Manufacturing method of impeller of propeller and impeller

Abstract

The invention provides a manufacturing method of an impeller of a propeller and the impeller, and belongs to the field of ship propellers. The manufacturing method comprises the steps that an integrated structural part is provided, the integrated structural part comprises a hub body and a plurality of blades, the blades are evenly arranged along the periphery of the hub body at intervals, and one end of each blade is connected with the periphery of the hub body; the blades are sleeved with an outer ring frame, and the outer ring frame and the hub body are made to be coaxial; and the inner wall of the outer ring frame and the other ends of the multiple blades are welded together, and the impeller is obtained. The machining precision of the impeller can be improved.

Description

Technical Field

[0001] The present invention belongs to the field of ship propellers, and in particular relates to a method for manufacturing an impeller of a propeller and the impeller. Background Art

[0002] The impeller is an important structure of the propeller. The impeller generally includes an outer ring frame, a plurality of blades and a hub body. The outer ring frame is located outside the hub body, and the plurality of blades are located between the outer ring frame and the hub body, and are connected to the outer ring frame and the hub body respectively.

[0003] In the related art, the impeller is usually manufactured by casting and grinding. After the impeller blank is obtained by demoulding, the impeller blank is subjected to machining such as grinding so that all dimensions of the impeller can meet the design requirements.

[0004] However, for larger impellers, casting is more difficult and the casting process is difficult to control. The connection parts between the blades and the outer ring frame and between the blades and the hub are prone to casting defects such as porosity and looseness, which affect the quality of the impeller and result in poor precision of the processed impeller. Summary of the invention

[0005] The disclosed embodiment provides a method for manufacturing an impeller of a propeller and an impeller, which can improve the processing accuracy of the impeller and help further improve the propulsion efficiency of the propeller. The technical solution is as follows:

[0006] An embodiment of the present disclosure provides a method for manufacturing an impeller, the method comprising: providing an integral structural component, the integral structural component comprising a hub body and a plurality of blades, the plurality of blades being evenly spaced along the outer circumference of the hub body, and one ends of the plurality of blades being connected to the outer circumference of the hub body; putting an outer ring frame over the plurality of blades, and making the outer ring frame coaxial with the hub body; and welding the inner walls of the outer ring frame to the other ends of the plurality of blades, respectively, to obtain the impeller.

[0007] In another implementation of the present disclosure, providing an integrated structural part includes: integrally molding a blank of the integrated structural part, the outer shape of the blank having a processing allowance of not less than 3 mm, and a slag removal area being provided at one end of the blank facing radially outward; processing the outer surface of the blank, and removing the slag removal area of ​​the blank to obtain the integrated structural part.

[0008] In yet another implementation of the present disclosure, along the radial direction of the blade, the length of the slag discharge zone is not less than 15 mm.

[0009] In another implementation of the present disclosure, the method further includes: curling the metal sheet into a circular ring structure and welding the butt joints of the metal sheet together; and machining the inner hole of the circular ring structure so that the inner hole matches the integral structural member.

[0010] In another implementation of the present disclosure, after the outer ring frame is sleeved outside the plurality of blades, the manufacturing method further includes:

[0011] The axial position of the outer ring frame relative to the blades is adjusted so that each of the plurality of blades is at the same distance from both ends of the outer ring frame.

[0012] In another implementation of the present disclosure, the inner wall of the outer ring frame and the multiple blades are welded together to obtain the impeller, including: welding the middle part of the blade tip of each blade to the inner wall of the outer ring frame through a laser welding process; and using argon arc welding to weld all the blade tips to the inner wall of the outer ring frame.

[0013] In another implementation of the present disclosure, after welding the inner wall of the outer ring frame and the plurality of blades together, the manufacturing method further includes: finishing the outer surface of the blade, the inner wall and the outer surface of the outer ring frame respectively.

[0014] In another implementation of the present disclosure, an impeller is also provided, which is processed by the manufacturing method described above, and includes an integral structural part and an outer ring frame. The integral structural part includes a plurality of blades and a hub body, and the plurality of blades are connected outside the hub body at uniform intervals along the outer circumference of the hub body. The outer ring frame is located outside the plurality of blades and is coaxially arranged with the hub body, and the inner walls of the outer ring frame are respectively welded to the plurality of blades.

