JP2009068338A - Vibration reduction structure of wing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration reduction structure of a wing capable of providing a sufficiently large vibration damping effect and easily having stable damping zone characteristics. <P>SOLUTION: This vibration reduction structure of a wing comprises a static vane 12 disposed in a fluid passage 7 through which air flows and an inner peripheral shroud 14 and a seal member 20 supporting the inner peripheral end of the static vane 12 on a disk 4. A damper storage chamber 23 is formed between the inner peripheral shroud 14 and the seal member 20. A mesh wire 24 formed by collectively disposing entwined metal fibers is interposed in the damper storage chamber 23 in a compressed state. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a blade vibration reduction structure used in turbomachines, gas turbines, aircraft engines, and the like.

  For example, a stationary blade used in a turbo machine, a gas turbine, an aero engine or the like is disposed in an air flow having a high flow velocity, and thus vibrates due to a large air pressure. Since vibrations of the blades cause damage to the blades and factors that reduce the function of the blades, various vibration reduction structures for the stationary blades have been proposed.

  As shown in FIG. 4, the blade vibration reducing structure according to the first conventional example includes a stationary blade 100 disposed in a space through which a fluid flows, and an inner peripheral shroud fixed to the inner peripheral end of the stationary blade 100. 101, a honeycomb seal portion 102 fitted to the inner peripheral shroud 101, and a leaf spring 104 accommodated in an annular cavity 103 formed between the inner peripheral shroud 101 and the buckling segment 102a of the honeycomb seal portion 102, It has.

  The leaf spring 104 is a metal spring material having an E-shaped cross section, and is accommodated in the annular cavity 104 by bending a plurality of times alternately. One end of the plate spring 104 is pressed against the inner shroud 101 and the other end is pressed against the buckling segment 102a by spring pressure.

  In this blade vibration reduction structure, the vibration from the stationary blade 100 is transmitted from the inner shroud 101 to the honeycomb seal portion 102 via the leaf spring 104. When the vibration is transmitted, one end side and the other end side of the leaf spring 104 are It slides relative to the inner shroud 101 and the buckling segment 102a, and the vibration is attenuated mainly by the external sliding friction of the leaf spring 104.

  The blade vibration reducing structure according to the second conventional example, as shown in FIG. 5, is fixed to a plurality of stationary blades 110 arranged in a space through which a fluid flows and the inner peripheral end of each stationary blade 110. A plurality of inner peripheral shroud pieces 111, 111, a buffer block 112 interposed between adjacent inner peripheral shroud pieces 111, 111, and a leaf spring 113 for biasing the buffer block 112 are provided.

  The buffer block 112 has tapered surfaces 112a and 112a on the left and right sides, and the tapered surfaces 112a and 112a of the adjacent inner shroud pieces 111 and 111 are separated from each other by the spring force of the leaf spring 113. Energized in the direction.

  In this blade vibration reduction structure, the vibration from each stationary blade 110 is transmitted from each inner shroud piece 111, 111 to the buffer block 112. When the vibration is transmitted, the tapered surfaces 112a, 112a of the buffer block 112 are respectively It slides with respect to the inner periphery shroud pieces 111, 111, and the vibration is attenuated mainly by the external sliding friction of the buffer block 112.

  As shown in FIG. 6, the blade vibration reducing structure according to the third conventional example is fitted with a stationary blade 120 arranged in a space through which fluid flows, and an outer peripheral end and an inner peripheral end of the stationary blade 120, respectively. And the outer peripheral shroud 123 and the inner peripheral shroud 124 to which the buffer bodies 121 and 122 on both sides are mounted.

  Each of the shock absorbers 121 and 122 has a damping function such as white metal or FRP, and is formed of a material having lower hardness than the stationary blade 120, the outer peripheral shroud 123, and the inner peripheral shroud 124.

In this blade vibration reduction structure, the vibration from the stationary blade 120 is transmitted to the outer shroud 123 and the inner shroud 124 from the buffer bodies 121 and 122 on both sides. Vibration is attenuated by relative sliding friction.

JP-A-6-346703) JP 2007-40119 A JP-A-8-121108

  However, in the first conventional example, the vibration is attenuated by the external sliding friction between the inner peripheral shroud 101 and the buckling segment 102a of the leaf spring 104, and the main vibration attenuation is the external sliding friction. Can not get a great damping effect. Further, since the vibration attenuation band is changed by the contact pressure between the leaf spring 104, the inner peripheral shroud 101 and the buckling segment 102a, a stable attenuation characteristic cannot be easily obtained. Specifically, the band for attenuating the vibration of the stationary blade 100 cannot be matched with the resonance frequency band of the stationary blade 100, and damage to the stationary blade 100 due to resonance cannot be prevented.

