Assembling structure and assembling method for composite material guide pipe and stator of pump-jet propeller

Abstract

The invention discloses an assembly structure and an assembly method for a composite guide pipe and a stator of a pump-jet propeller. The assembly structure comprises a guide pipe and a stator, the guide pipe is divided into a small guide pipe end body and a large guide pipe end body along the middle of the pipe wall, the depth of the large guide pipe end body is smaller than that of the small guide pipe end body, and the stator is arranged in the large guide pipe end body after being of an integral structure composed of stator blades and a stator hub and connected with the large guide pipe end body to form a large guide pipe end combination structure. The assembly method comprises the following steps of: assembling the stator blades and the stator hub, assembling the guide pipe and the stator, and assembling the guide pipe large end body assembly and the guide pipe small end body to complete the assembly of the whole structure. According to the method, the assembling method of the stator blades and the stator hub is optimally designed, so that the overall precision of the assembled composite material stator can be ensured while the assembling process is ensured to be smoothly and efficiently completed; and through the assembly design of the conduit and the stator, the connection performance of the conduit and the stator is optimized, and the reliability of the structure and the convenience of installation and maintenance are ensured.

Description

Technical Field

[0001] This invention belongs to the field of composite material propulsion technology, specifically relating to an assembly structure and assembly method for a composite material duct and stator of a pump-jet propulsion system. Background Technology

[0002] In recent years, unmanned underwater vehicle (UUV) technology has developed rapidly and has become an important tool in marine scientific research, underwater operations, and military applications. Among them, pump-jet propulsion systems, with their advantages of high propulsion efficiency, low noise, lightweight, high strength, corrosion resistance, good maneuverability, low cavitation performance, and low maintenance costs, have gradually become the ideal choice for propulsion systems of modern ships and UUVs. These characteristics make them perform exceptionally well in application scenarios with high performance and stealth requirements.

[0003] Pump-jet propulsion (PJP) is an integrated propulsion device consisting of a stator, rotor, and duct. It is widely used due to its significant advantages, including low radiated noise, high propulsion efficiency, and excellent cavitation performance. Currently, most PJP propulsion devices are manufactured using metals. However, compared to metals, carbon fiber composites offer numerous significant advantages, including light weight, high strength-to-weight ratio, excellent designability, good fatigue resistance, and outstanding corrosion resistance. These characteristics make carbon fiber composites a promising candidate for PJP applications. The stator of a PJP propulsion device consists of a set of fixed blades at a specific angle to the fluid flow direction. Their main function is to absorb the energy generated by the rotor's rotation and to provide structural support for the duct.

[0004] Depending on the stator's position within the propeller, pump-jet propellers can be categorized into front-stator pump-jet propellers and rear-stator pump-jet propellers. In terms of duct design, a convergent structure with a larger inlet end and a smaller outlet end is typically used to optimize hydrodynamic performance. In the structural design of front-stator pump-jet propellers, a specific structural form exists: the rotor diameter is larger than the duct outlet end (small end), and the rotor must enter from the duct inlet end (large end). After rotor installation, the duct and stator are connected as a single unit. A detachable structure with screw connections between the stator and duct facilitates overall maintenance and replacement of the pump-jet propeller. However, designing bolt holes on the end faces of composite stator blades may damage the interlaminar properties of the blades. Furthermore, the mating surfaces between the stator blades and the duct are irregularly shaped arc surfaces, which can easily lead to clearances. These clearances can potentially generate gap eddies, adversely affecting the propeller's hydrodynamic performance and noise characteristics.

[0005] Currently, using integrated molding technology to fabricate stators can improve the overall integrity and reliability of the structure, but this method suffers from long production cycles and high mold costs. To reduce production costs and improve production efficiency, composite material stators for pump-jet propulsion systems are typically fabricated using a split structure, with stator blades and stator hubs molded separately. Due to the different connection structures of the stator blades and stator hubs, their assembly methods also differ. For structures where the stator blades and stator hubs are connected via tenon joints and adhesive bonding, a dedicated tooling for bonding the stator blades and stator hubs needs to be designed. This tooling ensures the positioning accuracy and connection reliability of the stator blades and stator hubs during the bonding process, thereby guaranteeing the performance and quality of the entire propulsion system. Summary of the Invention

[0006] To address the problems existing in the background technology, this invention provides an assembly structure and method for a composite material duct and stator of a pump-jet propulsion system. By optimizing the assembly method of the stator blades and stator hub, the assembly process is ensured to be completed smoothly and efficiently, while also guaranteeing the overall accuracy of the assembled composite material stator. The assembly design of the duct and stator optimizes the connection performance between the duct and stator, while ensuring the reliability of the structure and the convenience of installation and maintenance. This effectively eliminates the negative impact of the fit clearance between the stator blades and the duct on the performance of the pump-jet propulsion system, meets actual usage requirements, improves the overall performance and reliability of the propulsion system, and reduces production costs.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] An assembly structure for a composite material duct and stator of a pump-jet propulsion device includes a duct and a stator. The duct is designed as a two-section segmented structure, divided into a small end body and a large end body along the middle of the duct wall. The depth of the large end body is less than that of the small end body. The size of the large end body matches that of the stator. This segmented design facilitates manufacturing and assembly, while improving the overall integrity and reliability of the structure.

