KR20180121432A - Rotating parts, method of manufacturing the same and steam turbine including the same - Google Patents

Abstract

The present invention relates to rotating parts, a method of manufacturing the same, and a steam turbine including the same, wherein the rotating parts comprise: a rotor provided to rotate; and an n-number of buckets coupled to the rotor to convert energy that steam sprayed from a nozzle has to mechanical work. The n-number of buckets are coupled to the rotor with a tangential entry method, and all the n-number of buckets are formed to be supported by the rotor. Therefore, the buckets can be stably coupled to the rotor.

Description

Technical Field [0001] The present invention relates to a rotating body, a rotating body manufacturing method for manufacturing the same, and a steam turbine including the same. BACKGROUND OF THE INVENTION 1. Field of the Invention [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating body, a method of manufacturing a rotating body for manufacturing the same, and a steam turbine including the same, and more particularly, to a so-called tangential entry method in which a bucket is inserted along the circumferential direction of the rotor The present invention relates to a rotating body for stably fastening a bucket to a rotor when fastened to a rotor, a rotating body manufacturing method for manufacturing the same, and a steam turbine including the same.

Generally, a turbine is a machine that converts the energy of a fluid such as water, gas, or steam into mechanical work. It is a turbo type machine that usually plantes several feathers or wings on the circumference of a rotating body, Is called a turbine.

Examples of such turbines include a hydraulic turbine that utilizes the energy of high water, a steam turbine that utilizes the energy of the steam, a gas turbine that uses the energy of the high-temperature and high-pressure gas, and a high- Air turbines, and the like.

Among them, the steam turbine is formed so as to convert the energy of the steam into mechanical work by causing steam to be blown from the nozzle and striking the collar to rotate the rotating body.

Specifically, the steam turbine includes a casing forming an outer shape and a skeleton of the turbine, a rotating body rotatably installed in the casing, and a nozzle injecting steam into the rotating body.

Korean Patent Publication No. 10-1376716 discloses a conventional rotating body and a steam turbine including the same.

Korean Patent Publication No. 10-1376716 discloses that a conventional rotating body is fastened to the rotor so as to convert the energy possessed by the steam injected from a rotor and a nozzle (not shown) And n buckets 10, 11, and 12, respectively.

Here, the n buckets 10, 11 and 12 are fastened to the rotor 1 in a so-called tangential entry manner.

Specifically, the rotor is formed in a disk shape, and a tangential entry 4 is formed at one side of the outer periphery of the rotor to serve as an entrance and exit of the bucket, and the bucket 10, 11 is supported on the other side of the outer periphery of the rotor Circumferential direction dovetail projections 3 extending from the tangential entry 4 along the circumferential direction of the rotor. Here, the circumferential dovetail projections 3 are disconnected by the tangential entry 4.

The n buckets (10, 11, 12) each have a root portion having circumferential dovetail grooves (10a, 11a, 12a) engageable with the circumferential dovetail projections (3) As shown in Fig.

On the other hand, the n-th bucket 12 as a final bucket closest to the circumferential direction dovetail projections 3 is only supported by the separate pin 13 because it is only inserted into the tangential entry 4 . Specifically, on one side of the root portion of the n-th bucket 12 in the circumferential direction of the rotor, a first pin 13, which is a first pin hole in which a first pin 13 is inserted together with a third groove 10b And a groove 12b is formed on the other side of the root portion of the n-th bucket 12. A second groove 13b is formed in the second groove 13b, 12c are formed. A third groove 10b forming a first pin hole is formed in the root of the first bucket 10 adjacent to the n-th bucket 12 together with the first groove 12c. In the root portion of the (n-1) th bucket 11 adjacent to the n-th bucket 12 on the opposite side of the first bucket 10 with respect to the n-th bucket 12, And a fourth groove 11b constituting a second pinhole are formed. According to this configuration, the n-th bucket 12 is supported by the first bucket 10 via the first pin 13 and the first pin hole so that one side of the n-th bucket 12 is supported by the first bucket 10, The other side of the n-th bucket 12 is supported by the n-1-th bucket 11 through the second pin 13 and the second pin hole.

The conventional rotating body according to this configuration is manufactured as follows.

That is, the first to n-1th buckets 10, 11 are connected to the rotor 10 through the circumferential dovetail grooves 10a, 11a of each bucket, the tangential entry 4 and the circumferential dovetail projections 3, And is assembled sequentially with the rotor by being inserted in the circumferential direction of the rotor.

Then, the n-th bucket 12, which is the final bucket closer, is inserted into the tangential entry 4.

Then, the first pin (13) is inserted into the first pin hole, and the second pin (13) is inserted into the second pin hole.

