Sealing devices for power generation turbines

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 uses a porous structure to significantly reduce the amount of leakage fluid flowing between a rotating body having a rotor of the power generation turbine and a stationary body having a casing. [Background technology]

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

[0003] In other words, a turbo-type machine with multiple blades or vanes attached to the circumference of a rotating body and ejecting steam or gas to rotate it at high speed is called a turbine. As industrial power generation has increased, turbines such as steam turbines and gas turbines have gradually become larger and operate at higher pressures.

[0004] In such turbines, steam leakage occurring at the sealing portion between the rotor and the stator is a major factor in reducing turbine efficiency and increasing fuel costs, so sealing technology to reduce steam leakage, i.e., sealing device design technology, is very important.

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

[0006] FIG. 1 is a cross-sectional view showing a state in which a conventional sealing device is mounted on a turbine.

[0007] As shown in FIG. 1, a typical sealing device 5 is provided on the outer and inner rings of a partition wall 3 attached to a casing 2 .

[0008] FIG. 2 is a cross-sectional view showing a typical labyrinth seal device.

[0009] As shown in FIG. 2, the seal device 5 is a labyrinth type with sharp teeth 6, which is widely used as a non-contact annular sealing device for turbines, and reduces the leakage flow rate by utilizing the throttling process of the fluid flowing within the turbine. The teeth 6 are arranged sequentially on the stator, and the pressure drop effect that occurs during the process of the fluid repeatedly throttling and expanding reduces the leakage flow rate of the fluid.

[0010] However, when the space is sealed using the labyrinth-type sealing device 5, the efficiency loss caused by the fluid leaking from the gap between the rotor 1 and the sealing device 5 accounts for more than 33% of the total turbine efficiency loss.

[0011] This reduces the gap between the sealing device 5 and the rotor 1, thereby reducing the loss due to steam leakage. However, if the gap is reduced due to distortion caused by vibration or thermal imbalance of the rotor 1, the sealing device 5 and the rotor 1 come into contact with each other, causing rubbing, which causes the teeth 6 of the sealing device 5 to wear, resulting in a decrease in sealing performance over time.

[0012] That is, since a relatively large vibration may occur during startup compared to normal operation, the gap between the rotor 1 and the sealing device 5 must be a certain distance or more. However, as the gap between the sealing device 5 and the rotor 1 becomes larger, the amount of fluid leakage increases, reducing the sealing effect and further increasing the loss of efficiency of the turbine.

[0013] To solve these problems, a brush-type seal device has been proposed, which includes a brush made of an alloy containing nickel, chromium, tungsten, and molybdenum and is made of a wire having a thickness similar to that of a human hair. However, the high cost of the brush and the complicated manufacturing process still pose a problem of significantly increasing the manufacturing cost of the brush-type seal device. [Prior art documents] [Patent documents]

[0014] [Patent Document 1] Korean Patent Registration No. 10-1695107 Summary of the Invention [Problem to be solved by the invention]

[0015] The present invention has been devised to solve the above-mentioned problems, and more specifically, an object of the present invention is to provide a sealing device for a power generation turbine that can significantly reduce the amount of fluid leakage, thereby reducing turbine efficiency loss, and significantly reduce manufacturing costs, compared to conventional turbine sealing devices. [Means for solving the problem]

[0016] A sealing device for a power generation turbine according to one embodiment of the present invention is a sealing device that reduces the flow rate of leakage fluid flowing between a rotating body and a fixed body of a power generation turbine, and is characterized in that the sealing device includes a base that is connected to the fixed body, and at least one protrusion that is formed on the base and extends from the base toward the rotating body, maintaining an end of the free end out of contact with the rotating body and reducing the flow rate of the leakage fluid.

[0017] More specifically, the sealing device further includes at least one porous structure detachably connected to the base and extending from the base in a direction intersecting the flow direction of the leakage fluid.

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

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

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

[0021] More specifically, the sealing device may further include a support member configured 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 characterized in that the free end of the porous structure is formed to protrude beyond the free end of the support member.

[0023] More specifically, the porous structure is characterized in that the free end of the porous structure is spaced a predetermined distance from the rotor.

