Gas turbine and sealing structure thereof

Abstract

The invention discloses a gas turbine and a sealing structure thereof, the gas turbine comprises a rotor, a stator, a sealing assembly, a sliding part and a driving part, and the rotor has a radial direction and an axial direction; the stator surrounds the outer peripheral side of the rotor, and an assembling groove is formed in the inner peripheral wall of the stator; the sealing assembly is assembled in the assembling groove and can be adjusted in a sliding mode in the radial direction relative to the stator. The sealing assembly is used for conducting clearance sealing with the peripheral wall of the rotor and is provided with a guiding face. The sliding piece is arranged in the assembling groove and can be adjusted in a sliding mode relative to the stator in the axial direction, and the sliding piece is used for generating displacement for driving the sealing assembly to move and approach the rotor through abutting fit with the guiding face during sliding; the driving piece is arranged in the assembling groove and used for driving the sliding piece to slide in the axial direction. According to the sealing structure, the adjustment of the sealing assembly in the radial position can be achieved, so that the adjustment of the size of the sealing gap can be achieved, the situation of sealing failure easily caused by frictional wear and the like is avoided, and the service life of the sealing structure is also prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of gas turbines, and in particular, to a sealing structure for a gas turbine and a gas turbine. Background Art

[0002] In order to prevent the gas in the mainstream channel from invading the inside of the disk chamber and ensure the efficient operation of the gas turbine, the gas turbine needs to seal the inter-stage of the disk. Currently, the common sealing forms include labyrinth seal, honeycomb seal, brush seal, etc.

[0003] Among them, the labyrinth seal and the honeycomb seal mainly inhibit gas leakage through the tiny sealing gaps formed by the labyrinth teeth or the honeycomb and the outer wheel of the rotor. In actual use, due to vibration, gravity, etc., the rotor will produce a certain amount of deflection deformation, which will cause frictional wear on the sealing surface, making it easy for the labyrinth seal and the honeycomb seal to fail in sealing.

[0004] The brush seal can improve the sealing failure problem caused by deflection deformation to a certain extent due to its good sealing characteristics and flexibility. However, in actual use, there is still a problem of frictional wear at the tip of the brush wire. When the frictional wear is severe, there is still a problem of sealing failure, which shortens the service life of the brush seal. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems in the related art to some extent.

[0006] To this end, an embodiment of the present invention provides a sealing structure, which can realize the adjustment of the radial position of the sealing component, thereby realizing the adjustment of the size of the sealing gap, avoiding the situation of sealing failure easily caused by frictional wear, etc., and also extending the service life of the sealing structure.

[0007] An embodiment of the present invention further provides a gas turbine including the above sealing structure.

[0008] The sealing structure of the embodiment of the present invention includes:

[0009] A rotor, the rotor having a radial direction and an axial direction;

[0010] A stator, the stator surrounding the outer peripheral side of the rotor, and an assembly groove being provided on the inner peripheral wall of the stator;

[0011] A sealing component, the sealing component being assembled in the assembly groove and being slidably adjustable along the radial direction relative to the stator, the sealing component being used for gap sealing with the outer peripheral wall of the rotor and being provided with a guiding surface;

[0012] A sliding member, the sliding member is arranged in the assembly groove and can be slidably adjusted along the axial direction relative to the stator, and the sliding member is used to generate a displacement that drives the sealing assembly to move closer to the rotor through a stop fit with the guide surface during sliding;

[0013] A driving member is disposed in the assembly groove and is used to drive the sliding member to slide along the axial direction.

[0014] In some embodiments, the driving member is temperature-sensitive and can be deformed as the temperature changes, and the driving member is used to push the sliding member to slide along the axial direction when deformed.

[0015] In some embodiments, the driving member comprises:

[0016] an elastic body, the elastic body being used for releasing elastic potential energy to push the sliding member to slide along the axial direction;

[0017] A fixing agent, wherein the fixing agent has a first form and a second form as the temperature changes. In the first form, the fixing agent is used to fix the elastomer to suppress the release of the elastic potential energy of the elastomer. In the second form, the fixing agent releases the suppression of the elastomer to release the elastic potential energy of the elastomer.

[0018] In some embodiments, the first state is solid, the second state is liquid or gas, and the fixative can be liquefied or vaporized as the temperature increases so that the fixative can switch from the first state to the second state.

