Efficient pump section model test device for guide vane type mixed-flow pump

Abstract

The invention relates to the technical field of pump model tests, and discloses an efficient guide vane type mixed-flow pump section model test device, which comprises a sectional type pump section group and an adjusting mechanism, and is characterized in that the sectional type pump section group comprises a water inlet taper pipe, a guide vane body, an impeller chamber, a water outlet elbow pipe and a support ring which are detachably connected; the impeller chamber is of a sectioning structure, two blade observation windows are symmetrically arranged on the two sides of the impeller chamber, and the length of the blade observation windows in the downstream direction is larger than that of blades at all angles in the downstream direction. According to the efficient pump section model test device for the guide vane type mixed-flow pump, disassembly and assembly convenience, observation comprehensiveness, adjustment precision and operation stability are achieved, and high relevance between test data and actual working conditions is guaranteed; the problems that an existing pump section model test device of the mixed-flow pump is tedious to disassemble and assemble, incomplete in observation, low in adjustment precision, poor in test data reliability and insufficient in operation stability are solved.

Description

Technical Field

[0001] This invention relates to the field of pump model testing equipment technology, specifically to a high-efficiency guide vane type mixed flow pump section model testing equipment. Background Technology

[0002] Model pump section testing is a core test in the pump research and development and design verification process. Its purpose is to verify and optimize the hydraulic performance, operational stability, and cavitation characteristics of the flow components, providing a scientific basis for the design, manufacturing, and safe operation of the prototype pump. Specifically, it can be divided into the following aspects: verifying hydraulic performance design indicators; evaluating cavitation performance and mitigating cavitation risks; testing operational stability and suppressing vibration and noise; and providing similarity basis for prototype pump conversion. Based on the pump similarity law, the test data of the model pump section are converted to the prototype pump to predict the performance parameters of the prototype pump, reducing the cost and risk of direct prototype pump testing. Simultaneously, the accuracy of the similarity conversion is verified to ensure the similarity of hydraulic characteristics between the model and the prototype. For different flow component design schemes of the same pump type (such as different numbers of blades or guide vanes), performance differences are compared through pump section testing to select the optimal design scheme and shorten the research and development cycle.

[0003] Existing mixed-flow pump section model test devices have several shortcomings: First, the impeller chambers are mostly integral structures, which are cumbersome to disassemble and assemble, requiring a lot of time for disassembly during on-site testing, making it difficult to adapt to the rapid replacement requirements of multiple operating conditions and multiple impellers; Second, the blade flow state observation device is poorly designed, with a limited observation range, unable to adapt to complete flow state observation under different blade angles, and the observation components are prone to wear and difficult to repair after transparency decay; Third, blade angle adjustment often requires disassembling the impeller, resulting in low adjustment accuracy and complex operation, making it difficult to quickly adapt to different test conditions; Fourth, the clearance control accuracy of the flow components is low, and the material and roughness configuration is unreasonable, easily leading to problems such as clearance leakage and excessive hydraulic loss, resulting in poor correlation between test data and actual operating conditions; Fifth, the overall structural stability of the device is insufficient, the reliability of torque transmission is poor, making it difficult to adapt to forward and reverse dual-condition tests, and vibration easily causes clearance deviation, affecting test accuracy.

[0004] To address the aforementioned issues, there is an urgent need to design a high-efficiency guide vane type mixed-flow pump section model test device that is easy to assemble and disassemble, allows for comprehensive observation, precise adjustment, stable operation, and reliable test data, in order to meet the experimental needs of mixed-flow pump hydraulic performance optimization and flow regime research. Summary of the Invention

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides an improved high-efficiency guide vane type mixed-flow pump section model test device, which achieves convenient disassembly and assembly, comprehensive observation, precise adjustment, and stable operation, ensuring a high degree of correlation between test data and actual operating conditions; it solves the problems of cumbersome disassembly and assembly, incomplete observation, low adjustment precision, poor reliability of test data, and insufficient operational stability of existing mixed-flow pump section model test devices.

