JP6568971B2 - Turbine nozzle plate assembly - Google Patents

Description

  The present invention relates to a nozzle plate assembly for a turbine. More specifically, the nozzle plate assembly can be easily manufactured, and assembly tolerances generated when each blade is assembled can be eliminated. Further, the present invention relates to a turbine nozzle plate assembly for a new type capable of maintaining a stable mounting state.

  In general, a turbine is a device for converting the energy of a fluid such as water, gas, and steam into useful mechanical work.

  A steam turbine to which such a turbine is applied is a device that converts thermal energy of steam into mechanical work, and jets and expands high-temperature and high-pressure steam generated in a boiler to a fixed nozzle plate assembly. The high-speed steam flow generated by is hit against a rotating blade that is rotatably mounted, and the shaft is rotated by its impact or reaction.

  Here, a plurality of nozzle plate assemblies are provided, which are respectively fixed in partitions attached to the respective stages, and the high-pressure steam heat energy is converted into multistage energy to obtain a high output.

  Such steam turbines and nozzle plate assemblies are disclosed in Patent Document 1, Patent Document 2, Patent Document 3, Patent Document 4, and Patent Document 5.

  However, in the case of the conventional general nozzle plate assembly as described above, the inner ring through which the rotation shaft passes and the outer ring fixedly attached to each stage in the housing, and the inner ring and the outer ring are interposed between the inner ring and the outer ring. A plurality of blades positioned to guide the flow of steam. Here, the root and the shroud of each blade are welded and fixed to the outer ring and the inner ring, respectively. Therefore, the directions (angles) of the airfoil portions forming each blade are not uniform, and there is a drawback that the flow of steam passing through the plurality of nozzle plate assemblies is not smooth.

  Of course, as in Patent Document 6, a technique for forming the blades so as to be assembled together is also proposed.

  However, the technique described above is applied to a rotating blade that is rotatably mounted without providing an outer ring, and the nozzle plate assembly has a structure in which each blade is fixed between the outer ring and the inner ring. When applied, the assembly tolerance between the blades accumulates, so that it is not possible to maintain a stable coupling state, and there is a problem that the flow of steam is not smooth and the performance deteriorates due to the phenomenon of floating. .

Korea Registered Patent No. 10-098582 Korean Published Patent No. 10-2007-0028254 Korean Registered Patent No. 10-1513062 Republic of Korea Registered Patent No. 10-1378193 Korean Published Patent No. 10-2014-0130275 Korean Patent Registration No. 10-1190023

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to simplify the nozzle plate assembly by composing each blade, inner ring, and outer ring in an assembling manner. Provided is a new type nozzle plate assembly for a turbine that can be manufactured, eliminates assembly tolerances generated when each blade is assembled, and can maintain a stable mounting state. That is.

  In order to achieve such an object, the turbine nozzle plate assembly of the present invention has a ring-like shape in which the outer peripheral portion is coupled and fixed to the inner peripheral surface of the steam turbine, and the outer peripheral groove is recessed in the inner peripheral surface. Outer ring; a ring-shaped inner ring that is located inside the outer ring, has a central axis penetrated through the center, and has an inner coupling groove in the outer peripheral surface; and one end of the outer ring Two or more blades stacked in close contact with each other by adjusting the direction and speed of steam passing through the corresponding part by being accommodated in the outer coupling groove and the other end being accommodated in the inner coupling groove of the inner ring. , Characterized by comprising;

  Here, each of the outer ring and the inner ring is divided into two semicircular and symmetrical parts, and the blades are brought into close contact with each other to remove play between the outer ring and the inner ring. A play removing unit is further included.

  The play removing portion includes an outer play removing pin, at least a part of which is located between one end of two blades between opposing surfaces between the two divided parts of the outer ring, and the inner ring. An inner play removal pin located at least partially between the other ends of the two blades between the opposing surfaces between the two parts divided from each other, the two play removal pins being located Each of the opposing surfaces between the blades has recesses for accommodating a part of each of the play removing pins, and the opposing surfaces between the two parts of the outer ring divided from each other and the inner ring are divided from each other. A mounting step on which another part of each play removing pin is mounted is recessed in the opposing surface between the two parts, and a bolt is provided between each play removing pin and the mounting step. Characterized in that it is fastened.

