Seal device for power generation turbine

Abstract

To provide a seal device capable of reducing a flow amount of leaked fluid flowing between a rotor and a fixed body of a power generation turbine.SOLUTION: A seal device according to the present invention comprises: a base part connected to a fixed body; and at least one protrusion part that is formed on the base part, extends from the base part toward a rotor, keeps an end part of a free end out of contact with the rotor, and reduces a flow rate of leaked fluid.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a sealing device for a power generation turbine, and more particularly, to a sealing device for a power generation turbine that can significantly reduce the flow rate of leakage fluid flowing between a rotating body having a rotor of the power generation turbine and a stationary body having a casing by means of a porous structure.

Background Art

[0002] Generally, a turbine refers to a machine that converts the energy of a fluid such as water, gas, or steam into useful mechanical work.

[0003] That is, a turbo-type machine in which a plurality of blades or vanes are implanted on the circumference of a rotating body and steam or gas is ejected there to cause high-speed rotation is called a turbine. As power generation in the industry progresses, turbines such as steam turbines and gas turbines are gradually increasing in size and pressure.

[0004] In such a turbine, steam leakage occurring at the sealing portion between the rotor having a rotor and the stator is a main factor that reduces the efficiency of the turbine and increases the fuel cost. Therefore, a sealing technique for reducing steam leakage, that is, a design technique for a sealing device is very important.

[0005] That is, the sealing device is a sealing device made of a stainless steel material used for a high-pressure turbine for gas power generation and steam power generation, and has a function of preventing leakage of gas, steam, etc. and maximizing the efficiency of energy production of the generator, and plays an important role in preventing vibration of the rotor.

[0006] FIG. 1 is a cross-sectional view showing a state where a normal sealing device is mounted on a turbine.

[0007] As shown in FIG. 1, a normal sealing device 5 is provided on the outer ring and the inner ring of a partition wall 3 mounted on a casing 2.

[0008] Figure 2 is a cross-sectional view showing a normal labyrinth seal device.

[0009] As shown in Figure 2, the seal device 5 is of a labyrinth-type having sharp teeth 6 that are widely used as a non-contact annular seal device for a turbine, and it reduces the leakage flow rate by utilizing the throttling process of the fluid flowing in the turbine. The teeth 6 are sequentially arranged on the stator, and the pressure drop effect generated in the process where the fluid repeats throttling and expansion is used to reduce the leakage flow rate of the fluid.

[0010] However, when using the labyrinth-type seal device 5 to seal a space, the efficiency loss generated by the fluid leaking from the gap between the rotating body 1 and the seal device 5 accounts for more than 33% of all turbine efficiency losses.

[0011] That is, the gap between the seal device 5 and the rotating body 1 can be formed smaller to reduce the loss due to steam leakage. However, when the gap decreases due to vibrations of the rotating body 1 or distortions caused by thermal imbalance, etc., and the seal device 5 and the rotating body 1 come into contact and a rubbing phenomenon occurs, there is a problem that the teeth 6 of the seal device 5 wear and the sealing effect deteriorates over time.

[0012] That is, relatively large vibrations can occur during startup compared to normal operation. At this time, the gap between the rotating body 1 and the seal device 5 must be greater than a certain distance. However, the larger the gap between the seal device 5 and the rotating body 1 is formed, the greater the leakage amount of the fluid becomes, resulting in a reduction in the sealing effect and an even greater increase in the efficiency loss of the turbine.

[0013] To solve such problems, a brush-type seal device including a brush made of an alloy in which nickel, chromium, tungsten, and molybdenum are mixed and made based on a wire having the thickness of hair has been proposed. However, due to the high price of the brush and the complicated manufacturing process, the problem that the manufacturing cost of the brush-type seal device becomes extremely high still exists.

Prior Art Documents

Patent Documents

[0014]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0015] The present invention has been devised to solve the above-described problems. More specifically, compared with a conventional seal device for a turbine, it is possible to significantly reduce the amount of leakage fluid flowing between a rotating body and a stationary body of a power generation turbine, reduce the efficiency loss of the turbine, and provide a seal device for a power generation turbine capable of significantly reducing the manufacturing cost.

