A pressure-resistant test equipment for dual-purpose mobile flood-prevention pump

Abstract

The present application relates to pressure test equipment technical field, specifically is a kind of dual-purpose mobile flood-prevention pump's pressure test equipment, the present application includes inverted T-shaped support frame, one end of the inverted T-shaped support frame is provided with mounting table, and the other end is symmetrically provided with docking pipe, and the docking pipe is respectively communicated with the inlet and outlet of the pump body to be measured.The present application constructs high-pressure flow water environment through closed circulation waterway, combines adjustable amplitude's vibration table and venturi cavitation generation structure, reproduces the real working condition that flood-prevention pump high-pressure water flow and gradient vibration, cavitation cooperate, and through the gap design of inverted L-shaped guide rod and T-shaped push rod, the working condition gradient control of "cavitation intensity is stable when small amplitude vibration, cavitation synchronous enhancement when large amplitude vibration" is realized, get rid of the limitation of existing static test no flow, no vibration and dynamic test working condition distortion, effectively improve the pressure test precision of pump body.

Description

Technical Field

[0001] This invention relates to the field of pressure resistance testing equipment technology, specifically a pressure resistance testing device for a dual-purpose mobile flood control pump. Background Technology

[0002] Dual-purpose mobile flood control pumps are key equipment for flood emergency rescue. In actual service, they need to withstand the combined working conditions of "high-pressure flowing water, vibration and impact, and cavitation damage" for a long time. When the pump body delivers high-pressure water, cavitation is easily generated in the flow channel due to changes in flow velocity. Vibrations of different intensities, such as the impact of floating objects and water flow, will further aggravate the water flow disturbance and amplify the damage of cavitation to the pump body flow channel and sealing structure. All these factors may induce pressure failure.

[0003] However, existing pressure testing technologies for dual-purpose mobile flood control pumps still primarily rely on static water pressure testing. This method involves sealing the pump body inlet and outlet with blind flanges, filling the pump body with water, applying a fixed pressure, and maintaining that pressure. This only verifies the structural strength of the pump body under "static high pressure, no water flow, and no vibration interference," neglecting the "turbulent pressure fluctuations caused by water flow" and "micro-displacement and stress concentration of the sealing surface caused by vibration" in actual operating conditions. Consequently, products that pass the static test often experience leakage or structural damage during actual use due to these factors.

[0004] The few dynamic testing schemes that attempt to introduce circulating water flow mostly superimpose vibration and cavitation, resulting in enhanced cavitation regardless of vibration intensity. This makes it impossible to clearly separate "basic testing" from "composite testing," leading to confusion of variables in the two sets of test data. For example, vibration amplitude and cavitation intensity cannot correspond, making it difficult to quantify the specific impact of "vibration exacerbating cavitation" on pressure resistance performance. Ultimately, this fails to provide an effective basis for optimizing pump reliability. Summary of the Invention

[0005] The purpose of this invention is to provide a pressure resistance testing device for a dual-purpose mobile flood control pump, so as to solve the problems mentioned in the background art.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A pressure resistance testing device for a dual-purpose mobile flood control pump, preferably comprising an inverted T-shaped support frame, wherein one end of the inverted T-shaped support frame is provided with a mounting platform, and the other end is symmetrically provided with connecting pipes, which are respectively connected to the inlet and outlet of the pump body to be tested;

[0008] A closed circulation water channel is provided on one side of the inverted T-shaped support frame. The closed circulation water channel contains a power pump that drives the water flow circulation. A Venturi tube is connected in series in the closed circulation water channel. The Venturi tube is located upstream of the inlet of the pump body under test.

[0009] The venturi tube is equipped with an axially movable conical piston to change the cross-sectional area of ​​its throat opening.

[0010] The mounting platform is equipped with a vibration table with adjustable amplitude and frequency. One end of the inverted T-shaped support frame is equipped with a mechanical linkage component, and the two ends of the component are respectively connected to the vibration table and the conical piston.

[0011] Both the venturi tube and the connecting tube are equipped with monitoring components. These components are used to monitor parameters such as water flow pressure and cavitation state during the test to ensure the accuracy and stability of the pressure resistance test.

[0012] Preferably, the closed-loop water channel includes a water storage tank and a water filter tank, with an inlet at the bottom of the venturi tube, and the input and output ends of the power pump are connected to the water storage tank and the inlet, respectively.

[0013] The venturi tube has an outlet at the top, which is connected to a connecting pipe. The other connecting pipe is connected to a water filter tank. The water filter tank is equipped with porous ceramic composite filter material and a guide pipe. One end of the guide pipe passes through the porous ceramic composite filter material and connects to the water storage tank.

[0014] Preferably, the vibration table includes guide slide rods symmetrically slidably connected to one side of the inverted T-shaped support frame. The guide slide rods are fixedly connected to the bottom of the mounting platform. I-beams are symmetrically arranged at the bottom of the mounting platform. A transmission roller is arranged in the middle section of the I-beam. An eccentric wheel is symmetrically rotatably connected to one side of the inverted T-shaped support frame. The eccentric wheel rolls against the transmission roller. A hollow cylinder is symmetrically fixedly connected to one side of the inverted T-shaped support frame. The bottom of the I-beam is slidably arranged inside the hollow cylinder, and a return spring is sleeved on the outer periphery of the I-beam.

[0015] Preferably, the vibration table further includes a bevel gear one fixedly connected to one end of the eccentric wheel, a bevel gear two meshing with the bevel gear one rotatably connected to one side of the inverted T-shaped support frame, a worm gear fixedly connected to the bottom of the bevel gear two, a worm gear meshing with the worm gear rotatably connected to one side of the inverted T-shaped support frame, a motor one fixedly connected to one side of the inverted T-shaped support frame, and the output end of the motor one fixedly connected to the worm gear.

