Impeller and impeller repair method

Abstract

This invention relates to the field of impact resistance technology, and more particularly to an impeller comprising blades (4), the blades (4) comprising a base (1) and a protective layer (2), an attachment structure (3) being provided on the mounting surface (101) of the base (1), the attachment structure (3) protruding from the mounting surface (101), forming a receiving space (303) between the attachment structure (3) and the mounting surface (101), and the protective layer (2) forming an interlocking portion (2011) embedded in the receiving space (303). Furthermore, this invention also provides an impeller repair method. The impeller of this invention has high adhesion of the protective layer, long service life, and low maintenance cost.

Description

Technical Field

[0001] This invention relates to the field of impact resistance technology, specifically to an impeller. Furthermore, it also relates to a method for impeller repair. Background Technology

[0002] In the preparation process of anhydrous magnesium chloride granules, the hydrogen chloride drying and circulation system is the core recycling unit, and the hydrogen chloride compressor is the key equipment for pressurizing the system. Centrifugal impellers are commonly used. During the production process, the centrifugal impellers often operate at a high speed of 6500 r / min, and the working medium of the centrifugal impellers is wet hydrogen chloride gas containing trace amounts of magnesium chloride droplets. Therefore, the blades of the centrifugal impellers are subjected to harsh conditions of strong corrosion, high-speed erosion, and alternating loads.

[0003] To prevent impeller blades from corroding under the impact of corrosive droplets, resulting in blade thinning, pitting, and cracking, existing impellers are coated with a corrosion-resistant coating. However, due to the poor adhesion of the coating, after a period of high-intensity operation, the coating is prone to delamination or localized bulging and peeling off under the action of high-speed centrifugal force. This leads to a significant decrease in the impeller's corrosion resistance, greatly reducing its service life, lowering production safety, and increasing maintenance costs.

[0004] In view of this, it is necessary to design an impeller that can overcome the above-mentioned technical difficulties and effectively solve or alleviate the above-mentioned technical defects. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an impeller with a protective layer that has high adhesion, long service life and low maintenance cost.

[0006] The technical problem to be solved by the present invention is to provide an impeller repair method, which results in an impeller with a protective layer that has high adhesion, long service life, and low maintenance cost after repair.

[0007] To solve the above-mentioned technical problems, the present invention provides an impeller, which includes blades, each blade including a base and a protective layer. An attachment structure is provided on the mounting surface of the base, the attachment structure protruding from the mounting surface, and a receiving space is formed between the attachment structure and the mounting surface. The protective layer forms an interlocking portion, which is embedded in the receiving space.

[0008] Preferably, the attachment structure includes a connecting portion and an attachment reinforcement portion. The attachment reinforcement portion has an attachment reinforcement surface facing the mounting surface. One end of the connecting portion is connected to the mounting surface, and the other end of the connecting portion is connected to one end of the attachment reinforcement portion. The attachment reinforcement portion extends in a direction opposite to the direction of the centrifugal force of the blade. The surfaces of the attachment reinforcement portion and the connecting portion opposite to the direction of the centrifugal force of the blade serve as stop portions. The attachment reinforcement surface, the connecting portion, and the mounting surface together form the receiving space.

[0009] Preferably, the attachment reinforcement is an attachment reinforcement plate, and the two corners of the attachment reinforcement plate at the end away from the connecting part are both rounded.

[0010] Preferably, the attachment structure includes an attachment reinforcement and at least two connecting parts, one end of each connecting part is connected to the mounting surface, and the other end of each connecting part is connected to the attachment reinforcement. The side surfaces of the attachment reinforcement and the connecting parts opposite to the direction of the centrifugal force of the blade's rotation serve as stop parts. The attachment reinforcement, the mounting surface, and the two connecting parts together form the receiving space.

[0011] Preferably, the attachment reinforcement surface is parallel to the mounting surface, and the relationship between the distance H from the attachment reinforcement surface to the mounting surface and the minimum thickness δ of the blade is: H = (0.15~0.25)δ.

[0012] Preferably, the protective layer includes an anti-corrosion layer and an anti-cracking layer, the anti-corrosion layer is disposed on the mounting surface, the anti-corrosion layer has the interlocking portion formed thereon, and the anti-cracking layer is disposed on the side of the anti-corrosion layer away from the mounting surface.

[0013] Based on the above-mentioned impeller technical solution, the present invention also provides an impeller repair method, which includes the following steps: (A) Remove the coating from the surface of the substrate; (B) A plurality of the aforementioned attachment structures are processed on the surface of the substrate; (C) Adhere the protective layer to the surface of the substrate.

