JP2012122485A - Blisk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blisk for an axial air machine which can damp vibrations generating in a plane by use of friction.SOLUTION: The blisk 10 constitutes a rotor of the axial air machine, and a plane 20 and a rotor disk 30 are integrally formed. The blisk 10 has a friction ring 60 which extends in a peripheral direction of a rotor axis of rotation, comes into contact with a platform part 33 of the rotor disk 30 from the inside in a radial direction of the rotor axis of rotation, and can generate friction with the rotor disk 30. When the rotor rotates, a centrifugal force directing to the outside in the radial direction of the rotor axis of rotation acts on the friction ring 60 so that it can be pressed against the platform part 33 of the rotor disk 30. Even if the plane 20 vibrates, the blisk 10 deforms, and a relative displacement occurs between the rotor disk 30 and the friction ring 60, a friction force occurs in a direction of suppressing the displacement between the rotor disk 30 and the friction ring 60.

Description

  The present invention relates to a blisk in which a blade and a rotor disk forming a rotor are integrally formed and used in an axial-flow type air machine such as a turbine or a compressor.

  An aircraft jet engine, a gas turbine, a steam turbine, and the like usually have an axial air machine such as a turbine or a compressor. Such an axial flow type air machine usually has a rotor which is a rotating body having blades (moving blades) arranged on the outer periphery.

  In order to configure such a rotor, the rotor is divided into a plurality of rotor disks, which are disk-shaped members, and the blades arranged on the outer periphery of each rotor disk. A technique is known in which a combined body is arranged and connected, and a plurality of combined bodies are connected in a row in the axial direction of the rotor rotation shaft (see, for example, Patent Documents 1 and 2).

  In the following Patent Documents 1 and 2, a turbine rotor blade and a rotor disk (disk) are formed as separate bodies, respectively, and a blade implantation part (blade root) is formed in a blade groove formed on the outer periphery of the rotor disk. A technique is described in which the rotor disk and the blades are coupled by fitting the rotor disk.

  Also, conventionally, a blade in blade (Blisk), which is a combined body in which the rotor disk and blades are integrally molded, is formed by machining and precision casting, and this is arranged in the axial direction of the rotor rotation axis. There is known a technique for constructing a rotor of an axial-flow type pneumatic machine by overlapping and joining together.

Japanese Utility Model Publication No. 6-18602 Japanese Patent Laid-Open No. 6-26302

  In the axial flow type air machine as described above, in order to suppress blade vibration, Patent Document 1 discloses that an elastic vibration damping material is disposed between the blade roots (platforms) of adjacent blades. A technique for attenuating vibration generated in a blade has been proposed. Patent Document 2 proposes a technique for attenuating vibrations of a blade by disposing an elastic body between a rotor disk groove and a blade implantation portion.

  However, in the techniques described in Patent Documents 1 and 2, since it is necessary to separately manufacture and combine the rotor disk and the blade, the rotor is manufactured by forming a blisk that integrally molds the rotor disk and the blade. There is a problem that the necessary cost is higher than in the case.

  On the other hand, when the rotor is configured with the above blisk, the vibration of the blade cannot be damped by utilizing the friction generated between the blade root and the blade groove as in Patent Documents 1 and 2. A technology to attenuate blade vibration by connecting adjacent blades of blisk with loose wires has also been proposed. However, if this technology is used, a structure and processing for attaching loose wires to the blades are required. This is not preferable. Therefore, when a rotor of an axial-flow type air machine is configured by blisk, there is a demand for a technique for attenuating vibration generated in the blade during operation of the axial-flow type air machine without adding a new structure to the blade. .

  This invention is made in view of the above, Comprising: It aims at providing the blisk for axial-flow-type air machines which can attenuate the vibration which arises in a blade | wing using friction.

