Blade seal assembly, turbine and gas turbine

Abstract

The application discloses a blade sealing assembly, a turbine and a gas turbine, and relates to the technical field of turbine sealing, in particular to a blade sealing assembly, a turbine and a gas turbine. The blade sealing assembly comprises a blade group and a sealing piece, the blade group comprises a first blade edge plate and a second blade edge plate, the first blade edge plate is provided with a first groove, the second blade edge plate is provided with a second groove, at least part of the first groove is opposite to the second groove, one end of the sealing piece is arranged in the first groove, the other end of the sealing piece is arranged in the second groove, the sealing piece is provided with a convex part, the convex part is arranged between the first blade edge plate and the second blade edge plate, the convex part protrudes along the thickness direction and has elasticity, so that when the first blade edge plate and the second blade edge plate are expanded by heat, the sealing piece can be elastically deformed, and the problem that the sealing piece is deformed by extrusion or subjected to shearing force and fails can be avoided, therefore, the structure design of the blade sealing assembly of the embodiment of the application is reasonable, the sealing effect is good, and the reliability is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas turbines, in particular to a blade sealing assembly, a turbine and a gas turbine. BACKGROUND

[0002] During the operation of a gas turbine, turbine blades work in high-temperature gas, and cooling gas is introduced into the blades from other parts to reduce the temperature of the blades, ensure the safe and reliable operation of the blades, and improve the service life of the blades. However, when the turbine blades are heated, the deformation of the adjacent turbine blade edge plates is not completely consistent, so that a certain shear force is generated in the sealing structure of the adjacent turbine blade edge plates, which affects the sealing effect of the sealing structure of the adjacent turbine blade edge plates, and reduces the safety of the gas turbine during use. SUMMARY

[0003] The present application aims to at least partially solve one of the technical problems in the related art.

[0004] To this end, the embodiments of the present application propose a blade sealing assembly with a reasonable structure design and good sealing effect.

[0005] The embodiments of the present application also propose a turbine.

[0006] The embodiments of the present application also propose a gas turbine.

[0007] The blade sealing assembly according to the embodiments of the present application comprises: a blade group comprising a first blade edge plate and a second blade edge plate, a first groove is provided on the first blade edge plate, a second groove is provided on the second blade edge plate, and at least part of the first groove is opposite to the second groove; a sealing element, one end of the sealing element is arranged in the first groove, the other end of the sealing element is arranged in the second groove, the sealing element has a protruding portion, the protruding portion is arranged between the first blade edge plate and the second blade edge plate, and the protruding portion protrudes along the thickness direction and has elasticity.

[0008] The blade sealing assembly according to the embodiments of the present application, by arranging one end of the sealing element in the first groove, the other end of the sealing element in the second groove, and the protruding portion of the sealing element between the first blade edge plate and the second blade edge plate, the protruding portion protrudes along the thickness direction and has elasticity, so that when the first blade edge plate and the second blade edge plate are heated and expanded, the elastic protruding portion can be elastically deformed, thereby avoiding the problem of failure of the sealing element due to extrusion deformation or shear force. Therefore, the blade sealing assembly according to the embodiments of the present application has a reasonable structure design, good sealing effect, and high reliability.

[0009] In some embodiments, the seal member comprises a first sealing segment and a second sealing segment, the first sealing segment and the second sealing segment are respectively arranged on opposite sides of the protruding portion, the first sealing segment is arranged in the first groove, the first sealing segment is elastic and can stretch and contract along the depth direction of the first groove, the second sealing segment is arranged in the second groove, and the second sealing segment is elastic and can stretch and contract along the depth direction of the second groove.

[0010] In some embodiments, a plurality of first sealing teeth are arranged on the first sealing segment and arranged along the depth direction of the first groove; and / or a plurality of second sealing teeth are arranged on the second sealing segment and arranged along the depth direction of the second groove.

[0011] In some embodiments, the protruding directions of the first sealing teeth and the second sealing teeth are consistent with the protruding direction of the protruding portion.