[0014] Preferably, step B further includes: the relationship between the spacing L between two adjacent attachment structures and the radius of curvature ρ of the blade is expressed as: k is 8-12.

[0015] Preferably, the substrate surface is processed to achieve a surface roughness Ra ≥ 6.3 μm.

[0016] Preferably, step B further includes: increasing the adhesion area of ​​the protective layer. The relationship between the number of the attached structures and the formula is: Where n is the number of the attachment structures, The contact area between the attachment structure and the mounting surface. The surface area of ​​the protective layer, and the adhesion area improvement rate of the protective layer. ≥35%.

[0017] Through the above technical solution, an attachment structure is formed on the base of the impeller of the present invention, and an accommodating space is formed between the attachment structure and the mounting surface. An interlocking part is formed on the side of the protective layer near the mounting surface. The interlocking part is embedded in the accommodating space so that the protective layer and the attachment structure interlock with each other, thereby improving the adhesion of the protective layer, making the protective layer less likely to fall off, allowing the protective layer to protect the base for a longer time, extending the service life of the impeller, and reducing maintenance costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the impeller structure according to a specific embodiment of this application; Figure 2 This is a schematic diagram of the structure of the blade substrate according to a specific embodiment of this application; Figure 3 This is a schematic diagram of the attachment structure according to a specific embodiment of this application; Figure 4 This is a schematic diagram of the attachment structure according to another specific embodiment of this application; Figure 5 This is a structural schematic diagram of the cross-section of the blade according to a specific embodiment of this application.

[0019] Explanation of reference numerals in the attached figures 1. Substrate; 101. Mounting surface; 2. Protective layer; 201. Anti-corrosion layer; 2011. Engaging part; 202. Crack-resistant layer; 3. Attachment structure; 301. Stop part; 302. Attachment reinforcement part; 3021. Attachment reinforcement surface; 303. Accommodation space; 304. Connecting part; 4. Blade; 5. Rotating shaft. Detailed Implementation

[0020] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of the present invention by way of example, but should not be used to limit the scope of the present invention. The present invention can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0021] These embodiments are provided to make the invention thorough and complete, and to fully express the scope of the invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0022] It should be noted that, in the description of this invention, unless otherwise stated, words such as "comprising" or "including" mean that the element preceding the word covers the element listed after the word, and do not exclude the possibility of covering other elements as well.

[0023] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0024] All terms used in this invention have the same meaning as understood by one of ordinary skill in the art to which this invention pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0025] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0026] like Figures 1 to 5As shown, the impeller of the present invention includes blades 4, each blade including a base 1 and a protective layer 2. An attachment structure 3 is provided on the mounting surface 101 of the base 1, protruding from the mounting surface 101. A receiving space 303 is formed between the attachment structure 3 and the mounting surface 101. An interlocking portion 2011 is formed on the side of the protective layer 2 near the mounting surface 101, and the interlocking portion 2011 is embedded in the receiving space 303, so that the attachment structure 3 and the protective layer 2 interlock together, thereby improving the adhesion of the protective layer 2. This allows the protective layer 2 to adhere to the base 1 for a longer period under high-speed operating conditions, extending the time the protective layer 2 protects the base 1, thus extending the service life of the impeller and reducing maintenance costs. The protective layer 2 of the present invention can be an anti-corrosion layer 201 made of anti-corrosion material, an anti-wear layer made of wear-resistant material, or other protective layers 2 required by the base 1. In some embodiments, the attachment structure 3 is formed on the entire impeller, and the protective layer 2 is interlocked with the attachment structure to achieve overall protection of the impeller.

[0027] In a preferred embodiment, the adhesion structure 3 of the present invention may include an adhesion reinforcement portion 302, which has an adhesion reinforcement surface 3021 facing the mounting surface 101. After the adhesion structure 3 and the protective layer 2 are pressed together, the adhesion reinforcement surface 3021 can provide a force towards the mounting surface 101 to the protective layer 2 when the blade 4 rotates at high speed, thereby further improving the adhesion of the protective layer 2, extending the service life of the impeller, and reducing maintenance costs. In some specific embodiments, the adhesion structure 3 may be an arc-shaped structure extending obliquely outward from the mounting surface 101, with the inner surface of the arc-shaped structure being the adhesion reinforcement surface 3021 facing the mounting surface 101. This allows the inner surface of the arc-shaped structure to provide a force towards the mounting surface 101 to the protective layer 2 when the blade 4 rotates at high speed, thereby improving the adhesion of the protective layer 2, extending the service life of the impeller, and reducing maintenance costs.