Means for Solving the Problems

[0016] A seal device for a power generation turbine according to an embodiment of the present invention is a seal device for reducing the flow rate of leakage fluid flowing between a rotating body and a stationary body of a power generation turbine. The seal device includes a base portion coupled to the stationary body, and at least one or more protrusions formed on the base portion, extending from the base portion toward the rotating body, maintaining a state in which an end portion of a free end is not in contact with the rotating body, and reducing the flow rate of the leakage fluid.

[0017] More specifically, the seal device further includes at least one or more porous structures detachably coupled to the base portion and extending in a direction intersecting the flow direction of the leakage fluid from the base portion.

[0018] More specifically, the porous structure is characterized in that a plurality of pores are irregularly formed, and a leakage fluid is introduced toward the pores.

[0019] More specifically, the porous structure is manufactured based on a metal in which one or more selected from the group consisting of copper, nickel, aluminum, molybdenum, silver, platinum, gold, magnesium, tin, tungsten, cobalt, titanium, and iron are mixed.

[0020] More specifically, the porous structure is disposed at the rear end of at least one or more protrusions.

[0021] More specifically, the sealing device further includes a support member provided to support one or more selected positions of the front and rear of the porous structure in order to fix the porous structure to the base.

[0022] More specifically, the porous structure is formed such that an end portion of a free end of the porous structure protrudes more than an end portion of a free end of the support member.

[0023] More specifically, the porous structure is characterized in that an end portion of a free end of the porous structure is disposed at a predetermined distance from the rotating body.

[0024] More specifically, the porous structure is disposed such that an end portion of a free end of the porous structure contacts the rotating body and is made of a material deformable when an external force is applied.

[0025] More specifically, the porous structure is press-fixed to the support member, and a porosity of an area pressed by the support member is lower than or equal to a porosity of an area not pressed by the support member.

[0026] Also, in the seal device for a power generation turbine according to an additional embodiment of the present invention, one end of the support member is fastened to the base portion, and the end portion of the free end extends toward the rotating body and includes a support body that houses a part of the porous structure. The support body further includes a tapered portion formed along the inner wall of the support body in a direction in which the thickness of the end portion of the free end of the support member becomes thinner downward.

[0027] More specifically, when an external force is applied to the porous structure, the support member further includes a buffer space portion formed between the inner wall of the support body and the porous structure so that the porous structure can be deformed.

Effects of the Invention

[0028] The seal device for a power generation turbine according to an embodiment of the present invention can vary the fluid flow path by forming a protrusion that reduces the fluid flow rate without directly contacting the rotating body, thereby reducing the fluid leakage amount without interfering with the rotation of the rotating body and increasing the power generation efficiency of the power generation turbine.

[0029] The seal device for a power generation turbine according to an embodiment of the present invention can reduce the fluid leakage amount by dispersing the fluid flow path through the porous structure, thereby increasing the power generation efficiency of the power generation turbine.

[0030] The seal device for a power generation turbine according to an embodiment of the present invention can disperse the flow path of the leaking fluid through a plurality of irregularly formed pores and significantly reduce the flow velocity, thereby reducing the fluid leakage amount in the same time period and increasing the power generation efficiency of the power generation turbine.

[0031] The sealing device for a power generation turbine according to an embodiment of the present invention is manufactured based on an alloy containing a metal in which one or more selected from the group consisting of copper, nickel, aluminum, molybdenum, silver, platinum, gold, magnesium, tin, tungsten, cobalt, titanium, and iron are mixed, so as to prevent damage and distortion from progressing even in a high-temperature and high-pressure environment inside the power generation turbine during operation, thereby ensuring improved operating reliability.

[0032] The sealing device for a power generation turbine according to an embodiment of the present invention is arranged behind any one or more of the protruding portions when the porous structure is arranged, so as not to be first exposed to high-temperature and high-pressure gas, thereby minimizing the displacement and distortion of the porous structure due to the gas.

[0033] The sealing device for a power generation turbine according to an embodiment of the present invention can maintain the shape of the porous structure through the support member and maintain a more firmly fixed state to the base, thereby ensuring improved durability and operating reliability.