[0019] In some embodiments, the material of the elastomer is a nickel-based high temperature resistant alloy;

[0020] And / or, the fixing agent is made of acrylic resin, epoxy resin and silica filler;

[0021] And / or, the cross section of the elastic body is wavy.

[0022] In some embodiments, a heating element is included, and the heating element is disposed on the stator, and the heating element is used to heat the fixing agent to switch the fixing agent from the first state to the second state.

[0023] In some embodiments, the sliding member is provided with a mating surface, the mating surface and the guiding surface are both inclined surfaces, the guiding surface is provided at the end of the sealing assembly away from the rotor, and the mating surface and the guiding surface are arranged opposite to each other and in close contact in the radial direction.

[0024] In some embodiments, the sealing assembly includes a first baffle, a second baffle and a sealing sheet;

[0025] At least one of the first baffle and the second baffle is in sliding fit with the stator in the radial direction, and the first baffle and the second baffle are arranged opposite to each other in the axial direction. The sealing sheet is clamped between the first baffle and the second baffle in the axial direction. The guiding surface is arranged on the first baffle, the second baffle and the sealing sheet, and the sealing sheet is used for clearance sealing with the outer peripheral wall of the rotor.

[0026] In some embodiments, the first baffle is provided with a first hole penetrating the first baffle along the axial direction, the sealing sheet is provided with a second hole penetrating the sealing sheet along the axial direction, the second baffle is provided with a balance cavity, the balance cavity is located between the sealing sheet and the second baffle, and the first hole, the second hole and the balance cavity are communicated;

[0027] And / or, the assembly groove extends circumferentially along the stator to form a closed circle, or there are a plurality of assembly grooves, and the plurality of assembly grooves are arranged at intervals along the circumferential direction of the stator;

[0028] And / or, there are a plurality of sealing assemblies, and the plurality of sealing assemblies are arranged at intervals along the circumferential direction of the stator;

[0029] And / or, there are a plurality of sealing sheets, and the plurality of sealing sheets are stacked in the axial direction.

[0030] The gas turbine according to an embodiment of the present invention includes the sealing structure as described in any one of the above embodiments.

[0031] Beneficial effects: The sealing structure and the gas turbine according to the embodiments of the present invention. The sealing structure can realize the adjustment of the radial position of the sealing assembly, so as to realize the adjustment of the size of the sealing gap, avoid the situation of sealing failure easily caused by friction and wear, etc., and also extend the service life of the sealing structure. Description of the Drawings

[0032] Figure 1 It is a schematic diagram of the sealing structure according to an embodiment of the present invention.

[0033] Figure 2 It is a schematic diagram of the structure of the driving member according to an embodiment of the present invention.

[0034] Figure 3 It is a schematic diagram of the sealing structure according to another embodiment of the present invention.

[0035] Reference Signs:

[0036] 1 - Rotor;

[0037] 2 - Stator;

[0038] 3 - Sealing assembly; 31 - Guide surface; 32 - First baffle; 321 - First hole; 33 - Second baffle; 331 - Balance cavity; 34 - Sealing piece; 341 - Second hole;

[0039] 4 - Sliding part; 41 - Fitting surface;

[0040] 5 - Driving part; 51 - Elastomer; 52 - Fixing agent;

[0041] 6 - Heating part. Specific embodiments

[0042] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0043] As Figure 1 shown, the sealing structure of the embodiment of the present invention includes a rotor 1, a stator 2, a sealing assembly 3, a sliding part 4 and a driving part 5.

[0044] The rotor 1 has a radial direction and an axial direction. For example, the rotor 1 can be in the shape of a circular shaft. The axial direction of the rotor 1 can be the left - right direction, and the radial direction of the rotor 1 is the radial direction of the rotor 1.

[0045] The stator 2 surrounds the outer peripheral side of the rotor 1, and an assembly groove is provided on the inner peripheral wall of the stator 2. For example, as Figure 1 shown, the stator 2 can be a stator casing. The stator 2 can be integrally in a circular ring shape and can be coaxially arranged with the rotor 1, and the stator 2 can integrally surround the outer peripheral side of the rotor 1 and be spaced apart from the rotor 1 in the radial direction.

[0046] The inner peripheral wall of the stator 2 is the surface of the stator 2 facing the rotor 1, and an assembly groove is provided on the inner peripheral wall of the stator 2. The assembly groove can extend along the circumferential direction of the stator 2 to form a closed loop. In some other embodiments, there can also be multiple assembly grooves, and the multiple assembly grooves are arranged at intervals along the circumferential direction of the stator 2.