  In order to achieve the above object, a blisk according to the present invention is a blisk used in an axial-flow type air machine, in which blades constituting a rotor and a rotor disk are integrally formed, and the circumferential direction of the rotor rotation shaft A friction member that is in contact with the rotor disk from the inside in the radial direction of the rotor rotation shaft and is capable of generating friction between the rotor disk and the rotor disk in the circumferential direction of the rotor rotation shaft. A circumferential groove is formed so that the friction member can be inserted into the rotor disk, and the rotor disk has a larger width in the rotor rotation axis direction than the radially inner side of the rotor rotation axis. It has a platform portion to be coupled, and the circumferential groove is formed in the platform portion, and the circumferential groove is configured such that the groove bottom faces the outer side in the axial direction of the rotor rotation shaft. Do

  In the blisk according to the present invention, the friction member has a flat plate shape and can be inserted into the circumferential groove so as to be in contact with the radially outer side wall of the rotor rotation shaft.

  In the blisk according to the present invention, the surface of the friction member that contacts the circumferential groove can be made of an elastic material.

  In the blisk according to the present invention, the friction member may be a friction ring having an open end and extending in a C shape.

  According to the blisk of the present invention, there is a friction member that extends in the circumferential direction of the rotor rotation shaft, contacts the rotor disk from the radially inner side of the rotor rotation shaft, and can generate friction with the rotor disk. The rotor disk is formed with a circumferential groove that extends in the circumferential direction of the rotor rotation shaft and into which a friction member can be inserted. The rotor rotation axis direction has a large width and a platform portion to which the blades are coupled. The circumferential groove is formed in the platform portion, and the circumferential groove has a groove bottom at the axis of the rotor rotation axis. Since it is configured to face outward in the direction, the friction member can be easily inserted into the circumferential groove.

  In the blisk according to the present invention, the friction member has a flat plate shape and is inserted into the circumferential groove so as to be in contact with the radially outer side wall of the rotor rotation shaft, so that the friction member can be easily manufactured. It is possible to make good contact with the radially outer side wall of the circumferential groove.

  In the blisk according to the present invention, the surface in contact with the circumferential groove in the friction member is made of an elastic material, so that the coefficient of friction between the circumferential groove and the friction member, that is, the circumferential groove, The friction force generated between the friction member and the friction member can be increased.

  In the blisk according to the present invention, the friction member is a friction ring having an open end and extending in a C shape, so that the rotor rotates around the rotor rotation axis and centrifugal force is applied to the friction member. When acting, the friction member can be favorably pressed against the rotor disk from the radially inner side of the rotor rotation shaft.

It is a perspective view which shows the whole structure of the blisk concerning Example 1. FIG. It is a fragmentary perspective view of the blisk concerning Example 1. FIG. It is a fragmentary sectional view of the blisk concerning Example 1, and is a sectional view by the AA line of FIG. It is a component diagram of the friction member provided in the blisk concerning Example 1. It is a fragmentary sectional view of the blisk concerning Example 2, and is a sectional view by the AA line of FIG. It is a component diagram of the friction member provided in the blisk concerning Example 2. It is a fragmentary sectional view of the blisk of the modification which concerns on Example 2, and is sectional drawing by the AA line of FIG. It is a component diagram of the friction member provided in the blisk of the modification which concerns on Example 2. FIG. It is a fragmentary sectional view of the blisk concerning Example 3, and is a sectional view by the AA line of FIG. It is a component diagram of the friction member provided in the blisk concerning Example 3. It is a fragmentary sectional view of the blisk of the modification which concerns on Example 3, and is sectional drawing by the AA line of FIG. It is a component diagram of the friction member provided in the blisk of the modification which concerns on Example 3. FIG. It is a fragmentary sectional view of the blisk concerning Example 4, and is a sectional view by the AA line of FIG. It is the side view of a blisk seen from the direction shown by arrow E in FIG. In the blisk which concerns on Example 4, it is a figure which shows an example of the arrangement pattern of the circumferential groove | channel by which the axial direction outer side wall of the rotor rotating shaft was excised.

  Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same.