[0015] In yet another implementation of the present disclosure, the integrated structural component is a copper alloy casting structural component.

[0016] In yet another implementation of the present disclosure, the outer ring frame is an annular copper alloy structure.

[0017] The technical solution provided by the embodiments of the present disclosure has the following beneficial effects:

[0018] Since the multiple blades and the hub body in the above impeller are processed as an integrated structural part, the connection strength between the blades and the hub body can be improved by the integrated structural part, and at the same time, the outer ring frame can be avoided from being processed as one piece, thereby reducing the processing difficulty. At the same time, it can also avoid the influence of the sudden change of the cross section at the connection part between the outer ring frame and the multiple blades during the integrated casting process on the casting quality, thereby improving the quality of the impeller.

[0019] In addition, processing the outer ring frame separately can also effectively improve the internal quality of the outer ring frame. Moreover, the one-piece structural part is connected to the outer ring frame by welding, which fully retains the advantages of each and avoids the quality risks brought by integral casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of the structure of an impeller provided in an embodiment of the present disclosure;

[0022] Figure 2 yes Figure 1 Schematic diagram of the axial cross-section structure;

[0023] Figure 3 is a flow chart of a method for manufacturing an impeller of a propeller provided in an embodiment of the present disclosure;

[0024] Figure 4 is a flow chart of another method for manufacturing an impeller of a propeller provided by an embodiment of the present disclosure;

[0025] Figure 5 A schematic structural diagram of a blank of an integrated structural component provided in an embodiment of the present disclosure;

[0026] Figure 6 A schematic diagram of the structure of an integrated structural member provided in an embodiment of the present disclosure;

[0027] Figure 7 for Figure 6 Axial cross-section of

[0028] Figure 8 A schematic diagram of processing the outer ring frame provided in an embodiment of the present disclosure;

[0029] Fig. 9 A schematic diagram of the assembly of the outer ring frame and the integral structural member provided in an embodiment of the present disclosure.

[0030] The symbols in the figure mean the following:

[0031] 100. Integral structural parts;

[0032] 101, hub body;

[0033] 102, blade; 1021, slag discharge area;

[0034] 200, outer ring frame;

[0035] 201. Butt joints. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0037] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons with ordinary skills in the field to which the present disclosure belongs. The words "first", "second", "third" and similar words used in the patent application specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limitation, but indicate the existence of at least one. Words such as "include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right", "top", "bottom" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0038] Figure 1 The schematic diagram of the structure of the impeller provided in the embodiment of the present disclosure, combined with Figure 1 The impeller includes a hub body 101, a plurality of blades 102 and an outer ring frame 200. The outer ring frame 200 is coaxially sleeved outside the hub body 101, and the plurality of blades 102 are arranged at intervals along the circumference of the hub body 101 and are all located between the hub body 101 and the outer ring frame 200, and each blade 102 is connected to the hub body 101 and the outer ring frame 200 respectively.

[0039] The hub body 101 mainly bears the weight of the impeller and supports the structure of the entire impeller, while transmitting the thrust generated by the blades 102 .

[0040] The blades 102 mainly rotate to generate thrust under the drive of the outer ring frame 200, and connect the hub body 101 and the outer ring frame 200. The outer ring frame 200 is the part where the motor rotor is integrated. The motor rotor and the outer ring frame 200 are assembled together to form a whole. The rotation of the rotor and the outer ring frame 200 drives the entire impeller to rotate.

[0041] The outer ring frame 200 is a circular ring frame structure.

[0042] The impeller is the main force-bearing component in the electric propulsion device. When working, its outer circular chamber will be subjected to alternating water pressure. Moreover, when the impeller is running, the connection between the blade 102 and the outer ring frame 200 will also be subjected to the thrust generated by it. Therefore, in the impeller, the connection between the blade 102 and the hub body 101, and the connection between the blade 102 and the outer ring frame 200 are important force-bearing parts. When manufacturing the blade 102, the manufacturing quality requirements are very high, and no excessive internal defects are allowed. However, the impeller is processed in one piece using the casting method described in the relevant technology, which is very likely to cause casting defects such as pores and looseness in the connection between the blade and the outer ring frame and the blade and the hub body in the impeller, affecting the quality of the impeller and resulting in poor precision of the processed impeller.

