A test platform for a multi-stage pump

Abstract

The application provides a test platform for a multi-stage pump, comprising an experimental platform, a power support outlet assembly, a turnover mechanism and a movable mounting platform; the experimental platform has a two-layer structure, the upper layer is a mounting and maintenance area, and the lower layer is a box with a test medium; the power support outlet assembly is installed on the upper layer of the experimental platform, and is connected with a test section of the multi-stage pump; the turnover mechanism is located between the experimental platform and the power support outlet assembly, and is used for driving the power support outlet assembly to drive the test section of the multi-stage pump to turn over between a vertical test position in the box of the lower layer of the experimental platform and a horizontal maintenance position of the mounting and maintenance area; the movable mounting platform is arranged on the experimental platform, and is used for moving to the lower side of the test section of the multi-stage pump and providing support when the test section is in the horizontal maintenance position. The application facilitates quick mounting, dismounting and maintenance test of the test section of the multi-stage pump.

Description

Technical Field

[0001] This invention relates to the field of multistage pump testing, and in particular to a testing platform for multistage pumps. Background Technology

[0002] Multistage pumps, as important fluid transport equipment, are widely used in petrochemical, mine drainage, and urban water supply fields due to their ability to provide high heads. The performance characteristics of multistage pumps, such as head-displacement curves, shaft power-displacement curves, efficiency-displacement curves, and axial force-displacement curves, are key indicators for their design and application. Therefore, during research and development and production, it is essential to conduct precise and safe performance tests on the test section (i.e., the pump core) of the multistage pump using a specialized testing platform.

[0003] In traditional testing platforms, the multi-stage pump test section is typically installed vertically within the test medium tank. When it's necessary to replace the test section with a different model or perform maintenance, the operation is extremely inconvenient, usually requiring the use of large hoisting equipment to vertically lift the entire test section out of the tank. This process is not only time-consuming and labor-intensive, but also poses safety risks and can easily cause impact damage to the delicate pump body during hoisting.

[0004] Traditional testing platforms have a loosely arranged layout of pipes, drive units, water tanks, etc., which takes up a lot of space. At the same time, when changing test pipes (such as different pipe diameters), a large number of flange bolts need to be manually disassembled and installed, which is cumbersome, resulting in long test preparation time and low overall testing efficiency.

[0005] Traditional testing platforms cannot accurately measure axial force. Due to slight machining errors in the axial dimensions of the pump shaft in each test section, gaps in the axial direction at the connection point can easily occur during connection, resulting in inaccurate transmission of axial force. This is especially true when the operating conditions of multi-stage pumps change, causing variations in axial force. In extreme cases, the axial force may even change direction, leading to distorted axial force measurement results and affecting data accuracy. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a testing platform for multi-stage pumps. Through the cooperation of a flipping mechanism and a power support outlet assembly, the multi-stage pump test section can be flipped 90° from a vertical position to a horizontal position, facilitating quick installation, disassembly, and maintenance. Furthermore, the axial force measuring mechanism features a modular design, allowing it to be installed on test sections of different models of multi-stage pumps for easy disassembly. Moreover, different axial force measuring mechanisms with varying measurement ranges can be replaced as needed. This modular design enables precise measurement of the axial force in the multi-stage pump test section, achieving the goal of obtaining an "axial force-displacement" curve.

[0007] The present invention achieves the above-mentioned technical objectives through the following technical means.

[0008] A test platform for a multistage pump includes an experimental platform, a power support outlet assembly, a tilting mechanism, and a movable installation platform. The experimental platform has a two-layer structure: an upper layer is an installation and maintenance area, and a lower layer is a housing containing the test medium. The power support outlet assembly is installed on the upper layer of the experimental platform and connects to the multistage pump test section, providing power and a water outlet for the test section. The tilting mechanism is located between the experimental platform and the power support outlet assembly, driving the power support outlet assembly to tilt the multistage pump test section between a vertical test position within the housing on the lower layer of the experimental platform and a horizontal maintenance position in the installation and maintenance area. The movable installation platform is disposed on the experimental platform and is used to move beneath the multistage pump test section when it is in the horizontal maintenance position, providing support thereunder.

