Turbine blade surface strengthening anti-erosion protection device

Abstract

The invention relates to the technical field of turbine blades, and discloses a turbine blade surface strengthening anti-erosion protection device which comprises a blade body, a blade surface strengthening structure is movably installed on the outer portion of the blade body, and an anti-erosion protection structure is fixedly installed on the outer surface of the blade surface strengthening structure. The anti-erosion protection structure comprises a substrate bonding layer, a transition layer, a functional layer and a top protection layer. According to the turbine blade surface strengthening anti-erosion protection device, the base bonding layer is based on epoxy resin and is tightly bonded with the high-strength metal protection net through a silane coupling agent, and the overall stability is guaranteed; the nickel-based alloy and titanium carbide in the transition layer have a synergistic effect, so that the structural toughness and the erosion resistance are enhanced; the functional layer tungsten carbide is high in hardness, wear-resistant and erosion-resistant; the aluminum oxide coating of the top protection layer is resistant to corrosion and high in thermal stability, and thermal stress is relieved; corrosion and erosion are effectively prevented, blade protection performance is maintained, the service life of the blade is prolonged, and efficient and stable operation of the turbine is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of steam turbine blades, in particular to a steam turbine blade surface strengthening and anti-erosion protection device. Background Art

[0002] In modern power production, steam turbines are one of the core equipment, and their performance is directly related to the efficiency and stability of the entire power generation system. Existing steam turbine blades are usually made of high-temperature alloy materials, and their corrosion resistance and erosion resistance are enhanced through surface treatment or coating technology. However, traditional protection measures mostly rely on a single material or simple alloying treatment.

[0003] Although the existing technology provides a certain degree of protection for turbine blades, there are still several problems that need to be solved. First, the comprehensive performance of traditional coating materials is insufficient, and it is impossible to achieve a balance between high strength, high corrosion resistance and good wear resistance. Second, during long-term operation, due to factors such as mismatched thermal expansion coefficients, the coating is prone to peeling or cracking, which greatly reduces the protection effect. Therefore, we propose a turbine blade surface enhancement anti-erosion protection device. Summary of the invention

[0004] 1. Technical issues to be resolved In view of the shortcomings of the prior art, the present invention provides a turbine blade surface enhanced anti-erosion protection device, which has excellent corrosion and erosion resistance, can adapt to complex working environments, and solves the problem that the comprehensive performance of traditional coating materials is insufficient and the balance of high strength, high corrosion resistance and good wear resistance cannot be achieved at the same time; secondly, during long-term operation, due to factors such as mismatch of thermal expansion coefficient, the coating is prone to peeling or cracking, resulting in a significant reduction in the protection effect.

[0005] (II) Technical solution In order to achieve the above-mentioned purpose of having excellent anti-corrosion and anti-erosion properties and being able to adapt to complex working environments, the present invention provides the following technical solutions: a steam turbine blade surface strengthening anti-erosion protection device, comprising a blade body, the top and bottom of the blade body are respectively fixedly mounted with a blade crown and an inner radial surface, the bottom of the inner radial surface is fixedly mounted with a blade root, the outside of the blade body is movably mounted with a blade surface strengthening structure, and the outer surface of the blade surface strengthening structure is fixedly mounted with an anti-erosion protection structure; The blade surface strengthening structure includes a high-strength metal protection net, a plug-in sleeve, a through sleeve, a limit sleeve, a limit box, a limit plug, a pull rod and a spring. A high-strength metal protection net is movably installed outside the blade body. The outer surface of the high-strength metal protection net is fixedly installed with a plug-in sleeve and a through sleeve. The top of the inner radial surface is fixedly installed with a limit sleeve, and the bottom of the inner radial surface is fixedly installed with a limit box. A limit plug and a pull rod are slidably connected inside the limit box, and a spring is fixedly installed inside the limit box. The erosion-resistant protection structure includes a base bonding layer, a transition layer, a functional layer and a top protective layer.

[0006] Preferably, limit sleeves are fixedly installed at both the bottom of the blade crown and the top of the inner radial surface. Two plug-in sleeves are fixedly installed at one end of the high-strength metal protection net, and two through sleeves are fixedly installed at the other end of the high-strength metal protection net.