[0047] The sealing assembly 3 is assembled in the assembly groove and can be adjusted slidably along the radial direction relative to the stator 2. The sealing assembly 3 is used for clearance sealing with the outer peripheral wall of the rotor 1 and is provided with a guide surface 31.

[0048] For example, as Figure 1As shown, the sealing assembly 3 can be a modular structure. The sealing assembly 3 as a whole can be fan-shaped and there can be multiple of them. The multiple sealing assemblies 3 can be arranged sequentially along the circumference of the stator 2 and generally form an annular structure by splicing. When the assembly groove is a single annular groove, the outer sides of the multiple sealing assemblies 3 can all be slidably assembled in the assembly groove of the stator 2, and each sealing assembly 3 can slide relative to the stator 2 along the above-mentioned radial direction. When there are multiple assembly grooves, the multiple sealing assemblies 3 can be slidably assembled in the multiple assembly grooves one by one.

[0049] It should be noted that in the radial direction of the rotor 1, the sealing assembly 3 has an inner end facing the rotor 1 and an outer end facing the stator 2. Among them, the inner end of the sealing assembly 3 has a certain flexibility, and the inner end of the sealing assembly 3 can be in fit and abutment with the outer peripheral wall of the rotor 1, so as to realize the clearance sealing between the rotor 1 and the sealing assembly 3. The guiding surface 31 can be an inclined surface, and the guiding surface 31 can be arranged at the outer end of the sealing assembly 3. For example, as Figure 1 shown, the guiding surface 31 can be arranged to incline upward along the direction from left to right.

[0050] The sliding member 4 is arranged in the assembly groove and is axially slidably adjustable relative to the stator 2, and the sliding member 4 is used to generate a displacement that drives the sealing assembly 3 to move closer to the rotor 1 when sliding through the abutting fit with the guiding surface 31. The driving member 5 is arranged in the assembly groove and is used to drive the sliding member 4 to slide axially.

[0051] For example, as Figure 1 shown, the sliding member 4 can be a block structure, and the sliding member 4 can be slidably assembled in the above-mentioned assembly groove along the left-right direction. Specifically, the sliding member 4 can be assembled between the stator 2 and the above-mentioned guiding surface 31. The above-mentioned driving member 5 can be an elastic member or other components that can drive the sliding member 4 to slide in the left-right direction. As Figure 1 shown, the driving member 5 can be arranged on the left side of the sliding member 4.

[0052] In use, the driving member 5 can drive the sliding member 4 to move to the right. The sliding member 4 moving to the right will be inserted between the stator 2 and the guiding surface 31 like a wedge. Since the stator 2 can be regarded as having an unadjustable position, at this time, the sealing assembly 3 will generate a displacement closer to the rotor 1 under the action of the sliding member 4. Thus, the gap between the sealing assembly 3 and the rotor 1 will become smaller, so as to realize the adjustment of the size of the sealing gap and ensure the airtightness between stages.

[0053] In the sealing structure of the embodiment of the present invention, the sealing assembly 3 of the sealing structure can realize the autonomous adjustment of the radial position, avoiding the situation that the sealing gap is relatively large and the sealing fails due to friction and wear, etc., and prolonging the overall service life of the sealing structure.

[0054] Secondly, since there is a driving member 5 dedicated to driving the sliding member 4 to slide, adjustment can be achieved without manually removing components such as the casing of the gas turbine during adjustment, which also improves the convenience of operation.

[0055] In some embodiments, the driving member 5 is temperature-sensitive and deformable with the change of temperature, and the driving member 5 is used to push the sliding member 4 to slide axially when deformed.

[0056] For example, the material of the driving member 5 can be shape memory alloy or the like. When the external environmental temperature changes, the shape of the driving member 5 itself will change. Through this shape change, the sliding member 4 can be pushed to the right, thereby meeting the use requirement of driving the sealing assembly 3 to perform radial position adjustment.

[0057] In some embodiments, the driving member 5 includes an elastic body 51 and a fixing agent 52. The elastic body 51 is used to release elastic potential energy to push the sliding member 4 to slide axially. The fixing agent 52 has a first form and a second form with the change of temperature. In the first form, the fixing agent 52 is used to fix the elastic body 51 to inhibit the release of the elastic potential energy of the elastic body 51. In the second form, the fixing agent 52 releases the inhibition of the elastic body 51 to enable the release of the elastic potential energy of the elastic body 51.