[0016] Preferably, the vibration table further includes a bevel gear three rotatably connected to the bottom of the hollow cylinder. One end of the bevel gear three is threadedly connected to an adjusting screw. One end of the adjusting screw extends into the interior of the hollow cylinder and is fixedly connected to an adjusting slider. The adjusting slider abuts against the bottom of the I-beam. One end of the adjusting slider is symmetrically fixedly connected to a guide slider. The inner side of the hollow cylinder is symmetrically provided with guide grooves adapted to the guide sliders.

[0017] Preferably, the vibration table further includes an adjustment shaft rotatably connected to one end of the inverted T-shaped support frame. One end of the adjustment shaft is symmetrically and fixedly connected to a bevel gear four that meshes with bevel gear three. The middle section of the adjustment shaft is fixedly connected to a bevel gear five. One end of the inverted T-shaped support frame is fixedly connected to a motor two. The output end of the motor two is fixedly connected to a bevel gear six that meshes with bevel gear five.

[0018] Preferably, the mechanical linkage assembly includes an adjusting slide rod fixedly connected to the top of the conical piston. The top of the adjusting slide rod passes through a venturi tube and is fixedly connected to an inverted L-shaped guide rod. A sleeve is fixedly connected to one side of the inverted T-shaped support frame. One end of the inverted L-shaped guide rod passes through the sleeve and is fixedly connected to a pair of limiting rings. The two limiting rings are respectively located at both ends of the sleeve. A limiting spring is sleeved on the outer periphery of the inverted L-shaped guide rod. The limiting spring is located between the two limiting rings and abuts against the sleeve. A bellows is sleeved on the outer periphery of the adjusting slide rod. The bottom of the bellows is fixedly connected to the outer periphery of the adjusting slide rod, and the top of the bellows is fixedly connected to the inner top of the venturi tube.

[0019] Preferably, the mechanical linkage assembly further includes a guide slide rail fixedly connected to one side of the inverted T-shaped support frame, a transmission rack slidably connected inside the guide slide rail, and a T-shaped push rod aligned with the limit spring fixedly connected to the top of the transmission rack, which is used to abut against the limit spring to push the inverted L-shaped guide rod.

[0020] One end of the inverted T-shaped support frame is rotatably connected to a transmission gear that meshes with the transmission rack. The transmission gear is connected to the bevel gear four via synchronous pulley one, synchronous belt, and synchronous pulley two.

[0021] Preferably, the throat of the venturi tube is provided with an air supply pipe with a valve, and the air supply pipe is provided with a one-way valve. The one-way valve only allows air to enter the interior of the venturi tube from the outside, so as to assist in the formation of cavitation.

[0022] Preferably, the monitoring components include a first pressure sensor at the throat of the venturi tube, an optical bubble sensor in the outlet, and a second pressure sensor in the connecting pipe.

[0023] The beneficial effects of this invention are:

[0024] 1. This invention constructs a high-pressure flowing water environment through a closed-loop circulation channel. Combined with an adjustable amplitude vibration table and a Venturi tube cavitation generation structure, it reproduces the real working conditions of high-pressure water flow, gradient vibration, and cavitation synergy of flood control pumps. Furthermore, through the gap design of the inverted L-shaped guide rod and the T-shaped push rod, it achieves gradient control of the working conditions, which ensures stable cavitation intensity during small-amplitude vibrations and synchronous enhancement of cavitation during large-amplitude vibrations. This overcomes the limitations of existing static tests that lack flow and vibration, as well as the distortion of dynamic test conditions, and effectively improves the accuracy of the pump's pressure resistance test.

[0025] 2. Through gap design and mechanical linkage components, this invention can monitor basic data of "small amplitude vibration and basic cavitation" and composite data of "large amplitude vibration and enhanced cavitation". The two sets of data have a variable of "whether cavitation increases with vibration". After eliminating interference factors, it can help to judge the impact of "vibration aggravates cavitation" on pressure resistance performance and understand the pump body's shock resistance and pressure resistance limit.

[0026] 3. This invention achieves synchronous movement of the vibration table and the conical piston through a mechanical linkage component. When the vibration amplitude increases, the opening of the venturi throat can be reduced synchronously to ensure that the cavitation intensity increases precisely with vibration. At the same time, a closed-loop regulation is formed based on the first pressure sensor, the optical bubble sensor, and the second pressure sensor. When the flow field is turbulent, the motor parameters can be adjusted in real time to restore stability, avoiding data distortion caused by uncontrolled operating conditions and ensuring the stability of the testing process. Attached Figure Description

[0027] 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. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the overall structure of the pressure resistance testing equipment in this invention;

[0029] Figure 2 This is a schematic diagram of the back structure of the pressure resistance testing equipment in this invention;

[0030] Figure 3 This is a front structural diagram of the pressure resistance testing equipment in this invention;

[0031] Figure 4 This is a schematic diagram of the internal structure of the Chinese-language tube of the present invention;

[0032] Figure 5 This is a schematic diagram of the internal structure of the water filter tank in this invention;

[0033] Figure 6 This is a schematic diagram of the internal structure of the hollow cylinder in this invention;

[0034] Figure 7 This is a three-dimensional structural diagram of the eccentric wheel in this invention;

[0035] Figure 8 This is an exploded view of the internal structure of the hollow cylinder in this invention;

[0036] Figure 9 This is a three-dimensional structural diagram of the transmission rack in this invention.

