Blade tip, turbine blade and turbine power equipment

Abstract

The invention provides a blade tip, a turbine blade and turbine power equipment. The turbine blade comprises a blade body, the blade body comprises a blade body and a blade top, the blade body is made of metal materials, the blade top is made of ceramic-based materials, and the blade top is fixedly arranged at the top of the blade body. Therefore, the turbine blade is high in ablation resistance and long in service life.

Description

Technical Field

[0001] The present invention relates to the technical field of gas turbines, and in particular to a blade tip, a turbine blade and a turbine power device. Background Art

[0002] In the related technology, gas turbines and aircraft engines often operate at very high gas temperatures. In order to ensure that the turbine blades are not damaged by the high-temperature gas, the turbine blades are designed to be hollow, and a complex cooling structure is arranged in the internal space of the blades. Then, cold air is introduced to reduce the temperature of the turbine blades. The blade tips of the moving blades are located in the high-temperature gas. In order to avoid being damaged by the high-temperature gas, they need to be cooled. However, the blade tips of the moving blades generally adopt a double shoulder structure, which makes it difficult to arrange the cooling structure. In addition, due to the pursuit of higher thermal efficiency, a large amount of cold air cannot be used. Therefore, the temperature of the blade tips is high and it is easy to burn. After the blade tips of the moving blades are burned, the leakage of the blade tips increases, reducing the power output of the engine, or damaging the entire blade, causing serious safety accidents. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the embodiments of the present invention provide a blade tip, a turbine blade and a turbine power device.

[0004] The turbine blade of the embodiment of the present invention comprises: a blade body, wherein the blade body comprises a blade body and a blade top, wherein the blade body is made of a metal material, the blade top is made of a ceramic-based material, and the blade top is fixed to the top of the blade body.

[0005] Therefore, the turbine blades according to the embodiments of the present invention have strong ablation resistance and a long service life.

[0006] In some embodiments, the blade tip has a connection hole;

[0007] The blade body is provided with a connecting column;

[0008] The blade body comprises a connecting member, a part of the connecting column is located in the connecting hole, the connecting member is connected to the connecting column and at least a part of the blade top is arranged between the blade body and the connecting member.

[0009] In some embodiments, the connecting hole passes through the blade top along the extension direction of the blade body;

[0010] The connecting piece and the connecting column are both made of metal material, and the top of the connecting column extends out of the connecting hole and is welded to the connecting piece.

[0011] In some embodiments, the blade tip includes a blade tip bottom plate and a convex shoulder, the thickness direction of the blade tip bottom plate is consistent with the extension direction of the blade body, the extension direction of the convex shoulder is consistent with the extension direction of the blade body, and the convex shoulder is arranged at the top of the outer edge of the blade tip bottom plate;

[0012] The blade body includes a blade body side plate and a blade body top plate, and the outer edge of the blade body top plate is connected to the top of the blade body side plate;

[0013] The connecting hole is opened on the blade top bottom plate, the connecting column is arranged on the top of the blade body top plate, the connecting piece is annular, the connecting piece is sleeved on the outside of the connecting column and fits with the top surface of the blade top bottom plate, the maximum diameter of the connecting piece is larger than the diameter of the connecting hole, and the top of the connecting piece is welded to the connecting column.

[0014] In some embodiments, a plurality of the connection holes are provided on the blade top bottom plate;

[0015] A plurality of connecting posts are provided on the top of the blade top plate, and the plurality of connecting posts are matched in a one-to-one correspondence in the plurality of connecting holes.

[0016] In some embodiments, the connecting post is located below the top of the boss, or the top surface of the connecting post is coplanar with the top surface of the boss;

[0017] The shapes of the connecting hole and the connecting column are adapted, and the outer peripheral contour of the cross section of the connecting column is one of a circle, an ellipse and an oblong;

[0018] The plurality of connection holes are arranged at intervals along the extension direction of the mid-camber line of the blade tip.

[0019] In some embodiments, in the extension direction of the center arc line of the blade tip, the ratio of the distance between the connection hole and the leading edge of the blade tip to the size of the center arc line of the blade tip is (0.05-0.9):1.

[0020] In some embodiments, the size of the blade tip in the extension direction of the blade body is greater than or equal to 10 mm and less than or equal to 30 mm;

[0021] And / or, in the extension direction of the blade body, the size ratio of the blade tip to the blade body is (0.04-0.06):1.

[0022] The present invention also proposes a blade top, which is made of a ceramic-based material. The blade top includes a blade top bottom plate and a boss. The thickness direction of the blade top bottom plate is consistent with the extension direction of the boss. The boss is arranged at the top of the outer edge of the blade top bottom plate, and a connecting hole is opened on the blade top bottom plate.