[0012] In some embodiments, at least one of the first sealing segment and the second sealing segment is provided with a honeycomb hole.

[0013] In some embodiments, the seal member further comprises a limiting portion, the limiting portion is arranged at one end of the first sealing segment away from the protruding portion, a limiting groove is arranged on the first blade edge plate, and the limiting portion is fitted in the limiting groove to limit the first sealing segment from being separated from the first groove along the depth direction of the first groove.

[0014] In some embodiments, the limiting portion is a bent hook or a spherical protrusion.

[0015] In some embodiments, the protruding portion comprises a first vertical segment, a curved segment and a second vertical segment, one end of the first vertical segment is connected with the first sealing segment, the other end of the first vertical segment is connected with the curved segment, one end of the second vertical segment is connected with the second sealing segment, the other end of the second vertical segment is connected with the curved segment, the first vertical segment and the second vertical segment are arranged in parallel, and the outer peripheral contour of the cross section of the curved segment is arc-shaped.

[0016] The turbine according to another embodiment of the present application comprises: a turbine body and a blade seal assembly, the blade seal assembly is the blade seal assembly according to any one of the above embodiments, the blade seal assembly is arranged in the turbine body, and the first blade edge plate and the second blade edge plate are arranged in a circumferential direction of the turbine body.

[0017] The blade seal assembly of the turbine according to the embodiments of the present application has a reasonable structure design, good sealing effect and high reliability.

[0018] The gas turbine according to still another embodiment of the present application comprises the blade seal assembly according to any one of the above embodiments or the turbine according to the above embodiments.

[0019] The blade seal assembly of the gas turbine according to the embodiments of the present application has a reasonable structure design, good sealing effect and high reliability. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic view of the blade seal assembly according to an embodiment of the present application.

[0021] Figure 2 is a front view of the blade seal assembly according to an embodiment of the present application.

[0022] Figure 3 is a schematic view of the seal member of the blade seal assembly according to an embodiment of the present application.

[0023] Figure 4 is a schematic view of the seal member of the blade seal assembly according to another embodiment of the present application.

[0024] Figure 5 is a schematic view of the first blade or the second blade of the blade seal assembly according to an embodiment of the present application.

[0025] REFERENCE SIGNS:

[0026] 1, first blade; 11, first blade edge plate; 111, first groove; 112, limiting groove;

[0027] 2, second blade; 21, second blade edge plate; 211, second groove;

[0028] 3, seal member; 31, first seal segment; 311, first seal tooth; 312, limiting portion; 32, second seal segment; 321, second seal tooth; 33, protruding portion; 331, first vertical segment; 332, second vertical segment; 333, curved segment. DETAILED DESCRIPTION

[0029] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application, and should not be understood as limiting the present application.

[0030] The following description refers to the accompanying drawings, which are meant to be exemplary and not limiting. Figures 1 to 5 The blade seal assembly, turbine and gas turbine according to embodiments of the present application are described below.

[0031] As Figure 1 , Figure 2 and Figure 5As shown, the vane sealing assembly according to the embodiment of the present application comprises a vane set and a sealing member 3. The vane set comprises a first vane rim plate 11 and a second vane rim plate 21, the first vane rim plate 11 is provided with a first groove 111, the second vane rim plate 21 is provided with a second groove 211, at least part of the first groove 111 is opposite to the second groove 211. One end of the sealing member 3 is arranged in the first groove 111, the other end of the sealing member 3 is arranged in the second groove 211, the sealing member 3 has a protruding part 33, the protruding part 33 is arranged between the first vane rim plate 11 and the second vane rim plate 21, the protruding part 33 protrudes along the thickness direction (such as the inner-outer direction in the figure) and has elasticity. Figure 2

[0032] It can be understood that the vane set comprises a first vane 1 and a second vane 2, the first vane 1 and the second vane 2 are arranged along the circumference of the turbine body. The first vane rim plate 11 is arranged on the first vane 1, and the second vane rim plate 21 is arranged on the second vane 2. The gap between the first vane rim plate 11 and the second vane rim plate 21 is sealed by the sealing member 3.

