JP3805486B2 - Turbine blade installation method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for mounting a turbine blade.
[0002]
[Prior art]
As a technique for assembling the turbine blade, for example, Japanese Utility Model Laid-Open No. 7-14102 “Mounting structure of moving blade” is proposed, and FIG. 3 shows the turbine.
[0003]
In the following description, a turbine in which a turbine blade is attached to a disk is referred to as a “turbine rotor”.
FIG. 11 is a partial view of a conventional turbine rotor provided with oblique grooves. A certain type of turbine rotor 100 is provided with a plurality of oblique grooves 102 (... indicates a plurality, the same applies hereinafter) on a disk 101. There is a type in which the turbine blades 103 are respectively fitted in the slanted grooves 102 and the tip portions 104 of the turbine blades 103 are connected to each other.
[0004]
FIG. 12 is a view taken in the direction of arrow 12 in FIG. 11 and shows that the oblique grooves 102 are inclined with respect to the axis of the disk 101 and that the front end portions 104 and 104 are latched by unevenness.
[0005]
[Problems to be solved by the invention]
[0006]
In the structure described above, the tip portions 104 must be hooked together and the grooves 102 are slanted, so that assembly is not easy and skill is required.
As the turbine blade mounting structure becomes more complex, it can be said that the improvement of the mounting technology has been slow.
SUMMARY OF THE INVENTION An object of the present invention is to provide a method for easily attaching a turbine blade having a complicated structure even to a general operator.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, claim 1 of the present invention provides a turbine blade mounting method for mounting a plurality of turbine blades radially on a disk.
The disk is loosely fixed to the first pedestal and the tips of the turbine blades are connected to each other for provisional assembly, and the provisionally assembled base of the turbine blade is temporarily fitted into the disk groove. A fitting step, a step of placing these shallowly fitted turbine blades on the second pedestal, and a turbine blade placed on the second pedestal being parallel to the disk placed on the first pedestal. A step of confirming, a step of firmly fixing the disk to the first pedestal when it is confirmed that the two are parallel, and a groove of the disk by pressing the base of the turbine blade while applying vibration to the groove of the fixed disk. characterized in that comprising the present fitting step of Ru is fitted into.
[0008]
Since the temporarily fitted turbine blade is finally fitted while vibrating, the turbine blade can be smoothly attached to the groove of the disk.
Since one turn of the turbine blade is temporarily assembled and temporarily fitted in the temporarily assembled state, the mounting operation can be efficiently performed in a short time compared to the case where the turbine blade is assembled separately.
Therefore, a general worker can attach the turbine blade to the disk without being a skilled worker.
[0009]
According to a second aspect of the present invention, the turbine blade retaining member is attached to the base of the turbine blade prior to the temporary fitting step.
Since the turbine blade retaining member can be attached to the disk simultaneously with the turbine blade, the production efficiency is improved.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a sectional view of a turbine rotor according to the present invention. The turbine rotor 1 includes a disk 2, turbine blades (hereinafter referred to as “blades”) 3, and blade retaining pins 4.
[0011]
FIG. 2 is an exploded perspective view of the turbine rotor according to the present invention.
The disk 2 is formed by engraving disk grooves 5 at equal intervals on the outer periphery.
The blade 3 includes a wing 8, a platform 9 at the base of the wing 8, a tree-like base portion 10 formed below the platform 9, and a shroud 11 at the tip.
[0012]
FIG. 3 is a side view of the blade retaining pin 4 according to the present invention. The blade retaining pin 4 includes a convex portion 4a formed by processing a band plate and folding it in the center, and one of the convex portions 4a. It consists of a bent portion 4c following the straight portion 4b and the other straight portion 4d.
As shown in FIG. 1, the blade retaining pin 4 has a convex portion 4a that hangs on the bottom of the blade 3, a bent portion 4c that hangs on the disc 2 (see FIG. 2), and a straight portion 4d that is bent. 2 to prevent the blade 3 from coming off.
[0013]
4 is a view taken along arrow 4-4 of FIG.
The disk groove 5 is a stepped groove, and the surface passing through the center of this groove passes through the center of the disk 2 and intersects the front surface 6 and the rear surface 7 perpendicularly with respect to the front surface 6. It is engraved diagonally so as to have θ.
[0014]
FIG. 5 is a sectional view of the turbine blade assembling apparatus according to the present invention.
The turbine blade assembling apparatus 20 includes a gantry 21, a mounting plate 22 on the gantry 21, a first pedestal assembly 30, a second pedestal assembly 40, an upper limit positioning mechanism 50, and the mounting plate 22. Each unit will be described in detail below.