[0024] More specifically, the porous structure is arranged so that a free end of the porous structure contacts the rotor, and is made of a material that is deformable when an external force is applied.

[0025] More specifically, the porous structure is pressed and 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.

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

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

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

[0029] A sealing device for a power generation turbine according to one embodiment of the present invention can disperse the flow path of the fluid through a porous structure, thereby reducing the amount of fluid leakage and increasing the power generation efficiency of the power generation turbine.

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

[0031] In a sealing device for a power generation turbine according to one embodiment of the present invention, the porous structure is manufactured using an alloy containing a mixture of at least one metal selected from the group consisting of copper, nickel, aluminum, molybdenum, silver, platinum, gold, magnesium, tin, tungsten, cobalt, titanium, and iron, which prevents damage and distortion even in the high-temperature, high-pressure environment inside an operating power generation turbine, thereby ensuring improved operational reliability.

[0032] A sealing device for a power generation turbine according to one embodiment of the present invention is arranged behind one or more protrusions when the porous structure is arranged, so that the porous structure is not initially exposed to high-temperature, high-pressure gas, thereby minimizing displacement and distortion of the porous structure due to the gas.

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

[0034] In one embodiment of the present invention, the sealing device for a power generation turbine has an end portion of the free end of the porous structure protruding beyond the end portion of the free end of the support member, thereby minimizing contact between the support member and the rotating body and preventing damage to the support member and displacement of the porous structure that may occur due to contact between the support member and the rotating body, thereby ensuring improved reliability.

[0035] In a sealing device for a power generation turbine according to one embodiment of the present invention, the free end of the porous structure is positioned away from the rotating body, thereby minimizing wear that may occur due to friction between the porous structure and the rotating body and extending the life of the porous structure.

[0036] A sealing device for a power generation turbine according to one embodiment of the present invention can further improve fluid blocking performance by bringing a porous structure into contact with a rotating body, and can prevent damage to the porous structure that may occur when it comes into contact with the rotating body because the porous structure is deformable.

[0037] The sealing device for a power generation turbine according to one embodiment of the present invention is designed to have a low porosity in the portion that is pressed and fixed by the support member, thereby further improving the fluid blocking performance based on the low porosity.

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

[0039] A sealing device for a power generation turbine according to an additional embodiment of the present invention can minimize damage to the power generation turbine by forming a buffer space portion, thereby securing a space in which the porous structure can deform and absorb the impact when the porous structure is subjected to an impact due to contact with a rotor. [Brief explanation of the drawings]

[0040] [Figure 1] FIG. 1 is a cross-sectional view showing a state in which a conventional seal device is mounted on a turbine. [Figure 2] FIG. 1 is a cross-sectional view showing a conventional labyrinth seal device. [Figure 3] 1 is a diagram illustrating a state in which a sealing device for a power generation turbine according to an embodiment of the present invention is applied to a power generation turbine; [Figure 4] 1 is a perspective view of a sealing arrangement for a power generation turbine according to one embodiment of the present invention; [Figure 5] FIG. 5 is an enlarged view of area A of FIG. 4 as viewed from above. [Figure 6]5 is an enlarged view of area A of FIG. 4 as viewed from below. [Figure 7] 1 is a cross-sectional view of a sealing arrangement for a power generation turbine according to one embodiment of the present invention; [Figure 8] 4 is a cross-sectional view of a seal arrangement for a power generation turbine according to another embodiment of the present invention. [Figure 9] 10 is a cross-sectional view showing a state in which a porous structure and a support member that constitute a sealing device for a power generation turbine according to an additional first embodiment of the present invention are joined together. FIG. [Figure 10] FIG. 10 is a cross-sectional view showing a state in which a porous structure and a support member that constitute a sealing device for a power generation turbine according to an additional second embodiment of the present invention are joined together. [Figure 11] FIG. 10 is a cross-sectional view showing a state in which a porous structure and a support member that constitute a sealing device for a power generation turbine according to an additional third embodiment of the present invention are joined together. [Figure 12] FIG. 10 is a cross-sectional view showing a state in which a porous structure and a support member that constitute a sealing device for a power generation turbine according to another embodiment of the additional third embodiment of the present invention are joined together. [Figure 13] FIG. 10 is a cross-sectional view showing a state in which a porous structure and a support member that constitute a sealing device for a power generation turbine according to an additional fourth embodiment of the present invention are joined together. [Figure 14] FIG. 10 is a cross-sectional view showing a state in which a porous structure and a support member that constitute a sealing device for a power generation turbine according to another embodiment of the additional fourth embodiment of the present invention are joined together. DETAILED DESCRIPTION OF THE INVENTION