[0034] The sealing device for a power generation turbine according to an embodiment of the present invention can minimize the contact between the support member and the rotating body by the end portion of the free end of the porous structure protruding beyond the end portion of the free end of the support member, prevent damage to the support member and displacement of the porous structure that can occur when the support member and the rotating body come into contact with each other, and ensure more improved reliability.

[0035] The sealing device for a power generation turbine according to an embodiment of the present invention can minimize the wear that can occur due to friction between the porous structure and the rotating body by arranging the end portion of the free end of the porous structure to be spaced apart from the rotating body, and extend the life of the porous structure.

[0036] According to an embodiment of the present invention, a sealing device for a power generation turbine can further improve the fluid blocking performance by bringing a porous structure into contact with a rotating body, and since the porous structure can be deformed, it is possible to prevent damage to the porous structure that can occur when contacting the rotating body.

[0037] According to an embodiment of the present invention, a sealing device for a power generation turbine is designed such that the porosity of the portion pressed and fixed by a support member is lowered, so that the fluid blocking performance can be further improved based on the low porosity.

[0038] According to an additional embodiment of the present invention, a sealing device for a power generation turbine can further expand an area where the porosity is gradually decreased through the formation of a tapered portion, thereby further improving the fluid blocking performance accompanying the expansion of the porosity decreasing area.

[0039] According to an additional embodiment of the present invention, a sealing device for a power generation turbine can secure a space through the formation of a buffer space portion so that when an impact is applied to the porous structure by contact with a rotor, the impact can be mitigated while the porous structure is deformed, thus minimizing damage to the power generation turbine.

Brief Description of the Drawings

[0040]

Figure 1

Figure 2

Figure 3

Figure 4

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Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Embodiments for Carrying Out the Invention

[0041] The advantages, features, and methods for achieving them of the present invention should become clear by referring to the embodiments detailed together with the accompanying drawings.

[0042] However, the present invention is not limited to the embodiments disclosed below and can be embodied in various different forms. These embodiments are provided only to complete the disclosure of the present invention and to fully inform those with ordinary knowledge in the technical field to which the present invention pertains of the scope of the invention. The present invention is only defined by the scope of the claims.

[0043] Also, the terms used in this specification are for the purpose of explaining the embodiments and are not intended to limit the present invention.

[0044] In this specification, the singular form also includes the plural form unless otherwise specifically mentioned. The use of "comprises" and / or "comprising" in the specification does not exclude the existence or addition of other components other than the recited components.

[0045] Unless otherwise defined, all terms (including technical and scientific terms) used in this specification can be used in a meaning commonly understood by those with ordinary knowledge in the technical field to which the present invention pertains.

[0046] Hereinafter, with reference to the accompanying drawings, the seal device for a power generation turbine of the present invention will be described in more detail.

[0047] First, FIG. 3 is a usage state diagram showing a state in which the seal device for a power generation turbine according to an embodiment of the present invention is applied to a power generation turbine.

[0048] As shown in FIG. 3, the power generation turbine can include a rotating body 10 having a rotor 11 and blades 12 of the power generation turbine, a stationary body 20 having a casing of the power generation turbine, and a partition wall 30 fastened to the stationary body 20 and extending toward the blade and rotor sides.

[0049] At this time, the partition wall 30 is provided so that the seal device 1000 for the power generation turbine is coupled thereto, and may include a first coupling portion 32a formed at a position adjacent to the shaft of the rotor 11 and a second coupling portion 32b formed at a position adjacent to the blade 12.

[0050] Note that the mounting position of the seal device 1000 for the power generation turbine is not limited, and it is preferably understood that it can be mounted at any place where sealing is required between the rotating rotating body 10 and the fixed fixed body 20, and it is mounted on the movement path of the leakage fluid FL that leaks without penetrating the blade, and the flow rate of the leakage fluid FL can be reduced.

[0051] As shown by the arrow in FIG. 3, most of the steam or gas flowing into the fixed body 20 rotates the blade 12 provided extending to the side of the rotor 11 while passing through the partition 31 of the fixed partition wall, and further, it is guided by the partition 31 to the next blade 12 and rotates, and finally it is discharged to the outside while flowing in this way.