[0007] Preferably, one through sleeve is attached to the outside of each limit sleeve, and one plug-in sleeve is attached to the side of each through sleeve away from the limit sleeve. Limit boxes are fixedly installed at both the top and the bottom of the inner radial surface of the blade crown.

[0008] Preferably, a limit plug, a pull rod and a spring are installed inside each limit box. The pull rod is fixedly connected to the limit plug, and the spring is sleeved outside the pull rod.

[0009] Preferably, one end of the spring is fixedly connected to the inner wall of the limit box, and the other end of the spring is fixedly connected to the limit plug. The two limit plugs respectively penetrate the blade crown and the inner radial surface, as well as the two limit sleeves and the two through sleeves, and are inserted into the two plug-in sleeves.

[0010] Preferably, the base bonding layer is made of epoxy resin, and the base bonding layer is connected to the outer surface of the high-strength metal protection net through a silane coupling agent.

[0011] Preferably, the transition layer is fixedly installed on the top of the base bonding layer, and the transition layer is prepared by combining nickel-based alloy and titanium carbide.

[0012] Preferably, the functional layer is fixedly installed on the top of the transition layer, and the material of the functional layer is tungsten carbide.

[0013] Preferably, the top protective layer is arranged on the top of the functional layer, and the top protective layer is an alumina coating.

[0014] (III) Beneficial effects Compared with the prior art, the present invention provides a steam turbine blade surface strengthening and erosion-resistant protection device, which has the following beneficial effects: 1. The surface strengthening and erosion-resistant protection device for steam turbine blades effectively compensates for the defects of traditional coatings. The erosion-resistant protection structure has an erosion-resistant protection structure that effectively makes up for the defects of traditional coatings; the base bonding layer is based on epoxy resin and is tightly bonded to the high-strength metal protection net through a silane coupling agent to ensure the overall stability; in the transition layer, the nickel-based alloy and titanium carbide act synergistically to enhance the structural toughness and erosion resistance; the functional layer of tungsten carbide resists erosion with high hardness and wear resistance; the alumina coating on the top protective layer is corrosion-resistant and has strong thermal stability to relieve thermal stress; under complex working conditions, each layer complements each other, effectively preventing corrosion and erosion, maintaining the protection performance of the blades, extending the service life of the blades, and ensuring the efficient and stable operation of the steam turbine.

[0015] 2. The surface strengthening and erosion-resistant protection device for steam turbine blades significantly improves the strength of steam turbine blades. The high-strength metal protection net closely fits the blade body, and its material properties give the blade additional support force. Moreover, when the erosion-resistant protection structure peels or cracks, pulling the pull rod to compress the spring and pulling out the limit plug can be disassembled, ensuring the protection effect of the erosion-resistant protection structure and ensuring that the blades always maintain good performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic plan view of the present invention; Figure 2 is a schematic side view of the present invention; Figure 3 is a schematic view of the blade surface strengthening structure of the present invention; Figure 4 is a schematic view of the structure of the plug-in sleeve and the through sleeve of the present invention; Figure 5 For the present invention Figure 3 the enlarged schematic view of part A; Figure 6 is a schematic cross-sectional view of the blade surface strengthening structure and the erosion-resistant protection structure of the present invention; Figure 7 is a schematic view of the erosion-resistant protection structure of the present invention.