[0041] The advantages and features of the present invention, as well as the manner in which they are achieved, will become apparent from the detailed description of the embodiments taken in conjunction with the accompanying drawings.

[0042] However, the present invention is not limited to the embodiments disclosed below, and may be embodied in various different forms. These embodiments are provided only to complete the disclosure of the present invention and to fully convey the scope of the invention to those skilled in the art to which the present invention pertains. The present invention is defined only by the scope of the claims.

[0043] Furthermore, the terms used in this specification are intended to describe the embodiments and are not intended to limit the present invention.

[0044] In this specification, the singular includes the plural unless otherwise specified. As used in the specification, the words "comprises" and / or "comprising" do not exclude the presence or addition of other elements other than the elements listed.

[0045] Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used in a manner commonly understood by those of ordinary skill in the art to which this invention belongs.

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

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

[0048] As shown in Figure 3, the power generation turbine may include a rotating body 10 having a rotor 11 and blades 12 of the power generation turbine, a fixed body 20 having a casing of the power generation turbine, and a partition wall 30 fastened to the fixed body 20 and formed extending toward the blades and rotor.

[0049] In this case, the partition wall 30 is configured to be coupled to the sealing device 1000 for the power generating turbine, and may include a first coupling portion 32a formed at a position adjacent to the axis of the rotor 11 and a second coupling portion 32b formed at a position adjacent to the blade 12.

[0050] It should be noted that the installation position of the sealing device 1000 for a power generation turbine is not limited, and it is desirable to understand that it can be installed in any location where sealing is required between the rotating rotor 10 and the fixed rotor 20, and can be installed on the path of leakage fluid FL that leaks without penetrating the blades to reduce the flow rate of the leakage fluid FL.

[0051] As shown by the arrows in FIG. 3, most of the steam or gas flowing into the fixed body 20 passes through the fixed partition 31, causing the blades 12 extending from the side of the rotor 11 to rotate, and is then guided by the partition 31 to the next blade 12, causing it to rotate, and is finally discharged to the outside.

[0052] In this process, when each of the blades 12 rotates, the rotor 10 having the blades 12 rotates, generating electricity.

[0053] At this time, it is preferable that the first and second coupling portions 32a and 32b are formed along the outer periphery of the partition wall 30 so that the sealing device 1000 can be fixed thereto, and stepped portions protruding along the outer periphery of the sealing device 1000 are formed to correspond to the shapes of the coupling portions described above and are fitted and fixed to the coupling portions.

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

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

[0056] First, the sealing device for a power generation turbine is provided to reduce the amount of leakage fluid flowing between the rotating body and the stationary body of the power generation turbine.

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

[0058] First, the base 100 is connected to the fixed body to form a ring shape, and may have a step portion having a predetermined shape at the upper end for fastening to the fixed body.

[0059] In this case, the base 100 may be divided into a plurality of pieces for smooth fastening to the fixed body, and when the plurality of divided bases 100 are all fastened to the fixed body, the combined state of the bases is arranged to have a ring shape.

[0060] In addition, the protrusion 200 is formed on the base 100 to reduce the flow rate of the leakage fluid, and at least one protrusion 200 is provided so as to extend toward the rotating body when the base 100 is fastened to the fixed body.

[0061] In particular, the protrusion 200 is provided so that the free end portion is kept out of contact with the rotating body.

[0062] In addition, by forming a protrusion that reduces the amount of fluid flow without coming into direct contact with the rotating body, the flow path of the fluid can be changed, making it possible to reduce the amount of fluid leakage without interfering with the rotation of the rotating body.

