Method for manufacturing a turbine pump fitting and turbine pump fitting thereof

Abstract

The application relates to a manufacturing method of a turbine pump accessory and the turbine pump accessory, the accessory comprising a turbine end bearing seat, a pump end bearing seat, a positioning shaft, a pump inlet shell and a pump outlet shell; the manufacturing method of the turbine pump accessory comprises the following steps: machining the turbine end bearing seat so that the turbine end bearing seat has first preset parameters; the turbine end bearing seat has a first shaft hole; machining the pump end bearing seat so that the pump end bearing seat has second preset parameters; the pump end bearing seat has a second shaft hole; one of the size precision, the shape and position tolerance and the surface roughness is included in the first preset parameters and the second preset parameters; the turbine end bearing seat is assembled to the pump outlet shell, and the coaxiality and the straightness of the first shaft hole of the turbine end bearing seat are aligned; the positioning shaft is assembled to the turbine end bearing seat; the pump inlet shell is sleeved on the positioning shaft and assembled to the pump outlet shell; and the pump end bearing seat is sleeved on the positioning shaft through the second shaft hole and assembled to the pump inlet shell.

Description

Technical Field

[0001] This application relates to the field of machining technology, and in particular to a method for manufacturing components of a turbopump and the components thereof. Background Technology

[0002] In the aerospace field, rocket engines, as the core power source for spacecraft launches, directly determine the success or failure of space missions. Turbopumps, as a critical subsystem of rocket engines, bear the heavy responsibility of transporting propellant; their manufacturing and assembly quality directly affects the stability, reliability, and service life of the turbopump rotor system.

[0003] In the machining of turbopump parts for low-temperature, high-speed engines, especially the turbopump housing and the two bearing seats, traditional machining methods and existing equipment have many limitations, resulting in high machining costs, long cycles, and heavy reliance on the operator's skill level. For example, traditional machining of turbopump parts requires multiple assembly steps. After assembling all parts, the inner holes of the two bearing seats are machined with a margin. To achieve the accuracy required by the part drawing, equipment with high machining accuracy and repeatability must be selected, and the machining of the inner holes of the two bearing seats must be completed in a single clamping operation. However, traditional machining methods struggle to precisely control the assembly accuracy of each step and the positioning accuracy during machining, making it difficult to consistently guarantee that the final machining accuracy of the parts meets the usage requirements.

[0004] In related technologies, precision CNC lathes are used for machining. However, this equipment cannot machine all dimensions of a part in a single setup, requiring a reversal process. This reversal introduces deviations during the second setup and alignment, which negatively impacts the machining accuracy of the part.

[0005] Alternatively, a precision machining center can be used. Although it can machine all surfaces of a part in one setup, the machining accuracy of the equipment itself cannot meet the requirements of the part machining, and cannot guarantee the dimensional and positional accuracy of the key parts of the part.

[0006] Alternatively, coordinate boring machines can be used. Currently, coordinate boring machines are the primary method for ensuring the machining accuracy of parts. Coordinate boring machines are mainly used for boring precision holes. For this part, due to the high requirements for the dimensional accuracy, geometric accuracy, and positional accuracy of the holes, as well as the fine surface roughness requirements, the machining allowance and depth of cut are small, and the number of feeds is high. Precise measurements are required after each machining operation, which heavily relies on the technical skills of dedicated inspection personnel and operators. Furthermore, the entire machining process is cumbersome, resulting in a long machining cycle.

[0007] Regardless of the method used, the cost of tooling and fixtures is high. The turbine pump housing has an irregular shape, requiring the design of specialized tooling and fixtures to meet installation and machining requirements. These fixtures are typically made by welding several flat plates together and then assembling them, resulting in high manufacturing costs and increasing the overall cost of parts processing. Summary of the Invention

[0008] Based on this, a method for manufacturing components of a turbopump and the components of the turbopump are provided, which can significantly shorten the processing cycle, reduce tooling costs, and significantly improve the efficiency of mass production while ensuring high-precision machining of parts.

[0009] A method for manufacturing a component of a turbopump, the component including a vortex end bearing housing, a pump end bearing housing, a positioning shaft, a pump inlet housing, and a pump outlet housing; wherein, the method for manufacturing the turbopump component includes:

[0010] The vortex bearing housing is machined to give it a first preset parameter; wherein the vortex bearing housing has a first shaft hole;

[0011] The pump end bearing housing is machined to give it a second preset parameter; wherein the pump end bearing housing has a second shaft hole; both the first preset parameter and the second preset parameter include one of dimensional accuracy, geometric tolerance, and surface roughness.

[0012] Assemble the vortex bearing housing to the pump outlet housing, and align the coaxiality and straightness of the first shaft hole of the vortex bearing housing so that the tolerances are controlled within 0.005mm.

[0013] Assemble the positioning shaft into the vortex end bearing housing;

[0014] The pump inlet housing is sleeved on the positioning shaft and assembled to the pump outlet housing;

[0015] The pump end bearing housing is sleeved on the positioning shaft through the second shaft hole, and the pump end bearing housing is assembled to the pump inlet housing.

[0016] In one embodiment, assembling the vortex bearing housing to the pump outlet housing includes:

[0017] The vortex end bearing housing and the pump outlet housing have a first connecting surface and a second connecting surface. The first connecting surface is parallel to the axial direction of the first shaft hole, and the second connecting surface is perpendicular to the axial direction of the first shaft hole.

