A front guide vane propeller pump performance measuring test device

Abstract

This invention discloses a performance measurement test device for a front-guide vane propulsion pump, relating to the field of fluid machinery technology. It includes a test pump section, a rotary drive component, a circulation pipeline, a first pressure measuring component, a second pressure measuring component, and a torque sensor. An impeller chamber, a hollow connector, and an outlet bend are connected sequentially. The rear end of the pump shaft extends through the outlet bend to the outside and is connected to the rotary drive component via the torque sensor. The front end of the pump shaft is fitted with several adjusting shims, an impeller, and several more adjusting shims sequentially from front to back. The front guide vane is located at the front end of the impeller chamber. One end of the circulation pipeline is connected to the impeller chamber, and the other end is connected to the outlet bend. The first pressure measuring component is located at the inlet of the impeller chamber, and the second pressure measuring component is located at the outlet of the outlet bend. This device can flexibly adjust the dynamic and static distance between the front guide vane and the impeller, making it suitable for experimental research on different models of front-guide vane propulsion pumps.

Description

Technical Field

[0001] This invention relates to the field of fluid machinery technology, and in particular to a test device for measuring the performance of a front-guided vane propulsion pump. Background Technology

[0002] The front-guide vane propulsion pump is a widely used axial-flow pump for underwater vehicle propulsion. Its guide vanes are installed before the impeller. Water flowing past the guide vanes generates a circumferential velocity opposite to the impeller's rotation direction, known as negative pre-swirl. This negative pre-swirl is canceled out at the outlet by the impeller's rotation, allowing the water to be ejected directly. The negative pre-swirl induced by the guide vanes reduces pressure pulsation between the guide vanes and the impeller, and optimizes the impeller's inflow conditions by changing the angle of attack. Compared to traditional rear-guide vane axial-flow pumps, the front-guide vane propulsion pump produces less pressure pulsation and lower noise, making it the preferred propulsion device for underwater vehicles.

[0003] Before a propulsion pump is installed on its carrier, extensive testing is typically required to optimize and validate the hydraulic performance of the model pump. Currently, axial flow pump performance testing equipment is mostly concentrated on traditional rear-guide vane axial flow pump test benches, where the positions of the impeller and guide vanes are fixed, and the assembly and disassembly process is complex. There is no suitable test device for measuring the performance of front-guide vane propulsion pumps. Furthermore, the dynamic and static distance between the front guide vane and the impeller is a key parameter affecting the hydraulic performance and excitation force level of the propulsion pump, and currently, there is no simple test device that can measure the impact of dynamic and static distance on the performance of front-guide vane propulsion pumps. Summary of the Invention

[0004] To address the above technical problems, this invention provides a performance measurement and testing device for a front guide vane propulsion pump, which can flexibly adjust the dynamic and static distance between the front guide vane and the impeller, and is suitable for experimental research on different models of front guide vane propulsion pumps.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] This invention provides a performance measurement and testing device for a front-guide vane propulsion pump, comprising a test pump section, a rotary drive component, a circulation pipeline, a first pressure measuring component, a second pressure measuring component, and a torque sensor. The test pump section includes an impeller chamber, a hollow connector, an outlet bend, a support frame, a pump shaft, an impeller, a front guide vane, a locking component, and multiple adjusting shims. The impeller chamber, the hollow connector, and the outlet bend are connected sequentially. The support frame is disposed inside the hollow connector. The pump shaft is rotatably fitted within the support frame. The rear end of the pump shaft extends to the outside through the outlet bend and is connected to the rotary drive component via the torque sensor. From front to back, the front end of the pump shaft is sequentially fitted with multiple adjusting shims, the impeller, and multiple adjusting shims. The adjusting shim at the rear end is axially limited by the limiting shoulder of the pump shaft, and the adjusting shim at the front end is axially limited by the locking component installed on the pump shaft. The impeller and the adjusting shim are both circumferentially limited relative to the pump shaft. The front guide vane is disposed at the front end of the impeller chamber and is circumferentially limited relative to the impeller chamber. One end of the circulation pipe is connected to the impeller chamber, and the other end of the circulation pipe is connected to the outlet bend. The front end and rear end of the front guide vane are axially limited by one end of the circulation pipe and the step of the impeller chamber, respectively. The first pressure measuring component is disposed at the inlet of the impeller chamber, and the second pressure measuring component is disposed at the outlet of the outlet bend.

