JP2013160069A - Impeller and rotary machine with impeller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow an impeller to be simply mounted on a rotary shaft in a short time.SOLUTION: An impeller 1 includes: a body 2 which has a disk-shaped disk 5 mounted outside a rotary shaft; and a plurality of blades 6 mounted on a surface facing one side of an axial direction of the disk 5 so as to extend from an inner circumference side toward an outer circumference side in a radial direction of the disk 5 and arranged in a circumferential direction of the disk 5; and a pair of fixing members 3 and 4 which are circularly formed fitted with shrinkage-fit on the outer circumferential surface of the rotary shaft S and provided sandwiching the body 2 from both sides of the axial direction of the body 2. At least one fixing member 3 is engaged with body 2 so as to control a relative rotation around the axis of the body 2.

Description

  The present invention relates to a rotary machine such as a centrifugal compressor, and more particularly to an impeller used in the rotary machine.

An impeller used for a rotary machine such as a centrifugal compressor is configured by a disk 82, a blade 83, and a cover 84 as shown in FIG.
The disk 82 in this impeller includes a cylindrical portion 82a that is externally fitted to the rotating shaft, and an annular disc portion 82b that projects radially outward from a portion on one axial side (left side in FIG. 12) on the outer peripheral surface of the cylindrical portion 82a. And are integrally molded. A plurality of the blades 83 are arranged at intervals in the circumferential direction on the surface facing the other axial side (the right side in FIG. 12) of the annular disk portion 82b so as to cover these blades 83 from the other axial side. The cover 84 is attached integrally.

Conventionally, when this impeller is fixed to a rotating shaft, for example, it has been considered to shrink fit the other axial portion of the cylindrical portion 82a of the disk 82 to the rotating shaft. In addition, conventionally, for example, as described in Patent Document 1, it is also conceivable to extend one side in the axial direction of the cylindrical portion 82a in the axial direction and then shrink-fit this extended portion to the rotating shaft. ing.
Conventionally, since the impeller is firmly fixed to the rotating shaft by shrink fitting the impeller directly on the rotating shaft as described above, during operation of the rotating machine (in a state where the rotating shaft is rotating) The rotational force of the rotating shaft can be transmitted to the impeller. Further, even when a force (thrust force) that moves the impeller in the axial direction is applied to the impeller during operation of the rotating machine, the impeller is prevented from moving in the axial direction, and the vibration caused by the movement of the impeller. Can be prevented.

Japanese Patent Laid-Open No. 9-42193

However, when the impeller is shrink-fitted directly on the rotary shaft as in the conventional case, it is necessary to heat not only the cylindrical portion 82a but also the entire impeller including the annular disk portion 82b. There is a problem that is difficult.
Moreover, the time which heats the cylindrical part 82a becomes long, and there exists a problem that the construction time which attaches an impeller to a rotating shaft becomes long.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide an impeller capable of easily and quickly mounting an impeller on a rotating shaft, and a rotating machine including the impeller.

  In order to solve this problem, an impeller according to the present invention includes a disk-shaped disk that is externally mounted on a rotating shaft, and one axial direction of the disk extending from the radially inner periphery side to the outer periphery side of the disk. A main body having a plurality of blades attached to a surface facing the disk and arranged in the circumferential direction of the disk; and an annular shape fitted into the outer peripheral surface of the rotating shaft by shrink fitting, and the shaft of the main body A pair of fixing members provided so as to sandwich the main body portion from both sides in the direction, and at least one fixing member of the pair of fixing members restricts relative rotation about the axis of the main body portion. It is characterized by being engaged with the part.

  In the impeller having the above-described configuration, the volume of the pair of fixing members can be set smaller than that of the main body, and thereby the heat capacity of the pair of fixing members can be made smaller than that of the main body. And when attaching this impeller to a rotating shaft, since only a pair of fixing member with small heat capacity should be heated and shrink-fitted on a rotating shaft, temperature control at the time of heating can be performed easily. That is, the impeller can be easily attached to the rotating shaft. In addition, since the fixing member having a smaller heat capacity compared to the main body can be heated in a short time, the construction time for attaching the impeller to the rotating shaft can be shortened.

  In addition, in the state which attached the said impeller to the rotating shaft, since a main-body part is pinched | interposed by a pair of fixing member, it can prevent that a main-body part moves to an axial direction with respect to a rotating shaft. In addition, at least one of the fixing members is not only fixed to the rotating shaft by shrink fitting, but also engages with the main body so as to restrict relative rotation around the axis of the main body with respect to the one fixing member. Therefore, even if the main body is not shrink-fitted with respect to the rotation shaft, the main body can be rotated integrally with the rotation shaft.

In the impeller, the main body portion includes a cover that covers the plurality of blades from one axial side, and a first fixing member provided on one axial side of the disk among the pair of fixing members is provided. It is preferable that the cover is arranged at an interval on the radially inner peripheral side.
In the impeller configured as described above, an insertion hole extending in the radial direction of the disk is formed by two blades adjacent to each other in the circumferential direction of the disk in the gap between the disk and the cover, and the shaft is interposed between the cover and the first fixing member. The gap extending in the direction is communicated with the insertion hole. These insertion holes and gaps function as impeller flow paths.

  In the impeller, a first fixing member provided on one side in the axial direction of the disk among the pair of fixing members may be arranged at an interval on the radially inner peripheral side of the blade.

As described above, the first fixing member is arranged on the radially inner peripheral side of the cover or blade with a space therebetween, so that the length of the first fixing member protruding from the main body portion to the one axial side is shortened. In other words, the axial dimension of the impeller can be shortened. Further, when a plurality of impellers are arranged in the axial direction of the rotary shaft, the arrangement length can be shortened. Therefore, the axial dimension of the rotating shaft can be set short, and as a result, the rigidity of the rotating shaft can be improved.
In the case of manufacturing a main body united with a disk, a blade and a cover, when the above-mentioned insertion hole is formed by cutting such as machining or electric discharge machining, the cutting processing tool is radially It becomes easy to insert into the insertion hole from the side. That is, the main body can be easily manufactured.

Further, in the impeller, an annular insertion hole that is recessed from a surface facing the other side in the axial direction is formed in the disk, and a second fixing provided on the other side in the axial direction of the disk among the pair of fixing members. A member may be inserted into the insertion hole.
Even if it is the said structure, since the length which a 2nd fixing member protrudes to an axial direction other side from a main-body part can be shortened, it becomes possible to shorten the axial direction dimension of an impeller similarly to the structure mentioned above.