[0033] The vane sealing assembly according to the embodiment of the present application, by arranging one end of the sealing member 3 in the first groove 111, arranging the other end of the sealing member 3 in the second groove 211, and arranging the protruding part 33 of the sealing member 3 between the first vane rim plate 11 and the second vane rim plate 21, the protruding part 33 protrudes along the thickness direction and has elasticity, so that when the first vane rim plate 11 and the second vane rim plate 21 are heated and expanded, the elastic protruding part 33 can be elastically deformed, thereby avoiding the problem that the sealing member 3 is deformed by extrusion or subjected to shear force and fails. Therefore, the structure design of the vane sealing assembly of the embodiment of the present application is reasonable, the sealing effect is good, and the reliability is high.

[0034] It can be understood that the inventors of the present application found through experimental research that when the vane rim plate is heated and expanded, the circumferential gap is reduced, the width of the sealing groove is reduced, the sealing member 3 is at risk of being extruded, and the sealing member 3 fails. When the gas turbine starts, the holding ring expands quickly, causing the vane circumferential gap to increase, and when the circumferential gap increases to a certain extent, the sealing member 3 is at risk of being pulled out from one side of the sealing groove. The adjacent two vanes are unevenly heated, the rim plate has inconsistent radial deformation, the sealing member 3 is subjected to shear, and the sealing member 3 is torn, resulting in failure of the sealing function. The vane sealing assembly of the embodiment of the present application can prevent the problem of tearing of the sealing member 3 caused by inconsistent deformation of the adjacent two vane rim plates, and can prevent the problem of extrusion deformation of the sealing member 3 caused by the reduction of the circumferential gap between the vane sets, while ensuring that the sealing member 3 is not easily pulled out of the sealing groove, which is conducive to safe operation of the turbine.

[0035] Specifically, as shown in​Figures 1 to 4 As shown, the seal 3 comprises a first sealing section 31 and a second sealing section 32, the first sealing section 31 and the second sealing section 32 are respectively arranged on opposite sides of the protruding part 33, the first sealing section 31 is arranged in the first groove 111, the first sealing section 31 is elastic and can stretch and contract along the depth direction of the first groove 111, the second sealing section 32 is arranged in the second groove 211, the second sealing section 32 is elastic and can stretch and contract along the depth direction of the second groove 211. Since the first sealing section 31 and the second sealing section 32 are elastic and can respectively move along the depth direction of the first groove 111 and the second groove 211, the seal 3 can have a certain elastic stretching amount, which can avoid the problem of tearing of the seal 3 caused by the uncoordinated deformation of the adjacent two blade edge plates, and improve the reliability of the seal 3 in use.

[0036] Optionally, as shown in Figures 1 to 4 The first sealing section 31 is provided with a plurality of first sealing teeth 311, and the plurality of first sealing teeth 311 are arranged along the depth direction of the first groove 111. The second sealing section 32 is provided with a plurality of second sealing teeth 321, and the plurality of second sealing teeth 321 are arranged along the depth direction of the second groove 211. It can be understood that since the first sealing section 31 and the second sealing section 32 are both provided with tooth-like structures, the sealing effect of the first sealing section 31 and the second sealing section 32 will not be affected, and the first sealing section 31 and the second sealing section 32 can have good elastic deformation effect, thereby improving the reliability of the seal 3 in use.

[0037] Optionally, as shown in Figures 1 to 4 The protruding directions of the first sealing teeth 311 and the second sealing teeth 321 are consistent with the protruding direction of the protruding part 33. It can be understood that the first sealing teeth 311, the second sealing teeth 321 and the protruding part 33 all protrude outward along the radial direction of the blade group, so that under the action of the pressure difference on both sides, the lower edge of the seal 3 forms a line contact or a surface contact with the bottom surface of the first groove 111 and the second groove 211, which can make the seal 3 have a good sealing effect with the first blade edge plate 11 and the second blade edge plate 21.

