WO2017149865A1

WO2017149865A1 - Rotating machine and method for producing rotating machine

Info

Publication number: WO2017149865A1
Application number: PCT/JP2016/084900
Authority: WO
Inventors: 伸 ▲柳▼沢; 栄一柳沢; 中庭　彰宏; 伸一郎得山
Original assignee: 三菱重工コンプレッサ株式会社; 三菱重工業株式会社
Priority date: 2016-03-01
Filing date: 2016-11-25
Publication date: 2017-09-08
Also published as: JP2017155640A

Abstract

This rotating machine has a stopper (11) for blocking a through-hole (10) that passes through at least one element among a disc (3), a cover (4), and a blade, and is provided so as to connect to a space surrounded by the disc (3), cover (4) and blade. The stopper (11) is shaped in a manner such that the cross-section thereof that intersects the through direction in which the through-hole (10) penetrates gets gradually smaller toward the direction (direction of arrow B1) in which an external force acts on the disc (3), cover (4) and blade.

Description

Rotating machine and method of manufacturing rotating machine

The present invention relates to a rotating machine applied to an impeller such as a supercharger, a gas turbine, an industrial compressor, a centrifugal compressor, or a pump, and a method of manufacturing the rotating machine.
This application claims priority on Japanese Patent Application No. 2016-039260 filed on Mar. 1, 2016, the contents of which are incorporated herein by reference.

For example, in the field of a centrifugal compressor operated in a corrosive environment such as a chemical process using a corrosive gas as a working fluid, there is no weld from the viewpoint of increasing the flow rate of the working fluid and preventing corrosion due to the working fluid. A piece impeller is desired. That is, it is desirable to form a predetermined shape from a base material made of a corrosion-resistant metal by machining or the like.

For example, in the three-dimensional impeller disclosed in Patent Document 1, a plurality of impeller parts having a shape obtained by dividing the impeller on a surface in a direction intersecting with the rotation shaft of the impeller is formed. In addition, this three-dimensional impeller has a divided structure for assembling these impeller components. These divided impeller parts are integrated by diffusion bonding or brazing via a contact surface.
However, in such a divided structure, the reliability based on the viewpoint of increasing the flow rate of the working fluid and preventing corrosion by the working fluid is reduced. In addition, an assembly error during manufacturing increases. For this reason, Patent Document 2 proposes an integral structure that does not cause problems due to the divided structure.

The impeller for a centrifugal compressor shown in Patent Document 2 is a structure in which a plurality of blades, a main body arranged at the root of the blade, and a shroud arranged at the tip of the blade are integrated. is there. In the centrifugal compressor impeller, slits that penetrate the shroud in the thickness direction of the shroud along the circumferential direction, or a plurality of holes that penetrate the shroud in the thickness direction of the shroud are formed in the shroud. .

JP 2004-308647 A JP 2009-156122 A

However, although the rotary machine shown in Patent Document 2 is integrally structured, slits or holes formed during processing remain. Therefore, in this rotating machine, there is a possibility that reliability of strength and hydrodynamic performance is reduced.
Moreover, in the rotary machine shown by patent document 2, the big slit which penetrates to a plate | board thickness direction along the circumferential direction remains in a shroud. Therefore, in this rotating machine, there is a possibility that reliability of strength and hydrodynamic performance is reduced.

The present invention can be formed in a single structure, thereby preventing a decrease in the reliability of strength and hydrodynamic performance and improving the mechanical reliability, and a method of manufacturing the rotating machine I will provide a.

A rotating machine according to a first aspect of the present invention includes a disk that is rotatably provided integrally with a shaft body, a cover that is provided between the disk in an axial direction and a radial direction, and these disks. A plurality of blades provided between the cover and guiding fluid between the disks and the cover to the outside, and penetrating through at least one of the disk, the cover, and the blade; And a plug body closing a through hole communicating with the internal space surrounded by the blade, the plug body penetrating the through hole in a direction in which an external force acts on the disk, the cover and the blade. The cross section that intersects the penetrating direction is formed into a shape that gradually decreases.