[0006] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: A high-efficiency guide vane type mixed flow pump section model test device includes a segmented pump section group and an adjustment mechanism. The segmented pump section group includes a detachably connected inlet cone pipe, guide vane body, impeller chamber, outlet bend pipe and support ring. The impeller chamber adopts a segmented structure, and the segmented surface connecting parts adopt a tapered pin and threaded structure for detachable connection; the impeller chamber adopts a half-segmented structure, and its outer wall is equipped with lifting lugs for easy hoisting and disassembly; the segmented surface pin adopts a tapered pin and small-end thread structure to achieve quick positioning and disassembly, reducing the difficulty of maintenance and repair of the test device.

[0007] The impeller chamber is symmetrically provided with two blade observation windows on both sides, and the length of the blade observation window in the direction of water flow is greater than the length of the blade in the direction of water flow at various angles. An observation window is provided in the impeller chamber for real-time observation of the cavitation morphology of the blades. The observation window is made of plexiglass, which has sufficient rigidity and a smooth inner wall. Its length in the direction of the water flow is greater than the length of the blade in the direction of the water flow at various angles, ensuring that the flow pattern can be observed completely at different blade angles. The plexiglass observation window and the impeller chamber are processed in the same process to ensure uniform gap. If the plexiglass becomes blurry after processing, it can be restored to a transparent state by heating.

[0008] The adjustment mechanism includes an adjustment disc rotatably mounted within an adjustment groove on the impeller. The impeller blade shaft engages with the adjustment disc. By adjusting the rotation of the blade shaft and the adjustment disc, the adjustment mechanism allows for angle adjustment of the blades on the hub. The impeller blades employ an adjustable structure, with graduation marks engraved on both the hub and the blades, facilitating quick and precise on-site blade angle adjustment to meet the needs of different test conditions. Angle adjustment can be completed without disassembly.

[0009] Preferably, the impeller diameter is 0.32m, and the hub and blades are respectively provided with scales.

[0010] The impeller diameter was set to 0.32m to meet the flow simulation requirements of the model test and ensure the correlation between the test data and the actual working conditions.

[0011] Preferably, the clearance between the blade and the impeller chamber is controlled to be 0.15~0.2mm; this balances operational stability and sealing performance, reducing efficiency loss caused by clearance leakage. The hub and main shaft are connected by a straight shaft and torque is transmitted via a key, adapting to both forward and reverse operating conditions. The straight shaft connection and keyed torque transmission ensure stable adaptation to both forward and reverse test conditions, guaranteeing the reliability and symmetry of torque transmission.

[0012] Preferably, adjusting nuts and anti-loosening washers are provided before and after the rear bearing of the main shaft to adjust the main shaft axis to ensure clearance. Adjusting nuts are provided on both sides of the rear bearing. By adjusting the position of the main shaft axis, the fitting clearance of 0.15~0.2mm between the impeller chamber and the impeller is accurately ensured. Anti-loosening washers are provided with the adjusting nuts to prevent clearance deviation caused by vibration during the test, thereby improving structural stability.

[0013] Preferably, the blades are made of copper, while the remaining flow-through components are made of stainless steel. The blade roughness is 0.8 μm, and the roughness of the inlet cone and outlet bend is 3.2 μm. Different materials are selected for the flow-through components according to performance requirements. The blades are made of copper to ensure wear resistance and hydraulic characteristics; the hub, guide vane, impeller chamber, and inlet / outlet pipes are made of stainless steel to balance rigidity, corrosion resistance, and machinability. The surface roughness of the blades is controlled at 0.8 μm, and the inner surface roughness of the inlet and outlet bends is controlled at 3.2 μm to reduce hydraulic loss.

[0014] Preferably, the inlet cone and outlet bend are precision cast with a pre-drilled grinding allowance. The inner cylinder and guide vane are integrally engraved by a five-axis CNC machine tool. The outer cylinder is welded to the guide vane in half, and the unwelded areas are filled with glue. The blades and hub are machined by five-axis CNC without reversing. After the blades and hub are assembled, the outer circle of the blades is machined as a whole.

[0015] Preferably, the anti-loosening washer is a spring anti-loosening washer, which achieves anti-loosening through mechanical compression.