[0009] Furthermore, the experimental platform is L-shaped and includes a water tank, a hollow section, and a test and maintenance section connected in sequence; the water tank contains the test medium and is connected to a pipeline with a valve at its upper part; the power support outlet assembly is installed on the upper layer of the test and maintenance section, and the lower layer of the test and maintenance section has a cavity communicating with the water tank; a flipping mechanism is installed inside the hollow section.

[0010] Furthermore, the tilting mechanism is a hydraulic cylinder, the cylinder body of which is hinged to the experimental platform housing, and the pull rod of which is hinged to the bottom of the power support outlet assembly.

[0011] Furthermore, the power support outlet assembly includes a mounting base, a motor, a rotating support base, a sleeve, and an intermediate shaft; the motor is mounted on the mounting base, and the output shaft of the motor is connected to one end of the intermediate shaft; the sleeve is mounted on the mounting base, one end of the sleeve is connected to the multi-stage pump test section, and the other end of the intermediate shaft passes through the sleeve and is connected to the pump shaft of the multi-stage pump test section; the rotating support base is mounted on the upper layer of the experimental platform, and support pipes are symmetrically arranged on both radial sides of the sleeve. The support pipes are mounted on the rotating support base through bearings to form a turning fulcrum; one of the support pipes is a water outlet pipe used to connect the inner cavity of the sleeve with an external pipeline.

[0012] Furthermore, it also includes a limiting device, which includes a limiting cylinder mounted on the rotating support and a limiting pin driven by it. The mounting base is provided with a positioning hole that cooperates with the limiting pin for locking the mounting base in the vertical test position.

[0013] Furthermore, the movable installation platform includes a transverse moving platform, a horizontal moving platform, and a lifting mechanism; the horizontal moving platform is installed on the side of the experimental platform and can move along a first horizontal direction; the lifting mechanism is installed on the horizontal moving platform; the transverse moving platform is installed on the lifting platform of the lifting mechanism and can move along a second horizontal direction perpendicular to the first horizontal direction; the maintenance platform is set on the transverse moving platform, and the maintenance platform is moved to the installation and maintenance area by moving the transverse moving platform in the second horizontal direction.

[0014] Furthermore, an axial force measuring mechanism is installed at the inlet end of the multi-stage pump test section to measure axial force. The axial force measuring mechanism includes a housing, a first shaft, a piston, an adjusting bolt, a tension-compression bidirectional sensor, and a second shaft. The housing has a first cavity connected to the end of the multi-stage pump test section via a flange and a second cavity separated from the first cavity. One end of the first shaft is connected to the pump shaft of the multi-stage pump test section, and the other end of the first shaft extends into the first cavity and is connected to a rotary joint, in which a thrust bearing is installed. A movable piston is provided in the second cavity, and the adjusting bolt is threadedly connected to the housing. The end of the adjusting bolt contacts one side of the piston to adjust its position. The tension-compression bidirectional sensor is installed on the other side of the piston. One end of the second shaft is connected to the tension-compression bidirectional sensor, and the other end of the second shaft passes through the housing, extends into the first cavity, and is connected to the inner ring of the thrust bearing.

[0015] Furthermore, it also includes a reset device located between the piston and the housing of the second cavity, for resetting the piston.

[0016] A method for using a test platform for a multi-stage pump includes the following steps:

[0017] Control the flipping mechanism to flip the power support outlet assembly and the connected multi-stage pump test section from the vertical test position to the horizontal maintenance position; operate the movable installation platform to move it below the multi-stage pump test section and support it; perform the replacement or maintenance operation of the multi-stage pump test section;

[0018] After the replacement or repair is completed, the movable installation platform is removed from the support position; the flipping mechanism is controlled to flip the power support outlet assembly and the connected multi-stage pump test section from the horizontal maintenance position back to the vertical test position and lock them in place; the multi-stage pump performance test is then performed.

[0019] The beneficial effects of this invention are as follows:

[0020] 1. The test platform for the multi-stage pump described in this invention, through the cooperation of the flipping mechanism and the power support outlet assembly, allows the multi-stage pump test section to be flipped 90° from a vertical state to a horizontal state, achieving the effect of quick and convenient installation, disassembly and maintenance of the multi-stage pump test section.

