JP2019002290A - Impeller, rotating machine and manufacturing method of impeller - Google Patents

Abstract

To provide an impeller which can improve the rigidity of an impeller main body itself, a rotating machine and a manufacturing method of the impeller.SOLUTION: An impeller comprises: an impeller main body 31 having a boss hole penetrating a center part and a hub face, and constituted of a reinforcing fiber-containing resin 32; blades arranged at the hub face of the impeller main body 31 in a plurality of pieces in a peripheral direction Dc of the impeller main body 31; and a reinforcing core piece 35 which is internally arranged at a portion located at the boss hole side out of the impeller main body 31, and whose internal peripheral face 35b defines a part of the boss hole. The reinforcing core piece 35 has an external peripheral face 35a for guiding a flow of the reinforcing fiber-containing resin 32 located at a back face side of the impeller main body 31 to a radial direction of the reinforcing core piece 35.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an impeller, a rotating machine, and a method for manufacturing an impeller.

One of rotating machines equipped with an impeller is a turbocharger. A turbocharger is a rotating machine that can improve the fuel efficiency and CO ₂ reduction effect compared to a naturally aspirated engine by sending compressed air into the engine and burning the fuel (for example, Patent Documents). 1).

Patent Document 1 discloses an impeller having a reinforcing core piece that is provided in an impeller body made of carbon fiber reinforced plastic and exposed from a boss hole of the impeller, from the viewpoint of suppressing deformation of the rotating impeller. Yes.
Patent Document 1 discloses that the rigidity of the impeller body can be improved by providing a reinforcing core piece.

  Furthermore, in Patent Document 1, by using reinforced fiber plastic as the material of the reinforcing core piece, the difference in the linear expansion coefficient between the impeller body and the reinforcing core piece can be reduced, and the deformation of the entire impeller can be further suppressed. It is disclosed.

Japanese Patent Laid-Open No. 2006-108986

By the way, the rotating impeller body generates stress fields in various directions due to centrifugal force.
As in Patent Document 1, it is possible to suppress the separation at the interface between the impeller body and the reinforcing core piece to some extent by providing the impeller body made of carbon fiber reinforced plastic with the reinforcing core piece made of the reinforcing fiber plastic. It is. However, in the configuration of Patent Document 1, it is difficult to improve the strength of the impeller body itself.

  Then, an object of this invention is to provide the manufacturing method of the impeller which can improve the intensity | strength of impeller main body itself, a rotary machine, and an impeller.

  In order to solve the above problems, an impeller according to an aspect of the present invention has a truncated cone shape, and has a boss hole and a hub surface penetrating the center portion, and is configured of a reinforced fiber-containing resin. And a plurality of blades arranged on the hub surface of the impeller main body and arranged in the circumferential direction of the impeller main body, and in the rear surface side of the impeller main body, are located in a portion located on the boss hole side, A reinforcing core piece having an inner peripheral surface defining a part of the boss hole, and the reinforcing core piece guides the flow of the reinforcing fiber-containing resin located on the back side of the impeller body in the radial direction of the reinforcing core piece. An outer peripheral surface.

  According to the present invention, by having the reinforcing core piece having the outer peripheral surface that guides the flow of the reinforcing fiber-containing resin located on the back side of the impeller body in the radial direction of the reinforcing core piece, so as to follow the outer peripheral surface of the reinforcing core piece. It becomes possible to orient the reinforcing fibers contained in the reinforcing fiber-containing resin. That is, the orientation of the reinforcing fibers can be controlled by the inclination (shape) of the outer peripheral surface of the reinforcing core piece. Thereby, the intensity | strength of impeller main body itself can be improved.

  Moreover, the impeller which concerns on 1 aspect of the said invention WHEREIN: The said reinforcement core piece may have the some groove | channel in which the said reinforcement fiber containing resin is accommodated in the part which contacts the said impeller main body.

In this way, by providing a plurality of grooves in which the reinforcing fiber-containing resin is accommodated in the portion of the reinforcing core piece that comes into contact with the impeller body, it is possible to obtain an anchor effect by the reinforcing fiber-containing resin filling the plurality of grooves. Become.
As a result, it is possible to improve the adhesion at the interface between the impeller body and the reinforcing core piece, and therefore, even when the impeller rotates at a high speed, peeling at the interface between the impeller body and the reinforcing core piece can be sufficiently suppressed.

  Moreover, it becomes possible to orient the longitudinal direction of a reinforced fiber to the extension direction of a groove | channel by having a some groove | channel filled with resin containing a reinforced fiber. Thereby, the reinforcing fiber-containing resin filled in the plurality of grooves can function as reinforcing ribs for the impeller body.

  Further, in the impeller according to the aspect of the present invention, the plurality of grooves may be formed in a portion of the reinforcing core piece that is located on the front side of the impeller body and a portion that is located on the back side of the impeller body. It may be provided.

  Thus, by providing a plurality of grooves in the portion of the reinforcing core piece that is located on the front side of the impeller body and the portion that is located on the back side of the impeller body, further peeling at the interface between the impeller body and the reinforcing core piece is further performed. Can be suppressed.

  In the impeller according to one aspect of the present invention, the plurality of grooves may include ring-shaped grooves arranged in a circumferential direction of the impeller body.

  As described above, the plurality of grooves include the ring-shaped grooves arranged in the circumferential direction of the impeller body, thereby orienting the reinforcing fibers in the circumferential direction of the impeller body to form reinforcing ribs composed of the plurality of reinforcing fibers. It becomes possible to do. Thereby, the intensity | strength of the circumferential direction of an impeller main body can be improved.

  In the impeller according to the aspect of the present invention, the plurality of grooves may include radial grooves arranged radially in the radial direction of the impeller body.

  As described above, the plurality of grooves include the radial grooves arranged radially in the radial direction of the impeller body, so that the reinforcing fibers are radially oriented in the radial direction of the impeller body, and the reinforcing ribs are formed of the plurality of reinforcing fibers. Can be formed. Thereby, the intensity | strength of the radial direction of an impeller main body can be improved.

  Moreover, the impeller which concerns on 1 aspect of the said invention WHEREIN: The material of the said reinforcement core piece may be the same kind of reinforcement fiber containing resin as the said reinforcement fiber containing resin.

  Thus, by using the same type of reinforcing fiber-containing resin as the reinforcing fiber-containing resin as the material of the reinforcing core piece, it is possible to reduce the difference between the linear expansion coefficient of the reinforcing core piece and the linear expansion coefficient of the impeller body. Become. Thereby, the fall of the restraining force of the impeller main body resulting from the diameter expansion of the reinforcement core piece by thermal expansion can be suppressed.

Further, since the reinforcing core piece includes reinforcing fibers, the rigidity of the reinforcing core piece can be increased. Therefore, it is possible to suppress a reduction in the restraining force of the impeller body due to the diameter expansion due to the centrifugal force of the reinforcing core piece itself.
Therefore, the centrifugal force acting on the impeller body can be distributed to the reinforcing core piece, and the impeller body stress caused by the centrifugal force can be reduced. Thereby, the deformation | transformation of the whole impeller can be suppressed.

  Moreover, the impeller which concerns on 1 aspect of the said invention WHEREIN: The foaming material may be sufficient as the material of the said reinforcement core piece.

As described above, by using the foam material as the material of the reinforcing core piece, the reinforcing fiber-containing resin enters the plurality of recesses formed on the surface of the foam material, so that an anchor effect can be obtained.
Thereby, since it becomes possible to further improve the adhesiveness in the interface of an impeller main body and a reinforcement core piece, peeling in the interface of an impeller main body and a reinforcement core piece can further be suppressed.

  In the impeller according to one aspect of the present invention, the foam material may be foam aluminum.

Thus, by using foamed aluminum as the foamed material, the anchor effect at the interface between the impeller body and the reinforcing core piece can be enhanced.
In addition, by using foamed aluminum composed of aluminum with good thermal conductivity, when forming the impeller body using the reinforcing fiber-containing resin, the reinforcing fiber-containing resin at the center of the impeller body where the reinforcing core piece is arranged It is possible to facilitate cooling.
This makes it possible to prevent molding defects such as cracks and deformation due to shrinkage due to cooling delay of the reinforcing fiber-containing resin inside the impeller body, and improve the molding quality of the impeller body and suppress the yield reduction due to defects. be able to.