[0016] Preferably, the blade angle scale accuracy is ±0.1°, and the circumferential error of the gap between the blade and the impeller chamber is ≤0.03mm.

[0017] Preferably, the inlet cone is detachably connected to the first flange via a first nut, a first bolt, and a first rubber strip; the impeller chamber is detachably connected to the inlet cone and the guide vane via a second bolt, a washer, a sleeve, a second rubber strip, and a pin.

[0018] Preferably, the water outlet bend and the support ring are detachably connected by fasteners, and the gap between the outer ring of the main shaft rear bearing and the first pressure cover is 0.01~0.03mm.

[0019] (III) Beneficial Effects Compared with the prior art, the present invention provides a high-efficiency guide vane type mixed flow pump section model test device, which has the following beneficial effects: 1. This high-efficiency guide vane mixed-flow pump section model test device, through comprehensive optimization of structural design, processing technology, and component configuration, achieves significant improvements in disassembly and maintenance, test observation accuracy, operating condition adaptability, test data reliability, device operation stability, and hydraulic efficiency, while ensuring a high degree of similarity between test data and actual operating conditions. Disassembly and maintenance convenience is greatly improved: the impeller chamber adopts a split-half structure, equipped with lifting lugs and tapered pins with small-end threaded connections, enabling rapid positioning and disassembly; the components of the segmented pump section can be detachably connected, reducing maintenance and repair time and difficulty, and adapting to the need for multiple component replacements.

[0020] 2. This high-efficiency guide vane mixed flow pump section model test device provides comprehensive and accurate flow observation: the plexiglass observation window is processed in the same process as the impeller chamber, with uniform gaps, and is adapted to the angle of each blade along the length of the water flow to ensure a complete observation range; if blurred, it can be restored to transparency by heating with fire, continuously ensuring the real-time observation effect of the blade cavitation morphology and flow state, providing reliable visual basis for experimental analysis.

[0021] 3. This high-efficiency guide vane mixed-flow pump section model test device features strong adaptability to operating conditions and precise and efficient adjustment: the adjustable blade structure, combined with a ±0.1° precision scale, allows for rapid adjustment of the blade angle to adapt to different test conditions; the 0.32m diameter impeller precisely matches the flow simulation requirements, ensuring consistency between test and actual operating conditions; the blade-impeller chamber clearance is precisely controlled within 0.15~0.2mm, with a circumferential error ≤0.03mm, and combined with differentiated roughness design, it reduces gap leakage and hydraulic loss, ensuring the correlation between test data and actual operating conditions; the connection structure between the main shaft and the hub adapts to both forward and reverse rotation operating conditions, ensuring stable torque transmission and further improving data reliability.

[0022] 4. This high-efficiency guide vane mixed-flow pump section model test device exhibits excellent operational stability: the spring anti-loosening gasket and adjusting nut work together to effectively prevent clearance deviation caused by vibration; the precisely controlled bearing clearance, high-strength connection structure, and differentiated material configuration take into account the requirements of wear resistance, corrosion resistance, and rigidity, extending the service life of the device and ensuring stable operation during the test; hydraulic performance optimization: integrated engraving, integral machining of the outer circle, and other optimized processes, combined with a smooth flow surface design, significantly reduce hydraulic losses and improve the device's test efficiency and the accuracy of hydraulic performance simulation. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0024] Figure 2 for Figure 1 Sectional view at point AA.

[0025] Figure 3 This is a schematic diagram of the blade adjustment mechanism of the present invention.

[0026] Figure 4 for Figure 1 Enlarged view of point A in the middle.

[0027] Figure 5 This is a reference diagram for measuring the coaxiality of the pump section in this invention.

[0028] Figure 6 This is a physical diagram of the overall structure of the present invention.

[0029] Figure 7 This is a physical diagram of the blade hub structure of the present invention.