[0015]
The first pedestal assembly 30 includes a first pedestal 31, a fixed shaft 32 attached to the upper center of the first pedestal 31, a washer 33 attached to the fixed shaft 32, and a nut 34.
The first pedestal 31 includes an annular receiving surface 31a on the upper surface. 31b is a recess for escape.
[0016]
The pressing means 60 includes a pressing means upper mechanism 61 and a pressing means lower mechanism 70. Hereinafter, the pressing means 60 will be described separately.
The pressing means upper mechanism 61 includes a support base 62, a support plate 63 attached to the upper part of the support base 62, an elevating cylinder 64 attached to the support plate 63, a piston rod 65 of the elevating cylinder 64, and the piston rod. A joint 66 attached to the tip of 65, a pedestal 67 attached to the joint 66, and guides 68 and 68 for guiding the raising and lowering of the pedestal 67 are included.
[0017]
FIG. 6 is a detailed view of the lower mechanism of the pressing means according to the present invention. The lower mechanism 70 of the pressing means includes a pressing shaft 72 attached to the lower portion of the pedestal 67 with bolts 71 and bearings 73, 73 on the pressing shaft 72. The pressure table 74 is attached to the pressure table 74, the vibration generator 75 is mounted on the pressure table 74, and the pressure plate 76 is attached to the lower part of the pressure table 74.
Since the pressing stand 74 is attached to the pressing shaft 72 via the bearings 73, 73, it can rotate around the pressing shaft 72.
[0018]
Reference numeral 77 denotes a detent block, 78 is a detent plate, and 79 is a tension spring connecting the receiving table 67 and the pressing table 74.
The anti-rotation block 77 and the anti-rotation plate 78 prevent the pressing stand 74 from rotating clockwise.
That is, the anti-rotation block 77 and the anti-rotation plate 78 are formed obliquely so that the disk grooves 5 formed on the outer periphery of the disk 2 have an angle θ counterclockwise from the front surface 6 to the rear surface 7 of the disk 2 as shown in FIG. Therefore, the pressing table 74 can be rotated 360 degrees in the formation direction of the disk grooves 5 and cannot be rotated in the opposite direction.
The tension spring 79 is used to return the rotated pressing table 74 to its original position when the pressing table 74 has been pressed and the pressing table 74 is pulled up.
[0019]
FIG. 7 is a sectional view of the second pedestal and the upper limit positioning mechanism according to the present invention.
The second pedestal assembly 40 includes a second pedestal 41, a pedestal receiving base 42 that receives the second pedestal 41, and a compression spring 43 as a resilient member that presses the pedestal receiving base 42 upward. , A guide bar 44 including a pedestal receiving base 42 and a compression spring 43; a retaining ring 45 and nuts 46 and 46 provided on the upper portion of the guide bar 44; and a spacer that communicates between the pedestal receiving base 42 and the upper limit positioning mechanism 50. 47.
The second pedestal 41 has a cylindrical shape that surrounds the outer periphery of the first pedestal 31 and leaves the bottom around the bottom, and 41 a is the upper surface of the second pedestal 41.
[0020]
The upper surface 41a of the second pedestal is for placing the blades 3 for one round.
The pedestal receiving stand 42 is an annular one provided on the outer periphery of the second pedestal 41 with the lower part of the second pedestal 41 placed thereon.
The second pedestal 41 has a pedestal receiving base 42 that supports the lower portion of the second pedestal 41 guided by the guide bars 44 and supported by the compression springs 43. The pedestal 31 is movable downward while maintaining parallel to the annular edge 31a on the upper surface.
[0021]
The upper limit positioning mechanism 50 is screwed into the positioning plate 51, the cylinder 52 that moves the positioning plate 51 up and down, the stopper bolts 53 and 54 that stand on both sides of the cylinder 52, and the upper portions of the stopper bolts 53 and 54. It consists of nuts 55, 55, 56 and 56.
The upper limit positioning mechanism 50 regulates the position of the upper surface 41a of the second pedestal 41. When the position of the positioning plate 51 is determined, the position of the pedestal receiving base 42 is determined via the spacer 47. The position of the upper surface 41 a of the second pedestal 41 is determined by determining the position of the cradle 42. The position of the positioning plate 51 is the upper limit position where the stroke of the cylinder 52 that moves the positioning plate 51 up and down is maximized, and the position corresponding to the uppermost surface of the nuts 55, 55, 56, 56 is the lower limit position.