  In order to solve the above problems, an impeller according to an aspect of the present invention has a truncated cone shape, and has a boss hole and a hub surface penetrating the center portion, and is configured of a reinforced fiber-containing resin. And a plurality of blades arranged on the hub surface of the impeller body, arranged in the circumferential direction of the impeller body, and installed in a portion of the impeller body located on the boss hole side, A reinforcing core piece that defines a part of the boss hole, and the reinforcing core piece is an outer peripheral surface that guides the flow of the reinforcing fiber-containing resin located on the back side of the impeller body in the radial direction of the reinforcing core piece. The material of the reinforcing core piece may be a foam material.

  According to the present invention, by having the reinforcing core piece having the outer peripheral surface that guides the flow of the reinforcing fiber-containing resin located on the back side of the impeller body in the radial direction of the reinforcing core piece, so as to follow the outer peripheral surface of the reinforcing core piece. It becomes possible to orient the reinforcing fibers contained in the reinforcing fiber-containing resin. That is, the orientation of the reinforcing fibers can be controlled by the inclination (shape) of the outer peripheral surface of the reinforcing core piece. Thereby, the intensity | strength of impeller main body itself can be improved.

In addition, by using a foam material as the material of the reinforcing core piece, the reinforcing fiber-containing resin enters into a plurality of recesses formed on the surface of the foam material, so that an anchor effect can be obtained.
Thereby, since it becomes possible to improve the adhesiveness in the interface of an impeller main body and a reinforcement core piece, peeling in the interface of an impeller main body and a reinforcement core piece can fully be suppressed.

  In the impeller according to one aspect of the present invention, the foam material may be foam aluminum.

Thus, by using foamed aluminum as the foamed material, an anchor effect can be obtained at the interface between the impeller body and the reinforcing core piece.
In addition, by using foamed aluminum composed of aluminum with good thermal conductivity, when forming the impeller body using the reinforcing fiber-containing resin, the reinforcing fiber-containing resin at the center of the impeller body where the reinforcing core piece is arranged It is possible to facilitate cooling. Thereby, the fall of the yield of the impeller main body by the crack and shrinkage | contraction resulting from the cooling delay of reinforcement fiber containing resin can be suppressed.
Further, since the aluminum foam is lightweight, the weight of the impeller can be reduced.

In the impeller according to the aspect of the present invention, the reinforcing core piece is provided on the front side of the impeller body, and is provided on the first ring portion including the inner peripheral surface and on the back side of the impeller body. A second ring portion including a through-portion having a diameter larger than that of the boss hole,
The reinforcing fiber-containing resin may be arranged in a ring shape on the surface of the second ring portion that defines the penetrating portion.

  Thus, while the 2nd ring part which comprises a reinforcing core piece contains the penetration part expanded diameter rather than the boss hole, the surface of the 2nd ring part which divides a penetration part is formed in the ring-shaped reinforcement fiber containing resin Since the inner side and the outer side of the second ring portion are sandwiched between the reinforcing fiber-containing resins, the separation between the reinforcing core piece and the impeller body can be further suppressed.

  Moreover, the impeller which concerns on 1 aspect of the said invention WHEREIN: The said reinforcement core piece may have the some groove | channel in which the said reinforcement fiber containing resin is accommodated in the part which contacts the said impeller main body.

In this way, by providing a plurality of grooves in which the reinforcing fiber-containing resin is accommodated in the portion of the reinforcing core piece that comes into contact with the impeller body, it is possible to obtain an anchor effect by the reinforcing fiber-containing resin filling the plurality of grooves. Become.
As a result, it is possible to improve the adhesion at the interface between the impeller body and the reinforcing core piece, and therefore, even when the impeller rotates at a high speed, peeling at the interface between the impeller body and the reinforcing core piece can be sufficiently suppressed.

  Moreover, it becomes possible to orient the longitudinal direction of a reinforced fiber to the extension direction of a groove | channel by having a some groove | channel filled with resin containing a reinforced fiber. Thereby, the reinforcing fiber-containing resin filled in the plurality of grooves can function as reinforcing ribs for the impeller body.

  In the impeller according to an aspect of the present invention, the plurality of grooves may include ring-shaped grooves arranged in a circumferential direction of the impeller body.

  In this way, by including a ring-shaped groove arranged in the circumferential direction of the impeller body, the plurality of grooves aligns the reinforcing fibers in the circumferential direction of the impeller body, and includes a reinforcing fiber including the plurality of oriented reinforcing fibers. The resin can function as a reinforcing rib. Thereby, the intensity | strength of the circumferential direction of an impeller main body can be improved.

  In the impeller according to the aspect of the present invention, the plurality of grooves may include radial grooves arranged radially in the radial direction of the impeller body.

  In this way, the plurality of grooves include radial grooves arranged radially in the radial direction of the impeller body, thereby aligning the reinforcing fibers radially in the radial direction of the impeller body and reinforcing including the plurality of oriented reinforcing fibers. The fiber-containing resin can function as a reinforcing rib. Thereby, the intensity | strength of the radial direction of an impeller main body can be improved.

  In order to solve the above-described problem, a rotating machine according to an aspect of the present invention may include the impeller and a rotating shaft that is inserted into the boss hole of the impeller and rotates the impeller.

  According to the present invention, since the reduction of the restraining force of the impeller body can be suppressed by having the reinforcing core piece, the centrifugal force acting on the impeller body is distributed to the reinforcing core piece, and the stress generated in the impeller body due to the centrifugal force Can be reduced, and peeling at the interface between the impeller body and the reinforcing core piece can be sufficiently suppressed.

  In order to solve the above-described problem, an impeller manufacturing method according to an aspect of the present invention includes a step of inserting a pin of a mold into a pin insertion portion of a ring member that is a base material of a reinforcing core piece, and melting in the mold Introducing the reinforcing fiber-containing resin, and by guiding the flow of the reinforcing fiber-containing resin in the radial direction of the ring member by the outer peripheral surface of the ring member, and curing the molten reinforcing fiber-containing resin, Forming a base material of an impeller body in an impeller body forming region in the mold and forming a plurality of blades integrated with the impeller body; a base material of the impeller body from the mold; the impeller A step of taking out the ring member incorporated in the base material of the main body and a structure in which a plurality of blades are integrated; and removing the excess reinforcing fiber-containing resin from the structure; And a step of forming a boss hole penetrating said ring member in a portion corresponding to the serial pin insertion portion.

According to the present invention, the ring member serving as the base material of the reinforcing core piece has the pin insertion portion into which the pin of the mold is inserted, so that the position and posture of the ring member in the mold can be maintained.
In addition, by using a ring member having an outer peripheral surface that guides the flow of the reinforcing fiber-containing resin in the radial direction of the ring member, the reinforcing fibers included in the reinforcing fiber-containing resin are oriented along the outer peripheral surface of the ring member. It becomes possible to make it. That is, the orientation of the reinforcing fibers can be controlled by the inclination (shape) of the outer peripheral surface of the ring member. Thereby, the intensity | strength of impeller main body itself can be improved.

  Further, in the impeller manufacturing method according to the aspect of the present invention, before the ring member is accommodated in the mold, the reinforcing fiber is provided in a portion of the ring member that comes into contact with the reinforcing fiber-containing resin. You may include the groove | channel formation process which forms the some groove | channel in which containing resin is accommodated.

Thus, before accommodating the ring member in the mold, by forming a plurality of grooves in which the reinforcing fiber-containing resin is accommodated in a portion of the ring member that comes into contact with the reinforcing fiber-containing resin, a plurality of grooves are formed. An anchor effect can be obtained by the reinforcing fiber-containing resin filling the groove.
As a result, it is possible to improve the adhesion at the interface between the impeller body and the reinforcing core piece, and therefore, even when the impeller rotates at a high speed, peeling at the interface between the impeller body and the reinforcing core piece can be sufficiently suppressed.

  Moreover, it becomes possible to orient the longitudinal direction of a reinforced fiber in the extending direction of a groove | channel by having a groove | channel formation process. Thereby, the reinforcing fiber-containing resin filled in the plurality of grooves can function as reinforcing ribs for the impeller body.

  In the impeller manufacturing method according to one aspect of the present invention, in the groove forming step, a part of the ring member that is located on the front side of the impeller body and a part that is located on the back side of the impeller body. The plurality of grooves may be formed.

  Thus, by forming a plurality of grooves in the ring member in the portion located on the front side of the impeller body and in the portion located on the back side of the impeller body, peeling at the interface between the impeller body and the reinforcing core piece is performed. Further suppression can be achieved.