[0028] As a preferred implementation method, such as Figure 3As shown, the adhesion structure 3 may include a connecting portion 304 and an adhesion reinforcement portion 302. The adhesion reinforcement portion 302 has an adhesion reinforcement surface 3021 facing the mounting surface 101. One end of the connecting portion 304 is connected to the mounting surface 101, and the other end of the connecting portion 304 is connected to one end of the adhesion reinforcement portion 302. The adhesion reinforcement portion 302 extends in a direction opposite to the direction a of the centrifugal force of the blade 4. The surfaces of the adhesion reinforcement portion 302 and the connecting portion 304 opposite to the direction a of the centrifugal force of the blade 4 serve as a stop portion 301. The adhesion reinforcement surface 3021, the connecting portion 304, and the mounting surface 101 together form a receiving space 303. This adhesion structure 3, through the adhesion reinforcement portion 302, provides a force towards the mounting surface 101 to the protective layer 2 when the blade 4 rotates at high speed, thereby improving the adhesion of the protective layer 2, extending the service life of the impeller, and reducing maintenance costs. The stop portion 301 can prevent the protective layer 2 from rotating relative to the mounting surface 101 during the rotation of the blade 4. At the same time, during the high-speed rotation of the blade 4, the centrifugal force of the blade 4 can further wedge the interlocking portion 2011 of the protective layer 2 into the receiving space 303, forming a self-locking effect and further improving the adhesion of the protective layer 2. The adhesion structure 3 of this embodiment is relatively simple to process and can resist shear loads well.

[0029] In a preferred embodiment, the attachment reinforcement 302 can be an attachment reinforcement plate, and the two corners of the end of the attachment reinforcement plate away from the connection portion 304 are both formed with rounded corners to eliminate stress concentration and reduce turbulence.

[0030] As another preferred implementation, such as Figure 4 As shown, the attachment structure 3 also includes an attachment reinforcement 302 and at least two connecting parts 304. One end of each connecting part 304 is connected to the mounting surface 101, and the other end of each connecting part 304 is connected to the attachment reinforcement 302. The side surfaces of the attachment reinforcement 302 and the connecting parts 304 opposite to the direction a of the centrifugal force of the blade 4 serve as stop parts 301. The attachment reinforcement 302, the mounting surface 101, and the two connecting parts 304 together form a receiving space 303. The stop part 301 can prevent the protective layer 2 from rotating relative to the mounting surface 101 during the rotation of the blade 4. At the same time, during the high-speed rotation of the blade 4, the centrifugal force of the blade 4 can further wedge the interlocking part 2011 of the protective layer 2 into the receiving space 303, forming a self-locking effect and further improving the adhesion of the protective layer 2.

[0031] In a preferred embodiment, the attachment reinforcement surface 3021 is parallel to the mounting surface 101. The relationship between the distance H from the attachment reinforcement surface 3021 to the mounting surface 101 and the minimum thickness δ of the blade 4 is: H = (0.15~0.25)δ, so that the substrate 1 and the attachment structure 3 have sufficient structural strength to meet the high-speed rotation fatigue requirements, while ensuring that the protective layer 2 is stably attached to the mounting surface 101 and extending the service life of the impeller. The thickness of the blade 4 is the sum of the thicknesses of the substrate 1 and the protective layer 2. The value can be taken between 0.15 and 0.25 according to the impeller speed under actual working conditions. The working speed of the impeller is positively correlated with the distance H. When the working speed of the impeller is higher, the pull-out force on the attachment structure 3 is larger, and the distance H can be taken as a larger value to improve the adhesion of the protective layer 2.