According to such a configuration, the through hole that leads to the internal space surrounded by the disk, the cover, and the blade is provided. Therefore, the rotary tool can be inserted into the internal space through this through hole. Therefore, machining with the rotary tool can be performed in a region of the internal space that is difficult to reach from the outside by the rotary tool.
As a result, it is possible to easily form a rotary machine such as an impeller having an integral structure by machining from a block-shaped base material, and it is possible to keep the machining cost related to the region low.
In addition, the through hole leading to the internal space of the disk, cover, and blade is filled with a plug. For this reason, the entire structure is integrally formed by the plug body, and it becomes possible to prevent the reliability of the strength and hydrodynamic performance of the rotating machine from being lowered during the subsequent use of the rotating machine.
Moreover, it is a simple structure which has a through-hole connected to the internal space enclosed by the disk, the cover, and the blade, and a plug that fills the through-hole. Therefore, the influence on the flow path formed in the internal space and the ratio occupied by the joint surface of the plug body can be minimized.
Further, the cross-section intersecting the penetration direction is gradually reduced toward the direction in which the external force (that is, centrifugal force, fluid supply pressure) applied to the disc, the cover, and the blade acts by the plug body. Therefore, the plug is pushed into the through hole by an external force applied as the rotating machine rotates. As a result, it is possible to prevent the plug body from falling off, maintain the integral structure of the entire rotating machine (that is, a one-piece closed impeller), and prevent deterioration of the strength and hydrodynamic performance of the rotating machine. It becomes possible.

In the rotating machine according to the second aspect of the present invention, in the first aspect, the through hole may be formed in a shape that penetrates the disk and gradually decreases in cross section in the direction of centrifugal force applied to the disk.

In the rotating machine according to the third aspect of the present invention, in the first aspect, the through hole may be formed in a shape that gradually penetrates the cover and gradually decreases in cross section in the direction of centrifugal force applied to the cover.

In the rotating machine according to the fourth aspect of the present invention, in the first aspect, the through hole may be formed in a shape that penetrates the blade and gradually decreases in cross section in the direction of centrifugal force applied to the blade.

According to the configuration as described above, the through hole penetrating the disk / cover / blade is formed in a shape in which the cross section gradually decreases in the direction of the centrifugal force applied to the disk. For this reason, the plug body is pushed into the through-hole by an external force applied in association with the rotation, so that the entire rotary machine can be formed into an integral structure (that is, a one-piece closed impeller).

In the rotating machine according to the fifth aspect of the present invention, in any one of the first to fourth aspects, a notch is provided at an edge of the blade located at the inlet or outlet of the flow path serving as the internal space. A hole filling member for closing the notch portion may be fixed to the edge portion of the blade.

According to the above configuration, the notch is formed at the edge of the blade located at the inlet or outlet of the flow path serving as the internal space. Therefore, the rotary tool can be inserted into the internal space through the notch, and machining with the rotary tool can be performed in an area of the internal space that is difficult to reach from the outside by the rotary tool.
Furthermore, since the hole filling member is fixed to the edge of the blade so as to cover the notch after machining with the rotary tool, the hole filling member can serve to supplement the shape of the impeller.

In the rotary machine according to the sixth aspect of the present invention, in the fifth aspect, the hole filling member is formed with a tapered surface so that a contact force with the blade is increased by an external force applied to the blade. .

According to the configuration as described above, the tapered surface is formed on the hole filling member so that the contact force with the blade is increased by the external force applied to the blade. Therefore, the hole-filling member can be brought into close contact with the edge of the blade by an external force applied as the impeller rotates, thereby contributing to the integral structure of the impeller.

In the rotating machine according to the seventh aspect of the present invention, in the first aspect, the through hole is provided through the plurality of blades arranged along the rotation direction of the shaft body.

According to the above configuration, the through hole is provided through the plurality of blades arranged along the rotation direction of the shaft body. Therefore, machining with the rotary tool can be performed in the region of the internal space that is difficult to reach from the outside by the rotary tool inserted through the through hole.