[0037] The attached diagram is labeled as follows: 1. Inverted T-shaped support frame; 2. Mounting platform; 3. Connecting pipe; 4. Venturi tube; 5. Conical piston; 6. Air supply pipe; 7. One-way valve; 8. Water storage tank; 9. Filter tank; 10. Power pump; 11. Inlet; 12. Outlet; 13. Porous ceramic composite filter media; 14. Guide pipe; 15. Guide slide rod; 16. I-beam; 17. Drive roller; 18. Eccentric wheel; 19. Hollow cylinder; 20. Return spring; 21. Bevel gear one; 22. Bevel gear two; 23. Worm gear; 24. Worm; 25. Motor one; 26. Bevel gear three. 27. Adjusting screw; 28. Adjusting slider; 29. ​​Guide slider; 30. Guide groove; 31. Adjusting shaft; 32. Bevel gear four; 33. Bevel gear five; 34. Motor two; 35. Bevel gear six; 36. Adjusting slide rod; 37. Inverted L-shaped guide rod; 38. Sleeve; 39. Limiting ring; 40. Limiting spring; 41. Guide slide rail; 42. Transmission rack; 43. T-shaped push rod; 44. Transmission gear; 45. Synchronous pulley one; 46. Synchronous pulley two; 47. Synchronous belt; 48. Bellows; 49. Optical bubble sensor; 50. Second pressure sensor. Detailed Implementation

[0038] 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.

[0039] A pressure resistance testing device for a dual-purpose mobile flood control pump belongs to the field of flood control equipment testing equipment technology. It is specifically used for multi-condition simulation testing and pressure resistance performance reliability control in the production process of dual-purpose mobile flood control pumps in the field of flood control equipment. It also integrates the functions of vibration amplitude and cavitation intensity linkage adjustment and automatic triggering of working condition recovery in the event of flow field disturbance.

[0040] like Figures 1-8 As shown, it includes an inverted T-shaped support frame 1, one end of which is provided with a mounting platform 2, and the other end is symmetrically provided with connecting pipes 3, which are respectively connected to the inlet and outlet of the pump body to be tested;

[0041] A closed circulation water channel is provided on one side of the inverted T-shaped support frame 1. The closed circulation water channel includes a power pump 10 that drives the water flow circulation. A Venturi tube 4 is connected in series in the closed circulation water channel. The Venturi tube 4 is located upstream of the inlet of the pump body under test.

[0042] The Venturi tube 4 contains a tapered inlet section, a throat, and a tapered diffuser section. The Venturi tube 4 is equipped with an axially movable conical piston 5, which is used to change the cross-sectional area of ​​its throat opening. The flow channel forms a low-pressure area and generates cavitation through the change of the throat opening cross-section. The intensity of cavitation is controlled by the conical piston 5, providing a controllable cavitation environment for testing.

[0043] The mounting platform 2 is equipped with a vibration table with adjustable amplitude and frequency. One end of the inverted T-shaped support frame 1 is equipped with a mechanical linkage component, and its two ends are respectively connected to the vibration table and the conical piston 5.

[0044] Both the Venturi tube 4 and the connecting tube 3 are equipped with monitoring components. These components are used to monitor parameters such as water flow pressure and cavitation state during the test to ensure the accuracy and stability of the pressure resistance test.

[0045] The closed-loop water channel includes a water storage tank 8 and a water filter tank 9. The bottom of the venturi tube 4 is provided with a water inlet 11. The input end and output end of the power pump 10 are connected to the water storage tank 8 and the water inlet 11, respectively.

[0046] The Venturi tube 4 is provided with an outlet 12 at the top. The outlet 12 is connected to a connecting pipe 3, and the other connecting pipe 3 is connected to the water filter box 9. The water filter box 9 is provided with a porous ceramic composite filter material 13 and a guide pipe 14. One end of the guide pipe 14 passes through the porous ceramic composite filter material 13 and is connected to the water storage tank 8.

[0047] Furthermore, the vibration table includes a guide slide rod 15 symmetrically slidably connected to one side of the inverted T-shaped support frame 1. The guide slide rod 15 is fixedly connected to the bottom of the mounting platform 2. I-beams 16 are symmetrically arranged at the bottom of the mounting platform 2. A transmission roller 17 is arranged in the middle section of the I-beams 16. An eccentric wheel 18 is symmetrically rotatably connected to one side of the inverted T-shaped support frame 1. The eccentric wheel 18 rolls against the transmission roller 17. A hollow cylinder 19 is symmetrically fixedly connected to one side of the inverted T-shaped support frame 1. The bottom of the I-beams 16 is slidably arranged inside the hollow cylinder 19, and a return spring 20 is sleeved on the outer periphery of the I-beams 16.

[0048] Furthermore, the mechanical linkage assembly includes an adjusting slide rod 36 fixedly connected to the top of the conical piston 5. The top of the adjusting slide rod 36 passes through the venturi tube 4 and is fixedly connected to an inverted L-shaped guide rod 37. A sleeve 38 is fixedly connected to one side of the inverted T-shaped support frame 1. One end of the inverted L-shaped guide rod 37 passes through the sleeve 38 and is fixedly connected to a pair of limiting rings 39. The two limiting rings 39 are respectively set at both ends of the sleeve 38. A limiting spring 40 is sleeved on the outer periphery of the inverted L-shaped guide rod 37. The limiting spring 40 is set between the two limiting rings 39 and abuts against the sleeve 38. A bellows 48 is sleeved on the outer periphery of the adjusting slide rod 36. The bottom of the bellows 48 is fixedly connected to the outer periphery of the adjusting slide rod 36, and the top of the bellows 48 is fixedly connected to the inner top of the venturi tube 4.