  Further, the outer surfaces of both sides of the outer ring are further provided with ring-shaped guide plates that guide the steam passage to the blades and guide the discharge flow of the steam that has passed through the blades. Fastened to the outer surface of both sides of the outer ring and fastened with bolts to the outer surface of the outer ring, respectively, and coupled to each other to guide the flow of steam into the outer ring and each blade, or passed through each blade It is characterized by comprising a bending guide end bent in a round shape so as to guide the discharge of steam.

  Further, the blade comprises a root portion accommodated in the outer coupling groove of the outer ring, a shroud portion accommodated in the inner coupling groove of the inner ring, and a portion between the root portion and the shroud portion, And an airfoil portion for adjusting the direction and speed of the steam, and the front and rear surfaces of the route portion and the shroud portion are formed in a round shape correspondingly so as to be in close contact with each other.

  As described above, the turbine nozzle plate assembly of the present invention manufactures a single turbine nozzle plate assembly by sequential assembly rather than by welding and fixing each blade between the outer ring and the inner ring. As a result, the overall manufacturing operation can be easily and quickly performed.

  In particular, in the turbine nozzle plate assembly of the present invention, while the blades are constructed in an assembling manner, the play generated during the assembly is removed by the play removing unit, thereby preventing the idle movement of each blade. In addition to being able to prevent, it is possible to maintain a precise position at all times, so that there is an effect that a smooth steam flow can be obtained.

  In addition, the turbine nozzle plate assembly of the present invention can provide more stable flow of steam passing through each blade by providing an additional guide plate, and the guide plate is not only a simple fastening system but also a compressed plate. Since they are coupled by a push-in method using a pin, it is possible to prevent the occurrence of floating and to maintain a stable steam flow.

FIG. 1 is an exploded perspective view illustrating a turbine nozzle plate assembly according to an embodiment of the present invention. FIG. 2 is an enlarged view of “A part” in FIG. 1. FIG. 3 is a combined perspective view illustrating a turbine nozzle plate assembly according to an embodiment of the present invention. FIG. 4 is a front view illustrating a turbine nozzle plate assembly according to an embodiment of the present invention. FIG. 5 is a cross-sectional view taken along the line II of FIG. 6 is a cross-sectional view taken along line II-II in FIG. FIG. 7 is a perspective view illustrating a blade of a turbine nozzle plate assembly according to an embodiment of the present invention. FIG. 8 is a perspective view illustrating a close-up stacked state between two blades of a turbine nozzle plate assembly according to an embodiment of the present invention. FIG. 9 is a state diagram illustrating a close-contact lamination state between the blades excluding the outer ring and the inner ring of the turbine nozzle plate assembly according to the embodiment of the present invention. FIG. 10 is an enlarged view of “B section” in FIG. FIG. 11 is an exploded perspective view for explaining the relationship between each blade of the turbine nozzle plate assembly according to the embodiment of the present invention and a play removing portion. FIG. 12 is an enlarged view of a main part for explaining the installation structure of the play removing portion of the turbine nozzle plate assembly according to the embodiment of the present invention. FIG. 13 is an enlarged view of a main part for explaining the installation structure of the play removing portion of the turbine nozzle plate assembly according to the embodiment of the present invention.

  Preferred embodiments of the turbine nozzle plate assembly of the present invention will be described below with reference to FIGS.

  1 is an exploded perspective view illustrating a turbine nozzle plate assembly according to an embodiment of the present invention, and FIG. 3 is a diagram illustrating a turbine nozzle plate assembly according to an embodiment of the present invention. FIG. 4 is a front view illustrating a turbine nozzle plate assembly according to an embodiment of the present invention, and FIGS. 5 and 6 illustrate a turbine nozzle plate assembly according to an embodiment of the present invention. It is sectional drawing according to each direction shown for demonstrating.