[0009] The stator, consisting of stator blades and a stator hub, is placed inside the large end body of the guide tube and connected thereto to form the large end assembly structure. The large end assembly is completely placed inside the larger diameter side of the small end body of the guide tube, and the outer wall of the large end body and the inner wall of the small end body are connected by bolts. The bolt connection achieves an integrated connection between the guide tube and the stator, ensuring the strength and reliability of the overall structure. That is, the large end body and the small end body of the guide tube adopt a detachable connection structure to achieve a detachable function.

[0010] The stator blades are designed with tenon structures at both ends. One end is connected to the stator hub, and the other end is connected to the inner wall of the large end of the guide tube by tenon and glue. This connection method not only improves the connection strength, but also reduces the mating clearance and reduces the generation of clearance eddy currents, thereby reducing energy loss and noise. The structural glue seals the mating clearance between the stator blades and the inner wall of the guide tube, effectively improving the dimensional accuracy of the inner surface of the guide tube.

[0011] The tenon section of the connection end between the stator blade and the large end of the guide tube is an acute triangle, and the inner wall of the large end of the guide tube is designed with a matching triangular tenon groove. The number of tenons grooves on the inner wall of the large end of the guide tube matches the number of stator blades. The fit clearance between the tenon groove on the inner wall of the large end of the guide tube and the tenon of the stator blade is 0.2 to 0.5 mm, and is filled with connecting adhesive.

[0012] Furthermore, the connecting bolts between the large end body and the small end body of the conduit described in this invention are circumferentially distributed, and 1 to 4 screws are installed between every two stator blades. The threaded sleeves are installed on the outer surface of the large end body of the conduit, and the screws are installed in the circumferentially distributed countersunk bolt holes on the small end body of the conduit. The bolt connection holes provided on the large end body of the conduit are evenly distributed circumferentially between the two stator blades. The connecting bolts, screws, threaded sleeves, bolt connection holes, and countersunk bolt holes correspond one-to-one. The small end body of the conduit has countersunk bolt holes, and the large end body of the conduit is fitted with threaded sleeves to ensure the reliability and durability of the bolt connection.

[0013] Furthermore, the mating surfaces between the large end body and the small end body of the catheter described in this invention are divided into the inner wall mating surface, the axial mating surface, and the outer wall mating surface. The gap between the mating surfaces is determined by the two-section segmented catheter assembly structure. The gap design ensures a tight connection between the catheter and the stator and good hydrodynamic performance.

[0014] The axial mating surface of the catheter is designed with a straight section and an inclined section. The inclined section has an oblique angle design with the central axis of the catheter, which has a guiding function and can improve the smoothness of the assembly process. The straight section is parallel to the central axis of the catheter, which can ensure that the large end body and the small end body of the catheter are coaxial and play a positioning role.

[0015] The outer wall mating surface of the catheter is located at a distance of more than 10mm from the large end of the catheter, which can ensure the structural strength of the large end port of the catheter.

[0016] The clearance between the outer wall mating surface and the axial mating surface of the conduit is a non-critical mating dimension, which has little impact on hydrodynamics, and the design value is 0.2 to 0.5 mm.

[0017] The mating gap of the inner wall of the conduit is ≤0.2mm. This design helps to reduce the interference of the mating gap on the water flow inside the conduit. The distance between the mating surface of the outer wall of the conduit and the sharp corner of the triangular tenon of the stator blade is about 5-10mm. The right-angle corner of the conduit mating surface is designed with a rounded transition to reduce stress concentration and improve the durability of the structure.

[0018] Furthermore, the stator blades and stator hub described in this invention are connected into an integral structure by tenon joints and adhesive bonding using special assembly tooling, ensuring the accuracy and reliability of the connection;

[0019] The special assembly fixture for the stator blades and stator hub includes a bottom main platform, a central support disc, a stator blade pressure surface support platform, and a stator blade suction surface adjustment pressure plate.

[0020] The bottom main platform is a hollow cylinder, and the inner diameter of the through hole in the center is equal to the inner diameter of the hole in the central support disk. The central support disk is integrally formed after being welded to the bottom main platform. The center of the central support disk is consistent with the center of the through hole to determine the spatial position relationship of the central support disk.

[0021] The bottom main platform is designed with positioning pin holes based on the center of the central through hole of the bottom main platform and connecting screws are distributed circumferentially on the top.

[0022] The stator blade pressure surface support platforms are evenly distributed along the circumference of the bottom main platform and are connected to the bottom main platform by connecting screws. The distance between the platform and the center of the bottom main platform, as well as the gap between every two support platforms, depends on the size of the stator blade and the distance between the stator blades. The final spatial distribution of the stator blades determines the position of the support platforms. The stator blade pressure surface support platforms are in contact with a portion of the stator blade, and their size is related to the size of the blade.