A method for manufacturing a rotary machine according to an eighth aspect of the present invention includes a disk that is rotatably provided integrally with a shaft body, and a cover that is provided between the disk in an axial direction and a radial direction. A rotating machine manufacturing method comprising a plurality of blades provided between the disks and the cover to guide the fluid between the disks and the cover toward the outside. A disk, a cover, and a blade by inserting a rotary tool from a region corresponding to a distance between the disk and the cover in a radial direction and an axial direction. A second step of forming a part of the flow path surrounded by the disk, the flow path surrounded by the disk, the cover, and the blade. A third step of forming a through-hole having a shape in which the cross section intersecting the penetration direction gradually decreases in the direction in which the penetration acts, and a rotary tool is inserted from the through-hole, and is surrounded by the disk, the cover, and the blade, A fourth step of forming another part of the flow path that has not been processed in the second step, and a fifth step of inserting and closing the plug body in a direction in which the external force acts on the through-hole. ,including.

According to the above configuration, after the base material having the outer shape including the disk and the cover is formed in the first step, in the second or fourth step, the radial direction between the disk and the cover and The rotary tool is inserted from a region corresponding to the interval in the axial direction. Thereby, most of the flow path surrounded by the disc, the cover, and the blade is formed.
Thereafter, in the third step, the flow is communicated toward the flow path surrounded by the disk, the cover, and the blade, and the external force applied to the disk, the cover, and the blade (that is, centrifugal force, fluid supply pressure) is applied. A through hole having a shape in which a cross section intersecting with the through direction is gradually reduced is formed.
Thereafter, in the fourth or second step, the rotary tool is inserted from the through hole, and the remaining portion of the flow path surrounded by the disk, the cover, and the blade is formed. Thereafter, in the fifth step, the plug is inserted into the through hole in the direction in which the external force acts to close the through hole.
That is, according to the manufacturing method of the rotating machine having the above-described configuration, in the third step, a through-hole that leads to the internal space surrounded by the disk, the cover, and the blade is separately provided. Therefore, the rotary tool can be inserted into the internal space through the through hole in the fourth step, and machining with the rotary tool can be performed in the region of the internal space that is difficult to reach from the outside by the rotary tool.
As a result, it is possible to easily form a rotary machine such as an impeller having an integral structure by machining from a block-shaped base material, and it is possible to keep the machining cost related to the region low.
Further, in the fifth step, the through holes communicating with the internal spaces of the disk, the cover, and the blade are filled with plugs. For this reason, the whole body is integrally structured by the plug body, and it becomes possible to prevent the reliability of the strength and hydrodynamic performance of the rotating machine from being lowered during the subsequent use of the rotating machine.
Further, the cross section intersecting the penetration direction is gradually reduced toward the direction in which the centrifugal force applied to the disc, the cover and the blade becomes smaller. Therefore, the plug is pushed into the through hole by an external force applied as the rotating machine rotates. As a result, it is possible to prevent the plug body from falling off, maintain the integral structure of the entire rotating machine (that is, a one-piece closed impeller), and prevent deterioration of the strength and hydrodynamic performance of the rotating machine. It becomes possible.

In the present invention, by machining from a block-shaped base material, it is possible to easily form a rotating machine such as an impeller having an integral structure, and to reduce the machining cost related to the region of the internal space where the rotating tool is difficult to reach from the outside. It can be kept low.
Further, in the present invention, since the through hole leading to the internal space of the disk, the cover and the blade is filled with the plug body, the entire structure is integrated by the plug body, and the strength of the rotating machine when the rotating machine is used thereafter. In addition, it is possible to prevent a decrease in reliability of hydrodynamic performance.