[0023] The present invention also provides a turbine power device, which comprises the turbine blades mentioned above. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of a blade body according to an embodiment of the present invention.

[0025] Figure 2 Schematic diagram of a blade body provided with a connecting column according to an embodiment of the present invention.

[0026] Figure 3 is a schematic diagram of a blade tip according to an embodiment of the present invention.

[0027] Figure 4 is a cross-sectional view of a blade body according to an embodiment of the present invention.

[0028] Figure 5 Schematic diagram of cross sections of various connecting pillars according to an embodiment of the present invention.

[0029] Reference numerals:

[0030] 1. blade body, 11. connecting column, 12. blade body side plate, 13. blade body top plate;

[0031] 2. blade top, 21. connection hole, 22. blade top bottom plate, 23. shoulder, 24. center camber line;

[0032] 3. Connectors, 31. Welds. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0034] The turbine blade according to the embodiment of the present invention is described below with reference to the accompanying drawings. The present invention also proposes a blade tip 2, and the turbine blade according to the embodiment of the present invention is specifically described below in conjunction with the blade tip 2 according to the embodiment of the present invention.

[0035] like Figures 1 to 5As shown, a turbine blade according to an embodiment of the present invention includes a blade body, the blade body includes a blade body 1 and a blade tip 2, the blade body 1 is made of a metal material, the blade tip 2 is made of a ceramic-based material, and the blade tip 2 is fixed at the top of the blade body 1. Specifically, the extension direction of the blade body is the height direction of the blade body, the blade tip 2 is fixed at the end of the blade body 1 away from the rotating shaft, and the bottom of the blade body 1 (the end adjacent to the rotating shaft) is provided with a blade root connected to the rotating shaft. Ceramic-based materials are a type of composite material composed of a ceramic matrix reinforced with ceramic fibers or whiskers. They combine the high hardness, high temperature resistance and corrosion resistance of traditional ceramic materials with the high strength and toughness of composite materials. Ceramic-based materials have good thermal structural properties, that is, mechanical properties that enable them to constitute structural components (blade tips 2) and maintain these properties at high temperatures. The high temperature resistance of ceramic-based materials is much higher than that of high-temperature alloy materials, and the density is lower than that of high-temperature alloy materials. The blade tip 2 is made of ceramic-based materials, which enhances the ablation resistance of the blade tip 2. The blade body 1 and the blade tip 2 are made of two different materials, and then the blade tip 2 is connected to the blade body 1. When using less or no cooling air, the risk of turbine blade operation is reduced and the efficiency of the engine is increased. It can also reduce the mass of the entire moving blade, thereby reducing the centrifugal force of the moving blade and increasing the operating life of the turbine blade.

[0036] Therefore, the turbine blades according to the embodiments of the present invention have strong ablation resistance and a long service life.

[0037] like Figures 1 to 5 As shown, the blade top 2 includes a blade top bottom plate 22 and a convex shoulder 23. The thickness direction of the blade top bottom plate 22 is consistent with the extension direction of the blade body, and the extension direction of the convex shoulder 23 is consistent with the extension direction of the blade body. That is, the thickness direction of the blade top bottom plate 22 is consistent with the extension direction of the convex shoulder 23. The convex shoulder 23 is arranged at the top of the outer edge of the blade top bottom plate 22, so that the blade top bottom plate 22 and the convex shoulder 23 define an opening facing away from the blade body 1 slot. The blade body 1 includes a blade body side plate 12 and a blade body top plate 13. The outer edge of the blade body top plate 13 is connected to the top of the blade body side plate 12. The blade body side plate 12 defines the leading edge, trailing edge, pressure side and suction side of the blade body 1. The top surface of the blade body top plate 13 is adapted to the bottom surface of the blade top bottom plate 22 so that the top surface of the blade body top plate 13 fits with the bottom surface of the blade top bottom plate 22. For example, an opening is provided at a position of the shoulder 23 at the trailing edge of the blade tip 2 , and the opening is provided at the pressure side of the shoulder 23 .

[0038] In some embodiments, the blade tip 2 has a connection hole 21, and the blade body 1 is provided with a connection column 11. The blade body includes a connection member 3, a portion of the connection column 11 is located in the connection hole 21, and the connection member 3 is connected to the connection column 11 and at least a portion of the blade tip 2 is arranged between the blade body 1 and the connection member 3. In this way, the blade body 1 can be connected to the blade tip 2.

[0039] In some embodiments, the connection hole 21 passes through the blade tip 2 along the extension direction of the blade body. The connection member 3 and the connection column 11 are both made of metal material, and the top of the connection column 11 extends out of the connection hole 21 and is welded to the connection member 3. The connection column 11 is located below the top of the boss 23, or the top surface of the connection column 11 is coplanar with the top surface of the boss 23, that is, the height of the connection column 11 is lower than or equal to the boss 23.