However, in the conventional rotary body, the rotary body manufacturing method for manufacturing the rotary body, and the steam turbine including the rotary body, there is a problem that the bucket can not be stably fixed to the rotor. That is, the n-th bucket 12 is not supported by the circumferential dovetail projections 3, but is supported by the first bucket 10 and the n-1-th bucket 11, 1 and the rotor-to-rotor-to-rotor-to-rotor-to-rotor-to-rotor-to-rotor-to-rotor-to-rotor-to-rotor-to-rotor-to-rotor-to- In addition, a considerable load is applied to the first pin 13, the first pin hole, the second pin 13, and the second pin hole, and damage is generated, and the bucket is detached from the rotor . The n-th bucket 12 is moved in the axial direction of the rotor and is disengaged from the rotor. During operation, the n buckets (10, 11, 12) are relatively rotated with respect to the rotor along the circumferential direction of the rotor, so that the energy of the steam can not be converted into mechanical integrity, there was.

Korean Patent Publication No. 10-1376716

Accordingly, it is an object of the present invention to provide a rotating body in which a bucket can be stably fixed to a rotor, a rotating body manufacturing method for manufacturing the same, and a steam turbine including the same.

In order to achieve the above-mentioned object, the present invention is characterized by comprising: a rotor rotatably installed; And n buckets fastened to the rotor to convert the energy of the steam injected from the nozzles into mechanical work, wherein the n buckets are fastened to the rotor in a tangential entry manner And all of the n buckets are supported by the rotor.

Wherein the tangential entry of the rotor is such that the n buckets are generally moved along the circumferential direction of the rotor such that a portion of the tangential entry is offset from a portion of one of the n buckets and a portion of the bucket in the axial and radial directions And the remainder of the tangential entry may overlap in an axial and radial direction of the rotor with a portion of the bucket adjacent to the one bucket.

The rotor comprising: a rotor wheel having the tangential entry; And a converter for filling the tangential entry.

The converter may be formed to be moved along the axial direction of the rotor and coupled with the rotor wheel.

Wherein the rotor wheel includes an axial dovetail groove recessed radially inwardly of the rotor from the tangential entry and extending along an axial direction of the rotor, the converter including an axial dovetail And may include protrusions.

Wherein the rotor wheel includes a first circumferential dovetail projection extending circumferentially of the rotor from the tangential entry and disconnected by the tangential entry, the converter including a first circumferential dovetail protrusion that fills the disconnected portion of the first circumferential dovetail projection And may include a second circumferential dovetail projection.

The first circumferential dovetail projections and the second circumferential dovetail projections may form one annular dovetail projections.

The second circumferential dovetail projections may be configured to support at least one of the n buckets.

Each bucket comprising: a root portion having a circumferential dovetail groove engaging a portion of the one annular dovetail projection; And a wing portion protruding from the root portion in the radial direction of rotation of the rotor.

The length of the tangential entry, the length of the second circumferential dovetail projection, the length of the root portion, and the length of the circumferential dovetail groove may all be the same in the circumferential direction of the rotor.

The first to n-l < th > buckets are inserted in the circumferential direction of the rotor through the circumferential dovetail grooves of each bucket, the tangential entry of the rotor wheel and the first circumferential dovetail projections of the rotor wheel, And wherein a n-th bucket is assembled with the converter through the circumferential dovetail grooves of the n-th bucket and the second circumferential dovetail projections of the converter, and the converter assembled with the n-th bucket is inserted into the tangential entry The buckets are assembled with the rotor wheel assembled with the first bucket to the (n-1) -th bucket by being inserted in the axial direction of the rotor, and the first bucket to the (n-1) th bucket assembled to the rotor wheel, The n-th bucket is moved overall to a predetermined position along the circumferential direction of the rotor, and the first circumferential dovetail projections and the second circumferential dovetail projections Wherein said first circumferential dovetail projections and said second circumferential dovetail projections overlap each other in the axial and radial directions of said n-1 < th > bucket and said rotor, In the axial direction and in the radial direction.

The length of the root portion in the circumferential direction of the rotor is referred to as one pitch and the predetermined position is defined by the first bucket to the (n-1) th bucket assembled to the rotor wheel, The n-bucket may be a position that is moved along the circumferential direction of the rotor as a whole by half pitch.

And fixing means for fixing the first to n < th > buckets to the predetermined positions.

The fixing means may include a first pin hole formed in the first circumferential dovetail projection or the second circumferential dovetail projection; A second pin hole formed in the bucket and opposed to the first pin hole when the first bucket to the nth bucket is located at the predetermined position; And a pin inserted into the first pin hole and the second pin hole.

Wherein the first pin hole is formed through the second circumferential dovetail projection along the axial direction of the rotor at the circumferential center side of the second circumferential dovetail projection and the second pin hole is formed through the n-1 And between the root portion of the n-th bucket and the root portion of the n-th bucket along the axial direction of the rotor between the root portion of the n-th bucket and the root portion of the n-th bucket.

The present invention also provides a method of manufacturing a rotor, comprising: a first step including the rotor and the n buckets; Wherein said rotor comprises a rotor wheel having said tangential entry and a converter for filling said tangential entry and wherein said first to n-1 < th > buckets are sequentially arranged in the circumferential direction of said rotor through a tangential entry of said rotor wheel A second step of assembling with the rotor wheel by insertion; A third step of assembling the n-th bucket with the converter; A fourth step of inserting the converter assembled with the n-th bucket into the tangential entry in the axial direction of the rotor to assemble the rotor with the rotor wheel assembled with the first bucket to the (n-1) th bucket; A fifth step of moving the first to n-1th buckets assembled to the rotor wheel and the n-th bucket assembled to the converter by a half pitch as a whole along the circumferential direction of the rotor; And a sixth step of inserting the pin into the first pin hole formed in the rotor and the second pin hole formed in the bucket to fix the n buckets.