[0023] The top of the stator blade pressure surface support platform is a connecting end and is provided with connecting screw holes. A stator blade limiting groove is provided on the lower side of the positioning assembly surface, and the two sides of the positioning assembly surface are stator blade side positioning lines. The positioning assembly surface and the stator blade suction surface adjusting pressure plate are connected by screws. The stator blade is placed between the positioning assembly surface and the stator blade suction surface adjusting pressure plate. The stator blade pressure surface is in contact with the positioning assembly surface, and the stator blade suction surface is in contact with the inner surface of the stator blade suction surface adjusting pressure plate.

[0024] The positioning assembly surface and the inner surface of the stator blade suction surface adjusting pressure plate are both irregular surfaces, and their surface dimensions are machined according to the surface between the positioning marking lines of the stator blade pressure surface and the stator blade suction surface, respectively; the positioning assembly surface is located in the middle of the stator blade pressure surface, and the width of the positioning assembly surface is about 100-200mm.

[0025] Furthermore, a 3-5mm rubber buffer layer is disposed between the stator blade suction surface adjusting pressure plate and the stator blade suction surface in the present invention.

[0026] Furthermore, the stator hub metal part to be assembled in this invention is connected to the central support disk by screws to determine the spatial positional relationship of the stator hub relative to the center point of the bottom main platform.

[0027] The central support disk is connected to the stator hub metal part via a bolt connection platform, and the height of the central support disk is greater than the depth from the small end of the stator hub metal part to the bolt connection platform.

[0028] Furthermore, the assembly method of the stator blades and stator hub of the present invention includes:

[0029] ① Assembly tooling: First, place the bottom main platform on the installation platform, and then connect the bottom main platform to the stator blade pressure surface support platform with screws and pins;

[0030] ② Gap inspection: Use a feeler gauge to check the gap between the mating surfaces of the bottom main platform and the stator blade pressure surface support platform. The mating gap should be less than 0.05mm.

[0031] ③ Installation of stator hub: Based on the relative position of the screw holes in the bolt connection platform, tighten the screws in sequence to connect the stator hub to the central support disc, and measure the fit clearance between the stator hub and the assembly tooling. The fit clearance should be less than 0.05mm.

[0032] ④ Connection and positioning of stator hub and stator blade: First, place a stator blade on the positioning assembly surface of the stator blade pressure surface support platform, and insert the stator blade tenon into the stator hub tenon groove. The positioning marking lines of the stator blade are flush with the two end faces of the stator blade pressure surface support platform. Then, adjust the stator blade guide edge to fit into the limiting groove of the stator blade pressure surface support platform.

[0033] ⑤ Gap inspection: Use a feeler gauge to check the gap between the stator blade pressure surface and the positioning assembly surface of the stator blade pressure surface support platform. Adjust the gap to be less than 0.05mm, which means that the fit is in place.

[0034] ⑥ Install stator blades: Apply an appropriate amount of connecting adhesive to the side of the stator blade tenon and the stator hub tenon groove. Following steps ④ and ⑤, reposition the stator blades to the appropriate installation position. Install the stator blade suction surface adjustment plate and tighten the plate symmetrically in a cross pattern.

[0035] ⑦ Repeat steps ④, ⑤, and ⑥ to complete the installation of the remaining stator blades;

[0036] ⑧ After the adhesive has cured, remove the stator blade suction face plate at once, and slowly lift the stator away using an overhead crane or similar equipment.

[0037] Furthermore, the present invention also provides a method for assembling a composite material duct and stator of a pump-jet propulsion system, comprising the following steps:

[0038] (1) Assembly of stator blades and stator hub: The stator hub and stator blades are connected by tenon joint and glue joint through stator assembly tooling;

[0039] (2) Assembly of the conduit and the stator: Using special tooling, the large end of the conduit and the stator are tightly connected by tenon joint and glue to form an integral structure, thus obtaining the conduit large end assembly;

[0040] The main structure of the special tooling in step (2) is a large disc with a central cylinder. The center point of the disc is used as the installation reference. The small end of the large end of the guide tube is connected to the disc by a boss, and the stator is connected to the central cylinder by a positioning pin.

[0041] (3) Assembly of the large end body assembly and the small end body of the conduit: Install a threaded sleeve on the outer wall of the large end body of the conduit to ensure that the installation position of the threaded sleeve is accurate; hoist the assembly after the large end body of the conduit is connected to the stator into the small end body of the conduit and align it with the screw mounting holes to ensure that the mounting holes are aligned; adjust the relative position of the assembly and the small end body of the conduit to make the axial fit clearance of the outer wall uniform and consistent, and then connect the screws to complete the assembly of the entire structure; when it is necessary to disassemble the conduit and the stator in the future, simply remove the connecting screws and hoist the assembly away, which is simple and quick to operate.

[0042] Through the above design and implementation methods, the present invention not only improves the assembly efficiency and reliability of the pump-jet propulsion stator, but also reduces maintenance costs and enhances overall performance.