[0040] like Figure 4 As shown, specifically, the connection hole 21 is provided on the blade top bottom plate 22, and the connection hole 21 penetrates the blade top bottom plate 22 along the extension direction of the blade body. The connection column 11 is provided at the top of the blade body top plate 13, and the connection member 3 is annular. The blade top bottom plate 22 is provided with a connection hole 21, and the connection column 11 passes through the connection hole 21 and the top of the connection column 11 is located above the blade body top plate 13. The connection member 3 is sleeved on the outside of the connection column 11 and fits with the top surface of the blade top bottom plate 22. The maximum diameter of the connection member 3 is greater than the diameter of the connection hole 21, and the top of the connection member 3 is welded to the connection column 11. Thus, the top of the connection member 3 can be connected to the connection column 11 through the weld 31, so that the connection member 3, the blade body 1 and the connection column 11 can clamp the blade top bottom plate 22 between the connection member 3 and the blade body 1, so that the blade body 1 is connected to the blade top 2. For example, the connection column 11 is integrally formed with the blade body 1. The weld 31 is annular, and the inner side surface of the weld 31 is connected to the outer peripheral surface of the connecting column 11. The bottom surface of the weld 31 is connected to the top surface of the connecting piece 3. The blade body 1, the connecting column 11 and the connecting piece 3 are made of high temperature alloy material.

[0041] In some embodiments, the connecting member 3 is threadedly connected to the connecting column 11 .

[0042] like Figure 2 and Figure 3 As shown, in some embodiments, a plurality of connection holes 21 are provided on the blade top bottom plate 22. A plurality of connection posts 11 are provided on the top of the blade body top plate 13, and the plurality of connection posts 11 are matched in a one-to-one correspondence in the plurality of connection holes 21. Specifically, the number of the connection posts 11 and the connection holes 21 is greater than or equal to two.

[0043] In some embodiments, a plurality of connection holes 21 are arranged at intervals along the extension direction of the median arc line 24 of the blade tip 2. Specifically, the median arc line refers to a curve drawn along the leading edge to the trailing edge (trailing edge) of the blade tip 2, which is located between the pressure side and the suction side of the airfoil of the blade tip 2, and divides the pressure side and the suction side equidistantly. A plurality of connection holes 21 are arranged at intervals along the extension direction of the median arc line 24 of the blade tip 2, so that the connection position between the connection column 11 and the blade tip 2 can be located on the median arc line 24 of the blade tip 2, that is, the connection position between the connection column 11 and the blade tip 2 is located in the middle position of the blade tip bottom plate 22, so that the connection between the blade body 1 and the blade tip 2 can be stable.

[0044] like Figure 3As shown, in some embodiments, in the extension direction of the camber line 24 of the blade tip 2, the ratio of the distance between the connection hole 21 and the leading edge of the blade tip 2 to the camber line 24 of the blade tip 2 is (0.05-0.9):1. Specifically, among the plurality of connection holes 21, the ratio of the distance between the connection hole 21 closest to the leading edge of the blade tip 2 and the leading edge of the blade tip 2 to the camber line 24 of the blade tip 2 may be 0.05, and the ratio of the distance between the connection hole 21 farthest from the leading edge of the blade tip 2 and the leading edge of the blade tip 2 to the camber line 24 of the blade tip 2 may be 0.9. For example, among the plurality of connection holes 21, the ratio of the distance between the connection hole 21 closest to the leading edge of the blade tip 2 and the leading edge of the blade tip 2 to the camber line 24 of the blade tip 2 is 0.25, and the ratio of the distance between the connection hole 21 farthest from the leading edge of the blade tip 2 and the leading edge of the blade tip 2 to the camber line 24 of the blade tip 2 is 0.7.

[0045] like Figure 5 As shown, in some embodiments, the shapes of the connecting hole 21 and the connecting column 11 are adapted, and the outer peripheral contour of the cross section of the connecting column 11 is one of a circle, an ellipse and an oblong. Specifically, the shapes of the multiple connecting columns 11 may be different. When the outer peripheral contour of the cross section of the connecting column 11 is a circle, the connecting hole 21 matched with the connecting column 11 is a circular hole. When the outer peripheral contour of the cross section of the connecting column 11 is an ellipse, the connecting hole 21 matched with the connecting column 11 is an ellipse. When the outer peripheral contour of the cross section of the connecting column 11 is an oblong, the connecting hole 21 matched with the connecting column 11 is an oblong. The oblong is between a circle and an ellipse, has a pair of symmetric axes, and visually presents an elongated circular effect. The oblong includes a first straight line segment, a second straight line segment, a first circular arc segment and a second semicircular arc segment, and the two ends of the first circular arc segment and the two ends of the second semicircular arc segment are connected by the first straight line segment and the second straight line segment, respectively, and the first straight line segment and the second straight line segment are arranged in parallel. For example, the first circular arc segment and the second semicircular arc segment are both semicircular arc segments.