[0058] For example, as Figure 2 shown, the elastic body 51 can be a structural member such as a spring. During assembly, the elastic body 51 can store elastic potential energy through compression or the like. The fixing agent 52 can be acrylic resin or the like. In some other embodiments, the fixing agent 52 can also be other materials such as epoxy resin and silica filler.

[0059] When the temperature is low, the fixing agent 52 can be in a solid form, that is, the fixing agent 52 is in the first form. The solid fixing agent 52 can restrain and fix the elastic body 51, thus avoiding the situation of the elastic body 51 releasing elastic potential energy and realizing the pre-storage of the elastic potential energy of the elastic body 51.

[0060] After the gas turbine operates for a period of time, the environmental temperature where the fixing agent 52 is located will become higher. At this time, the sealing assembly 3 will also be consumed partly due to friction and wear, that is, the gap between the sealing assembly 3 and the rotor 1 will become larger. Due to the increase in the external environmental temperature of the fixing agent 52, the fixing agent 52 will melt or liquefy. At this time, the fixing agent 52 will switch to the second form. And since the elastic body 51 loses the limit inhibition of the fixing agent 52, the elastic potential energy of the elastic body 51 will be released by itself. The sliding member 4 will approach the rotor 1 under the action of the elastic body 51, so that the gap between the sealing assembly 3 and the rotor 1 can be reduced.

[0061] In some embodiments, the first form is solid, the second form is liquid or gas, and the fixing agent 52 can be liquefied or vaporized as the temperature rises so that the fixing agent 52 can switch from the first form to the second form. Thus, it is convenient to limit and fix the elastomer 51 and release the limit, improving the convenience of operation.

[0062] It should be noted that the change in the form of the fixing agent 52 can be in the form of gradual decomposition, that is, as the temperature rises and other changes occur, the state change of the fixing agent 52 proceeds step by step, so that the elastic potential energy of the elastomer 51 can be slowly released.

[0063] In some embodiments, the material of the elastomer 51 is a nickel-based high-temperature alloy. Thus, the elastomer 51 has characteristics such as high temperature resistance and oxidation corrosion resistance, fully meeting the usage requirements.

[0064] In some embodiments, the cross-section of the elastomer 51 is wavy. For example, the elastomer 51 can be strip-shaped, and the elastomer 51 can extend along the circumferential direction of the rotor 1, and as Figure 2 shown, the shape of the cross-section of the elastomer 51 can be wavy, specifically, it can be a W shape. Thus, the elastic effect of the elastomer 51 is fully ensured.

[0065] In some embodiments, the sealing structure includes a heating element 6, the heating element 6 is arranged on the stator 2, and the heating element 6 is used to heat the fixing agent 52 so that the fixing agent 52 switches from the first form to the second form.

[0066] For example, as Figure 3 shown, the heating element 6 can be a heating rod, etc., and the heating element 6 can extend into the fixing agent 52 in the above assembly groove. During use, the fixing agent 52 can be actively heated through the heating element 6, so that the active adjustment and control of the form of the fixing agent 52 can be realized, improving the controllability of the operation.

[0067] It should be noted that during the use of the gas turbine, there are a hot end and a cold end. Among them, the hot end can be regarded as the part with a higher temperature, and the cold end can be regarded as the part with a lower temperature. When the sealing structure is located at the hot end, at this time, an additional heating element 6 does not need to be installed, and the heat of the hot end itself can be used to heat the fixing agent 52 during the operation of the gas turbine.

[0068] When the sealing structure is located at the cold end, at this time, the heating element 6 needs to be installed at the fixing agent 52. Since the heat at the cold end is not sufficient to cause the fixing agent 52 to heat and melt, etc., it is necessary to actively heat the fixing agent 52 with the help of the heating element 6, realizing the linearity of the adjustment.

[0069] In some embodiments, the sliding member 4 is provided with a mating surface 41, and both the mating surface 41 and the guide surface 31 are inclined surfaces. The guide surface 31 is provided at the end of the sealing assembly 3 facing away from the rotor 1, and the mating surface 41 and the guide surface 31 are arranged opposite to each other in the radial direction and in close contact.