[0049] When in use, first fasten the pump body to be tested to the mounting platform 2 with bolts and other fixing tools. The pump body inlet and outlet are sealed to the two side connecting pipes 3 through flanges. High pressure resistant sealing gaskets are installed on the flange contact surface to eliminate the risk of water leakage and make the pump body accurately connected to the closed circulation water channel.

[0050] In the closed-loop water channel, the input end of the power pump 10 is connected to the bottom of the water storage tank 8, and the output end is connected to the inlet 11 at the bottom of the venturi tube 4 through a pipe. The outlet 12 at the top of the venturi tube 4 is connected to one of the connecting pipes 3, and the other connecting pipe 3 is connected to the top of the filter tank 9. The porous ceramic composite filter material 13 inside the filter tank 9 and the guide pipe 14 connected to the water storage tank 8 together form a closed loop of water circulation. The porous ceramic composite filter material 13 can filter debris and residual bubbles generated in the circulation, effectively reducing debris clogging the throat of the venturi tube 4 and bubbles interfering with cavitation monitoring.

[0051] The guide slide 15 allows the mounting platform 2 to vibrate smoothly along a fixed trajectory. The transmission roller 17 in the middle section of the I-beam 16 rolls against the eccentric wheel 18, so that the rotational force of the eccentric wheel 18 can be completely converted into the up-and-down vibration of the mounting platform 2. The return spring 20 in the hollow cylinder 19 allows the mounting platform 2 to quickly return to its original position after vibration, avoiding the distortion of working conditions caused by the superposition of amplitudes.

[0052] When the adjusting slide bar 36 is raised or lowered, it drives the conical piston 5 to precisely change the throat opening. The bellows 48 on the outer periphery of the adjusting slide bar 36 can extend and retract flexibly with the slide bar, which not only isolates external air from entering the venturi tube 4 and interfering with the flow field, but also prevents water leakage.

[0053] like Figures 2-7 As shown, the vibration table also includes a bevel gear 21 fixedly connected to one end of the eccentric wheel 18, a bevel gear 22 meshing with the bevel gear 21 rotatably connected to one side of the inverted T-shaped support frame 1, a worm gear 23 fixedly connected to the bottom of the bevel gear 22, a worm 24 meshing with the worm gear 23 rotatably connected to one side of the inverted T-shaped support frame 1, a motor 25 fixedly connected to one side of the inverted T-shaped support frame 1, and the output end of the motor 25 fixedly connected to the worm 24.

[0054] The venturi tube 4 is equipped with an air supply pipe 6 with a valve at its throat. The air supply pipe 6 is equipped with a one-way valve 7, which only allows air to enter the venturi tube 4 from the outside to assist in the formation of cavitation.

[0055] Furthermore, the monitoring components include a first pressure sensor at the throat of the venturi tube 4, an optical bubble sensor 49 in the outlet 12, and a second pressure sensor 50 in the connecting pipe 3.

[0056] In use, in the closed circulation water channel, the power pump 10 drives the water in the water storage tank 8 to enter through the bottom inlet 11 of the venturi tube 4 at a preset high pressure gradient. The water flow is smoothly accelerated along the gradually narrowing flow channel of the inlet section and precisely guided to the throat. The conical piston 5 is pre-adjusted to the initial preset position so that the cross-sectional area of ​​the throat opening is matched with the water flow velocity, ensuring that the flow velocity increases sharply when the water flows through the throat. According to Bernoulli's principle, the increase in flow velocity directly drives the local pressure to drop synchronously below the vaporization pressure of water, providing the basic conditions for bubble generation.

[0057] At the same time, the valve of the air supply pipe 6 is opened, and outside air enters the throat through the one-way valve 7 to supplement the air volume required for cavitation. This not only avoids water backflow interference, but also quickly stabilizes the bubble generation state, and finally achieves the continuous generation of uniform microbubbles. Finally, the bubbles enter the pump body flow channel smoothly with the water flow, perfectly replicating the basic working condition of "water flow driving slight cavitation" when the pump body is running at low load.

[0058] If cavitation generation is unstable, i.e., when the optical bubble sensor 49 detects large fluctuations in bubble density, the valve of the air supply pipe 6 is opened, and external air passes through the air supply pipe 6. At this time, the one-way valve 7 only allows air to enter the venturi tube 4 to supplement the amount of air required for cavitation. At the same time, the one-way valve 7 can prevent water from flowing back into the air pipe, ensuring that cavitation is always generated controllably in the venturi tube 4, and avoiding air from directly entering the pump body and interfering with pressure monitoring.

[0059] After the bubble density stabilizes, start motor 25. Through the reduction transmission of worm gear 24 and worm wheel 23, drive bevel gear 22 and bevel gear 21 to rotate synchronously. Finally, make eccentric wheel 18 rotate smoothly. When the protruding part of eccentric wheel 18 pushes the transmission roller 17, the I-beam 16 compresses the return spring 20 and moves upward. After the protruding part leaves, the return spring 20 rebounds and drives the I-beam 16 to move downward. This process repeats, and the mounting platform 2 produces a small amplitude vibration.