Example 1
A blisk for an axial-flow air machine according to the present embodiment will be described with reference to FIGS. FIG. 1 is a perspective view showing the overall configuration of the blisk. FIG. 2 is a partial perspective view of the blisk. 3 is a partial cross-sectional view of the blisk taken along line AA in FIG. FIG. 4 is a component diagram of a friction member provided in the blisk. In FIG. 3, the right side of the alternate long and short dash line B shows a state where the friction member is inserted into the circumferential groove, and the left side of the alternate long and short dash line B shows a state before the friction member is inserted into the circumferential groove. Show.

  The blisk 10 according to the present embodiment is used in a rotor of an axial-flow type air machine such as an aircraft engine compressor or turbine. The axial flow type air machine includes a compressor and a turbine of a gas turbine and a steam turbine.

  As shown in FIG. 1, the blisk 10 includes a moving blade (hereinafter simply referred to as “wing”) 20 and a rotor disk 30 in which a plurality of blades 20 are arranged on the outer periphery. The rotor disk 30 is integrally formed by cutting or casting. That is, the blisk 10 is a structure in which the wing 20 and the rotor disk 30 are integrally formed. A plurality of blisks 10 are overlapped and connected in a row in the axial direction of the rotor rotation shaft indicated by a one-dot chain line C in the drawing to constitute a rotor (not shown) of an axial-flow pneumatic machine. .

  As shown in FIG. 1 and FIG. 2, in the rotor disk 30, the width in the axial direction of the rotor rotation shaft is larger on the outer side in the radial direction of the rotor rotation shaft (indicated by arrow R in the figure) than on the inner side in the radial direction. The platform portion 33 is set so as to extend over the entire circumference. In the platform portion 33, a radially inner end of the rotor rotation shaft of the blade 20, a so-called blade root, is coupled to the radially outer side of the rotor rotation shaft.

  As shown in FIG. 3, a groove (hereinafter referred to as a circumferential groove) 40 extending in the circumferential direction of the rotor rotation shaft is formed in the platform portion 33 of the rotor disk 30 over the entire circumference. The circumferential groove 40 is formed by digging down from the outer surface of the platform 33 to the radially outer side from the radially inner surface 35 of the rotor rotation shaft. That is, the circumferential groove 40 is configured such that the groove bottom 44 faces the radially inner side of the rotor rotation shaft. The circumferential groove 40 is surrounded by side walls 45 and 46 formed on both sides in the axial direction of the rotor rotation axis of the groove bottom 44 and the groove bottom 44, and a space for accommodating a friction ring 60 described later is formed. . In the blisk 10, the circumferential groove 40 is formed to have a plane-symmetric shape on both sides in the axial direction across a virtual plane (indicated by a dashed line B in the figure) orthogonal to the rotor rotation axis.

  As shown in FIGS. 3 and 4, the circumferential groove 40 configured as described above is in contact with the platform portion 33 of the rotor disk 30 from the radially inner side to the outer side of the rotor rotation shaft. As a friction member capable of generating friction with the portion 33, a friction ring 60 having a substantially circular cross section and extending in the circumferential direction of the rotor rotation shaft is provided. The friction ring 60 has an open end 62 and extends in a C shape. The friction ring 60 can be manufactured by bending a metal bar-like member. The friction ring 60 can be inserted into the circumferential groove 40 with a force to close the open end 62.

  When the friction ring 60 is inserted into the circumferential groove 40, its outer surface 66 contacts the groove bottom 44 and the side walls 46, 45 of the circumferential groove 40. When the axial flow type air machine is operated and the rotor and blisk 10 rotate about the rotor rotation axis, centrifugal force acting radially outward of the rotor rotation axis acts on the friction ring 60, and the outer surface 66. Is pressed against the groove bottom 44 which is more radially outward.

  As a result, even if the blade 20 vibrates and the blisk 10 is deformed to cause a relative displacement between the circumferential groove 40 and the friction ring 60, the gap between the groove bottom 44 and the outer surface 66 is A frictional force is generated in a direction that suppresses the displacement. By this frictional force, the vibration of the blade 20 can be attenuated, and the vibration stress acting on the blisk 10 can be reduced.