According to another aspect of the present invention, The rotating body being rotatably installed in the casing; And a nozzle for spraying steam to the rotating body.

The present invention relates to a rotating body, a method of manufacturing a rotating body for manufacturing the same, and a steam turbine including the rotor, comprising: a rotor rotatably installed; And n buckets fastened to the rotor to convert the energy of the steam injected from the nozzles into mechanical work, wherein the n buckets are fastened to the rotor in a tangential entry manner , And all of the n buckets may be formed to be supported by the rotor. Thereby, the bucket can be stably fastened to the rotor.

1 is a front view showing a rotating body and a steam turbine including the rotating body according to an embodiment of the present invention;
Fig. 2 is a flowchart showing a rotating body manufacturing method for manufacturing the rotating body of Fig. 1,
FIG. 3 is a perspective view showing a second step in the method of manufacturing the rotating body of FIG. 2,
4 is a perspective view showing a third step in the rotating body manufacturing method of FIG. 2,
5 is a perspective view showing a fourth step in the rotating body manufacturing method of FIG. 2,
FIG. 6 is a front view showing a fifth step in the method of manufacturing the rotating body of FIG. 2;
FIG. 7 is a perspective view illustrating a sixth step in the method of manufacturing the rotating body of FIG. 2;
FIG. 8 is a perspective view showing the rotating body manufactured by the rotating body manufacturing method of FIG. 2. FIG.

Hereinafter, a rotating body according to the present invention, a rotating body manufacturing method for manufacturing the same, and a steam turbine including the rotating body will be described in detail with reference to the accompanying drawings.

FIG. 1 is a front view showing a rotating body and a steam turbine including the rotating body according to an embodiment of the present invention, FIG. 2 is a flowchart showing a rotating body manufacturing method for manufacturing the rotating body of FIG. 1, FIG. 4 is a perspective view showing a third step in the method of manufacturing the rotating body of FIG. 2, and FIG. 5 is a perspective view of the fourth embodiment of the rotating body manufacturing method of FIG. FIG. 6 is a front view showing the fifth step in the rotating body manufacturing method of FIG. 2, FIG. 7 is a perspective view showing the sixth step of the rotating body manufacturing method of FIG. 2, 2 is a perspective view showing a rotating body manufactured by the rotating body manufacturing method of Fig. 2; Fig.

1 to 8, a steam turbine according to an embodiment of the present invention includes a casing 100 forming an outer shape and a skeleton of a turbine, a rotor 100 rotatably installed in the casing 100, And a nozzle (not shown) for spraying steam to the rotors 300 and 400 and the rotors 300 and 400, respectively.

The rotors 300 and 400 are coupled to the rotor 300 so as to convert the energy of vapors injected from the rotors 300 and nozzles (not shown) And n buckets 400, as shown in FIG.

The n buckets 400 are coupled to the rotor 300 in a so-called tangential entry manner, and all of the n buckets 400 may be supported by the rotor 300.

Specifically, the rotor 300 includes a rotor wheel 310 having a tangential entry 312 serving as an entrance and exit of the bucket 400, and a converter 320 filling the tangential entry 312, The rotor wheel 310 and the converter 320, which are fastened to each other, may be formed in a disc shape as a whole.

The rotor wheel 310 includes the tangential entry 312 formed in a slot shape on one side of the outer periphery of the rotor wheel 310 and the tangential entry 312 extending in the circumferential direction of the rotor 300 from the tangential entry 312 A first circumferential dovetail projection 314 cut off by the tangential entry 312 and an axial direction of the rotor 300 engraved from the tangential entry 312 radially inward of the rotor 300 And an axial dovetail groove 316 extending along the axial direction.

The tangential entry 312 is a portion of the bucket 400 as an entrance and exit of the bucket 400 so that the bucket 400 is inserted and coupled along the circumferential direction of the rotor 300 as described above, The circumferential length of the tangential entry 312 may be formed at a level equivalent to the circumferential length of the root portion 410 so that the portion 410 can be taken in and out of the tangential entry 312. [ Here, the circumferential direction means the circumferential direction of the rotor 300.

Here, the tangential entry 312 may be formed to have a size such that a plurality of buckets 400 can simultaneously enter and exit the tangential entry 312. However, the tangential entry 312 may be formed by the tangential entry 312, It may be preferable that one bucket 400 is formed at a size such that the buckets 400 can be moved into and out of the tangential entry 312 at the same time in order to minimize the increase of the cut-off portions of the protrusions 314.

The first circumferential dovetail projections 314 may form one annular dovetail projections R formed on the outer circumferential portion of the rotor 300 together with a second circumferential dovetail projections 324 to be described later. The one annular dovetail projections R together with the circumferential dovetail grooves 412 to be described later are formed in the n buckets 400 when the n buckets 400 are moved along the circumferential direction of the rotor 300 As well as to prevent the n buckets 400 from deviating from the rotor 300 in the axial and radial directions of the rotor 300 and to support the n buckets 400 Can play a role.