  As shown in these drawings, the turbine nozzle plate assembly according to the embodiment of the present invention roughly includes an outer ring 100, an inner ring 200, and a plurality of blades 300. In particular, each blade 300 has an assembly type structure in which one end is coupled to the outer ring 100 and the other end is coupled to the inner ring 200 and is stacked in close contact with each other. And

  This will be described in more detail for each configuration as follows.

  First, the outer ring 100 is provided so as to form an outer peripheral portion of a turbine nozzle plate assembly.

  Such an outer ring 100 is formed in a circular ring shape having a perforated inside, and an outer peripheral portion is coupled and fixed to an inner peripheral surface of the steam turbine.

  An outer coupling groove 130 is recessed in the inner peripheral surface of the outer ring 100. The outer coupling groove 130 is a portion to which one end of each blade 300 described later is coupled.

  Particularly, in the embodiment of the present invention, the outer ring 100 is divided into a semicircular first unit outer ring 110 and a second unit outer ring 120 which are symmetrical to each other, and the two unit outer rings thus divided are used. 110 and 120 are configured to be coupled to each other by an outer coupling pin 140 to form a ring-shaped outer ring 100.

  Here, a pin coupling hole 111 for coupling the outer coupling pin 140 is formed on the opposing surface between the two unit outer rings 110 and 120 so as to correspond to each other. Is configured to be inserted.

  Next, the inner ring 200 is provided to form an inner portion of the turbine nozzle plate assembly.

  Such an inner ring 200 is positioned inside the outer ring 100, is formed in a ring shape, and is configured such that a central axis (not shown) penetrates through the open center.

  At the same time, an inner coupling groove 230 is formed in the outer peripheral surface of the inner ring 200. The inner coupling groove 230 is a part to which the other end of each blade 300 described later is coupled.

  In particular, in the embodiment of the present invention, the inner ring 200 is divided into a semicircular symmetrical first unit inner ring 210 and second unit inner ring 220, and the two unit inner rings divided in this way. 210 and 220 are coupled to each other by an inner coupling pin 240 to form a ring-shaped inner ring 200.

  Here, a pin coupling hole 211 for coupling the inner coupling pin 240 is formed on the opposing surface between the two unit inner rings 210 and 220 so as to correspond to each other, and a part of the inner coupling pin 240 is formed therein. Is configured to be inserted. This is as shown in FIG. 1 of the accompanying drawings.

  Next, each blade 300 is configured to adjust the direction and speed of steam passing between the outer ring 100 and the inner ring 200.

  Particularly, in the embodiment of the present invention, two or more blades 300 described above are provided and are configured to be stacked in close contact with each other.

  That is, in the embodiment of the present invention, after the plurality of blades 300 are sequentially inserted between the two unit outer rings 110 and 120 and the two unit inner rings 210 and 220 having a semicircular ring shape, the two unit outer rings are inserted. 110, 120 and the coupling between the two unit inner rings 210, 220 make a turbine nozzle plate assembly.

  As shown in FIG. 7 of the accompanying drawings, each of the blades 300 is accommodated in a route portion 310 accommodated in the outer coupling groove 130 of the outer ring 100 and in an inner coupling groove 230 of the inner ring 200. It comprises a shroud portion 320 and an airfoil portion 330 that forms a portion between the root portion 310 and the shroud portion 320 and adjusts the direction and speed of steam.

  Here, the root portion 310 and the outer coupling groove 130, and the shroud portion 320 and the inner coupling groove 230 are formed in a corresponding bent structure to prevent radial movement, and each blade. The opposing surfaces which are the front surface and the rear surface of the root portion 310 and the shroud portion 320 forming 300 are formed to correspond to each other so as to be in close contact with each other.

  Particularly, the front surface and the rear surface of the root part 310 and the shroud part 320 are formed in a round structure corresponding to each other and are configured to closely contact each other as shown in FIG. 8 of the accompanying drawings. As a result, by maximizing the contact area between the blades 300, the pressure of the steam passing through the airfoil portion 330 can be dispersed to minimize the shaking.