  In the second conventional example, the vibration is attenuated by sliding friction between the buffer block 112 and the inner shroud pieces 111, 111, and a large damping effect is obtained for the same reason as in the first conventional example. And a stable attenuation characteristic cannot be easily obtained.

  In the third conventional example, the vibration is attenuated by the relative sliding friction inside the shock absorbers 121 and 122, and a large damping effect cannot be obtained only by the internal sliding friction.

  Therefore, the present invention has been made to solve the above-described problems, and has a blade vibration reduction structure that can obtain a sufficiently large vibration damping effect and can easily obtain a stable damping characteristic. The purpose is to provide.

  The invention according to claim 1 is provided with a wing disposed in a space in which a fluid flows, and a support portion that supports the wing on a base portion, and between adjacent members from the wing to the base portion, a metal A metal fiber buffer composed of an aggregate of fiber wires is interposed in a compressed state.

  According to a second aspect of the present invention, there is provided the blade vibration reducing structure according to the first aspect, wherein the wing is a part of the spell wing whose both ends are integrally supported by the outer shroud and the inner shroud. The support portion is configured by the outer peripheral shroud and the inner peripheral shroud of the spell wing, and a seal member that maintains airtightness between the inner peripheral shroud and the base, and the metal fiber buffer is The intermediate shroud and the seal member are interposed.

  A third aspect of the present invention is the blade vibration reduction structure according to the second aspect, wherein a buffer body accommodating chamber is formed between the inner shroud and the seal member, and the metal fiber is disposed in the buffer body accommodating chamber. The shock absorber is inserted in a compressed state.

  A fourth aspect of the present invention is the blade vibration reducing structure according to any one of the first to third aspects, wherein the blade is a stationary blade.

  A fifth aspect of the present invention is the blade vibration reduction structure according to any one of the first to fourth aspects, wherein the metal buffer is a mesh wire in which a large number of metal fiber wires are gathered together. It is characterized by that.

  According to the first aspect of the present invention, when the blade is vibrated by the external force from the fluid pressure, the vibration of the blade is transmitted to the base portion via the support portion. The other end side slides with respect to each contact member, and external sliding friction is generated. Since the metal fiber aggregate is a collection of metal fiber wires, relative sliding friction is also generated therein. Therefore, the vibration is attenuated by the external sliding friction and the internal sliding friction of the metal fiber assembly.

  Further, since the metal fiber aggregate attenuates vibration not only by external sliding friction but also by internal sliding friction, the dependence of the vibration damping effect does not greatly depend on the contact pressure with the contact member. As described above, the vibration damping structure of the present invention can obtain a sufficiently large vibration damping effect, and can easily obtain a stable damping characteristic.

  Furthermore, since the metal fiber assembly is composed of a large number of metal fiber wires, it can maintain stable physical characteristics even in a high-temperature atmosphere. It can be used in a high temperature atmosphere.

  According to the invention of claim 2, in addition to the effect of the invention of claim 1, the vibration of the plurality of stationary blades can be attenuated collectively, so that the vibration damping structure can be made compact.

  According to the invention of claim 3, in addition to the effect of the invention of claim 2, it is only necessary to fill the buffer housing chamber with the metal fiber assembly, so that the assembly property of the metal fiber assembly is good. Further, since the vibration attenuation characteristic can be changed by changing the filling amount of the metal fiber aggregate, it is possible to easily change the band of the vibration attenuation characteristic without exchanging the metal fiber aggregate entirely.

  According to the invention of claim 4, in the case of a stationary blade, the same effects as those of the inventions of claims 1 to 3 can be obtained.

  According to the invention of claim 5, in addition to the effects of the inventions of claims 1 to 4, the mesh wire is entangled with metal fiber wires, and the metal fiber wires are reliably and frequently inside. Since relative sliding friction is generated, the vibration damping effect by internal sliding friction is large.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  1 to 3 show an embodiment in which the blade vibration reducing structure of the present invention is applied to a stationary blade in a compressor of a gas turbine. 1 is a front view of the compressor as seen from the air inflow side, FIG. 2 is a cutaway perspective view of the main part of the compressor, and FIG. 3 is an exploded view for explaining a procedure for assembling the binding blade, the seal member, and the mesh wire. It is a perspective view.