  The blisk 10 according to the present embodiment is a blisk 10 that is used in an axial-flow type air machine, in which blades 20 and a rotor disk 30 constituting a rotor are integrally formed, and extends in the circumferential direction of the rotor rotation shaft. Since the friction ring 60 is provided as a friction member that is in contact with the platform portion 33 of the rotor disk 30 from the radially inner side of the rotor rotation shaft and can generate friction with the rotor disk 30, the rotor rotates the rotor. When rotating around the shaft, a centrifugal force acting radially outward of the rotor rotation shaft acts on the friction ring 60 and is pressed against the platform portion 33 of the rotor disk 30. Even if the blade 20 vibrates and the blisk 10 is deformed to cause a relative displacement between the rotor disk 30 and the friction ring 60, the displacement is suppressed between the rotor disk 30 and the friction ring 60. A friction force is generated in the direction. This frictional force can attenuate the vibration of the blade 20.

  Further, in the blisk 10 according to the present embodiment, the rotor disk 30 is formed with a circumferential groove 40 that extends in the circumferential direction of the rotor rotation shaft and into which the friction ring 60 (friction member) can be inserted. The circumferential groove 40 accommodates the friction ring 60 and can be in good contact with the friction ring 60 to generate a frictional force.

  Further, in the blisk 10 according to the present embodiment, the rotor disk 30 is coupled to the blade 20 with the rotor disk 30 having a larger width in the rotor rotation shaft direction than the radially inner side on the radially outer side of the rotor rotation shaft. Since the platform portion 33 is provided and the circumferential groove 40 is formed in the platform portion 33, the friction ring 60 provided in the rotor disk 30 is provided on the friction ring 60 when the rotor rotates about the rotor rotation axis. The acting centrifugal force can be made as high as possible, and a high frictional force can be generated between the rotor disk 30 and the rotor disk 30.

  Further, in the blisk 10 according to the present embodiment, the circumferential groove 40 is configured such that the groove bottom 44 faces the radially inner side of the rotor rotation shaft, so that the rotor rotates around the rotor rotation shaft. In this case, the circumferential groove 40 can reliably hold the friction ring 60 and generate a frictional force with the friction ring 60.

  Further, in the blisk 10 according to the present embodiment, the friction member is the friction ring 60 having the open end 62 and extending in a C shape. Therefore, the rotor rotates about the rotor rotation axis to generate friction. When centrifugal force is applied to the ring 60, the friction ring 60 can be favorably pressed against the rotor disk 30 from the radially inner side to the outer side of the rotor rotation shaft.

(Example 2)
A blisk for an axial flow type air machine according to the present embodiment will be described with reference to FIGS. FIG. 5 is a partial cross-sectional view of the blisk taken along line AA in FIG. FIG. 6 is a component diagram of a friction member provided in the blisk. FIG. 7 is a partial cross-sectional view of a variation blisk, taken along line AA in FIG. FIG. 8 is a component diagram of a friction member provided in a blisk of a modified example. 5 and 7, the right side of the alternate long and short dash line B shows a state in which the friction member is inserted into the circumferential groove, and the left side of the alternate long and short dash line B is before the friction member is inserted into the circumferential groove. Shows the state.

  The blisk 10B according to the present embodiment is an embodiment in that the groove bottom 44B of the circumferential groove 40B and the friction ring 70 are formed in a substantially arc shape that is curved outwardly in the radial direction of the rotor rotation shaft. Unlike 1, the details will be described below. In addition, about the structure substantially common with Example 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 5, in the blisk 10 </ b> B according to the present embodiment, a circumferential groove 40 </ b> B extending in the circumferential direction of the rotor rotation shaft is formed in the platform portion 33 of the rotor disk 30 over the entire circumference. The circumferential groove 40 </ b> B is formed by being dug down radially outward from the radially inner surface 35 of the rotor rotation shaft of the platform portion 33. The groove bottom 44B of the circumferential groove 40B is convex and curved outward in the radial direction of the rotor rotation shaft, and is configured to face the radially inner side of the rotor rotation shaft. The groove bottom 44B is connected to the radially inner surface 35.