  Further, in the impeller manufacturing method according to one aspect of the present invention, in the groove forming step, the ring-shaped grooves disposed in the circumferential direction of the impeller body and the radial grooves in the radial direction of the impeller body are disposed. A radiation groove may be formed.

Thus, the circumferential direction of the impeller body includes a ring-shaped groove in which the plurality of grooves are arranged in the circumferential direction of the impeller body, and a radial groove in which the plurality of grooves are arranged radially in the radial direction of the impeller body. And, it becomes possible to orient the reinforcing fibers in the radial direction of the impeller body.
As a result, the reinforcing fiber-containing resin containing reinforcing fibers oriented in the ring-shaped grooves and the reinforcing fiber-containing resin containing reinforcing fibers oriented in the radial grooves can be made to function as reinforcing ribs. Thereby, the intensity | strength of the circumferential direction and radial direction of an impeller main body can be improved.

  In order to solve the above-described problems, an impeller manufacturing method according to an aspect of the present invention includes a step of forming a reinforcing core piece having a through hole penetrating a central portion, and a die pin is inserted into the through hole of the reinforcing core piece Introducing the reinforcing fiber-containing resin into the mold, and guiding the flow of the reinforcing fiber-containing resin in the radial direction of the reinforcing core piece by the outer peripheral surface of the reinforcing core piece, and the reinforcing fiber-containing resin. Forming the base material of the impeller body in the impeller body forming region in the mold, and forming a plurality of blades integrated with the impeller body, and from the mold to the impeller body A step of taking out the base material, the reinforcing core piece provided in the base material of the impeller main body, and the plurality of blades, and removing the structure from the structure. Removing the reinforcing fiber-containing resin and forming a boss hole having a diameter larger than that of the through hole in a portion corresponding to the through hole, and forming the reinforcing core piece in the foaming material. To form the reinforcing core piece.

  According to the present invention, by using a reinforcing core piece having an outer peripheral surface that guides the flow of the reinforcing fiber-containing resin in the radial direction of the reinforcing core piece, the reinforcing fiber-containing resin is included along the outer peripheral surface of the reinforcing core piece. It becomes possible to orient the reinforcing fibers. That is, the orientation of the reinforcing fibers can be controlled by the inclination (shape) of the outer peripheral surface of the reinforcing core piece. Thereby, the intensity | strength of impeller main body itself can be improved.

In addition, by forming a reinforcing core piece using a foam material, when the reinforcing fiber-containing resin is introduced into the mold, a plurality of recesses formed on the surface of the reinforcing core piece are embedded with the fiber reinforced resin. An anchor effect can be obtained.
Thereby, since it becomes possible to improve the adhesiveness in the interface of the fiber reinforced resin used as the base material of an impeller main body, and a reinforcement core piece, peeling in the interface of an impeller main body and a reinforcement core piece can fully be suppressed.

  In the impeller manufacturing method according to one aspect of the present invention, in the step of forming the reinforcing core piece, foamed aluminum may be used as the foamed material.

Thus, by using foamed aluminum as the foamed material, an anchor effect can be obtained at the interface between the impeller body and the reinforcing core piece.
In addition, by using foamed aluminum composed of aluminum with good thermal conductivity, when forming the impeller body using the reinforcing fiber-containing resin, the reinforcing fiber-containing resin at the center of the impeller body where the reinforcing core piece is arranged It is possible to facilitate cooling. Thereby, the fall of the yield of the impeller main body by the crack and shrinkage | contraction resulting from the cooling delay of reinforcement fiber containing resin can be suppressed.

  In the impeller manufacturing method according to one aspect of the present invention, in the step of forming the reinforcing core piece, a first ring portion including an inner peripheral surface that defines the through hole, and a diameter larger than that of the through hole. The reinforcing core piece may be formed so as to include a penetrating through portion and a second ring portion including the penetrating portion.

  In this way, the reinforcing core piece includes a through portion whose diameter is larger than that of the through hole, so that the surface of the second ring portion (part of the reinforcing core piece) defining the through portion is reinforced in a ring shape. A fiber-containing resin can be formed. Thereby, since the inner side and the outer side of the second ring portion are sandwiched between the reinforcing fiber-containing resins, peeling between the reinforcing core piece and the impeller body can be further suppressed.

  In the impeller manufacturing method according to one aspect of the present invention, in the step of forming the reinforcing core piece, a plurality of grooves may be formed in a portion of the reinforcing core piece that contacts the reinforcing fiber-containing resin. .

  In this way, by forming a plurality of grooves in the portion of the reinforcing core piece that comes into contact with the reinforcing fiber-containing resin, it becomes possible to fill the plurality of grooves with the reinforcing fiber-containing resin, and the extending direction of the grooves It becomes possible to orient the longitudinal direction of the reinforcing fiber. Thereby, the reinforcing fiber-containing resin filled in the plurality of grooves can function as reinforcing ribs for the impeller body.

  According to the present invention, the strength of the impeller body itself can be improved by controlling the fiber orientation of the impeller body by the reinforcing core piece.

It is sectional drawing which shows the rotary machine which concerns on the 1st Embodiment of this invention. It is sectional drawing to which the impeller for compressors shown in FIG. 1 was expanded. It is sectional drawing to which the reinforcement core piece shown in FIG. 2 was expanded. It is the figure which looked at the reinforcement core piece shown in FIG. It is the figure which looked at the reinforcement core piece shown in FIG. It is sectional drawing to which the part enclosed by the area | region E among the rotary machines shown in FIG. 1 was expanded. It is sectional drawing (the 1) for demonstrating the manufacturing method of the impeller which concerns on 1st Embodiment. It is sectional drawing (the 2) for demonstrating the manufacturing method of the impeller which concerns on 1st Embodiment. It is a flowchart for demonstrating the manufacturing method of the impeller which concerns on 1st Embodiment. It is sectional drawing of the impeller which concerns on the 2nd Embodiment of this invention. It is sectional drawing to which the part enclosed by the area | region F among the structures shown in FIG. 10 was expanded. It is sectional drawing (the 1) for demonstrating the manufacturing method of the impeller which concerns on 2nd Embodiment. It is sectional drawing (the 2) for demonstrating the manufacturing method of the impeller which concerns on 2nd Embodiment. It is a flowchart for demonstrating the manufacturing method of the impeller which concerns on 2nd Embodiment.

  Embodiments to which the present invention is applied will be described below in detail with reference to the drawings. The drawings used in the following description are for explaining the configuration of the embodiment of the present invention, and the size, thickness, dimensions, etc. of each part shown in the drawings are the same as the actual impeller and the dimensional relationship of the rotary machine. May be different.

(First embodiment)
FIG. 1 is a cross-sectional view showing a rotating machine according to a first embodiment of the present invention. In FIG. 1, as an example of the rotating machine 1, a turbocharger is illustrated as an example. In FIG. 1, O represents an axis of the impeller body 31 (hereinafter referred to as “axis”), AR represents air (hereinafter referred to as “air AR”), and G represents exhaust gas (hereinafter referred to as “exhaust gas G”). .

With reference to FIG. 1, the rotary machine 1 of 1st Embodiment is demonstrated.
The rotating machine 1 includes a rotating shaft 2, a turbine 3 and a compressor 4 that rotate together with the rotating shaft 2, and a housing connecting portion 5 that connects the turbine 3 and the compressor 4 and supports the rotating shaft 2.
In the rotating machine 1, the turbine 3 is rotated by exhaust gas G from an engine (not shown), and the air AR compressed by the compressor 4 along with this rotation is supplied to the engine.

  The rotating shaft 2 extends in the direction of the axis O. The rotating shaft 2 rotates around the axis O around the axis O.

The turbine 3 is provided on one side in the direction of the axis O (on the right side as viewed in FIG. 1). A rotating shaft 2 is attached to the turbine 3.
The turbine 3 includes a turbine impeller 14 having turbine blades 15 and a turbine housing 11 that covers the turbine impeller 14 from the outer peripheral side.

  The turbine impeller 14 is fitted with a rotating shaft 2 and is configured to be rotatable around the axis O together with the rotating shaft 2.

The turbine housing 11 accommodates a turbine impeller 14. Inside the turbine housing 11, a scroll passage 12 extending from the front edge portion (end portion on the radially outer side) of the turbine blade 15 toward the radially outer side is formed. The scroll passage 12 is an annular passage centered on the axis O at a radially outer position.
The scroll passage 12 communicates with the inside and outside of the turbine housing 11. The exhaust gas G is introduced into the turbine impeller 14 from the scroll passage 12, whereby the turbine impeller 14 and the rotating shaft 2 rotate.