[0030] In the picture: 1. First nut; 2. First bolt; 3. First flange; 4. First rubber strip; 5. Inlet cone; 6. Second bolt; 7. Washer; 8. Sleeve; 9. Impeller chamber; 901. Observation window; 10. Second rubber strip; 11. Pin; 12. Guide vane body; 13. Outlet elbow; 14. Packing; 15. Third rubber strip; 16. Pressure cover; 17. Third bolt; 18. Second nut; 19. Third nut; 20. Fourth bolt; 21. Support ring; 22. Fifth bolt; 23. First pressure cover; 2 4. Coupling flange; 25. Main shaft; 26. First key body; 27. Fourth nut; 28. Retaining sleeve; 29. ​​Felt ring; 30. Second key body; 31. First rolling bearing; 32. Support ring; 33. Locking washer; 34. Second rolling bearing; 35. Screw; 36. Second gland; 37. Third key body; 38. Impeller; 381. Blade shaft; 39. Third gland; 40. Steel plate; 41. Fifth bolt; 42. Circular plate; 43. Pin; 44. Hub; 441. Adjusting groove; 45. Adjusting disc. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0033] In addition, a fixed connection refers to a connection in which parts or components are fixed and there is no relative movement; a transmission connection refers to a connection in which mechanical motion or torque is transmitted to other working parts through a transmission component; a sliding connection refers to a connection in which two objects are in contact but not fixed and can slide relative to each other; and a rotational connection refers to a connection in which two objects are in contact but not fixed and can rotate relative to each other.

[0034] Furthermore, the terms "first" and "second" are used 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 as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] This embodiment provides a high-efficiency guide vane type mixed flow pump section model test device, which has the following technical features.

[0036] Please see Figures 1 to 7 , A high-efficiency guide vane type mixed flow pump section model test device includes a segmented pump section group and an adjustment mechanism. The segmented pump section group includes a detachably connected inlet cone pipe 5, guide vane body 12, impeller chamber 9, outlet bend pipe 13 and support ring 21. Impeller chamber 9 adopts a split structure, and the split surface connecting parts adopt a tapered pin and threaded structure for detachable connection; impeller chamber 9 adopts a half-split structure, and its outer wall is equipped with lifting lugs for easy hoisting and disassembly; the split surface pin adopts a tapered pin and small-end thread structure to achieve quick positioning and disassembly, reducing the difficulty of maintenance and repair of the test device.

[0037] Two blade observation windows 901 are symmetrically arranged on both sides of the impeller chamber 9. The length of the blade observation window 901 in the direction of water flow is greater than the length of the blade in the direction of water flow at various angles. The impeller chamber has two observation windows 901 for real-time observation of the cavitation morphology of the blades. The observation windows 901 are made of plexiglass, which has sufficient rigidity and a smooth inner wall. Its length in the direction of the water flow is greater than the length of the blade in the direction of the water flow at various angles, ensuring that the flow state can be completely observed at different blade angles. The plexiglass observation windows 901 and the impeller chamber 9 are processed in the same process to ensure uniform gap. If the plexiglass becomes blurry after processing, it can be restored to a transparent state by heating.

[0038] The adjustment mechanism includes an adjustment disk 45 rotatably mounted within an adjustment groove 441 of the impeller 38. The blade shaft 381 of the impeller 38 engages with the adjustment disk 45. By rotating the adjustment disk 45, the adjustment mechanism drives the blade shaft 381 to rotate, thereby adjusting the angle of the blades on the hub 44. The impeller 38 blades adopt an adjustable structure, with scale markings engraved on both the hub 44 and the blades, facilitating quick and precise on-site adjustment of the blade angle to meet the needs of different test conditions. Angle adjustment can be completed without disassembly.

[0039] The impeller 38 has a diameter of 0.32m, and the hub 44 and blades are respectively marked with scales.

[0040] The impeller diameter was set to 0.32m to meet the flow simulation requirements of the model test and ensure the correlation between the test data and the actual working conditions.

[0041] The clearance between the blades and impeller chamber 9 is controlled at 0.15~0.2mm; this balances operational stability and sealing performance, reducing efficiency loss caused by clearance leakage. The hub 44 and main shaft 25 are connected by a straight shaft and transmit torque via a key, adapting to both forward and reverse rotation operating conditions. This direct shaft connection and keyed torque transmission ensures stable compatibility with both forward and reverse rotation test conditions, guaranteeing the reliability and symmetry of torque transmission.

