Ultrahigh-speed jet type liquid-solid two-phase flow erosive wear experimental device

Abstract

An ultra-high-speed jet type liquid-solid two-phase flow erosive wear experimental device comprises an experimental box body, a normal-pressure water storage tank, a sand storage tank, a high-pressure pump station, a sand supply device, a nozzle and a carrying disc. An airborne computer is arranged in the experiment box body, and the airborne computer is provided with a touch control type operation screen; the experiment box body, the normal-pressure water storage tank and the sand storage tank are distributed in parallel, the high-pressure pump station and the sand supply device are located on the inner side of the experiment box body, and the loading disc and the nozzle are distributed in parallel; a horizontal posture adjusting mechanism is arranged above the nozzle, a suspension arm is arranged on the horizontal posture adjusting mechanism, and a three-degree-of-freedom electric manipulator is arranged between the nozzle and the bottom of the suspension arm; a rotary posture adjusting motor is arranged between the loading disc and the experiment box body; a plurality of sample placing grooves are uniformly distributed in the loading disc along the circumferential direction. According to the scheme, cavitation erosion and erosion integrated simulation can be achieved, the ultra-high-speed jet flow capacity is achieved, the jet flow sand content, the jet flow attack angle and the jet flow distance can be accurately controlled, and erosive wear experiments of multiple sets of samples can be achieved at the same time under the same jet flow condition.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of scouring and wearing experiment, especially relates to a super high speed injection type liquid solid two phase flow scouring and wearing experiment device. BACKGROUND

[0002] Scouring and wearing is the damage phenomenon of metal surface under the action of high-speed corrosive fluid, it is related to the common influence of impact wearing and chemical corrosion, and is a more serious local corrosion form. For example, in the environment of high water head hydropower station, the scouring and wearing problem of high flow rate slurry to the water turbine is particularly serious, and currently, there is lack of relevant scouring and wearing experiment device capable of simulating high water head scouring, thereby hindering the research of scouring and wearing problem of water turbine of high water head hydropower station and the development of protection technology.

[0003] At present, the scouring and wearing experiment device under the laboratory environment is mainly divided into pipe flow type scouring and wearing experiment device, rotary scouring and wearing experiment device and injection type scouring and wearing experiment device according to the different types, but no matter what type is adopted, the core principle is to realize the relative motion between medium and sample, thereby simulating the scouring and wearing effect of fluid to material.

[0004] For the pipe flow type scouring and wearing experiment device, it mainly simulates the axial scouring and wearing of fluid to the inner wall of pipe, although it can simulate the actual working condition, but there are problems of large equipment volume, high experimental cost, low experimental flow rate and long experimental period. For example, the Chinese patent application with the application number 201310248151.4 discloses a pipe flow type inner wall scouring and wearing test device, the device mainly tests the tubular sample, although the simulation of inner wall scouring and wearing of sample can be realized, but the high flow rate environment simulation capability is lacked.

[0005] For the rotary scouring and wearing experiment device, it mainly generates tangential force through the interaction between the rotating sample and the static liquid, to realize the simulation of wearing and corrosion between the sample and the liquid, although different working conditions can be simulated, but the problem of low experimental flow rate still exists. For example, the Chinese patent application with the application number 201210309863.8 discloses a self-circulation solid-liquid phase scouring and corrosion experiment device, the device realizes the installation of sample pipe on the inner wall of closed container through the support, although the simulation of solid-liquid phase scouring and corrosion is realized in principle, but there is a big difference between the erosion form of sample in experiment and the actual form of high-speed water flow impact wearing water turbine.

[0006] Compared with the above, the injection type scouring and wearing experiment device generates high-speed medium flow impact sample through pump and nozzle, so that the scouring and wearing of sample is more similar to the working condition of water turbine.

[0007] For example, Yong Xingyue of Beijing University of Chemical Technology and others published the academic article of "Establishment and Test Verification of Fluid Mechanics Model of Jet Corrosion Test Device", which proposed a high-speed jet corrosion test device with jet velocity up to 150 m / s, and can be connected with an electrochemical workstation for electrochemical testing. However, the device lacks the ability of fluid solid erosion simulation, so it cannot realize the integrated simulation of cavitation and erosion in the operation process of the water turbine.

[0008] In addition, Liu Xiaobing of Sichuan University and others published the academic article of "Development of Impact Water Turbine Sediment Wear Test Test System", which proposed an impact water turbine sediment wear test test system with jet velocity up to 126 m / s. However, the applicable object of this system is a physical scale model of an impact water bucket, so the problem of high experimental cost exists, and the physical scale model cannot replace the initial material for evaluation, so the applicable range is narrow.