[0021] 2. The multi-stage pump testing platform of this invention features a two-layer structure: the upper layer is the installation and maintenance area, and the lower layer is a tank containing the test medium. This separation of installation / maintenance from the test medium facilitates both maintenance and testing. The L-shaped layout of the testing platform, including the test and maintenance section, the hollow section, and the water tank, optimizes space utilization, achieving a compact structure and convenient operation.

[0022] 3. The test platform for the multi-stage pump described in this invention, by installing a movable installation platform on the outside of the test and maintenance section, can support the bottom of the multi-stage pump test section in a horizontal state, thereby preventing damage to the power support outlet assembly from the cantilever and facilitating the replacement of the multi-stage pump test section.

[0023] 4. The multi-stage pump test platform of the present invention achieves the flipping of the mounting base by supporting the sleeve on the rotating support base. The limiting device can accurately limit the position to ensure that the multi-stage pump test section is in a vertical state after flipping, thus ensuring the stability and safety of the multi-stage pump test section during testing.

[0024] 5. The multistage pump test platform of the present invention has a modular axial force measuring mechanism, which can be installed on test sections of different models of multistage pumps and is easy to disassemble; moreover, axial force measuring mechanisms with different measurement ranges can be replaced as needed. The modular design of the axial force measuring mechanism can accurately measure the axial force of the multistage pump test section and achieve the purpose of obtaining the "axial force-displacement" curve.

[0025] 6. The multi-stage pump test platform of the present invention has a specific adjustment mechanism within the axial force measuring mechanism, which can change the axial position of the first shaft of the axial force measuring mechanism. This makes it applicable to different multi-stage pump test sections, avoids assembly errors, and improves measurement accuracy. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are some embodiments of the present invention. For those skilled in the art, it is obvious that other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 A three-dimensional diagram of the test platform for the multi-stage pump described in this invention, complete with a protective cover.

[0028] Figure 2 This is an internal cross-sectional view (with the protective cover removed) of the test platform for the multi-stage pump described in this invention.

[0029] Figure 3 This is a three-dimensional diagram of the experimental platform described in this invention.

[0030] Figure 4 This is a three-dimensional view of the power support outlet component described in this invention.

[0031] Figure 5 This is a three-dimensional diagram of the test section of the multi-stage pump described in this invention.

[0032] Figure 6 This is a three-dimensional view of the movable installation platform described in this invention.

[0033] Figure 7 This is a cross-sectional view of the axial force measuring mechanism described in this invention.

[0034] In the picture:

[0035] 1-Experimental platform; 1-1-Test and maintenance section; 1-2-Hollow section; 1-3-Water tank; 2-Tilting mechanism; 2-1-Hydraulic cylinder; 3-Multi-stage pump test section; 4-Power support outlet assembly; 4-1-Motor; 4-2-Mounting base; 4-3-Rotating support base; 4-4-Sleeve; 4-5-Intermediate shaft; 4-6-Limit cylinder; 4-7-Limit pin; 4-8-Support tube; 5-Axial force measuring mechanism; 5-1-First cavity; 5-2-Second cavity Cavity; 5-3-Piston; 5-4-Adjusting bolt; 5-5-Bidirectional tension / compression sensor; 5-6-Second shaft; 5-7-Thrust bearing; 5-8-First shaft; 5-9-Rotary joint; 5-10-Screw; 5-11-Reset spring; 5-12-Upper flange; 5-13-Lower flange; 5-14-End plate; 6-Movable installation platform; 6-1-Horizontal moving platform; 6-2-Horizontal moving platform; 6-3-Lifting mechanism; 6-4-Maintenance platform. Detailed Implementation

[0036] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0037] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the 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, and therefore should not be construed as a limitation of the invention. 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 indicated technical features. Thus, a feature defined with "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.