[0060] At this time, because there is a preset gap between the inverted L-shaped guide rod 37 and the T-shaped push rod 43, the T-shaped push rod 43 remains stationary with the transmission rack 42 and does not contact the inverted L-shaped guide rod 37. Thus, the vibration only acts on the pump body, the opening of the venturi tube 4 throat remains unchanged, and the cavitation intensity is stable, so as to realize the single variable test of "small amplitude vibration and basic cavitation". At the same time, the second pressure sensor 50 in the connecting pipe 3 starts to continuously collect the pump body inlet and outlet pressures and record the pressure fluctuation range as a benchmark for subsequent evaluation of "the impact of vibration on cavitation on pressure resistance performance".

[0061] like Figures 2-9As shown, the vibration table also includes a bevel gear 26 rotatably connected to the bottom of the hollow cylinder 19. One end of the bevel gear 26 is threadedly connected to an adjusting screw 27. One end of the adjusting screw 27 extends into the interior of the hollow cylinder 19 and is fixedly connected to an adjusting slider 28. The adjusting slider 28 abuts against the bottom of the I-beam 16. One end of the adjusting slider 28 is symmetrically fixedly connected to a guide slider 29. The inner side of the hollow cylinder 19 is symmetrically provided with guide grooves 30 that are adapted to the guide slider 29.

[0062] The vibration table also includes an adjustment shaft 31 rotatably connected to one end of the inverted T-shaped support frame 1. One end of the adjustment shaft 31 is symmetrically fixedly connected to a bevel gear 4 32 that meshes with a bevel gear 3 26. The middle section of the adjustment shaft 31 is fixedly connected to a bevel gear 5 33. One end of the inverted T-shaped support frame 1 is fixedly connected to a motor 2 34. The output end of the motor 2 34 is fixedly connected to a bevel gear 6 35 that meshes with a bevel gear 5 33.

[0063] Furthermore, the mechanical linkage assembly also includes a guide rail 41 fixedly connected to one side of the inverted T-shaped support frame 1. A transmission rack 42 is slidably connected inside the guide rail 41. A T-shaped push rod 43 aligned with the limit spring 40 is fixedly connected to the top of the transmission rack 42, which is used to abut against the limit spring 40 to push the inverted L-shaped guide rod 37.

[0064] One end of the inverted T-shaped support frame 1 is rotatably connected to a transmission gear 44 that meshes with the transmission rack 42. The transmission gear 44 is connected to the bevel gear 32 via a synchronous pulley 45, a synchronous belt 47, and a synchronous pulley 46.

[0065] When it is necessary to simulate large-amplitude vibrations during pump operation, the starting motor 2 34 transmits power to the adjusting shaft 31 through the meshing of bevel gear 6 35 and bevel gear 5 33. The bevel gear 4 32 at both ends of the adjusting shaft 31 synchronously drives the bevel gear 3 26 to rotate. The bevel gear 3 26 is threadedly connected to the adjusting screw 27. When rotating, it drives the adjusting screw 27 to move axially. The adjusting slider 28 slides smoothly along the guide groove 30 with the screw and gradually comes into contact with the bottom of the I-beam 16, thereby limiting the downward stroke of the I-beam 16 and the vibration amplitude of the mounting platform 2.

[0066] While the adjusting shaft 31 rotates, the synchronous pulley 46 at one end drives the synchronous pulley 45 to rotate via the synchronous belt 47. The synchronous pulley 45 is rigidly connected to the transmission gear 44, which in turn drives the transmission rack 42 in the guide rail 41 to slide horizontally. This increases the vibration amplitude, and the T-shaped push rod 43 moves forward synchronously with the rack, eliminating the gap with the inverted L-shaped guide rod 37 and squeezing the limiting spring 40. This causes the conical piston 5 to move slowly upward along the axial direction, gradually reducing the cross-sectional area of ​​the throat opening of the venturi tube 4. After the throat opening is reduced, the water flow velocity is further increased, the local pressure is lower, and the cavitation intensity is significantly enhanced. At the same time, the optical bubble sensor 49 monitors the generated bubble density to reproduce the working condition of "vibration aggravates water flow disturbance, thereby amplifying cavitation damage". This solves the defect of "vibration and cavitation being disconnected and unable to simulate synergistic damage" in the existing test.

[0067] During the test, if the first pressure sensor at the throat of the venturi tube 4 detects an abnormal pressure rise, it indicates that cavitation has weakened. The control system will fine-tune the speed of motor 2 34 to allow the conical piston 5 to continue to descend and narrow the opening. If the optical bubble sensor 49 detects a sudden decrease in bubble density, it indicates that the flow field is turbulent. The output power of motor 1 25 will be reduced to decrease the vibration amplitude, ensuring that vibration and cavitation are always in a stable and coordinated state, and avoiding distortion of test data due to uncontrolled operating conditions.

[0068] After the composite test is completed, first turn off motor 1 25. Mounting platform 2 stops vibrating under the action of reset spring 20. Then, start motor 2 34 in reverse. Adjusting shaft 31 rotates in reverse, driving adjusting slider 28 to reset. T-shaped push rod 43 and guide rod re-form the gap. Conical piston 5 rises back to the initial position. Cavitation formation at the throat of venturi tube 4 is terminated. Finally, power pump 10 is turned off.

[0069] In the basic test, the pressure fluctuation range of the pump body at the inlet and outlet remained stable within the preset value, indicating that small-amplitude vibration and basic cavitation had little impact on the pressure resistance performance. In the composite test, if the pressure fluctuation range expanded to the preset range and there was no leakage, it indicated that the pump body still had qualified pressure resistance performance under the composite conditions of "large-amplitude vibration and enhanced cavitation". If the fluctuation exceeded the preset range or leakage occurred, it indicated that the pressure resistance performance of the pump body under extreme operating conditions was significantly reduced. By comparing the two sets of data, the degree of influence of "vibration aggravating cavitation" on the pressure resistance performance of the pump body can be determined, and the seismic pressure resistance limit of the pump body can be clarified.