  The turbine housing 11 is provided with a discharge port 13 that opens on one side of the axis O. The exhaust gas G that has passed through the turbine blade 15 circulates toward one side of the axis O, and is discharged from the discharge port 13 to the outside of the turbine housing 11.

  The compressor 4 is disposed on the other side in the direction of the axis O (left side as viewed in FIG. 1). A rotary shaft 2 is attached to the compressor 4. The compressor 4 includes an impeller 25 and a compressor housing 21 that covers the impeller 25 from the outer peripheral side.

  FIG. 2 is an enlarged cross-sectional view of the compressor impeller shown in FIG. In FIG. 2, Da is the direction of the axis O (hereinafter referred to as “axial direction Da”), Dr is the radial direction of the impeller body 31 (hereinafter referred to as “radial direction Dr”), and Dc is the circumferential direction of the impeller body 31 (hereinafter referred to as “axial direction Dr”). , “Circumferential direction Dc”). In FIG. 2, the same components as those in the structure shown in FIG.

  Referring to FIGS. 1 and 2, the impeller 25 includes an impeller body 31, a plurality of blades 33, and a reinforcing core piece 35.

  The impeller body 31 is a member having a truncated cone shape, and includes a front surface 31a, a back surface 31b, a hub surface 31c, and a boss hole 31A.

The front surface 31a is a surface disposed on the inlet side of the compressor 4 into which the air AR flows. The front surface 31a is a surface parallel to a virtual plane orthogonal to the axis O. The center position of the front surface 31a coincides with a point on the axis O.
The front surface 31a exposes one end of the boss hole 31A. The shape of the front surface 31a is a circular ring shape.

The back surface 31b is a surface disposed on the outlet side of the compressor 4 from which the air AR flows out. The back surface 31b is a surface parallel to a virtual plane orthogonal to the axis O. The back surface 31b is a surface disposed on the opposite side of the front surface 31a. The center position of the back surface 31b coincides with one point on the axis O.
The back surface 31b exposes the other end of the boss hole 31A. The shape of the back surface 31b is a circular ring shape. The back surface 31b is configured such that the width of the impeller body 31 in the radial direction Dr is wider than that of the front surface 31a.

  The hub surface 31c is an outer peripheral surface of the impeller body 31, and is provided so as to extend from the front surface 31a to the back surface 31b. The hub surface 31c is a curved surface that is recessed in the direction toward the axis O.

  The boss hole 31 </ b> A is a hole that penetrates the central portion of the impeller body 31. The rotating shaft 2 is inserted into the boss hole 31A. In this state, the impeller body 31 is fixed to the end of the rotating shaft 2.

The impeller body 31 having the above-described configuration can be formed using, for example, injection molding using a mold. As the material of the impeller body 31, a reinforced fiber-containing resin 32, which is a resin including reinforced fibers, is used.
As the reinforcing fiber-containing resin 32, for example, a carbon fiber-containing resin containing carbon fibers can be used. In addition, as the reinforcing fiber, fibers other than carbon fibers can be used. For example, glass fibers, whiskers or the like may be used.

  The plurality of blades 33 are formed integrally with the hub surface 31 c of the impeller body 31. The plurality of blades 33 are arranged in the circumferential direction of the impeller body 31 in a state of being erected on the hub surface 31c and spaced apart from each other. Between the blades provided at positions adjacent to each other, a flow path (not shown) for circulating the air AR is defined.

When the plurality of blades 33 are configured integrally with the hub surface 31 c of the impeller body 31, the reinforcing fiber-containing resin 32 that is the material of the impeller body 31 can be used as the material of the plurality of blades 33.
The impeller body 31 and the plurality of blades 33 may be separated. In this case, as the material of the plurality of blades 33, resin, metal, or the like can be used. In this case, examples of the resin used as the material of the plurality of blades 33 include polyethersulfone (PES), polyetherimide (PEI), polyetheretherketone (PEEK), polyetherketone (PEK), and polyetherketoneketone. (PEKK), polyketone sulfide (PKS), polyallyl ether ketone (PAEK), aromatic polyamide (PA), polyamideimide (PAI), polyimide (PI) and the like can be exemplified.

FIG. 3 is an enlarged cross-sectional view of the reinforcing core piece shown in FIG. In FIG. 3, the same components as those in the structure shown in FIG.
4 is a view of the reinforcing core piece shown in FIG. FIG. 5 is a view of the reinforcing core piece shown in FIG. 6 is an enlarged cross-sectional view of a portion surrounded by a region E in the rotary machine shown in FIG. 3 to 6, the same components are denoted by the same reference numerals.

Next, the reinforcing core piece 35 will be described with reference to FIGS.
The reinforcing core piece 35 is a member for improving the strength of the impeller body 31. The reinforcing core piece 35 is provided in a portion of the impeller body 31 located on the boss hole 31A side.
The reinforcing core piece 35 includes a boss hole 37, an outer peripheral surface 35a, an inner peripheral surface 35b, a first groove group 38 that is a plurality of grooves, and a second groove group 39 that is a plurality of grooves.

  The boss hole 37 is a hole that penetrates the central portion of the reinforcing core piece 35 in the axial direction Da. The center line of the boss hole 37 coincides with the axis O. The boss hole 37 constitutes a part of the boss hole 31A.

The outer peripheral surface 35a is a surface covered with the impeller body 31, and has a front surface 35aA and a back surface 35aB. The front surface 35aA is a ring-shaped surface disposed on the front surface 31aA side of the impeller body 31.
The front surface 35aA is a surface that is inclined in a direction away from the axis O as it goes from the front surface 31a side to the back surface 31b side of the impeller body 31.

The back surface 35 a B is a ring-shaped surface disposed on the back surface 31 b side of the impeller body 31. The back surface 35aB is a surface inclined in a direction approaching the axis O as it goes from the front surface 31a side to the back surface 31b side of the impeller body 31.
The front surface 35aA and the back surface 35aB are integrally formed. The shape of the surface near the boundary between the front surface 35aA and the back surface 35aB is a rounded shape.

The outer peripheral surface 35 a configured as described above guides the flow of the reinforcing fiber-containing resin 32 located on the back side of the impeller body 31 in the radial direction of the reinforcing core piece 35.
By having such an outer peripheral surface 35a, the reinforcing fibers 32B included in the reinforcing fiber-containing resin 32 can be oriented along the outer peripheral surface 35a of the reinforcing core piece 35. That is, the orientation of the reinforcing fibers 32B can be controlled by the inclination (shape) of the outer peripheral surface 35a of the reinforcing core piece 35. Thereby, the intensity | strength of impeller main body 31 itself can be improved.

  The inner peripheral surface 35 b is a surface that partitions the boss hole 37. When the rotating shaft 2 is inserted into the boss hole 37, the inner peripheral surface 35 b comes into contact with the outer peripheral surface of the rotating shaft 2.

The first groove group 38 is provided on the front surface 35 a A side of the reinforcing core piece 35. The first groove group 38 has a plurality of ring-shaped grooves 41 and radiation grooves 42.
The plurality of ring-shaped grooves 41 are provided concentrically around the axis O. The plurality of ring-shaped grooves 41 are embedded with a resin 32A and a reinforcing fiber 32B constituting the reinforcing fiber-containing resin 32 (see FIG. 6).

An anchor effect can be obtained by providing a plurality of ring-shaped grooves 41 having such a configuration and embedding the plurality of ring-shaped grooves 41 with a reinforcing fiber-containing resin 32 (material of the impeller body 31). .
This makes it possible to improve the adhesion at the interface between the impeller body 31 and the reinforcing core piece 35, so that even when the impeller 25 rotates at a high speed, peeling at the interface between the impeller body 31 and the reinforcing core piece 35 is sufficiently suppressed. can do.
In addition, by having the plurality of ring-shaped grooves 41, it is possible to orient the reinforcing fibers 32B in the circumferential direction of the impeller body 31 and to form reinforcing ribs composed of the plurality of reinforcing fibers 32B. Thereby, the intensity | strength of the circumferential direction of the impeller main body 31 can be improved.

  The width of the ring-shaped groove 41 can be set as appropriate within a range of 0.2 mm to 5.0 mm, for example. Further, the depth of the ring-shaped groove 41 can be appropriately set within a range of 0.2 mm or more and 5.0 mm or less, for example.