The first circumferential direction dovetail projections 314 are formed in the circumferential direction of the rotor 300 so that the bucket 400 inserted through the tangential entry 312 can move along the circumferential direction of the rotor 300. [ A section perpendicular to the circumferential direction can be formed constantly.

The first circumferential dovetail projections 314 are formed such that the bucket 400 fastened to the first circumferential dovetail projections 314 is spaced from the first circumferential dovetail projections 314 by the radius of the rotor 300 At least one raised portion raised in the axial direction of the rotor 300 and at least one settled portion precipitated in the axial direction of the rotor 300 may be included to prevent the rotor 300 from being detached from the rotor 300. [

The axial dovetail grooves 316 together with the axial dovetail projections 326 to be described later move the converter 320 along the axial direction of the rotor 300 to be fastened to the rotor wheel 310 The converter 320 may be formed to prevent the converter 320 from separating from the rotor wheel 310 in the circumferential and radial directions of the rotor 300 and to support the converter 320.

That is, the axial dovetail groove 316 is formed so that the axial dovetail projections 326 of the converter 320 inserted in the axial dovetail grooves 316 move along the axial direction of the rotor 300 A section perpendicular to the axial direction of the rotor 300 may be constantly formed.

The axial direction dovetail groove 316 is formed such that the converter 320 coupled to the axial direction dovetail groove 316 is separated from the axial direction dovetail groove 316 in the radial direction of the rotor 300 At least one raised portion in the circumferential direction of the rotor 300 and at least one set of circumferentially precipitated portions of the rotor 300 may be included.

The converter 320 includes a second circumferential dovetail projection 324 that fills the tangential entry 312 as well as filling the cutaway portion of the first circumferential dovetail projection 314, And an axial dovetail projection 326 which is engaged with the axial dovetail projection 326.

The second circumferential dovetail projections 324 may be formed to form the annular dovetail projections R together with the first circumferential dovetail projections 314 as described above.

That is, the second circumferential direction dovetail projections 324 are formed such that the cross section perpendicular to the circumferential direction of the rotor 300 is formed to be constant so that the bucket 400 can move along the circumferential direction of the rotor 300 .

The second circumferential direction dovetail projections 324 are formed such that the bucket 400 fastened to the second circumferential direction dovetail projections 324 is spaced from the second circumferential direction dovetail projections 324 by the radius of the rotor 300 At least one raised portion raised in the axial direction of the rotor 300 and at least one settled portion precipitated in the axial direction of the rotor 300 may be included to prevent the rotor 300 from being detached from the rotor 300. [

Here, the second circumferential direction dovetail projections 324 may include at least one raised portion and at least one settling portion like the first dovetail projections to support at least one bucket 400 of the n buckets 400 . That is, the second circumferential direction dovetail projections 324 may be formed in a part of the n-1 bucket 400n-1 and the n-th bucket 400n-1 when the n buckets 400 are half- 400n of the n buckets 400 and may support one of the n buckets 400 when the n buckets 400 are not moved by half pitch as a whole .

Meanwhile, the second circumferential direction dovetail projections 324 may be formed to have a size capable of filling the tangential entry 312. That is, the circumferential length of the second circumferential dovetail projections 324 may be equal to the circumferential length of the tangential entry 312.

The axial dovetail projections 326 are formed to have a constant cross section perpendicular to the axial direction of the rotor 300 so as to be engaged with the axial dovetail grooves 316, At least one raised portion and at least one set of circumferentially precipitated portions of the rotor (300).

Each of the n buckets 400 includes a root portion 410 coupled to the rotor 300 and a wing portion 420 projecting from the root portion 410 in the radial direction of rotation of the rotor 300 .

The root portion 410 includes a circumferential dovetail groove 412 that engages with a portion of the one annular dovetail projection R and a platform 414 that defines the appearance of the circumferential dovetail groove 412 .

The circumferential directional dovetail groove 412 has a section perpendicular to the circumferential direction of the rotor 300 so as to be able to engage with the one annular dovetail projection R, And at least one settling portion axially settled on the rotor (300).

The circumferential direction dovetail groove 412 may be formed so that the circumferential length of the circumferential dovetail groove 412 is equal to the circumferential length of the root portion 410.

The converter 300 and the bucket 400 supported by the converter 320 are moved along the axial direction of the rotor 300 to rotate the rotor wheel 300 310 and the buckets 400 supported by the rotor wheel 310. In order to prevent the deterioration of the rotating bodies 300 and 400,

That is, the rotors 300 and 400 include a first stage S1 including the rotor 300 and the n buckets 400, a first stage S1 to a first bucket 4001 to an (n-1) th bucket 400n- A third step S3 of assembling the n-th bucket 400n with the converter 320, a third step S3 of assembling the n-th bucket 400n with the rotor wheel 310, (S4) of assembling the bucket (400) with the rotor (310), and a fifth step (S5) of moving the n buckets (400) along the circumferential direction of the rotor (300) as a whole.