[0038] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] like Figure 1 and Figure 2 As shown, the multi-stage pump test platform of the present invention includes an experimental platform 1, a tilting mechanism 2, a power support outlet assembly 4, a multi-stage pump test section 3, and a movable installation platform 6; the experimental platform 1 has a two-layer structure, with an upper layer having an installation and maintenance area and a lower layer being a housing containing the test medium; the power support outlet assembly 4 is installed on the upper layer of the experimental platform 1 to provide power to the multi-stage pump test section 3; as... Figure 5As shown, the multistage pump test section 3 is a pump casing with at least one impeller and one guide vane. Both ends of the multistage pump test section 3 have flange structures for easy installation and disassembly as a test component. The flipping mechanism 2 and the power support outlet assembly 4 flip the power support outlet assembly 4 by 90°, thereby flipping the multistage pump test section 3 by 90°. This flips the multistage pump test section 3 from the lower layer of the experimental platform 1 containing the test medium to the upper layer of the experimental platform 1, which can be considered as flipping the multistage pump test section 3 from a vertical state to a horizontal state. The experimental platform 1 has a movable installation platform 6, which supports the bottom of the multistage pump test section 3 when it is in a horizontal state. The movable installation platform prevents damage to the power support outlet assembly 4 caused by cantilever and also supports the disassembled multistage pump test section 3, facilitating its replacement.

[0040] like Figure 3 As shown, for rational layout and full utilization of space, the experimental platform 1 is L-shaped. The experimental platform 1 includes a test and maintenance section 1-1, a hollow section 1-2, and a water tank 1-3. The water tank 1-3 contains the test medium, generally water. Different diameter pipes on the upper part of the water tank 1-3 can be switched via electric gate valves or electric / pneumatic ball valves for quick and convenient pipe selection. A power support outlet assembly 4 is installed on the upper layer of the test and maintenance section 1-1, and the lower layer of the test and maintenance section 1-1 has a cavity communicating with the water tank 1-3. The multi-stage pump test section 3 extends into the cavity during testing. A movable installation platform 6 is installed on the side of the test and maintenance section 1-1. A notch is provided between the upper and lower layers of the test and maintenance section 1-1 to facilitate the rotation of the multi-stage pump test section 3. Handrail steps are placed outside the test and maintenance section 1-1.

[0041] The hollow section 1-2 is located between the test and maintenance section 1-1 and the water tank 1-3, and is also the turning point of the L-shaped experimental platform 1. A tilting mechanism 2 is placed inside the hollow section 1-2. In this embodiment, the tilting mechanism 2 is a hydraulic cylinder 2-1. One end of the cylinder body of the hydraulic cylinder 2-1 is hinged to the inner wall of the hollow section 1-2, and one end of the pull rod of the hydraulic cylinder 2-1 is hinged to the bottom of the power support outlet assembly 4. The tilting of the multi-stage pump test section 3 is achieved by the retraction of the pull rod. A hydraulic pump station connected to the hydraulic cylinder 2-1 can also be placed in the hollow section 1-2.

[0042] like Figure 4As shown, the power support outlet assembly 4 includes a motor 4-1, a mounting base 4-2, a rotating support base 4-3, a sleeve 4-4, and an intermediate shaft 4-5. The motor 4-1 is fixed to the mounting base 4-2. The output shaft of the motor 4-1 is connected to one end of the intermediate shaft 4-5 via a first coupling. The intermediate shaft 4-5 is supported on a connecting plate on the mounting base 4-2. The sleeve 4-4 is mounted on the connecting plate. The other end of the intermediate shaft 4-5 passes through the connecting plate and is inserted into the sleeve 4-4. The sleeve 4-4 is connected to the multi-stage pump test section 3 via a flange, while the other end of the intermediate shaft 4-5 is connected to the pump shaft of the multi-stage pump test section 3 via a second coupling. Thus, the motor 4-1 drives the impeller in the multi-stage pump test section 3 to rotate via the intermediate shaft 4-5. Generally, a support bearing is installed inside the sleeve 4-4 to support the intermediate shaft 4-5. The mounting base 4-2 has a hinge support at its bottom that is hinged to one end of the pull rod of the hydraulic cylinder 2-1; the sleeve 4-4 has symmetrical support pipes 4-8 at both ends in the radial direction; the support pipes 4-8 at both ends are respectively mounted on the rotating support base 4-3 through bearings, acting as the rotation fulcrum for flipping; the rotating support base 4-3 is installed on the upper layer of the test and maintenance section 1-1 of the experimental platform 1. One of the two support pipes 4-8 is a blind pipe, and the other is a water outlet pipe. The support pipe 4-8 of the water outlet pipe is used to connect the inner cavity of the sleeve 4-4 with the pipeline at the upper part of the water tank 1-3. The support pipe 4-8 of the water outlet pipe is connected to the pipeline at the upper part of the water tank 1-3 through a flange.

