CN114910375B - Ultra-high flow velocity impeller mechanical erosion abrasion performance experimental device - Google Patents
Ultra-high flow velocity impeller mechanical erosion abrasion performance experimental device Download PDFInfo
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- 238000005299 abrasion Methods 0.000 title claims abstract description 33
- 230000003628 erosive effect Effects 0.000 title claims abstract description 29
- 238000005260 corrosion Methods 0.000 claims abstract description 35
- 230000007797 corrosion Effects 0.000 claims abstract description 30
- 238000005485 electric heating Methods 0.000 claims abstract description 30
- 238000002474 experimental method Methods 0.000 claims abstract description 28
- 229910001338 liquidmetal Inorganic materials 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 26
- 239000010935 stainless steel Substances 0.000 claims description 23
- 229910001220 stainless steel Inorganic materials 0.000 claims description 23
- 239000012530 fluid Substances 0.000 claims description 19
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 15
- 229910052760 oxygen Inorganic materials 0.000 claims description 15
- 239000001301 oxygen Substances 0.000 claims description 15
- 239000007789 gas Substances 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 23
- 239000013049 sediment Substances 0.000 abstract description 11
- 238000013461 design Methods 0.000 abstract description 5
- 230000004927 fusion Effects 0.000 abstract description 4
- 230000007246 mechanism Effects 0.000 abstract description 3
- 238000005086 pumping Methods 0.000 abstract 1
- 239000004576 sand Substances 0.000 description 10
- 238000012360 testing method Methods 0.000 description 8
- 230000008439 repair process Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 2
- 229910013856 LiPb Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
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- 230000006866 deterioration Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000003028 elevating effect Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000003760 magnetic stirring Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- 206010061619 Deformity Diseases 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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- 238000005096 rolling process Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
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- 239000010959 steel Substances 0.000 description 1
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- 238000003860 storage Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/56—Investigating resistance to wear or abrasion
- G01N3/567—Investigating resistance to wear or abrasion by submitting the specimen to the action of a fluid or of a fluidised material, e.g. cavitation, jet abrasion
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- General Physics & Mathematics (AREA)
- Biodiversity & Conservation Biology (AREA)
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Abstract
The invention provides an ultra-high flow rate impeller mechanical erosion abrasion performance experiment device which comprises an experiment device main body and an electric heating furnace. The experimental device main body comprises a main tank body, an air path system and a lifting rotating system. The electric heating furnace comprises a positioning device, a resistance wire heating system and a thermocouple temperature measuring system. The main tank body at the bottom of the main body of the experimental device is placed on the electric heating furnace and is fastened by the clamp inside the furnace body. The air circuit system is connected with external air pumping and supplying equipment, and the high-rotation-speed motor and the main shaft of the device are integrally designed. According to the relative motion principle, after being corroded by liquid metal, the sample in the sample fixing frame can be taken out to analyze the corrosion mechanism. The invention has novel structure and low cost, meets the harsh standard of high-flow-rate, high-temperature and strong-corrosion liquid metal, can be used for helping to design commercial fusion reactor nuclear main pumps, is also suitable for carrying out experiments with lower standard such as yellow river basin sediment erosion and water turbine blade abrasion, and provides a data foundation for the same.
Description
Technical Field
The invention belongs to the field of research on erosion and abrasion mechanisms in fluids such as liquid metal and the like, and particularly relates to an ultra-high flow rate impeller mechanical erosion and abrasion performance experimental device.
Background
With the rapid development of global industry and continuous progress of society, phenomena such as energy shortage, global warming, serious environmental pollution and the like are increasingly developed, so that the environment of human life is gradually worsened, the world is brought into environmental crisis, and the terrorist signals bring importance and disfigurement to the environment protection of human beings. In order to alleviate the increasingly serious environmental crisis, in addition to environmental protection and sanitation, clean energy sources that can replace traditional petrochemical resources must be found to suppress the continued deterioration of the environment. Thus, there is an urgent need to develop clean energy that is pollution-free and renewable.