[0043] Furthermore, when the rotor needs to be installed, the connecting bolts are removed, the large end assembly of the conduit is lifted off the ground, the rotor is installed into the inner wall of the conduit, and the small end assembly and the large end assembly of the conduit are reassembled to complete the rotor installation. This design makes the installation and maintenance of the rotor more convenient.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] (1) This invention provides an assembly tooling and corresponding assembly method for large-size, low-cost composite material stators with a specific structural form (i.e., stator hub and stator blades are connected by tenon joint and adhesive joint). The design of connecting the central support disc and the stator blade pressure surface support platform as a whole through the bottom main platform can reduce production costs and ensure assembly accuracy. The central support disc is used to determine the unique spatial position of the center point of the stator hub and the bottom main platform, and the stator blade pressure surface support platform is used to determine the unique spatial position of the center point of the stator blade and the bottom main platform. The blade position is finely adjusted by controlling the gap of each mating surface, thereby achieving precise positioning. The bottom main platform is used to accurately position the relative positions between each blade and between each blade and the stator hub. The stator blade suction surface pressure plate and the stator blade pressure surface support platform together complete the fixing of all blade connection adhesive curing processes.

[0046] (2) The assembly tooling for stator blades and stator hubs of the present invention has a simple structure and the materials are easy to obtain, which makes the tooling manufacturing cost low and the assembly operation easy; it solves the problem of actual stator assembly operation, and the performance of the assembled stator can meet the usage requirements; and it is particularly suitable for the assembly of stators with multiple blades (≥7 blades) and stator hubs with tenon joints and adhesive bonding.

[0047] (3) Reduce the fitting clearance: By optimizing the connection structure, the fitting clearance between the stator blades and the guide tube can be effectively reduced, the generation of gap eddy currents can be reduced, thereby reducing energy loss and noise;

[0048] (4) Improve interlayer performance: Avoid designing bolt connection holes on the end face of composite stator blades, thereby reducing damage to the interlayer performance of the blades and improving the overall strength and durability of the blades;

[0049] (5) Easy to maintain and replace: The detachable connection structure allows the various parts of the catheter to be easily disassembled when needed, making it easy to inspect, maintain and replace, reducing maintenance costs and time.

[0050] (6) Improved overall performance and reliability: The optimized connection method and structural design significantly improve the overall performance and reliability of the thruster, making it suitable for high-performance propulsion systems. Attached Figure Description

[0051] Figure 1 This is a schematic diagram of the overall assembly structure of the composite material conduit and stator of the present invention.

[0052] Figure 2 This is a partial sectional view of the connection position between the composite material duct and the stator blade of the present invention; S1 is the clearance between the tenon and the mortise; S2 is the inner wall mating surface of the duct; S3 is the axial mating surface of the duct; S4 is the outer wall mating surface of the duct; S5 is the distance between the outer wall mating surface of the duct and the large end of the duct.

[0053] Figure 3 This is a partial cross-sectional view of the connection between the large end assembly and the small end assembly of the composite material catheter of the present invention.

[0054] Figure 4 This is a schematic diagram showing the disassembled assembly structure of the composite material conduit and stator of the present invention.

[0055] Figure 5 This is a schematic diagram of the stator-stator hub connection structure of the present invention.

[0056] Figure 6 This is a schematic diagram of the structure of the large end of the composite material conduit of the present invention.

[0057] Figure 7 The first part is a cross-sectional view of the large end of the composite material conduit of the present invention; the second part is a cross-sectional view of the tenon groove area; the third part is a cross-sectional view of the non-tenon groove area; the fourth part is a cross-sectional view of the axial end face of the tenon groove; the fifth part is a horizontal end face of the tenon groove; and the sixth part is a straight section of the tenon groove mating surface.

[0058] Figure 8 This is a schematic diagram of the connection structure between the large end of the composite material conduit and the stator of the present invention.

[0059] Figure 9 The first image shows a cross-sectional view of the composite material conduit large end body and stator assembly of the present invention; S11 is a cross-sectional view of the stator hub, and S12 is a cross-sectional view of the conduit large end body.

[0060] Figure 10 This is a schematic diagram of the small end of the composite material conduit of the present invention.

[0061] Figure 11 This is a cross-sectional view of the small end of the composite material conduit of the present invention.

[0062] Figure 12 This is a schematic diagram of the special assembly tooling structure for stator blades and stator hubs of the present invention.

[0063] Figure 13 This is a schematic diagram of the bottom main platform structure of the present invention.

[0064] Figure 14 This is a schematic diagram of the central support disk structure of the present invention.

[0065] Figure 15 This is a schematic diagram of the stator blade pressure surface support platform structure of the present invention.

[0066] Figure 16 This is a schematic diagram of the assembly structure of the stator hub and the special assembly tooling of the present invention.

[0067] Figure 17 This is a cross-sectional view of the stator hub of the present invention after assembly with the special assembly tooling.

[0068] Figure 18 A schematic diagram of the assembly structure of the stator blades, stator hub and special assembly tooling for the invention.

[0069] Figure 19 This is a schematic diagram showing the connection and positioning of the stator blade and the stator blade pressure surface support platform of the present invention.