More specifically, the bucket 400 finally assembled among the n buckets 400 is referred to as an n-th bucket 400n, and the bucket 400 adjacent to the n-th bucket 400n is referred to as a first bucket 4001 And from the first bucket 4001 to the nth bucket 400n are sequentially referred to as a second bucket 4002 to an (n-1) th bucket 400n-1 along the circumferential direction of the rotor 300 , The first bucket 4001 to the (n-1) -th bucket 400n-1 are connected to the tangential entry 312, the first It can be sequentially assembled with the rotor wheel 310 by being inserted in the circumferential direction of the rotor 300 through the circumferential dovetail projections 314 and the circumferential dovetail grooves 412. [

Then, through the third step S3, the n-th bucket 400n is moved in the circumferential direction dovetail grooves 412 of the n-th bucket 400n and the second circumferential dovetail projections 412 of the converter 320 324, respectively.

The converter 320 assembled with the nth bucket 400n is inserted into the tangential entry 312 in the axial direction of the rotor 300 through the fourth step S4, May be assembled with the rotor wheel 310 assembled with the bucket 4001 to the (n-1) th bucket 400n-1. That is, the axial dovetail projections 326 are inserted into the axial dovetail grooves 316 and the second circumferential dovetail projections 324 are inserted into the tangential entries 312 to form the first circumferential dovetail The one circular annular dovetail projection R is formed with the protrusion 314 and the n-th bucket 400n is engaged with the second circumferential dovetail projection 324, And may be interposed between the (n-1) -th bucket 400n-1.

The first bucket 4001 to the (n-1) -th bucket 400n-1 assembled to the rotor wheel 310 and the second bucket 400n-1 assembled to the converter 320 are assembled through the fifth step S5. The n-th bucket 400n can be moved as a whole along the circumferential direction of the rotor 300 to a predetermined position.

Wherein the predetermined position is such that a contact portion between the first circumferential dovetail projections 314 and the second circumferential dovetail projections 324 is in contact with any one of the n buckets 400, And another contact portion between the first circumferential dovetail projections 314 and the second circumferential dovetail projections 324 overlap with each other in the axial direction and the radial direction of the rotor 300 of the root portion 410 And may be a position to cause axial and radial overlapping of the rotor 300 with the root portion 410 of the bucket 400 adjacent to one bucket 400.

That is, if the length of the root portion 410 in the circumferential direction is one pitch, as in the present embodiment, the predetermined position is the first bucket 4001 assembled to the rotor wheel 310, And the n-th bucket 400n assembled to the converter 320 are moved along the circumferential direction of the rotor 300 by a half pitch as a whole, A contact portion between the first circumferential direction dovetail projection 314 and the second circumferential direction dovetail projection 324 contacts the center side of the n-1th bucket 400n-1 and the axial direction of the rotor 300 and the radius And another contact portion between the first circumferential dovetail projections 314 and the second circumferential dovetail projections 324 overlaps the center side of the n-th bucket 400n and the axial direction of the rotor 300 And radially overlapping positions.

Even if the n buckets 400 are located at the predetermined positions by forming the rotors 300 and 400 through the first step S1 through the fifth step S5, The n buckets 400 can be moved in the circumferential direction of the rotor 300 through the operation or the like to depart from the predetermined position. That is, contact portions between the first circumferential dovetail projections 314 and the second circumferential dovetail projections 324 are formed on the side surfaces of the root portions 410 of one of the n buckets 400 In the axial direction and in the radial direction of the rotor 300. The bucket 400 supported by the converter 320 and the converter 320 is moved in the axial direction of the rotor 300 to rotate the rotor wheel 310 and the rotor wheel 310, (400). ≪ / RTI >

In consideration of this, the rotating bodies 300 and 400 according to the present embodiment may further include fixing means for fixing the n buckets 400 at the predetermined positions.

Specifically, the fixing means includes a first pin hole H1 formed in the second circumferential direction dovetail projection 324, a root portion 410 of the n-1th bucket 400n-1, A second pin hole H2 formed between the root portions 410 of the bucket 400n and a pin P inserted into the first pin hole H1 and the second pin hole H2. have.

The first pin hole H1 is formed through the second circumferential dovetail projections 324 along the axial direction of the rotor 300 at the circumferential center side of the second circumferential dovetail projections 324 .

The second pinhole H2 is formed between the root portion 410 of the n-1th bucket 400n-1 and the root portion 410 of the nth bucket 400n in the axial direction of the rotor 300 1 through the root portion 410 of the n-th bucket 400n-1 and the root portion 410 of the n-th bucket 400n. That is, the groove formed to be engraved in the n-1th bucket 400n-1 may form the second pin hole H2 together with a groove formed in the n-th bucket 400n.

The pin P is prevented from being separated from the first pin hole H1 and the second pin hole H2 along the axial direction of the rotor 300, Can be press-fitted into at least one of the two pin holes (H2).