[0017] In the figure: 1. Blade body; 2. Blade crown; 3. Inner radial surface; 4. Blade root; 5. Blade surface strengthening structure; 501. High-strength metal protection net; 502. Plug-in sleeve; 503. Through sleeve; 504. Limit sleeve; 505. Limit box; 506. Limit plug; 507. Pull rod; 508. Spring; 6. Erosion-resistant protection structure; 601. Base bonding layer; 602. Transition layer; 603. Functional layer; 604. Top protective layer. DETAILED DESCRIPTION OF THE INVENTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] Please refer to Figure 1-7 , a surface strengthening and erosion-resistant protection device for a steam turbine blade, including a blade body 1, a blade crown 2 and an inner radial surface 3 are respectively fixedly installed at the top and bottom of the blade body 1, a blade root 4 is fixedly installed at the bottom of the inner radial surface 3, a blade surface strengthening structure 5 is movably installed outside the blade body 1, and an erosion-resistant protection structure 6 is fixedly installed on the outer surface of the blade surface strengthening structure 5; The blade surface strengthening structure 5 includes a high-strength metal protection net 501, a plugging sleeve 502, a through sleeve 503, a limiting sleeve 504, a limiting box 505, a limiting plug 506, a pull rod 507 and a spring 508. The high-strength metal protection net 501 is movably installed outside the blade body 1, the plugging sleeve 502 and the through sleeve 503 are fixedly installed on the outer surface of the high-strength metal protection net 501, the limiting sleeve 504 is fixedly installed at the top of the inner radial surface 3, the limiting box 505 is fixedly installed at the bottom of the inner radial surface 3, the limiting plug 506 and the pull rod 507 are slidably connected inside the limiting box 505, and the spring 508 is fixedly installed inside the limiting box 505; The erosion-resistant protection structure 6 includes a base bonding layer 601, a transition layer 602, a functional layer 603 and a top protection layer 604.

[0020] Embodiment 1: The design principle of the erosion-resistant protection structure 6 is based on the synergistic effect of multi-layer composite materials, aiming to provide an efficient, durable and complex working environment-adaptive protection system. This structure consists of four main parts: a base bonding layer 601, a transition layer 602, a functional layer 603 and a top protection layer 604; each layer has a specific function and realizes optimal performance through carefully selected materials and technical means.

[0021] I. Base bonding layer 601 Material: Epoxy resin Reinforcing agent: Silane coupling agent As the foundation of the entire erosion-resistant protection structure 6, the core task of the base bonding layer 601 is to ensure firm attachment to the high-strength metal protection net 501; epoxy resin is selected as the base material due to its excellent mechanical strength, chemical resistance and electrical insulation properties; the application of the silane coupling agent further enhances the chemical bonding between the epoxy resin and the metal surface, forming a strong and stable interface.

[0022] II. Transition layer 602 Material combination: nickel-based alloy + titanium carbide The transition layer 602 uses a mixture of nickel-based alloy and titanium carbide. The purpose is to significantly improve the overall toughness and impact resistance of the protective layer while maintaining good thermal conductivity. From a microscopic structure perspective, the nickel-based alloy particles act as bridges, tightly connecting the extremely hard titanium carbide particles together to form a uniformly distributed network structure. This not only improves the compatibility and mechanical response characteristics between materials but also plays a role in buffering external impact forces, reducing the pressure on the underlying more vulnerable substrate bonding layer 601, thereby extending the service life of the entire protection system.

[0023] III. Functional layer 603 Material: tungsten carbide WC The functional layer 603 selects tungsten carbide as the main component because this material has extremely high hardness and wear resistance, making it very suitable for resisting the erosion of solid particles in the high-speed steam flow inside the steam turbine. When the tiny particles carried by the steam impact the blade surface at high speed, the tungsten carbide layer can effectively absorb and disperse these impact energies, slowing down the speed of material wear.

[0024] IV. Top protective layer 604 Material: alumina (Al2O3) The top protective layer 604 is an alumina coating, which plays a crucial role in the entire protection structure. Alumina is a very stable compound and is not easily reactive with other substances, so it can effectively isolate the influence of external harmful factors on the internal structure. In addition, alumina also has good thermal conductivity and a low friction coefficient, which is crucial for maintaining the efficient operation of the steam turbine.

[0025] The erosion-resistant protection structure 6 realizes the effective protection of the steam turbine blades through the reasonable combination and precise construction of the above four layers of materials. Each layer is optimized for specific physical or chemical challenges and supports each other, jointly forming a multi-dimensional protection barrier. For example, the substrate bonding layer 601 ensures the stability of the overall structure; the transition layer 602 enhances the structural toughness; the functional layer 603 provides the key wear-resistant characteristics; and the top protective layer 604 enhances the corrosion resistance and thermal stability. Such a design not only solves the problem of insufficient comprehensive performance of traditional single coating materials but also greatly improves the service life and operation reliability of steam turbine blades under complex working conditions.