[0070] The following are labeled in the diagram: 1. Small end of the guide tube; 2. Large end of the guide tube; 3. Stator blade; 4. Stator hub; 5. Tenon; 6. Screw; 7. Bolt; 8. Screw sleeve; 9. Bolt countersunk hole; 10. Bolt connection hole; 11. Tenon; 12. Stator hub tenon; 13. Bottom main platform; 14. Central support disc; 15. Stator blade suction surface adjustment plate; 16. Stator blade pressure surface support platform; 17. Positioning pin hole; 18. Connecting screw; 19. Bolt connection platform; 20. Operating window; 21. Connecting screw hole; 22. Stator blade limiting groove; 23. Stator blade assembly surface; 24. Stator blade pressure surface positioning marking line. Detailed Implementation

[0071] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0072] An assembly structure for a composite material duct and stator of a pump-jet propulsion device includes a duct and a stator. The duct is designed as a two-section segmented structure, divided into a small end body 1 and a large end body 2 along the middle of the duct wall. The depth of the large end body is less than that of the small end body. The size of the large end body matches that of the stator. This segmented design facilitates manufacturing and assembly, while improving the overall integrity and reliability of the structure.

[0073] The stator, consisting of stator blades 3 and stator hub 4, is placed inside the large end body 2 of the guide tube and connected thereto to form the large end assembly structure of the guide tube. The large end assembly of the guide tube is completely placed inside the larger diameter side of the small end body of the guide tube, and the outer wall of the large end body of the guide tube and the inner wall of the small end body of the guide tube are connected by bolts 7. The connection of bolts 7 realizes the integral connection between the guide tube and the stator, ensuring the strength and reliability of the overall structure. That is, the large end body of the guide tube and the small end body of the guide tube adopt a detachable connection structure to realize the detachable function.

[0074] The stator blade 3 is designed with tenon structure at both ends. One end is connected to the stator hub 4, and the other end is connected to the inner wall of the large end body 2 of the guide tube by tenon and glue. This connection method not only improves the connection strength, but also reduces the fit clearance and reduces the generation of gap eddy current, thereby reducing energy loss and noise. The structural glue seals the fit clearance between the stator blade and the inner wall of the guide tube, effectively improving the dimensional accuracy of the inner surface of the guide tube.

[0075] The tenon section of the connection end between the stator blade 3 and the large end body 2 of the guide tube is an acute triangle. At the same time, the inner wall of the large end body of the guide tube is designed with a matching triangular tenon groove 5. The number of tenon grooves 5 on the inner wall of the large end body of the guide tube matches the number of stator blades. The fit clearance between the tenon groove 5 on the inner wall of the large end body of the guide tube and the tenon 11 of the stator blade is 0.2 to 0.5 mm and is filled with connecting glue.

[0076] The connecting bolts 7 between the large end body 2 and the small end body 1 of the conduit described in this invention are distributed circumferentially, and 1 to 4 screws are installed between every two stator blades. The screw sleeves are installed on the outer surface of the large end body of the conduit, and the screws are installed in the countersunk bolt holes distributed circumferentially on the small end body of the conduit. The bolt connection holes provided on the large end body of the conduit are evenly distributed circumferentially between the two stator blades. The connecting bolts 7, screws 6, screw sleeves 8, bolt connection holes 10, and bolt countersunk bolt holes 9 correspond one-to-one. The small end body of the conduit has bolt countersunk holes, and the large end body of the conduit is fitted with screw sleeves to ensure the reliability and durability of the bolt connection.

[0077] The mating surfaces between the large end body 2 and the small end body 1 of the catheter described in this invention are divided into the inner wall mating surface, the axial mating surface, and the outer wall mating surface. The gap between the mating surfaces is determined by the two-section segmented catheter assembly structure. The gap design ensures a tight connection between the catheter and the stator and good hydrodynamic performance.

[0078] The axial mating surface of the catheter is designed with a straight section and an inclined section. The inclined section has an oblique angle design with the central axis of the catheter, which has a guiding function and can improve the smoothness of the assembly process. The straight section is parallel to the central axis of the catheter, which can ensure that the large end body and the small end body of the catheter are coaxial and play a positioning role.

[0079] The outer wall mating surface of the catheter is located at a distance of more than 10mm from the large end of the catheter, which can ensure the structural strength of the large end port of the catheter.

[0080] The clearance between the outer wall mating surface and the axial mating surface of the conduit is a non-critical mating dimension, which has little impact on hydrodynamics, and the design value is 0.2 to 0.5 mm.

[0081] The mating gap of the inner wall of the conduit is ≤0.2mm. This design helps to reduce the interference of the mating gap on the water flow inside the conduit. The distance between the mating surface of the outer wall of the conduit and the sharp corner of the triangular tenon of the stator blade is about 5-10mm. The right-angle corner of the conduit mating surface is designed with a rounded transition to reduce stress concentration and improve the durability of the structure.

[0082] The stator blades 3 and stator hub 4 described in this invention are connected into an integral structure by tenon joints and adhesive bonding using special assembly tooling, ensuring the accuracy and reliability of the connection;

[0083] The special assembly fixture for the stator blades and stator hub includes a bottom main platform, a central support disc, a stator blade pressure surface support platform, and a stator blade suction surface adjustment pressure plate.