[0070] Furthermore, regarding the static pressure resistance benchmark conditions of the foundation without cavitation and without vibration in this scheme, the aim is to eliminate the interference of the two variables of vibration and cavitation, and only verify the foundation pressure resistance performance of the pump body under test under simple high-pressure water flow. The specific process is as follows: turn off the motor 25 and motor 34 driving the vibration table, keep the eccentric wheel 18 in a stationary state, and no longer push the I-beam 16 through the transmission roller 17. Under the elastic force of the return spring 20 in the hollow cylinder 19, the I-beam 16 is stably in the initial downward limit position. The mounting platform 2 has no vertical vibration displacement, ensuring that the pump body under test is not affected by vibration impact throughout the process.

[0071] By reversing the starter motor 34, the adjusting shaft 31, bevel gear 32, and bevel gear 26 are driven to reverse the transmission, which drives the adjusting screw 27 and the adjusting slider 28 to move down and reset along the guide groove 30, thus releasing the limit on the I-beam 16. At the same time, the adjusting shaft 31 drives the transmission gear 44 to rotate in the opposite direction through the synchronous pulley 46 and the synchronous belt 47, so that the transmission rack 42 and the T-shaped push rod 43 retract to the initial position, maintaining the maximum gap with the inverted L-shaped guide rod 37, and not compressing the limit spring 40.

[0072] Under the action of its own weight and water pressure, the conical piston 5 descends to the lowest position along the axial direction of the venturi tube 4, adjusting the cross-sectional area of ​​the throat opening to the maximum. At this time, the flow velocity of the water flowing through the throat is significantly reduced. According to Bernoulli's principle, the local pressure in the throat is always higher than the vaporization pressure of water, so cavitation cannot be generated naturally. At the same time, the valve of the air supply pipe 6 at the throat of the venturi tube 4 is closed to prevent outside air from entering and assisting in the generation of cavitation, thus completely blocking the conditions for cavitation generation from a structural perspective.

[0073] During this process, the first pressure sensor at the throat of the venturi tube 4 detects that the pressure value is consistently higher than the vaporization pressure of water. The optical bubble sensor 49 does not detect any bubble signal throughout the process. The second pressure sensor 50 in the connecting pipe 3 records the pressure fluctuation range of the pump body inlet and outlet. If the pressure fluctuation is stable within the preset threshold and there is no leakage, it indicates that the basic pressure-resistant structure of the pump body is qualified under simple high-pressure water flow.

[0074] The working principle of the pressure resistance testing device for a dual-purpose mobile flood control pump provided by this invention is as follows:

[0075] First, the pump body to be tested is fixedly connected to the mounting platform 2 with bolts, and sealed to the connecting pipes 3 at both ends with flanges to form a stable water flow circulation loop in a closed circulation water channel. Then, the power pump 10 in the closed circulation water channel is started, so that the water flows out from the water storage tank 8, enters the pipeline through the inlet 11 at the bottom of the venturi tube 4, and is then delivered to the inlet of the pump body to be tested through the outlet 12 at the top of the venturi tube 4.

[0076] After flowing through the pump body, the water flows into the water filter tank 9 through another pair of pipes 3. After filtering out debris and residual air bubbles in the water through the porous ceramic composite filter material 13 inside the water filter tank 9, it flows back to the water storage tank 8 through the guide pipe 14 to complete the closed loop circulation and provide a continuous and stable high-pressure flowing water environment for testing.

[0077] The venturi tube 4 is connected in series upstream of the inlet of the pump body under test. The conical piston 5 inside it is initially in a preset position, so that the throat of the venturi tube 4 forms a specific opening cross-sectional area. When the water flows through the throat, the flow velocity increases sharply and the local pressure drops below the water vaporization pressure, continuously generating microbubbles. These bubbles enter the pump body flow channel with the water flow, replicating the basic cavitation state in actual operation. The air supply pipe 6 in the middle section of the venturi tube 4 and the one-way valve 7 inside the air supply pipe 6 can help supplement air. The one-way valve 7 only allows air to enter the interior of the venturi tube 4 from the outside, ensuring the stability of cavitation generation.

[0078] Then, the motor 25 drives the worm 24 to rotate. The worm 24 meshes with the worm wheel 23 for transmission. The bevel gear 22 at the top of the worm wheel 23 rotates synchronously, which in turn drives the two bevel gears 21 meshing with it to rotate. The bevel gear 21 is fixedly connected to the eccentric wheel 18, so that the eccentric wheel 18 rotates with the bevel gear 21. The eccentric wheel 18 rolls and contacts the transmission roller 17 in the middle section of the I-beam 16. In conjunction with the return spring 20 on the outer periphery of the I-beam 16 and the guide slide rod 15 on one side of the inverted T-shaped support frame 1, the mounting platform 2 is driven to generate an adjustable frequency vibration, simulating the vibration and impact encountered by the pump body during operation.

[0079] Next, under the condition that basic cavitation has formed and the circulating water flow is stable, due to the certain length of gap between the inverted L-shaped guide rod 37 and the T-shaped push rod 43, such as Figure 3 As shown, when the amplitude of the mounting platform 2 does not exceed the preset value range, the cross-sectional area of ​​the opening at the throat of the venturi tube 4 does not change with the amplitude intensity of the mounting platform 2. Through the pressure sensor inside the connecting pipe 3, the pressure stability data of the pump body under the action of high pressure water flow, foundation cavitation, and simple vibration is collected in real time. During this process, the flow velocity of the water is stable when it flows through the throat, and microbubbles are continuously generated.