The radial grooves 42 are formed radially in the radial direction Dr of the impeller body 31 with the axis O as the center. The radiation groove 42 intersects the plurality of ring-shaped grooves 41. Although not shown, like the ring-shaped groove 41 described above, the radiation groove 42 is embedded with a resin 32A and a reinforcing fiber 32B constituting the reinforcing fiber-containing resin 32.
The width and depth of the radiation groove 42 can be set to the same width and depth as the ring-shaped groove 41, for example.

An anchor effect can be obtained by providing the radiation groove 42 having such a configuration and embedding the radiation groove 42 with the reinforcing fiber-containing resin 32 (material of the impeller body 31). This makes it possible to improve the adhesion at the interface between the impeller body 31 and the reinforcing core piece 35, so that even when the impeller 25 rotates at a high speed, peeling at the interface between the impeller body 31 and the reinforcing core piece 35 is sufficiently suppressed. can do.
Further, by having the radiation grooves 42, it is possible to orient the reinforcing fibers 32B radially in the radial direction of the impeller body 31, and to form reinforcing ribs composed of a plurality of reinforcing fibers 32B. Thereby, the intensity | strength of the radial direction of the impeller main body 31 can be improved.

  The second groove group 39 is configured in the same manner as the first groove group 38 described above, except that the second groove group 39 is provided on the back surface 35aB side of the reinforcing core piece 35. That is, the second groove group 39 includes the plurality of ring-shaped grooves 41 and the radiation grooves 42 described above.

  As described above, the reinforcing core piece 35 has a plurality of grooves (first portions) on the front surface 35aA side (the portion located on the front surface 31a side of the impeller body 31) and the back surface 35aB side (the portion located on the back surface 31b side of the impeller body 31). By providing the first and second groove groups 38 and 39), peeling at the interface between the impeller body 31 and the reinforcing core piece 35 can be further suppressed.

  As a material of the reinforcing core piece 35, for example, it is preferable to use the same type of reinforcing fiber-containing resin as the reinforcing fiber-containing resin 32 constituting the impeller body 31.

Thus, by using the same type of reinforcing fiber-containing resin as the reinforcing fiber-containing resin 32 as the material of the reinforcing core piece 35, the difference between the linear expansion coefficient of the reinforcing core piece 35 and the linear expansion coefficient of the impeller body 31 is reduced. It becomes possible.
Thereby, the fall of the restraining force of the impeller main body 31 resulting from the diameter expansion of the reinforcement core piece 35 by thermal expansion can be suppressed.

In addition, since the reinforcing core piece 35 includes the reinforcing fibers 32B, the rigidity of the reinforcing core piece 35 can be increased. Therefore, the restraining force of the impeller body 31 is reduced due to the diameter expansion due to the centrifugal force of the reinforcing core piece 35 itself. Can be suppressed.
Therefore, the centrifugal force acting on the impeller body 31 can be distributed to the reinforcing core piece 35, and the stress on the impeller body 31 caused by the centrifugal force can be reduced. Thereby, the deformation | transformation of the impeller 25 whole can be suppressed.

  In addition, as a material of the reinforcing core piece 35, for example, a foam material (for example, a foam metal, a foam resin, a fiber reinforced foam resin, or the like) may be used.

Thus, by using the foam material as the material of the reinforcing core piece 35, the reinforcing fiber-containing resin 32 enters the plurality of recesses formed on the surface of the foam material, so that an anchor effect can be obtained.
As a result, it is possible to further improve the adhesion at the interface between the impeller body 31 and the reinforcing core piece 35, so that peeling at the interface between the impeller body 31 and the reinforcing core piece 35 can be further suppressed.

  Moreover, as a foaming material, you may use the foaming aluminum which is a foam metal, for example.

  Thus, by using foamed aluminum as the foamed material, the anchor effect at the interface between the impeller body 31 and the reinforcing core piece 35 can be enhanced.

Moreover, when forming the impeller body 31 using the reinforcing fiber-containing resin 32 by using foamed aluminum composed of aluminum having good thermal conductivity, the central portion of the impeller body 31 in which the reinforcing core piece 35 is disposed is reinforced. It becomes possible to make it easy to cool the fiber-containing resin 32.
Thereby, it becomes possible to prevent molding defects such as cracks due to cooling delay of the reinforcing fiber-containing resin 32 inside the impeller body 31 and deformation due to shrinkage, and improve the molding quality of the impeller body 31 and decrease the yield due to defects. Can be suppressed.

Next, the compressor housing 21 will be described with reference to FIG.
The compressor housing 21 accommodates the impeller 25. The compressor housing 21 has a suction port 23 that opens on the other side of the axis O.
Air AR is introduced into the impeller 25 from the outside of the compressor housing 21 through the suction port 23. Then, the rotational force from the turbine impeller 14 is transmitted to the impeller 25 via the rotary shaft 2, so that the impeller 25 rotates around the axis O and the air AR is compressed.

The compressor housing 21 extends radially outward from the rear edge of the blade 33 (downstream end of the flow of the air AR), and has an annular shape centered on the axis O at a radially outer position. A compressor passage 22 communicating with the inside and outside of the compressor housing 21 is formed.
The air AR compressed by the impeller 25 is introduced into the compressor passage 22 and discharged to the outside of the compressor housing 21.

The housing connecting portion 5 is disposed between the compressor housing 21 and the turbine housing 11. The housing connecting portion 5 connects the compressor housing 21 and the turbine housing 11.
The housing connecting part 5 accommodates the rotating shaft 2. A bearing 6 is provided inside the housing connecting portion 5. The bearing 6 supports the rotary shaft 2 so as to be rotatable relative to the housing connecting portion 5.

  According to the impeller 25 of the first embodiment, the impeller 25 includes the reinforcing core piece 35 including the outer peripheral surface 35 a that guides the flow of the reinforcing fiber-containing resin 32 positioned on the back side of the impeller body 31 in the radial direction of the reinforcing core piece 35. Thus, the reinforcing fibers 32B included in the reinforcing fiber-containing resin 32 can be oriented along the outer peripheral surface 35a of the reinforcing core piece 35. That is, the orientation of the reinforcing fibers 32B can be controlled by the inclination (shape) of the outer peripheral surface 35a of the reinforcing core piece 35. Thereby, the intensity | strength of impeller main body 31 itself can be improved.

In addition, among the reinforcing core piece 35 that improves the strength of the impeller body 31, first and second groove groups 38 in which the reinforcing fiber-containing resin 32 (material of the impeller body 31) is accommodated in a portion in contact with the impeller body 31. By having 39, the anchor effect can be obtained by the reinforcing fiber-containing resin 32 filling the first and second groove groups 38, 39.
This makes it possible to improve the adhesion at the interface between the impeller body 31 and the reinforcing core piece 35, so that even when the impeller 25 rotates at a high speed, peeling at the interface between the impeller body 31 and the reinforcing core piece 35 is sufficiently suppressed. can do.

  Further, the first and second groove groups 38 and 39 are filled with the reinforcing fiber-containing resin, so that the longitudinal direction of the reinforcing fibers 32B can be oriented in the extending direction of the grooves. Thereby, the reinforcing fiber-containing resin 32 filling the first and second groove groups 38 and 39 can function as a reinforcing rib.

Moreover, according to the rotary machine 1 of 1st Embodiment provided with the said impeller 25, the intensity | strength of impeller main body 31 itself can be improved.
In addition, by having the reinforcing core piece 35, it is possible to suppress a reduction in the restraining force of the impeller body 31.
Thereby, the centrifugal force acting on the impeller body 31 can be distributed to the reinforcing core piece 35 to reduce the stress generated in the impeller body 31 due to the centrifugal force, and the separation at the interface between the impeller body 31 and the reinforcing core piece 35 can be sufficiently suppressed. can do.

  In the first embodiment, the case where both the ring-shaped groove 41 and the radiating groove 42 are formed in the reinforcing core piece 35 has been described as an example, but either the ring-shaped groove 41 or the radiated groove 42 is selected. Only one groove may be formed in the reinforcing core piece 35.

  In 1st Embodiment, although the case where the groove | channel was provided in both the front surface 35aA and the back surface 35aB of the reinforcement core piece 35 was demonstrated as an example, a groove | channel was formed only in either one surface among the front surface 35aA and the back surface 35aB. It may be provided.

  Furthermore, in the first embodiment, the ring-shaped groove 41 and the radiation groove 42 have been described as examples of the groove, but the shape of the groove is not limited thereto. The shape of the groove can be appropriately selected according to the purpose.