[0032] As a preferred implementation method, such as Figure 2 As shown, multiple attachment structures 3 are formed on the mounting surface 101. The relationship between the spacing L between adjacent attachment structures 3 and the radius of curvature ρ of the blade 4 is as follows: k is 8-12. By adjusting the distribution density of the attachment structures 3, the adhesion force provided by the attachment structures 3 is matched to the separation force of the blades 4 with different curvatures. The value of k is taken between 8 and 12 based on the impeller's rotational speed under actual operating conditions. For impellers with higher operating speeds, k takes a larger value, and for impellers with lower operating speeds, k takes a smaller value. In some embodiments, the impeller includes a shaft 5, and the blades are arranged circumferentially along the shaft 5. This allows the distribution density of the attachment structures 3 on the inlet surface of the blades 4 to be greater than the distribution density on the outlet surface of the blades 4, and the distribution density of the attachment structures 3 on the blades 4 away from the shaft 5 to be greater than the distribution density of the attachment structures 3 on the blades 4 closer to the shaft 5, so that the distribution of the adhesion force provided by the attachment structures 3 further matches the distribution of the impeller's separation force. Multiple attachment structures 3 can be arranged in a streamlined manner to reduce eddies.

[0033] In a preferred embodiment, the protective layer 2 includes an anti-corrosion layer 201, which is disposed on the mounting surface 101. The anti-corrosion layer 201 is made of an anti-corrosion material and has interlocking portions 2011. The adhesion structure 3 of the present invention improves the adhesion of the anti-corrosion layer 201, thus enabling the impeller in this embodiment to maintain high-intensity operation and adhere to the substrate 1 for a longer period without detaching when used in the preparation of anhydrous magnesium chloride granules or other working environments with highly corrosive media. This prevents corrosion of the substrate 1, extends the impeller's service life, and reduces maintenance costs. In other embodiments, the protective layer 2 of this application may also be a wear-resistant layer or a protective layer 2 that provides other protection to the substrate 1.

[0034] In a preferred embodiment, a plurality of attachment structures 3 are formed on the mounting surface 101. The protective layer 2 is attached to the substrate 1 through the plurality of attachment structures 3. The plurality of attachment structures 3 can increase the attachment area of ​​the protective layer 2, thereby increasing the attachment area improvement rate of the protective layer 2. The relationship between the number of attached structures 3 and the formula is: Where n is the number of attachment structures 3. The contact area between the attachment structure 3 and the mounting surface 101. The surface area of ​​the protective layer 2 is determined by adjusting the number of attachment structures 3 and the contact area between each attachment structure 3 and the mounting surface 101. ≥35%, thereby increasing the adhesion of the protective layer 2 by nearly three times, making it less prone to detachment when the impeller operates at a speed of 6500 r / min. In some embodiments where the protective layer 2 has a multi-layer structure, The surface area of ​​the layer that is attached to the mounting surface 101 via the attachment structure 3, which is in contact with the mounting surface 101, for example, when the protective layer 2 includes an anti-corrosion layer 201 and a crack-resistant layer 202, The surface area of ​​the anti-corrosion layer 201.

[0035] In a preferred embodiment, the surface of the substrate 1 can be sandblasted to make the surface roughness Ra≥6.3μm. The anti-corrosion layer 201 can be bonded to the mounting surface 101 with an adhesive to further improve the adhesion between the protective layer 2 and the substrate 1 and extend the service life of the impeller.

[0036] In a preferred embodiment, the protective layer 2 further includes a crack-resistant layer 202. The crack-resistant layer 202 is disposed on the side of the anti-corrosion layer 201 away from the mounting surface 101. The crack-resistant layer 202 can be made of vinyl ester resin and fiberglass composite. The crack-resistant layer 202 uniformly covers the impeller surface and edges to prevent cracking at the edges of the anti-corrosion layer 201. With the dual protection of the anti-corrosion layer 201 and the crack-resistant layer 202, the erosion corrosion rate of the impeller can be reduced by 60%, further extending the impeller's service life.

[0037] In addition to directly manufacturing the impeller of this invention, it is also possible to perform anti-corrosion repair on the basis of an existing impeller with completely or partially peeled off anti-corrosion coating, and process it into the impeller of this application. Taking the repair of a hydrogen chloride compressor impeller as an example, in some embodiments, the steps of the anti-corrosion repair process are as follows: 1. First, remove the failed coating and oxide layer from the impeller surface to expose the substrate 1. Then, process the attachment structure 3 on the substrate 1. Ensure that the relationship between the distance H from the attachment reinforcement surface 3021 to the mounting surface 101 of the processed attachment structure 3 and the minimum thickness δ of the blade 4 is: H = (0.15~0.25)δ. 2. Clean and dry the processed substrate 1; 3. Adhere the anti-corrosion layer 2 to the substrate using adhesive.