[0043] The multistage pump test section 3 is flipped as follows: When the multistage pump test section 3 is in a vertical position, it is located in the cavity of the lower layer of the test and maintenance section 1-1; before flipping, close the pipeline valve on the upper part of the water tank 1-3, remove the bolts connecting the support pipe 4-8 of the outlet pipe to the pipeline, and at the same time ensure that the movable installation platform 6 is located outside the gap between the upper and lower layers of the test and maintenance section 1-1. Retract the pull rod of the hydraulic cylinder 2-1 to rotate the mounting base 4-2 90° around the pivot point, so that the multistage pump test section 3 is in a horizontal position.

[0044] like Figure 4 As shown, to ensure the precise positioning of the power support outlet assembly 4 during the flipping process, a limiting device is also included. The limiting device is used to ensure that the multi-stage pump test section 3 is in a vertical state. The limiting device includes a limiting cylinder 4-6 and a limiting pin 4-7. The limiting cylinder 4-6 is mounted on the rotating support base 4-3, and the limiting pin 4-7 is mounted on the pull rod of the limiting cylinder 4-6. The mounting base 4-2 has a positioning hole that matches the limiting pin 4-7. By inserting the limiting pin 4-7 into the positioning hole, the mounting base 4-2 is fixed together with the rotating support base 4-3. This ensures that the multi-stage pump test section 3 is in a vertical state and also ensures its stability during testing.

[0045] like Figure 6As shown, the movable installation platform 6 includes a transverse moving platform 6-1, a horizontal moving platform 6-2, and a lifting mechanism 6-3. The height of the experimental platform 1 is defined as the Z direction, the axial direction of the multi-stage pump test section 3 in a horizontal state is defined as the X direction, and the direction perpendicular to the X direction is defined as the Y direction. The horizontal moving platform 6-2 is installed outside the test and maintenance section 1-1. The horizontal moving platform 6-2 has a slider that moves along the X direction. The lifting mechanism 6-3 is installed on the slider that moves along the X direction. The transverse moving platform 6-1 is installed on the Z-direction lifting platform of the lifting mechanism 6-3. The transverse moving platform 6-1 has a maintenance platform 6-4 that moves along the Y direction. When the multistage pump test section 3 is in a horizontal state or about to become horizontal through the flipping mechanism 2, the lifting mechanism 6-3 raises the lateral moving platform 6-1. When the lateral moving platform 6-1 rises to the upper level of the test and maintenance section 1-1, the lateral moving platform 6-1 moves the maintenance platform 6-4 laterally to extend it below the multistage pump test section 3. Then the lifting mechanism 6-3 continues to rise so that the maintenance platform 6-4 is supported below the multistage pump test section 3. This allows for the maintenance or replacement of the multistage pump test section 3, or the installation of the axial force measuring mechanism 5, etc.

[0046] Multiple sensors are installed on the pipeline above the water tank in experimental platform 1 to measure the outlet pressure and outlet flow rate; a torque sensor is installed at the output end of motor 4-1; an ammeter is installed on motor 4-1 to measure the actual current; based on the above parameters, the "head-displacement" curve, "shaft power-displacement" curve, and "efficiency-displacement" curve of the multi-stage pump test section 3 can be obtained. For safety reasons, a transparent protective cover is installed on the outside of the pipeline above the water tank, and an industrial control computer is installed on the protective cover. The industrial control computer is connected to the sensors above and feeds back the measurement results to the industrial control computer.