  In the impeller, the pair of fixing members may be engaged with the main body so as to restrict relative rotation around the axis of the main body.

  Furthermore, in the impeller, an engagement recess that is recessed from a surface facing the other of the fixing member and the main body is formed in a part of the circumferential direction of one of the fixing member and the main body, It is preferable that an engaging convex portion that can be inserted into the engaging concave portion is formed on the other of the fixing member and the main body portion.

  According to the impeller having the above configuration, the engagement protrusion formed on the other of the fixing member and the main body is inserted into the engagement recess formed on one of the fixing member and the main body, thereby fixing the main body to the main body. The member is engaged, and relative rotation around the axis of the main body portion with respect to the fixed member can be reliably restricted.

  Further, in the impeller, insertion grooves that are recessed from surfaces facing each other are formed in a part of each of the fixing member and the main body in the circumferential direction, and the insertion of both the fixing member and the main body is performed. The same insertion piece may be inserted into the groove.

  According to the impeller having the above-described configuration, the same insertion piece is inserted into the insertion grooves of both the fixing member and the main body portion, whereby the main body portion and the fixing member are engaged, and the main body portion with respect to the fixing member The relative rotation around the axis of can be reliably regulated.

The rotating machine of the present invention includes a rotating shaft, the impeller, and a casing that rotatably supports the rotating shaft and that defines a flow path for flowing fluid from the upstream side to the downstream side together with the impeller. It is characterized by providing.
Such a rotating machine can be easily manufactured in a short time by employing the impeller.

In the rotary machine, when a plurality of the impellers are arranged in the axial direction of the rotary shaft, the two fixing members positioned between the two main body portions adjacent in the axial direction are integrated. It is preferable to be formed.
In other words, only one fixing member may be disposed between the two main body portions.

In the above configuration, since the number of fixing members constituting the rotating machine is reduced, the manufacturing cost of the rotating machine and the man-hours for attaching a plurality of impellers to the rotating shaft (especially the number of operations for shrink-fitting the fixing member to the rotating shaft) are reduced. It becomes possible to do.
In addition, since the interval between two main body portions adjacent in the axial direction can be set only by the axial dimension of one fixing member, compared with the case where two fixing members are arranged between two main body portions. The interval between the two main body portions can be set easily and accurately, and can be maintained appropriately.

  According to the present invention, the impeller can be easily attached to the rotating shaft in a short time.

It is a schematic sectional drawing which shows the centrifugal compressor which concerns on 1st embodiment of this invention. It is a schematic sectional drawing which shows the state which attached the impeller which concerns on 1st embodiment of this invention which comprises the centrifugal compressor of FIG. 1 to the rotating shaft. It is a schematic sectional drawing which shows the state which decomposed | disassembled the impeller of FIG. 2 and 3 show an example of an engagement structure between the main body portion and the first fixing member, (a) is a cross-sectional view taken along the line AA in FIG. 3, and (b) is a cross-sectional view in FIG. It is BB arrow sectional drawing. The impeller shown in FIGS. 2-4 shows the other example of the engagement structure of a main-body part and a 1st fixing member. The impeller shown in FIGS. 2-4 shows the other example of the engagement structure of a main-body part and a 1st fixing member. It is a schematic sectional drawing which shows the impeller and rotating shaft which concern on 2nd embodiment of this invention. It is a principal part expanded sectional view which shows the state which decomposed | disassembled the impeller of FIG. 7 and 8 show an example of an engagement structure between the main body portion and the first fixing member, (a) is a cross-sectional view taken along the line CC of FIG. 8, and (b) is a cross-sectional view of FIG. It is DD sectional view taken on the line. It is a schematic sectional drawing which shows the modification of the impeller shown in FIGS. It is a schematic sectional drawing shown in the state which decomposed | disassembled the impeller which concerns on other embodiment of this invention. It is a schematic sectional drawing which shows an example of the conventional impeller.

[First embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, a centrifugal compressor 50 that is a rotating machine of the present embodiment includes a columnar rotating shaft S that is rotated around an axis P, and a fluid that is attached to the rotating shaft S and uses centrifugal force. And a casing 53 that supports the rotation shaft S so as to be rotatable and defines a flow path 52 through which fluid flows from the upstream side to the downstream side together with the impeller 1. The rotating shaft S and the impeller 1 function as a rotor that is rotatably provided on the radially inner side of the casing 53.

The casing 53 is formed so as to form a substantially columnar outline, and the rotation axis S is disposed so as to penetrate the center. Journal bearings 54 are provided at both ends of the casing 53 in the axial direction of the rotary shaft S, and thrust bearings 55 are provided at one end. The journal bearing 54 and the thrust bearing 55 support the rotating shaft S so as to be rotatable. That is, the rotation shaft S is supported by the casing 53 via the journal bearing 54 and the thrust bearing 55.
In addition, a suction port 56 through which fluid flows in from the outside is provided on one end side in the axial direction of the casing 53, and a discharge port 57 through which fluid flows out to the outside is provided at the other end side. In the casing 53, an internal space that communicates with the suction port 56 and the discharge port 57 and repeats the diameter reduction and the diameter expansion is provided. The internal space functions as a space that houses the impeller 1 and also functions as a space that defines the flow path 52. That is, the suction port 56 and the discharge port 57 communicate with each other via the flow path 52.

A plurality of impellers 1 are arranged in the axial direction of the rotation axis S. In the illustrated example, the two adjacent impellers 1 and 1 are in contact with each other, but may be arranged with an interval in the axial direction of the rotating shaft S, for example. In the illustrated centrifugal compressor 50, six impellers 1 are provided, but at least one impeller may be provided.
Hereinafter, the configuration of each impeller 1 will be described in detail with reference to FIGS. 2 to 4. In this description, the left side of FIGS. 2 and 3 on the upstream side of the flow path 52 in the centrifugal compressor 50 shown in FIG. Is called the one side in the axial direction, and the right side of FIGS. Further, the radially outer peripheral side of each impeller 1 may be simply referred to as an outer peripheral side, and the radial inner peripheral side of the impeller 1 may be simply referred to as an inner peripheral side.