[0038] In some specific embodiments, step 1 can be performed by mechanical sandblasting with 80-mesh corundum abrasive to remove the failed rubber lining and oxide layer, so that the surface of the substrate 1 presents a uniform metallic color. The distance H between the processed attachment structures 3 is 3mm, and the spacing between adjacent attachment structures 3 is 15mm. In step 2, acetone can be used to wipe the oil stains on the surface of the substrate 1. After drying, the surface roughness of the substrate 1 is Ra7.2μm. In step 3, E-44 type epoxy resin and curing agent can be mixed in a 5:1 ratio. After stirring evenly, the impeller surface coating can be completed within 30 minutes. The anti-corrosion layer 201 is made of hydrochloric acid resistant rubber. The anti-corrosion layer 201 is attached to the surface of the substrate 1 using a vacuum suction cup. A pressure of 0.3MPa is applied by a hydraulic device. During the bonding process, a pressure sensor can be used to monitor the bonding pressure in real time to avoid bubble defects caused by uneven local pressure. After bonding, it is placed in a constant temperature oven and cured at 80℃±5℃ for 4 hours. The corrosion repair process may also include step 4: After the anti-corrosion layer 201 has cured, apply vinyl ester resin to the surface of the anti-corrosion layer 201, and then lay fiberglass cloth layer by layer to form a 2mm thick crack-resistant layer 202. After curing at room temperature for 24 hours, polish the surface of the crack-resistant layer 202 until it is smooth and flat. The corrosion repair process may also include step 5: Calibrate the impeller using a dynamic balancing testing machine, achieving a dynamic balancing accuracy of G2.0 at a speed of 6500r / min; test the adhesion of the anti-corrosion layer using the pull-out method, which shows 17N / mm²; and conduct a water pressure test at 1.5 times the design pressure for 30 minutes without leakage. The impeller repaired by the above corrosion repair process has an adhesion ≥15N / mm, which can withstand the scouring corrosion of media containing droplets of hydrogen chloride for a long time, reducing the number of unplanned shutdowns of the hydrogen chloride compressor and lowering maintenance costs.

[0039] like Figures 1 to 5 As shown, the present invention provides a preferred impeller, which includes blades 4, each blade including a base 1 and a protective layer 2. A plurality of attachment structures 3 are disposed on the mounting surface 101 of the base 1, the attachment structures 3 protruding from the mounting surface 101. The spacing L between adjacent attachment structures 3 is adjusted according to the radius of curvature ρ of the blades 4, and the relationship between the spacing L between adjacent attachment structures 3 and the radius of curvature ρ of the blades 4 is given by the following formula: The attachment structure 3 includes an attachment reinforcement 302 and a connecting portion 304. The attachment reinforcement 302 has an attachment reinforcement surface 3021 facing the mounting surface 101. One end of the connecting portion 304 is connected to the mounting surface 101, and the other end of the connecting portion 304 is connected to one end of the attachment reinforcement 302. The attachment reinforcement 302 extends in a direction opposite to the direction a of the centrifugal force of the blade 4. The side surfaces of the attachment reinforcement 302 and the connecting portion 304 opposite to the direction a of the centrifugal force of the blade 4 serve as stop portions 301. The two corners of the end of the attachment reinforcement 302 away from the connecting portion 304 form a rounded corner structure to eliminate stress concentration and reduce turbulence. The attachment reinforcement 302, the mounting surface 101, and the connecting part 304 enclose and form a receiving space 303. The protective layer 2 includes an anti-corrosion layer 201 and an anti-cracking layer 202. An interlocking part 2011 is formed on the side of the anti-corrosion layer 201 near the mounting surface 101. The roughness Ra of the mounting surface 101 is ≥6.3μm. The anti-corrosion layer 201 is bonded to the mounting surface 101 with an adhesive. The interlocking part 2011 is embedded in the receiving space 303. The anti-cracking layer 202 is made of vinyl ester resin fiberglass material and is coated on the side of the anti-corrosion layer 201 away from the mounting surface 101. The anti-corrosion layer 201 can prevent the impeller from being corroded. The anti-cracking layer 202 can prevent the edge of the anti-corrosion layer 201 from cracking. The anti-corrosion layer 201 and the anti-cracking layer 202 protect the impeller under strong corrosion and droplet erosion conditions. The adhesion reinforcement 302 can improve the adhesion of the anti-corrosion layer 201, and the anti-corrosion layer 201 will be further wedged when the impeller rotates, further improving the adhesion of the anti-corrosion layer 201, reducing the risk of the protective layer 2 falling off after long-term high-speed rotation, extending the service life of the impeller, and reducing the maintenance cost of the impeller.

