JP2024016482A - How to remove shaft support mechanism, rotating machinery and bearings - Google Patents

Abstract

An object of the present invention is to provide a rotating machine and a support mechanism that supports the shaft of a rotor when a bearing that rotatably supports the shaft of the rotor is removed from the rotating machine. A support mechanism that supports a shaft 50 when removing bearings 8 and 9 from a rotating machine 1 is provided around the shaft 50 at a first position inside a first side lid 21 and inside a second side lid 22. A ring-shaped first support member 3 and a second support member 4 are arranged with a gap between them, and the position where the first support member 3 is moved along the axial direction of the shaft 50 and the first support member 3 is moved. A first moving means 10 for moving the second supporting member 4 along the axial direction and a second moving means 11 for moving the second supporting member 4 and stopping the second supporting member 4 at the moved position, 3 and the second support member 4 are supports whose inner circumferential surfaces contact the outer circumferential surface of a portion 500 of the shaft 5 at a second position farther from the side covers 21 and 22 than the first position to support the shaft 50. The parts 31 and 41 are included. [Selection diagram] Figure 1

Description

The present invention relates to a support mechanism that supports a shaft of a rotor when removing a bearing that rotatably supports the shaft of a rotor in a rotating machine, a rotating machine that includes the support mechanism, and a method for removing a bearing from the rotating machine.

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

Bearings may be damaged if they are used for a certain amount of time, and the lubricating grease gradually deteriorates, reducing the lubricating ability. Therefore, it is necessary to perform regular maintenance and replace the bearings.

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 background art in Patent Document 1).

Re-published patent number 2012-164726

However, with the method described above, it takes a lot of effort and time to pull out the shaft from the casing. Furthermore, when removing the bearing from the shaft, if the orientation of the shaft remains horizontal, the shaft may wobble due to the weight of the shaft, impeller, etc., which may lead to damage to the seal mechanism disposed near the bearing. Therefore, it is necessary to change the orientation of the shaft so that it is vertical and leave it still, and the work of removing the bearing also requires a great deal of effort and time.

The present invention has been made with an eye to solving the above-mentioned problems, and includes a support mechanism that supports a shaft of a rotor when removing a bearing that rotatably supports the shaft of a rotor in a rotating machine, and a support mechanism equipped with the support mechanism. The present invention aims to provide a rotating machine and a method for removing a bearing from the rotating machine.

In order to solve the above-mentioned problem, the present invention focuses on the support mechanism described in the following item 1.

Item 1. A support mechanism for supporting the shaft when the bearing is removed in a rotating machine including a cylindrical casing, a rotor housed in the casing, and a pair of bearings rotatably supporting the shaft of the rotor. hand,
a ring-shaped first support member disposed around the shaft at a first position inside one end of the casing with a gap;
a ring-shaped second support member disposed at a first position inside the other end of the casing around the shaft with a gap;
a first moving means for moving the first supporting member along the axial direction of the shaft and stopping the first supporting member at the moved position;
a second moving means for moving the second supporting member along the axial direction of the shaft and stopping the second supporting member at the moved position;
Equipped with
The first support member and the second support member have inner circumferential surfaces in contact with an outer circumferential surface of a portion of the shaft at a second position farther from the end of the casing than the first position, so that the shaft A support mechanism including a support part that supports.

Further, the support mechanism of the present invention includes the support mechanism described in the following item 2 as a preferable embodiment of the support mechanism described in the above item 1.

Item 2. The inner circumferential surface of the support part gradually increases in diameter as it goes inward, and the portion of the shaft that the support part contacts at the second position has a diameter that gradually increases as it goes toward the end of the shaft. Item 1. The support mechanism according to item 1, wherein the outer circumferential surface is gradually reduced in diameter.

Further, the support mechanism of the present invention includes the support mechanism described in the following item 3 as a preferable embodiment of the support mechanism described in the above items 1 and 2.