  Further, an auxiliary concave groove 231 is further formed in the inner coupling groove 230 of the inner ring 200 and further recessed inside the corresponding inner ring 200, and an inner surface of the auxiliary concave groove 231 is formed on the outer peripheral surface of the shroud portion 320. A coupling protrusion 322 to be inserted into is inserted.

  Meanwhile, the root part 310 and the shroud part 320 may have various shapes. For example, as shown in each figure, in the case of the route part 310, when viewed from a plane, it may be formed to have a “T” shape. It can be formed in various shapes such as “I” shape and “L” shape.

  In addition, the embodiment of the present invention further includes a play removing unit 400 provided to remove play between the blades 300.

  That is, in the case of the blades 300 stacked between the outer ring 100 and the inner ring 200, it may be said that the two unit outer rings 110 and 120 and the two unit inner rings 210 and 220 are coupled to each other in a state of being in close contact with each other. There is only play between the blades 300. In this case, since the play may cause a problem that the steam passing through the airfoil portion 330 of each blade 300 cannot smoothly flow, play between the blades 300 can be provided by additionally providing the play removal unit 400. Can be removed.

  Such a play removing unit 400 is located between the opposing surfaces between the two unit outer rings 110 and 120 of the outer ring 100 and at least partly between the root portions 310 of the two blades 300 located in the corresponding part. And at least one between the shroud portions 320 of the two blades 300 located between the opposing surfaces between the two unit inner rings 210 and 220 of the inner ring 200 and the outer play removing pin 410. And an inner play removing pin 420 on which the portion is located.

  In particular, the play removing pins 410 and 420 are disposed on the facing surface between the root portions 310 of the two blades 300 where the play removing pins 410 and 420 are located and on the facing surface between the coupling protrusions 322 formed on the shroud portion 320. , 420 are housed in steps (refer to FIG. 11 of the accompanying drawings), and the outer coupling grooves on the opposing surfaces between the unit outer rings 110 and 120 and the unit inners are formed. Mounting steps 113 and 213 to which other portions of the play removing pins 410 and 420 are mounted are formed in the auxiliary concave grooves 231 on the opposing surface between the rings 210 and 220, respectively.

  Here, the outer play removing pin 410 is positioned so that a part thereof is inserted into the accommodation step 311 formed on the opposing surface between the root portions 310 forming the two blades 300, and the other part is The inner play removal pin 420 is fastened to a mounting step 113 formed on the opposing surface between the unit outer rings 110 and 120, and a part of the inner play removal pin 420 is formed between the coupling protrusions 322 of the shroud portions 320 forming the two blades 300. It is fastened and fixed to the accommodation step 321 formed on the opposite surface of the other, and the other part is mounted on the mounting step 213 formed on the opposite surface between the unit inner rings 210 and 220. This is as shown in FIGS. 9 to 13 of the accompanying drawings.

  That is, each blade 300 is assembled between each unit outer ring 110, 120 and each unit inner ring 210, 220 by the structure of each of the play removal pins 410, 420, the accommodation steps 311, 321 and the mounting steps 113, 213 described above. 1 is provided, so that each nozzle plate assembly divided in half as shown in FIG. 1 of the accompanying drawings is combined with each other, and then combined with one another as shown in FIG. 2 of the accompanying drawings. A nozzle plate assembly can be completed.

  Of course, although not shown in the drawing, the play removal unit 400 uses one of the two play removal pins 410 and 420 to restrain and release one side of the blade 300 and the corresponding blade. The other side of 300 may be configured to restrain and release play by, for example, a pin passing through the blade 300 or other structure.

  Meanwhile, in an embodiment of the present invention, it is further provided that guide plates 510 and 520 are further provided on both outer surfaces of the outer ring 100, respectively.

  One guide plate 510 of each of the guide plates 510 and 520 described above guides the passage of steam to the blades 300, and the other guide plate 520 guides the discharge flow of the steam that has passed through the blades 300. And is formed into a ring shape and includes fastening ends 511 and 521 and bending guide ends 512 and 522.