  As shown in FIGS. 5 and 6, the circumferential groove 40 </ b> B configured as described above is in contact with the platform portion 33 of the rotor disk 30 and serves as a friction member capable of generating friction with the platform portion 33. A friction ring 70 having a substantially arc shape in cross section and extending in the circumferential direction of the rotor rotation shaft is provided. The friction ring 70 is made of metal, and can be manufactured by bending a rectangular plate-shaped member so that its cross section has a substantially arc shape and then bending it in the longitudinal direction. The friction ring 70 is configured such that the curved shape of the outer surface 75 thereof substantially matches the curved shape of the groove bottom 44B of the circumferential groove 40B.

  When the friction ring 70 is inserted into the circumferential groove 40B, the outer surface 75 on the radially outer side contacts the groove bottom 44B over the entire surface. When the blisk 10B rotates about the rotor rotation axis, centrifugal force acting radially outward of the rotor rotation axis acts on the friction ring 70, and the outer surface 75 is pressed against the groove bottom 44B.

  As a result, even if the blade 20 vibrates and the blisk 10B is deformed to cause a relative displacement between the circumferential groove 44B and the friction ring 70, the gap between the groove bottom 44B and the outer surface 75 is A frictional force is generated in a direction that suppresses the displacement. With this frictional force, the vibration of the blade 20 can be attenuated, and the vibration stress acting on the blisk 10B can be reduced.

  In the blisk 10 </ b> B according to the present embodiment, the groove bottom 44 </ b> B of the circumferential groove 40 </ b> B and the outer surface 75 of the friction ring 70 are in contact with each other, so that the frictional force is excellent between the circumferential groove 40 </ b> B and the friction ring 70. Thus, the vibration of the blade 20 can be damped.

  Further, in order to further increase the frictional force generated between the circumferential groove and the friction ring, as shown in FIGS. 7 and 8, in the blisk 10B of the modified example, the friction ring 70B is placed on the plate body 74. A coating layer 76 is provided. 7 and 8, the coating layer 76 is indicated by hatching.

  The coating layer 76 is made of an elastic body (elastomer) such as a rubber-based material, and is preferably made of a viscoelastic body having viscosity, and functions as a vibration damping material. In the friction ring 70B, the coating layer 76 is coated on the outer surface 75 of the friction ring 70 described above. In other words, the outer surface 78 of the friction ring 70 </ b> B according to the modified example is configured by the elastic coating layer 76.

  As a result, the friction coefficient between the outer surface 78 of the friction ring 70B and the groove bottom 44B of the circumferential groove 40B of the platform portion 33 is increased, and the frictional force generated between the circumferential groove 40B and the friction ring 70B. Is increased as compared with the case of using the friction ring 70 described above. Thereby, the vibration of the blade 20 can be attenuated satisfactorily.

  Thus, in the blisk 10B according to the present embodiment, the groove bottom 44B of the circumferential groove 40B and the friction ring 70 as the friction member have a substantially arc shape that curves and curves outward in the radial direction of the rotor rotation shaft. Therefore, the contact area between the groove bottom 44B and the friction ring 70 can be ensured as much as possible, and a friction force can be generated between the groove bottom 44B and the friction ring 70.

  Moreover, since the blisk 10B of the modified example according to the present embodiment is such that the surface 78 in contact with the circumferential groove 40B of the friction ring 70B is composed of the elastic coating layer 76, the circumferential groove 40B The coefficient of friction between the friction ring 70B, that is, the friction force generated between the circumferential groove 40B and the friction ring 70B can be increased as compared with the case where the above-described friction ring 70 is used.