[0084] The bottom main platform is a hollow cylinder, and the inner diameter of the through hole in the center is equal to the inner diameter of the hole in the central support disk. The central support disk is integrally formed after being welded to the bottom main platform. The center of the central support disk is consistent with the center of the through hole to determine the spatial position relationship of the central support disk.

[0085] The bottom main platform is designed with positioning pin holes based on the center of the central through hole of the bottom main platform and connecting screws are distributed circumferentially on the top.

[0086] The stator blade pressure surface support platforms are evenly distributed along the circumference of the bottom main platform and are connected to the bottom main platform by connecting screws. The distance between the platform and the center of the bottom main platform, as well as the gap between every two support platforms, depends on the size of the stator blade and the distance between the stator blades. The final spatial distribution of the stator blades determines the position of the support platforms. The stator blade pressure surface support platforms are in contact with a portion of the stator blade, and their size is related to the size of the blade.

[0087] The top of the stator blade pressure surface support platform is a connecting end and is provided with connecting screw holes. A stator blade limiting groove is provided on the lower side of the positioning assembly surface, and the two sides of the positioning assembly surface are stator blade side positioning lines. The positioning assembly surface and the stator blade suction surface adjusting pressure plate are connected by screws. The stator blade is placed between the positioning assembly surface and the stator blade suction surface adjusting pressure plate. The stator blade pressure surface is in contact with the positioning assembly surface, and the stator blade suction surface is in contact with the inner surface of the stator blade suction surface adjusting pressure plate.

[0088] The positioning assembly surface and the inner surface of the stator blade suction surface adjusting pressure plate are both irregular surfaces, and their surface dimensions are machined according to the surface between the positioning marking lines of the stator blade pressure surface and the stator blade suction surface, respectively; the positioning assembly surface is located in the middle of the stator blade pressure surface, and the width of the positioning assembly surface is about 100-200mm.

[0089] The stator blade suction surface adjustment pressure plate of the present invention is provided with a 3-5mm rubber buffer layer between it and the stator blade suction surface.

[0090] The stator hub metal part to be assembled in this invention is connected to the central support disk by screws to determine the spatial position relationship of the stator hub relative to the center point of the bottom main platform.

[0091] The central support disk is connected to the stator hub metal part via a bolt connection platform, and the height of the central support disk is greater than the depth from the small end of the stator hub metal part to the bolt connection platform.

[0092] The assembly method of stator blades and stator hub according to the present invention includes:

[0093] ① Assembly tooling: First, place the bottom main platform on the installation platform, and then connect the bottom main platform to the stator blade pressure surface support platform with screws and pins;

[0094] ② Gap inspection: Use a feeler gauge to check the gap between the mating surfaces of the bottom main platform and the stator blade pressure surface support platform. The mating gap should be less than 0.05mm.

[0095] ③ Installation of stator hub: Based on the relative position of the screw holes in the bolt connection platform, tighten the screws in sequence to connect the stator hub to the central support disc, and measure the fit clearance between the stator hub and the assembly tooling. The fit clearance should be less than 0.05mm.

[0096] ④ Connection and positioning of stator hub and stator blade: First, place a stator blade on the positioning assembly surface of the stator blade pressure surface support platform, and insert the stator blade tenon into the stator hub tenon groove. The positioning marking lines of the stator blade are flush with the two end faces of the stator blade pressure surface support platform. Then, adjust the stator blade guide edge to fit into the limiting groove of the stator blade pressure surface support platform.

[0097] ⑤ Gap inspection: Use a feeler gauge to check the gap between the stator blade pressure surface and the positioning assembly surface of the stator blade pressure surface support platform. Adjust the gap to be less than 0.05mm, which means that the fit is in place.

[0098] ⑥ Install stator blades: Apply an appropriate amount of connecting adhesive to the side of the stator blade tenon and the stator hub tenon groove. Following steps ④ and ⑤, reposition the stator blades to the appropriate installation position. Install the stator blade suction surface adjustment plate and tighten the plate symmetrically in a cross pattern.

[0099] ⑦ Repeat steps ④, ⑤, and ⑥ to complete the installation of the remaining stator blades;

[0100] ⑧ After the adhesive has cured, remove the stator blade suction face plate at once, and slowly lift the stator away using an overhead crane or similar equipment.

[0101] The present invention also provides a method for assembling a composite material duct and stator of a pump-jet propulsion system, comprising the following steps:

[0102] (1) Assembly of stator blades and stator hub: The stator hub and stator blades are connected by tenon joint and glue joint through stator assembly tooling;

[0103] (2) Assembly of the conduit and the stator: Using special tooling, the large end of the conduit and the stator are tightly connected by tenon joint and glue to form an integral structure, thus obtaining the conduit large end assembly;

[0104] The main structure of the special tooling in step (2) is a large disc with a central cylinder. The center point of the disc is used as the installation reference. The small end of the large end of the guide tube is connected to the disc by a boss, and the stator is connected to the central cylinder by a positioning pin.