[0007] Preferably, the pump shaft includes a first shaft segment, a second shaft segment, and a third shaft segment arranged sequentially from front to back. The locking component is disposed on the first shaft segment. A flat key is disposed on the second shaft segment. Keyways matching the flat key structure are disposed on the inner walls of the impeller and the adjusting shim. The limiting shoulder is formed between the second shaft segment and the third shaft segment. The third shaft segment is rotatably sleeved in the support frame. The rear end of the third shaft segment extends to the outside through the outlet bend and is connected to the rotary drive component through the torque sensor.

[0008] Preferably, the first shaft segment is provided with external threads, and the locking component includes a plurality of locking nuts, which are installed on the first shaft segment and can abut against the adjusting shim at the foremost end.

[0009] Preferably, the support frame includes a support hub and multiple connecting rods. One end of each connecting rod is fixed to the inner wall of the hollow connector, and the other end of each connecting rod is fixed to the outer wall of the support hub. The pump shaft is disposed in the support hub. The test pump section further includes a first skeleton oil seal, a second skeleton oil seal, and a bearing. The first skeleton oil seal, the bearing, and the second skeleton oil seal are disposed sequentially from front to back in the support hub and sleeved on the pump shaft.

[0010] Preferably, the front guide vane includes a guide hub, a rim fixing shell, and multiple blades. The outer end of each blade is fixed to the inner wall of the rim fixing shell, and the inner end of each blade is fixed to the inner wall of the guide hub. The rim fixing shell is disposed at the front end of the impeller chamber. The front and rear ends of the rim fixing shell are axially limited by one end of the circulation pipeline and the step of the impeller chamber, respectively. The test pump section also includes a positioning pin. A first positioning half-hole is provided on the outer wall of the rim fixing shell, and the first positioning half-hole penetrates the front end of the rim fixing shell. A second positioning half-hole is provided on the inner wall of the impeller chamber, and the second positioning half-hole penetrates the front end of the impeller chamber. The first positioning half-hole and the second positioning half-hole are joined to form a positioning hole, and the positioning pin is disposed in the positioning hole.

[0011] Preferably, the system further includes a booster pump, a flow meter, a first regulating ball valve, a first pressure stabilizing tank, a second pressure stabilizing tank, and a second regulating ball valve. The first regulating ball valve, the first pressure stabilizing tank, the flow meter, the booster pump, the second pressure stabilizing tank, and the second regulating ball valve are sequentially arranged on the circulation pipeline from the end connected to the outlet bend to the end connected to the impeller chamber.

[0012] Preferably, the thickness of each adjusting shim is 0.025D ​​to 0.1D, where D is the outer diameter of the impeller; the adjustable range of the dynamic and static distance between the front guide vane and the impeller is 0.1D to 0.4D.

[0013] Preferably, the hollow connector is a connecting flange, the front end of which is connected to the impeller chamber by multiple bolts and multiple nuts, and the rear end of which is connected to the outlet bend by multiple bolts and multiple nuts.