[0009] In addition, the Chinese patent application with the application number 201810242489.1 discloses a jet flow scouring wear test device, which has an attack angle and scouring distance adjustment function, and the jet assembly contains multiple nozzles, which can complete four tests at the same time under the same test conditions, that is, four groups of flow velocity test data can be obtained through one test, and the test cycle can be shortened. However, the device does not have super-high-speed jet flow capability and poor precision sand control capability. Practical new type content

[0010] In view of the problems existing in the prior art, the utility model provides a super-high-speed jet type liquid-solid two-phase flow scouring wear experimental device, which can realize integrated simulation of cavitation and erosion in the operation process of the water turbine, has super-high-speed jet flow capability, can accurately control the jet flow sand content, can accurately adjust the jet attack angle and jet distance, and can realize scouring wear experiments of multiple samples at the same time and under the same jet flow conditions.

[0011] In order to achieve the above object, the utility model discloses the following technical scheme: a kind of super high-speed injection type liquid-solid two-phase flow scouring abrasion experimental device, including experimental box, atmospheric water storage tank, sand storage tank, high-pressure pump station, sand feeder, nozzle and object carrier plate;The experimental box, atmospheric water storage tank and sand storage tank are distributed in parallel;The high-pressure pump station is arranged at the inner bottom of experimental box, and the water inlet of high-pressure pump station is sealed with the water outlet of atmospheric water storage tank by atmospheric water pipe, and the water outlet of high-pressure pump station is sealed with the water inlet of nozzle by pressure-resistant water pipe;The sand feeder is arranged in the inner side of experimental box and is located above high-pressure pump station, and the sand inlet of sand feeder is sealed with the sand outlet of sand storage tank by wear-resistant hose, and the sand outlet of sand feeder is sealed with the sand inlet of nozzle by wear-resistant hose;The nozzle is located in the inner side upper portion of experimental box;The object carrier plate is located in the inner side upper portion of experimental box, and the object carrier plate and nozzle are distributed in parallel and are consistent in height.

[0012] The experimental box is provided with an onboard computer, and the onboard computer is provided with a touch screen.

[0013] A horizontal posture adjusting mechanism is arranged on the inner side of the experimental box above the nozzle, and the horizontal posture adjusting mechanism comprises a horizontal posture adjusting motor, a screw rod, a screw nut sliding block and a guide sliding seat. The horizontal posture adjusting motor is fixedly installed on the guide sliding seat, and the guide sliding seat is fixedly installed on the experimental box. The screw rod is horizontally arranged, one end of the screw rod is coaxially and fixedly connected with the motor shaft of the horizontal posture adjusting motor, and the other end of the screw rod is rotatably connected to the guide sliding seat through a bearing. The screw nut sliding block is installed between the screw rod and the guide sliding seat, and the screw nut sliding block has only horizontal movement freedom relative to the guide sliding seat. A hanging arm is vertically installed on the screw nut sliding block, and the nozzle is arranged at the bottom of the hanging arm. The control end of the horizontal posture adjusting motor is electrically connected to the onboard computer.

[0014] A three-degree-of-freedom electric manipulator is installed between the nozzle and the hanging arm, and the nozzle serves as an end effector of the three-degree-of-freedom electric manipulator. The control end of the three-degree-of-freedom electric manipulator is electrically connected to the onboard computer.

[0015] A rotary posture adjusting motor is arranged between the object carrier plate and the experimental box, and the rotary posture adjusting motor is horizontally fixedly installed on the experimental box. The control end of the rotary posture adjusting motor is electrically connected to the onboard computer.

[0016] The object carrier plate is disc-shaped, and a plurality of sample placement grooves are arranged on the object carrier plate and evenly distributed along the circumferential direction of the object carrier plate.

[0017] A protective door is arranged on the experimental box beside the nozzle and the object carrier plate, and a transparent window is arranged on the protective door.

[0018] A liquid collecting groove is arranged below the nozzle and the carrier disc, and a liquid discharge pipe is connected to the bottom of the liquid collecting groove.

[0019] A foot bolt is arranged at each of the four corners of the bottom of the experimental box.

[0020] Universal casters are arranged at the bottom side of the experimental box, at the bottom side of the atmospheric water storage tank, and at the bottom side of the sand storage tank.