Item 3. At least one screw hole is formed in each of the first support material and the second support material,
At least one bolt insertion hole communicating with the screw hole is formed at both ends of the casing, and
The first moving means and the second moving means each include:
at least one bolt whose head is accommodated in the bolt insertion hole and whose threaded portion on the opposite side of the head passes through the bolt insertion hole and is screwed into the screw hole;
at least one restricting member that restricts the head of the bolt from coming out of the bolt insertion hole;
The support mechanism according to Item 1 or 2, comprising:

Further, the support mechanism of the present invention includes the support mechanism described in the following item 4 as a preferable embodiment of the support mechanism described in the above item 3.

Item 4. A polygonal hole is formed in the head of the bolt,
A polygonal hole is formed in the head of the bolt,
Item 3, wherein the regulating material is a plate attached to an end of the casing so as to cover the head of the bolt, and the plate has an opening that exposes a hole in the head of the bolt. The support mechanism described in .

Further, the support mechanism of the present invention includes the support mechanism described in Item 5 below as a preferable embodiment of the support mechanism described in Items 1 and 2 above.

Item 5. The first moving means and the second moving means each include:
a male thread formed on the outer peripheral surfaces of the first support member and the second support member;
a screw hole formed at an end of the casing and having a female thread that engages with the male screw;
The support mechanism according to Item 1 or 2, comprising:

Moreover, in order to solve the above-mentioned problem, the subject of the present invention is a rotating machine described in the following item 6.

Item 6. a cylindrical casing;
a rotor housed in the casing;
a pair of bearings rotatably supporting the shaft of the rotor;
a first housing housing one of the pair of bearings, the first housing being attached to one end of the casing;
a second housing housing the other of the pair of bearings, the second housing being attached to the other end of the casing;
A rotating machine comprising: a support mechanism according to any one of claims 1 to 5, which supports the shaft when removing the pair of bearings.

Moreover, in order to solve the above-mentioned problem, the subject of the present invention is a support mechanism described in the following item 7.

Section 7. a cylindrical casing, a rotor housed in the casing, a pair of bearings rotatably supporting a shaft of the rotor, and one end of the casing housing one of the pair of bearings; A method for removing the bearing in a rotating machine comprising: a first housing attached to the other end of the casing; and a second housing accommodating the other of the pair of bearings and attached to the other end of the casing. There it is,
A ring-shaped first support member disposed with a gap around the shaft at a first position inside one end of the casing is separated from the one end along the axial direction of the shaft. supporting the part of the shaft by a support part whose inner peripheral surface contacts the outer peripheral surface of the part of the shaft at the second position in the first support member;
A ring-shaped second support member disposed with a gap around the shaft at a first position inside the other end of the casing is separated from the other end along the axial direction of the shaft. and supporting the other part of the shaft by a support part whose inner circumferential surface contacts an outer circumferential surface of the other part of the shaft at the second position in the second support member. The process of
removing the first housing and the second housing from the casing while the shaft is supported by the support part of the first support member and the support part of the second support member and the shaft is kept horizontal; and,
How to have.

According to the present invention, it is possible to support the shaft of a rotor when removing a bearing that rotatably supports the shaft of a rotor in a rotating machine. Therefore, when performing maintenance work, the shaft is held horizontally, so the bearing can be removed without pulling the shaft out of the casing, and the bearing can be replaced easily.

It is a sectional view of a rotating machine. FIG. 2 is an enlarged cross-sectional view of a part of FIG. 1; FIG. 3 is an enlarged cross-sectional view of a part of FIG. 2; FIG. 2 is an enlarged cross-sectional view of another part of FIG. 1; FIG. 5 is an enlarged cross-sectional view of a part of FIG. 4; FIG. 3 is a front view of the regulating material.

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, drives, 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 evaporation concentrator as a rotating machine.

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

Each component that mainly constitutes the rotating machine 1 will be described below.