[0022]
Next, a method for attaching the turbine blade using the turbine blade assembling apparatus described above will be described.
FIG. 8 is a first explanatory view of the turbine blade mounting method according to the present invention.
The disk 2 is fitted to the fixed shaft 32, the outer periphery of the disk 2 is placed on the annular receiving surface 31 a of the first base 31 as indicated by the arrow (1), and the nut 34 is attached to the fixed shaft 32 via the washer 33. The disc 2 is loosely fixed to the first pedestal 31 by being temporarily tightened by being screwed into the tip end portion.
[0023]
On the other hand, the blades 3... Are temporarily assembled, and the shrouds 11 at the tips of the blades 3... For one round are connected to each other so that only the blades 3. The process of temporarily assembling is an easy operation of only connecting the shrouds 11 at the tips of the blades 3.
Next, as shown by arrow (2), a temporary fitting process is performed in which the base 10 of the blade 3 of the blade temporary assembly 12 is shallowly fitted into the disk groove 5. 12 is placed on the second pedestal 41.
Since one round of the blades 3 is temporarily assembled and temporarily fitted in the temporarily assembled state, the mounting operation can be efficiently performed in a short time compared to the case where the blades 3 are assembled separately.
[0024]
FIG. 9 is a second explanatory view of the method for attaching the turbine blade according to the present invention, and shows a state on the turbine blade assembling apparatus 20 after the temporary fitting process of the disk 2 and the temporary blade assembly 12.
In the figure, δ is a temporary fitting depth, which is a distance between the upper surface 2a of the disk 2 and the lower surface of the base 10 of the blade 3 of the temporary blade assembly 12.
When the thickness of the disk groove 5 and the base 10 is W, the base 10 of the blade 3 of the temporary blade assembly 12 is temporarily placed on the second pedestal 41 at a position higher than the disk 2 by (W−δ). become.
[0025]
Prior to this temporary fitting step, blade retaining pins 4 are attached to the bases 10 as shown in FIG. Since the blade retaining pins 4 can be attached to the disk 2 at the same time as the blades 3, the production efficiency is increased.
By placing the temporary blade assembly 12 on the second pedestal 41 at the time of temporary fitting, it can be confirmed that the temporary blade assembly 12 has been temporarily fitted in parallel to the disk 2 placed on the first pedestal 31.
After the temporary fitting, the nut 34 at the tip of the fixed shaft 32 is firmly tightened, and the disc 2 is fixed to the first base 31.
[0026]
FIG. 10 is a third explanatory view of the turbine blade mounting method according to the present invention. According to this figure, the main fitting fitted into the disk grooves 5... By pressing the blades 3. The combined process will be described.
In this fitting process, the tip of the presser 76 is applied to the base 10... Of the blade 3 of the temporary blade assembly 12, and the lift cylinder 64 (see FIG. 6) while applying vibration to the presser 76 by the vibration generator 75 (see FIG. 6). 5), the presser plate 76 is pushed down to fit the bases 10... Into the disk grooves 5.
Since the temporarily fitted blades 3... Are vibrated while being vibrated, the blades 3 can be smoothly attached to the disk grooves 5.
[0027]
By pressing the base 10 of the blade 3 of the temporary blade assembly 12 mounted on the second pedestal 41, the temporary blade assembly 12 descends while maintaining parallel to the disk 2 mounted on the first pedestal 31. Therefore, there is no possibility that the base portions 10 of the blades 3 are uniformly fitted into the disk grooves 5 and hit each other and cannot be fitted.
[0028]
Since the pressing table 74 can rotate around the pressing shaft 72 as shown in FIG. 6 during this fitting process, the pressing plate 76 attached to the pressing table 74 is the base of the blade 3 formed obliquely of the temporary blade assembly 12. 10... Rotate while fitting slightly while rotating along the disk grooves 5... Obliquely engraved on the outer periphery of the disk 2. By rotating the presser 76, the base portions 10 of the blade 3 can be fitted into the disk grooves 5 without difficulty.
[0029]
When this fitting process is completed, the cylinder 52 of the upper limit positioning mechanism 50 is operated, the positioning plate 51 is lowered until it comes into contact with the upper surfaces of the nuts 54, 54, 55, and 55, and the upper surface of the spacer 47 is pressed. By pressing the upper surface of the spacer 47, the pedestal receiving base 42 and the second pedestal 41 supported by the compression spring 43 do not rise even when the presser 76 is raised.