[0043] The impeller in the embodiment of the present disclosure is a copper alloy structural part.

[0044] Figure 2 yes Figure 1 Schematic diagram of the axial cross-section structure, combined with Figure 2 , a schematic structural diagram of an impeller of a propeller provided in an embodiment of the present disclosure. The impeller includes an integral structural member 100 and an outer ring frame 200 .

[0045] The integrated structural member 100 includes a plurality of blades 102 and a hub body 101 . The plurality of blades 102 are evenly spaced along the outer circumference of the hub body 101 , and one end of each blade 102 is connected to the outer circumference of the hub body 101 .

[0046] The outer ring frame 200 is sleeved outside the plurality of blades 102 and is coaxially arranged with the hub body 101 . The inner wall of the outer ring frame 200 is welded to the plurality of blades 102 respectively.

[0047] Since the multiple blades 102 and the hub body 101 in the above impeller are processed as an integrated structural part, the integrated structural part 100 can be used to improve the connection strength between the blades 102 and the hub body 101, while avoiding the need to process the outer ring frame 200 as an integral part, thereby reducing the difficulty of processing. At the same time, it can also avoid the influence of the sudden change of the cross section at the connection part between the outer ring frame 200 and the multiple blades 102 during the integral casting process on the casting quality, thereby improving the quality of the impeller.

[0048] In addition, processing the outer ring frame 200 separately can also effectively improve the internal quality of the outer ring frame 200. Moreover, the integral structural member 100 is connected to the outer ring frame 200 by welding, which fully retains the advantages of each and avoids the quality risk caused by integral casting.

[0049] Optionally, the outer ring frame 200 is a copper alloy annular structure.

[0050] The outer ring frame 200 is configured as a copper alloy annular structure, which not only facilitates welding with the plurality of blades 102 through the annular structure, but also the copper alloy has a high structural strength, which can greatly improve the structural strength of the impeller.

[0051] Optionally, the integrated structural component 100 is a copper alloy casting structural component.

[0052] The integrated structural member 100 is configured as a copper alloy casting structural member, so that the integrated structural member 100 can be integrally formed by casting, thereby simplifying the processing steps and ensuring that the integrated structural member 100 has greater structural strength.

[0053] Optionally, the hub body 101 is a hollow cylindrical structural member, and the length of the hub body 101 in the axial direction is greater than the length of the outer ring frame 200 in the axial direction.

[0054] In this way, both ends of the hub body 101 can protrude outside the outer ring frame 200 so that the hub body 101 can be connected to other components, thereby facilitating the installation of the impeller.

[0055] On the other hand, the present disclosure also provides a method for manufacturing an impeller, which can be used to manufacture Figure 1 Impeller shown.

[0056] Figure 3 is a flow chart of a method for manufacturing an impeller of a propeller provided in an embodiment of the present disclosure, combined with Figure 3 The preparation method includes:

[0057] S301: Provide an integrated structural component.

[0058] The structure of the integrated structural member 100 is the same as that described above and will not be described in detail here.

[0059] S302: Sleeve the outer ring frame outside the plurality of blades, and make the outer ring frame coaxial with the hub body.

[0060] The structure of the outer ring frame 200 is the same as that described above and will not be repeated here.

[0061] S303: Welding the inner wall of the outer ring frame to the other ends of the plurality of blades to obtain an impeller.

[0062] Since the multiple blades 102 and the hub body 101 in the above impeller are processed as an integrated structural part, the integrated structural part 100 can be used to improve the connection strength between the blades 102 and the hub body 101, while avoiding the need to process the outer ring frame 200 as an integral part, thereby reducing the difficulty of processing. At the same time, it can also avoid the influence of the sudden change of the cross section at the connection part between the outer ring frame 200 and the multiple blades 102 during the integral casting process on the casting quality, thereby improving the quality of the impeller.

[0063] In addition, processing the outer ring frame 200 separately can also effectively improve the internal quality of the outer ring frame 200. Moreover, the integral structural member 100 is connected to the outer ring frame 200 by welding, which fully retains the advantages of each and avoids the quality risk caused by integral casting.