[0038] Optionally, at least one of the first sealing section 31 and the second sealing section 32 is provided with a honeycomb hole. For example, the first sealing section 31 and the second sealing section 32 are both provided with a honeycomb hole, so that the first sealing section 31 and the second sealing section 32 can be simply manufactured and have good use effect.

[0039] In some embodiments, as shown in Figures 1 to 4As shown, the sealing member 3 further comprises a limiting portion 312, which is arranged at one end of the first sealing segment 31 away from the protruding portion 33. A limiting groove 112 is arranged on the first blade rim plate 11, and the limiting portion 312 is fitted in the limiting groove 112 to limit the first sealing segment 31 from being separated from the first groove 111 along the depth direction of the first groove 111. For example, the limiting portion 312 is a bent hook or a spherical protrusion. The embodiment of the present application can avoid the problem of the sealing member 3 being separated from the first groove 111 by arranging the sealing member 3 in the above structure, thereby improving the reliability of the connection of the sealing member 3 and prolonging the service life of the sealing member 3.

[0040] It can be understood that, when the sealing member 3 is installed, the sealing sheet can be slid into the designed position from the air inlet side or the air outlet side through the first groove 111 and the second groove 211 after the installation of the blade group is completed. The limiting portion 312 forms a surface contact with the limiting groove 112, and under the action of the pressure difference on both sides, the lower edge of the sealing member 3 forms a line contact or a surface contact with the bottom surface of the first groove 111 and the second groove 211. In this way, the radial direction and the circumferential direction of the sealing member 3 are limited by the first groove 111 and the second groove 211, and the axial direction of the sealing member 3 can be fixed to the blade rim plate at one end by spot welding.

[0041] Specifically, as shown in Figs. 1 and 2, Figure 3 and Figure 4 As shown, the protruding portion 33 comprises a first vertical segment 331, a curved segment 333 and a second vertical segment 332. One end of the first vertical segment 331 is connected with the first sealing segment 31, the other end of the first vertical segment 331 is connected with the curved segment 333, one end of the second vertical segment 332 is connected with the second sealing segment 32, the other end of the second vertical segment 332 is connected with the curved segment 333, the first vertical segment 331 and the second vertical segment 332 are arranged in parallel and are arranged in a substantially orthogonal manner with respect to the first sealing segment 31 and the second sealing segment 32, and the outer peripheral contour of the cross section of the curved segment 333 is arc-shaped. For example, the arc can be a superior arc or an inferior arc. The embodiment of the present application can make the elastic deformation effect of the sealing member 3 better and the reliability of the sealing higher by arranging the protruding portion 33 of the sealing member 3 in the above structure.

[0042] Optionally, the material of the sealing member 3 needs to have good low-cycle fatigue resistance, so as to prolong the service life of the sealing member 3 and reduce the replacement cycle of the sealing member 3.

[0043] The turbine according to another embodiment of the present application comprises: a turbine body and a blade sealing assembly. The blade sealing assembly is the blade sealing assembly according to the embodiment of the present application, and the blade sealing assembly is arranged in the turbine body. The first blade rim plate 11 and the second blade rim plate 21 are arranged in a spaced manner along the circumferential direction of the turbine body.

[0044] The blade sealing assembly of the turbine according to the embodiment of the present application has a reasonable structure design, a better sealing effect and high reliability.

[0045] The gas turbine according to still another embodiment of the present application comprises the blade seal assembly or turbine according to embodiments of the present application.

[0046] The blade seal assembly of the gas turbine according to embodiments of the present application has a reasonable structure design, good sealing effect and high reliability.