[0018] Align the circular runout and straightness of the first connecting surface of the pump outlet housing to control its tolerance within 0.01mm, and then assemble the vortex end bearing seat to the pump outlet housing.

[0019] In one embodiment, assembling the vortex bearing housing to the pump outlet housing includes:

[0020] The vortex bearing housing and the pump outlet housing are machined to form a first positioning pin hole, which passes through the vortex bearing housing, the second connecting surface, and extends to the pump outlet housing.

[0021] The first locating pin is inserted into the first locating pin hole to fix the vortex bearing housing and the pump outlet housing.

[0022] In one embodiment, assembling the vortex bearing housing to the pump outlet housing includes:

[0023] Pre-tightening treatment is performed between the vortex end bearing housing assembly and the pump outlet housing.

[0024] In one embodiment, assembling the positioning shaft to the vortex end bearing housing includes:

[0025] The positioning shaft is immersed in liquid nitrogen for a first preset time.

[0026] Remove the positioning shaft and assemble it into the vortex end bearing housing.

[0027] In one embodiment, the pump end bearing housing is sleeved onto the positioning shaft through the second shaft hole, and the pump end bearing housing is assembled to the pump inlet housing, including:

[0028] The pump end bearing housing is sleeved onto the positioning shaft through the second shaft hole, and the end face of the pump end bearing housing is initially fitted with the pump inlet housing;

[0029] Tap the pump end bearing housing and the pump outlet housing to adjust the axial and radial clearances between the pump end bearing housing and the pump inlet housing, so that the pump end bearing housing is assembled into the positioning shaft and the pump inlet housing.

[0030] In one embodiment, pre-tightening treatment is performed between the pump outlet housing and the pump inlet housing, and between the pump end bearing housing and the pump inlet housing.

[0031] In one embodiment, a first mounting surface is provided between the pump outlet housing and the pump inlet housing, and a second mounting surface is provided between the pump end bearing housing and the pump inlet housing;

[0032] Both the first mounting surface and the second mounting surface are parallel to the positioning shaft, and there is a clearance fit between the pump outlet housing and the pump inlet housing located on the first mounting surface, and a clearance fit between the pump end bearing seat and the pump inlet housing located on the second mounting surface.

[0033] In one embodiment, the pump end bearing housing is assembled into the positioning shaft and the pump inlet housing, including:

[0034] The pump outlet housing and the pump inlet housing are machined to form a second locating pin hole;

[0035] The second positioning pin is inserted into the second positioning pin hole to fix the pump outlet housing and the pump inlet housing;

[0036] The pump inlet housing and the pump end bearing seat are machined to form a third locating pin hole;

[0037] The third locating pin is inserted into the third locating pin hole to fix the pump inlet housing and the pump end bearing seat.

[0038] In one embodiment, the coefficient of linear expansion of the liquid nitrogen in the vortex end bearing housing is: The coefficient of linear expansion of the positioning shaft in liquid nitrogen is This makes the shrinkage dimension of the positioning shaft greater than the shrinkage dimension of the vortex end bearing seat;

[0039] The positioning shaft is configured to inject liquid nitrogen between the first shaft hole and the positioning shaft during disassembly.

[0040] In one embodiment, it includes:

[0041] The machining accuracy of at least one of the vortex end bearing housing, the pump end bearing housing, the positioning shaft, the pump inlet housing, and the pump outlet housing is monitored in real time.

[0042] A turbopump component is manufactured by the turbopump component manufacturing method described above;

[0043] The components of the turbopump include a vortex end bearing housing, a pump end bearing housing, a positioning shaft, a pump inlet housing, and a pump outlet housing.

[0044] The vortex bearing housing is disposed inside the pump outlet housing, and the vortex bearing housing has a first shaft hole, with one end of the positioning shaft passing through the first shaft hole;

[0045] The pump inlet housing is sleeved on the positioning shaft and connected to the pump outlet housing;

[0046] The pump end bearing housing has a second shaft hole, and the pump end bearing housing is sleeved on the positioning shaft through the second shaft hole and connected to the pump inlet housing.

[0047] The manufacturing method of the aforementioned turbopump components and the turbopump components disclosed herein, by first machining the turbine end bearing housing and the pump end bearing housing separately and then assembling them together, improves machining accuracy and production efficiency, and reduces equipment investment and production risks. Specialized, high-precision general-purpose machining equipment is used to machine the two bearing housings separately, ensuring that the dimensional accuracy, geometric tolerances, and surface roughness of each bearing housing meet design standards. By optimizing the assembly steps and using specialized tooling, the reliance on the skill level of operators is reduced. While ensuring machining accuracy, the machining cycle is significantly shortened, production costs are reduced, and economic benefits are improved. Attached Figure Description

[0048] Figure 1 This is a schematic flowchart illustrating a method for manufacturing components of a turbopump in an exemplary embodiment.

[0049] Figure 2 This is a cross-sectional schematic diagram of an accessory for a turbopump in an exemplary embodiment.

[0050] Figure 3 This is a schematic cross-sectional view of the vortex end bearing housing in an exemplary embodiment.

[0051] Figure 4 This is a schematic cross-sectional view of the pump end bearing housing in an exemplary embodiment.