[0046] In some embodiments, the size of the blade tip 2 in the extension direction of the blade body is greater than or equal to 10 mm and less than or equal to 30 mm; and / or, in the extension direction of the blade body, the size ratio of the blade tip 2 to the blade body is (0.04-0.06):1. That is to say, the size of the blade tip 2 includes: a. The size of the blade tip 2 in the extension direction of the blade body is greater than or equal to 10 mm and less than or equal to 30 mm; b. In the extension direction of the blade body, the size ratio of the blade tip 2 to the blade body is (0.04-0.06):1; c. The size of the blade tip 2 in the extension direction of the blade body is greater than or equal to 10 mm and less than or equal to 30 mm, and in the extension direction of the blade body, the size ratio of the blade tip 2 to the blade body is (0.04-0.06):1. For example, the size of the blade tip 2 in the extension direction of the blade body is 20 mm, and in the extension direction of the blade body, the size ratio of the blade tip 2 to the blade body is 0.05:1.

[0047] The present invention further provides a turbine power device, wherein the turbine power device according to an embodiment of the present invention comprises a turbine blade according to an embodiment of the present invention. For example, the turbine power device is a gas turbine or an aircraft engine.

[0048] Therefore, the turbine blades of the turbine power equipment according to the embodiment of the present invention have strong ablation resistance and long service life.

[0049] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0050] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0051] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean 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, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0053] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction 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 described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0054] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A turbine blade, characterized in that: include: The blade body comprises a blade body and a blade top, the blade body is made of a metal material, the blade top is made of a ceramic-based material, and the blade top is fixed on the top of the blade body.

2. The turbine blade according to claim 1, characterized in that The blade top has a connecting hole; The blade body is provided with a connecting column; The blade body comprises a connecting member, a part of the connecting column is located in the connecting hole, the connecting member is connected to the connecting column and at least a part of the blade top is arranged between the blade body and the connecting member.

3. The turbine blade according to claim 2, characterized in that The connecting hole passes through the blade top along the extension direction of the blade body; The connecting piece and the connecting column are both made of metal material, and the top of the connecting column extends out of the connecting hole and is welded to the connecting piece.

4. The turbine blade according to claim 3, characterized in that The blade tip comprises a blade tip bottom plate and a convex shoulder, the thickness direction of the blade tip bottom plate is consistent with the extension direction of the blade body, the extension direction of the convex shoulder is consistent with the extension direction of the blade body, and the convex shoulder is arranged at the top of the outer edge of the blade tip bottom plate; The blade body includes a blade body side plate and a blade body top plate, and the outer edge of the blade body top plate is connected to the top of the blade body side plate; The connecting hole is opened on the blade top bottom plate, the connecting column is arranged on the top of the blade body top plate, the connecting piece is annular, the connecting piece is sleeved on the outside of the connecting column and fits with the top surface of the blade top bottom plate, the maximum diameter of the connecting piece is larger than the diameter of the connecting hole, and the top of the connecting piece is welded to the connecting column.

5. The turbine blade according to claim 4, characterized in that The blade top bottom plate is provided with a plurality of the connection holes; A plurality of connecting posts are provided on the top of the blade top plate, and the plurality of connecting posts are matched in a one-to-one correspondence in the plurality of connecting holes.

6. The turbine blade according to claim 5, characterized in that The connecting column is located below the top of the boss, or the top surface of the connecting column is coplanar with the top surface of the boss; The shapes of the connecting hole and the connecting column are adapted, and the outer peripheral contour of the cross section of the connecting column is one of a circle, an ellipse and an oblong; The plurality of connection holes are arranged at intervals along the extension direction of the mid-camber line of the blade tip.

7. The turbine blade according to claim 6, characterized in that In the extension direction of the center arc line of the blade top, the size ratio of the distance between the connecting hole and the leading edge of the blade top to the center arc line of the blade top is (0.05-0.9):

1.

8. The turbine blade according to any one of claims 1 to 7, characterized in that: The dimension of the blade tip in the extension direction of the blade body is greater than or equal to 10 mm and less than or equal to 30 mm; And / or, in the extension direction of the blade body, the size ratio of the blade tip to the blade body is (0.04-0.06):

1.

9. A blade tip, characterized in that: The blade top is made of a ceramic-based material, and includes a blade top bottom plate and a boss. The thickness direction of the blade top bottom plate is consistent with the extension direction of the boss. The boss is arranged at the top of the outer edge of the blade top bottom plate, and a connecting hole is opened on the blade top bottom plate.

10. A turbine power device, characterized in that: The turbine power equipment comprises the turbine blade according to any one of claims 1-8.

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