[0026] Example II: When the erosion-resistant protection structure 6 experiences spalling or cracking, a simple and effective mechanism is required to allow for the quick disassembly and replacement of the damaged protective layer to ensure that the steam turbine blade always remains in an optimal performance state. For this purpose, a detachable system based on the principle of mechanical locking and release is designed. This system mainly consists of a pull rod 507, a spring 508, and a limit plug rod 506, which work together to achieve the quick disassembly and assembly of the protection structure.

[0027] I. Initial installation: During the installation process, the high-strength metal protective net 501 is docked with the limit sleeves 504 on the blade crown 2 and the inner radial surface 3 through the insertion sleeves 502 and the through sleeves 503 thereon; The spring 508 inside each limit box 505 is in a natural state, pushing the limit plug rod 506 through the limit sleeve 504 and the through sleeve 503, and finally inserting it into the corresponding insertion sleeve 502; this layout ensures that the high-strength metal protective net 501 and the erosion-resistant protection structure 6 attached thereto are firmly fixed on the steam turbine blade.

[0028] The continuous pressure provided by the spring 508 keeps the limit plug rod 506 in the locked position, preventing any accidental movement or loosening.

[0029] I. Replacement of the erosion-resistant protection structure 6: The maintenance personnel pull the pull rod 507 outwards, and this action overcomes the elastic force of the spring 508, causing the limit plug rod 506 to withdraw from the insertion sleeve 502.

[0030] As the limit plug rod 506 is withdrawn, the originally fixed high-strength metal protective net 501 and the erosion-resistant protection structure 6 thereon lose their restraint and can be easily slid out axially to complete the disassembly process.

[0031] After disassembly, the maintenance personnel can choose to repair or replace the damaged part according to the specific situation; if only the surface coating is damaged, the corresponding protective layer can be reapplied after cleaning the surface; if there is a problem with the protective net itself, the entire component needs to be replaced.

[0032] When installing a new or repaired protection structure, just perform the above steps in reverse, that is, first place the high-strength metal protective net 501 in place, and then release the pull rod 507 to let the spring 508 automatically push the limit plug rod 506 into the insertion sleeve 502 to re-establish the locking relationship.

[0033] In summary, for the surface strengthening and erosion-resistant protection device of the steam turbine blade, the erosion-resistant protection structure 6 effectively makes up for the defects of traditional coatings; the base bonding layer 601 is based on epoxy resin and is tightly bonded to the high-strength metal protection net 501 through a silane coupling agent to ensure the overall stability; in the transition layer 602, the nickel-based alloy and titanium carbide act synergistically to enhance the structural toughness and erosion resistance; the tungsten carbide in the functional layer 603 resists erosion with high hardness and wear resistance; the alumina coating of the top protective layer 604 is corrosion-resistant and has strong thermal stability to relieve thermal stress; under complex working conditions, each layer complements each other, effectively preventing corrosion and erosion, maintaining the protection performance of the blade, extending the service life of the blade, and ensuring the efficient and stable operation of the steam turbine.

[0034] Moreover, for the surface strengthening and erosion-resistant protection device of the steam turbine blade, the blade surface strengthening structure 5 significantly improves the strength of the steam turbine blade; the high-strength metal protection net 501 closely fits the blade body 1, and its material properties give the blade additional supporting force; and when the erosion-resistant protection structure 6 peels or cracks, the pull rod 507 is pulled to compress the spring 508, and the limit insertion rod 506 is pulled out for disassembly, ensuring the protection effect of the erosion-resistant protection structure 6 and ensuring that the blade always maintains good performance, solving the problem that the comprehensive performance of traditional coating materials is insufficient and it is impossible to achieve the balance of high strength, high corrosion resistance and good wear resistance at the same time; secondly, during long-term operation, due to factors such as mismatched thermal expansion coefficients, the coating is prone to peeling or cracking, resulting in a significant reduction in the protection effect.