(Example 3)
A blisk for an axial flow type air machine according to the present embodiment will be described with reference to FIGS. 9 is a partial cross-sectional view of the blisk taken along line AA in FIG. FIG. 10 is a component diagram of a friction member provided in the blisk. FIG. 11 is a partial cross-sectional view of a variation blisk, taken along line AA in FIG. FIG. 12 is a component diagram of a friction member provided in a blisk of a modified example. 9 and 11, the right side of the alternate long and short dash line B shows a state where the friction member is inserted into the circumferential groove, and the left side of the alternate long and short dash line B is before the friction member is inserted into the circumferential groove. Shows the state.

  The blisk 10C according to the present embodiment is different from the first embodiment in that the circumferential groove 40C is configured such that the groove bottom 44C faces the outer side in the axial direction of the rotor rotation shaft, and the details will be described below. . In addition, about the structure substantially common with Example 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 9, in the blisk 10 </ b> C according to the present embodiment, the circumferential groove 40 </ b> C is directed from the axially outer surface 36 of the rotor rotating shaft constituting the platform portion 33 of the rotor disk 30 toward the axially inner side. It is constructed by digging down. That is, the groove bottom 44C of the circumferential groove 40C is configured to face the axially outer side of the rotor rotation shaft. The circumferential groove 40 </ b> C is surrounded by a groove bottom 44 </ b> C and side walls 47 and 48 formed on both sides of the groove bottom 44 </ b> C in the radial direction of the rotor rotation shaft, thereby forming a space for accommodating the friction ring 80.

  As shown in FIGS. 9 and 10, the circumferential groove 40 </ b> C configured as described above is in contact with the platform portion 33 of the rotor disk 30 and serves as a friction member capable of generating friction with the platform portion 33. A friction ring 80 is provided. The friction ring 80 has an open end 82, has a C shape, and extends in the circumferential direction of the rotor rotation shaft. The friction ring 80 is made of metal and can be manufactured by bending a rectangular plate-shaped member in the longitudinal direction.

  When the friction ring 80 is inserted into the circumferential groove 40C, the outer surface 85 on the outer side in the radial direction contacts the entire side wall 48 on the outer side in the radial direction of the circumferential groove 40C. When the blisk 10 </ b> C rotates about the rotor rotation axis, centrifugal force acting radially outward of the rotor rotation axis acts on the friction ring 80, and the outer surface 85 is pressed against the side wall 48 of the circumferential groove 40 </ b> C.

  As a result, even if the blade 20 vibrates and the blisk 10C is deformed to cause a relative displacement between the circumferential groove 40C and the friction ring 80, the side wall 48 and the outer surface 85 of the circumferential groove 40C In the meantime, a frictional force in a direction to suppress the displacement is generated. With this frictional force, the vibration of the blade 20 can be attenuated, and the vibration stress acting on the blisk 10C can be reduced.

  In the blisk 10C according to the present embodiment, since the side wall 48 of the circumferential groove 40C and the outer surface 85 of the flat friction ring 80 are in contact with each other, the friction ring 80 can be easily manufactured and the friction with the circumferential groove 40C can be reduced. The surface with which the ring 80 contacts can be sufficiently secured. Thereby, it is possible to satisfactorily generate a frictional force between the circumferential groove 40 </ b> C and the friction ring 80 and to attenuate the vibration of the blade 20.

  Further, in order to further increase the frictional force generated between the circumferential groove and the friction ring, as shown in FIGS. 11 and 12, in the blisk 10C of the modified example, the upper side of the plate body 84 of the friction ring 80B. A coating layer 86 is provided. 11 and 12, the coating layer 86 is indicated by hatching.

  The coating layer 86 is made of an elastic body such as a rubber-based material, preferably a viscous viscoelastic body. In the friction ring 80B of the modified example, the coating layer 86 is coated on the outer surface 85 of the friction ring 80 described above. That is, the outer surface 88 of the friction ring 80B is composed of an elastic coating layer 86.