As shown in FIGS. 2 and 3, each impeller 1 includes a main body 2 and a pair of fixing members 3 and 4. The main body 2 is formed by integrally molding a disk 5, a blade 6 and a cover 7. That is, the main body 2 is configured in the same manner as the conventional impeller shown in FIG.
The disk 5 is formed in a substantially disk shape that is externally mounted on the rotation shaft S, and the cylindrical portion 11 through which the rotation shaft S is inserted, and the radially outer side of the outer peripheral surface of the cylindrical portion 11 from the other axial side portion. It is comprised by the annular disk part 12 which protrudes.
The inner diameter dimension of the cylindrical portion 11 is within a range in which the rotary shaft S can be inserted, so that the gap between the inner peripheral surface of the cylindrical portion 11 and the outer peripheral surface of the rotary shaft S is very small or the gap is eliminated. Is preferably set. That is, the inner diameter dimension of the cylindrical portion 11 is preferably set to be equal to or slightly larger than the outer diameter dimension of the rotation shaft S.

The cylindrical portion 11 has a small diameter portion 13 and an enlarged diameter portion 14.
The small diameter portion 13 is a portion including an end portion on one side in the axial direction of the cylindrical portion 11, and the outer diameter dimension of the small diameter portion 13 is constant throughout the small diameter portion 13.
On the other hand, the enlarged-diameter portion 14 is a portion arranged continuously to the other axial side of the small-diameter portion 13 and is formed so as to gradually increase in diameter toward the other axial side. That is, the outer peripheral surface 14a of the enlarged diameter portion 14 is formed to be curved so as to gradually incline toward the outer peripheral side in the radial direction toward the other side in the axial direction. Further, since the outer diameter at the end on the small diameter portion 13 side of the enlarged diameter portion 14 is the same as the outer diameter of the small diameter portion 13, the outer peripheral surface 14 a of the enlarged diameter portion 14 is the outer periphery of the small diameter portion 13. It is smoothly connected to the surface 13a.
As described above, the outer peripheral surface 11 a of the cylindrical portion 11 is constituted by the outer peripheral surface 13 a of the small diameter portion 13 and the outer peripheral surface 14 a of the enlarged diameter portion 14.

  And the surface which faces the one axial direction in the annular disk part 12 is made into the curved surface 12a which recedes gently to the other axial direction as it goes to an outer peripheral side from a radial inner peripheral side. The curved surface 12a is smoothly connected to the end portion on the other side in the axial direction of the outer peripheral surface 14a of the enlarged diameter portion 14 described above.

  The blade 6 has a curved surface of the annular disk portion 12 so as to protrude from the curved surface 12a of the annular disk portion 12 to one side in the axial direction and extend from the radially inner peripheral side of the annular disk portion 12 to the outer peripheral side. It is attached to 12a. A plurality of blades 6 are arranged at intervals in the circumferential direction of the disk 5.

The cover 7 is a member that is attached to the leading ends of the blades 6 in the protruding direction so as to cover the plurality of blades 6 from one axial side. The cover 7 includes a cover main body 15 having a disc shape centered on the same axis as the disk 5 and having a through hole 17 formed in the center in the axial direction, and an end on the radially inner peripheral side of the cover main body 15. A cylindrical edge portion 16 that rises on one side in the axial direction so that the through hole 17 extends from the portion to one side in the axial direction.
In the cover 7, a cover main body 15 is attached to the front end of the blade 6 in the protruding direction. Further, the inner peripheral surface of the through hole 17 in the cover main body 15 is opposed to the outer peripheral surface 14a of the enlarged diameter portion 14 in the disk 5 with a gap in the radial outer peripheral side. Further, the inner peripheral surface of the edge portion 16 is opposed to the outer peripheral surface 13a of the small-diameter portion 13 of the disk 5 with a space on the outer peripheral side in the radial direction.

  In the main body 2 configured as described above, the two blades 6 and 6 adjacent to each other in the circumferential direction of the disk 5 in the gap between the annular disk portion 12 of the disk 5 and the cover main body 15 of the cover 7 An insertion hole 18 extending in the radial direction of 5 is formed. Further, on the radially inner peripheral side of the insertion hole 18, a gap 19 extending in one axial direction is communicated between the cylindrical portion 11 of the disk 5 and the edge portion 16 of the cover 7. In the present embodiment, the insertion hole 18 and the gap 19 of the main body 2 define a flow path 52 in the centrifugal compressor 50 shown in FIG.

The pair of fixing members 3 and 4 are members provided so as to sandwich the main body 2 from both axial sides of the main body 2.
Here, of the pair of fixing members 3 and 4, the first fixing member 3 provided on one side in the axial direction of the disk 5 is in contact with the end on one side in the axial direction of the cylindrical portion 11 constituting the main body 2. Arranged. In the state where the first fixing member 3 is arranged in this way, the first fixing member 3 is arranged on the one axial side rather than the end on the one axial side of the main body 2, in other words, the first fixing member. 3 is not opposed to the radially inner peripheral side of the cover 7 constituting the main body 2.
On the other hand, the second fixing member 4 provided on the other side in the axial direction of the disk 5 is arranged so as to contact the end portion on the other side in the axial direction of the cylindrical portion 11. In the state in which the second fixing member 4 is arranged in this manner, the second fixing member 4 is also positioned on the other axial side of the end portion on the other axial side of the main body 2 in the same manner as the first fixing member 3 described above. Arranged.

The fixing members 3 and 4 are each formed in a cylindrical shape (annular shape) that is fitted onto the outer peripheral surface of the rotation shaft S by shrink fitting. That is, the inner diameter dimension of at least a part of each fixing member 3, 4 in the axial direction is slightly smaller than the outer diameter dimension of the rotating shaft S before each fixing member 3, 4 is heated, and The fixed members 3 and 4 are set so as to be equal to or larger than the outer diameter of the rotating shaft S in a state where the fixing members 3 and 4 are heated.
The inner diameter dimension of each of the fixing members 3 and 4 in the state before heating may be set slightly smaller than the outer diameter dimension of the rotating shaft S over the entire fixing members 3 and 4, for example, Of the fixed members 3 and 4, only the inner diameter dimension of the portion away from the cylindrical portion 11 in the axial direction is set slightly smaller than the outer diameter dimension of the rotation shaft S, and the fixed members 3 and 4 are close to the cylindrical portion 11. More preferably, the inner diameter dimension of the portion is equal to or greater than the outer diameter dimension of the rotary shaft S.