First, as shown in FIG. 1, the casing 2 has a cylindrical shape, for example. The casing 2 includes a main body 20, a first side lid 21 that covers one opening of the main body 20 in the axial direction, and a second side lid 22 that covers the other opening of the main body 20 in the axial direction. In the casing 2 of this embodiment, a steam introduction part 23 is provided on the second side lid 22, and the high pressure steam after compressing the steam supplied into the casing 2 is discharged to the outside of the casing 2. A steam outlet is provided.

The main body 20 has an internal space that accommodates a central portion of the shaft 50 of the rotor 5 and a plurality of impellers 51 that are integrally provided on the outer peripheral surface of the central portion. The first side lid 21 and the second side lid 22 each form an end portion of the casing 2 and close the internal space. In this embodiment, the first side lid 21 and the second side lid 22 are removably attached to the main body 20. The first side cover 21 and the second side cover 22 can be removably fixed to the main body 20 using bolts, for example.

A substantially central portion of the first side lid 21 is recessed. A central portion of the shaft 50 passes through the central portion 210 of the first side lid 21 located in this recess, and one end portion of the shaft 50 protrudes outside the first side lid 21 . Note that "outside" means the side of the first side lid 21 opposite to the internal space of the main body 20. The recessed portion of the first side lid 21 is covered with a cover 13.

A first shaft sealing mechanism 16 that seals a gap formed between the shaft 50 and the first side lid 21 is attached to the center portion 210 of the first side lid 21 on the outer surface. The first shaft sealing mechanism 16 can be of a conventionally known structure used in this type of device, and examples thereof include a dry seal, a double dry seal, a double mechanical seal, and the like.

As shown in FIGS. 2 and 3, in this embodiment, a concave portion 212 is formed in the center portion 210 of the first side lid 21 on the inner surface thereof. Further, in the present embodiment, at least one bolt insertion hole 211, preferably a plurality of bolt insertion holes 211, are formed in the central portion 210 of the first side lid 21 at a position passing through the recess 212. The plurality of bolt insertion holes 211 are preferably formed in the center portion 210 of the first side lid 21 so as to be located at predetermined intervals on the circumference of a desired virtual circle.

As shown in FIG. 1, the second side lid 22 has a central portion 220 penetrated by a shaft 50, and the other end of the shaft 50 protrudes outside the second side lid 22. Note that "outside" means the side of the second side lid 22 opposite to the internal space of the main body 20.

A second shaft sealing mechanism 17 that seals the gap formed between the shaft 50 and the second side lid 22 is attached to the central portion 220 of the second side lid 22 on the outer surface. The second shaft sealing mechanism 17 can be of a conventionally known structure used in this type of device, and examples thereof include a dry seal, a double dry seal, a double mechanical seal, and the like.

As shown in FIGS. 4 and 5, in this embodiment, a concave portion 222 is formed in the center portion 220 of the second side lid 22 on the inner surface thereof. Further, in the present embodiment, at least one bolt insertion hole 221, preferably a plurality of bolt insertion holes 221, are formed in the central portion 220 of the second side lid 22 at a position passing through the recess 222. The plurality of bolt insertion holes 221 are preferably formed in the center portion 220 of the second side lid 22 so as to be located at predetermined intervals on the circumference of a desired virtual circle.

In addition, the center part 210 of the first side cover 21 and the center part 220 of the second side cover 22 are not particularly limited, but are different from other parts of the first side cover 21 and other parts of the second side cover 22, respectively. It may also be removable.

Next, as shown in FIG. 1, the rotor 5 rotates within the casing 2 using the motor as a driving source. The rotor 5 includes a shaft 50 that is a rotating shaft. The shaft 50 has a circular rod shape and includes a large diameter central portion and small diameter end portions.

A plurality of impellers 51 are protruded from the center of the shaft 50 at intervals along the axial direction. Although the central portion of the shaft 50 may be formed to have the same outer diameter over the entire length in the axial direction, in this embodiment, as shown in FIGS. , is formed in a tapered shape (the outer peripheral surface becomes smaller in diameter) toward the end. The above-mentioned tapered portion in the central portion of the shaft 50 is referred to as a tapered portion 500.