  As shown in FIGS. 1 to 3, the compressor 1 of the gas turbine is an axial compression method, and includes a rotating shaft 3 that is rotatably supported by a casing 2. A disk 4 is fixed to the outer periphery of the rotating shaft 3. The disk 4 is composed of a plurality of divided members. On the outer peripheral side of the disk 4, a rotor blade support ring portion 5 is integrally projected with an interval in the axial direction. Concave portions 6 are formed between adjacent blade support ring portions 5 and 5, respectively. The upper surface of each recess 6 is substantially blocked by an inner shroud 14 described below. Between the rotor blade support ring portion 5 and inner shroud 14 of the disk 4 and the cylindrical portion 2a of the casing 2, an air circulation path 7 is formed which is concentric with the rotating shaft 3 and extends in the axial direction. Yes.

  The inner peripheral ends of a number of moving blades 10 are supported on the outer peripheral surfaces of the moving blade support ring portions 5 and 5 at intervals in the circumferential direction. The outer peripheral edge of each rotor blade 10 reaches the vicinity of the inner surface of the cylindrical portion 2 a of the casing 2. A single blade group 10A is constituted by a large number of circumferential blades 10 supported by a single blade support ring portion 5. Each blade group 10 </ b> A rotates in the flow path 7 by the rotation of the disk 4.

  A plurality (for example, 8 to 10) of spelling blades 11 connected on the circumference are arranged in the circulation path 7 and between adjacent blade groups 10A.

  Each of the spelling blades 11 includes a plurality of stationary blades 12 that are arranged at intervals in the circumferential direction, and an outer peripheral shroud 13 that is an arcuate support portion that supports the outer peripheral ends of the plurality of stationary blades 12. And an inner circumferential shroud 14 that is an arcuate support portion that supports the inner circumferential ends of a large number of stationary blades 12. A stationary blade group 12 </ b> A is configured by a large number of stationary blades 12 arranged on the same circumference of the circulation path 7. In this manner, the moving blade groups 10A and the stationary blade groups 12A are alternately arranged in the distribution path 7.

  The outer peripheral shroud 13 has a pair of locking projection walls 13a extending along the arc direction. The pair of locking projection walls 13a are fitted into the locking grooves 2b of the cylindrical portion 2a of the casing 2 by sliding insertion. The inner peripheral shroud 14 has a pair of locking grooves 14a formed by bending. Both ends of the inner peripheral shroud 14 are in close contact with inner surface edges of adjacent blade support ring portions 5 and 5 by an elastic repulsion force of a seal member 20 described below.

  The recess 6 formed between the adjacent blade support ring portions 5 and 5 accommodates a plurality of seal members 20 (the same number as the spell blades 11) connected on the circumference. The seal member 20 includes a locking frame 21 that is bent in a U-shaped cross section, and a seal body 22 that is an arc-shaped elastic structure fixed to the inner peripheral surface of the locking frame 21. A pair of locking projection walls 21 a and 21 a extending along the arc direction are integrally provided at both ends of the locking frame 21. The pair of locking projection walls 21 a and 21 a are slid into the pair of locking grooves 14 a and 14 a of the inner peripheral shroud 14. The pair of locking projection walls 21a, 21a and the pair of locking grooves 14a, 14a are set with a margin that can be shifted in the radial direction in the inserted state.

  The inner surface of the seal body 22 is pressed against a plurality of ribs 4 a protruding from the bottom surface of the recess 6 of the disk 4. Thereby, the space between the inner peripheral shroud 14 and the disk 4 is sealed. The air compressed by the upstream blade group 10A is prevented from being supplied to the downstream blade group 10A without passing through the interior of the stationary blade group 12A.

  From the above configuration, the outer peripheral end side of the stationary blade 12 is supported by the cylindrical portion 2a of the casing 2 as the base portion via the outer peripheral shroud 13 as the support portion. The inner peripheral end side of the stationary blade 12 is supported by the disk 4 as a base portion via an inner shroud 14 as a support portion and a seal member 20.

  Further, a buffer housing chamber 23 is formed between each inner shroud 14 and the locking frame 21 of each seal member 20. In each of the buffer housing chambers 23, mesh wires 24, which are metal fiber aggregates, are arranged in a compressed state.