[0042] Adjusting nuts and anti-loosening washers are installed before and after the rear bearing of the main shaft 25 to adjust the axis of the main shaft 25 to ensure clearance. Adjusting nuts are installed on both sides of the rear bearing. By adjusting the position of the axis of the main shaft 25, the fitting clearance of 0.15~0.2mm between the impeller chamber 9 and the impeller 38 is precisely ensured. Anti-loosening washers are installed with the adjusting nuts to prevent clearance displacement caused by vibration during the test, thereby improving structural stability.

[0043] The blades are made of copper, while the remaining flow-through components are made of stainless steel. The blade roughness is 0.8 μm, and the roughness of the inlet cone 5 and the outlet bend 13 is 3.2 μm. Different materials are selected for the flow-through components according to performance requirements. The blades are made of copper to ensure wear resistance and hydraulic characteristics; the hub 44, guide vane 12, impeller chamber 9, and inlet and outlet bends 13 are made of stainless steel to balance rigidity, corrosion resistance, and machinability. The surface roughness of the blades is controlled at 0.8 μm, and the inner surface roughness of the inlet cone 5 and the outlet bend 13 is controlled at 3.2 μm to reduce hydraulic losses.

[0044] The inlet cone pipe 5 and the outlet bend pipe 13 are precision cast and have a grinding allowance. The inner cylinder of the guide vane body 12 and the guide vane are engraved in one piece by a five-axis CNC machine tool. The outer cylinder is welded to the guide vane in half and the unwelded area is filled with glue. The blade and hub 44 are machined by five-axis CNC without turning around. After the blade and hub 44 are assembled, the outer circle of the blade is machined as a whole.

[0045] The anti-loosening washer is a spring-loaded anti-loosening washer, which achieves anti-loosening through mechanical compression.

[0046] The blade angle scale accuracy is ±0.1°, and the circumferential error of the gap between the blade and impeller chamber 9 is ≤0.03mm.

[0047] The inlet cone pipe 5 is detachably connected to the first flange 3 via the first nut 1, the first bolt 2, and the first rubber strip 4; the impeller chamber 9 is detachably connected to the inlet cone pipe 5 and the guide vane body 12 via the second bolt 6, the washer 7, the sleeve 8, the second rubber strip 10, and the pin 11.

[0048] The water outlet bend 13 and the support ring 21 are detachably connected by fasteners, and the gap between the outer ring of the rear bearing of the main shaft 25 and the first pressure cover 23 is 0.01~0.03mm.

[0049] Improving the efficiency of the model device places certain requirements on the processing: 1. The inlet cone pipe 5 and the outlet bend pipe 13 are precision cast, with only grinding allowance left on the inner surface to meet the drawing size requirements, and the roughness reaches 3.2μm. The interface between adjacent parts is machined, abandoning the traditional segmented machining structure, which enhances the rigidity of the parts and avoids the risk of water leakage from the segmented surface.

[0050] 2. The inner cylinder and guide vane of the guide vane are engraved on a five-axis CNC machine tool. The outer cylinder adopts a split structure and is welded to the guide vane as a whole. Due to space constraints, the guide vane and outer cylinder are sealed with the maximum possible welding. The unwelded parts are filled with glue to make the flow surface smooth and reduce hydraulic loss.

[0051] 3. For the machining of blades and hub 44, considering the requirements of materials, machining accuracy, and roughness of 0.8μm, both parts are machined using five-axis CNC and cannot be turned around.

[0052] 4. Impeller chamber 9 is machined to facilitate angle adjustment and observation of the flow pattern in the blade area. It features a segmented structure and two transparent acrylic glass viewing windows 901. To ensure uniformity of the gaps, the acrylic glass viewing windows are machined in the same way as the impeller chamber. After machining, the acrylic glass may appear blurry; however, this can be restored to its transparent state by heating it with fire.

[0053] 5. The outer circle of the blade is fixedly machined after the blade and hub 44 are assembled, which can better ensure the uniformity of the gap between the blade and the impeller chamber.