As shown in FIG. 1, one end of the shaft 50 is rotatably supported by a first bearing 8 housed in the first housing 6. One end of the shaft 50 passes through the first housing 6 and projects to the outside of the first housing 6, and the balance disc 12 is removably attached to one end of the shaft 50. Note that the "outside" means the side of the first housing 6 opposite to the first side lid 21 side.

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 passes through 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 via a coupling, a pulley, etc. connected to the motor. In this embodiment, the protruding portion of the other end of the shaft 50 is connected to the motor via the pulley 14. Note that "outside" means the side of the second housing 7 opposite to the second side lid 22 side.

Next, as shown in FIG. 1, the first housing 6 is removably attached to the center portion 210 of the first side lid 21 outside the first shaft sealing mechanism 16. The first housing 6 can be removably fixed to the center portion 210 of the first side lid 21 using, for example, bolts 15. A first bearing 8 is housed in the center 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 lid 21 and the first bearing 8 can be accommodated.

Next, as shown in FIG. 1, the second housing 7 is removably attached to the central portion 220 of the second side lid 22 outside the second shaft sealing mechanism 17. The second housing 7 can be removably fixed to the center portion 220 of the second side cover 22 using, for example, bolts 15. A second bearing 9 is housed in the center 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 accommodated.

Next, as shown in FIG. 1, the first bearing 8 and the second bearing 9 are not particularly limited as long as they can each rotatably support the end of the shaft 50. As the first bearing 8 and the second bearing 9, conventionally known bearings such as ball bearings, roller bearings, flat bearings, and angular bearings can be used.

Next, as shown in FIGS. 1 to 5, the first support member 3 and the second support member 4 are smaller in size than the center portion 210 of the first side lid 21 and the center portion 220 of the second side lid 22, respectively. It has a small disk shape. As shown in FIGS. 3(A) and 4(A), the first supporting material 3 and the second supporting material 4 are normally placed on the first side inside the first side lid 21 and the second side lid 22, respectively. It is arranged at a position close to the lid 21 and the second side lid 22, preferably at a position adjacent to the lid 21 and the second side lid 22. This position will be referred to as the "first position".

In this embodiment, the first support member 3 and the second support member 4 have an outer diameter slightly smaller than the inner diameter of the recess 212 of the first side lid 21 and the inner diameter of the recess 222 of the second side lid 22, respectively. The thickness is larger than the depth of the recess 212 of the first side lid 21 and the depth of the recess 222 of the second side lid 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 lid 21 and the recess 222 of the second side lid 22, respectively. As described above, in the present embodiment, the first support member 3 and the second support member 4 are always fitted into the recess of the first side lid 21 and the recess of the second side lid 22, respectively, in the first position. It stands still with a gap left around the center of the shaft 50.

The diameter of the opening 30 at the center of the first support member 3 and the diameter of the opening 40 at the center of the second support member 4 are determined at a portion closer to the end of the shaft 50 than the tapered portion 500 in the center of the shaft 50. Slightly larger than the outer diameter of 501. Therefore, when the first support member 3 and the second support member 4 are in the first position, they do not contact the shaft 50 when the shaft 50 rotates, and do not interfere with the rotation of the shaft 50. Moreover, the first support member 3 and the second support member 4 can move smoothly without friction between them and the shaft 50 when moving inward from the first position along the axial direction of the shaft 50, respectively.

The opening 30 of the first support member 3 and the opening 40 of the second support member 4 may be formed to have the same diameter over the entire length in the axial direction, but in this embodiment, FIGS. 3 and 5 As shown in FIG. The inner circumferential surface of No. 4 is formed in a tapered shape with an enlarged diameter. In the first support member 3 and the second support member 4, the portions where the openings 30 and 40 are tapered as described above are referred to as support portions 31 and 41, respectively.