[0021] The super-high-speed jet type liquid-solid two-phase flow scouring and abrasion experimental device has the advantages that:

[0022] The super-high-speed jet type liquid-solid two-phase flow scouring and abrasion experimental device has the advantages that: BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 Fig. 1 is a structural schematic view of a super-high-speed jet type liquid-solid two-phase flow scouring and abrasion experimental device according to the present application;

[0024] Figure 2 Fig. 2 is a structural schematic view of a carrier disc according to the present application;

[0025] In the drawings, 1 is an experimental box, 2 is an atmospheric water storage tank, 3 is a sand storage tank, 4 is a high-pressure pump station, 5 is a sand feeder, 6 is a nozzle, 7 is a carrier disc, 8 is a horizontal posture adjusting mechanism, 9 is a boom, 10 is a three-degree-of-freedom electric manipulator, 11 is a sample placement groove, 12 is a protective door, 13 is a transparent window, 14 is a liquid collecting groove, 15 is a liquid discharge pipe, 16 is a foot bolt, 17 is a universal caster, and 18 is a touch-operated operation screen. DETAILED DESCRIPTION

[0026] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0027] As Figure 1As shown, an ultra-high-speed jet-type liquid-solid two-phase flow erosion wear experimental device includes an experimental chamber 1, an atmospheric pressure water tank 2, a sand storage tank 3, a high-pressure pump station 4, a sand feeder 5, a nozzle 6, and a loading plate 7; the experimental chamber 1, the atmospheric pressure water tank 2, and the sand storage tank 3 are arranged side by side; the high-pressure pump station 4 is located at the bottom inner side of the experimental chamber 1, and the inlet of the high-pressure pump station 4 is sealed to the outlet of the atmospheric pressure water tank 2 through an atmospheric pressure water pipe, and the outlet of the high-pressure pump station 4 is connected to a pressure-resistant... The water pipe is sealed and connected to the inlet of the nozzle 6; the sand feeder 5 is located inside the experimental chamber 1 and above the high-pressure pump station 4. The sand inlet of the sand feeder 5 is sealed and connected to the sand outlet of the sand storage tank 3 through a wear-resistant hose. The sand outlet of the sand feeder 5 is sealed and connected to the sand inlet of the nozzle 6 through a wear-resistant hose. The nozzle 6 is located on the upper inner side of the experimental chamber 1. The loading tray 7 is located on the upper inner side of the experimental chamber 1. The loading tray 7 and the nozzle 6 are arranged side by side and at the same height.

[0028] The experimental chamber 1 has a built-in airborne computer, which is equipped with a touch screen 18; the control terminals of the high-pressure pump station 4 and the sand feeder 5 are both electrically connected to the airborne computer.

[0029] A horizontal attitude adjustment mechanism 8 is provided inside the experimental chamber 1 above the nozzle 6. The horizontal attitude adjustment mechanism includes a horizontal attitude adjustment motor, a lead screw, a lead screw nut slider, and a guide slide. The horizontal attitude adjustment motor is fixedly mounted on the guide slide, and the guide slide is fixedly mounted on the experimental chamber 1. The lead screw is horizontally arranged, with one end coaxially fixed to the motor shaft of the horizontal attitude adjustment motor, and the other end rotatably connected to the guide slide through a bearing. The lead screw nut slider is installed between the lead screw and the guide slide, and the lead screw nut slider has only horizontal movement freedom relative to the guide slide. A boom 9 is vertically mounted on the lead screw nut slider, and the nozzle 6 is located at the bottom of the boom 9. The control terminal of the horizontal attitude adjustment motor is electrically connected to an onboard computer.

[0030] A three-degree-of-freedom electric manipulator 10 is installed between the nozzle 6 and the boom 9. The nozzle 6 serves as the end effector of the three-degree-of-freedom electric manipulator 10. The control terminal of the three-degree-of-freedom electric manipulator 10 is electrically connected to an onboard computer.

[0031] A rotary attitude adjustment motor is provided between the loading disk 7 and the experimental chamber 1. The rotary attitude adjustment motor is horizontally fixed on the experimental chamber 1, and the loading disk 7 and the motor shaft of the rotary attitude adjustment motor are coaxially connected. The control terminal of the rotary attitude adjustment motor is electrically connected to the onboard computer.

[0032] like Figure 2 As shown, the sample tray 7 is disc-shaped, and a plurality of sample placement slots 11 are provided on the sample tray 7, and the plurality of sample placement slots 11 are evenly distributed along the circumference of the sample tray 7.

[0033] The experimental box 1 is provided with a protective door 12 on the side of the nozzle 6 and the carrier plate 7, and the protective door 12 is provided with a transparent window 13.

[0034] A liquid collecting tank 14 is arranged below the nozzle 6 and the carrier plate 7, and the bottom of the liquid collecting tank 14 is connected with a liquid discharge pipe 15.