It is a top view which shows the impeller which concerns on 1st Embodiment of this invention. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. It is a part of explanatory drawing which shows the manufacturing method of the impeller which concerns on this invention in process order. It is a part of explanatory drawing which shows the manufacturing method of the impeller which concerns on this invention in process order. It is a part of explanatory drawing which shows the manufacturing method of the impeller which concerns on this invention in process order. It is a part of explanatory drawing which shows the manufacturing method of the impeller which concerns on this invention in process order. It is a part of explanatory drawing which shows the manufacturing method of the impeller which concerns on this invention in process order. It is a part of explanatory drawing which shows the manufacturing method of the impeller which concerns on this invention in process order. It is a top view which shows the impeller which concerns on 2nd Embodiment of this invention. FIG. 5 is a sectional view taken along line VV in FIG. 4. It is a top view which shows the impeller which concerns on 3rd Embodiment of this invention. FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 6. It is a figure which shows the concave notch part formed in the edge part of a braid | blade. It is a figure which shows the hole-filling member fixed to the edge part of the braid | blade. It is a perspective view which shows the hole-filling member fixed to the edge part of the braid | blade. It is a perspective view which shows the through-hole of the impeller which concerns on 4th Embodiment of this invention. It is a top view of FIG. It is sectional drawing which shows the state of the centrifugal force added to the plug body of an impeller.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. 1, 2, 3A, 3B, 3C, 3D, 3E, and 3F.
1 and 2 show an impeller 1 of a rotary machine 100 according to the first embodiment. The impeller 1 includes a disk 3 provided so as to be rotatable integrally with the hub 2, a cover 4 provided at an interval to the disk 3, and a wing member provided between the disk 3 and the cover 4. And a plurality of blades 5.

The disk 3 is provided integrally with the hub 2. The disk 3 is fixed to a shaft body C serving as a rotating shaft via the hub 2.
The cover 4 is provided between the disk 3 at intervals in the axial direction Da and the radial direction Dr. A flow path 6 serving as an internal space is formed between the cover 4 and the disk 3. The flow path 6 is provided with the disk 3 and the cover 4 so that the interval in the axial direction Da is sequentially reduced outward in the radial direction Dr.
The blade 5 is a blade member that guides the fluid from the distance in the radial direction Dr between the disk 3 and the cover 4 to the distance in the axial direction Da between the disk 3 and the cover 4 when the disk 3 rotates. Thus, the blade 5 guides the fluid while decelerating outward in the direction of arrow A in FIGS. 1 and 2.

The cover 4 is provided with a plurality of through holes 10 that communicate with the internal space serving as the flow path 6.
These through holes 10 communicate with an internal space surrounded by the disk 3, the cover 4, and two blades 5 adjacent in the circumferential direction. In addition, a plurality of through holes 10 are provided at regular intervals in the circumferential direction around the axis O of the disk 3.
When the impeller is manufactured, a rotary tool such as an end mill can be inserted into the internal space through each through hole 10. Machining (for example, cutting or grinding) with the rotary tool can be performed in a region of the internal space that is difficult to reach from the outside by the rotary tool. As a result, in this example, the integrated impeller 1 having a complicated three-dimensional shape can be easily formed by machining from a block-shaped base material.
Further, each through hole 10 passes through the through hole 10 along a direction (arrow B1 direction) in which an external force (that is, centrifugal force, fluid supply pressure) applied to the disk 3, the cover 4, and the blade 5 acts. The cross section intersecting the penetration direction is formed in a shape that gradually decreases. Each through-hole 10 is filled and closed with a plug 11 after machining with the rotary tool described above.

The plug body 11 corresponds to the shape of the through hole 10 along the direction (arrow B1 direction) in which an external force (that is, centrifugal force, fluid supply pressure) applied to the disk 3, the cover 4, and the blade 5 acts. The cross section that intersects the penetration direction is formed in a shape that gradually decreases.
With such a configuration, the plug body 11 is pushed into the through-hole 10 by an external force applied as the impeller 1 rotates, so that the impeller 1 is integrally structured (that is, a one-piece closed impeller). it can.

The plug body 11 is elastically deformed or plastically deformed by being pushed into the through-hole 10 by applying an external force, and is brought into close contact with the inner peripheral surface of the through-hole 10.
Further, the plug body 11 described above is not limited to close contact of the plug body 11 with the through-hole 10 by elastic deformation or plastic deformation. The plug body 11 may have a female thread formed on the inner peripheral surface of the through-hole 10 and a male thread formed on the outer peripheral surface of the plug body 11 and screwed into the through-hole 10.