[0105] (3) Assembly of the large end body assembly and the small end body of the conduit: Install a threaded sleeve on the outer wall of the large end body of the conduit to ensure that the installation position of the threaded sleeve is accurate; hoist the assembly after the large end body of the conduit is connected to the stator into the small end body of the conduit and align it with the screw mounting holes to ensure that the mounting holes are aligned; adjust the relative position of the assembly and the small end body of the conduit to make the axial fit clearance of the outer wall uniform and consistent, and then connect the screws to complete the assembly of the entire structure; when it is necessary to disassemble the conduit and the stator in the future, simply remove the connecting screws and hoist the assembly away, which is simple and quick to operate.

[0106] Through the above design and implementation methods, the present invention not only improves the assembly efficiency and reliability of the pump-jet propulsion stator, but also reduces maintenance costs and enhances overall performance.

[0107] When the rotor needs to be installed, this invention involves removing the connecting bolts, lifting the large end assembly of the conduit, installing the rotor into the inner wall of the conduit, and then reassembling the small end assembly and the large end assembly of the conduit to complete the rotor installation. This design makes the installation and maintenance of the rotor more convenient.

Claims

1. An assembly structure for a composite material duct and stator of a pump-jet propulsion system, characterized in that: It includes a conduit and a stator. The conduit is designed as a two-section segmented structure, which is divided into a small end body (1) and a large end body (2) along the middle of the conduit wall. The depth of the large end body is less than that of the small end body, and the size of the large end body matches that of the stator. The stator is composed of stator blades (3) and stator hub (4) forming an integral structure, which is then placed inside the large end body (2) of the conduit and connected to it to form the large end assembly structure of the conduit; the large end assembly of the conduit is completely placed inside the larger diameter side of the small end body of the conduit, and the outer wall of the large end body of the conduit and the inner wall of the small end body of the conduit are connected by bolts (7). The stator blade (3) is designed with tenon structure at both ends. One end is connected to the stator hub (4), and the other end is connected to the inner wall of the guide tube large end body (2) by tenon and glue. The tenon section of the connection end between the stator blade (3) and the large end of the guide tube is an acute triangle. At the same time, the inner wall of the large end of the guide tube is designed with a matching triangular tenon groove (5). The number of tenons grooves on the inner wall of the large end of the guide tube matches the number of stator blades. The fit gap between the tenon groove (5) on the inner wall of the large end of the guide tube and the tenon (11) of the stator blade is 0.2 to 0.5 mm and is filled with connecting glue.

2. The assembly structure of the composite material duct and stator of the pump-jet propulsion device according to claim 1, characterized in that, The connecting bolts (7) between the large end body (2) and the small end body (1) of the guide tube are distributed in a circumferential manner, and 1 to 4 screws (6) are installed between every two stator blades (3). The screw sleeves (8) are installed on the outer surface of the large end body (2) of the guide tube, and the screws (6) are installed in the countersunk bolt holes (9) distributed in a circumferential manner on the small end body of the guide tube. The bolt connection holes (10) provided on the large end body (2) of the guide tube are evenly distributed in a circumferential manner between the two stator blades (3). The connecting bolts (7), screws (6), screw sleeves (8), bolt connection holes (10), and bolt countersunk holes (9) correspond one-to-one.

3. The assembly structure of the composite material duct and stator of the pump-jet propulsion device according to claim 2, characterized in that, The mating surfaces between the large end body (2) and the small end body (1) of the catheter are divided into the inner wall mating surface, the axial mating surface, and the outer wall mating surface. The axial mating surface of the catheter is designed with a straight section and an inclined section, and the inclined section has an oblique angle design with the central axis of the catheter; The outer wall mating surface of the catheter is located at a distance of more than 10 mm from the large end of the catheter. The design clearance between the outer wall mating surface and the axial mating surface of the catheter is 0.2–0.5 mm. The inner wall mating surface of the guide tube has a mating gap of ≤0.2mm, the outer wall mating surface of the guide tube is about 5-10mm away from the sharp corner of the triangular tenon of the stator blade, and the right-angle corner of the guide tube mating surface is designed with a rounded transition.