[0014] The present invention achieves the following technical effects compared to the prior art:

[0015] This invention relates to a performance measurement and testing device for a front-guide vane propulsion pump. The front guide vane is installed before the impeller, and the support frame is installed after the impeller. The front guide vane, impeller, and support frame are all assembled with the pump shaft. The rear end of the pump shaft is connected to a rotary drive component via a torque sensor. The front guide vane is fitted into the impeller chamber, and its axial and circumferential directions remain fixed. The dynamic and static distance between the impeller and the front guide vane can be adjusted by installing adjusting shims to move the axial position of the impeller. Both ends of the circulation pipeline are connected to the impeller chamber and the outlet bend, respectively. A first pressure measuring component is located at the inlet of the impeller chamber, and a second pressure measuring component is located at the outlet of the outlet bend. The head of the front-guide vane propulsion pump can be measured using the first and second pressure measuring components, and the impeller torque can be measured using the torque sensor. Therefore, the head and efficiency performance of the front-guide vane propulsion pump can be calculated. This invention can perform performance measurement tests on different models of front-guide vane propulsion pumps under different dynamic and static distances. It has a simple structure, is easy to assemble and disassemble, and has promising application prospects. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments 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.

[0017] Figure 1 A schematic diagram of the performance measurement and testing device for the front guide vane propulsion pump provided by the present invention;

[0018] Figure 2 This is a schematic diagram of the overall structure of the test pump section in the front guide vane propulsion pump performance measurement and testing device provided by the present invention.

[0019] Figure 3 This is a partial structural diagram of the test pump section in the performance measurement and testing device for the front guide vane propulsion pump provided by the present invention;

[0020] Figure 4 A schematic diagram of the adjusting shim in the performance measurement and testing device for the front guide vane propulsion pump provided by the present invention;

[0021] Figure 5 for Figure 4 Sectional view along the middle AA direction;

[0022] Figure 6 A schematic diagram of the structure of the front guide vane in the front guide vane propulsion pump performance measurement and testing device provided by the present invention;

[0023] Figure 7 A schematic diagram of the positioning pin in the performance measurement and testing device for the front guide vane propulsion pump provided by the present invention.

[0024] Explanation of reference numerals in the attached drawings: 100. Performance measurement and testing device for a front-guided vane propulsion pump; 1. Impeller chamber; 2. Hollow connecting piece; 3. Outlet bend; 4. Support frame; 41. Support hub; 42. Connecting rod; 5. Pump shaft; 51. First shaft section; 52. Second shaft section; 53. Third shaft section; 6. Impeller; 61. Impeller hub; 62. Impeller blade; 7. Front guide vane; 71. Guide hub; 72. Rim fixing shell; 73. Blade; 8. Adjusting shim; 9. Locking nut; 10. Positioning pin; 11. Flat key; 12. Keyway; 13. First skeleton oil seal; 14. Bearing; 15. Second skeleton oil seal; 16. Rotary drive component; 17. Circulation pipeline; 18. First regulating ball valve; 19. First pressure stabilizing tank; 20. Flow meter; 21. Booster pump; 22. Second pressure stabilizing tank; 23. Second regulating ball valve. Detailed Implementation

[0025] 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.

[0026] The purpose of this invention is to provide a performance measurement and testing device for a front guide vane propulsion pump, which can flexibly adjust the dynamic and static distance between the front guide vane and the impeller, and is suitable for the test research of different models of front guide vane propulsion pumps.