[0064] Figure 4 is a flow chart of another method for manufacturing an impeller of a propeller provided by an embodiment of the present disclosure, such as Figure 4 The present disclosure also provides another method for manufacturing an impeller, which can be used to manufacture Figure 1 The impeller shown. The manufacturing method includes:

[0065] S401: integrally forming a blank of an integral structural part.

[0066] The shape of the blank has a processing allowance of no less than 3mm.

[0067] The above-mentioned machining allowance of not less than 3mm is reserved for the shape of the blank, which means that according to the three-dimensional model of the impeller, when the blank is cast, the outer surface of the one-piece structural part is expanded outward by not less than 3mm according to the size of the theoretical three-dimensional model, so that the actual molding size of the one-piece structural part is not less than 3mm larger than the theoretical size.

[0068] The size of the blank is larger than the corresponding size of the integrated structural part in the three-dimensional model, and the difference between the size of the blank and the corresponding size in the three-dimensional model is not less than 3 mm.

[0069] In the disclosed embodiment, a blank of an integrated structural component can be directly cast in one piece by casting.

[0070] That is, a blank of an integrated structural component including a plurality of blades and a hub body is directly processed by casting, which can not only improve the overall structural strength of the integrated structural component, but also reduce the processing steps of the plurality of blades and the hub body.

[0071] The shape of the blank has a machining allowance of no less than 3 mm, so that a machining allowance can be reserved in advance for the subsequent finishing of the impeller.

[0072] The machining allowance left on the outer surface of the blank is not less than 3 mm, which is sufficient to ensure that the blades and the hub body can offset the influence of their deformation during the subsequent processing.

[0073] Figure 5 A schematic diagram of the structure of a blank of an integrated structural member provided in an embodiment of the present disclosure, combined with Figure 5 A slag discharge area 1021 is provided at the radially outward end of the blank.

[0074] During the casting process, impurities generated during the casting process will accumulate in the area along the edge of the blade, and when the casting cools, the impurities accumulated in the edge of the blade will solidify and remain in the area of ​​the edge of the blade. In this way, the solidified impurities will inevitably affect the quality of the blade, causing quality defects inside the edge of the outermost end of the blade, thereby affecting the quality of the blade. To this end, by providing a slag discharge area 1021 at one end of the blank radially outward, the impurities generated during the casting process can be gathered through the slag discharge area 1021, so as to improve the quality of the edge of the blade, and ultimately improve the quality of each blade in the integrally formed part, so that each blade meets the processing requirements.

[0075] Optionally, along the radial direction of the blade 102, the length of the slag discharge area 1021 (that is, Figure 5 The d) in the figure shall not be less than 15mm.

[0076] In this embodiment, along the radial direction of the blade, the length of the slag discharge zone (that is, Figure 5 d) in the figure is 20 mm.

[0077] Along the radial direction of the blade, the length of the slag discharge area 1021 (i.e. Figure 5 The d) in the figure is not less than 15 mm, so that the outermost edge of the blade can also meet the processing requirements and impurities will not be concentrated due to the casting process, thereby improving the quality of the blade.

[0078] That is, during the casting process, the blade 102 needs to be extended outward by 20 mm in the radial direction to serve as the slag discharge area 1021 .

[0079] S402: Processing the outer surface of the blank and removing the slag removal area of ​​the blank to obtain an integrated structural part.

[0080] Since the slag removal area is designed to remove impurities during molding, the slag removal area can be directly removed by machining after molding.

[0081] By machining the outer surface of the blank and removing the slag removal area of ​​the blank, the actual size of the blank can meet the theoretical requirements in the three-dimensional model.

[0082] Figure 6 A schematic diagram of the structure of an integrated structural member provided in an embodiment of the present disclosure, Figure 7 for Figure 6 Axial cross-section diagram, combined with Figure 6 and Figure 7 Through machining, the slag removal area of ​​the blank is first milled off, and then the outer surface of the blank is semi-finished to obtain an integrated structural part.

[0083] S403: Curling the metal sheet into a circular ring structure, and welding the butt joints of the metal sheet together.

[0084] Figure 8 A schematic diagram of the processing of the outer ring frame provided in the embodiment of the present disclosure, combined with Figure 8 In the disclosed embodiment, the copper alloy steel plate is rolled into a circular ring structure according to the outer dimensions of the outer ring frame, and the butt joint 201 is welded by a welding process to form a complete circular ring structure.