The manufacturing method of the rotating bodies 300 and 400 according to the present embodiment is characterized in that after the fifth step S5 the pin P is inserted into the first pin hole H1 and the second pin hole H2 (S6) of fixing the n buckets (400) by inserting the buckets (400) into the bucket (400).

That is, the rotating bodies 300 and 400 according to the present embodiment are configured such that when the n buckets 400 are positioned at the predetermined positions through the fifth step S5, the first pin holes H1, And the second pin hole H2 are opposed to each other and the pin P is inserted into the first pin hole H1 and the second pin hole H2 through the sixth step S6, n buckets 400 may be secured in the predetermined position.

Hereinafter, effects of the rotating body according to the present embodiment, the rotating body manufacturing method for manufacturing the same, and the steam turbine including the rotating body will be described.

That is, the steam injected from the nozzle (not shown) flows into the n buckets 400 along the axial direction of the rotor 300, and the steam introduced into the bucket 400 is discharged by the bucket 400 The flow direction can be turned and passed through the bucket 400.

At this time, the bucket 400 may be acted on by the steam, so that the bucket 400 is rotated together with the rotor 300 in the circumferential direction of the rotor 300, Energy can be converted into mechanical energy.

Here, the rotating body according to the present embodiment, the rotating body manufacturing method for manufacturing the same, and the steam turbine including the rotating body according to the present embodiment are characterized in that the n buckets 400 are fastened to the rotor 300 in a tangential entry manner, All of the buckets 400 are formed to be supported by the rotor 300 so that they can be stably fixed to the rotor 300. That is, the second circumferential dovetail projections 324 of the converter 320 fill the cut-off portions of the first circumferential dovetail projections 314 of the rotor wheel 310 that are disconnected by the tangential entry 312 The first bucket 4001 to the n-1th bucket 400n-1 as well as the n-th bucket 400n-1, which is the final bucket 400, are formed as the one circular annular dovetail projections R, (400n) may be supported by the one annular dovetail projections (R). Accordingly, a considerable load is prevented from concentrating on a specific dovetail portion, the damage of the dovetail due to the concentration of the load is prevented, and the problem of the detachment of the rotor 300 of the bucket 400 due to the damage of the dovetail is prevented .

As the n buckets 400 are moved in the circumferential direction of the rotor 300 as a whole through the third step S3 to the fifth step S5 and are positioned at the predetermined positions, The buckets 320 and the buckets 400 are prevented from being displaced in the axial direction and the radial direction of the rotor 300 so that the n buckets 400 can be more securely fastened to the rotor 300.

And, as the n buckets 400 are fixed at the predetermined positions via the sixth step S6, the n buckets 400 can be prevented from being displaced from the predetermined positions . The n buckets 400 can be more stably coupled to the rotor 300 and the n buckets 400 can be rotated in the circumferential direction of the rotor 300 300, the energy of the steam can not be completely converted into mechanical work, and the efficiency is lowered.

The present embodiment includes the axial dovetail groove 316 and the axial dovetail projection 326 so that the converter 320 is moved along the axial direction of the rotor 300 to rotate the rotor wheel 310 And is configured to prevent the converter 320 from deviating in the circumferential direction and the radial direction of the rotor 300. However, the present invention is not limited thereto, and the axial dovetail groove 316 and the axial dovetail projection 326 may not be formed. In this case, the operation effect that the n buckets 400 are supported by the rotor wheel 310 and the converter 320 can be substantially equivalent to those of the present embodiment. In this case, since the converter 320 is moved in the axial direction of the rotor 300 as well as in the radial direction of the rotor 300 and is detachable to the rotor wheel 310, Assembly and detachment between the rotor wheels 310 can be facilitated. In this case, the converter 320 may rotate the n-1 bucket 400n-1 and the n-th bucket 400n among the n buckets 400 disposed at the predetermined positions, The rotor 320 may be prevented from being disengaged in the axial direction and the radial direction of the rotor 300 and the rotor 320 may be prevented from being disengaged in the axial direction and the radial direction of the rotor 300, However, in order to prevent stable coupling between the converter 320 and the rotor wheel 310 and excessive residual stress, the axial dovetail grooves 316 and the axial dovetail projections 316, (326). ≪ / RTI >

Meanwhile, the present embodiment includes the converter 320, but may not include the converter 320. That is, although not shown separately, in a state where the first to n-th buckets 4001 to 400n-1 are assembled to the rotor wheel 310, the n-th bucket 400n is connected to the tangential entry And the n buckets 400 may be entirely moved along the circumferential direction of the rotor 300 to be disposed at the predetermined positions. In this case, all of the n buckets 400 can be supported by the rotor 300, and the action and effect can be similar to those of the present embodiment. That is, a part of the tangential entry 312 is connected to a part of one of the n buckets 400 (for example, the (n-1) th bucket 400n-1) And the remainder of the tangential entry 312 overlaps a portion of the bucket 400 (e.g., the nth bucket 400n) adjacent to the one bucket 400 and a portion of the bucket 400 (E.g., n-1) buckets 400n-1 are overlapped in the axial and radial directions of the first circumferential dovetail projections 300, And the adjacent bucket 400 (e.g., the nth bucket 400n) may be supported by the first circumferential dovetail projections 314, although it is a part. However, in this case, since the mass unbalance of the rotor 300 and excessive stress concentration may occur in a part of the first circumferential dovetail projections 314, Lt; / RTI >

Meanwhile, in the present embodiment, the n buckets 400 are moved by half pitch in the fifth step S5, but are not limited thereto.