[0070] For example, Figure 3 As shown, the mating surface 41 may also be an inclined surface, and the mating surface 41 may also be arranged to be inclined from left to right toward the outside of the stator 2. When the sliding member 4 moves to the right under the action of the driving member 5, under the mutual stop action of the mating surface 41 and the guide surface 31, the extrusion force applied by the sliding member 4 to the sealing assembly 3 will generate a component force toward the rotor 1, thereby facilitating the sealing assembly 3 to move closer to the rotor 1.

[0071] In some embodiments, Figure 3 As shown, the sealing assembly 3 includes a first baffle plate 32 , a second baffle plate 33 and a sealing sheet 34 .

[0072] At least one of the first baffle 32 and the second baffle 33 is radially slidingly matched with the stator 2, and the first baffle 32 and the second baffle 33 are axially arranged opposite to each other, the sealing plate 34 is axially clamped between the first baffle 32 and the second baffle 33, the guide surface 31 is provided on the first baffle 32, the second baffle 33 and the sealing plate 34, and the sealing plate 34 is used to seal the gap with the outer peripheral wall of the rotor 1.

[0073] For example, Figure 3 As shown, the first baffle 32, the second baffle 33 and the sealing sheet 34 can all be fan-shaped and can be arranged along the circumferential direction of the rotor 1, wherein the first baffle 32 can be installed on the left side of the sealing sheet 34, and the second baffle 33 can be installed on the right side of the sealing sheet 34. The sealing sheet 34 can protrude from the first baffle and the second baffle when facing the inner side of the rotor 1. When in use, the inner side of the sealing sheet 34 can be in abutment contact with the outer peripheral contour of the rotor 1, etc., so that the gap sealing can be achieved by the sealing sheet 34.

[0074] Compared with the structure of the brush wire, the sealing sheet 34 is in sheet shape as a whole, so the number of flexible units can be reduced, which can reduce the cost and improve the convenience of installation and overall reliability.

[0075] In some embodiments, the first baffle plate 32 is provided with a first hole 321 that penetrates the first baffle plate 32 axially, the sealing plate 34 is provided with a second hole 341 that penetrates the sealing plate 34 axially, the second baffle plate 33 is provided with a balancing cavity 331, and the balancing cavity 331 is located between the sealing plate 34 and the second baffle plate 33, and the first hole 321, the second hole 341, and the balancing cavity 331 are connected.

[0076] For example, Figure 3As shown, both the first hole 321 and the second hole 341 penetrate the first baffle 32 and the sealing piece 34 along the left - right direction respectively. The first hole 321 and the second hole 341 are arranged opposite to each other in the left - right direction and are directly connected. The balance cavity 331 can be arranged on the left side of the second baffle 33, and the second hole 341 can communicate between the first hole 321 and the balance cavity 331. Thus, it can play a role in separating the sealing piece 34 and the second baffle 33, thereby avoiding the hysteresis effect caused by friction between the sealing piece 34 and the second baffle 33.

[0077] Optionally, the first baffle can be fixedly connected to the left side of the sealing piece 34, the left side of the second baffle can be fixedly connected to the right side of the sealing piece 34, and the right side of the second baffle can be slidably assembled with the stator 2 in the radial direction.

[0078] In some embodiments, there are multiple sealing assemblies 3, and the multiple sealing assemblies 3 are arranged at intervals along the circumferential direction of the stator 2. The multiple sealing assemblies 3 as a whole can be assembled into an annular structure, and each sealing assembly 3 can be provided with a sliding member 4, a driving member 5, etc., thus meeting the use requirements for radial adjustment of each sealing assembly 3.

[0079] It should be noted that at this time, the stator 2 can be provided with multiple assembly grooves, the multiple assembly grooves can be arranged at equal intervals along the circumferential direction of the stator 2, and each sealing assembly 3 can be respectively assembled at the corresponding assembly groove.

[0080] In some other embodiments, the assembly groove can also be an annular groove and extends along the circumferential direction of the stator 2 for one week. At this time, the sliding member 4 and the driving member 5 can also be annular. The entire sliding member 4 can be assembled in the assembly groove and can slide in the left - right direction, and the driving member 5 can also be annular and can be arranged on the left side of the sliding member 4. Thus, during use, the synchronous driving adjustment of the multiple sealing assemblies 3 can be ensured.

[0081] In some embodiments, there are multiple sealing pieces 34, and the multiple sealing pieces 34 are stacked in the axial direction. For example, as Figure 3 shown, four sealing pieces 34 can be provided, and the four sealing pieces 34 are stacked in the left - right direction, and the four sealing pieces 34 can be clamped between the first baffle 32 and the second baffle 33.