Since the second pedestal 41 does not rise, it is possible to efficiently perform the work of removing the turbine rotor 1 that has completed the subsequent assembly of the blades 3 to the disk 2 from the turbine blade assembly apparatus 20.
[0030]
Thereafter, the elevating cylinder 64 (see FIG. 5) is operated to raise the presser 76 to the standby position, and the blades 3... And the disk 2 assembled together are removed.
Finally, by extending the stroke of the cylinder 52 of the upper limit positioning mechanism 50 to the maximum, the second pedestal 41 is raised and returned to the initial position.
Since the initial position of the second pedestal 41 is constant, the optimum temporary fitting depth δ can be maintained, and the subsequent temporary fitting process can be performed efficiently.
[0031]
As described above, since the operations in each process are easy, the general worker can attach the turbine blades 3 to the disk 2 even if they are not skilled workers.
[0032]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
The method for attaching the turbine blade according to claim 1 includes a step of loosely fixing the disk to the first pedestal and connecting the tips of the turbine blades to temporarily assemble them for one round, and the turbine blade in a temporarily assembled state. A temporary fitting step of fitting the base portion shallowly into the groove of the disk, a step of placing these shallowly fitted turbine blades on the second pedestal, and a turbine blade placed on the second pedestal are the first A step of confirming that the disk is parallel to the disk placed on the pedestal; a step of firmly fixing the disk to the first pedestal if it is confirmed to be parallel; and a base of the turbine blade in the groove of the fixed disk consists of a book fitting step of Ru is fitted into the groove of the disk by pressing while applying vibration to, after the turbine blade was confirmed to be parallel to the disk By the base of the over bottle blades so as to present fit while vibrating, because the base of each turbine blade uniformly fitted to the disk groove, can be fitted, it is attached smoothly turbine blade in the groove of the disc In addition, by temporarily assembling one turn of the turbine blade and temporarily fitting it in the temporarily assembled state, it is possible to perform the installation work in a short time and efficiently compared to the case where the turbine blade is assembled separately. .
Therefore, even a non-skilled worker can perform a general worker.
[0033]
In the turbine blade mounting method according to the second aspect, the turbine blade retaining member is attached to the base of the turbine blade prior to the temporary fitting step. Therefore, the turbine blade retaining member is also attached to the disk simultaneously with the turbine blade. It can be installed and the production efficiency goes up.
[Brief description of the drawings]
1 is a cross-sectional view of a turbine rotor according to the present invention. FIG. 2 is an exploded perspective view of a turbine rotor according to the present invention. FIG. 3 is a side view of a blade retaining member according to the present invention. FIG. 5 is a cross-sectional view of the turbine blade assembling apparatus according to the present invention. FIG. 6 is a detailed view of the lower mechanism of the pressing means according to the present invention. FIG. 8 is a first explanatory view of a turbine blade mounting method according to the present invention. FIG. 9 is a second explanatory view of a turbine blade mounting method according to the present invention. FIG. 11 is a partial view of a conventional turbine rotor provided with oblique grooves. FIG. 12 is a view taken along the arrow 12 in FIG.
DESCRIPTION OF SYMBOLS 1 ... Turbine rotor, 2 ... Disc, 3 ... Turbine blade, 4 ... Blade retaining member, 5 ... Disc groove, 11 ... Turbine blade tip (shroud), 10 ... Base of turbine blade, 12 ... Temporarily The assembled turbine blade (blade temporary assembly), 20 ... turbine blade assembly device, 75 ... vibration generator.

Claims (2)

In the turbine blade mounting method of mounting a plurality of turbine blades radially on a disk,
The disk is loosely fixed to the first pedestal and the tips of the turbine blades are connected to each other to temporarily assemble one turn, and the base of the temporarily assembled turbine blade is shallowly fitted into the groove of the disk. A temporary fitting step of combining the turbine blades, a step of placing the shallowly fitted turbine blades on the second pedestal, and a turbine blade placed on the second pedestal parallel to the disk placed on the first pedestal. A step of confirming that there is a step, a step of firmly fixing the disk to the first pedestal if it is confirmed that the two are parallel, and pressing the base of the turbine blade against the groove of the fixed disk while applying vibration. the method of assembling a turbine blade characterized by comprising the present fitting step of Ru is fitted into the groove of the disc.   2. The turbine blade assembling method according to claim 1, wherein a turbine blade retaining member is attached to a base portion of the turbine blade prior to the temporary fitting step.

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