[0052] In this process, when each blade 12 rotates, power generation is performed while the rotating body 10 having the blade 12 rotates.

[0053] At this time, it is desirable that the first coupling portion 32a and the second coupling portion 32b are formed along the outer periphery of the partition wall 30 so that the seal device 1000 is fixed thereto, and a stepped portion protruding along the outer periphery of the seal device 1000 is formed to correspond to the form of the above-described coupling portion and is fitted and fixed to the coupling portion.

[0054] Next, with reference to FIGS. 4 to 7, the seal device for a power generation turbine according to an embodiment of the present invention will be described in more detail.

[0055] FIG. 4 is a perspective view showing a sealing device for a power generation turbine according to an embodiment of the present invention, FIG. 5 is an enlarged view seen from above showing an enlarged A area of FIG. 4, FIG. 6 is an enlarged view seen from below showing an enlarged A area of FIG. 4, and FIG. 7 is a cross-sectional view of the sealing device for a power generation turbine according to an embodiment of the present invention.

[0056] First, the sealing device for the power generation turbine is provided so as to reduce the flow rate of the leakage fluid flowing between the rotating body and the fixed body of the power generation turbine.

[0057] More specifically, the sealing device 1000 is characterized by including a base portion 100, a protruding portion 200, and a porous structure 300.

[0058] First, the base portion 100 is coupled to the fixed body so as to form a ring shape, and a stepped portion having a predetermined shape may be formed at the upper end for fastening to the fixed body.

[0059] At this time, the base portion 100 may be provided in a plurality of divided parts for smooth fastening to the fixed body, and when a plurality of divided base portions 100 are all fastened to the fixed body, the base portions are arranged so that the combined state has a ring shape.

[0060] Further, the protruding portion 200 is formed on the base portion 100 so as to reduce the flow rate of the leakage fluid, and at least one or more are provided so as to extend toward the rotating body when the base portion 100 is fastened to the fixed body.

[0061] In particular, the protruding portion 200 is provided so that the end of the free end is not in contact with the rotating body.

[0062] Also, by forming the protruding portion that reduces the flow rate of the fluid without directly contacting the rotating body, the flow path of the fluid is made variable so as not to interfere with the rotation of the rotating body and to reduce the amount of fluid leakage.

[0063] At this time, the protruding portion 200 can be formed by being processed together during the processing of the base portion 100, and of course, it can be provided to be processed separately after the processing of the base portion 100 and fastened to the base portion 100.

[0064] Next, the porous structure 300 is for reducing the leakage amount of the leakage fluid by dispersing the flow path of the leakage fluid, is made of a metal material, and can include a metal foam in which a large number of pores are formed.

[0065] Metal foam means a foam made of metal, and refers to a material made of a metal material with irregular pores formed inside. It is desirable that the metal foam has corrosion resistance and durability while no reaction occurs when in contact with the flowing-in fluid.

[0066] The formation of the metal foam is to form the metal in the form of thin wire, and by intertwining this irregularly, pores are formed, and through the structural compensation by the pores, it can have overall suitable softness and elastic force.

[0067] In addition, the porous structure 300 in the present application means that it contains at least one or more metals as the main component.

[0068] Here, the statement of using the metal as the main component means that the proportion of the metal is 55% by weight or more, 60% by weight or more, 65% by weight or more, 70% by weight or more, 75% by weight or more, 80% by weight or more, 85% by weight or more, 90% by weight or more, or 95% by weight or more based on the total weight of the metal foam or the metal skeleton. The upper limit of the proportion of the metal contained as the main component is not particularly limited, and for example, it may be 100% by weight.

[0069] And the porous structure 300 can be manufactured based on a metal mixed with one or more selected from the group consisting of copper, nickel, aluminum, molybdenum, silver, platinum, gold, magnesium, tin, tungsten, cobalt, titanium, and iron.

[0070] In particular, the porous structure 300 is fabricated on a base of an alloy containing a metal mixed with one or more selected from the group consisting of copper, nickel, aluminum, molybdenum, silver, platinum, gold, magnesium, tin, tungsten, cobalt, titanium, and iron, so as to ensure that damage and distortion do not occur even in the high-temperature and high-pressure environment inside the operating power generation turbine, thereby ensuring improved operating reliability.