In addition, the first fixing member 3 is arranged on the one side in the axial direction from the end portion on the one side in the axial direction of the main body 2 in the state where the first fixing member 3 is fitted to the rotation shaft S as described above. Therefore, the outer diameter dimension of the first fixing member 3 is within a range that does not interfere with the flow path 52 in the centrifugal compressor 50 and the part of the main body 2 and the casing 53 (see FIG. 1) for defining the flow path 52. It is good to set in. In the configuration shown in FIG. 2, the outer diameter of the first fixing member 3 is set so that the outer diameter of the first fixing member 3 is equal to the outer diameter of the small-diameter portion 13 constituting the main body 2. Is smoothly connected to the outer peripheral surface 13a of the small-diameter portion 13, but the outer diameter of the first fixing member 3 is set to be larger than the outer-diameter of the small-diameter portion 13 as long as it does not interfere with the above-described range. I do not care.
On the other hand, the second fixing member 4 is arranged such that the outer diameter of the second fixing member 4 does not interfere with the inner peripheral surface of the casing 53 in a state where the second fixing member 4 is fitted to the rotation shaft S. In the region, it is only necessary to set the distance smaller than the distance from the outer peripheral surface of the rotation shaft S to the inner peripheral surface of the casing 53. (See Figure 1)

Further, when a plurality of impellers 1 are arranged in the axial direction (see FIG. 1), the total axial dimension of the pair of fixing members 3 and 4 is the distance between the two main body portions 2 and 2 adjacent in the axial direction. It may be set to be as follows. That is, the second fixing member 4 constituting the impeller 1 arranged on the upstream side and the first fixing member 3 constituting the impeller 1 arranged on the downstream side are in contact with each other as shown in FIG. For example, they may be spaced apart from each other.
2 and 3, the axial dimension of the first fixing member 3 is set to be longer than the axial dimension of the second fixing member 4, but the present invention is not limited to this.

And in this embodiment, the 1st fixing member 3 (one fixing member) is engaged with the main-body part 2 so that the relative rotation around the axis | shaft of the main-body part 2 may be controlled.
More specifically, as shown in FIGS. 3 and 4A, a part of the circumferential direction of the small-diameter portion 13 constituting the main body portion 2 is opposed to the first fixing member 3 in the axial direction. Engagement convex portions 21 projecting from the surface (the surface facing the one side in the axial direction) are formed. As shown in FIG. 4A, the engagement convex portion 21 is formed in a fan shape corresponding to the annular shape of the small diameter portion 13. The circumferential length of the engaging projection 21 is set so that the opening angle of the engaging projection 21 formed in a fan shape is 90 degrees. Two engaging convex portions 21 are arranged at equal intervals in the circumferential direction of the small diameter portion 13.

  On the other hand, as shown in FIGS. 3 and 4 (b), a part of the first fixing member 3 in the circumferential direction is from a surface (a surface facing the other side in the axial direction) facing the small diameter portion 13 in the axial direction. A recessed engagement recess 22 is formed. As shown in FIG. 4B, the engagement recess 22 is formed in a fan shape corresponding to the annular shape of the first fixing member 3, as in the case of the engagement protrusion 21 described above. The circumferential length of the engagement recess 22 is also set so that the opening angle of the engagement recess 22 formed in a fan shape is 90 degrees. Furthermore, two engaging recesses 22 are arranged at equal intervals in the circumferential direction of the first fixing member 3.

  By forming the engagement convex portion 21 and the engagement concave portion 22 in this manner, the first fixing member 3 is disposed so as to contact the end portion on the one axial side of the cylindrical portion 11 forming the main body portion 2. In the state, since the engagement convex portion 21 of the small diameter portion 13 is inserted into the engagement concave portion 22 of the first fixing member 3, the main body portion 2 and the first fixing member 3 are engaged with each other. The relative rotation around the axis with the main body 2 is restricted. In particular, in this embodiment, since the circumferential lengths of the engaging convex portion 21 and the engaging concave portion 22 are set to be equal to each other, when the engaging convex portion 21 is inserted into the engaging concave portion 22, the first The relative rotation around the axis between the fixing member 3 and the main body 2 is prevented.

Next, an example of an attachment method for attaching the impeller 1 having the above-described configuration to the rotation shaft S will be described.
First, for example, as shown in FIG. 2, the first fixing member 3 is fixed to the rotating shaft S by fitting the first fixing member 3 to the rotating shaft S by shrink fitting. At this time, the first fixing member 3 may be heated to increase the inner diameter of the first fixing member 3 and then the rotation shaft S may be inserted through the first fixing member 3. Then, the first fixing member 3 is cooled and reduced in diameter so that the inner peripheral surface of the first fixing member 3 is brought into close contact with the outer peripheral surface of the rotating shaft S, whereby the first fixing member 3 is integrated with the rotating shaft S. Fixed.

Next, the main body 2 is arranged such that one side in the axial direction of the main body 2 (the part on which the engaging convex 21 is formed) faces the first fixing member 3 (the surface on the side on which the engaging concave 22 is formed). The main body 2 is attached to the rotation shaft S by inserting the rotation shaft S through the cylindrical portion 11. In this case, the main body portion 2 may be engaged with the first fixing member 3 by inserting the engaging convex portion 21 of the main body portion into the engaging concave portion 22 of the first fixing member 3.
Finally, the second fixing member 4 is fitted to the rotating shaft S by shrink fitting so that the second fixing member 4 is arranged on the other side in the axial direction of the main body 2. Is fixed to the rotation axis S. At the time of fixing, the second fixing member 4 is integrally fixed to the rotation shaft S by heating and cooling in the same manner as the first fixing member 3. Thereby, attachment of the impeller 1 with respect to the rotating shaft S is completed.

Finally, in the step of fixing the second fixing member 4, the main body 2 is held by the second fixing member 4 or the like so that the main body 2 is sandwiched from the axial direction by the pair of fixing members 3 and 4. However, for example, the axial direction of the rotation axis S is directed in the vertical direction so that the first fixing member 3 and the main body 2 are arranged from the lower side to the upper side in the vertical direction. Is more preferable.
If the axial direction of the rotation axis S is oriented in the vertical direction, the main body 2 is pressed against the first fixing member 3 by its own weight, so that the main body 2 is easily and reliably held between the pair of fixing members 3 and 4. be able to. Further, along with this, the positional accuracy in the axial direction of the main body 2 can be improved. Further, the fact that the main body 2 is pressed against the first fixing member 3 by its own weight is particularly effective when the main body 2 is large and heavy.

  In addition, in the mounting method of the impeller 1 mentioned above, although the 1st fixing member 3, the main-body part 2, and the 2nd fixing member 4 are attached in order with respect to the rotating shaft S, for example, the 2nd fixing member 4, the main-body part You may attach 2 and the 1st fixing member 3 in order.