[0035] A supporting bolt 16 is arranged at each of the four corners of the bottom of the experimental box 1.

[0036] Universal casters 17 are arranged at the bottom side of the experimental box 1, at the bottom side of the normal-pressure water storage tank 2 and at the bottom side of the sand storage tank 3.

[0037] The following describes the one-time use process of the utility model in combination with the drawings:

[0038] In the embodiment, the high-pressure pump station 4 can satisfy the adjustment of the ultra-high-speed jet flow speed of 100 m / s to 260 m / s, and can satisfy the evaluation of the material erosion and abrasion resistance performance under the kilometer water head working condition; the normal-pressure water stored in the normal-pressure water storage tank 2 is clean water; the quartz sand is stored in the sand storage tank 3; the number of the sample placing grooves 11 on the carrier plate 7 is six, which can simultaneously satisfy the experimental needs of six different samples.

[0039] Firstly, the protective door 12 is opened, the carrier plate 7 is removed and moved out of the experimental box 1, six different samples are fixed into the six sample placing grooves 11 of the carrier plate 7, then the carrier plate 7 with the samples is sent back to the experimental box 1 and is fixed to the motor shaft of the rotary posture adjusting motor again, and finally the protective door 12 is closed.

[0040] The on-board computer is started, and the jet flow speed, the jet attack angle, the jet distance, the fluid sand content, the carrier plate 7 rotation speed and the experimental time are set through the touch control operation screen 18. Among them, the jet flow speed is adjusted by the high-pressure pump station 4, the jet attack angle is adjusted by the three-degree-of-freedom electric mechanical hand 10, the jet distance is adjusted by the horizontal posture adjusting mechanism 8, the fluid sand content is adjusted by the sand feeder 5, and the carrier plate 7 rotation speed is adjusted by the rotary posture adjusting motor.

[0041] When the above experimental parameters are set, the experimental start button is clicked through the touch control operation screen 18, the horizontal posture adjusting motor of the horizontal posture adjusting mechanism 8 is started first, the screw rod is driven to rotate, the rotary motion of the screw rod is synchronously converted into the linear motion of the screw nut sliding block, the hanging arm 9 is synchronously translated, and finally the three-degree-of-freedom electric mechanical hand 10 and the nozzle 6 are synchronously translated, until the distance between the nozzle 6 and the carrier plate 7 reaches the set value of the jet distance.

[0042] After 3 seconds when the spray distance adjustment is completed, the three-degree-of-freedom electric manipulator 10 is started, the adjustment of the spray angle and the orientation of the nozzle 6 is realized through the posture adjustment of the three-degree-of-freedom electric manipulator 10, until the spray attack angle of the nozzle 6 reaches the set value, at this time the nozzle 6 is just opposite to the sample in the sample setting groove 11 on the sample carrier 7.

[0043] After 3 seconds when the spray attack angle adjustment is completed, the rotary posture adjusting motor is started, the sample carrier 7 and the six samples thereon are synchronously rotated, and the rotation speed is the set value.

[0044] After 3 seconds when the rotary posture adjusting motor is started, the high-pressure pump station 4 is started, the normal-pressure water in the normal-pressure water storage tank 2 is sucked into the high-pressure pump station 4 for pressure boosting under the action of negative pressure, then the high-pressure water enters the nozzle 6, and finally the jet flow is shot to the sample surface on the sample carrier 7 by the nozzle 6, at this time the jet flow speed is the set value.

[0045] After 5 seconds when the high-pressure pump station 4 is started, the sand feeder 5 is started, the quartz sand in the sand storage tank 3 is uniformly transported into the nozzle 6 and mixed with the high-pressure water in the nozzle 6, so as to form a sand-containing fluid, so as to realize the integrated simulation of cavitation and erosion, then the sand-containing fluid will impact the sample on the sample carrier 7 at the set jet flow speed, and finally the super-high-speed spray type liquid-solid two-phase flow erosion experiment is realized, until the set experimental time is ended.

[0046] After the experimental time is ended, the high-pressure pump station 4, the sand feeder 5 and the rotary posture adjusting motor are synchronously stopped, the sand-containing fluid waste liquid generated in the experimental process has been stored in the liquid collecting tank 14, then the sand-containing fluid waste liquid in the liquid collecting tank 14 is concentrated and discharged for treatment through the liquid discharge pipe 15.