The water resources of China are rich, and the water and electricity development prospect is good. However, because of the large sediment content of many rivers, 38% of the sediment of the units in one hundred large and medium-sized hydropower stations which are operated at present are severely worn and cavitation corroded. The water is less and more, the water and sand are heterogeneous, and the water and sand relationship is not coordinated, which is the outstanding characteristic of the water resource of the yellow river basin. The average natural runoff of the river basin for many years is 535 hundred million cubic meters, the average sand conveying amount for many years is 12.47 hundred million tons, and the river basin is the river with the largest sand conveying amount in the world. The water above Lanzhou accounts for 62% of the yellow river, and is the main yielding zone of the yellow river; the water amount from the estuary town to the gantry is 9% of the yellow river, the sand amount is about 54% of the yellow river, and the estuary town to the gantry is the main sand producing area of the yellow river. The yellow river sediment also has the characteristics of fine particles, edges and corners, high hard mineral content and the like. This results in very severe erosion of the hydroelectric turbines in the yellow river basin. Due to serious cavitation erosion and sediment abrasion, the water is forced to be abandoned and protected in the flood season, and the number and frequency of overhaul of the over-current components such as the blades of the water turbine are increased, so that great economic loss and energy waste are caused. Taking a 225kW unit as an example, the maintenance period is 110 days, all the generators and the upper structure of the water turbine are required to be removed, the rotating wheel is lifted out for repair, and the disassembly and assembly workload is very large; and the polishing and repair welding conditions of the rotating wheel and the overcurrent component are hard, and more than ten tons of stainless steel welding rods are consumed. And according to the calculation of 0.2 yuan per degree of electricity, the production value 11880 ten thousand yuan can be reduced by one unit during major repair due to less power generation. In addition, the sediment is worn and eroded to destroy, and the sediment abrades the hydraulic turbine to harm much, such as greatly reducing the water energy efficiency, the volumetric efficiency and the mechanical efficiency, causing the unit efficiency to be reduced and the annual energy production to be reduced sharply; the vibration of the water turbine unit is aggravated, the shutdown time is prolonged, the water leakage is serious, and the safe operation of the water turbine unit is directly threatened.
In recent years, a great deal of laboratory and field test researches on the mechanism of abrasion of the muddy sand, the abrasion resistance of various metal and nonmetal abrasion-resistant materials, various technical measures for preventing the muddy sand abrasion of the water turbine and the like have been carried out at home and abroad, and a great deal of results are obtained. Some hydropower stations on yellow river in China also accumulate successful experience in repair welding repair of the rotating wheel, re-coating of nonmetallic materials of the rotating wheel blade for resisting the abrasion of silt, and the like. However, the problems in the field of the abrasion of the muddy sand of the water turbine are still large and need to be further studied.
The controlled nuclear fusion has the outstanding advantages of cleanness, safety, abundant reserves, high output energy and the like, and is one of the main ways for solving the current social energy crisis at present. There are also some unavoidable problems with liquid metals (e.g., liPb, pbBi, pb, na, etc.) as reactor coolant, one of which is corrosion problems with the structural materials, which, in the case of flow, can erode and dissolve. The original oxide film is peeled off to cause the substrate to be directly contacted with liquid metal, so that the substrate material is damaged. Particularly, the service life of the nuclear main pump is greatly reduced due to serious corrosion injury to the nuclear main pump of a loop, and serious consequences and economic loss can be caused by sudden accidents.
The device is found to be capable of simulating the erosion and abrasion influence of sediment on the hydraulic machinery, the influence of high-speed flow of liquid metal on the corrosion behavior of structural materials, and the experimental research of developing various mediums such as water corrosion, sediment erosion concrete, steel structure bridges and the like in yellow river basin on the erosion, abrasion and corrosion of matrix materials is of great significance.
Disclosure of Invention
Considering that the magnetic stirring rotor of the traditional magnetic stirring device has larger friction with the container when rotating, so that the rotating speeds of the upper rotor and the lower rotor are not matched, larger error is caused to the experiment, and the traditional magnetic driving device does not meet the requirements of severe environment of corrosion experiment and longer experiment period due to rotor abrasion; considering that the traditional experimental device adopts a fixing method of winding a metal wire with a corrosion material, the time and the labor are wasted, the metal wire for fixing is easy to fuse at high temperature, high pressure and high flow rate, and the problem that a sample is not firmly fixed and is separated from a sample fixing frame exists; considering that solid liquid metal (such as LiPb, pbBi, pb, na and the like) needs to be heated and melted into liquid in an external container and then poured into a liquid storage tank after rolling when an experiment is carried out by a traditional device, the experimental literacy requirement on experimenters is extremely high, meanwhile, the experiment becomes dangerous and difficult to operate, and the experiment precision is influenced because the liquid metal (such as LiPb, pbBi, pb, na and the like) is exposed to air for oxidation and deterioration, the real corrosion condition inside a nuclear main pump cannot be simulated, the invention aims to solve the problems that the rotation speed is not matched, the sample taking and placing are time and labor consuming and the danger coefficient is high and the main shaft of the device is not liftable when the traditional device is used for stirring.