[0052] Figure label:

[0053] 1. Vortex end bearing housing; 11. First shaft hole; 12. First through hole; 2. Pump end bearing housing; 21. Second shaft hole; 22. Third through hole; 3. Positioning shaft; 4. Pump inlet housing; 41. Third blind hole; 42. Second through hole; 5. Pump outlet housing; 51. First through hole; 52. First blind hole; 53. Second blind hole; 6. First positioning pin; 7. Second positioning pin; 8. Third positioning pin; A. First connecting surface; B. Second connecting surface; C. First mounting surface; D. Second mounting surface. Detailed Implementation

[0054] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0055] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0056] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0057] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0058] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0059] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0060] In some exemplary embodiments, such as Figure 1 As shown, a method for manufacturing a turbopump component is provided, for manufacturing turbopump components, with reference to... Figures 2-4 As shown, the components include a turbine end bearing housing 1, a pump end bearing housing 2, a positioning shaft 3, a pump inlet housing 4, and a pump outlet housing 5. The manufacturing method of the turbine pump components includes the following steps:

[0061] S100, Machining the vortex end bearing housing.

[0062] In step S100, refer to Figures 2-4 As shown, the vortex end bearing housing 1 is subjected to rough machining, semi-finishing machining and finishing machining in sequence. Through multi-stage machining, the overall shape and internal structure of the vortex end bearing housing 1 are gradually shaped so that it has a form that meets the requirements of subsequent assembly.

[0063] After these processing steps, the volute bearing housing 1 has a first preset parameter. Specifically, the volute bearing housing 1 has a first shaft hole 11, the diameter of which is, for example, [missing information]. .

[0064] During the finishing stage, high-precision grinding and other processes can be used to strictly control the first preset parameters of the volute bearing housing 1. These first preset parameters include, for example, dimensional accuracy, geometric tolerances, and surface roughness. Dimensional accuracy includes, for example, inner diameter, outer diameter, and thickness. Precise control of these parameters ensures the tightness and stability of the volute bearing housing 1 when connected to other components. Geometric tolerances include, for example, coaxiality, parallelism, and cylindricity. Coaxiality ensures the consistency of the axis between the first shaft hole 11 and the axis of subsequent assembled components, while parallelism and cylindricity ensure the regularity of the overall structure of the volute bearing housing 1, facilitating accurate docking with other components.

[0065] For example, a surface roughness Ra of 0.4 can reduce friction between components, improve the smoothness of connection, and extend service life. By strictly controlling these parameters, it is ensured that all parameters of the vortex bearing housing 1 meet the design standards, laying the foundation for reliable connection with other components in the future.

[0066] S110. Machining of the pump end bearing housing.

[0067] In step S110, refer to Figures 2-4 As shown, the pump end bearing housing 2 is also subjected to rough machining, semi-finishing, and finishing processes to form a structure suitable for connection with other components, and has a second preset parameter. Specifically, the pump end bearing housing 2 has a second shaft hole 21 for connection with the positioning shaft 3, etc., and the diameter of the second shaft hole 21 is, for example, [missing information]. .

[0068] During the finishing stage, high-precision grinding and other processes are used to strictly control the second preset parameters of the pump end bearing housing 2. Similar to the volute bearing housing 1, the second preset parameters include one of dimensional accuracy, geometric tolerances, or surface roughness. Dimensional accuracy includes, for example, inner diameter, outer diameter, and thickness; geometric tolerances include, for example, coaxiality, parallelism, and cylindricity. This ensures that all parameters of the volute bearing housing 1 meet design standards, guaranteeing the accuracy of the pump end bearing housing 2 structure and the reliability of its connection with other components.

[0069] Precise dimensional accuracy ensures a tight fit between the pump end bearing housing 2 and the positioning shaft 3, while reasonable geometric tolerances guarantee the axial consistency and structural regularity between components. Good surface roughness reduces friction, improves the stability and service life of the connection, and ensures that all parameters of the pump end bearing housing 2 meet the design standards and subsequent assembly requirements.

[0070] S120. Assemble the volute bearing housing to the pump outlet housing and align the coaxiality and straightness of the first shaft hole of the volute bearing housing.

[0071] In step S120, refer to Figures 2-4 As shown, the pump outlet housing 5 has a first through hole 51. The volute bearing housing 1 is installed into the first through hole 51, establishing a preliminary connection between the volute bearing housing 1 and the pump outlet housing 5. The diameter of the first shaft hole 11 of the volute bearing housing 1 is then aligned. The coaxiality and straightness of the turbine pump rotor are precisely aligned, with straightness referring to the perpendicularity of the turbine bearing housing 1. For example, using the axial end face of the turbine bearing housing 1 as a reference and the axis of the first shaft hole 11 as the reference axis, the maximum deviation between the actual surface of the axial end face and the ideal perpendicular plane of the reference axis is controlled to not exceed 0.01 mm, and all tolerances are controlled within 0.005 mm. This ensures the perpendicular relationship between the axis of the first shaft hole 11 in the turbine bearing housing 1 and the reference axis after the turbine pump rotor is assembled. If the turbine bearing housing 1 is tilted, it will cause rotor eccentricity or vibration, affecting the normal operation and performance stability of the turbine pump. By accurately aligning the coaxiality and straightness, the rotor can be ensured to be in the correct position after assembly, reducing vibration and wear during operation and improving the working efficiency and reliability of the turbine pump.

[0072] In step S120, "assembling the vortex end bearing housing to the pump outlet housing" also includes: aligning the circular runout and straightness of the first connecting surface A of the pump outlet housing 5.

[0073] For example, the volute bearing housing 1 and the pump outlet housing 5 have a first connecting surface A and a second connecting surface B. The first connecting surface A is parallel to the axial direction of the first shaft hole 11, and the second connecting surface B is perpendicular to the axial direction of the first shaft hole 11. The circular runout and straightness of the first connecting surface A of the pump outlet housing 5 are aligned to control its tolerance within 0.01 mm, and then the volute bearing housing 1 is assembled to the pump outlet housing 5.