The angle of inclination of the inner circumferential surfaces of the supporting parts 31 and 41 with respect to the axial direction matches or almost matches the angle of inclination 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 respectively move inward from the first position along the axial direction of the shaft 50, as shown in FIGS. 3(B) and 4(B), Then, the tapered portion 500 of the shaft 50 is fitted into the support portion 31 of the first support member 3 and the support portion 41 of the second support member 4, so that the inner peripheral surfaces of both support portions 31, 41 and the tapered portion 500 are in close contact with the outer circumferential surface. The position where the first support member 3 and the second support member 4 each contact the tapered portion 500 of the shaft 50 is referred to as a “second position”. The second position is a position farther from the first side lid 21 and the second side lid 22 than the first position.

As shown in FIGS. 2 to 5, at least one screw hole 32, 42 is formed in the first support member 3 and the second support member 4, respectively. The screw holes 32 and 42 are formed in the first support member 3 and the second support member 4 at positions communicating with the bolt insertion holes 211 of the first side cover 21 and the bolt insertion holes 221 of the second side cover 22, respectively. In this embodiment, a plurality of screw holes 32 and 42 are formed in the first support member 3 and the second support member 4, respectively, so as to be located at a predetermined interval on the circumference of a desired virtual circle. ing.

Next, as shown in FIGS. 1 to 5, the first moving means 10 moves the first support member 3 between the first position and the second position described above along the axial direction of the shaft 50. At the same time, the first support member 3 is made to stand still at the moved position. The second moving means 11 also moves the second supporting member 4 along the axial direction of the shaft 50 between the first position and the second position, and also moves the second supporting member 4 to the moved position. Make it stand still. Note that "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, and do not move in a direction perpendicular to the axial direction and move around the shaft 50. It means to be fixed.

In this embodiment, the first moving means 10 and the second moving means 11 each include bolts 100, 110 and regulating members 101, 111.

The heads of the bolts 100 and 110 are respectively accommodated in the bolt insertion hole 211 of the first side cover 21 and the bolt insertion hole 221 of the second side cover 22, and the threaded portions on the opposite side of the head are accommodated in the bolt insertion hole 211. , 221 and is screwed into the screw hole 32 of the first support member 3 and the screw hole 42 of the second support member 4. Note that the bolt insertion holes 211 and 221 are designed in such a shape that the heads of the bolts 100 and 110 do not pass through the bolt insertion holes 211 and 221, respectively.

As shown in FIG. 6, polygonal holes 103 and 113, such as hexagonal holes, are formed in the heads of the bolts 100 and 110, respectively. The bolts 100, 110 can be rotated within the bolt insertion holes 211, 221 by using a hexagonal wrench or the like.

As shown in FIGS. 2 to 6, the regulating 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 regulating members 101 and 111 are plate materials attached to the outer surface of the first side cover 21 and the outer side of the second side cover 22, respectively, so as to cover the heads of the bolts 100 and 110. The regulating members 101 and 111 can be removably fixed to the first side cover 21 and the second side cover 22 using, for example, bolts 102 and 112, but may also be fixed using an adhesive or the like.

Openings 104 and 114 are formed in the regulating members 101 and 111, respectively, and are smaller in size than the heads of the bolts 100 and 110 and expose holes 103 and 113 in the heads of the bolts 100 and 110, respectively.

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

First, on the first bearing 8 side, remove the cover 13 from the first side lid 21 of the casing 2, and insert a hexagonal wrench or the like into the bolt 100 through the opening 60 (shown in FIG. 2) formed in the first housing 6. Engage with the hole 103 in the head. Then, use a hexagonal wrench or the like to turn the bolt 100 in a loosening direction. As a result, the bolt 100 tries 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 cover 21 by the regulating member 101. Therefore, as shown in FIG. 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.

Then, continue turning the bolt 100 in the loosening direction until the first support reaches the second position where the support part 31 of the first support member 3 comes into contact with the tapered part 500 of the shaft 50, as shown in FIG. 3(B). Move material 3 inward. Thereby, the shaft 50 is supported by the first support member 3.