Next, a method for manufacturing the impeller 1 (one-piece closed impeller) that becomes the rotating machine 100 will be described with reference to FIGS. 3A to 3F.
[First step]
First, a metal block 12 as a base material shown in FIG. 3A is prepared. Thereafter, as shown in FIG. 3B, the impeller 1 is processed into an approximate shape with a rotary tool such as an end mill.

[Second step]
As shown in FIG. 3C, a rotary tool (indicated by symbol D) is inserted from a region corresponding to the distance between the disk 3 and the cover 4 in the radial direction Dr and the axial direction Da, and the disk 3 and the cover 4 are inserted. And most of the flow path 6 surrounded by the blade 5 is produced.

[Third step]
As shown in FIGS. 3D to 3E, the external force applied to the disk 3, the cover 4 and the blade 5 communicates with the flow path 6 serving as an internal space surrounded by the disk 3, the cover 4 and the blade 5 (ie, centrifugal force, A through-hole 10 having a shape in which the cross section intersecting the penetration direction gradually decreases along the direction in which the fluid supply pressure) acts (the direction of arrow B1) is formed.
The portion where the through hole 10 is formed is a portion where the flow path 6 could not be formed in the previous second step, that is, in this example, as shown in FIG. 3 and / or near the center of the flow path 6 between the covers 4.

[Fourth step]
As shown in FIG. 3E, the rotary tool D is inserted from the through hole 10 to excavate the remaining portion of the flow path 6 surrounded by the disk 3, the cover 4, and the blade 5.

[Fifth step]
As shown in FIG. 3F, the plug body 11 having a shape in which the cross section intersecting the penetration direction gradually decreases is inserted into the through hole 10 in the direction in which the external force acts (direction of arrow B1). As a result, the plug body 11 is pushed into the through-hole 10 by an external force applied as the impeller 1 rotates, so that the impeller 1 can be integrated (ie, a one-piece closed impeller).

As described above in detail, according to the first embodiment, the cover 4 is provided with the through hole 10 that leads to the internal space surrounded by the disk 3, the cover 4, and the blade 5. Therefore, the rotary tool D can be inserted into the internal space through the through hole 10, and machining with the rotary tool D can be performed in an area that is difficult to reach from the outside by the rotary tool D.
As a result, in the present embodiment, a rotary machine such as an impeller having an integrated structure can be easily formed by machining from a block-shaped base material, and the rotary tool is difficult to reach from the outside. Such processing costs can be kept low.
In the present embodiment, the through hole 10 formed in the cover 4 is filled with the plug body 11. Therefore, the plug body 11 is formed as a whole in an integral structure, and it is possible to prevent a decrease in the strength and hydrodynamic performance of the rotating machine during subsequent use of the rotating machine.

Further, the present embodiment has a simple configuration including a through hole 10 communicating with an internal space surrounded by the disk 3, the cover 4, and the blade 5, and a plug body 11 that fills the through hole 10. Therefore, it is possible to minimize the influence on the flow path 6 formed in the internal space and the ratio occupied by the joint surface of the plug body 11.
In the present embodiment, the cross section of the plug 11 that intersects the penetrating direction gradually becomes smaller in the direction (arrow B1 direction) in which the external force applied to the cover 4 (that is, centrifugal force and fluid supply pressure) acts. It is formed into a shape. Therefore, the plug body 11 is pushed into the through hole 10 by an external force applied as the rotating machine rotates.
As a result, the plug body 11 is prevented from falling off, and the entire structure of the rotating machine (that is, a one-piece closed impeller) is maintained, thereby preventing deterioration in the strength and hydrodynamic performance of the rotating machine. Is possible.

(Second Embodiment)
A second embodiment of the present invention will be described with reference to FIGS. 4 and 5. In the following description, the same reference numerals are given to portions that share the same configuration as the first embodiment, and redundant descriptions are omitted.
The impeller 20 that is the rotating machine 101 according to the second embodiment is different from the impeller 1 of the first embodiment in that the disk 3 is also provided with a through hole 21.