[0047] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential” and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0048] In addition, the terms “first” and “second” are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with “first” and “second” can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of “plurality” is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0049] In the present application, unless otherwise explicitly specified and limited, the terms “mounting”, “connection”, “connecting”, “fixing” and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or can be integrated; can be mechanical connection, can also be electrical connection or communication with each other; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] In the present application, unless otherwise explicitly specified and limited, the first feature is “on” or “under” the second feature, which can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature can be above or obliquely above the second feature, or it can only mean that the horizontal height of the first feature is higher than that of the second feature. The first feature can be below or obliquely below the second feature, or it can only mean that the horizontal height of the first feature is less than that of the second feature.

[0051] In this disclosure, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present application. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily referred to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the terminology "comprising" is used in the

[0052] Although the embodiments of the present application have been shown and described above, it is understood that the above-mentioned embodiments are exemplary, and are not construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements, and variations to the above-mentioned embodiments within the scope of the present application.

Claims

1. A blade sealing assembly, characterized in that: include: A blade assembly, the blade assembly comprising a first blade edge plate and a second blade edge plate, the first blade edge plate being provided with a first groove, the second blade edge plate being provided with a second groove, at least a portion of the first groove being opposite to the second groove; a sealing member, one end of the sealing member being disposed in the first groove, and the other end of the sealing member being disposed in the second groove, the sealing member having a raised portion disposed between the first blade edge plate and the second blade edge plate, the raised portion protruding along its thickness direction and being elastic, the sealing member comprising a first sealing segment and a second sealing segment, the first sealing segment and the second sealing segment being disposed on opposite sides of the raised portion, respectively, the first sealing segment being disposed in the first groove, and the second sealing segment being disposed in the second groove, and at least one of the first sealing segment and the second sealing segment being provided with honeycomb holes; The limiting portion is provided at one end of the first sealing segment away from the raised portion, and a limiting groove is provided on the first blade edge plate. The limiting portion is engaged in the limiting groove to limit the first sealing segment from being separated from the first groove along the depth direction of the first groove. The limiting portion is a bent hook or a spherical protrusion, and the limiting portion forms surface contact with the limiting groove. At the same time, under the action of the pressure difference on both sides, the lower edge of the seal forms line contact or surface contact with the bottom surfaces of the first groove and the second groove. The radial and circumferential directions of the seal are limited by the first groove and the second groove, and the axial direction of the seal is fixed to the blade edge plate at one end by spot welding.

2. The blade sealing assembly according to claim 1, wherein: The first sealing section is elastic and can be stretched and retracted along the depth direction of the first groove, and the second sealing section is elastic and can be stretched and retracted along the depth direction of the second groove.

3. The blade sealing assembly according to claim 2, wherein: The first sealing segment is provided with a plurality of first sealing teeth, and the plurality of first sealing teeth are arranged along the depth direction of the first groove; And / or, the second sealing segment is provided with a plurality of second sealing teeth, and the plurality of second sealing teeth are arranged along a depth direction of the second groove.

4. The blade sealing assembly according to claim 3, wherein: The protruding direction of the first sealing teeth and the second sealing teeth is consistent with the protruding direction of the protruding portion.

5. The blade sealing assembly according to claim 2, wherein: The raised portion includes a first vertical segment, a curved segment, and a second vertical segment. One end of the first vertical segment is connected to the first sealing segment, and the other end of the first vertical segment is connected to the curved segment. One end of the second vertical segment is connected to the second sealing segment, and the other end of the second vertical segment is connected to the curved segment. The first vertical segment and the second vertical segment are arranged substantially parallel, and the outer peripheral contour of the cross section of the curved segment is arc-shaped.

6. A turbine characterized by: include: A turbine body and a blade sealing assembly, wherein the blade sealing assembly is the blade sealing assembly according to any one of claims 1 to 5, wherein the blade sealing assembly is arranged in the turbine body, and the first blade edge plate and the second blade edge plate are arranged at intervals along the circumference of the turbine body.

7. A gas turbine, characterized in that: The present invention comprises the blade sealing assembly according to any one of claims 1 to 5 or the turbine according to claim 6.

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