[0027] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figures 1-7As shown, this embodiment provides a performance measurement test device 100 for a front-guide vane propulsion pump, including a test pump section, a rotary drive component 16, a circulation pipeline 17, a first pressure measuring component, a second pressure measuring component, and a torque sensor. The test pump section includes an impeller chamber 1, a hollow connector 2, an outlet bend 3, a support frame 4, a pump shaft 5, an impeller 6, a front guide vane 7, a locking component, and multiple adjusting shims 8. The impeller chamber 1, the hollow connector 2, and the outlet bend 3 are connected sequentially. The support frame 4 is disposed inside the hollow connector 2, and the pump shaft 5 is rotatably sleeved in the support frame 4. The frame 4 is used to support the pump shaft 5. The rear end of the pump shaft 5 extends to the outside through the outlet bend 3 and is connected to the rotary drive component 16 through a torque sensor. The front end of the pump shaft 5 is fitted with several adjusting shims 8, an impeller 6 and several adjusting shims 8 in sequence from front to back. The rearmost adjusting shim 8 is axially limited by the limiting shoulder of the pump shaft 5, and the frontmost adjusting shim 8 is axially limited by the locking component installed on the pump shaft 5. The impeller 6 and the adjusting shims 8 are both circumferentially limited relative to the pump shaft 5, that is, the pump shaft 5 can drive the impeller 6 and the adjusting shims 8 to rotate. The front guide vane 7 is located at the front end inside the impeller chamber 1. The front guide vane 7 is circumferentially limited relative to the impeller chamber 1. One end of the circulation pipe 17 is connected to the impeller chamber 1, and the other end of the circulation pipe 17 is connected to the outlet bend 3. The front end and rear end of the front guide vane 7 are axially limited by one end of the circulation pipe 17 and the step of the impeller chamber 1, respectively. Specifically, the front end of the front guide vane 7 is axially limited by the pipe flange connected to the inlet end of the impeller chamber 1, so as to achieve relative fixation between the front guide vane 7 and the impeller chamber 1 after installation. The first pressure measuring component is located at the inlet of the impeller chamber 1, and the second pressure measuring component is located at the outlet of the outlet bend 3.

[0029] In this embodiment, the front guide vane 7 is installed before the impeller 6, and the support frame 4 is installed after the impeller 6. The front guide vane 7, impeller 6, and support frame 4 are all assembled with the pump shaft 5. The rear end of the pump shaft 5 is connected to the rotary drive component 16 through a torque sensor. The torque sensor can measure the torque and then calculate the shaft power of the front guide vane propulsion pump. The front guide vane 7 is installed in conjunction with the impeller chamber 1, and its axial and circumferential directions are fixed. The dynamic and static distance between the impeller 6 and the front guide vane 7 can be adjusted by installing adjusting shims 8 to move the axial position of the impeller 6. The two ends of the circulation pipeline 17 are connected to the impeller chamber 1 and the outlet bend 3, respectively. The first pressure measuring component is set at the inlet of the impeller chamber 1, and the second pressure measuring component is set at the outlet of the outlet bend 3. The pressure difference between the inlet and outlet of the front guide vane propulsion pump can be measured, and then its head can be calculated. In this embodiment, the dynamic and static distance between the impeller 6 and the front guide vane 7 can be flexibly adjusted, which facilitates testing the influence of the dynamic and static distance on the hydraulic performance of the front guide vane propulsion pump. It can meet the hydraulic performance testing of front guide vane propulsion pumps with different impeller 6 and front guide vane 7 schemes. That is, this embodiment can conduct performance measurement tests on different models of front guide vane propulsion pumps under different dynamic and static distances. Its structure is simple, easy to assemble and disassemble, and has certain application prospects.

[0030] like Figure 3 As shown, the pump shaft 5 includes a first shaft section 51, a second shaft section 52, and a third shaft section 53 arranged sequentially from front to back. A locking component is provided on the first shaft section 51. A flat key 11 is provided on the second shaft section 52. The flat key 11 extends along the axial direction of the second shaft section 52, and the length of the flat key 11 is equal to the length of the second shaft section 52. The inner walls of the impeller 6 and the adjusting shim 8 are provided with keyways 12 that match the structure of the flat key 11. A limiting shoulder is formed between the second shaft section 52 and the third shaft section 53. The outer diameter of the second shaft section 52 is smaller than the outer diameter of the third shaft section 53. The third shaft section 53 is rotatably sleeved in the support frame 4. The rear end of the third shaft section 53 extends to the outside through the outlet bend 3 and is connected to the rotary drive component 16 through a torque sensor.