  In the first embodiment, a turbocharger has been described as an example of the rotating machine 1. However, the impeller 25 of the first embodiment can be applied to a rotating machine other than the turbocharger.

  7 and 8 are cross-sectional views for explaining the impeller manufacturing method according to the first embodiment. 7 and 8, the same components as those shown in FIGS. 1 to 6 are denoted by the same reference numerals. FIG. 9 is a flowchart for explaining the method of manufacturing the impeller according to the first embodiment.

Next, a method for manufacturing the impeller 25 of the first embodiment will be described with reference to FIGS. 2, 3, and 7 to 9.
When the process shown in FIG. 9 is started, in S1, as shown in FIG. 7, a ring member 50 serving as a base material of the reinforcing core piece 35 shown in FIG. 3 is formed.
Specifically, for example, the ring member 50 including the pin insertion portion 51, the first groove group 38, and the second groove group 39 is formed by injection molding using a mold (not shown) (groove). A process including a forming process). As a material of the ring member 50, for example, the reinforcing fiber-containing resin 32 described above is used.
The diameter of the pin insertion part 51 is smaller than the diameter of the boss hole 37 shown in FIG. The pin insertion portion 51 is formed on the front surface 35aA side. The pin insertion portion 51 extends in the axial direction Da. The pin insertion portion 51 </ b> A is formed so as not to penetrate the ring member 50.

  Next, in S2, as shown in FIG. 8, a mold 55 for forming the impeller body 31 is prepared. The mold 55 includes a pin 56 to be inserted into the pin insertion portion 51, a space 55A in which a plurality of blades 33 are formed, an impeller body forming region 55B in which the impeller body 31 is formed, a space 55A and an impeller. And an introduction path 55C for introducing the molten reinforcing fiber-containing resin 32 into the main body forming region 55B. The mold 55 is divided into a plurality of parts.

  Next, in S <b> 3, the ring member 50 and the plurality of blades 33 are accommodated in the mold 55 configured as described above. At this time, the position and posture of the ring member 50 in the mold 55 can be maintained by inserting the pin 56 into the pin insertion portion 51.

Next, in S <b> 4, the reinforcing fiber-containing resin 32 is introduced into the mold 55 through the introduction path 55 </ b> C, and the flow of the reinforcing fiber-containing resin 32 is caused to flow in the radial direction of the ring member 50 by the outer peripheral surface of the ring member 50. Induce.
Thus, by using the ring member 50 provided with the outer peripheral surface 35a that guides the flow of the reinforcing fiber-containing resin 32 in the radial direction of the ring member 50, the reinforcing fiber-containing resin is included along the outer peripheral surface 35a of the ring member 50. The reinforcing fibers 32B included in the resin 32 can be oriented. That is, the orientation of the reinforcing fibers 32B can be controlled by the inclination (shape) of the outer peripheral surface 35a of the ring member 50. Thereby, the intensity | strength of impeller main body 31 itself can be improved.

Thereby, the reinforcing fiber-containing resin 32 is filled by filling the space 55A, the impeller body forming region 55B, and the introduction path 55C with the molten reinforcing fiber-containing resin 32, and curing the reinforcing fiber-containing resin 32 according to the temperature of the mold 55. A resin structure 58 and a plurality of blades 33 are collectively formed.
At this time, the reinforcing fiber-containing resin 32 is embedded in the first and second groove groups 38 and 39 formed in the ring member 50.
The resin structure 58 includes a base material of the impeller body 31 made of the cured reinforcing fiber-containing resin 32.

  Next, in S <b> 5, the structure 61 including the resin structure 58, the ring member 50 integrated with the resin structure 58 and the plurality of blades 33 is taken out from the mold 55.

  Next, in S6, the excess reinforcing fiber-containing resin 32 (the reinforcing fiber-containing resin 32 that does not constitute the impeller body 31) is removed (cut) from the structure 61, and the reinforcing core piece 35 is attached to the portion corresponding to the pin insertion portion 51. A penetrating boss hole 37 is formed. Thereby, the reinforcing core piece 35 provided in the impeller body 31 is formed, and the impeller 25 shown in FIG. 2 is manufactured.

  According to the manufacturing method of the impeller 25 of the first embodiment, the ring member 50 serving as a base material of the reinforcing core piece 35 has the pin insertion portion 51 into which the pin 56 of the mold 55 is inserted, so that the inside of the mold 55 The position and posture of the ring member 50 can be maintained.

  Further, by using the ring member 50 including the outer peripheral surface 35 a that guides the flow of the reinforcing fiber-containing resin 32 in the radial direction of the ring member 50, the reinforcing fiber-containing resin 32 is aligned along the outer peripheral surface 35 a of the ring member 50. It becomes possible to orient the reinforcing fibers 32B included in the. That is, the orientation of the reinforcing fibers 32B can be controlled by the inclination (shape) of the outer peripheral surface 35a of the ring member 50. Thereby, the intensity | strength of impeller main body 31 itself can be improved.

  Moreover, before accommodating the ring member 50 in the metal mold | die 55, the 1st and 2nd groove group by which the reinforcement fiber containing resin 32 is accommodated in the part which contacts the reinforcement fiber containing resin 32 among the ring members 50 is demonstrated. By forming 38 and 39, it becomes possible to obtain an anchor effect by the reinforcing fiber-containing resin 32 filling the first and second groove groups 38 and 39.

  This makes it possible to improve the adhesion at the interface between the impeller body 31 and the reinforcing core piece 35, so that even when the impeller 25 rotates at a high speed, peeling at the interface between the impeller body 31 and the reinforcing core piece 35 is sufficiently suppressed. can do.

  Further, the first and second groove groups 38 and 39 filled with the reinforcing fiber-containing resin 32 are formed in the ring member 50, so that the grooves constituting the first and second groove groups 38 and 39 are extended. It becomes possible to orient the longitudinal direction of the reinforcing fiber in the direction. Thereby, the reinforcing fiber-containing resin filling the plurality of grooves can function as a reinforcing rib.

In the first embodiment, the case where the pin insertion portion 51 does not penetrate the ring member 50 has been described as an example. However, even when the pin insertion portion 51 penetrates the ring member 50, the first embodiment described above is used. The effect similar to the manufacturing method of the form impeller 25 can be acquired.
In the first embodiment, as an example, the case where the plurality of blades 33 and the resin structure 58 are integrally formed has been described as an example. However, the plurality of blades 33 may be separated from the resin structure 58. Good. In this case, the plurality of blades 33 are arranged in the mold 55 before the resin structure 58 is formed.

(Second Embodiment)
FIG. 10 is a cross-sectional view of an impeller according to a second embodiment of the present invention. 10, the same components as those in the structure shown in FIG.
FIG. 11 is an enlarged cross-sectional view of a portion surrounded by the region F in the structure shown in FIG. In FIG. 11, the same components as those shown in FIGS. 6 and 10 are denoted by the same reference numerals.

With reference to FIG.10 and FIG.11, the impeller 65 of 2nd Embodiment is demonstrated.
The impeller 65 is configured in the same manner as the impeller 25 except that the impeller 65 includes a reinforcing core piece 66 instead of the reinforcing core piece 35 constituting the impeller 25 of the first embodiment.

  The reinforcing core piece 66 is provided in a portion of the impeller body 31 located on the boss hole 31A side. The reinforcing core piece 66 has a first ring portion 71 and a second ring portion 72.

  The first ring portion 71 is disposed on the front surface 31 a side of the impeller body 31. The first ring portion 71 is configured to increase in thickness from the front surface 31 a side to the back surface 31 b side of the impeller body 31. The first ring portion 71 has an inner peripheral surface 71a that partitions a part of the boss hole 31A.

The second ring portion 72 is provided on the back surface 31 b side of the impeller body 31. The second ring portion 72 has a penetrating portion 72A having a diameter larger than that of the boss hole 31A. The through portion 72A is a through hole having a constant diameter.
The reinforcing fiber-containing resin 32 is disposed on the surface 72a of the second ring portion 72 that divides the through portion 72A.

  As described above, the second ring part 72 constituting the reinforcing core piece 66 includes the through part 72A having a diameter larger than that of the boss hole 31A, and on the surface 72a of the second ring part 72 that defines the through part 72A, By disposing the reinforcing fiber-containing resin 32 in a ring shape, the inner side and the outer side of the second ring portion 72 are sandwiched between the reinforcing fiber-containing resin 32, so that the separation between the reinforcing core piece 66 and the impeller body 31 is further suppressed. can do.