[0080] When it is necessary to simulate the state of intensified cavitation due to vibration, the power is transmitted to the conical piston 5 through the mechanical linkage component: the starter motor 2 34 drives the adjusting shaft 31 to rotate, and the bevel gear 4 32 at both ends of the motor meshes with the bevel gear 3 26 at the bottom of the hollow cylinder 19. The synchronous pulley 2 46 at one end of the bevel gear 4 32 drives the synchronous pulley 1 45 to rotate through the synchronous belt 47. The synchronous pulley 1 45 is fixedly connected to the transmission gear 44, so that the transmission gear 44 drives the transmission rack 42 that meshes with it to slide along the guide rail 41.

[0081] The T-shaped push rod 43 at the top of the transmission rack 42 moves accordingly, abutting against the inverted L-shaped guide rod 37 and squeezing the limiting spring 40 to produce a contraction deformation. At the same time, the inverted L-shaped guide rod 37 passes through the sleeve 38 and drives the conical piston 5 to rise and fall axially through the adjusting slide rod 36, reducing the cross-sectional area of ​​the throat opening of the venturi tube 4, so that the throat flow velocity and turbulence intensity are increased synchronously, and the cavitation intensity is enhanced accordingly, in order to replicate the real working condition of vibration aggravating cavitation damage. A bellows 48 is provided to seal the connection end between the adjusting slide rod 36 and the venturi tube 4 to maintain a seal.

[0082] At the same time, the bevel gear 35 at the output end of the synchronous drive motor 2 34 meshes with the bevel gear 33 and drives the adjustment shaft 31 to rotate. Then, the adjustment screw 27 is moved through the bevel gear 3 26. The adjustment screw 27 drives the adjustment slider 28 to slide along the guide groove 30 on the inner side of the hollow cylinder 19 to adjust the contact position between the adjustment slider 28 and the bottom of the I-beam 16, so as to achieve a precise match between the vibration amplitude and the degree of cavitation enhancement.

[0083] Throughout the test, the first pressure sensor at the throat of the Venturi tube 4 monitors the low-pressure environment required for cavitation formation in real time, the optical bubble sensor 49 inside the outlet 12 captures changes in cavitation intensity, and the second pressure sensor 50 inside the connecting pipe 3 tracks the stability of the inlet and outlet pressures of the pump under test. When an abnormal rise in pressure is detected at the throat of the Venturi tube 4, or when the optical bubble sensor 49 detects a sudden decrease in the amount of bubbles generated, the vibration amplitude and frequency can be changed by adjusting the output parameters of motor 1 25 and motor 2 34 to fine-tune the position of the conical piston 5, restore stability, and ensure the authenticity and reliability of the test data.

[0084] After the test, motor 1 25 stops running, mounting platform 2 stops vibrating, motor 2 34 reverses its drive, driving adjusting slide bar 36 and conical piston 5 to return to their initial positions, cavitation formation at the throat of venturi tube 4 is terminated, and then power pump 10 is turned off.

[0085] In summary, by comparing the pressure stability data under two working conditions: First, when the gap between the L-shaped guide rod 37 and the T-shaped push rod 43 is not eliminated, the vibration amplitude of the mounting platform 2 does not exceed the preset value, the cross-sectional area of ​​the venturi tube 4 throat opening remains unchanged, and the pressure resistance data of the pump body under small-amplitude vibration and foundation cavitation; Second, after the gap between the inverted L-shaped guide rod 37 and the T-shaped push rod 43 is eliminated, the vibration amplitude of the mounting platform 2 exceeds the preset value, the cross-sectional area of ​​the venturi tube 4 throat opening shrinks synchronously, and the pressure resistance data of the pump body under large-amplitude vibration and enhanced cavitation, the difference between the two sets of data can help determine the degree of pressure resistance performance degradation of the pump body under the combined working conditions of vibration aggravation and cavitation, and clarify its seismic pressure resistance limit.