[0054] In summary, this high-efficiency guide vane mixed-flow pump section model test device has achieved significant improvements in many aspects, such as disassembly and maintenance, test observation accuracy, working condition adaptability, test data reliability, device operation stability and hydraulic efficiency, through comprehensive optimization of structural design, processing technology and component configuration. At the same time, it ensures a high degree of similarity between the test data and the actual working conditions.

[0055] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0056] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A model test device for a high-efficiency guide vane type mixed flow pump section, characterized in that: It includes a segmented pump section assembly and an adjustment mechanism. The segmented pump section assembly includes a detachably connected inlet cone pipe (5), guide vane body (12), impeller chamber (9), outlet bend pipe (13), and support ring (21). The impeller chamber (9) adopts a segmented structure, and the segmented surface connecting parts adopt a tapered pin and threaded structure for detachable connection; The impeller chamber (9) is symmetrically provided with two blade observation windows (901) on both sides. The length of the blade observation window (901) in the direction of water flow is greater than the length of the blade in the direction of water flow at each angle. The adjustment mechanism includes an adjustment disk (45) rotatably disposed in the adjustment groove (441) of the impeller (38). The blade shaft (381) of the impeller (38) cooperates with the adjustment disk (45). The adjustment mechanism drives the blade shaft (381) to rotate by adjusting the adjustment disk (45), so that the blade can be adjusted in angle on the hub (44).

2. The high-efficiency guide vane type mixed flow pump section model test device according to claim 1, characterized in that: The impeller (38) has a diameter of 0.32m, and the hub (44) and blades are respectively provided with scales.

3. The high-efficiency guide vane type mixed flow pump section model test device according to claim 2, characterized in that: The clearance between the blade and the impeller chamber (9) is controlled to be 0.15~0.2mm; the hub (44) and the main shaft (25) are connected by a straight shaft and the torque is transmitted through a key, which is suitable for both forward and reverse operation.

4. The high-efficiency guide vane type mixed flow pump section model test device according to claim 3, characterized in that: Adjusting nuts and anti-loosening washers are provided at the front and rear of the rear bearing of the main shaft (25) to adjust the axis of the main shaft (25) to ensure clearance.

5. The high-efficiency guide vane type mixed flow pump section model test device according to claim 4, characterized in that: The blades are made of copper, and the other flow-through components are made of stainless steel. The blade roughness is 0.8μm, and the roughness of the inlet cone (5) and outlet bend (13) is 3.2μm.

6. The high-efficiency guide vane type mixed flow pump section model test device according to claim 5, characterized in that: The inlet cone (5) and outlet bend (13) are precision cast and have a grinding allowance. The inner cylinder of the guide vane body (12) and the guide vane are engraved in one piece by a five-axis CNC machine tool. The outer cylinder is welded to the guide vane in half and the unwelded area is filled with glue. The blade and hub (44) are machined by five-axis CNC without turning around. After the blade and hub (44) are assembled, the outer circle of the blade is machined as a whole.

7. The high-efficiency guide vane type mixed flow pump section model test device according to claim 6, characterized in that: The anti-loosening washer is a spring anti-loosening washer, which achieves anti-loosening through mechanical compression.

8. The high-efficiency guide vane type mixed flow pump section model test device according to claim 7, characterized in that: The blade angle scale accuracy is ±0.1°, and the circumferential error of the gap between the blade and the impeller chamber (9) is ≤0.03mm.

9. The high-efficiency guide vane type mixed flow pump section model test device according to claim 8, characterized in that: The inlet cone (5) is detachably connected to the first flange (3) via the first nut (1), the first bolt (2), the first rubber strip (4); the impeller chamber (9) is detachably connected to the inlet cone (5) and the guide vane body (12) via the second bolt (6), the washer (7), the sleeve (8), the second rubber strip (10), and the pin (11).

10. The high-efficiency guide vane type mixed flow pump section model test device according to claim 9, characterized in that: The water outlet bend (13) and the support ring (21) are detachably connected by fasteners, and the gap between the outer ring of the rear bearing of the main shaft (25) and the first pressure cover (23) is 0.01~0.03mm.

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