That is, the predetermined position is determined by the first to n-th buckets 4001 to 400n-1 assembled to the rotor wheel 310 and the n-th bucket 400n-1 assembled to the converter 320, 400n may be a position that is moved along the circumferential direction of the rotor 300 as a whole less than half pitch or less than a half pitch above the zero pitch. Accordingly, a contact portion between the first circumferential dovetail projections 314 and the second circumferential dovetail projections 324 is formed in the axial direction of the n-1 bucket 400n-1 and the rotor 300, The first circumferential dovetail projections 314 and the second circumferential dovetail projections 324 overlap in the radial direction and overlap at a position deviated from the center side of the n-1th bucket 400n-1, Can be overlapped in the axial direction and the radial direction of the n-th bucket (400n) and the rotor (300) and deviated from the center side of the n-th bucket (400n). In this case, the effect of preventing the converter 320 and the bucket 400 from being displaced in the axial direction of the rotor 300 can be greatly reduced as compared with the present embodiment. However, in this case, it may be disadvantageous in terms of stress design.

Alternatively, the predetermined position may be determined by the first to n-th buckets 4001 to 400n-1 assembled to the rotor wheel 310 and the n-th bucket 400n-1 assembled to the converter 320, The first circumferential dovetail projections 314 and the second circumferential dovetail projections 324 are moved in the n-2 th buckets 400, And another contact portion between the first circumferential dovetail projections 314 and the second circumferential dovetail projections 324 overlaps in the axial direction and the radial direction of the rotor 300 and the n-1 th buckets 400n -1) and the rotor 300 in the axial direction and the radial direction. In this case, the effect of preventing the converter 320 and the bucket 400 from being displaced in the axial direction of the rotor 300 can be greatly reduced as compared with the present embodiment. However, in this case, since the n buckets 400 need to be moved a considerable amount of time, the time and cost can be considerably increased.

In the present embodiment, the first pinhole H1 is formed on the circumferential center side of the second circumferential direction dovetail projections 324, and the second pinhole H2 is formed on the n-1 th Is formed between the root portion 410 of the n-th bucket 400n-1 and the root portion 410 of the n-th bucket 400n. However, the present invention is not limited thereto.

That is, the first pinhole H1 is formed on the second circumferential dovetail projections 324, and the second circumferential dovetail projections 324 are formed on the second circumferential dovetail projections 324 on the assumption that the n buckets 400 are shifted by half pitch. The second pinhole H2 is formed at a position deviated from the center in the circumferential direction and the second pin hole H2 is formed in the root portion 410 of the n-1th bucket 400n-1 or the root portion 410 of the nth bucket 400n. Respectively.

Alternatively, even if the first pinhole H1 is formed on the circumferential center side of the second circumferential direction dovetail projection 324 as in the present embodiment, the predetermined position is such that the n- In a position slightly or more shifted than the pitch, the second pinhole H2 may be formed to face the first pinhole H1 at that position. In this case, the second pinhole H2 may be formed only in the root portion 410 of any one of the buckets 400, or may be formed in the other two buckets 400 adjacent to each other (for example, The second bucket 4002).

Or the first pin hole H1 is formed in the first circumferential dovetail projection 314 and the second pin hole H2 is formed in either one of the n buckets 400 or two buckets 400, respectively.

Considering the advantage of half pit movement (manufacturing time and cost reduction) of the n buckets 400 and mass balancing and stress design of the rotors 300 and 400, the first pin holes H1 and The second pinhole H2 may be formed as in the present embodiment.

On the other hand, the dovetail projections and grooves can be formed opposite to each other.

That is, in the rotor 300, a first circumferential dovetail groove and a second circumferential dovetail groove are formed instead of the first circumferential dovetail projections 314 and the second circumferential dovetail projections 324, 400 may be formed with circumferential dovetail projections instead of the circumferential dovetail grooves 412.

An axial dovetail groove may be formed in place of the axial dovetail groove 316 in the rotor wheel 310 and an axial dovetail groove may be formed in the converter 320 in place of the axial dovetail projection 326 .