[0047] To obtain the "axial force-displacement" curve for test section 3 of the multistage pump, an axial force measuring mechanism 5 is installed at the end of test section 3 of the multistage pump, such as... Figure 7As shown, the axial force measuring mechanism 5 includes a flanged housing, a tension / compression bidirectional sensor 5-5, a first shaft 5-8, and a second shaft 5-6. The flanged housing has a first cavity 5-1 and a second cavity 5-2 that are not interconnected. The flanged housing has an upper flange 5-12, a lower flange 5-13, and an end plate 5-14. The upper flange 5-12 and the lower flange 5-13 are connected to the first cavity 5-1 via an upper sleeve, and the lower flange 5-13 and the end plate 5-14 are connected to the second cavity 5-2 via a lower sleeve. One end of the first shaft 5-8 is connected to the pump shaft of the multi-stage pump test section 3 via a rigid coupling. The upper flange 5-12 is connected to the flange at the inlet end of the multi-stage pump test section 3. The other end of the first shaft 5-8 passes through the upper flange 5-12 and enters the first cavity 5-1. The other end of the first shaft 5-8 is connected to a rotary joint 5-9, and the outer ring of a thrust bearing 5-7 is installed inside the rotary joint 5-9. The second... A piston 5-3, movable along the wall, is installed inside cavity 5-2. One side of the piston 5-3 is connected to one end of an adjusting bolt 5-4, which is threaded to end plate 5-14. Rotating the adjusting bolt 5-4 changes the position of the piston 5-3 within the second cavity 5-2. A tension-compression bidirectional sensor 5-5 is installed on the other side of the piston 5-3. The tension-compression bidirectional sensor 5-5 is connected to one end of a second shaft 5-6. The other end of the second shaft 5-6 passes through the lower flange 5-13 and enters the first cavity 5-1, connecting to the inner ring of the thrust bearing 5-7 within the rotary joint 5-9. Since the inner ring of the thrust bearing 5-7 is tightly fitted to the second shaft 5-6, and the outer ring of the thrust bearing 5-7 is tightly fitted to the rotary joint 5-9, rotation of the outer ring of the thrust bearing 5-7 will not cause the inner ring of the thrust bearing 5-7 to rotate. Therefore, the second shaft 5-6 will not rotate, and the tension-compression bidirectional sensor 5-5 will not rotate. Sealing rings are provided on the flanges through which the first shaft 5-8 and the second shaft 5-6 pass, to ensure the sealing of the first cavity 5-1 and the second cavity 5-2; in addition, the first cavity 5-1 is filled with some lubricating oil to lubricate the thrust bearing 5-7.

[0048] Because the axial positions of the pump shafts in different multistage pump test sections 3 vary, when installing a new multistage pump test section 3, it is necessary to rotate the adjusting bolt 5-4 to move the piston 5-3 axially, thereby moving the second shaft 5-6 axially, and then moving the first shaft 5-8 axially via the rotary joint 5-9. This ensures that the first shaft 5-8 does not contact the pump shaft, avoiding contact caused by accumulated assembly errors, thus improving measurement accuracy. A reset device is provided between the flange between the two chambers and the piston 5-3. The reset device includes a screw 5-10 and a reset spring 5-11. The screw 5-10 is mounted on the flange between the two chambers, and the reset spring 5-11 is sleeved on the screw 5-10. The other end of the reset spring 5-11 contacts a groove on the piston 5-3, ensuring that the piston 5-3 is always in contact with the adjusting bolt 5-4.

[0049] The method of using the multi-stage pump test platform described in this invention specifically includes the following steps:

[0050] S01: Ensure that the movable installation platform 6 is located outside the gap in the test and maintenance section 1-1. The limit cylinder 4-6 drives the limit pin 4-7 to insert into the positioning hole of the mounting base 4-2, so that the power support outlet assembly 4 and the multi-stage pump test section 3 are stably in the vertical test position.

[0051] S02: Inspect all connections, seals, and electrical connections. Close the drain valve and open the corresponding valves on the upper pipeline of water tank 1-3. Start motor 4-1 to drive the multi-stage pump test section 3.

[0052] S03: Monitor and record data from pressure sensor, flow meter, torque sensor, ammeter and axial force measuring mechanism 5 through industrial control computer, and plot performance curves.