  The mesh wire 24 has an elongated rectangular parallelepiped shape and is an aggregate in which a large number of metal fiber wires are intertwined. Since the mesh wire 24 is disposed in a compressed state in the buffer housing chamber 23, a large number of metal fiber wires are formed on the inner peripheral surface of the inner peripheral shroud 14 and the outer peripheral surface where the locking frame 21 of the seal member 20 is depressed. Are pressed against each other.

  Next, a procedure for assembling the spell wing 11, the seal member 20, and the mesh wire 24 will be briefly described. As shown in FIG. 3, the spelling blade 11 is inserted into the position of the fluid path 7 between the adjacent blade groups 10A and 10A. The binding blade 11 is inserted into the fluid path 7 while fitting the pair of locking wall portions 13 a and 13 a of the outer peripheral shroud 13 into the pair of locking grooves 2 b and 2 b of the casing 2.

  Next, the seal member 20 is inserted into the recess 6. The seal member 20 is inserted into the recess 6 while the pair of locking projection walls 21 a and 21 a are inserted into the pair of locking grooves 14 a and 14 a of the inner peripheral shroud 14.

  Finally, the mesh wire 24 is inserted into the shock absorber housing chamber 23 formed between the inner peripheral shroud 14 and the seal member 20 while being deformed into a compressed state. This completes it. The mesh wire 24 may be inserted simultaneously with the insertion of the seal member 20 into the recess 6.

  Next, the operation of the compressor 1 assembled in this way will be described. When the rotating shaft 3 rotates, a plurality of stages of blade groups 10 </ b> A rotate in the fluid path 7. The air sucked into the fluid path 7 is gradually pressurized by alternately passing between the moving blade group 10A and the stationary blade group 12A, and is sent downstream as predetermined compressed air.

  In this air flow pumping process, a large air pressure acts on each stationary blade 12, and each stationary blade 12 vibrates by the air pressure. When each stationary blade 12 vibrates, the vibration of each stationary blade 12 is transmitted from the inner peripheral end to the disk 4 via the inner peripheral shroud 14, the mesh wire 24, and the seal member 20. When this vibration is transmitted, the contact portion of the mesh wire 24 that comes into contact with the inner peripheral shroud 14 and the seal member 20 slides against these, and external sliding friction occurs. Further, since the mesh wire 24 is a collection of metal fiber wires, relative sliding friction is also generated inside the mesh wire 24 during vibration transmission. Since the vibration is attenuated by the external sliding friction and the internal sliding friction of the mesh wire 24 as described above, a sufficiently large vibration damping effect can be obtained.

  Further, since the mesh wire 24 attenuates the vibration by the external sliding friction and the internal sliding friction, the dependence of the vibration damping effect does not greatly depend on the contact pressure between the inner peripheral shroud 14 and the seal member 20, and thus a stable attenuation band. Characteristics can be easily obtained. That is, the band in which the vibration of the stationary blade 12 is attenuated can be surely matched with the resonance frequency band of the stationary blade 12, and damage to the stationary blade 12 due to resonance can be prevented.

  In this embodiment, the stationary blade 12 is configured as a part of the spell blade 11 whose both ends are integrally supported by the outer peripheral shroud 13 and the inner peripheral shroud 14. Accordingly, the vibrations of the plurality of stationary blades 12 can be attenuated collectively, so that the vibration damping structure can be made compact. However, it goes without saying that the present invention can be applied to the stationary blade 12 having a structure in which the stationary blade 12 is not configured as a part of the spelling blade 11.

  In this embodiment, the mesh wire 24 is interposed between the inner peripheral shroud 14 and the seal member 20, but the position of the mesh wire 24 is not limited to this. That is, the mesh wire 24 may be interposed at at least one place between members disposed from the stationary blade 12 to the disk 4. For example, it may be interposed between inner shrouds adjacent to each other as in the second conventional example (structure of FIG. 5), or static as in the third conventional example (structure of FIG. 6). You may interpose between a wing | blade, an inner peripheral shroud, and an outer peripheral shroud.

  In this embodiment, the vibration transmitted from the inner peripheral end of the stationary blade 12 to the disk 4 is attenuated. However, the vibration transmitted from the outer peripheral end of the stationary blade 12 to the cylindrical portion 2a of the casing 2 is attenuated. You may comprise as follows. In this case, the mesh wire 24 is interposed in at least one place between the members arranged from the stationary blade 12 to the cylindrical portion 2a of the casing 2. Moreover, you may comprise so that both the vibration transmitted from the inner peripheral end of the stationary blade 12 and the vibration transmitted from an outer peripheral end may be attenuated.