  The second ring portion 72 is configured such that the thickness in the radial direction Dr increases from the front surface 31 a side to the back surface 31 b side of the impeller body 31. Thereby, the outer peripheral surface 66a of the reinforcing core piece 66 has a curved shape similar to that of the hub surface 31c.

As the material of the reinforcing core piece 66, a foam material 75 (for example, foam metal, foam resin, fiber reinforced foam resin, or the like) is used.
In this way, by using the foam material 75 as the material of the reinforcing core piece 66, the reinforcing fiber-containing resin 32 enters the plurality of recesses 75A formed on the surface 75a of the foam material 75, so that an anchor effect can be obtained. Become.
Thereby, since it becomes possible to improve the adhesiveness in the interface of the impeller main body 31 and the reinforcement core piece 66, peeling in the interface of the impeller main body 31 and the reinforcement core piece 66 can fully be suppressed.

  Further, as the foam material 75, for example, foamed aluminum which is a foam metal may be used.

  Thus, by using foamed aluminum as the foamed material 75, an anchor effect can be obtained at the interface between the impeller body 31 and the reinforcing core piece 66.

Further, by using foamed aluminum made of aluminum having good thermal conductivity, when the impeller body 31 is formed using the reinforcing fiber-containing resin 32, the central portion of the impeller body 31 in which the reinforcing core piece 66 is disposed is reinforced. It becomes possible to make it easy to cool the fiber-containing resin 32. Thereby, the fall of the yield of the impeller main body 31 by the crack and shrinkage | contraction resulting from the cooling delay of the reinforced fiber containing resin 32 can be suppressed.
Further, since the foamed aluminum is lightweight, the impeller 65 can be reduced in weight.

According to the impeller of the second embodiment, the use of the foamed material 75 as the material of the reinforcing core piece 66 allows the reinforcing fiber-containing resin to enter the plurality of recesses 75A formed on the surface of the foamed material 75. Can be obtained.
Thereby, since it becomes possible to improve the adhesiveness in the interface of the impeller main body 31 and the reinforcement core piece 66, peeling in the interface of the impeller main body 31 and the reinforcement core piece 66 can fully be suppressed.

In addition, you may provide the ring-shaped groove | channel 41 demonstrated in 1st Embodiment, the radiation groove 42, or both the ring-shaped groove 41 and the radiation groove 42 in the reinforcement core piece 66 mentioned above. Specifically, for example, the first groove group 38 described in the first embodiment may be provided on the front surface 66b of the reinforcing core piece 66, and the second groove group 39 may be provided on the back surface 66c of the reinforcing core piece 66.
Thus, by providing a groove in the reinforcing core piece 66, the same effect as that of the reinforcing core piece 35 of the first embodiment can be obtained.

  Further, grooves such as the ring-shaped groove 41 and the radiation groove 42 may be provided on the outer peripheral surface 66 a of the reinforcing core piece 66. That is, the position where the groove is provided can be selected as appropriate.

12 and 13 are cross-sectional views for explaining a method for manufacturing an impeller according to the second embodiment. In FIG. 12, the same components as those shown in FIGS. 10 and 11 are denoted by the same reference numerals. In FIG. 13, the same components as those shown in FIGS. 8, 10, and 11 are denoted by the same reference numerals.
FIG. 14 is a flowchart for explaining an impeller manufacturing method according to the second embodiment. In FIG. 14, the same step numbers are assigned to the same steps as those of the flowchart of FIG. 9 described above.

Next, with reference to FIGS. 12-14, the manufacturing method of the impeller 65 of 2nd Embodiment is demonstrated.
When the process shown in FIG. 14 is started, in S7, as shown in FIG. 12, the reinforcing core piece 66 is formed using the foamed material 75. The reinforcing core piece 66 at this stage has a through hole 66 </ b> A formed in the first ring portion 71. The through-hole 66A is part of the boss hole 31A by being enlarged in diameter.

  The reinforcing core piece 66 can be formed by using a technique such as cutting by cutting, injection molding, or press molding. At this stage, the grooves described in the first embodiment (for example, grooves such as the first groove group 38 and the second groove group 39) may be formed in the reinforcing core piece 66. The groove can also be formed in a separate process using, for example, a cutting method.

Next, in S2, the mold 55 shown in FIG. 8 described in the first embodiment is prepared.
Next, in S <b> 3, the reinforcing core piece 66 is accommodated in the mold 55. At this time, the position and posture of the reinforcing core piece 66 in the mold 55 can be maintained by inserting the pin 56 of the mold 55 into the through hole 66 </ b> A of the reinforcing core piece 66.

Next, in S4, the reinforcing fiber-containing resin 32 is introduced into the mold 55 through the introduction path 55C, and the flow of the reinforcing fiber-containing resin 32 is caused to flow in the radial direction of the reinforcing core piece 66 by the outer peripheral surface 66a of the reinforcing core piece 66. To guide.
Thus, by using the reinforcing core piece 66 provided with the outer peripheral surface 66a that guides the flow of the reinforcing fiber-containing resin 32 in the radial direction of the reinforcing core piece 66, the reinforcing fiber-containing resin is included along the outer peripheral surface 66a of the reinforcing core piece 66. The reinforcing fibers 32B included in the resin 32 can be oriented. That is, the orientation of the reinforcing fibers 32B can be controlled by the inclination (shape) of the outer peripheral surface 66a of the reinforcing core piece 66. Thereby, the intensity | strength of impeller main body 31 itself can be improved.

Then, the space A, the impeller body forming region 55B, and the introduction path 55C are filled with the molten reinforcing fiber-containing resin 32, and the reinforcing fiber-containing resin 32 is cured by the temperature of the mold 55. A resin structure 80 and a plurality of blades 33 are formed.
At this time, as shown in FIG. 11, the reinforcing fiber-containing resin 32 is formed so as to embed a plurality of recesses 75 </ b> A formed in the surface 75 a of the foamed material 75 constituting the reinforcing core piece 66.

Thus, by embedding the plurality of recesses 75A formed on the surface 75a of the foam material 75 (reinforcing core piece 66) with the reinforcing fiber-containing resin 32, an anchor effect can be obtained.
As a result, it becomes possible to improve the adhesion at the interface between the reinforcing fiber-containing resin 32 that is the base material of the impeller body 31 and the reinforcing core piece 66, so that peeling at the interface between the impeller body 31 and the reinforcing core piece 66 is sufficiently performed. Can be suppressed.

In S <b> 1 described above, for example, the reinforcing core piece 66 may be formed using foamed aluminum as the foam material 75.
Thus, the impeller body in which the reinforcing core piece 66 is disposed when the impeller body 31 is formed using the reinforcing fiber-containing resin 32 by using the foamed aluminum made of aluminum having good thermal conductivity as the foam material 75. It becomes possible to make it easy to cool the reinforcing fiber-containing resin 32 at the center of 31. Thereby, the fall of the yield of the impeller main body 31 by the crack and shrinkage | contraction resulting from the cooling delay of the reinforced fiber containing resin 32 can be suppressed.

In addition, in S4, when the groove | channel is formed in the reinforcement core piece 66 which contacts the reinforcement fiber containing resin 32, the reinforcement fiber containing resin 32 is arrange | positioned so that a groove | channel may be embedded.
Thus, by forming a plurality of grooves in a portion of the ring member that comes into contact with the reinforcing fiber-containing resin, it becomes possible to fill the plurality of grooves with the reinforcing fiber-containing resin 32 and obtain an anchor effect. .
This makes it possible to improve the adhesion at the interface between the impeller body 31 and the reinforcing core piece 66, and thus sufficiently suppress the separation at the interface between the impeller body 31 and the reinforcing core piece 66 even when the impeller rotates at a high speed. be able to.

  Next, in S <b> 5, the structure 83 including the resin structure 80, the reinforcing core piece 66 integrated with the resin structure 80 and the plurality of blades 33 is taken out from the mold 55.

  Next, in S6, the excess reinforcing fiber-containing resin 32 (the reinforcing fiber-containing resin 32 that does not constitute the impeller body 31) is removed (cut) from the structure 83, and the reinforcing core piece 66 is passed through the portion corresponding to the through hole 66A. A boss hole 37A is formed. Thereby, the impeller 65 shown in FIG. 10 is manufactured.