[0071] Here, the porous structure 300 is provided with a plurality of irregularly formed pores, and leakage fluid is introduced toward the pores.

[0072] In particular, through a plurality of irregularly formed pores, the flow path of the leakage fluid can be dispersed and the flow velocity can be significantly reduced, thereby reducing the amount of fluid leakage per unit time and increasing the power generation efficiency of the power generation turbine.

[0073] On the other hand, the porous structure 300 can be provided to have a porosity of 10% - 90%. When the porosity is less than 10%, the problem of reduced durability of the porous structure occurs. When the porosity exceeds 90%, the problem occurs that the flow resistance of the porous structure 300 to the leakage fluid cannot be increased to the extent of reducing the leakage amount of the leakage fluid. Therefore, the above-mentioned range is satisfied.

[0074] Furthermore, through the pores formed in the porous structure 300, various scales, which are residues with fine particle sizes generated during the operation of the power generation turbine, can be collected.

[0075] At this time, as the service life of the porous structure 300 increases, the scale is collected, and thereby the porosity decreases.

[0076] That is, it is possible to increase the flow resistance to the leakage fluid due to the reduction in the porosity of the porous structure 300 accompanying the accumulation of the service life.

[0077] In addition, when the power generation turbine is operating, foreign matter that can be generated inside the casing may be scattered by the high-pressure fluid, resulting in damage to various components constituting the power generation turbine. At this time, by collecting and filtering the foreign matter through the porous structure 300, the scattering of the foreign matter can be minimized, and the component damage of the power generation turbine can also be reduced.

[0078] Further, at least one or more of the porous structures 300 can be fastened to the base 100.

[0079] At this time, the fastening between the porous structure 300 and the base 100 can be coupled by a shape fitting coupling method, and a receiving groove for receiving the porous structure 300 can be formed in the base 100.

[0080] Further, the porous structure 300 is detachably coupled to the base 100 and is formed to extend in a direction intersecting the flow direction of the leakage fluid from the base 100.

[0081] In addition, the porous structure 300 can be formed to extend in the same direction as the extension direction of the protruding portion 200 and can be arranged to restrict the flow of the leakage fluid.

[0082] And the porous structure 300 is arranged at the rear stage of at least one or more protruding portions.

[0083] In particular, the porous structure 300 can be arranged at the rear stage of any one or more of the protruding portions 200.

[0084] By doing so, by preventing the porous structure 300 from being initially exposed to high-temperature and high-pressure gas, it is possible to minimize the displacement, distortion, etc. of the porous structure 300 caused by the gas.

[0085] Also, the porous structure 300 can be arranged so that the end of the free end is kept at a predetermined distance from the rotating body.

[0086] Thereby, wear that can be generated by the friction between the porous structure 300 and the rotating body can be minimized, and the service life of the porous structure 300 can be further extended.

[0087] On the other hand, although not particularly shown in the drawings, the porous structure 300 can be made in a sheet shape or a block shape, and a plurality of them can be fastened to the base 300 in a state of overlapping each other.

[0088] Also, after squeezing at least one or more of the porous structures 300, the squeezed porous structure 300 can be fastened to the base 300, and it goes without saying that a plurality of squeezed porous structures 300 can be fastened to the base 300 in an overlapping state.

[0089] At this time, when squeezing the porous structure 300, squeezing can be performed in the thickness direction of the porous structure, but the squeezing direction is not limited to this.

[0090] In this way, by arranging a plurality of porous structures 300 in multiple stages or by squeezing the porous structure 300, the porosity of the porous structure 300 can be reduced, and thus the fluid blocking rate can be further improved.

[0091] Note that the seal device for a power generation turbine according to an embodiment of the present invention can further include a support member 400.

[0092] More specifically, the support member 400 is provided for fixing the porous structure 300 to the base portion.

[0093] In particular, the support member 400 is configured to support one or more selected positions of the porous structure, either in the front or the rear.