[0053] S04: After the test is completed, stop motor 4-1; close the valve on the upper pipeline of water tank 1-3.

[0054] S05: Replace the multi-stage pump test section 3, remove the bolts connecting the outlet pipe support pipe 4-8 to the pipeline, and drive the limit cylinder 4-6 to retract the limit pin 4-7, so that the mounting base 4-2 separates from the rotating support base 4-3.

[0055] S06: Operate the tilting mechanism 2 to slowly tilt the power support outlet assembly 4 and the multi-stage pump test section 3 90° to a horizontal position. At the same time, operate the movable installation platform 6 to raise the lifting mechanism 6-3 to the upper level of the test and maintenance section 1-1. Then, control the maintenance platform 6-4 to move laterally to directly below the multi-stage pump test section 3. Finally, fine-tune the lifting mechanism 6-3 to ensure it stably supports the multi-stage pump test section 3.

[0056] S07: Remove the connecting bolts between the inlet end of the multistage pump test section 3 and the upper flange 5-12, separate the first shaft 5-8 from the pump shaft of the multistage pump test section 3, and remove the axial force measuring mechanism 5; remove the connecting bolts between the outlet end of the multistage pump test section 3 and the sleeve 4-4, and separate the intermediate shaft 4-5 from the pump shaft of the multistage pump test section 3; then perform the replacement or maintenance operation of the multistage pump test section 3.

[0057] S08: After replacement or maintenance, connect both ends of the multi-stage pump test section 3 to the sleeve 4-4 and the axial force measuring mechanism 5 respectively; operate the movable installation platform 6 to remove the support position (even if it is located outside the test and maintenance section 1-1); control the flipping mechanism 2 to stretch, flip the power support outlet assembly 4 and the connected multi-stage pump test section 3 from the horizontal maintenance position back to the vertical test position and lock it.

[0058] S09: Conduct performance testing on the new multistage pump test section 3.

[0059] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0060] The detailed descriptions listed above are merely specific illustrations of feasible embodiments of the present invention and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A test platform for a multi-stage pump, characterized in that, The system includes an experimental platform (1), a power support outlet assembly (4), a flipping mechanism (2), and a movable installation platform (6). The experimental platform (1) has a two-layer structure, with the upper layer being an installation and maintenance area and the lower layer being a box containing the test medium. The power support outlet assembly (4) is installed on the upper layer of the experimental platform (1) and is connected to the multi-stage pump test section (3) to provide power and water outlet for the multi-stage pump test section (3). The flipping mechanism (2) is located between the experimental platform (1) and the power support outlet assembly (4) and is used to drive the power support outlet assembly (4) to flip the multi-stage pump test section (3) between the vertical test position in the box in the lower layer of the experimental platform (1) and the horizontal maintenance position in the installation and maintenance area. The movable installation platform (6) is set on the experimental platform (1) and is used to move to its lower position and provide support when the multi-stage pump test section (3) is in the horizontal maintenance position. The power support outlet assembly (4) includes a mounting base (4-2), a motor (4-1), a rotating support base (4-3), a sleeve (4-4), and an intermediate shaft (4-5); the motor (4-1) is mounted on the mounting base (4-2), and the output shaft of the motor (4-1) is connected to one end of the intermediate shaft (4-5); the sleeve (4-4) is mounted on the mounting base (4-2), and one end of the sleeve (4-4) is connected to the multi-stage pump test section (3); the intermediate shaft (4-5) 4-5) The other end passes through the sleeve (4-4) and is connected to the pump shaft of the multi-stage pump test section (3); the rotating support seat (4-3) is installed on the upper layer of the experimental platform (1), and the sleeve (4-4) is symmetrically provided with support pipes (4-8) on both radial sides. The support pipes (4-8) are installed on the rotating support seat (4-3) through bearings to form a flipping fulcrum; one of the support pipes (4-8) is a water outlet pipe, used to connect the inner cavity of the sleeve (4-4) with the external pipeline.