[0086] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A pressure resistance testing device for a dual-purpose mobile flood control pump, characterized in that: It includes an inverted T-shaped support frame (1), one end of which is provided with an installation platform (2), and the other end is symmetrically provided with connecting pipes (3), which are respectively connected to the inlet and outlet of the pump body to be tested; A closed circulation channel is provided on one side of the inverted T-shaped support frame (1). The closed circulation channel includes a power pump (10) that drives the water flow circulation. A venturi tube (4) is connected in series in the closed circulation channel. The venturi tube (4) is located upstream of the inlet of the pump body to be tested. The Venturi tube (4) is equipped with an axially movable conical piston (5) to change the cross-sectional area of ​​its throat opening. The mounting platform (2) is equipped with a vibration table with adjustable amplitude and frequency. One end of the inverted T-shaped support frame (1) is equipped with a mechanical linkage component, and the two ends of the frame are respectively connected to the vibration table and the conical piston (5). Both the Venturi tube (4) and the connecting tube (3) are equipped with monitoring components. The monitoring components are used to monitor the parameters of water flow pressure and cavitation state during the test process to ensure the accuracy and stability of the pressure resistance test. The vibration table includes a bevel gear three (26) rotatably connected to the bottom of the hollow cylinder (19). One end of the bevel gear three (26) is threadedly connected to an adjusting screw (27). One end of the adjusting screw (27) extends into the interior of the hollow cylinder (19) and is fixedly connected to an adjusting slider (28). The adjusting slider (28) abuts against the bottom of the I-beam (16). One end of the adjusting slider (28) is symmetrically fixedly connected to a guide slider (29). The inner side of the hollow cylinder (19) is symmetrically provided with guide grooves (30) that are adapted to the guide slider (29). The vibration table also includes an adjustment shaft (31) rotatably connected to one end of the inverted T-shaped support frame (1). One end of the adjustment shaft (31) is symmetrically fixedly connected to a bevel gear four (32) that meshes with bevel gear three (26). The middle section of the adjustment shaft (31) is fixedly connected to a bevel gear five (33). One end of the inverted T-shaped support frame (1) is fixedly connected to a motor two (34). The output end of the motor two (34) is fixedly connected to a bevel gear six (35) that meshes with bevel gear five (33). The mechanical linkage assembly includes an adjusting slide rod (36) fixedly connected to the top of the conical piston (5). The top of the adjusting slide rod (36) passes through the venturi tube (4) and is fixedly connected to an inverted L-shaped guide rod (37). A sleeve (38) is fixedly connected to one side of the inverted T-shaped support frame (1). One end of the inverted L-shaped guide rod (37) passes through the sleeve (38) and is fixedly connected to a pair of limiting rings (39). The two limiting rings (39) are respectively set at both ends of the sleeve (38). A limiting spring (40) is sleeved on the outer periphery of the inverted L-shaped guide rod (37). The limiting spring (40) is set between the two limiting rings (39) and abuts against the sleeve (38). A bellows (48) is sleeved on the outer periphery of the adjusting slide rod (36). The bottom of the bellows (48) is fixedly connected to the outer periphery of the adjusting slide rod (36), and the top of the bellows (48) is fixedly connected to the inner top of the venturi tube (4). The mechanical linkage assembly also includes a guide rail (41) fixedly connected to one side of the inverted T-shaped support frame (1). A transmission rack (42) is slidably connected inside the guide rail (41). A T-shaped push rod (43) aligned with the limiting spring (40) is fixedly connected to the top of the transmission rack (42). A gap is provided between the inverted L-shaped guide rod (37) and the T-shaped push rod (43) to abut against the limiting spring (40) and push the inverted L-shaped guide rod (37). One end of the inverted T-shaped support frame (1) is rotatably connected to a transmission gear (44) that meshes with the transmission rack (42). The transmission gear (44) is connected to the bevel gear (32) via a synchronous pulley (45), a synchronous belt (47), a synchronous pulley (46). The throat of the Venturi tube (4) is provided with an air supply pipe (6) with a valve. The air supply pipe (6) is provided with a one-way valve (7). The one-way valve (7) only allows air to enter the interior of the Venturi tube (4) from the outside, so as to assist in the formation of cavitation.

2. The pressure resistance testing equipment for a dual-purpose mobile flood control pump according to claim 1, characterized in that: The closed-loop waterway includes a water storage tank (8) and a water filter tank (9). The bottom of the venturi tube (4) is provided with a water inlet (11). The input end and output end of the power pump (10) are connected to the water storage tank (8) and the water inlet (11) respectively. The Venturi tube (4) is provided with an outlet (12) at the top. The outlet (12) is connected to a connecting pipe (3), and the other connecting pipe (3) is connected to the filter tank (9). The filter tank (9) is provided with a porous ceramic composite filter material (13) and a guide pipe (14). One end of the guide pipe (14) passes through the porous ceramic composite filter material (13) and is connected to the water storage tank (8).

3. The pressure resistance testing equipment for a dual-purpose mobile flood control pump according to claim 1, characterized in that: The vibration table also includes a guide slide rod (15) symmetrically slidably connected to one side of the inverted T-shaped support frame (1). The guide slide rod (15) is fixedly connected to the bottom of the mounting platform (2). The bottom of the mounting platform (2) is symmetrically provided with I-beams (16). The middle section of the I-beams (16) is provided with a transmission roller (17). One side of the inverted T-shaped support frame (1) is symmetrically rotatably connected with an eccentric wheel (18). The eccentric wheel (18) and the transmission roller (17) roll against each other. One side of the inverted T-shaped support frame (1) is symmetrically fixedly connected with a hollow cylinder (19). The bottom of the I-beams (16) is slidably located inside the hollow cylinder (19), and a return spring (20) is sleeved on the outer periphery of the I-beams (16).

4. The pressure resistance testing equipment for a dual-purpose mobile flood control pump according to claim 3, characterized in that: The vibration table also includes a bevel gear one (21) fixedly connected to one end of the eccentric wheel (18), a bevel gear two (22) meshing with the bevel gear one (21) rotatably connected to one side of the inverted T-shaped support frame (1), a worm gear (23) fixedly connected to the bottom of the bevel gear two (22), a worm (24) meshing with the worm gear (23) rotatably connected to one side of the inverted T-shaped support frame (1), a motor one (25) fixedly connected to one side of the inverted T-shaped support frame (1), and the output end of the motor one (25) fixedly connected to the worm (24).

5. The pressure resistance testing equipment for a dual-purpose mobile flood control pump according to claim 1, characterized in that: The monitoring components include a first pressure sensor installed at the throat of the venturi tube (4), an optical bubble sensor (49) installed in the outlet (12) of the venturi tube (4), and a second pressure sensor (50) installed in the connecting pipe (3). The first pressure sensor is used to monitor the pressure at the throat of the venturi tube to determine the cavitation formation conditions. The optical bubble sensor (49) is used to detect the density of cavitation bubbles to quantify the cavitation intensity. The second pressure sensor (50) is used to monitor the pressure fluctuations at the inlet and outlet of the pump body under test to evaluate its pressure resistance performance.

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