[0094] That is, through the support member 400, the shape of the porous structure can be maintained, and it can be maintained in a more firmly fixed state to the base portion, so that improved durability and operating reliability can be ensured.

[0095] On the other hand, when the porous structure 300 is coupled to the support member 400, the end portion of the free end of the porous structure is formed to protrude more than the end portion of the free end of the support member.

[0096] More specifically, by the end portion of the free end of the porous structure 300 protruding more than the end portion of the free end of the support member 400, the contact between the support member 400 and the rotating body 10 can be minimized.

[0097] Also, it is possible to prevent damage to the support member 400 and detachment of the position of the porous structure 300 that can occur when the support member 400 and the rotating body 10 come into contact with each other, and more improved reliability can be ensured.

[0098] Note that the porous structure 300 is provided so that its position is fixed by being pressed by the support member 400.

[0099] At this time, the porous structure 300 can be formed such that the porosity of the area pressed by the support member 400 is lower than or equal to the porosity of the area not pressed by the support member.

[0100] That is, when designing the porous structure 300, by designing it such that the porosity of the portion pressed and fixed by the support member 400 is low, the fluid blocking performance can be further improved based on the low porosity.

[0101] Next, with reference to FIG. 8, a seal device for a power generation turbine according to another embodiment of the present invention will be described in more detail.

[0102] FIG. 8 is a cross-sectional view of a seal device for a power generation turbine according to another embodiment of the present invention.

[0103] As shown in FIG. 8, the porous structure 300 can be arranged such that the end of the free end of the porous structure 300 contacts the rotating body 10.

[0104] At this time, the porous structure 300 may be made of a material that can be deformed when an external force is applied and may be made of a material having flexibility.

[0105] As described above, by bringing the porous structure 300 into contact with the rotating body 10, the fluid blocking performance can be further improved, and since the porous structure 300 can be deformed, it is possible to prevent damage to the porous structure 300 that may occur when contacting the rotating body 100.

[0106] Next, with reference to FIGS. 9 to 12, a seal device for a power generation turbine according to an additional embodiment of the present invention will be described in more detail.

[0107] FIG. 9 is a cross-sectional view showing a state in which a porous structure and a support member constituting a seal device for a power generation turbine according to a first additional embodiment of the present invention are combined.

[0108] Next, the support member 400 may include a support body 410 and a buffer space portion 420.

[0109] First, one end of the support 410 is fastened to the base 100, and the end of the free end extends toward the rotating body, so that it is provided to accommodate a part of the porous structure.

[0110] At this time, the support 410 can include a tapered portion 411 formed along the inner wall of the support 410 in a direction in which the thickness of the end of the free end of the support member 400 becomes thinner downward.

[0111] In particular, through the formation of the tapered portion 411, an area where the porosity is gradually decreased can be further expanded, so that the fluid blocking performance associated with the expansion of the porosity reduction area can be further improved.

[0112] At this time, the porous structure 300 can include a first area A1 where one surface of the porous structure in a state where no external force is applied to the porous structure abuts against the tapered portion 411, and a second area A2 where one surface of the porous structure 300 is separated from the tapered portion 411 by a predetermined distance.

[0113] Here, the porosity of the first area A1 can be formed to be lower than or equal to the porosity of the second area A2, and in the second area A2, the porous structure 300 can be coupled to the support member 400 such that the porosity gradually decreases in the direction of the first area A1.

[0114] Also, the buffer space portion 420 is formed between the inner wall of the support 410 and the porous structure so that the porous structure 300 can be deformed when an external force is applied to the porous structure 300.

[0115] At this time, the support 410 can have a shape in which the upper end is closed and the lower end is open, and as shown in FIG. 9, the tapered portion 411 and the buffer space portion 420 can be formed on the end side of any one of the ends of a pair of free ends facing each other.

[0116] In particular, through the formation of the buffer space portion 420, when an impact is applied to the porous structure 300 by contact with the rotating body 100, a space can be secured in which the porous structure 300 can relieve the above-described impact while being deformed, and damage to the power generation turbine can be minimized.

[0117] Next, with reference to FIG. 10, a seal device for a power generation turbine according to a second additional embodiment of the present invention will be described.