[0085] S404: machining the inner hole of the annular structure so that the inner hole matches the integral structural part.

[0086] After the outer ring is framed into a ring, the inner hole of the circular ring structure is machined so that the size of the inner hole of the circular ring structure forms a matching size with the size corresponding to the tip of the blade.

[0087] The so-called matching dimension refers to a hole-axis relationship set in mechanical design to meet specific functional requirements.

[0088] There are three common fit sizes: clearance fit, interference fit, and transition fit. Clearance fit means there is always a gap between the hole and the shaft, requiring the hole to be larger than the shaft, and the minimum gap must be greater than or equal to 0.

[0089] Interference fit: There is a certain interference between the hole and the shaft, and a certain external force is required to achieve relative movement.

[0090] Transition fit: There may be interference or clearance between the hole and the shaft, but the amount is not large.

[0091] In this embodiment, the outer ring frame and the blades are designed with corresponding matching dimensions according to the clearance fit.

[0092] Combination Figure 8 Through machining, the inner hole of the ring structure is ground so that the size and roughness of the inner hole meet the processing requirements.

[0093] S405: Sleeve the outer ring frame outside the plurality of blades, and make the outer ring frame coaxial with the hub body.

[0094] Fig. 9 The schematic diagram of the assembly of the outer ring frame and the integrated structural member provided in the embodiment of the present disclosure is combined with Fig. 9 The tip of each blade 102 is in contact with the wall of the inner hole of the outer ring frame 200 .

[0095] S406: Adjusting the axial position of the outer ring frame relative to the blades so that each of the plurality of blades is at the same distance from both ends of the outer ring frame.

[0096] By adjusting the axial position of the outer ring frame relative to the blades, each blade can be at the same distance from both ends of the outer ring frame in the axial direction of the outer ring frame, ensuring that each blade can be located at the center of the outer ring frame.

[0097] S407: Welding the inner wall of the outer ring frame and the plurality of blades together to obtain an impeller.

[0098] Optionally, step S407 may be implemented in the following manner:

[0099] 4071: Through the laser welding process, the middle part of the blade tip is welded to the inner wall of the outer ring frame.

[0100] First, the laser welding process is used to weld and fix the middle part of the blade tip to the inner hole of the outer ring frame. This can ensure the accuracy of positioning the blade and the inner hole of the outer ring frame and reduce the influence of conventional welding deformation on its position accuracy.

[0101] 4072: Use argon arc welding to weld the tip of the blade to the inner wall of the outer ring frame.

[0102] Then, argon arc welding is used to completely fix the tip of the blade to the inner hole of the outer ring frame, so that the entire impeller forms a whole.

[0103] The laser combined with argon arc welding process can not only ensure the accuracy of the position of the blade and the outer ring frame, but also ensure that the blade tip and the outer ring frame are completely melted through, thereby ensuring the structural strength requirements of the entire part.

[0104] At the same time, this combined process method avoids defects inside the weld and can effectively ensure the final internal quality of the impeller.

[0105] The welding material is stainless steel with a diameter not greater than 3 mm. In this embodiment, the welding material is GFS-316L stainless steel with a diameter of Φ2 mm.

[0106] S408: Perform stress relief annealing on the impeller.

[0107] The impeller obtained by welding will have accumulated stress inside. Through this process, most of the thermal stress of the impeller during welding can be basically eliminated, which can provide basic guarantee for the stability of subsequent machining dimensions.

[0108] The so-called stress relief annealing process is to load the parts into a heat treatment furnace, then slowly heat the heat treatment furnace to a specified temperature and keep it warm for a period of time, and then slowly cool it down, so as to achieve the purpose of improving the overall residual stress level of the parts.

[0109] In this embodiment, S408 can be implemented in the following manner:

[0110] (1) Place the impeller in a heat treatment furnace.

[0111] (2) Heat the heat treatment furnace to 500-600℃ within 1.5 hours and keep it at this temperature for at least 2 hours.

[0112] (3) Take the impeller out of the heat treatment furnace and place it in the air to cool naturally.

