 100 and 110 do not pass through them.

[0052] As shown in Figure 6, the heads of bolts 100 and 110 have polygonal holes 103 and 113, such as hexagonal ones, respectively. The bolts 100 and 110 can be rotated within the bolt insertion holes 211 and 221 using a hex wrench or the like.

[0053] As shown in Figures 2 to 6, the restricting members 101 and 111 prevent the heads of the bolts 100 and 110 from coming out of the bolt insertion holes 211 and 221, respectively. The restricting members 101 and 111 are plate materials that are attached to the outer surfaces of the first side cover 21 and the second side cover 22, respectively, so as to cover the heads of the bolts 100 and 110. The restricting members 101 and 111 can be detachably fixed to the first side cover 21 and the second side cover 22, for example, using bolts 102 and 112, but they may also be fixed using adhesive or the like.

[0054] The restricting members 101 and 111 each have openings 104 and 114 that are smaller in size than the heads of the bolts 100 and 110, and that expose the holes 103 and 113 of the bolt heads 100 and 110.

[0055] Next, the procedure for removing a pair of bearings 8 and 9 for maintenance in the rotating machine 1 with the above configuration will be described.

[0056] First, on the first bearing 8 side, the cover 13 is removed from the first side lid 21 of the casing 2, and a hex wrench or similar tool is engaged with the hole 103 in the head of the bolt 100 through the opening 60 (shown in Figure 2) formed in the first housing 6. Then, the bolt 100 is turned in the loosening direction using the hex wrench or similar tool. As a result, the bolt 100 attempts to move in the direction of coming out of the screw hole 32 of the first support member 3, but the head of the bolt 100 is prevented from coming out of the bolt insertion hole 211 of the first side lid 21 by the restricting member 101, so as shown in Figure 3(A), the first support member 3 moves inward away from the first side lid 21. At this time, the first support member 3 moves along the axial direction of the shaft 50 while being held by the first side lid 21 of the casing 2 via the bolt 100 of the first moving means 10.

[0057] Then, by continuing to turn the bolt 100 in the loosening direction, the first support member 3 is moved inward to a second position where the support portion 31 of the first support member 3 contacts the tapered portion 500 of the shaft 50, as shown in Figure 3(B). In this way, the shaft 50 is supported by the first support member 3.

[0058] Next, on the second bearing 9 side, similar to the first bearing 8 side, a hex wrench or similar tool is engaged with the hole 113 in the head of the bolt 110 through the opening 70 (shown in Figure 4) formed in the second housing 7. Then, the bolt 110 is turned in the loosening direction using the hex wrench or similar tool. As a result, the bolt 110 attempts to move in the direction of coming out of the screw hole 42 of the second support member 4, but the head of the bolt 110 is prevented from coming out of the bolt insertion hole 221 of the second side cover 22 by the restricting member 111. Therefore, as shown in Figure 5(A), the second support member 4 moves inward, away from the second side cover 22. At this time, the second support member 4 moves along the axial direction of the shaft 50 while being held by the second side cover 22 of the casing 2 via the bolt 110 of the second moving means 11.

[0059] Then, by continuing to turn the bolt 110 in the loosening direction, the second support member 4 is moved inward to a second position where the support portion 41 of the second support member 4 contacts the tapered portion 500 of the shaft 50, as shown in Figure 5(B). In this way, the shaft 50 is supported by the second support member 4.

[0060] In this way, by supporting the shaft 50 with a pair of support members 3 and 4, the shaft 50 can be held in a horizontal position instead of the pair of bearings 8 and 9.

[0061] Then, the bolt 15 is loosened and the first housing 6 containing the first bearing 8 is removed from the first side cover 21, and the second housing 7 containing the second bearing 9 is removed from the second side cover 22. This allows the pair of bearings 8 and 9 to be removed from the rotating machine 1.

[0062] According to the rotating machine 1 equipped with the support mechanism of this embodiment, when removing the pair of bearings 8 and 9, it is not necessary to pull the shaft 50 out of the casing 2, and since the shaft 50 is held horizontally, maintenance work such as bearing replacement can be easily performed.

[0063] Furthermore, according to the rotating machine 1 equipped with the support mechanism of this embodiment, the support portion 31 of the first support member 3 and the support portion 41 of the second support member 4 have inclined inner surfaces, and the tapered portion 50 of the shaft 5 that the support portions 31 and 41 contact also has an inclined outer surface that matches the inclination of the support portion 41. Therefore, the pair of support members 3 and 4 can support the shaft 50 in a balanced manner.

[0064] The support mechanism and rotating machine 1 of this embodiment have been described above, but the above embodiment is merely illustrative and not restrictive. Therefore, the present invention is not limited to the above embodiment, and various modifications are possible as long as they do not depart from the spirit of the invention.