[0074] Precise control of the circular runout and straightness of the first connecting surface A lays the most fundamental foundation for the subsequent assembly of the pump end bearing housing 2. If the circular runout and straightness exceed the tolerance range, deviations will occur during the assembly of the pump end bearing housing 2, affecting the overall performance of the component. By strictly controlling the tolerances, the coaxiality requirements of the two bearing housings can be guaranteed, improving the reliability and stability of the component's operation.

[0075] At this point, pre-tightening is performed between the vortex end bearing housing 1 and the pump outlet housing 5. Screws are used to pre-tighten according to the torque requirements. This pre-tightening process creates pressure on the two components at the initial connection stage, enhancing the tightness of the connection. During subsequent use, it effectively prevents the components from loosening due to vibration, stress, or other factors, ensuring the reliability of the connection.

[0076] After pre-tightening, the volute bearing housing 1 and the pump outlet housing 5 are machined to form the first locating pin hole. The first locating pin hole penetrates the volute bearing housing 1, the second connecting surface B, and extends to the pump outlet housing 5. For example, the volute bearing housing 1 is provided with a first through hole 12, and the pump outlet housing 5 is provided with a first blind hole 52. The first through hole 12 and the first blind hole 52 are correspondingly arranged, and the two together constitute the first locating pin hole. One end of the first locating pin 6 is passed through the first through hole 12 and inserted into the first blind hole 52, so that the first locating pin 6 passes through the first locating pin hole, thereby fixing the volute bearing housing 1 and the pump outlet housing 5.

[0077] The locating pins precisely limit the relative positions of the two components, preventing displacement during operation. The precise insertion of the locating pins ensures a stable structural connection between the volute bearing housing 1 and the pump outlet housing 5, improving the reliability and precision of the entire assembly.

[0078] S130. Assemble the positioning shaft into the vortex end bearing housing.

[0079] In step S130, refer to Figures 2-4As shown, one end of the positioning shaft 3 is inserted into the first shaft hole 11 of the scroll bearing housing 1. To reduce the error in the assembly clearance between the positioning shaft 3 and the scroll bearing housing 1 and improve the assembly accuracy of the positioning shaft 3, the installation clearance between the positioning shaft 3 and the scroll bearing housing 1 is designed to be a very small clearance or transition fit. This prevents the positioning shaft 3 from being fully assembled into the scroll bearing housing 1. Therefore, the positioning shaft 3 needs to be machined so that it can be smoothly installed into the first shaft hole 11 of the scroll bearing housing 1.

[0080] For example, the positioning shaft 3 is immersed in low-temperature liquid nitrogen for a first preset time. The first preset time is, for example, 8-12 minutes, or more specifically, 10 minutes.

[0081] Remove the positioning shaft 3 and assemble it into the first shaft hole 11 of the volute bearing housing 1. Immersion in liquid nitrogen causes the material of the positioning shaft 3 to shrink, reducing its size and making it easier to install into the first shaft hole 11.

[0082] Among them, the positioning shaft 3 is made of bar stock. The entire assembly is machined to give it good mechanical and machinability properties, thereby improving the performance of the positioning shaft 3. Furthermore, to ensure the overall dimensional stability of the positioning shaft 3, a step-by-step processing method can be used.

[0083] For example, the raw material for the positioning shaft 3 is provided, immersed in liquid nitrogen for a certain period of time, removed and roughly machined to form a preliminary shape. It is then immersed in liquid nitrogen again for a certain period of time, removed and semi-finished to further form a prototype. Then it is immersed in liquid nitrogen for a certain period of time, removed and hard chrome plated, and finally finished to form the final positioning shaft 3.

[0084] Multiple immersions in liquid nitrogen thoroughly remove residual stress from the manufacturing process. If this residual stress is not eliminated, it can cause deformation of the positioning shaft 3 during use, affecting its dimensional stability. Multiple immersions fully release the internal stress of the positioning shaft 3 material, ensuring its dimensional stability during long-term use. Simultaneously, the hard chrome plating process on the surface of the positioning shaft 3 improves its wear resistance and service life. The hard chrome layer has good hardness, reducing wear when the positioning shaft 3 comes into contact with other components, thus extending its service life. The immersion time in liquid nitrogen is determined based on actual needs; the duration of each immersion can be the same or different. This treatment effectively reduces assembly clearance errors, improves assembly accuracy, and ensures the stability and reliability of the connection between the positioning shaft 3 and the volute bearing housing 1.

[0085] S140, The pump inlet housing is fitted onto the positioning shaft and assembled to the pump outlet housing.

[0086] In step S140, refer to Figures 2-4 As shown, the pump inlet housing 4 is connected to the pump outlet housing 5. At this point, a fine-tuning process will be performed when installing the pump end bearing seat 2. Therefore, pre-tightening or fixing between the pump inlet housing 4 and the pump outlet housing 5 is not required initially. This approach provides flexibility for subsequent installation; if installation is inconvenient, the positions of the two housings can be adjusted accordingly to ensure smooth installation of the pump end bearing seat 2, improving assembly efficiency and accuracy.

[0087] S150, the pump end bearing housing is sleeved on the positioning shaft through the second shaft hole, and the pump end bearing housing is assembled to the pump inlet housing.