In the state where the impeller 1 is attached to the rotation shaft S, the main body 2 is sandwiched between the pair of fixing members 3 and 4, so that the main body 2 can be prevented from moving in the axial direction with respect to the rotation shaft S.
Further, the first fixing member 3 is not only fixed to the rotation shaft S by shrink fitting, but also engaged with the main body 2 so as to restrict the relative rotation around the axis of the main body 2, so that the main body Even if 2 is not firmly fixed to the rotating shaft S by shrink fitting or the like, the main body 2 can be reliably rotated integrally with the rotating shaft S.

As described above, according to the impeller 1 and the centrifugal compressor 50 of the present embodiment, the volume of the pair of fixing members 3 and 4 is set smaller than that of the main body 2. The heat capacity of 4 is smaller than that of the main body 2. Therefore, when the impeller 1 is attached to the rotating shaft S, only the pair of fixing members 3 and 4 having a small heat capacity need be heated and shrink-fitted onto the rotating shaft S, so that temperature control during heating is easily performed. be able to. That is, the impeller 1 can be easily attached to the rotating shaft S.
In addition, since the pair of fixing members 3 and 4 having a smaller heat capacity compared to the main body 2 can be heated in a short time, it is possible to shorten the construction time for attaching the impeller 1 to the rotating shaft S.

  Further, in the impeller 1 of the present embodiment, when only the inner diameter dimension of each of the fixing members 3 and 4 away from the cylindrical portion 11 in the axial direction is set slightly smaller than the outer diameter dimension of the rotating shaft S. Even if each fixing member 3, 4 heated at the time of shrink fitting is in contact with the axial end of the cylindrical portion 11, the portion of each fixing member 3, 4 that is separated from the cylindrical portion 11 in the axial direction Heat becomes difficult to escape to the cylindrical portion 11 side. For this reason, even when the fixing members 3 and 4 are in contact with the cylindrical portion 11 during shrink fitting, the position adjustment of the fixing members 3 and 4 with respect to the rotation shaft S and the main body portion 2 can be easily performed. Is possible.

In addition, the circumferential direction length of the engaging convex part 21 formed in the main-body part 2, the engaging concave part 22 formed in the 1st fixing member 3, the number arranged in the circumferential direction, etc. are the said 1st embodiment. It should just be set so that at least the engaging convex part 21 can be inserted in the engaging concave part 22.
Therefore, the circumferential length of the engaging convex portion 21 formed in the small-diameter portion 13 is such that the opening angle of the engaging concave portion 22 formed in a fan shape is 45 degrees as shown in FIG. 5A, for example. The four engaging projections 21 may be arranged at equal intervals in the circumferential direction of the small-diameter portion 13. The circumferential length of the engaging convex portion 21 formed in the small diameter portion 13 is such that the opening angle of the engaging concave portion 22 formed in a fan shape is 180 degrees as shown in FIG. 5B, for example. And only one engagement convex portion 21 may be provided. Even in these cases, the engaging concave portion 22 on the first fixing member 3 side is formed so as to correspond to the engaging convex portion 21 shown in FIGS. 5A and 5B, similarly to the first embodiment. Just do it.

Moreover, the circumferential direction length of the engaging convex part 21 may not be equivalent to the engaging recessed part 22, for example, may be shorter than the engaging recessed part 22. FIG.
Furthermore, in the engagement structure of the first embodiment, the engagement convex portion 21 is formed on the small diameter portion 13 constituting the main body portion 2, and the engagement concave portion 22 is formed on the first fixing member 3. In addition, an engagement convex portion may be formed on the first fixing member 3, and an engagement concave portion may be formed on the small diameter portion 13.

  Further, the structure in which the first fixing member 3 is engaged with the main body 2 so as to restrict the relative rotation of the first fixing member 3 and the main body 2 around the axis is the same as the first embodiment. For example, as shown in FIG. 6, the insertion grooves 23 and 24 formed in the small diameter portion 13 and the first fixing member 3, and both of the insertion grooves 23 are not limited to those using the recess 22 and the engagement protrusion 21. , 24 may be used. That is, in the configuration shown in FIG. 6, insertion grooves 23 and 24 that are recessed from surfaces facing each other are formed in a part of each of the small diameter portion 13 and the first fixing member 3 in the circumferential direction. The same insertion piece 25 enters the insertion grooves 23 and 24 in a state where the opposing surfaces of the small diameter portion 13 and the first fixing member 3 are in contact with each other.

  When the engagement structure as shown in FIG. 6 is employed, at least in the state where the main body 2 is sandwiched between the pair of fixing members 3 and 4, the insertion piece 25 is inserted into the two insertion grooves 23 and 24. It is preferable that the main body 2 and the first fixing member 3 are sandwiched, or the insertion piece 25 is fixed to the insertion groove 24 of the first fixing member 3 by shrink fitting. By doing in this way, it can prevent reliably that the insertion piece 25 remove | deviates from the main-body part 2 and the 1st fixing member 3. FIG.

  Further, the shape and size of each of the insertion grooves 23 and 24 and the insertion piece 25 are not limited to a rectangular shape as shown in FIG. 6, and at least the same insertion piece 25 is inserted into both the insertion grooves 23 and 24 at the same time. As described above, it is only necessary that the insertion grooves 23 and 24 and the insertion piece 25 have shapes and sizes corresponding to each other. Therefore, the shape and size of the two insertion grooves 23 and 24 may be set equally between the small diameter portion 13 and the first fixing member 3 as shown in FIG. 6, for example, but are set different from each other, for example. May be.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS. In this embodiment, parts that are the same as the components of the impeller of the first embodiment are given the same reference numerals, and descriptions thereof are omitted.
As shown in FIGS. 7 and 8, the impeller 30 according to the present embodiment is configured by a main body 2 and a pair of fixing members 3 and 4, similarly to the impeller 1 of the first embodiment. The main body 2 is formed by integrally molding a disk 5, a blade 6 and a cover 7.

In the impeller 30 of the present embodiment, the first fixing member 3 is disposed so as to contact the end portion on the one axial side of the cylindrical portion 31 constituting the disk 5. It differs from the impeller 1 of 1st embodiment by the point that it arrange | positions at intervals at the radial direction inner peripheral side.
More specifically, the disk 5 of the present embodiment is formed in a substantially disk shape that is externally mounted on the rotary shaft S, as in the first embodiment, and a cylindrical portion 31 through which the rotary shaft S is inserted, and a cylinder An annular disk part 32 is provided to project radially outward from the outer peripheral surface of the part 31, and the annular disk part 32 has the same shape as the annular disk part 12 of the first embodiment.