2. The test platform for the multi-stage pump according to claim 1, characterized in that, The experimental platform (1) is L-shaped and includes a water tank (1-3), a hollow section (1-2), and a test and maintenance section (1-1) connected in sequence. The water tank (1-3) contains the test medium and has a pipeline with a valve connected to its upper part. The power support outlet assembly (4) is installed on the upper layer of the test and maintenance section (1-1), and the lower layer of the test and maintenance section (1-1) has a cavity communicating with the water tank (1-3). A flipping mechanism (2) is installed inside the hollow section (1-2).

3. The test platform for the multi-stage pump according to claim 1, characterized in that, The flipping mechanism (2) is a hydraulic cylinder (2-1). The cylinder body of the hydraulic cylinder (2-1) is hinged to the shell of the experimental platform (1). The pull rod of the hydraulic cylinder (2-1) is hinged to the bottom of the power support outlet assembly (4).

4. The test platform for the multi-stage pump according to claim 3, characterized in that, It also includes a limiting device, which includes a limiting cylinder (4-6) mounted on the rotating support (4-3) and a limiting pin (4-7) driven by it. The mounting base (4-2) is provided with a positioning hole that cooperates with the limiting pin (4-7) for locking the mounting base (4-2) in the vertical test position.

5. The test platform for the multi-stage pump according to claim 3, characterized in that, The movable installation platform (6) includes a transverse moving platform (6-1), a horizontal moving platform (6-2), and a lifting mechanism (6-3); the horizontal moving platform (6-2) is installed on the side of the experimental platform (1) and can move along a first horizontal direction; the lifting mechanism (6-3) is installed on the horizontal moving platform (6-2); the transverse moving platform (6-1) is installed on the lifting platform of the lifting mechanism (6-3) and can move along a second horizontal direction perpendicular to the first horizontal direction; the maintenance platform (6-4) is set on the transverse moving platform (6-1), and the maintenance platform (6-4) is moved to the installation and maintenance area by moving the transverse moving platform (6-1) in the second horizontal direction.

6. The test platform for the multi-stage pump according to claim 1, characterized in that, An axial force measuring mechanism (5) is installed at the inlet end of the multi-stage pump test section (3) to measure axial force. The axial force measuring mechanism (5) includes a housing, a first shaft (5-8), a piston (5-3), an adjusting bolt (5-4), a tension-compression bidirectional sensor (5-5), and a second shaft (5-6). The housing has a first cavity (5-1) connected to the end of the multi-stage pump test section (3) via a flange and a second cavity (5-2) separated from the first cavity (5-1). One end of the first shaft (5-8) is connected to the pump shaft of the multi-stage pump test section (3), and the other end of the first shaft (5-8) extends into the first cavity (5-1) and is connected to a... A rotary joint (5-9) is provided, and a thrust bearing (5-7) is installed inside the rotary joint (5-9); a movable piston (5-3) is provided inside the second cavity (5-2); an adjusting bolt (5-4) is threadedly connected to the housing, and the end of the adjusting bolt (5-4) contacts one side of the piston (5-3) for adjusting the position of the piston (5-3); a tension-compression bidirectional sensor (5-5) is installed on the other side of the piston (5-3); one end of the second shaft (5-6) is connected to the tension-compression bidirectional sensor (5-5), and the other end of the second shaft (5-6) passes through the housing and extends into the first cavity (5-1) and is connected to the inner ring of the thrust bearing (5-7).

7. The test platform for the multi-stage pump according to claim 6, characterized in that, It also includes a reset device, which is located between the piston (5-3) and the housing of the second cavity (5-2) for resetting the piston (5-3).

8. A method of using a test platform for a multi-stage pump as described in any one of claims 1-7, characterized in that, Includes the following steps: Control the operation of the flipping mechanism (2) to flip the power support outlet assembly (4) and the connected multi-stage pump test section (3) from the vertical test position to the horizontal maintenance position; operate the movable installation platform (6) to move it below the multi-stage pump test section (3) and support it; perform the replacement or maintenance operation of the multi-stage pump test section (3); After the replacement or repair is completed, the movable installation platform (6) is operated to remove the support position; the flipping mechanism (2) is controlled to flip the power support outlet assembly (4) and the connected multi-stage pump test section (3) from the horizontal maintenance position back to the vertical test position and lock them; the multi-stage pump performance test is carried out.

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