[0088] In step S150, refer to Figures 2-4 As shown, the pump end bearing seat 2 is sleeved on the positioning shaft 3 through the second shaft hole 21, and the pump end bearing seat 2 is installed inside the pump inlet housing 4.

[0089] When installing the pump end bearing housing 2, the pump end bearing housing 2 is fitted onto the positioning shaft 3 through the second shaft hole 21, and the end face of the pump end bearing housing 2 is initially fitted with the pump inlet housing 4. The pump end bearing housing 2 and the pump outlet housing 5 are tapped to adjust the axial and radial clearances between the pump end bearing housing 2 and the pump inlet housing 4, ensuring that the pump end bearing housing 2 is smoothly assembled into the positioning shaft 3 and the pump inlet housing 4. Multiple tappings are used for positioning; these multiple taps allow for more precise adjustment of the clearances, ensuring the accurate installation position of the pump end bearing housing 2 between the positioning shaft 3 and the pump inlet housing 4, resulting in a tighter and more stable connection between the components.

[0090] A first mounting surface C is provided between the pump outlet housing 5 and the pump inlet housing 4, and a second mounting surface D is provided between the pump end bearing seat 2 and the pump inlet housing 4. Both the first mounting surface C and the second mounting surface D are parallel to the positioning shaft 3, and the pump outlet housing 5 and the pump inlet housing 4 located on the first mounting surface C are clearance-fitted, as are the pump end bearing seat 2 and the pump inlet housing 4 located on the second mounting surface D.

[0091] During assembly, the gap distance can be adjusted by gently tapping the pump outlet housing 5 and the pump end bearing seat 2 with a copper rod. The use of the copper rod can avoid damage to the components during the tapping process, and the gap can be precisely controlled by gentle tapping, ensuring that the pump end bearing seat 2 can be smoothly installed between the positioning shaft 3 and the pump inlet housing 4, thereby improving the accuracy and reliability of the assembly.

[0092] Pre-tightening is performed between the pump outlet housing 5 and the pump inlet housing 4, as well as between the pump end bearing seat 2 and the pump inlet housing 4. This pre-tightening is achieved using screws, followed by positioning and fixing. Pre-tightening creates pressure between the components, enhancing the tightness of the connection and preventing loosening due to vibration or other factors during use. Positioning and fixing further ensures the accuracy of the relative positions between the components, improving the reliability of the connection.

[0093] Controlling the assembly clearance and preload ensures the installation accuracy of the pump end bearing housing 2 within the pump inlet housing 4, achieving ideal coaxiality and parallelism between the two pump end bearing housings 2 and the volute end bearing housing 1. Ideal coaxiality and parallelism are crucial for the normal operation of the turbopump. If these requirements are not met, unbalanced forces will occur in the rotor during operation, causing vibration and wear, thus affecting the turbopump's performance and lifespan. Precise control of the assembly clearance and preload ensures accurate relative positioning between components, improving the overall performance of the turbopump.

[0094] After installation, further fixation is performed between the pump outlet housing 5 and the pump inlet housing 4, as well as between the pump end bearing seat 2 and the pump inlet housing 4, to improve the reliability of the connection.

[0095] For example, the pump outlet housing 5 and the pump inlet housing 4 are machined to form a second locating pin hole. Exemplarily, the pump outlet housing 5 is provided with a second blind hole 53, and the pump inlet housing 4 is provided with a second through hole 42. The second blind hole 53 and the second through hole 42 are correspondingly provided, and together they constitute the second locating pin hole. One end of the second locating pin 7 passes through the second blind hole 53 and is inserted into the second through hole 42, so that the second locating pin 7 passes through the second locating pin hole, thereby fixing the pump outlet housing 5 and the pump inlet housing 4.

[0096] Similarly, the pump inlet housing 4 and the pump end bearing seat 2 are machined to form a third locating pin hole. For example, the pump inlet housing 4 is provided with a third blind hole 41, and the pump end bearing seat 2 is provided with a third through hole 22. The third blind hole 41 and the third through hole 22 are correspondingly provided, and together they constitute the third locating pin hole. One end of the third locating pin 8 passes through the third blind hole 41 and is inserted into the third through hole 22, so that the third locating pin 8 is inserted into the third locating pin hole, thereby fixing the pump inlet housing 4 and the pump end bearing seat 2.

[0097] The locating pins precisely limit the relative positions of components, preventing them from shifting during operation and ensuring the stability and reliability of the entire turbine pump assembly structure.

[0098] In some exemplary embodiments, such as Figures 2-4As shown, this embodiment utilizes the different coefficients of linear expansion of the vortex end bearing housing 1 and the positioning shaft 3 in a liquid nitrogen environment, and makes reasonable use of the difference in their shrinkage dimensions to achieve the smooth disassembly of each part.

[0099] For example, the coefficient of linear expansion of liquid nitrogen in the vortex end bearing housing 1 is... The coefficient of linear expansion of liquid nitrogen on positioning axis 3 is This allows the shrinkage dimension of the positioning shaft 3 to be greater than that of the vortex end bearing seat 1 under the same liquid nitrogen environment, providing a basis for subsequent disassembly operations.

[0100] The positioning shaft 3 is configured to inject liquid nitrogen between the first shaft hole 11 and the positioning shaft 3 during disassembly.