  On the other hand, the cylindrical portion 31 does not include the small diameter portion 13 and the large diameter portion 14 of the cylindrical portion 11 of the first embodiment. In other words, the disk 5 of this embodiment is formed such that the annular disk portion 32 projects from the entire outer peripheral surface of the cylindrical portion 31. As a result, in the disk 5 of the present embodiment, at least one portion on the one axial side of the end portion on the radially inner peripheral side of the cover 7 and the end portion on the radially inner peripheral side of the blade 6 is further radially inward. There are no other components on the circumferential side.

The first fixing member 3 is formed in the same cylindrical shape as that in the first embodiment, and has the same inner diameter as that in the first embodiment so as to be fitted to the rotation shaft S by shrink fitting. However, it has the small diameter part 33 and the large diameter part 34 similar to the small diameter part 13 and the large diameter part 14 of the cylindrical part 11 in the first embodiment.
That is, the small-diameter portion 33 is a portion including an end portion on one side in the axial direction of the first fixing member 3. The outer peripheral surface 33a of the small diameter portion 33 is the same as that of the first embodiment between the cover 7 and the small diameter portion 33 in a state where the main body portion 2 and the first fixing member 3 are attached to the rotation shaft S as shown in FIG. It is formed in the same shape and size as the outer peripheral surface 13a of the small diameter portion 13 of the first embodiment so that the same gap 19 is formed.

On the other hand, the enlarged diameter portion 34 is a portion arranged continuously to the other axial side of the small diameter portion 33. The outer peripheral surface 34a of the enlarged diameter portion 34 is connected to the curved surface 32a of the annular disk portion 32 in a state where the main body portion 2 and the first fixing member 3 are attached to the rotation shaft S, so that the outer peripheral surface 34a of the first embodiment is smoothly connected. It is formed in the same shape and size as the outer peripheral surface 14 a of the enlarged diameter portion 14.
In addition, the shape of the 2nd fixing member 4 in this embodiment, a magnitude | size, arrangement | positioning with respect to the cylindrical part 31, etc. are all the same as that of the 2nd fixing member 4 in 1st embodiment.

  In the present embodiment, as in the first embodiment, the first fixing member 3 (one fixing member) is engaged with the main body 2 so as to restrict relative rotation around the axis of the main body 2. It is configured as follows. In addition, although this engagement structure may be simply comprised only by the engagement convex part 21 and the engagement recessed part 22 similar to 1st embodiment, it may be comprised as shown, for example in FIG. .

That is, as shown in FIGS. 8 and 9 (a), the cylindrical portion 31 has a radially inner peripheral side of a surface (a surface facing the one side in the axial direction) opposed to the first fixing member 3 in the axial direction. An annular convex portion 35 is formed so as to protrude from the region to one side in the axial direction. That is, the surface of the cylindrical portion 31 facing the one axial side is formed with a step in the axial direction between the radially inner peripheral region and the radially outer peripheral region. And in this embodiment, the engagement convex part 41 which protrudes from the front end surface of the cyclic | annular convex part 35 which faces an axial direction one side is formed in a part of circumferential direction of this cyclic | annular convex part 35. As shown in FIG.
In addition, the shape of the engagement convex part 41, the circumferential direction length, etc. are the same as that of the engagement convex part 21 of 1st embodiment. That is, as shown in FIG. 9A, the engagement convex portion 41 is formed in a fan shape corresponding to the annular shape of the annular convex portion 35, and the circumferential length of the engagement convex portion 41 is the engagement convex portion. The opening angle of the portion 41 is set to 90 degrees. In addition, two engaging convex portions 41 are arranged at equal intervals in the circumferential direction of the annular convex portion 35.

  On the other hand, as shown in FIGS. 8 and 9B, the first fixing member 3 has a radially inner peripheral side of a surface (a surface facing the other side in the axial direction) opposed to the cylindrical portion 31 in the axial direction. An annular recess 36 is formed which is recessed from the region to one side in the axial direction. That is, the surface of the first fixing member 3 facing the other side in the axial direction is formed with a step in the axial direction between the radially inner peripheral region and the radially outer peripheral region. The inner diameter dimension of the annular recess 36 is set to be equal to or larger than the outer diameter dimension of the annular protrusion 35 so that the annular protrusion 35 can be inserted. The depth of the annular recess 36 is such that, with the annular protrusion 35 inserted, the radially outer regions of the cylindrical portion 31 and the first fixing member 3 facing each other in the axial direction are in contact with each other. Thus, it is set to be longer than the protruding length of the annular convex portion 35.

  In the present embodiment, an engagement recess 42 that is recessed from the bottom surface of the annular recess 36 facing the other side in the axial direction is formed in a part of the annular recess 36 in the circumferential direction. The shape and circumferential length of the engagement recess 42 are the same as those of the engagement recess 22 of the first embodiment. That is, as shown in FIG. 9B, the engagement recess 42 is formed in a fan shape corresponding to the annular shape of the annular recess 36, and the circumferential length of the engagement recess 42 is the opening of the engagement recess 42. The angle is set to 90 degrees. Two engaging recesses 42 are arranged at equal intervals in the circumferential direction of the annular recess 36.

  By forming the annular convex portion 35, the annular concave portion 36, the engaging convex portion 41, and the engaging concave portion 42 in this way, the first fixing member is provided at the end portion on one axial side of the cylindrical portion 31 forming the main body portion 2. 3, the annular convex portion 35 of the cylindrical portion 31 is inserted into the annular concave portion 36 of the first fixing member 3, and the engaging convex portion 41 of the cylindrical portion 31 is first fixed. The member 3 is inserted into the engaging recess 42. Therefore, as in the case of the first embodiment, the main body 2 and the first fixing member 3 are engaged, and relative rotation about the axis between the first fixing member 3 and the main body 2 is restricted. Become.

The impeller 30 of the present embodiment configured as described above can be attached to the rotating shaft S by the same attachment method as in the first embodiment.
When the impeller 1 is attached to the rotation shaft S, the main body 2 is sandwiched between the pair of fixing members 3 and 4 and the main body 2 is axially oriented with respect to the rotation shaft S, as in the first embodiment. Can be prevented from moving to. In this state, the first fixing member 3 is not only fixed to the rotation shaft S by shrink fitting, but also engaged with the main body 2 so as to restrict relative rotation around the axis of the main body 2. Therefore, the main body 2 can be reliably rotated integrally with the rotation shaft S.