[0031] In this embodiment, the impeller 6 includes an impeller hub 61 and a plurality of impeller blades 62 disposed on the impeller hub 61. The inner wall of the impeller hub 61 is provided with a keyway 12 that matches the structure of the flat key 11. The angle of the impeller blades 62 is not adjustable. The impeller blades 62 and the impeller hub 61 are an integral structure.

[0032] The first shaft section 51 is provided with external threads, and the locking component includes several locking nuts 9. The locking nuts 9 are installed on the first shaft section 51 and can abut against the adjusting shim 8 at the front end. The locking nuts 9 cooperate with the limiting shoulder on the pump shaft 5 to axially limit the impeller 6 and the adjusting shim 8 installed on the second shaft section 52.

[0033] Specifically, the support frame 4 includes a support hub 41 and multiple connecting rods 42. One end of each connecting rod 42 is fixed to the inner wall of the hollow connector 2, and the other end of each connecting rod 42 is fixed to the outer wall of the support hub 41. The pump shaft 5 is disposed in the support hub 41. The test pump section also includes a first skeleton oil seal 13, a second skeleton oil seal 15, and a bearing 14. The first skeleton oil seal 13, the bearing 14, and the second skeleton oil seal 15 are sequentially disposed in the support hub 41 from front to back and sleeved on the pump shaft 5. Specifically, the first skeleton oil seal 13, the bearing 14, and the second skeleton oil seal 15 are all sleeved on the third shaft section 53. The first skeleton oil seal 13 and the second skeleton oil seal 15 are used to seal the bearing 14, which supports the pump shaft 5 and ensures its normal rotation. In this embodiment, the bearing 14 is a deep groove ball bearing.

[0034] like Figure 6 As shown, the front guide vane 7 includes a guide hub 71, a rim fixing shell 72, and multiple blades 73. The outer ends of each blade 73 are fixed to the inner wall of the rim fixing shell 72, and the inner ends of each blade 73 are fixed to the inner wall of the guide hub 71. The rim fixing shell 72 is located at the front end inside the impeller chamber 1. The front and rear ends of the rim fixing shell 72 are axially limited by one end of the circulation pipe 17 and the step of the impeller chamber 1, respectively. The test pump section also includes a positioning pin 10. A first positioning half-hole is provided on the outer wall of the rim fixing shell 72, and the first positioning half-hole penetrates the front end of the rim fixing shell 72. A second positioning half-hole is provided on the inner wall of the impeller chamber 1, and the second positioning half-hole penetrates the front end of the impeller chamber 1. The first positioning half-hole and the second positioning half-hole are joined to form a positioning hole. The positioning pin 10 is set in the positioning hole, thereby limiting the circumferential movement of the front guide vane 7.

[0035] In this embodiment, there are two positioning holes and two positioning pins 10, and the two positioning pins 10 are 180° apart circumferentially. In this embodiment, the positioning pins 10 are square positioning pins and the positioning holes are square positioning holes.

[0036] This embodiment also includes a booster pump 21, a flow meter 20, a first regulating ball valve 18, a first pressure stabilizing tank 19, a second pressure stabilizing tank 22, and a second regulating ball valve 23. The circulation pipeline 17 is sequentially equipped with the first regulating ball valve 18, the first pressure stabilizing tank 19, the flow meter 20, the booster pump 21, the second pressure stabilizing tank 22, and the second regulating ball valve 23 from the end connected to the outlet bend 3 to the end connected to the impeller chamber 1. The first regulating ball valve 18 and the second regulating ball valve 23 regulate the flow rate in the pipeline. The first pressure stabilizing tank 19 and the second pressure stabilizing tank 22 buffer the incoming flow in the pipeline, providing stable inflow conditions for the test pump section inlet. The flow meter 20 measures the flow rate through the pipeline, and the booster pump 21 provides energy to the water flow, ensuring normal circulation of water in the pipeline under high flow conditions in the test pump section.