[0082] In some other embodiments, the number of the sealing pieces 34 can also be three, five, six, etc. The second holes 341 of the multiple sealing pieces 34 are aligned and communicated in the left - right direction.

[0083] The gas turbine of the embodiment of the present invention will be described below.

[0084] The gas turbine of the embodiment of the present invention includes a sealing structure, and the sealing structure can be the sealing structure described in any of the above - mentioned embodiments.

[0085] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0086] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0087] In the present invention, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection, an electrical connection, or capable of communicating with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0088] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0089] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc., mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0090] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Variations, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are all within the scope of protection of the present invention.

Claims

1. A sealing structure, characterized in that, Comprising: A rotor having a radial direction and an axial direction; A stator surrounding the outer peripheral side of the rotor, and an assembly groove is provided on the inner peripheral wall of the stator; A sealing assembly assembled in the assembly groove and slidably adjustable relative to the stator along the radial direction, the sealing assembly being used for clearance sealing with the outer peripheral wall of the rotor and provided with a guiding surface; A sliding member disposed in the assembly groove and slidably adjustable relative to the stator along the axial direction, and the sliding member is used for generating a displacement that drives the sealing assembly to move closer to the rotor when sliding through the abutting cooperation with the guiding surface; A driving member disposed in the assembly groove and used for driving the sliding member to slide along the axial direction.

2. The sealing structure according to claim 1, wherein The driving member is temperature-sensitive and deformable with the change of temperature, and the driving member is used for pushing the sliding member to slide along the axial direction when deforming.

3. The sealing structure according to claim 2, wherein, The driving member includes: An elastomer for releasing elastic potential energy to push the sliding member to slide along the axial direction; A fixing agent having a first form and a second form with the change of temperature. In the first form, the fixing agent is used for fixing the elastomer to inhibit the release of the elastic potential energy of the elastomer. In the second form, the fixing agent releases the inhibition on the elastomer to enable the release of the elastic potential energy of the elastomer.

4. The sealing structure according to claim 3, characterized in that, The first form is a solid state, the second form is a liquid state or a gaseous state, and the fixing agent can be liquefied or vaporized with the increase of temperature so that the fixing agent can be switched from the first form to the second form.

5. The sealing structure according to claim 4, characterized in that, The material of the elastomer is a nickel-based high-temperature resistant alloy; And / or, the material of the fixing agent is acrylic resin, epoxy resin and silica filler; And / or, the cross-section of the elastomer is wavy.

6. The sealing structure according to claim 4, characterized in that, Including a heating member disposed on the stator, and the heating member is used for heating the fixing agent so that the fixing agent is switched from the first form to the second form.

7. The sealing structure according to claim 1, wherein The sliding member is provided with a mating surface, and both the mating surface and the guiding surface are inclined surfaces. The guiding surface is disposed at the end of the sealing assembly away from the rotor. The mating surface and the guiding surface are oppositely arranged in the radial direction and are in abutting contact.

8. The sealing structure according to any one of claims 1-7, characterized in that, The sealing assembly includes a first baffle, a second baffle and a sealing sheet; At least one of the first baffle and the second baffle is slidably mated with the stator in the radial direction, and the first baffle and the second baffle are oppositely arranged in the axial direction. The sealing sheet is axially sandwiched between the first baffle and the second baffle. The guiding surface is disposed on the first baffle, the second baffle and the sealing sheet, and the sealing sheet is used for clearance sealing with the outer peripheral wall of the rotor.

9. The sealing structure according to claim 8, wherein, The first baffle is provided with a first hole axially penetrating the first baffle, the sealing sheet is provided with a second hole axially penetrating the sealing sheet, and the second baffle is provided with a balance cavity located between the sealing sheet and the second baffle. The first hole, the second hole and the balance cavity are communicated; And / or, the assembly groove extends circumferentially along the stator to form a closed loop, or there are a plurality of the assembly grooves, and the plurality of assembly grooves are arranged at intervals along the circumferential direction of the stator; And / or, there are a plurality of the sealing assemblies, and the plurality of sealing assemblies are arranged at intervals along the circumferential direction of the stator; And / or, there are a plurality of the sealing sheets, and the plurality of sealing sheets are stacked in the axial direction.

10. A gas turbine, characterized in that, It includes the sealing structure according to any one of the above-mentioned claims 1-9.

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