As mentioned above, according to the impeller 30 of this embodiment, there exists an effect similar to 1st embodiment.
Furthermore, in the impeller 30 of the present embodiment, the first fixing member 3 is disposed on the radially inner peripheral side of the cover 7 and the blade 6, and the first fixing member 3 is disposed on the one side in the axial direction from the main body 2. It does not protrude. That is, since the first fixing member 3 of the present embodiment constitutes a part of the main body 2 of the first embodiment, the axial dimension of the impeller 30 can be shortened. In particular, when a plurality of impellers 30 are arranged in the axial direction of the rotation axis S, the arrangement length can be set short. Therefore, the axial dimension of the rotating shaft S can be set short, and as a result, the rigidity of the rotating shaft S can be improved.

  Further, when manufacturing the main body 2 in which the disk 5, the blade 6 and the cover 7 are integrally molded, when the above-described insertion hole 18 is formed by machining such as machining or electric discharge machining, the cutting processing tool has a diameter. It is necessary to insert into the insertion hole 18 from the inner side in the direction. Here, in the main body 2 of the present embodiment, at least one of the end portions on the radially inner peripheral side of the cover 7 and the end portion on the radially inner peripheral side of the blade 6 in the radial direction is further radial. Since there are no other components on the inner peripheral side, the processing tool can be easily inserted into the insertion hole 18 from the inner peripheral side in the radial direction. That is, the main body 2 can be easily manufactured.

Further, according to the impeller 30 of the present embodiment, the engaging convex portion 41 is formed on the tip surface of the annular convex portion 35 and the engaging concave portion 42 is formed on the bottom surface of the annular concave portion 36. Even if the cylindrical portion 31 and the engaging convex portion 41 and the engaging concave portion 42 are formed, the curved surface 32a of the disk 5 and the first fixed portion with the main body portion 2 and the first fixing member 3 attached to the rotating shaft S. The length of the boundary line between the disk 5 and the first fixing member 3 that appears between the outer peripheral surface 34a of the member 3 can be made shorter than in the case of the first embodiment.
And the structure (especially structure which forms the annular recessed part 35 and the annular convex part 36) of said 2nd embodiment can be applied in combination with the structure shown in FIGS. 1-6 suitably.

  In the second embodiment, the inner diameter of the annular recess 36 in the first fixing member 3 is set to be equal to or greater than the outer diameter of the annular protrusion 35 in the cylindrical portion 31 so that the annular protrusion 35 can be inserted. However, it is not limited to this. That is, the inner diameter of the annular recess 36 is set such that, for example, when the first fixing member 3 is fitted to the rotation shaft S by shrink fitting, the inner circumferential surface of the annular recess 36 is pressed against the outer circumferential surface of the annular projection 35. Thus, it may be set slightly smaller than the outer diameter dimension of the annular convex portion 35.

Furthermore, in the engagement structure of the second embodiment, the engagement protrusion 41 is formed in the annular protrusion 35 and the engagement recess 42 is formed in the annular recess 36. A convex portion may be formed, and an engaging concave portion may be formed in the annular convex portion 35.
In the second embodiment, the annular protrusion 35 is formed in the cylindrical portion 31 and the annular recess 36 is formed in the first fixing member 3. For example, the annular recess is formed in the cylindrical portion 31. An annular convex portion may be formed on the first fixing member 3.

Further, in the second embodiment, the first fixing member 3 is disposed to face the radially inner peripheral side of the cover 7 and the blade 6, but for example, as shown in FIG. It may be formed so as to face only the edge 16) of the cover 7. Further, the first fixing member 3 is not limited to be disposed so as not to protrude from the end portion on the one axial side of the main body portion 2 as in the second embodiment. For example, as shown in FIG. A part of the one fixing member 3 may protrude from the end of one side of the main body 2 in the axial direction.
Even in the configuration shown in FIG. 10, a part of the first fixing member 3 is arranged on the other axial side than the end on the one axial side of the main body 2, that is, the first fixing member. Since a part of 3 is accommodated in the main body 2, the axial dimension of the impeller can be shortened. Therefore, the same effect as the second embodiment is achieved.

Similarly to the case of the first fixing member 3, for example, as shown in FIG. 10, a part or the whole of the second fixing member 4 may be accommodated in the main body 2. In this case, for example, an annular insertion hole 45 that is recessed from the surface facing the other side in the axial direction is formed in the cylindrical portion 31, and a part or the whole of the second fixing member 4 is placed in the insertion hole 45. Insert it.
Even in such a configuration, as in the case of the first fixing member 3 described above, the length of the second fixing member 4 protruding from the main body portion 2 to the other side in the axial direction can be shortened, or Since it can prevent that the 2nd fixing member 4 protrudes from the main-body part 2, it becomes possible to shorten the axial direction dimension of an impeller.

In the configuration in which the insertion hole 45 is formed as shown in FIG. 10, for example, the radial dimension of the inner peripheral surface of the insertion hole 45 is equal to that of the second fixing member 4 regardless of whether the second fixing member 4 is heated. It is preferably set to be larger than the diameter of the outer peripheral surface. In other words, a gap may be formed between the outer peripheral surface of the second fixing member 4 and the inner peripheral surface of the insertion hole 45 with the second fixing member 4 inserted into the insertion hole 45.
With this configuration, the outer peripheral surface of the second fixing member 4 contacts the inner peripheral surface of the insertion hole 45 even when the second fixing member 4 heated during shrink fitting is inserted into the insertion hole 45. Since the contact area of the 2nd fixing member 4 and the cylindrical part 31 can be restrained small, the heat of the 2nd fixing member 4 becomes difficult to escape to the cylindrical part 31 side. For this reason, it is possible to easily adjust the position of the second fixing member 4 with respect to the rotation shaft S and the main body 2 during shrink fitting.
Thus, the structure which accommodates the 2nd fixing member 4 in the insertion hole 45 of the main-body part 2 may be applied to the impeller 1 of 1st embodiment.

Although the details of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
For example, in all the embodiments described above, only the structure in which the first fixing member 3 is engaged with the main body portion 2 has been described. However, all the engagement structures described above may be applied to the second fixing member 4, for example. Good.