Next, on the second bearing 9 side, similarly to the first bearing 8 side, insert a hexagonal wrench or the like into the head of the bolt 110 through the opening 70 (shown in FIG. 4) formed in the second housing 7. Engage with hole 113. Then, use a hexagonal wrench or the like to turn the bolt 110 in a loosening direction. As a result, the bolt 110 tries 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 regulating member 111. Therefore, as shown in FIG. 5(A), the second support member 4 moves inward away from the second side lid 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.

Then, continue turning the bolt 110 in the loosening direction until the second support reaches the second position where the support part 41 of the second support member 4 comes into contact with the tapered part 500 of the shaft 50, as shown in FIG. 5(B). Move material 4 inward. Thereby, the shaft 50 is supported by the second support member 4.

By supporting the shaft 50 with the pair of support members 3 and 4 in this way, the shaft 50 can be held in a horizontal state instead of the pair of bearings 8 and 9.

Then, by loosening the bolts 15, the first housing 6 housing the first bearing 8 is removed from the first side lid 21, and the second housing 7 housing the second bearing 9 is removed from the second side lid 22. Thereby, the pair of bearings 8 and 9 can be removed from the rotating machine 1.

According to the rotating machine 1 equipped with the support mechanism of this embodiment, when removing the pair of bearings 8 and 9, there is no need to pull out the shaft 50 from the casing 2, and the shaft 50 is held horizontally. , maintenance work such as bearing replacement work can be easily performed.

Moreover, according to the rotating machine 1 provided with the support mechanism of this embodiment, the inner peripheral surfaces of the support part 31 of the first support member 3 and the support part 41 of the second support member 4 are inclined, and the support part 31, Since the outer peripheral surface of the tapered portion 50 of the shaft 5 that the shaft 5 comes into contact with is inclined in accordance with the inclination of the support portion 41, the shaft 50 can be supported in a well-balanced manner by the pair of support members 3 and 4.

Although the support mechanism and rotating machine 1 of this embodiment have been described above, the above embodiment is merely an example and is not restrictive. Therefore, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

For example, in the above embodiment, the inner circumferential surface of the supporting portion 31 of the first supporting member 3 and the inner circumferential surface of the supporting portion 41 of the second supporting member 4 are tapered inclined surfaces, and in the shaft 50, the supporting portion 31, The outer circumferential surface of the portion (the tapered portion 50 in the above embodiment) with which the inner circumferential surface of 41 comes into contact is also a tapered inclined surface. However, the shape of the inner circumferential surfaces of the supporting parts 31, 41 and the outer circumferential surface of the portion of the shaft 5 where the inner circumferential surfaces of the supporting parts 31, 41 contact are limited in particular, as long as the shaft 50 can be supported by the supporting parts 31, 41. For example, it may be a stepped surface.

Moreover, in the embodiment described above, the first moving means 10 and the second moving means 11 are each composed of bolts 100, 110 and regulating members 101, 111. However, the first moving means 10 and the second moving means 11 have the function of moving the first supporting member 3 and the second supporting member 4 along the axial direction of the shaft 50 and stopping them at the moved positions. If so, the configuration is not particularly limited. For example, the first moving means 10 and the second moving means 11 have male screws formed on the outer circumferential surfaces of the first supporting member 3 and the second supporting member 4, and the first side lid 21 and the second side cover of the casing 2, respectively. It may be constituted by a screw hole formed in the side cover 22 and having a female screw that engages with the male screw. The first moving means 10 and the second moving means 11 of this modification are capable of moving the first supporting member 3 and the second supporting member 4 into the first supporting member by screwing the first supporting member 3 and the second supporting member 4 into the screw holes respectively. It is movable from one position to a second position.