[0101] For example, when it is necessary to disassemble the positioning shaft 3, prepare an appropriate amount of liquid nitrogen. Slowly and evenly inject the liquid nitrogen into the E-surface area between the first shaft hole 11 and the positioning shaft 3. The amount of liquid nitrogen injected needs to be strictly controlled. If the amount injected is too small, the positioning shaft 3 may not be able to contract sufficiently, making disassembly difficult; if the amount injected is too large, it will not only waste liquid nitrogen, but may also have unnecessary low-temperature effects on the surrounding environment and parts. After the liquid nitrogen is injected, because the coefficient of linear expansion of liquid nitrogen in the positioning shaft 3 is greater than that in the volute bearing seat 1, the positioning shaft 3 will contract rapidly, and the contraction size will be greater than that in the volute bearing seat 1. At this time, a gap will appear between the positioning shaft 3 and the first shaft hole 11, and the operator can easily remove the positioning shaft 3 from the first shaft hole 11.

[0102] In addition, when disassembling the pump end bearing housing 2 and the pump inlet housing 4, the connecting screws between them must first be removed. Using appropriate tools, such as screwdrivers and wrenches, unscrew the screws connecting the pump end bearing housing 2 and the pump inlet housing 4 one by one, and store them properly to prevent loss. After completing the above operations, use the set screw hole to push out the pump end bearing housing 2. Install the set screw into the set screw hole on the pump end bearing housing 2, and by rotating the set screw, use the pushing force of the set screw to slowly push the pump end bearing housing 2 out of the pump inlet housing 4. During the pushing process, be careful to control the force to avoid damaging the parts.

[0103] When disassembling the pump outlet housing 5 and the pump inlet housing 4, first loosen the screws connecting them. Using the same method as described above, unscrew the screws connecting the pump outlet housing 5 and the pump inlet housing 4. After completing these operations, since the pump inlet housing 4 is no longer connected to other parts, the operator can easily remove the pump inlet housing 4 from the overall structure.

[0104] Finally, disassemble the volute bearing housing 1 and the pump outlet housing 5. First, remove the screws connecting the volute bearing housing 1 and the pump outlet housing 5, using appropriate tools to remove the screws one by one. The connection between the volute bearing housing 1 and the pump outlet housing 5 is completely disconnected, and the operator can remove the volute bearing housing 1 from the pump outlet housing 5.

[0105] By following the steps above, in a specific order and method, and utilizing the difference in the linear expansion coefficients of the positioning shaft and the turbine end bearing housing under liquid nitrogen, the components of the cryogenic high-speed engine turbopump were successfully disassembled. The entire process is relatively simple and can effectively ensure that the components are not damaged during disassembly.

[0106] In some exemplary embodiments, such as Figures 2-4 As shown, the machining accuracy of each component is monitored in real time, and machining parameters are adjusted based on the monitoring results to ensure the stability of machining quality. For example, the manufacturing method of turbopump components includes real-time monitoring of the machining accuracy of at least one of the following: turbine end bearing housing 1, pump end bearing housing 2, positioning shaft 3, pump inlet housing 4, and pump outlet housing 5.

[0107] In practice, real-time monitoring of individual components, some components, or all components can be flexibly selected based on factors such as production needs, equipment conditions, and the importance of each component to the overall performance of the turbopump. For example, if the machining accuracy of the turbine end bearing housing 1 and the pump end bearing housing 2 has a significant impact on the operational stability and lifespan of the turbopump, then real-time monitoring of these two components is necessary.

[0108] Introducing online inspection technology during the manufacturing process enables real-time monitoring of machining accuracy. Specifically, appropriate online inspection equipment and sensors are selected for different parts and machining processes.

[0109] For example, consider the vortex-end bearing housing 1 and the pump-end bearing housing 2. Due to the high precision requirements, especially for parameters such as internal hole dimensions, surface roughness, and positional accuracy, high-precision laser measuring sensors can be used. These sensors can be mounted on machining equipment, such as the worktable or turret of a CNC machine tool, to collect dimensional data and positional information of key parts of the bearing housing in real time during machining. When boring the internal holes of the two bearing housings, the laser measuring sensor can move along the axis of the internal hole to measure the diameter of the internal hole in real time and transmit the measurement data to the data processing system.

[0110] For positioning axis 3, the main accuracy parameters are diameter, cylindricity, and surface roughness. Contact or non-contact online measuring devices can be used. Contact measuring devices, such as high-precision probes, can directly contact the surface of the positioning axis to accurately measure its dimensional and shape errors. Non-contact measuring devices, such as optical measuring instruments, acquire the surface contour information of the positioning axis by emitting light and receiving reflected signals, offering advantages such as high measurement speed and no damage to the object being measured.

[0111] For the pump inlet housing 4 and pump outlet housing 5, considering their complex external structure, which includes multiple holes, surfaces, and grooves, a high-precision online inspection system with multi-axis linkage can be used. This system consists of multiple measuring sensors that can simultaneously measure multiple parts of the housing, comprehensively acquiring information such as dimensional accuracy, shape accuracy, and positional accuracy. For example, when machining mounting holes on the housing, the online inspection system can monitor the hole's diameter, roundness, and relative positional relationship with other holes in real time, ensuring that the machining accuracy of each hole meets design requirements.

[0112] The raw data collected by online monitoring equipment needs to be analyzed and processed by a professional data processing system. This system typically consists of computer hardware and corresponding software, and includes functions such as data acquisition, storage, analysis, and display.

[0113] Online inspection equipment transmits real-time measured data to a data processing system via wired or wireless means. The system collects and stores the data according to preset sampling frequency and accuracy requirements. For example, for high-precision machining processes, the sampling frequency can be set to tens or even hundreds of times per second to ensure that minute changes during the machining process can be captured.