[0047] After the high-pressure pump station 4, the sand feeder 5 and the rotary posture adjusting motor are synchronously stopped, first, the protection door 12 is opened, the sample carrier 7 on which the experiment is completed is dismounted and removed from the experimental box body 1, then the six different samples are dismounted from the six sample setting grooves 11 of the sample carrier 7, then the erosion and wear condition of the sample surface can be analyzed and evaluated. After that, the empty sample carrier 7 is sent back to the experimental box body 1 and fixed to the motor shaft of the rotary posture adjusting motor again, then the protection door 12 is closed, so as to prepare for the next experiment.

[0048] The scheme in the embodiment is not used to limit the protection scope of the utility model, any equivalent implementation or change without departing from the utility model is included in the protection scope of the utility model.

Claims

1. A high-speed jet-type liquid-solid two-phase flow erosion wear experimental device, characterized in that: The experimental box, the normal-pressure water storage tank, and the sand storage tank are distributed side by side; the high-pressure pump station is arranged at the inner bottom of the experimental box, the water inlet of the high-pressure pump station is in sealed communication with the water outlet of the normal-pressure water storage tank through a normal-pressure water pipe, and the water outlet of the high-pressure pump station is in sealed communication with the water inlet of the nozzle through a pressure-resistant water pipe; the sand feeder is arranged on the inner side of the experimental box and above the high-pressure pump station, the sand inlet of the sand feeder is in sealed communication with the sand outlet of the sand storage tank through a wear-resistant hose, and the sand outlet of the sand feeder is in sealed communication with the sand inlet of the nozzle through a wear-resistant hose; the nozzle is located at the upper inner side of the experimental box; the object carrier is located at the upper inner side of the experimental box, and the object carrier and the nozzle are distributed side by side and have consistent heights.

2. The apparatus according to claim 1, wherein: The experimental box is internally provided with an onboard computer, and the onboard computer is provided with a touch-operated screen; the control ends of the high-pressure pump station and the sand feeder are electrically connected with the onboard computer.

3. The apparatus according to claim 2, wherein the apparatus is characterized in that: A horizontal posture adjusting mechanism is arranged on the inner side of the experimental box above the nozzle, and the horizontal posture adjusting mechanism comprises a horizontal posture adjusting motor, a screw rod, a screw nut sliding block, and a guide sliding seat; the horizontal posture adjusting motor is fixedly installed on the guide sliding seat, and the guide sliding seat is fixedly installed on the experimental box; the screw rod is horizontally arranged, one end of the screw rod is coaxially and fixedly connected with the motor shaft of the horizontal posture adjusting motor, and the other end of the screw rod is rotatably connected to the guide sliding seat through a bearing; the screw nut sliding block is installed between the screw rod and the guide sliding seat, and the screw nut sliding block has only a horizontal moving degree relative to the guide sliding seat; a hanging arm is vertically installed on the screw nut sliding block, and the nozzle is arranged at the bottom of the hanging arm; the control end of the horizontal posture adjusting motor is electrically connected with the onboard computer.

4. The apparatus according to claim 3, wherein the apparatus is characterized in that: A three-degree-of-freedom electric manipulator is installed between the nozzle and the hanging arm, and the nozzle serves as an end effector of the three-degree-of-freedom electric manipulator; the control end of the three-degree-of-freedom electric manipulator is electrically connected with the onboard computer.

5. The apparatus according to claim 2, wherein: A rotary posture adjusting motor is arranged between the object carrier and the experimental box, the rotary posture adjusting motor is horizontally fixedly installed on the experimental box, and the object carrier is coaxially and fixedly connected with the motor shaft of the rotary posture adjusting motor; the control end of the rotary posture adjusting motor is electrically connected with the onboard computer.

6. The apparatus according to claim 1, wherein: The object carrier is in the shape of a disc, a plurality of sample placement grooves are arranged on the object carrier, and the sample placement grooves are uniformly distributed along the circumferential direction of the object carrier.

7. The apparatus according to claim 1, wherein the apparatus is characterized in that: A protective door is arranged on the experimental box beside the nozzle and the object carrier, and a transparent window is arranged on the protective door.

8. The apparatus according to claim 1, wherein the apparatus is characterized in that: A liquid collecting tank is arranged below the nozzle and the object carrier, and a liquid discharge pipe is connected to the bottom of the liquid collecting tank.

9. The apparatus according to claim 1, wherein the apparatus is characterized in that: Supporting bolts are arranged at the four corners of the bottom of the experimental box.

10. The apparatus according to claim 1, wherein the apparatus is characterized in that: Universal casters are arranged at the bottom side of the experimental box, the bottom side of the normal-pressure water storage tank, and the bottom side of the sand storage tank.

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