[0063] At this time, the protrusion 200 may be formed by being processed together with the base 100 when the base 100 is processed, or may be separately processed after the base 100 is processed so as to be fastened to the base 100.

[0064] Next, the porous structure 300 is intended to reduce the amount of leakage of the leaking fluid by dispersing the flow paths of the leaking fluid, and may be made of a metal material and include a metal foam having a large number of pores.

[0065] Metal foam means a foam made of metal, and refers to a material made of metal material with irregular pores formed inside. It is preferable that the metal foam does not react when it comes into contact with the inflowing fluid, and has corrosion resistance and durability.

[0066] The metal foam is formed by forming metal in the form of thin wires and randomly intertwining them to form pores, which provide structural compensation and provide the overall appropriate softness and elasticity.

[0067] In the present application, the porous structure 300 means that it contains at least one metal as a main component.

[0068] Here, "containing 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 metal skeleton. The upper limit of the proportion of the metal contained as the main component is not particularly limited, and may be, for example, 100% by weight.

[0069] The porous structure 300 may be manufactured based on a metal mixture of 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 made of an alloy containing a mixture of one or more metals selected from the group consisting of copper, nickel, aluminum, molybdenum, silver, platinum, gold, magnesium, tin, tungsten, cobalt, titanium, and iron, which prevents damage and distortion even under the high temperature and high pressure environment inside an operating power generation turbine, thereby ensuring improved operational reliability.

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

[0072] In particular, the irregularly formed pores can disperse the flow paths of the leaking fluid and significantly reduce the flow rate, thereby reducing the amount of fluid leakage over the same period of time and increasing the power generation efficiency of the power turbine.

[0073] Meanwhile, the porous structure 300 may be provided to have a porosity of 10% to 90%. If the porosity is less than 10%, there is a problem that the durability of the porous structure is reduced, and if the porosity is more than 90%, there is a problem that the flow resistance of the porous structure 300 against the leaking fluid cannot be increased to a degree that reduces the amount of leakage of the leaking fluid, so the above-mentioned range is satisfied.

[0074] Furthermore, various scales, which are fine particles of residue generated during the operation of the power generating turbine, can be collected through the pores formed in the porous structure 300 .

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

[0076] That is, the flow resistance to the leaking fluid can be increased due to the reduction in the porosity of the porous structure 300 over the course of use.

[0077] In addition, when the power generating turbine is in operation, foreign matter that may be generated inside the casing may be scattered by the high-pressure fluid and cause damage to various components that make up the power generating turbine. However, by capturing and filtering the foreign matter through the porous structure 300, the scattering of the foreign matter can be minimized, and damage to the power generating turbine components can also be reduced.

[0078] In addition, at least one of the porous structures 300 may be fastened to the base 100 .

[0079] At this time, the porous structure 300 and the base 100 may be fastened together by a form-fitting method, and a receiving groove for receiving the porous structure 300 may be formed in the base 100.

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

[0081] In addition, the porous structure 300 may be formed to extend in the same direction as the extension direction of the protrusion 200 and may be disposed to restrict the flow of leaking fluid.

[0082] The porous structure 300 is disposed behind at least one protrusion.

[0083] In particular, the porous structure 300 may be disposed behind one or more of the protrusions 200 .

[0084] This prevents the porous structure 300 from being exposed to high-temperature, high-pressure gas initially, thereby minimizing displacement and distortion of the porous structure 300 due to the gas.

[0085] In addition, the porous structure 300 may be arranged such that the free end is spaced a predetermined distance from the rotor.

[0086] This minimizes wear that may occur due to friction between the porous structure 300 and the rotating body, thereby extending the service life of the porous structure 300.

[0087] Meanwhile, although not specifically shown in the drawings, the porous structure 300 may be formed in a sheet or block shape, and a plurality of the porous structures 300 may be fastened to the base 300 in an overlapping state.

[0088] Furthermore, after compressing at least one of the porous structures 300, the compressed porous structure 300 can be fastened to the base 300, and it goes without saying that multiple compressed porous structures 300 can be fastened to the base 300 in an overlapping state.