[0040] As can be seen from the above description, the advantages of the present invention are as follows: First, the attachment structure forms a space for the interlocking part 2011 of the protective layer 2 to be embedded, so that the protective layer and the attachment structure interlock with each other, improving the adhesion of the protective layer, extending the service life of the impeller, and reducing maintenance costs; Second, when the impeller rotates at high speed, the interlocking part 2011 will be further wedged, forming a self-locking effect, further improving the adhesion of the protective layer, extending the service life of the impeller, and reducing maintenance costs; Third, the use of dual protection of anti-corrosion layer and anti-cracking layer further extends the service life of the impeller and reduces maintenance costs.

[0041] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0042] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0043] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. An impeller comprising blades (4), characterized in that, The blade (4) includes a base (1) and a protective layer (2). An attachment structure (3) is provided on the mounting surface (101) of the base (1). The attachment structure (3) protrudes from the mounting surface (101). A receiving space (303) is formed between the attachment structure (3) and the mounting surface (101). The protective layer (2) forms an interlocking part (2011). The interlocking part (2011) is embedded in the receiving space (303).

2. The impeller according to claim 1, characterized in that, The attachment structure (3) includes a connecting part (304) and an attachment reinforcement part (302). The attachment reinforcement part (302) has an attachment reinforcement surface (3021) facing the mounting surface (101). One end of the connecting part (304) is connected to the mounting surface (101), and the other end of the connecting part (304) is connected to one end of the attachment reinforcement part (302). The attachment reinforcement part (302) extends in a direction opposite to the direction of the centrifugal force of the blade (4). The side surfaces of the attachment reinforcement part (302) and the connecting part (304) opposite to the direction of the centrifugal force of the blade (4) serve as a stop part (301). The attachment reinforcement surface (3021), the connecting part (304), and the mounting surface (101) together form the receiving space (303).

3. The impeller according to claim 2, characterized in that, The attachment reinforcement part (302) is an attachment reinforcement plate, and the two corners of the end of the attachment reinforcement plate away from the connecting part (304) are both formed with rounded corners.

4. The impeller according to claim 1, characterized in that, The attachment structure (3) includes an attachment reinforcement (302) and at least two connecting parts (304). One end of each connecting part (304) is connected to the mounting surface (101), and the other end of each connecting part (304) is connected to the attachment reinforcement (302). The side surfaces of the attachment reinforcement (302) and the connecting parts (304) opposite to the direction of the centrifugal force of the blade (4) serve as stop parts (301). The attachment reinforcement (302), the mounting surface (101), and the two connecting parts (304) together form the receiving space (303).

5. The impeller according to any one of claims 2 to 4, characterized in that, The attachment reinforcement surface (3021) is parallel to the mounting surface (101), and the relationship between the distance H from the attachment reinforcement surface (3021) to the mounting surface (101) and the minimum thickness δ of the blade (4) is: H = (0.15~0.25)δ.

6. The impeller according to any one of claims 1 to 4, characterized in that, The protective layer (2) includes an anti-corrosion layer (201) and an anti-crack layer (202). The anti-corrosion layer (201) is disposed on the mounting surface (101) and the interlocking portion (2011) is formed on the anti-corrosion layer (201). The anti-crack layer (202) is disposed on the side of the anti-corrosion layer (201) away from the mounting surface (101).

7. A method for repairing an impeller, characterized in that, For forming an impeller according to any one of claims 1 to 6, the following steps are included: (A) Remove the coating from the surface of the substrate (1); (B) A plurality of the attachment structures (3) are processed on the surface of the substrate (1); (C) The protective layer (2) is bonded to the surface of the substrate (1).

8. The impeller repair method according to claim 7, characterized in that, Step B further includes: the relationship between the spacing L between two adjacent attachment structures (3) and the radius of curvature ρ of the blade (4) is: k is 8-12.

9. The impeller repair method according to claim 7, characterized in that, Step C further includes: processing the surface of the substrate (1) to make the surface roughness Ra of the substrate (1) ≥ 6.3 μm.

10. The impeller repair method according to claim 7, characterized in that, Step B further includes: increasing the adhesion area of ​​the protective layer (2). The relationship between the number of the attached structures (3) and the number of the attached structures is as follows: Where n is the number of the attachment structures (3), The contact area between the attachment structure (3) and the mounting surface (101) is... The surface area of ​​the protective layer (2) and the adhesion area improvement rate of the protective layer (2) ≥35%.

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