100: casing 300: rotor
310: Rotor wheel 312: Tangential entry
314: First circumferential dovetail projection 316: Axial dovetail groove
320: converter 324: second circumferential dovetail projection
326: axial dovetail projection 400: bucket
4001: first bucket 4002: second bucket
400n-1: n-1 th bucket 400n: control n bucket
410: root portion 412: circumferential dovetail groove
420: wing portion H1: first pin hole
H2: Second pin hole P: Pin

Claims (15)

A rotor rotatably installed; And
And n buckets fastened to the rotor to convert the energy of the vapor injected from the nozzle into mechanical work,
The rotor may include:
A rotor wheel having the tangential entry; And
And a converter for filling the tangential entry,
Wherein the rotor wheel is angled radially inwardly of the rotor from the tangential entry and extends along an axial direction of the rotor and includes at least one circumferentially raised ridge portion and a circumferentially- An axial dovetail groove having at least one depression,
The converter including an axial dovetail projection having at least one raised portion circumferentially raised and a set of at least one circumferentially precipitated portion of the rotor to engage the axial dovetail groove,
The n buckets are fastened to the rotor in a tangential entry manner,
And all of the n buckets are supported by the rotor. The method according to claim 1,
Wherein the tangential entry of the rotor is such that the n buckets are generally moved along the circumferential direction of the rotor such that a portion of the tangential entry is offset from a portion of one of the n buckets and a portion of the bucket in the axial and radial directions And the remainder of the tangential entry is overlapped with a portion of the bucket adjacent to the one bucket in the axial and radial directions of the rotor. The method according to claim 1,
Wherein the converter is formed to be moved along an axial direction of the rotor and to be coupled to the rotor wheel. The method according to claim 1,
Wherein the rotor wheel includes a first circumferential dovetail projection extending circumferentially of the rotor from the tangential entry and being torn by the tangential entry,
Wherein the converter includes a second circumferential dovetail projection that fills the cutaway portion of the first circumferential dovetail projection. 5. The method of claim 4,
Wherein the first circumferential dovetail projections and the second circumferential dovetail projections form one annular dovetail projection. 5. The method of claim 4,
Wherein the second circumferential dovetail projections are configured to support at least one bucket out of the n buckets. 6. The method of claim 5,
In each bucket,
A root portion having a circumferential dovetail groove to be engaged with a part of the one annular dovetail projection; And
And a wing portion projecting from the root portion in the radial direction of rotation of the rotor. 8. The method of claim 7,
Wherein the length of the tangential entry, the length of the second circumferential dovetail projection, the length of the root portion, and the length of the circumferential dovetail groove are all the same in the circumferential direction of the rotor. 9. The method of claim 8,
The first to n-l < th > buckets are inserted in the circumferential direction of the rotor through the circumferential dovetail grooves of each bucket, the tangential entry of the rotor wheel and the first circumferential dovetail projections of the rotor wheel, Sequentially assembled,
A n-th bucket is assembled with the converter through a circumferential dovetail groove of the n-th bucket and a second circumferential dovetail projection of the converter,
The converter assembled with the nth bucket is assembled with the rotor wheel assembled with the first bucket to the (n-1) th buckets by being inserted into the tangential entry in the axial direction of the rotor,
The first to (n-1) th buckets assembled to the rotor wheel and the n-th bucket assembled to the converter are entirely moved to a predetermined position along the circumferential direction of the rotor,
The first circumferential dovetail projections and the second circumferential dovetail projections overlap each other in the axial direction and the radial direction of the n-1 < th > bucket and the rotor,
And another contact portion between the first circumferential dovetail projections and the second circumferential dovetail projections overlap in the axial direction and the radial direction of the nth bucket and the rotor. 10. The method of claim 9,
The length of the root portion in the circumferential direction of the rotor is referred to as one pitch and the predetermined position is defined by the first bucket to the (n-1) th bucket assembled to the rotor wheel, wherein the n buckets are moved along the circumferential direction of the rotor by half pitch as a whole. 10. The method of claim 9,
And fixing means for fixing said first to n < th > buckets to said predetermined positions. 12. The method of claim 11,
Wherein,
A first pin hole formed in the first circumferential dovetail projection or the second circumferential dovetail projection;
A second pin hole formed in the bucket and opposed to the first pin hole when the first bucket to the nth bucket is located at the predetermined position; And
And a pin inserted into the first pin hole and the second pin hole. 13. The method of claim 12,
The first pinhole is formed through the second circumferential dovetail projection along the axial direction of the rotor at the circumferential center side of the second circumferential dobtail projection,
The second pin hole penetrates the root portion of the n-1-th bucket and the root portion of the n-th bucket along the axial direction of the rotor between the root portion of the n-1-th bucket and the root portion of the n- . Comprising a first step comprising a rotor according to any one of claims 1 to 13 and n buckets;
Wherein the rotor of the rotating body includes a rotor wheel having the tangential entry and a converter for covering the tangential entry, and the first bucket to the n-1 < th > bucket out of the n buckets of the rotating body, A second step of assembling with the rotor wheel by inserting the tangential entry in the circumferential direction of the rotor;
A third step of assembling the n-th bucket among the n buckets of the rotating body with the converter;
A fourth step of inserting the converter assembled with the n-th bucket into the tangential entry in the axial direction of the rotor to assemble the rotor with the rotor wheel assembled with the first bucket to the (n-1) th bucket;
A fifth step of moving the first to n-1th buckets assembled to the rotor wheel and the n-th bucket assembled to the converter by a half pitch as a whole along the circumferential direction of the rotor; And
And fixing the n buckets by inserting the pins of the rotator into the first pin holes formed in the rotor and the second pin holes formed in the bucket. Casing;
The rotating body according to any one of claims 1 to 13, which is rotatably installed in the casing. And
And a nozzle for spraying steam to the rotor.

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