That is, as shown in detail in FIG. 5, a plurality of through holes 21 are also provided in the thickest portion of the disk 3.
These through-holes 21 communicate with the flow path 6 serving as an internal space surrounded by the disk 3, the cover 4, and the two blades 5 adjacent in the circumferential direction, like the through-hole 10 of the cover 4 described above, and the disk 3. A plurality of them are provided at regular intervals in the circumferential direction around the axis O.
When the impeller is manufactured, the rotary tool D such as an end mill can be inserted into the flow path 6 through each through-hole 21, and the rotary tool D is used in the region of the internal space that is difficult to reach from the outside by the rotary tool D. Machining can be performed. As a result, in this example, the integrated impeller 20 having a complicated three-dimensional shape can be easily formed by machining from a block-shaped base material.
Each through hole 21 has a cross section that gradually intersects the penetrating direction along a direction (arrow B2 direction) in which an external force (that is, centrifugal force and fluid supply pressure) applied to the disk 3, the cover 4, and the blade 5 acts. It is formed in a smaller shape. In addition, each through-hole 21 is filled and closed by a plug 22 after machining with the rotary tool D described above.

This plug body 22 corresponds to the shape of the through hole 21 along the direction (arrow B2 direction) in which an external force applied to the disk 3, the cover 4 and the blade 5 (that is, centrifugal force and fluid supply pressure) acts. The cross section that intersects the penetration direction is formed in a shape that gradually decreases.
With such a configuration, the plug body 22 is pushed into the through hole 21 by an external force applied as the impeller 20 rotates, and the impeller 20 is maintained in an integrated structure (that is, a one-piece closed impeller). it can.

The plug 22 is preferably elastically deformed or plastically deformed and is in close contact with the inner peripheral surface of the through hole 21, as with the plug 11.
In addition, the above-described plug body 22 has a female screw formed on the inner peripheral surface of the through-hole 21 and a male screw formed on the outer peripheral surface of the plug body 22 and is screwed into the through-hole 21 regardless of elastic deformation or plastic deformation. You may make it.

As described above in detail, according to the second embodiment, the through-hole 21 communicating with the internal space surrounded by the disk 3, the cover 4 and the blade 5 is provided in the disk 3. Therefore, the rotary tool D can be inserted into the internal space via the through hole 21 together with the previous through hole 10, and machining with the rotary tool D is difficult to reach from the outside by the rotary tool D. It can be carried out.
As a result, in the second embodiment, a rotary machine such as an impeller having an integrated structure can be easily formed by machining from a block-shaped base material, and the rotary tool D is difficult to reach from the outside. The same effects as in the first embodiment can be obtained, such as the processing cost related to the region can be kept low.

(Third embodiment)
A third embodiment of the present invention will be described with reference to FIGS. In the following description, the same reference numerals are given to portions that share the same configuration as the previous embodiment, and redundant descriptions are omitted.
The impeller 30 serving as the rotary machine 102 according to the third embodiment is different from the

impellers

1 and 20 of the previous embodiment in that the concave notch 31 is formed on the edge 5A of the blade 5 located at the inlet opening of the flow path 6. Is further formed.

As shown in FIG. 8A, the notches 31 are respectively formed on edge portions 5A of the blades 5 provided at a predetermined interval in the circumferential direction with the axis O of the disk 3 as the center. A rotary tool D such as an end mill can be inserted into the flow path 6 through each notch 31, and machining with the rotary tool D can be performed in the region of the internal space that is difficult to reach from the outside by the rotary tool D. .
As a result, in this example, the integrated impeller 30 having a complicated three-dimensional shape can be easily formed by machining from a block-shaped base material.

A hole filling member 32 for closing the notch 31 is fixed to the edge 5A of the blade 5 as shown in detail in FIGS. 8B and 9.
The hole filling member 32 is fixed to the edge 5 </ b> A of the blade 5 so as to cover the notch 31 after machining with the rotary tool D. The hole filling member 32 serves to supplement the shape of the impeller 30.