  In this embodiment, a buffer housing chamber 23 is formed between the inner peripheral shroud 14 and the seal member 20, and a mesh wire 24 is inserted into the buffer housing chamber 23 in a compressed state. Therefore, the mesh wire 24 only needs to be filled in the buffer housing chamber 23, and thus the mesh wire 24 can be easily assembled. In order to change the vibration damping characteristic, for example, the filling amount of the mesh wire 24 may be changed, so that the vibration damping band can be easily changed without replacing the mesh wire 24 in its entirety.

  Here, in the third conventional example (structure of FIG. 6), since the vibration attenuation band depends on the vibration attenuation function of the buffer, a vibration attenuation characteristic with stable vibration characteristics can be obtained. In order to change the band, it is necessary to completely replace the buffer itself. On the other hand, in this embodiment, full replacement is not necessary.

  In this embodiment, the blade whose vibration is to be reduced is the stationary blade 12, but the present invention can be similarly applied to the moving blade 10.

  In this embodiment, the metal fiber buffer is a mesh wire 24 in which a large number of metal fiber wires are gathered together. The mesh wire 24 is entangled with metal fiber wires, and the metal fiber wires reliably generate the relative sliding friction with high frequency inside, so that there is an advantage that the vibration damping effect by the internal sliding friction is great. The metal fiber buffer is not limited to a structure in which a large number of metal fiber wires are entangled with each other like the mesh wire 24, and any metal fiber buffer may be used as long as it has a structure that generates relative sliding friction when transmitting vibrations. .

  Further, since the mesh wire 24 is composed of a large number of metal fiber wires, it can maintain stable physical characteristics even in a high temperature atmosphere. It can be used in a high temperature atmosphere.

  In this embodiment, the blade vibration reduction structure is applied to the compressor 1 of the gas turbine. However, it is needless to say that the structure can be applied to devices other than the gas turbine. Of course, the present invention can be applied to portions other than the compressor 1 of the gas turbine, for example, a fan or a turbine.

It is a front view of the compressor which showed one embodiment of this invention and was seen from the air inflow side. BRIEF DESCRIPTION OF THE DRAWINGS It shows one embodiment of the present invention and is a fragmentary perspective view of a compressor. FIG. 5 is an exploded perspective view for explaining an assembling procedure of the spell wing, the seal member, and the mesh wire according to the embodiment of the present invention. It is sectional drawing of the vibration reduction structure concerning a 1st prior art example. It is a principal part front view of the vibration reduction structure concerning a 2nd prior art example. It is a principal part perspective view of the vibration reduction structure concerning a 3rd prior art example.

Explanation of symbols

1 Compressor 2 Casing (base part)
4 disc (base)
7 Distribution channel (space where fluid flows)
11 Spelling wings 12 Static wings (wings)
14 inner shroud (support)
20 Sealing member (supporting part)
23 Buffer Housing Chamber 24 Mesh Wire (Metal Fiber Buffer)

Claims (5)

A wing disposed in a space in which fluid flows, and a support portion that supports the wing on a base portion,
A blade vibration reducing structure characterized in that a metal fiber buffer composed of an assembly of metal fiber wires is interposed in a compressed state between adjacent members from the blade to the base portion. The vibration reducing structure for a wing according to claim 1,
The wing is configured as a part of a spell wing whose both ends are integrally supported by an outer shroud and an inner shroud,
The support portion is composed of the outer peripheral shroud and the inner peripheral shroud of the spell wing, and a seal member that maintains airtightness between the inner peripheral shroud and the base,
The structure for reducing blade vibration, wherein the metal fiber buffer is interposed between the inner shroud and the seal member. The vibration reducing structure for a wing according to claim 2,
A structure for reducing blade vibration, wherein a buffer housing chamber is formed between the inner shroud and the seal member, and the metal fiber buffer is inserted into the buffer housing chamber in a compressed state. The vibration reducing structure for a wing according to any one of claims 1 to 3,
The wing vibration reducing structure, wherein the wing is a stationary wing. The vibration reducing structure for a wing according to any one of claims 1 to 4,
The structure for reducing vibration of a wing, wherein the metal buffer is a mesh wire in which a large number of metal fiber wires are intertwined.

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