[0114] The data processing system performs real-time analysis on the collected data, employing statistical methods and error analysis algorithms to calculate the deviation between the actual and design values ​​of the processing parameters for each component. For example, by calculating the difference between the actual measured value and the design value of the inner diameter of the vortex bearing housing 1, the diameter deviation is obtained; simultaneously, the trend of deviation changes is analyzed to determine whether the processing process is stable.

[0115] To facilitate operators' real-time monitoring of machining accuracy, the data processing system displays the analysis results on the monitoring screen in intuitive graphical, chart, or numerical form. For example, by plotting real-time dimensional curves, operators can clearly see the changes in the inner diameter of the volute bearing housing 1 during machining; when deviations exceed the preset range, the system will issue an alarm signal to remind operators to take timely measures.

[0116] Once the online inspection system detects a deviation in machining accuracy, the data processing system will immediately issue instructions to the machining equipment according to a preset adjustment strategy to adjust the machining parameters, ensuring the stability of the machining quality of the vortex end bearing housing 1 and the pump end bearing housing 2. The specific adjustment strategy is as follows:

[0117] If a dimensional parameter (such as the inner diameter) of the volute bearing housing 1 or the pump end bearing housing 2 is detected to be too large, the data processing system will instruct the machining equipment to reduce the depth of cut or feed rate, thereby reducing the amount of material removed, so that the dimension gradually approaches the design value. Conversely, if the dimension is too small, the system will instruct to increase the depth of cut or feed rate, thereby increasing the amount of material removed. For example, when it is found that the inner diameter of the volute bearing housing 1 is 0.02 mm larger than the design value, the system will instruct the CNC machine tool to reduce the depth of cut by 0.01 mm and perform re-machining and measurement until the dimension meets the requirements.

[0118] For shape accuracy deviations, such as excessive cylindricity, the data processing system will adjust the motion trajectory of the machining equipment or the tool posture according to the direction and degree of the deviation. For example, if the cylindricity of the pump end bearing housing 2 is larger at the top and smaller at the bottom, the system will instruct the CNC machine tool to adjust the feed direction and cutting parameters of the tool to make the machined cylindrical surface more uniform.

[0119] When a deviation in the positional accuracy of a component is detected, such as a misalignment between the mounting hole position on the pump inlet housing 4 and its designed position, the data processing system will instruct the machining equipment to reposition or adjust the machining coordinate system. For example, by correcting the coordinate origin position of the CNC machine tool, subsequent machining operations can be performed in the correct position, ensuring that the positional accuracy of the mounting hole meets the requirements.

[0120] Through the above-described specific implementation methods of real-time monitoring, data processing, and machining parameter adjustment, this disclosure can effectively ensure the machining accuracy of each component of the turbopump, especially the machining quality stability of the vortex end bearing housing 1 and the pump end bearing housing 2, thereby improving the overall performance and reliability of the turbopump.

[0121] In some exemplary embodiments, such as Figures 2-4 As shown, a turbopump component is manufactured using the turbopump component manufacturing method described in any of the above embodiments. This manufacturing method ensures the processing quality of each component by real-time monitoring of the machining accuracy of each component and timely adjustment of machining parameters when deviations occur, thereby resulting in turbopump components manufactured by this method having excellent overall performance and stable quality.

[0122] The components of the turbo pump include a turbine end bearing housing 1, a pump end bearing housing 2, a positioning shaft 3, a pump inlet housing 4, and a pump outlet housing 5.

[0123] The vortex bearing housing 1 is located inside the pump inlet housing 4. The vortex bearing housing 1 has a first shaft hole, and one end of the positioning shaft 3 passes through the first shaft hole 11.

[0124] The pump inlet housing 4 is mounted on the positioning shaft 3 and connected to the pump outlet housing 5.

[0125] The pump end bearing housing 2 has a second shaft hole 21. The pump end bearing housing 2 is sleeved on the positioning shaft 3 through the second shaft hole 21 and connected to the pump inlet housing 4.

[0126] The specific setup and connection methods have been described in detail in the above embodiments and will not be repeated here.

[0127] The turbine pump components disclosed herein are manufactured by first precision machining the turbine end bearing housing 1 and the pump end bearing housing 2 separately, and then assembling them together. This improves machining accuracy and production efficiency while reducing equipment investment and production risks. Specialized, high-precision general-purpose machining equipment is used to individually precision machine the two bearing housings, ensuring that the dimensional accuracy, geometric tolerances, and surface roughness of each bearing housing meet design standards.

[0128] By employing high-precision positioning fixtures and measuring instruments, precise positioning and fit between the bearing housing and the casing are ensured during assembly. By controlling assembly clearances and preload, the installation accuracy of the bearing housing within the casing is guaranteed. High-precision machining is no longer dependent on specialized equipment; general-purpose machining equipment can achieve this. This reduces equipment investment, shortens processing cycles, lowers production risks, and significantly improves batch production efficiency. Optimizing assembly steps and using specialized fixtures reduces reliance on operator skill levels. While maintaining machining accuracy, the processing cycle is significantly shortened, production costs are reduced, and economic benefits are improved.