According to the method for manufacturing the impeller 65 of the second embodiment, the foaming material 75 is formed when the reinforcing fiber-containing resin 32 is introduced into the mold 55 by forming the reinforcing core piece 66 using the foaming material 75. Since the plurality of recesses 75A formed on the surface (surface of the reinforcing core piece 66) are embedded with the reinforcing fiber-containing resin 32, an anchor effect can be obtained.
As a result, it becomes possible to improve the adhesion at the interface between the reinforcing fiber-containing resin 32 that is the base material of the impeller body 31 and the reinforcing core piece 66, so that peeling at the interface between the impeller body 31 and the reinforcing core piece 66 is sufficiently performed. Can be suppressed.

  The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to such specific embodiments, and various modifications can be made within the scope of the present invention described in the claims. Deformation / change is possible.

  DESCRIPTION OF SYMBOLS 1 ... Rotary machine, 2 ... Rotating shaft, 3 ... Turbine, 4 ... Compressor, 5 ... Housing connection part, 6 ... Bearing, 11 ... Turbine housing, 12 ... Scroll passage, 13 ... Discharge port, 14 ... Turbine impeller, 15 ... turbine blade, 21 ... compressor housing, 22 ... compressor passage, 23 ... suction port, 25, 65 ... impeller, 31 ... impeller body, 31a, 35aA, 66b ... front, 31b, 35aB, 66c ... back, 31c ... Hub surface, 31A, 37 ... boss hole, 32 ... reinforced fiber-containing resin, 32A ... resin, 32B ... reinforced fiber, 33 ... blade, 35, 66 ... reinforcing core piece, 35a, 66a ... outer peripheral surface, 35b ... inner peripheral surface, 38 ... 1st groove group, 39 ... 2nd groove group, 41 ... Ring-shaped groove, 42 ... Radiation groove, 50 ... Ring member, 51 ... Pin insertion part, 55 ... Mold, 56 ... Pin, 55 ... space, 55B ... impeller formation region, 55C ... introduction path, 58, 80 ... resin structure, 61, 83 ... structure, 66A ... through hole, 71 ... first ring portion, 71a ... inner peripheral surface, 72a ... Surface, 72 ... second ring portion, 72A ... through portion, 75 ... foam material, 75a ... surface, 75A ... recess, AR ... air, Da ... axial direction, Dc ... circumferential direction, Dr ... radial direction, G ... exhaust gas , O ... axis

Claims (23)

An impeller body that is in the shape of a truncated cone, has a boss hole and a hub surface penetrating the center portion, and is composed of a reinforcing fiber-containing resin;
Blades provided on the hub surface of the impeller body, and a plurality of blades arranged in the circumferential direction of the impeller body;
Among the back side of the impeller body, the reinforcing core piece is provided in a portion located on the boss hole side, and an inner peripheral surface defines a part of the boss hole;
With
The reinforcing core piece is an impeller having an outer peripheral surface that guides the flow of the reinforcing fiber-containing resin located on the back side of the impeller body in the radial direction of the reinforcing core piece.   The said reinforcing core piece is an impeller which has the some groove | channel in which the said reinforced fiber containing resin is accommodated in the part which contacts the said impeller main body.   3. The impeller according to claim 2, wherein the plurality of grooves are provided in a portion of the reinforcing core piece that is located on a front side of the impeller body and a portion that is located on a back side of the impeller body.   The impeller according to claim 2 or 3, wherein the plurality of grooves include ring-shaped grooves arranged in a circumferential direction of the impeller body.   The impeller according to any one of claims 2 to 4, wherein the plurality of grooves include radial grooves arranged radially in a radial direction of the impeller body.   The impeller according to any one of claims 2 to 5, wherein the material of the reinforcing core piece is the same type of reinforcing fiber-containing resin as the reinforcing fiber-containing resin.   The impeller according to any one of claims 2 to 5, wherein the material of the reinforcing core piece is a foam material.   The impeller according to claim 7, wherein the foam material is foam aluminum. An impeller body that is in the shape of a truncated cone, has a boss hole and a hub surface penetrating the center portion, and is composed of a reinforcing fiber-containing resin;
Blades provided on the hub surface of the impeller body, and a plurality of blades arranged in the circumferential direction of the impeller body;
Among the impeller body, a reinforcing core piece that is provided in a portion located on the boss hole side, and an inner peripheral surface defines a part of the boss hole;
With
The reinforcing core piece includes an outer peripheral surface that guides the flow of the reinforcing fiber-containing resin located on the back side of the impeller body in the radial direction of the reinforcing core piece,
The material of the reinforcing core piece is an impeller that is a foam material.   The impeller according to claim 9, wherein the foam material is foam aluminum. The reinforcing core piece is provided on the front surface side of the impeller body, and includes a first ring portion including the inner peripheral surface, a through portion provided on the back surface side of the impeller body and having a diameter larger than that of the boss hole. A second ring part including,
The impeller according to claim 9 or 10, wherein the reinforcing fiber-containing resin is arranged in a ring shape on a surface of the second ring portion that defines the penetrating portion.   The impeller according to any one of claims 9 to 11, wherein the reinforcing core piece has a plurality of grooves in which the reinforcing fiber-containing resin is accommodated in a portion in contact with the impeller body.   The impeller according to claim 12, wherein the plurality of grooves include ring-shaped grooves arranged in a circumferential direction of the impeller body.   The impeller according to claim 12 or 13, wherein the plurality of grooves include radial grooves arranged radially in a radial direction of the impeller body. The impeller according to any one of claims 1 to 14,
A rotating shaft that is inserted into the boss hole of the impeller and rotates the impeller;
Rotating machine with A step of inserting a mold pin into a pin insertion portion of a ring member which is a base material of the reinforcing core piece;
Introducing the molten reinforcing fiber-containing resin into the mold, and guiding the flow of the reinforcing fiber-containing resin in the radial direction of the ring member by the outer peripheral surface of the ring member;
Forming the base material of the impeller body in the impeller body forming region in the mold by curing the molten reinforcing fiber-containing resin, and forming a plurality of blades integrated with the impeller body;
Taking out the base material of the impeller body from the mold, a ring member provided in the base material of the impeller body, and a structure in which a plurality of blades are integrated;
Removing the excess reinforcing fiber-containing resin from the structure, and forming a boss hole penetrating the ring member in a portion corresponding to the pin insertion portion;
An impeller manufacturing method comprising:   Before accommodating the ring member in the mold, a groove forming step of forming a plurality of grooves in which the reinforcing fiber-containing resin is accommodated in a portion of the ring member that comes into contact with the reinforcing fiber-containing resin. The impeller manufacturing method of Claim 17 containing.   18. The impeller manufacturing according to claim 17, wherein, in the groove forming step, the plurality of grooves are formed in a portion of the ring member located on a front surface side of the impeller body and a portion located on a back surface side of the impeller body. Method.   19. The impeller according to claim 17 or 18, wherein, in the groove forming step, a ring-shaped groove disposed in a circumferential direction of the impeller body and a radial groove disposed radially in the radial direction of the impeller body are formed. Production method. Forming a reinforcing core piece having a through hole penetrating the central portion;
Inserting a mold pin into the through hole of the reinforcing core piece;
Introducing the reinforcing fiber-containing resin into the mold, and guiding the flow of the reinforcing fiber-containing resin in the radial direction of the reinforcing core piece by the outer peripheral surface of the reinforcing core piece;
Forming the base material of the impeller body in the impeller body forming region in the mold by curing the reinforcing fiber-containing resin, and forming a plurality of blades integrated with the impeller body;
Removing the base material of the impeller body from the mold, the reinforcing core piece provided in the base material of the impeller body, and a structure in which the plurality of blades are integrated;
Removing the excess reinforcing fiber-containing resin from the structure, and forming a boss hole having a diameter larger than that of the through hole in a portion corresponding to the through hole;
With
In the step of forming the reinforcing core piece, an impeller manufacturing method in which the reinforcing core piece is formed using a foam material.   21. The impeller manufacturing method according to claim 20, wherein in the step of forming the reinforcing core piece, foamed aluminum is used as the foamed material.   The step of forming the reinforcing core piece includes a first ring portion including an inner peripheral surface defining the through hole and a second ring portion including a through portion having a diameter larger than that of the through hole. The method for manufacturing an impeller according to claim 20 or 21, wherein the reinforcing core piece is formed.   The method of manufacturing an impeller according to any one of claims 20 to 22, wherein in the step of forming the reinforcing core piece, a plurality of grooves are formed in a portion of the reinforcing core piece that contacts the reinforcing fiber-containing resin.

Images