4. The assembly structure of the composite material duct and stator of the pump-jet propulsion device according to claim 3, characterized in that, The stator blades (3) and stator hub (4) are connected into an integral structure by tenon joint and glue joint using special assembly tooling. The special assembly tooling for the stator blades and stator hub includes a bottom main platform (13), a central support disc (14), a stator blade pressure surface support platform (16), and a stator blade suction surface adjustment pressure plate (15). The bottom main platform (13) is a hollow cylinder, and the inner diameter of the through hole in the center is equal to the inner diameter of the hole in the central support disk (14). The central support disk (14) and the bottom main platform (13) are welded together and integrally formed. The center of the central support disk is consistent with the center of the through hole. The bottom main platform (13) is designed with positioning pin holes (17) based on the center of the central through hole of the bottom main platform and connecting screws (18) are distributed circumferentially on the top. The stator blade pressure surface support platform (16) is evenly distributed along the circumference of the bottom main platform and is connected to the bottom main platform (13) by connecting screws (18). The distance between the platform and the center of the bottom main platform and the gap between each pair of support platforms depend on the size of the stator blade and the distance between the stator blades. The top of the stator blade pressure surface support platform (16) is a connecting end and is provided with connecting screw holes (21). The lower side of the positioning assembly surface is provided with a stator blade limiting groove (22). The two sides of the positioning assembly surface are stator blade side positioning lines. The positioning assembly surface and the stator blade suction surface adjustment plate are connected by screws. The stator blade is placed between the positioning assembly surface and the stator blade suction surface adjustment plate. The stator blade pressure surface is in contact with the positioning assembly surface, and the stator blade suction surface is in contact with the inner surface of the stator blade suction surface adjustment plate. The positioning assembly surface and the inner surface of the stator blade suction surface adjusting pressure plate are both irregular surfaces, and their surface dimensions are machined according to the surface between the positioning marking lines of the stator blade pressure surface and the stator blade suction surface, respectively; the positioning assembly surface is located in the middle of the stator blade pressure surface, and the width of the positioning assembly surface is about 100-200mm.

5. The assembly structure of the composite material duct and stator of the pump-jet propulsion device according to claim 4, characterized in that, A 3-5mm rubber buffer layer is provided between the stator blade suction surface adjustment pressure plate and the stator blade suction surface.

6. The assembly structure of the composite material duct and stator of the pump-jet propulsion device according to claim 5, characterized in that, The central support disk (14) is connected to the stator hub metal part through a bolt connection platform (19), and the height of the central support disk is greater than the depth from the small end port of the stator hub metal part to the bolt connection platform.

7. The assembly structure of the composite material duct and stator of the pump-jet propulsion device according to claim 6, characterized in that, The method for assembling the stator blades and the stator hub includes: ① Assembly tooling: First, place the bottom main platform on the installation platform, and then connect the bottom main platform to the stator blade pressure surface support platform with screws and pins; ② Gap inspection: Use a feeler gauge to check the gap between the mating surfaces of the bottom main platform and the stator blade pressure surface support platform. The mating gap should be less than 0.05mm. ③ Installation of stator hub: Based on the relative position of the screw holes in the bolt connection platform, tighten the screws in sequence to connect the stator hub to the central support disc, and measure the fit clearance between the stator hub and the assembly tooling. The fit clearance should be less than 0.05mm. ④ Connection and positioning of stator hub and stator blade: First, place a stator blade on the positioning assembly surface of the stator blade pressure surface support platform, and insert the stator blade tenon into the stator hub tenon groove. The positioning marking lines of the stator blade are flush with the two end faces of the stator blade pressure surface support platform. Then, adjust the stator blade guide edge to fit into the limiting groove of the stator blade pressure surface support platform. ⑤ Gap inspection: Use a feeler gauge to check the gap between the stator blade pressure surface and the positioning assembly surface of the stator blade pressure surface support platform. Adjust the gap to be less than 0.05mm, which means that the fit is in place. ⑥ Install stator blades: Apply an appropriate amount of connecting adhesive to the side of the stator blade tenon and the stator hub tenon groove. Following steps ④ and ⑤, reposition the stator blades to the appropriate installation position. Install the stator blade suction surface adjustment plate and tighten the plate symmetrically in a cross pattern. ⑦ Repeat steps ④, ⑤, and ⑥ to complete the installation of the remaining stator blades; ⑧ After the adhesive has cured, remove the stator blade suction face plate at once, and slowly lift the stator away using an overhead crane or similar equipment.

8. A method for assembling a composite material duct and stator of a pump-jet propulsion system according to any one of claims 1 to 7, characterized in that, Includes the following steps: (1) Assembly of stator blades and stator hub: The stator hub and stator blades are connected by tenon joint and glue joint through stator assembly tooling; (2) Assembly of the conduit and the stator: Using special tooling, the large end of the conduit and the stator are tightly connected by tenon joint and glue to form an integral structure, thus obtaining the conduit large end assembly; (3) Assembly of the large end body assembly and the small end body of the conduit: Install a threaded sleeve on the outer wall of the large end body of the conduit to ensure that the installation position of the threaded sleeve is accurate; hoist the assembly after the large end body of the conduit is connected to the stator into the small end body of the conduit and align it with the screw mounting holes to ensure that the mounting holes are aligned; adjust the relative position of the assembly and the small end body of the conduit to make the axial fit clearance of the outer wall uniform and consistent, and then connect the screws to complete the assembly of the entire structure.

9. The assembly method according to claim 8, characterized in that, The main structure of the special tooling in step (2) is a large disc with a central cylinder. The center point of the disc is used as the installation reference. The small end of the large end of the guide tube is positioned and connected to the disc through a boss. The stator is positioned and connected to the central cylinder through a positioning pin.

10. The assembly method according to claim 8, characterized in that, When it is necessary to install the rotor, remove the connecting bolts, lift the large end assembly of the conduit, install the rotor into the inner wall of the conduit, and reassemble the small end assembly and the large end assembly of the conduit to complete the rotor installation.

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