[0089] At this time, when the porous structure 300 is compressed, the compression may be performed in the thickness direction of the porous structure, but the compression direction is not limited thereto.

[0090] In this way, by arranging multiple porous structures 300 in multiple stages or compressing the porous structure 300, the porosity of the porous structure 300 can be reduced, thereby further improving the fluid blocking rate.

[0091] The sealing device for a power generation turbine according to one embodiment of the present invention may further include a support member 400 .

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

[0093] In particular, the support member 400 is provided to support at least one selected position from the front and rear of the porous structure.

[0094] That is, the support member 400 allows the shape of the porous structure to be maintained and the porous structure to be more firmly fixed to the base, thereby ensuring improved durability and operational reliability.

[0095] Meanwhile, the porous structure 300 is formed such that when combined with the support member 400, the free end of the porous structure protrudes beyond the free end of the support member.

[0096] More specifically, the free end of the porous structure 300 protrudes beyond the free end of the support member 400, thereby minimizing contact between the support member 400 and the rotating body 10.

[0097] In addition, it is possible to prevent damage to the support member 400 and displacement of the porous structure 300 that may occur when the support member 400 and the rotating body 10 come into contact with each other, thereby ensuring improved reliability.

[0098] The porous structure 300 is pressed against the support member 400 to be fixed in position.

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

[0100] That is, when designing the porous structure 300, the porosity of the portion pressed and fixed by the support member 400 is designed to be low, thereby further improving the fluid blocking performance based on the low porosity.

[0101] Referring now to FIG. 8, a sealing arrangement 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 sealing assembly 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 disposed so that the free end of the porous structure 300 contacts the rotating body 10 .

[0104] In this case, the porous structure 300 may be made of a flexible material that can be deformed when an external force is applied.

[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 is deformable, damage to the porous structure 300 that may occur when it comes into contact with the rotating body 100 can be prevented.

[0106] 9-12, a sealing arrangement for a power generation turbine according to an additional embodiment of the present invention will now 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 that constitute a sealing device for a power generation turbine according to an additional first embodiment of the present invention are joined together.

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

[0109] First, the support 410 has one end fastened to the base 100 and a free end extending toward the rotor, thereby accommodating a portion of the porous structure.

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

[0111] In particular, by forming the tapered portion 411, the area where the porosity gradually decreases can be further expanded, thereby further improving the fluid blocking performance due to the expansion of the porosity decreasing area.

[0112] In this case, the porous structure 300 may include a first area A1, which is an area where one side of the porous structure 300 abuts the tapered portion 411 when no external force is applied to the porous structure, and a second area A2, which is an area where one side of the porous structure 300 is spaced a predetermined distance from the tapered portion 411.

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

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

[0115] In this case, the support 410 may 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 may be formed on the end side of one of a pair of opposing free ends selected from the free ends.

[0116] In particular, by forming the buffer space portion 420, when the porous structure 300 is subjected to an impact due to contact with the rotor 100, the porous structure 300 can be deformed to secure a space that can absorb the impact, thereby minimizing damage to the power generation turbine.

[0117] Next, with reference to FIG. 10, a sealing 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 sealing device for a power generation turbine according to a second additional embodiment of the present invention are joined together.

[0119] As shown in FIG. 10, the support 410 may 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 may be formed on both sides of a pair of opposing free ends.

[0120] In this case, the porous structure 300 may include a third area A3, which is an area where both sides of the porous structure 300 abut against the tapered portion 411 when no external force is applied to the porous structure, and a fourth area A4, which is an area where both sides of the porous structure 300 are spaced a predetermined distance from the tapered portion 411.

[0121] Here, the porosity of the third area A3 may be formed to be lower or equal to the porosity of the fourth area A4, and the porous structure 300 may be combined with the support member 400 so that the porosity of the third area A3 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, so that even if an impact is applied to the porous structure 300 by the rotating body, not only can damage to the rotating body be prevented, but also damage to the porous structure 300 can be prevented.