[0037] Specifically, the thickness of each adjusting shim 8 is 0.025D ​​to 0.1D, where D is the outer diameter of the impeller 6; the adjustable range of the dynamic and static distance between the front guide vane 7 and the impeller 6 is 0.1D to 0.4D.

[0038] In this specific embodiment, the thickness of each adjusting shim 8 is 0.05D. The inner and outer diameters of the adjusting shims 8 are the same as the inner and outer diameters of the impeller hub 61, respectively. The outer diameter of the impeller 6 is D = 200mm. Four adjusting shims 8 are installed at the front end of the impeller 6, and two adjusting shims 8 are installed at the rear end of the impeller 6. There is a gap between the rearmost adjusting shim 8 and the support hub 41 of the support frame 4, and there is a gap between the frontmost adjusting shim 8 and the guide hub 71 of the front guide vane 7.

[0039] In this specific embodiment, the hollow connector 2 is a connecting flange. The front end of the connecting flange is connected to the impeller chamber 1 by multiple bolts and multiple nuts, and the rear end of the connecting flange is connected to the outlet bend 3 by multiple bolts and multiple nuts.

[0040] In this embodiment, the rotary drive component 16 is an electric motor. The torque sensor is horizontally installed between the pump shaft 5 and the electric motor, and they are connected to each other through a coupling to ensure coaxiality during installation.

[0041] In this embodiment, a first pressure measuring pipe connects the pressure measuring hole at the inlet of the circulation pipeline 17 to the first pressure measuring component, and a second pressure measuring pipe connects the pressure measuring hole at the outlet of the circulation pipeline 17 to the second pressure measuring component. Both the inlet and outlet pressure measuring holes are located at the horizontal centerline of the circulation pipeline 17. The first pressure measuring component is flush with the inlet pressure measuring hole, meaning they are on the same horizontal plane; similarly, the second pressure measuring component is flush with the outlet pressure measuring hole, meaning they are on the same horizontal plane. The inlet pressure measuring hole is 0.2D from the inlet end of the impeller chamber 1, and the outlet pressure measuring hole is 0.2D from the outlet end of the outlet bend 3. In this embodiment, the first pressure measuring component is a first pressure transmitter, and the second pressure measuring component is a second pressure transmitter.

[0042] In this embodiment, the method for adjusting the dynamic and static distance between the impeller 6 and the front guide vane 7 is as follows: (1) Remove the positioning pin 10 and remove the front guide vane 7; (2) Loosen the locking nut 9 at the shaft end; (3) Move the adjusting shim 8 on the inlet side of the impeller 6 to the outlet side of the impeller 6, which reduces the dynamic and static distance between the impeller 6 and the front guide vane 7; and move the adjusting shim 8 on the outlet side of the impeller 6 to the inlet side of the impeller 6, which increases the dynamic and static distance between the impeller 6 and the front guide vane 7. The dynamic and static distance adjustment is achieved by moving the axial position of the impeller 6.