  That is, for example, as shown in FIG. 11, a surface facing the second fixing member 4 (one fixing member) in the axial direction at a part in the circumferential direction of the cylindrical portion 11 (a surface facing the other side in the axial direction). An engagement recess 47 that is recessed from the surface is formed, and a part of the second fixing member 4 in the circumferential direction is opposed to a surface that faces the cylindrical portion 11 in the axial direction (a surface that projects from one surface in the axial direction). You may form the joint convex part 48. In addition, the shape of these engagement recessed parts 47 and the engagement convex part 48, an axial direction dimension, the circumferential direction length, the number arranged in the circumferential direction, etc. are engagement convex parts. What is necessary is just to set like embodiment mentioned above so that 48 can be inserted in the engagement recessed part 47. FIG.

In the configuration as shown in FIG. 11, when the impeller is attached to the rotation shaft S, the engaging convex portion 48 is inserted into the engaging concave portion 47 so that the main body portion 2 and the second fixing member 4 are engaged. Thus, the relative rotation around the axis between the second fixing member 4 and the main body 2 is restricted. As a result, the main body 2 can be reliably rotated integrally with the rotation shaft S.
The main body 2 is not limited to being engaged with only one of the pair of fixing members 3 and 4 as in the configuration shown in FIGS. 4 may be engaged.

In all the above-described embodiments, the main body 2 is not directly fixed to the rotation axis S. For example, the cylindrical portion 11 (31) is rotationally fitted to the rotation axis S by shrink fitting similarly to the fixing members 3 and 4. You may fix by making it fit. In this case, since the gap between the inner peripheral surface of the main body 2 (cylindrical portion 11 (31)) and the outer peripheral surface of the rotary shaft S is surely eliminated, the rotary shaft S is rotated in the centrifugal compressor 50. At this time, it is possible to prevent the main body 2 from vibrating with respect to the rotation axis S based on the above-described gap.
When the main body 2 is fitted to the rotation shaft S for the purpose of preventing or suppressing the vibration of the main body 2, the tightening force of the rotation shaft S by the main body 2 is greater than the tightening force by the fixing members 3 and 4. Can also be weak. That is, the inner diameter of the cylindrical portions 11 and 31 in the main body 2 may be set to be larger than the inner diameter of the fixing members 3 and 4 and smaller than the outer diameter of the rotation shaft S. By setting in this way, the main body 2 can be easily fitted to the rotary shaft S as compared with the conventional case where the impeller needs to be firmly fixed by shrink fitting.

Moreover, although the main-body part 2 of the said embodiment is provided with the cover 7, it should just be provided with the disk 5 and the blade 6 at least.
Furthermore, in the centrifugal compressor 50 of the above embodiment, each impeller 1 includes a pair of fixing members 3 and 4, but a plurality of impellers 1 are arranged in the axial direction of the rotation shaft S as shown in FIG. 1. In this case, between the two main body portions 2 and 2 adjacent to each other, the two fixing members 3 and 4 are not limited to being arranged in the axial direction, and for example, only one fixing member may be disposed. In other words, the two fixing members 3 and 4 positioned between the two main body portions 2 and 2 adjacent to each other may be integrally formed as one member.

When only one fixing member is arranged between the two main body portions 2 and 2 as described above, the number of fixing members constituting the centrifugal compressor 50 is reduced. In addition, it is possible to reduce the number of steps for attaching the plurality of impellers 1 to the rotation shaft S (particularly, the number of operations for shrink-fitting the fixing member to the rotation shaft S).
Further, since the interval between the two main body portions 2 and 2 adjacent in the axial direction can be set only by the axial dimension of one fixing member, the two fixing members 3 and 4 are interposed between the two main body portions 2 and 2. Compared with the case where the two are arranged, the interval between the two main body portions 2 and 2 can be set easily and accurately, and can be maintained appropriately.

  The present invention is not limited to being applied to the centrifugal compressor 50 as in the above embodiment, but can be applied to rotating machines such as a compressor and a turbine.

DESCRIPTION OF SYMBOLS 1,30 ... Impeller, 2 ... Main-body part, 3 ... 1st fixing member, 4 ... 2nd fixing member, 5 ... Disc, 6 ... Blade, 7 ... Cover, 21, 41, 48 ... Engagement convex part, 22, 42, 47 ... engaging recess, 23, 24 ... insertion groove, 25 ... insertion piece, 45 ... insertion hole, 50 ... centrifugal compressor (rotary machine), 52 ... flow path, 53 ... casing, S ... rotating shaft, P ... Axis

Claims (9)

A disk-shaped disk that is externally mounted on a rotating shaft, and is attached to a surface facing one side in the axial direction of the disk so as to extend from the radially inner peripheral side to the outer peripheral side of the disk and in the circumferential direction of the disk A main body having a plurality of blades arranged;
A pair of fixing members that are formed in an annular shape that is fitted into the outer peripheral surface of the rotating shaft by shrink fitting, and are provided so as to sandwich the main body portion from both axial sides of the main body portion,
At least one of the pair of fixing members is engaged with the main body so as to restrict relative rotation around the axis of the main body. The main body includes a cover that covers the plurality of blades from one side in the axial direction,
The first fixing member provided on one side in the axial direction of the disc among the pair of fixing members is disposed with a space on the radially inner peripheral side of the cover. Impeller.   The first fixing member provided on one side in the axial direction of the disk among the pair of fixing members is disposed at an interval on the radially inner peripheral side of the blade. The impeller according to 2. An annular insertion hole that is recessed from the surface facing the other side in the axial direction is formed in the disk,
The second fixing member provided on the other side in the axial direction of the disk among the pair of fixing members is inserted into the insertion hole. Impeller.   5. The pair of fixing members according to claim 1, wherein the pair of fixing members are engaged with the main body so as to restrict relative rotation around the axis of the main body, respectively. Impeller. An engagement recess is formed in a part of the circumferential direction of one of the fixing member and the main body, and is recessed from a surface facing the other of the fixing member and the main body.
The impeller according to any one of claims 1 to 5, wherein an engaging convex portion that can be inserted into the engaging concave portion is formed on the other of the fixing member and the main body portion. Insertion grooves that are recessed from surfaces facing each other are formed in a part of the circumferential direction of each of the fixing member and the main body,
The impeller according to any one of claims 1 to 6, wherein the same insertion piece is inserted into the insertion grooves of both the fixing member and the main body portion. A rotation axis;
The impeller according to any one of claims 1 to 7,
A rotating machine comprising: a casing that rotatably supports the rotating shaft and that defines a flow path for flowing a fluid from the upstream side to the downstream side together with the impeller. A plurality of the impellers are arranged in the axial direction of the rotating shaft,
The rotating machine according to claim 8, wherein the two fixing members positioned between the two main body portions adjacent in the axial direction are integrally formed.

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