[0065] For example, in the above embodiment, the inner circumferential surface of the support portion 31 of the first support member 3 and the inner circumferential surface of the support portion 41 of the second support member 4 are tapered inclined surfaces, and the outer circumferential surface of the portion of the shaft 50 that comes into contact with the inner circumferential surfaces of the support portions 31 and 41 (the tapered portion 50 in the above embodiment) is also a tapered inclined surface. However, the shape of the inner circumferential surfaces of the support portions 31 and 41 and the outer circumferential surface of the portion of the shaft 5 that comes into contact with the inner circumferential surfaces of the support portions 31 and 41 is not particularly limited as long as the shaft 50 can be supported by the support portions 31 and 41, and for example, it may be a stepped surface.

[0066] In the above embodiment, the first moving means 10 and the second moving means 11 are each composed of bolts 100 and 110 and restricting members 101 and 111. However, the configuration of the first moving means 10 and the second moving means 11 is not particularly limited as long as they perform the function of moving the first support member 3 and the second support member 4 along the axial direction of the shaft 50 and stopping them at the moved position. For example, the first moving means 10 and the second moving means 11 may each be composed of male threads formed on the outer circumferential surfaces of the first support member 3 and the second support member 4, and screw holes formed in the first side cover 21 and the second side cover 22 of the casing 2, having female threads that engage with the male threads. In this modified example, the first moving means 10 and the second moving means 11 can move the first support member 3 and the second support member 4 from a first position to a second position by screwing them into the screw holes, respectively.

[0067] Furthermore, in the above embodiment, the rotating machine 1 is a vacuum vapor compressor, but the rotating machine 1 may be any of the following rotating machines, such as a compressor, steam turbine, generator, blower, electric motor, drive machine, actuator, or machine tool, and the concept can be appropriately modified depending on the type of rotating machine. [Explanation of Symbols]

[0068] 1. Rotating Machine 2 Casing 21 First side lid 22 Second side lid 3 First support material 4 Second support material 5 rotors 50 shaft 6. First Housing 7. Second Housing 8. First bearing 9. Second bearing 10 First means of transportation 100 volts 101 Regulated material 11 Second means of transportation 110 volts 111 Regulated materials

Claims

1. A support mechanism for supporting the shaft when removing the bearings in a rotating machine comprising a cylindrical casing, a rotor housed in the casing, and a pair of bearings that rotatably support the shaft of the rotor, A ring-shaped first support member is positioned at a first location inside one end of the casing, with a gap around the shaft, A ring-shaped second support member is positioned at a first location inside the other end of the casing, with a gap around the shaft, A first moving means moves the first support member along the axial direction of the shaft and keeps the first support member stationary at the moved position, A second moving means for moving the second support member along the axial direction of the shaft and for keeping the second support member stationary at the moved position, Equipped with, The first support member and the second support member each include a support portion that supports the shaft by having its inner circumferential surface in contact with the outer circumferential surface of a portion of the shaft at a second position further from the end of the casing than the first position, The first support member and the second support member each have at least one screw hole formed therein. At least one bolt insertion hole is formed at each end of the casing, communicating with the screw hole. The first moving means and the second moving means are, A bolt having a head that fits into the bolt insertion hole and a threaded portion on the opposite side of the head that passes through the bolt insertion hole and is screwed into the threaded hole, At least one restricting member that prevents the head of the bolt from coming out of the bolt insertion hole, A support mechanism composed of these elements.

2. A support mechanism for supporting the shaft when removing the bearings in a rotating machine comprising a cylindrical casing, a rotor housed in the casing, and a pair of bearings that rotatably support the shaft of the rotor, A ring-shaped first support member is positioned at a first location inside one end of the casing, with a gap around the shaft, A ring-shaped second support member is positioned at a first location inside the other end of the casing, with a gap around the shaft, A first moving means moves the first support member along the axial direction of the shaft and keeps the first support member stationary at the moved position, A second moving means for moving the second support member along the axial direction of the shaft and for keeping the second support member stationary at the moved position, Equipped with, The first support member and the second support member each include a support portion that supports the shaft by having its inner circumferential surface in contact with the outer circumferential surface of a portion of the shaft at a second position further from the end of the casing than the first position, The first moving means and the second moving means are, Male screws formed on the outer circumferential surfaces of the first support member and the second support member, A support mechanism comprising a screw hole formed at the end of the casing, having a female screw that engages with the male screw.

3. The support mechanism according to claim 1 or 2, wherein the inner circumferential surface of the support portion gradually widens in diameter toward the inside, and the portion of the shaft that the support portion contacts at the second position has an outer circumferential surface that gradually narrows in diameter toward the end of the shaft.

4. A polygonal hole is formed in the head of the bolt. The support mechanism according to claim 1, wherein the restricting material is a plate attached to the end of the casing so as to cover the head of the bolt, and the plate has an opening formed therein that exposes the hole of the bolt head.

5. A cylindrical casing, The rotor housed in the aforementioned casing, A pair of bearings that rotatably support the shaft of the rotor, A first housing that houses one of the pair of bearings, the first housing being attached to one end of the casing, A second housing that houses the other bearing of the pair of bearings, the second housing being attached to the other end of the casing, The support mechanism according to claim 1 or 2, which supports the shaft when the pair of bearings are removed, A rotating machine equipped with the following features.

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