[0118] FIG. 10 is a cross-sectional view showing a state in which a porous structure and a support member constituting a seal device for a power generation turbine according to a second additional embodiment of the present invention are coupled.

[0119] As shown in FIG. 10, the support 410 can have a shape in which the upper end is closed and the lower end is open, and the tapered portion 411 and the buffer space portion 420 can be formed on both sides of the ends of a pair of free ends facing each other.

[0120] At this time, the porous structure 300 includes a third area A3 which is an area where both side surfaces of the porous structure in a state where no external force is applied to the porous structure are in contact with the tapered portion 411, and a fourth area A4 which is an area where both side surfaces of the porous structure 300 are separated from the tapered portion 411 by a predetermined distance.

[0121] Here, the porosity of the third area A3 can be formed to be lower than or equal to the porosity of the fourth area A4, and in the third area A3, the porous structure 300 can be coupled to the support member 400 such that the porosity gradually decreases in the direction of the fourth area A4.

[0122] In particular, by forming the buffer space portion 420 on both sides of the porous structure 300, the porous structure 300 can be deformed more fluidly. Therefore, even when an impact is applied to the porous structure 300 by the rotating body described above, not only can damage to the rotating body be prevented, but also damage to the porous structure 300 can be prevented.

[0123] Next, with reference to FIGS. 11 and 12, a seal device for a power generation turbine according to a third additional embodiment of the present invention will be described.

[0124] FIG. 11 is a cross-sectional view showing a state in which a porous structure and a support member constituting a seal device for a power generation turbine according to a third additional embodiment of the present invention are coupled, and FIG. 12 is a cross-sectional view showing a state in which a porous structure and a support member constituting a seal device for a power generation turbine according to another embodiment of the third additional embodiment of the present invention are coupled.

[0125] As shown in FIG. 11, the support 410 can have a shape in which the upper end is closed and the lower end is open, and the tapered portion 411 and the buffer space portion 420 can be formed on both sides of the ends of a pair of free ends facing each other.

[0126] At this time, at least one or more bending points 412 can be formed between the upper end and the lower end of the inner wall of the support 410, and the tapered portion 411 can extend and be formed from the bending point 412.

[0127] At this time, the porous structure 300 can include a fifth area A5 which is an area where both side surfaces of the porous structure in a state where no external force is applied are coupled to the inner wall of the support 410, and a sixth area A6 which is an area from the point where the bending point 412 is first formed to the lower end of the porous structure 300.

[0128] Here, the porosity of the fifth area A5 can be formed to be lower than or equal to the porosity of the sixth area A6. In the fifth area A5, the porous structure 300 can be coupled to the support member 400 such that the porosity gradually decreases in the direction of the sixth area A6.

[0129] In particular, by forming at least one or more bending points 412, the pressing force by the support 410 is stronger in the upper end area of the bending point 412 to improve the bonding force, and in the lower end area of the bending point 412, the accommodation space of the support 410 is expanded so that a larger amount of leaked fluid can be accommodated by the porous structure 300 side, thereby ensuring significantly improved fluid blocking performance.

[0130] Also, as shown in FIG. 12, the tapered portion 411, the bending point 412, and the buffer space portion 420 can be respectively formed on both inner side walls of the support 410 with the porous structure 300 as the center. Of course, the formation area of the porous structure 300 can be expanded by the above-described structure.

[0131] Next, referring to FIGS. 13 and 14, the seal device for a power generation turbine according to the fourth additional embodiment of the present invention will be described in more detail.

[0132] FIG. 13 is a cross-sectional view showing a state in which a porous structure and a support member constituting a seal device for a power generation turbine according to the fourth additional embodiment of the present invention are coupled, and FIG. 14 is a cross-sectional view showing a state in which a porous structure and a support member constituting a seal device for a power generation turbine according to another embodiment of the fourth additional embodiment of the present invention are coupled.

[0133] The seal device for a power generation turbine according to the fourth additional embodiment of the present invention can have at least one or more bending points 412 formed on the support 410, similar to the seal device for a power generation turbine according to the third additional embodiment of the present invention.