Further, as shown in FIG. 9, a tapered surface 33 is provided between the blade 5 and the hole-filling member 32 so that a contact force with the blade 5 is increased by a centrifugal force (indicated by an arrow M) applied to the blade 5. And 34 are formed.
The tapered surfaces 33 and 34 cause the hole-filling member 32 to be brought into close contact with the edge 5A of the blade 5 by an external force applied as the impeller 30 rotates, thereby contributing to the integral structure of the impeller 30. it can.

As described in detail above, according to the third embodiment, the notch 31 that communicates with the internal space surrounded by the disk 3, the cover 4, and the blade 5 is provided in the edge 5 </ b> A of the blade 5. Therefore, the rotary tool D can be inserted into the internal space through the notch 31 together with the previous through

holes

10 and 21, and the machine using the rotary tool D is difficult to reach from the outside by the rotary tool D. Processing can be performed.
As a result, in the third embodiment, a rotary machine such as an impeller having an integrated structure can be easily formed by machining from a block-shaped base material, and the rotary tool D is difficult to reach from the outside. The effect similar to 1st and 2nd embodiment can be acquired, such as being able to hold down the processing cost concerning a field low.

In the third embodiment, the concave notch 31 and the hole filling member 32 for closing the notch 31 are provided at the edge 5A of the blade 5 located at the inlet opening of the flow path 6. It is not limited to this. The notch 31 and the hole filling member 32 may be provided at the edge of the blade 5 located at the outlet opening of the flow path 6.

(Fourth embodiment)
A fourth embodiment of the present invention will be described with reference to FIGS. In the following description, the same reference numerals are given to portions that share the same configuration as the previous embodiment, and redundant descriptions are omitted.
The difference between the impeller 40 serving as the rotary machine 103 according to the fourth embodiment and the

impellers

1, 20, and 30 of the previous embodiment is a position where the through hole 41 is formed.

That is, as shown in FIGS. 10 and 11, the through hole 41 shown in the fourth embodiment includes a plurality of blades 5 provided at regular intervals in the circumferential direction around the axis O of the disk 3. It is provided through.
The through hole 41 is provided through the plurality of blades 5 linearly. When the impeller is manufactured, the through-hole 41 allows the rotary tool D such as an end mill to be inserted into the flow path 6 through the through-hole 41, and the rotation tool D rotates the rotation tool D in the region of the internal space that is difficult to reach from the outside. Machining with the tool D can be performed.
As a result, in this example, the integrated impeller 20 having a complicated three-dimensional shape can be easily formed by machining from a block-shaped base material.
Further, as shown in FIG. 12, each through-hole 41 has a direction in which an external force applied to the blade 5 (ie, centrifugal force, fluid supply pressure) acts (direction from the pressure surface Sp toward the negative pressure surface Ss, direction indicated by an arrow B3) ), The cross section intersecting with the penetrating direction is formed in a shape that gradually becomes smaller, and after machining with the rotary tool D described above, it is buried and closed by the plug 42.

This plug body 42 corresponds to the shape of the through hole 41 along the direction (arrow B3 direction) in which an external force applied to the disk 3, the cover 4 and the blade 5 (that is, centrifugal force and fluid supply pressure) acts. The cross section that intersects the penetration direction is formed in a shape that gradually decreases.
With such a configuration, the plug body 42 is pushed into the through-hole 41 by an external force accompanying the rotation of the impeller 20, and the integrated structure of the impeller 20 (that is, a one-piece closed impeller) can be maintained.

The plug body 42 is preferably elastically deformed or plastically deformed and is in close contact with the inner peripheral surface of the through hole 41, similarly to the plug body 11.
In addition, the above-described plug body 42 has a female screw formed on the inner peripheral surface of the through hole 41 and a male screw formed on the outer peripheral surface of the plug body 42 and is screwed into the through hole 41 regardless of elastic deformation or plastic deformation. It may be.