[0035] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the presence of additional identical elements in the process, method, article or device including the said element.

[0036] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A surface strengthening and erosion-resistant protection device for a steam turbine blade, comprising a blade body (1), characterized in that: The top and bottom of the blade body (1) are respectively fixedly installed with a blade shroud (2) and an inner radial surface (3). The bottom of the inner radial surface (3) is fixedly installed with a blade root (4). The outer part of the blade body (1) is movably installed with a blade surface strengthening structure (5). The outer surface of the blade surface strengthening structure (5) is fixedly installed with an erosion-resistant protection structure (6). The blade surface strengthening structure (5) includes a high-strength metal protection net (501), a plugging sleeve (502), a penetrating sleeve (503), a limiting sleeve (504), a limiting box (505), a limiting plug rod (506), a pull rod (507) and a spring (508). The outer part of the blade body (1) is movably installed with a high-strength metal protection net (501). The outer surface of the high-strength metal protection net (501) is fixedly installed with a plugging sleeve (502) and a penetrating sleeve (503). The top of the inner radial surface (3) is fixedly installed with a limiting sleeve (504). The bottom of the inner radial surface (3) is fixedly installed with a limiting box (505). The inside of the limiting box (505) is slidably connected with a limiting plug rod (506) and a pull rod (507). The inside of the limiting box (505) is fixedly installed with a spring (508). The erosion-resistant protection structure (6) includes a base bonding layer (601), a transition layer (602), a functional layer (603) and a top protective layer (604).

2. The surface strengthening and erosion-resistant protection device for a steam turbine blade according to claim 1, wherein: The bottom of the blade shroud (2) and the top of the inner radial surface (3) are both fixedly installed with limiting sleeves (504). One end of the high-strength metal protection net (501) is fixedly installed with two plugging sleeves (502). The other end of the high-strength metal protection net (501) is fixedly installed with two penetrating sleeves (503).

3. A steam turbine blade surface strengthening and erosion-resistant protection device according to claim 1, characterized in that: One penetrating sleeve (503) is attached to the outside of each limiting sleeve (504). One plugging sleeve (502) is attached to the side of each penetrating sleeve (503) away from the limiting sleeve (504). The top of the blade shroud (2) and the bottom of the inner radial surface (3) are both fixedly installed with limiting boxes (505).

4. A steam turbine blade surface strengthening and erosion-resistant protection device according to claim 1, characterized in that: The inside of each limiting box (505) is installed with a limiting plug rod (506), a pull rod (507) and a spring (508). The pull rod (507) is fixedly connected with the limiting plug rod (506). The spring (508) is sleeved on the outside of the pull rod (507).

5. The surface strengthening and erosion-resistant protection device for a steam turbine blade according to claim 1, wherein: One end of the spring (508) is fixedly connected with the inner wall of the limiting box (505). The other end of the spring (508) is fixedly connected with the limiting plug rod (506). The two limiting plug rods (506) respectively penetrate through the blade shroud (2) and the inner radial surface (3), as well as the two limiting sleeves (504) and the two penetrating sleeves (503) and are plugged into the two plugging sleeves (502).

6. The surface strengthening and erosion-resistant protection device for a steam turbine blade according to claim 1, wherein: The material of the base bonding layer (601) is epoxy resin, and the base bonding layer (601) is connected to the outer surface of the high-strength metal protection net (501) through a silane coupling agent.

7. A surface strengthening and erosion-resistant protection device for a steam turbine blade according to claim 1, characterized in that: The transition layer (602) is fixedly installed on the top of the base bonding layer (601), and the transition layer (602) is prepared by combining a nickel-based alloy and titanium carbide.

8. A steam turbine blade surface strengthening and erosion-resistant protection device according to claim 1, characterized in that: The functional layer (603) is fixedly installed on the top of the transition layer (602), and the material of the functional layer (603) is tungsten carbide.

9. A steam turbine blade surface strengthening and erosion-resistant protection device according to claim 1, characterized in that: The top protective layer (604) is disposed on the top of the functional layer (603), and the top protective layer (604) is an alumina coating.

Images