Further, in the above embodiment, the rotating machine 1 is a vacuum steam compressor, but the rotating machine 1 may be various rotating machines such as a compressor, a steam turbine, a generator, an air blower, an electric motor, a drive machine, an actuator, a machine tool, etc. The concept can be changed as appropriate depending on the type of rotating machine.

1 Rotating machine 2 Casing 21 First side cover 22 Second side cover 3 First support member 4 Second support member 5 Rotor 50 Shaft 6 First housing 7 Second housing 8 First bearing 9 Second bearing 10 First Moving means 100 bolt 101 regulating material 11 second moving means 110 bolt 111 regulating material

Claims (7)

A support mechanism for supporting the shaft when the bearing is removed in a rotating machine including a cylindrical casing, a rotor housed in the casing, and a pair of bearings rotatably supporting the shaft of the rotor. hand,
a ring-shaped first support member disposed around the shaft at a first position inside one end of the casing with a gap;
a ring-shaped second support member disposed at a first position inside the other end of the casing around the shaft with a gap;
a first moving means for moving the first supporting member along the axial direction of the shaft and stopping the first supporting member at the moved position;
a second moving means for moving the second supporting member along the axial direction of the shaft and stopping the second supporting member at the moved position;
Equipped with
The first support member and the second support member have inner circumferential surfaces in contact with an outer circumferential surface of a portion of the shaft at a second position farther from the end of the casing than the first position, so that the shaft A support mechanism including a support part that supports. The inner circumferential surface of the support part gradually increases in diameter as it goes inward, and the portion of the shaft that the support part contacts at the second position has a diameter that gradually increases as it goes toward the end of the shaft. The support mechanism according to claim 1, wherein the outer circumferential surface is gradually reduced in diameter. At least one screw hole is formed in each of the first support material and the second support material,
At least one bolt insertion hole communicating with the screw hole is formed at both ends of the casing, and
The first moving means and the second moving means each include:
at least one bolt whose head is accommodated in the bolt insertion hole and whose threaded portion on the opposite side of the head passes through the bolt insertion hole and is screwed into the screw hole;
at least one restricting member that restricts the head of the bolt from coming out of the bolt insertion hole;
The support mechanism according to claim 1, comprising: A polygonal hole is formed in the head of the bolt,
The regulating material is a plate material attached to an end of the casing so as to cover the head of the bolt, and the plate material has an opening that exposes a hole in the head of the bolt. 3. The support mechanism according to 3. The first moving means and the second moving means each include:
a male thread formed on the outer peripheral surfaces of the first support member and the second support member;
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, comprising: a cylindrical casing;
a rotor housed in the casing;
a pair of bearings rotatably supporting the shaft of the rotor;
a first housing housing one of the pair of bearings, the first housing being attached to one end of the casing;
a second housing housing the other of the pair of bearings, the second housing being attached to the other end of the casing;
A rotating machine comprising: a support mechanism according to any one of claims 1 to 5, which supports the shaft when removing the pair of bearings. a cylindrical casing, a rotor housed in the casing, a pair of bearings rotatably supporting a shaft of the rotor, and one end of the casing housing one of the pair of bearings; A method for removing the bearing in a rotating machine comprising: a first housing attached to the other end of the casing; and a second housing accommodating the other of the pair of bearings and attached to the other end of the casing. There it is,
A ring-shaped first support member disposed with a gap around the shaft at a first position inside one end of the casing is separated from the one end along the axial direction of the shaft. supporting the part of the shaft by a support part whose inner peripheral surface contacts the outer peripheral surface of the part of the shaft at the second position in the first support member;
A ring-shaped second support member disposed with a gap around the shaft at a first position inside the other end of the casing is separated from the other end along the axial direction of the shaft. and supporting the other part of the shaft by a support part whose inner circumferential surface contacts an outer circumferential surface of the other part of the shaft at the second position in the second support member. The process of
removing the first housing and the second housing from the casing while the shaft is supported by the support part of the first support member and the support part of the second support member and the shaft is kept horizontal; and,
How to have.

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