As described above in detail, according to the fourth embodiment, the through hole 41 that leads to the internal space surrounded by the disk 3, the cover 4, and the blade 5 is provided so as to penetrate the plurality of disks 3. Therefore, the rotary tool D can be inserted into the internal space via the through hole 41, and machining with the rotary tool D can be performed in an area that is difficult to reach from the outside by the rotary tool D.
As a result, in the fourth embodiment, a rotary machine such as an impeller having an integrated structure can be easily formed by machining from a block-shaped base material, and the rotary tool D is difficult to reach from the outside. The effect similar to the above-mentioned embodiment can be acquired, such as being able to hold down the processing cost concerning an area | region low.

The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to this embodiment, and design changes and the like within a scope not departing from the gist of the present invention are included.

The present invention relates to a rotating machine applied to an impeller of a centrifugal compressor such as a supercharger, a gas turbine, or an industrial compressor, and a method of manufacturing the rotating machine.

1 impeller
3 disk 4 cover 5 blade 5A edge 6 flow path 10 through hole 11 plug body 20 impeller 21 through hole 22 plug body 30 impeller 31 notch 32 hole filling member 33 taper surface 34 taper surface 40 impeller 41 through hole 42 plug body 100 rotation Machine 101 Rotating machine 102 Rotating machine 103 Rotating machine B1 Direction in which external force acts B2 Direction in which external force acts B3 Direction in which external force acts C Shaft body D Rotating tool O Axis line

Claims

A disc provided to be rotatable integrally with the shaft body;
A cover provided between the disc in an axial direction and a radial direction;
A plurality of blades provided between the disks and the cover for guiding the fluid between the disks and the cover outward;
A plug that passes through at least one of the disk, the cover, and the blade, and closes a through hole that communicates with the internal space surrounded by the disk, the cover, and the blade;
The plug body is a rotating machine having a shape in which a cross section intersecting with a penetrating direction through which the through-hole penetrates gradually decreases in a direction in which an external force acts on the disk, cover, and blade.
The rotary machine according to claim 1, wherein the through hole is formed in a shape that penetrates the disk and gradually decreases in cross section in the direction of centrifugal force applied to the disk.
The rotary machine according to claim 1, wherein the through hole is formed in a shape that penetrates the cover and gradually decreases in cross section in the direction of centrifugal force applied to the cover.
The rotating machine according to claim 1, wherein the through hole is formed in a shape that penetrates the blade and gradually decreases in cross section in a direction of centrifugal force applied to the blade.
A notch is formed at the edge of the blade located at the inlet or outlet of the flow path serving as the internal space,
The rotary machine according to any one of claims 1 to 4, wherein a hole filling member for closing the notch is fixed to an edge of the blade.
The rotary machine according to claim 5, wherein the hole filling member has a tapered surface so that a contact force with the blade is increased by a centrifugal force applied to the blade.
The rotary machine according to claim 1, wherein the through-hole passes through the plurality of blades arranged along a rotation direction of the shaft body.
A disc provided to be rotatable integrally with the shaft body;
A cover provided between the disc in an axial direction and a radial direction;
A rotating machine having a plurality of blades provided between the disks and the cover to guide the fluid between the disks and the cover outward,
Forming a base material having an outer shape including the disk and a cover;
A second step of forming a part of a flow path surrounded by the disk, the cover, and the blade by inserting a rotary tool from a region corresponding to a radial and axial distance between the disk and the cover; ,
A third hole is formed which communicates with a flow path surrounded by the disk, the cover, and the blade, and forms a through hole having a shape in which a cross section intersecting the penetration direction gradually decreases in a direction in which an external force acts on the disk, the cover, and the blade. Process,
A fourth step of inserting a rotary tool from the through-hole and forming another portion of the flow path surrounded by the disk, cover and blade and not processed by the second step;
And a fifth step of closing the plug body by inserting the plug body in a direction in which the external force acts on the through hole.
A method for manufacturing a rotary machine, wherein after forming a part of the flow path by the fourth step in the method of manufacturing a rotary machine according to claim 8, another part of the flow path is formed by the second process.