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

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

[0125] As shown in FIG. 11, the support 410 may 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 may be formed on both sides of the ends of a pair of free ends facing each other.

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

[0127] In this case, the porous structure 300 may include a fifth area A5, which is an area where both sides of the porous structure 300 when no external force is applied thereto are connected to the inner walls 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 may be formed to be lower or equal to the porosity of the sixth area A6, and the porous structure 300 may be combined with the support member 400 so that the porosity of the fifth area A5 gradually decreases in the direction of the sixth area A6.

[0129] In particular, by forming at least one bending point 412, the support 410 applies stronger pressure to the upper end area of the bending point 412, thereby improving the bonding force, and the support 410 expands its storage space in the lower end area of the bending point 412, allowing the porous structure 300 to store a larger amount of leaked fluid, thereby ensuring significantly improved fluid blocking performance.

[0130] 12, the tapered portion 411, the bending point 412, and the buffer space portion 420 may be formed on both inner side walls of the support 410 with the porous structure 300 at the center, and it goes without saying that the formation area of the porous structure 300 can be expanded by the above-mentioned structure.

[0131] 13 and 14, a sealing arrangement for a power generation turbine according to a fourth additional embodiment of the present invention will now be described in more detail.

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

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

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

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

[0136] While the present invention has been described above with reference to the embodiments shown in the drawings, this is for illustrative purposes only, and a person having ordinary skill in the art to which the present invention pertains will understand from the detailed description of the invention that various modifications or equivalent embodiments are possible.

[0137] Therefore, the true scope of the present invention must be determined by the technical ideas of the claims. [Explanation of symbols]

[0138] 1, 10 Rotating body 2, 20 casing 3, 30 bulkhead 5 Sealing device 6 teeth 31a, 31b Receiving groove 40a, 40b blades FL Leaking fluid 100 base 200 Protrusion 300 porous structure 400 Support member 410 Support 411 Tapered section 412 Bending point 420 Buffer space

Claims

1. A sealing device that reduces the amount of leakage fluid flowing between a rotating body and a stationary body of a power generation turbine, comprising: The sealing device is a base (100) coupled to the fixed body; At least one protrusion (200) formed on the base, extending from the base toward the rotating body, maintaining a state in which an end of a free end does not contact the rotating body and reducing the flow rate of the leakage fluid; a porous structure (300) detachably coupled to the base, extending rearward of the protrusion in a direction intersecting the flow direction of the leakage fluid, and having a plurality of irregular pores; A support member (400) that accommodates at least a portion of the porous structure, the support member (410) having one end fastened to the base, a free end extending toward the rotating body, and an inner wall having a tapered portion (411) whose thickness gradually decreases downward; a buffer space (420) formed between the inner wall of the support and the porous structure, which allows the porous structure to deform when an external force is applied to the porous structure; Including, The free end of the porous structure protrudes from the free end of the support member, and is elastically deformed when an external force is applied, so that it can come into contact with the rotating body.

1. A sealing arrangement for a power generation turbine, comprising:

2. The porous structure (300) comprises:

2. The sealing device for a power generation turbine according to claim 1, wherein a plurality of pores are formed irregularly, and the sealing device is provided so that leakage fluid is introduced toward the pores.

3. The porous structure (300) comprises:

2. The sealing device for a power generation turbine according to claim 1, characterized in that it is manufactured based on a metal mixture of one or more selected from the group consisting of copper, nickel, aluminum, molybdenum, silver, platinum, gold, magnesium, tin, tungsten, cobalt, titanium and iron.

4. The porous structure (300) comprises: A sealing device for a power generation turbine according to any one of claims 1 to 3, characterized in that the porosity of an area that is pressed and fixed to the support member and that is pressed by the support member is lower than or equal to the porosity of an area that is not pressed by the support member.

5. The porous structure (300) comprises:

2. The sealing device for a power generation turbine according to claim 1, wherein an end of the free end of the porous structure is positioned a predetermined distance away from the rotating body.

6. 2. The sealing device for a power generation turbine according to claim 1, wherein the porous structure elastically deforms when an external force is applied, and is capable of blocking leakage fluid while in contact with the rotating body.

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