[0113] Through this process, most of the thermal stress of the impeller during the welding process is basically eliminated, providing basic guarantee for the stability of the subsequent machining dimensions.

[0114] S409: Perform flaw detection on the weld of the impeller after stress relief annealing.

[0115] After the welds between the blade and the outer ring frame are completed, they are transferred to the machining workshop, where the root welds are milled to reveal the copper alloy welds and metallic luster, and 100% PT (Penetrant Testing) is arranged.

[0116] This ensures that all welds are operable and accessible while also ensuring weld quality.

[0117] S410: Finishing the outer surface of the impeller.

[0118] The outer surface of the impeller includes the outer surface of the blades, the inner wall of the outer ring frame and the outer surface of the outer ring frame.

[0119] By fine-machining the outer surface of the blade, the inner wall of the outer ring frame and the outer surface of the outer ring frame, the impeller can be finally shaped to meet the manufacturing accuracy requirements.

[0120] Moreover, during the fine machining, the positioning joints of the impeller and other components are finely machined according to the drawing requirements so that the blades can be assembled in the propeller.

[0121] The above-mentioned manufacturing method avoids many disadvantages of integral casting and simplifies the manufacturing process of parts by assembling the impeller. This molding method not only gives full play to the advantages of the casting process, but also avoids the defect risks of integral casting and the cost cycle risks of forging molding. It controls risks and costs while effectively ensuring the quality characteristics of the impeller.

[0122] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A method for manufacturing an impeller of a propeller, characterized in that: The production method comprises: Providing an integrated structural member, the integrated structural member comprising a hub body and a plurality of blades, the plurality of blades being evenly spaced and arranged along the outer circumference of the hub body, and one end of the plurality of blades being connected to the outer circumference of the hub body; Sleeve the outer ring frame outside the plurality of blades, and make the outer ring frame coaxial with the hub body; The inner wall of the outer ring frame is welded to the other ends of the plurality of blades respectively to obtain the impeller.

2. The method according to claim 1, characterized in that: The provision of an integrated structural member comprises: Integrally forming a blank of the integrated structural component, wherein the outer shape of the blank has a machining allowance of not less than 3 mm, and a slag discharge area is provided at one end of the blank facing radially outward; The outer surface of the blank is processed, and the slag removal area of ​​the blank is removed to obtain the integrated structural part.

3. The method according to claim 2, characterized in that: Along the radial direction of the blade, the length of the slag discharge zone is not less than 15 mm.

4. The method according to claim 1, characterized in that: The method further comprises: Rolling the metal sheet into a ring structure and welding the butt joints of the metal sheet together; The inner hole of the annular structure is machined so that the inner hole matches the integral structural member.

5. The method according to claim 1, characterized in that: After the outer ring frame is sleeved outside the plurality of blades, the manufacturing method further comprises: The axial position of the outer ring frame relative to the blades is adjusted so that each of the plurality of blades is at the same distance from both ends of the outer ring frame.

6. The method according to claim 1, characterized in that: The step of welding the inner wall of the outer ring frame and the plurality of blades together to obtain the impeller comprises: By laser welding, the middle part of the tip of each blade is welded to the inner wall of the outer ring frame; The blade tips of the blades are all welded to the inner wall of the outer ring frame by argon arc welding.

7. The manufacturing method according to claim 1, characterized in that: After welding the inner wall of the outer ring frame and the plurality of blades together, the manufacturing method further comprises: The outer surface of the blade, the inner wall and the outer surface of the outer ring frame are respectively finished.

8. An impeller, the impeller being obtained by the manufacturing method according to any one of claims 1 to 7, characterized in that: The impeller comprises an integral structural member (100) and an outer ring frame (200). The integrated structural member (100) comprises a plurality of blades (102) and a hub body (101), wherein the plurality of blades (102) are connected to the outside of the hub body (101) at uniform intervals along the outer circumference of the hub body (101), The outer ring frame (200) is located outside the plurality of blades (102) and is coaxially arranged with the hub body (101); inner walls of the outer ring frame (200) are respectively welded to the plurality of blades (102).

9. The impeller according to claim 8, characterized in that The integrated structural component (100) is a copper alloy casting structural component.

10. The impeller according to claim 8, characterized in that The outer ring frame (200) is an annular copper alloy structural part.

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