  Here, the fastening ends 511 and 521 are portions that are in close contact with both outer surfaces of the outer ring 100 and are fastened to the outer surface of the outer ring 100 with bolts, and the bending guide ends 512 and 522 are the outer ring 100. And a portion bent in a round shape so as to guide the inflow of steam into each blade 300 or guide the discharge of the steam that has passed through each blade 300.

  Here, the fastening ends 511 and 521 and the outer surface of the outer ring 100 may be further compressed by a cut-off ring-shaped compression pin 530 (see an enlarged portion in FIG. 1 of the accompanying drawings) formed on one side so as to be compressed and restored. By being coupled, the guide plates 510 and 520 are configured to be prevented from floating in the circumferential direction of the outer ring 100.

  On the other hand, the unexplained reference numeral 114 (see FIG. 13 of the accompanying drawings) indicates an avoidance step, and when the root portion 310 of the blade 300 is inserted into the outer coupling groove 130, it is smoothly coupled by interference between the corner portions. In order to prevent this in advance, a step portion is recessed in the corner portion.

  Hereinafter, the assembling process of the turbine nozzle plate assembly according to the embodiment of the present invention will be described in more detail.

  First, two unit outer rings 110 and 120 manufactured separately from each other, two unit inner rings 210 and 220, and each blade 300 are prepared.

  In this state, after arranging any one outer ring (for example, first unit outer ring) 110 and any one unit inner ring (for example, first unit inner ring) 210 on the inner and outer sides, respectively, Each blade 300 is inserted sequentially. At this time, each blade 300 is mounted by sequentially inserting the root portion 310 and the shroud portion 320 into the outer coupling groove 130 of the first unit outer ring 110 and the inner coupling groove 230 of the first unit inner ring 210.

  If all the blades 300 are mounted between the two unit outer rings 110 and 120 and the two unit inner rings 210 and 220 according to the above-described process, a part of the outer play removing pin 410 is attached to each root portion. Each blade is inserted into the accommodation step 113 formed on the opposing surface between 310 and the other part by fastening with bolts to the mounting step 113 formed on the opposing surface between the two unit outer rings 110, 120. 300 is removed from the root portion 310, and a part of the inner play removing pin 420 is bolted to a receiving step 321 formed on the opposing surface between the coupling protrusions 322 of the shroud portions 320 forming the two blades 300. The mounting step 213 is formed on the opposite surface between the two unit inner rings 210 and 220 while being fastened. Removing play against the shroud portion 320 of each blade 300 by placing.

  Then, the two half turbine nozzle plate assemblies thus completed are arranged so as to face each other with the coupling pins 140 and 240 interposed therebetween as shown in FIG. This completes the assembly of the single turbine nozzle plate assembly as shown in FIG. 2 of the accompanying drawings.

  Meanwhile, the guide plates 510 and 520 may be fixed to the outer surfaces of both sides of the outer ring 100 after the assembly of the single turbine nozzle plate assembly is completed, and one half of the turbine nozzle plate assembly is completed. After that, the assembly order can be freely changed as necessary, for example, the outer ring 100 can be fixed to the outer surfaces on both sides.

  As a result, the turbine nozzle plate assembly of the present invention is manufactured by sequentially assembling the single nozzle plate for a turbine plate instead of welding each blade 300 between the outer ring 100 and the inner ring 200 by welding. Thus, the entire manufacturing operation can be easily performed.

  In particular, in the turbine nozzle plate assembly of the present invention, while the blades 300 are constructed in an assembling manner, the play generated during the assembly is removed by the play removing unit 400, so that each blade 300 is in operation. In addition to preventing the movement of water, it is possible to always maintain an accurate position, so that a smooth steam flow can be ensured.

  In addition, the turbine nozzle plate assembly of the present invention allows the steam passing through each blade 300 to flow more stably by providing the guide plates 510 and 520, and the coupling of the guide plates 510 and 520 is simple. Since not only the fastening method but also the pushing method using the compression pin 530 is used, it is possible to prevent the occurrence of floating and to maintain a stable steam flow.