[0134] In particular, as shown in FIG. 13, in the seal device for a power generation turbine according to the fourth additional embodiment of the present invention, the buffer space portion 420 can be formed in an expanded manner. At this time, when an external force is applied to the porous structure 300, the buffer space portion 420 is formed between the inner wall of the support 410 and the porous structure so that the porous structure 300 can be deformed.

[0135] Also, as shown in FIG. 14, the bending point 412, the tapered portion 411, and the buffer space portion 420 can be respectively formed on both inner side walls of the support 410 with the porous structure 300 as the center, and the formation area of the porous structure 300 can be expanded through the above-described structure.

[0136] As described above, the present invention has been described with reference to the embodiments shown in the drawings, but this is merely for explaining the invention, and those having ordinary knowledge in the technical field to which the present invention pertains should be able to understand that various modifications or equivalent embodiments are possible from the detailed description of the invention.

[0137] Therefore, the true scope of the rights of the present invention must be determined by the technical idea of the claims.

Explanation of Reference Numerals

[0138] 1, 10 Rotating body 2, 20 Casing 3, 30 Partition wall 5 Seal device 6 Tooth 31a, 31b Accommodation groove 40a, 40b Blade FL Leakage fluid 100 Base 200 Protrusion 300 Porous structure 400 Support member 410 Support 411 Tapered portion 412 Bending point 420 Buffer space portion

Claims

1. A sealing device for reducing the flow rate of leakage fluid flowing between a rotating body and a stationary body of a power generation turbine, wherein the sealing device comprises a base portion (100) coupled to the stationary body, and at least one or more protruding portions (200) formed on the base portion, extending from the base portion toward the rotating body, maintaining a state in which the end portion of the free end is not in contact with the rotating body, and reducing the flow rate of the leakage fluid. A sealing device for a power generation turbine, characterized by comprising the above.

2. The sealing device further comprises at least one or more porous structures (300) detachably coupled to the base portion and extending in a direction intersecting the flow direction of the leakage fluid from the base portion. The sealing device for a power generation turbine according to Claim 1.

3. The porous structure (300) is characterized in that a plurality of pores are irregularly formed, and the leakage fluid is introduced toward the pores. The sealing device for a power generation turbine according to Claim 2.

4. The porous structure (300) is manufactured based on a metal in which one or more selected from the group consisting of copper, nickel, aluminum, molybdenum, silver, platinum, gold, magnesium, tin, tungsten, cobalt, titanium, and iron are mixed. The sealing device for a power generation turbine according to Claim 2.

5. The porous structure (300) is arranged at the rear end of at least one or more protruding portions. The sealing device for a power generation turbine according to Claim 2.

6. The sealing device further comprises a support member (400) provided to support one or more positions selected from the front and rear of the porous structure in order to fix the porous structure (300) to the base portion. The sealing device for a power generation turbine according to Claim 2.

7. The porous structure (300) is formed such that the end portion of the free end of the porous structure protrudes more than the end portion of the free end of the support member. The sealing device for a power generation turbine according to Claim 6.

8. The porous structure (300) is characterized in that the end portion of the free end of the porous structure is arranged at a predetermined distance from the rotating body. The sealing device for a power generation turbine according to Claim 2.

9. The porous structure (300) The sealing device for a power generation turbine according to claim 2, wherein an end portion of the free end of the porous structure is arranged to contact the rotating body and is made of a material deformable when an external force is applied.

10. The porous structure (300) The sealing device for a power generation turbine according to claim 6, wherein the porous structure is press-fixed to the support member, and the porosity of the area pressed by the support member is lower than or equal to the porosity of the area not pressed by the support member.

11. The support member (400) includes a support body (410) having one end fastened to the base portion, an end portion of the free end extending toward the rotating body, and accommodating a part of the porous structure. The support body (410) The sealing device for a power generation turbine according to claim 6, further including a tapered portion (411) formed along the inner wall of the support body in a direction in which the thickness of the end portion of the free end of the support member becomes thinner downward.

12. The support member (400) The sealing device for a power generation turbine according to claim 11, further including a buffer space portion (420) formed between the inner wall of the support body and the porous structure so that the porous structure can be deformed when an external force is applied to the porous structure.

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