  As a result, the friction coefficient between the outer surface 88 of the friction ring 80B and the side wall 48 of the circumferential groove 40C of the platform portion 33 is increased, and the friction force generated between the circumferential groove 40C and the friction ring 80B is increased. , Compared to the case where the above-described friction ring 80 is used. Thereby, the vibration of the blade 20 can be attenuated satisfactorily.

  Thus, in the blisk 10C according to the present embodiment, the circumferential groove 40C is configured such that the groove bottom 44C faces the outside in the axial direction of the rotor rotation shaft, so that the friction ring 80 (friction member). Can be easily inserted into the circumferential groove 40C.

  Further, in the blisk 10C according to the present embodiment, the friction member has a flat plate shape and is inserted into the circumferential groove 44C so as to contact the radially outer side wall 48 of the rotor rotation shaft. While making the friction ring 80 easy, it is possible to make good contact with the radially outer side wall 48 of the circumferential groove 40C.

Example 4
A blisk for an axial flow type air machine according to the present embodiment will be described with reference to FIGS. 13 is a partial cross-sectional view of a blisk taken along line AA in FIG. FIG. 14 is a side view of the blisk viewed from the direction indicated by arrow E in FIG. FIG. 15 is a diagram illustrating an example of an array pattern of circumferential grooves in which a side wall on the outer side in the axial direction of the rotor rotation shaft is cut away.

  The blisk 10D according to the present embodiment is different from the first embodiment in that a part of the circumferential groove provided in the rotor disk 30 is cut away from the side wall that forms the axial outer side of the rotor rotation shaft. Details will be described below. In addition, about the structure substantially common with Example 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In FIG. 13, on the right side of the alternate long and short dash line B, the axially outer side wall of the circumferential groove is cut off, and the friction member is inserted into the circumferential groove. Shows a state before being cut off and before the friction member is inserted into the circumferential groove.

  As shown in FIGS. 13 and 14, in the blisk 10D according to the present embodiment, the platform portion 33 of the rotor disk 30 includes a circumferential groove 40 having a side wall 46 on the axially outer side of the rotor rotation shaft, and the side wall. A circumferential groove 40D from which 46 is cut out is provided in a mixed manner. The circumferential groove 40 </ b> D is entirely removed from the axially outer portion of the side wall 46 of the circumferential groove 40 described above. That is, a part of the circumferential groove (40, 40D) of the blisk 10D is configured by a circumferential groove 40D in which the side wall 46 is notched. The circumferential groove 40 </ b> D is located on the radially inner side of the rotor rotation shaft on the outer surface constituting the platform portion 33, and from the surface 35 c on the outer side of the rotor rotation shaft in the axial direction from the groove bottom 44. It is dug down to the outside in the direction. The groove bottom 44 of the circumferential groove 40 is connected to a side surface 43 that constitutes the axially outer side of the rotor rotation shaft of the platform portion 33.

  As shown in FIGS. 14 and 15, the circumferential groove 40 having the side wall 46 and the circumferential groove 40 </ b> D from which the side wall 46 is cut are alternately provided in the circumferential direction of the rotor rotation shaft. In the circumferential groove 40 having the side wall 46 and the circumferential groove 40D in which the side wall 46 is cut off, the side wall 45 and the groove bottom 44 on the inner side in the axial direction of the rotor rotating shaft have a common shape, and the rotor is continuous. It is formed on the disk 30.

  A plurality of circumferential grooves 40 </ b> D whose side walls have been removed are provided at a predetermined angle θ around the rotor rotation axis. The circumferential grooves 40D from which the side walls 46 are cut are arranged in the circumferential direction of the rotor rotation shaft in an asymmetric pattern around the rotor rotation shaft.