100; outer ring, 110; first unit outer ring, 111; pin coupling hole,
113; Installation stage, 114; Avoidance stage, 120; Second unit outer ring,
130; outer coupling groove; 140; outer coupling pin;
200; inner ring, 210; first unit inner ring, 211; pin coupling hole,
213; mounting stage, 220; second unit inner ring,
230; inner coupling groove, 231; auxiliary concave groove, 240; inner coupling pin,
300; blade, 310; root portion, 311, 321;
320; shroud part, 322; coupling protrusion, 330; airfoil part,
400; Play removal portion 410; Pin for outer play removal 420; Pin for inner play removal
510, 520; guide plate, 511, 521; fastening end, 512, 522; bending guide end,
530: compression pin.

Claims (2)

A ring-shaped outer ring in which the outer peripheral portion is coupled and fixed to the inner peripheral surface of the steam turbine and the outer peripheral groove is recessed in the inner peripheral surface;
A ring-shaped inner ring located inside the outer ring and having an inner coupling groove recessed in the outer peripheral surface; and a root portion accommodated in the outer coupling groove of the outer ring, and an inner coupling of the inner ring Two or more blades, each including a shroud portion received in a groove and an airfoil portion forming a portion between the root portion and the shroud portion,
The outer ring and the inner ring are each divided into two semicircular symmetrical unit outer rings and two unit inner rings,
Pin coupling holes for coupling outer coupling pins are formed corresponding to each other on the opposing surface between the two unit outer rings, and a part of the outer coupling pins are inserted into the pin coupling holes. A pin coupling hole for coupling the inner coupling pin is formed corresponding to each other on the opposing surface between the two unit inner rings, and a part of the inner coupling pin is inserted therein.
An auxiliary concave groove is formed in the inner coupling groove of the inner ring. The auxiliary concave groove is formed in the inner ring of the inner ring. The connecting projection is
The accommodation steps are stepped on the opposing surface between the root portions of the two blades and the opposing surface between the coupling protrusions formed on the shroud portion, which are located at the part divided into two unit outer rings and two unit inner rings. A mounting step is formed in each of the outer coupling groove on the opposing surface between the two unit outer rings and the auxiliary concave groove on the opposing surface between the two unit inner rings,
An outer play removing pin and an inner play removing pin are further provided between the two blades positioned so as to coincide with each other at the divided portions of the outer ring and the inner ring,
The outer play removing pin is inserted into a receiving stage formed on a facing surface between the root portions, a part of the two blades, and the other part is a facing surface between the two unit outer rings. It is configured to remove play with respect to the root portion of each blade by being fastened and fixed to the mounting stage formed in
The inner play removing pin is fastened and fixed to a receiving stage formed on a facing surface between the coupling protrusions of each shroud portion, part of the two blades, and the other part is between the two unit inner rings Configured to remove play on the shroud portion of each blade by being placed on a mounting step formed on the opposite surface of
The outer surfaces of both sides of the outer ring are further provided with ring-shaped guide plates that guide the steam passage to the blades and guide the discharge flow of the steam that has passed through the blades.
Each guide plate is
A fastening end that is in close contact with both outer surfaces of the outer ring and fastened with bolts to the outer surface of the outer ring;
Each of which is coupled to each other, and includes an outer ring and a bending guide end that is bent in a round shape so as to guide the inflow of steam to each blade or guide the discharge of steam that has passed through each blade,
The fastening end and the outer surface of the outer ring are further coupled by a cut-out ring-shaped compression pin formed on one side so as to be compressible and recoverable, so that the guide plates are arranged in the circumferential direction of the outer ring. A turbine nozzle plate assembly, wherein the turbine nozzle plate assembly is configured to prevent floating . 2. The turbine nozzle plate assembly according to claim 1, wherein the front surface and the rear surface of the root portion and the shroud portion are formed in a corresponding round shape so as to be in close contact with each other.

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