[0129] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0130] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method for manufacturing a component of a turbopump, characterized in that, The components include a turbine end bearing housing, a pump end bearing housing, a positioning shaft, a pump inlet housing, and a pump outlet housing; wherein, the manufacturing method of the turbine pump components includes: The vortex bearing housing is machined to give it a first preset parameter; wherein the vortex bearing housing has a first shaft hole; The pump end bearing housing is machined to give it a second preset parameter; wherein the pump end bearing housing has a second shaft hole; both the first preset parameter and the second preset parameter include one of dimensional accuracy, geometric tolerance, and surface roughness. Assemble the vortex bearing housing to the pump outlet housing, and align the coaxiality and straightness of the first shaft hole of the vortex bearing housing so that the tolerances are controlled within 0.005mm. Assemble the positioning shaft into the vortex end bearing housing; The pump inlet housing is sleeved on the positioning shaft and assembled to the pump outlet housing; The pump end bearing housing is sleeved on the positioning shaft through the second shaft hole, and the pump end bearing housing is assembled to the pump inlet housing.

2. The method for manufacturing the components of the turbopump according to claim 1, characterized in that, Assembling the vortex bearing housing to the pump outlet housing includes: The vortex end bearing housing and the pump outlet housing have a first connecting surface and a second connecting surface. The first connecting surface is parallel to the axial direction of the first shaft hole, and the second connecting surface is perpendicular to the axial direction of the first shaft hole. Align the circular runout and straightness of the first connecting surface of the pump outlet housing to control its tolerance within 0.01mm, and then assemble the vortex end bearing seat to the pump outlet housing.

3. The method for manufacturing the components of the turbopump according to claim 2, characterized in that, Assembling the vortex bearing housing to the pump outlet housing includes: The vortex bearing housing and the pump outlet housing are machined to form a first positioning pin hole, which passes through the vortex bearing housing, the second connecting surface, and extends to the pump outlet housing. The first locating pin is inserted into the first locating pin hole to fix the vortex bearing housing and the pump outlet housing.

4. The method for manufacturing the components of the turbopump according to claim 1, characterized in that, Assembling the vortex bearing housing to the pump outlet housing includes: Pre-tightening treatment is performed between the vortex end bearing housing assembly and the pump outlet housing.

5. The method for manufacturing the components of the turbopump according to claim 1, characterized in that, The process of assembling the positioning shaft to the volute bearing housing includes: The positioning shaft is immersed in liquid nitrogen for a first preset time. Remove the positioning shaft and assemble it into the vortex end bearing housing.

6. The method for manufacturing the components of the turbopump according to claim 1, characterized in that, The pump end bearing housing is sleeved onto the positioning shaft through the second shaft hole, and the pump end bearing housing is assembled to the pump inlet housing, including: The pump end bearing housing is sleeved onto the positioning shaft through the second shaft hole, and the end face of the pump end bearing housing is initially fitted with the pump inlet housing; Tap the pump end bearing housing and the pump outlet housing to adjust the axial and radial clearances between the pump end bearing housing and the pump inlet housing, so that the pump end bearing housing is assembled into the positioning shaft and the pump inlet housing.

7. The method for manufacturing the components of the turbopump according to claim 6, characterized in that, Pre-tightening treatment is performed between the pump outlet housing and the pump inlet housing, and between the pump end bearing housing and the pump inlet housing.

8. The method for manufacturing the components of the turbopump according to claim 6, characterized in that, The pump outlet housing and the pump inlet housing have a first mounting surface, and the pump end bearing seat and the pump inlet housing have a second mounting surface; Both the first mounting surface and the second mounting surface are parallel to the positioning shaft, and there is a clearance fit between the pump outlet housing and the pump inlet housing located on the first mounting surface, and a clearance fit between the pump end bearing seat and the pump inlet housing located on the second mounting surface.

9. The method for manufacturing the components of the turbopump according to claim 6, characterized in that, The pump end bearing housing is assembled into the positioning shaft and the pump inlet housing, including: The pump outlet housing and the pump inlet housing are machined to form a second locating pin hole; The second positioning pin is inserted into the second positioning pin hole to fix the pump outlet housing and the pump inlet housing; The pump inlet housing and the pump end bearing seat are machined to form a third locating pin hole; The third locating pin is inserted into the third locating pin hole to fix the pump inlet housing and the pump end bearing seat.

10. The method for manufacturing the components of the turbopump according to claim 1, characterized in that, The coefficient of linear expansion of the liquid nitrogen in the vortex end bearing housing is: The coefficient of linear expansion of the positioning shaft in liquid nitrogen is This makes the shrinkage dimension of the positioning shaft greater than the shrinkage dimension of the vortex end bearing seat; The positioning shaft is configured to inject liquid nitrogen between the first shaft hole and the positioning shaft during disassembly.

11. A method for manufacturing a component of a turbopump according to any one of claims 1-10, characterized in that, include: The machining accuracy of at least one of the vortex end bearing housing, the pump end bearing housing, the positioning shaft, the pump inlet housing, and the pump outlet housing is monitored in real time.

12. An accessory for a turbopump, characterized in that, Manufactured by the method of manufacturing components for a turbopump as described in any one of claims 1-11; The components of the turbopump include a vortex end bearing housing, a pump end bearing housing, a positioning shaft, a pump inlet housing, and a pump outlet housing. The vortex bearing housing is disposed inside the pump outlet housing, and the vortex bearing housing has a first shaft hole, with one end of the positioning shaft passing through the first shaft hole; The pump inlet housing is sleeved on the positioning shaft and connected to the pump outlet housing; The pump end bearing housing has a second shaft hole, and the pump end bearing housing is sleeved on the positioning shaft through the second shaft hole and connected to the pump inlet housing.

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