  Accordingly, when the blade 20 vibrates, the blisk 10D is deformed, and relative displacement occurs between the circumferential groove 40 and the circumferential groove 40D and the friction ring 60, the circumferential groove 40 having the side wall 46 and The frictional force generated between the friction ring 60 and the frictional force generated between the circumferential groove 40D not having the side wall 46 and the friction ring 60 can be made different depending on the part. Since the circumferential grooves 40D without the side walls 46 are arranged in an asymmetric pattern around the rotor rotation axis, it is possible to suppress the occurrence of natural vibration in the blisk 10D using a so-called mistuning effect, The fluid force acting on the blade 20 can amplify the vibration and suppress the occurrence of self-excited vibration of the blade 20 so-called flutter.

  As described above, in the blisk 10D according to the present embodiment, the circumferential groove 40D in which the side wall 46 constituting the outer side in the axial direction of the rotor rotating shaft is cut off and the circumferential groove 40 having the side wall 46 are mixedly provided. Therefore, the frictional force generated between the circumferential groove 40 having the side wall 46 and the friction ring 60 and the frictional force generated between the circumferential groove 40D from which the side wall 46 is cut and the friction ring 60 are obtained. Depending on each part in the circumferential direction of the rotor rotation shaft, it can be different.

  Further, in the blisk 10D according to the present embodiment, the circumferential grooves 40D from which the side walls 46 are cut are arranged in an asymmetric pattern around the rotor rotation axis. It is possible to suppress the occurrence of natural vibration in 10D.

  In each of the above-described embodiments, the circumferential groove (40; 40B; 40C) is formed over the entire circumference in the circumferential direction of the rotor rotation shaft, but is not limited thereto. Absent. It is good also as what forms in C shape according to the shape of a friction ring (60; 70; 70B; 80; 80B).

  In the above-described embodiments, the blisks (10; 10B; 10C; 10D) are formed with circumferential grooves on both sides in the axial direction of the rotor rotation shaft, but are formed only on one side. Also good.

  In each of the above-described embodiments, the friction ring (60; 70; 70B; 80; 80B) serving as a friction member in contact with the rotor disk 30 and extending in the circumferential direction of the rotor rotation shaft has a C-shape having an open end. However, the shape of the friction ring is not limited to this. For example, the friction ring may have a semicircular arc shape, and a plurality of the friction rings may be inserted side by side in the same circumferential groove. The diameter, weight, and cross-sectional shape of the friction ring are appropriately set so that vibration attenuation in the blade 20 is optimal.

10, 10B, 10C, 10D Blisk 20 Blade 30 Rotor disk 33 Platform 40, 40B, 40C, 40D Circumferential groove 44, 44B, 44C Circumferential groove bottom 45 Axial inner side wall 46 Axial outer side wall 47 Radial inner side wall 48 Radial outer side wall 60 Friction ring (friction member)
70, 70B Friction ring (friction member)
76 Coating layer 80, 80B Friction ring (friction member)
86 Coating layer C Rotor rotation shaft R Radial direction of rotor rotation shaft

Claims (4)

A blisk used in an axial flow type air machine, in which a blade and a rotor disk constituting a rotor are integrally formed,
It extends in the circumferential direction of the rotor rotation shaft, has a friction member that comes into contact with the rotor disk from the inside in the radial direction of the rotor rotation shaft and can generate friction with the rotor disk,
The rotor disk is formed with a circumferential groove that extends in the circumferential direction of the rotor rotation shaft and into which a friction member can be inserted.
The rotor disk has a platform portion on the radially outer side of the rotor rotation shaft, in which the width in the rotor rotation shaft direction is set larger than that on the radially inner side and the blades are coupled to each other. Is formed,
The circumferential groove is configured so that the groove bottom faces the axially outer side of the rotor rotation shaft. In the blisk of claim 1,
The friction member has a flat plate shape and is inserted into a circumferential groove so as to contact a radially outer side wall of the rotor rotation shaft. In the blisk according to claim 1 or 2,
A blisk characterized in that the surface of the friction member in contact with the circumferential groove is made of an elastic material. In the blisk according to any one of claims 1 to 3,
The friction member is a friction ring having an open end and extending in a C shape.

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