[0043] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A performance measurement and testing device for a front-guided vane propulsion pump, characterized in that, The system includes a test pump section, a rotary drive component, a circulation pipeline, a first pressure measuring component, a second pressure measuring component, and a torque sensor. The test pump section includes an impeller chamber, a hollow connector, an outlet bend, a support frame, a pump shaft, an impeller, a front guide vane, a locking component, and multiple adjusting shims. The impeller chamber, the hollow connector, and the outlet bend are connected sequentially. The support frame is disposed inside the hollow connector. The pump shaft is rotatably fitted within the support frame. The rear end of the pump shaft extends to the outside through the outlet bend and is connected to the rotary drive component via the torque sensor. The components are connected, and from front to back, the front end of the pump shaft is sequentially fitted with several adjusting shims, the impeller, and several more adjusting shims. The rearmost adjusting shim is axially limited by the limiting shoulder of the pump shaft, and the foremost adjusting shim is axially limited by the locking component installed on the pump shaft. The impeller and the adjusting shims are both circumferentially limited relative to the pump shaft. The front guide vane is disposed at the front end of the impeller chamber, and the front guide vane is circumferentially limited relative to the impeller chamber. One end of the circulation pipeline is connected to the... The impeller chamber is connected, and the other end of the circulation pipe is connected to the outlet bend. The front and rear ends of the front guide vane are axially limited by one end of the circulation pipe and the step of the impeller chamber, respectively. The first pressure measuring component is located at the inlet of the impeller chamber, and the second pressure measuring component is located at the outlet of the outlet bend. The front guide vane includes a guide hub, a rim fixing shell, and multiple blades. The outer ends of each blade are fixed to the inner wall of the rim fixing shell, and the inner ends of each blade are fixed to the inner wall of the guide hub. The housing is located at the front end of the impeller chamber. The front and rear ends of the rim fixing housing are axially limited by one end of the circulation pipeline and the step of the impeller chamber, respectively. The test pump section also includes a positioning pin. A first positioning half-hole is provided on the outer wall of the rim fixing housing, and the first positioning half-hole penetrates the front end of the rim fixing housing. A second positioning half-hole is provided on the inner wall of the impeller chamber, and the second positioning half-hole penetrates the front end of the impeller chamber. The first positioning half-hole and the second positioning half-hole are joined to form a positioning hole, and the positioning pin is disposed in the positioning hole.

2. The performance measurement and testing device for a front-guided vane propulsion pump according to claim 1, characterized in that, The pump shaft includes a first shaft section, a second shaft section, and a third shaft section arranged sequentially from front to back. The locking component is disposed on the first shaft section. A flat key is disposed on the second shaft section. The inner walls of the impeller and the adjusting shim are both provided with keyways that match the structure of the flat key. A limiting shoulder is formed between the second shaft section and the third shaft section. The third shaft section is rotatably sleeved in the support frame. The rear end of the third shaft section extends to the outside through the outlet bend and is connected to the rotary drive component through the torque sensor.

3. The performance measurement and testing device for a front-guided vane propulsion pump according to claim 2, characterized in that, The first shaft segment is provided with external threads, and the locking component includes a plurality of locking nuts. The locking nuts are installed on the first shaft segment and can abut against the adjusting shim at the front end.

4. The performance measurement and testing device for a front-guided vane propulsion pump according to claim 1, characterized in that, The support frame includes a support hub and multiple connecting rods. One end of each connecting rod is fixed to the inner wall of the hollow connector, and the other end of each connecting rod is fixed to the outer wall of the support hub. The pump shaft is disposed in the support hub. The test pump section also includes a first skeleton oil seal, a second skeleton oil seal, and a bearing. The first skeleton oil seal, the bearing, and the second skeleton oil seal are disposed sequentially from front to back in the support hub and sleeved on the pump shaft.

5. The performance measurement and testing device for a front-guided vane propulsion pump according to claim 1, characterized in that, It also includes a booster pump, a flow meter, a first regulating ball valve, a first pressure stabilizing tank, a second pressure stabilizing tank, and a second regulating ball valve. The first regulating ball valve, the first pressure stabilizing tank, the flow meter, the booster pump, the second pressure stabilizing tank, and the second regulating ball valve are sequentially arranged on the circulation pipeline from the end connected to the outlet bend to the end connected to the impeller chamber.

6. The performance measurement and testing device for a front-guided vane propulsion pump according to claim 1, characterized in that, The thickness of each adjusting shim is 0.025D~0.1D, where D is the outer diameter of the impeller; the adjustable range of the dynamic and static distance between the front guide vane and the impeller is 0.1D~0.4D.

7. The performance measurement and testing device for a front-guided vane propulsion pump according to claim 1, characterized in that, The hollow connector is a connecting flange. The front end of the connecting flange is connected to the impeller chamber by multiple bolts and multiple nuts, and the rear end of the connecting flange is connected to the outlet bend by multiple bolts and multiple nuts.

Images