In order to achieve the above purpose, the invention adopts the following technical scheme:
an ultra-high flow rate impeller mechanical erosion abrasion performance experimental device comprises an experimental device main body and an electric heating furnace; the experimental device main body comprises an air path system and a lifting rotating system; the lifting rotating system consists of a motor, a motor base, a lifting device base, a stainless steel threaded pipe and a lifting device stud; the electric heating furnace comprises an electric heating furnace wall, an electric heating furnace body and pulleys;
The lifting rotating system is connected with a motor main shaft through a motor, and the motor main shaft penetrates through the motor base, the lifting device base and the main tank cover in sequence and is integrally connected with a shaft of a stirrer in the main tank body below; the stainless steel threaded pipe is sleeved in the middle of the motor spindle and is used for bearing the lifting device base and the main tank cover at the bottom together with the lifting device studs at the periphery; the stainless steel threaded pipe is matched with the lifting device stud, and the lifting of the experimental device is realized by changing the screwing depth of the threads;
The inner side of the electric heating furnace body is provided with a heating resistance wire and a thermocouple, the heating resistance wire and the thermocouple are used for heating and controlling the temperature of liquid metal in the main tank body, the main tank body is fastened by a clamp on the inner wall of the electric heating furnace body, and a pulley is arranged below the electric heating furnace body, so that the electric heating furnace is convenient to move; an air path system interface is arranged between the main tank body and the main body of the experimental device, and is connected with an external vacuum pump for vacuumizing before experiments; the oxygen concentration sensor is used for displaying the oxygen content in the tank.
Further, the gas circuit system comprises a pressure release valve, an oxygen concentration sensor and a gas circuit system interface.
Further, the oxygen concentration sensor is arranged above the main tank cover and used for detecting the oxygen concentration content in the main tank body, and a pressure gauge and a pressure relief valve are arranged on an air path system interface pipeline extending from the upper side of the main tank cover and used for measuring and changing the pressure in the main tank body.
Further, a sample holder is located at the end of the motor spindle surrounding the stirrer.
Further, the experimental device adopts one or a combination of silicon carbide, metal ceramic and high-temperature resistant alloy as a manufacturing material.
Further, the main tank body is a cylindrical container capable of containing high-temperature, high-pressure and strong-corrosion fluid.
Further, the experimental device main body is connected with the main tank body through a flange, the inside of the experimental device main body is sealed by means of a copper metal sealing ring, and the stainless steel threaded pipe and the lifting device stud support the lifting device base above and the main tank cover below.
Further, a trapezoid sample fixing groove is formed in the circumference of the sample fixing frame, and in the experiment, corrosion-resistant materials with similar sizes and shapes are plugged into the sample fixing groove, and the sample is firmly fixed by using the fastening bolt to assist in fastening the gasket.
The beneficial effects are that:
The ultra-high flow rate impeller mechanical erosion abrasion performance experimental device provided by the invention realizes the height adjustment of the rotating part by utilizing the deformation of the stainless steel threaded pipe, so that the device is simpler and more convenient to manufacture and maintain. The device is convenient to operate, and the motor with adjustable rotating speed can create a fluid environment with high flow rate to carry out corrosion experiments; meanwhile, the construction cost of the device is greatly reduced, and a related lifting motor is not required to be additionally added. The lifting integrated design perfectly avoids the problem of mismatching of the rotating speed of the traditional magnetic rotation; the sample fixing groove which can bear the corrosion-resistant experimental material is machined on the container wall to replace the traditional fixing method of binding the corrosion-resistant material by using iron wires, and the mortise-tenon structure is utilized to facilitate the taking of samples; the invention can accurately test the corrosion resistance of the structural material under the synergistic effect of liquid metal corrosion and erosion, and accurately embody the corrosion resistance index of the structural material. The corrosion experiment of various fluids on materials under the working conditions of different temperatures, pressures and flow rates can be carried out.
The invention simulates the structural material corrosion experiment under the flowing condition of sediment-containing water, can accurately test the performance of the structural material under the effects of medium erosion and abrasion, and further improves the operation safety, stability and economy of the water turbine generator set. In addition, the liquid metal corrosion experiment performed by the device has important significance for further determining the operation parameters of the commercial fusion reactor and prolonging the service life of the fusion reactor structural material in future, and can provide reference for the design of the liquid metal nuclear main pump corrosion experiment device at home and abroad in future. The experimental data obtained by the impeller machinery manufacturer can be used for designing more reasonable schemes for a steam turbine and the like, and improving the service life of the hydraulic machinery working in sand-containing water flow. The experimental conditions of the liquid metal rotary corrosion experiment are high-temperature, ultrahigh-flow-rate and strong-corrosion environments, and the requirements on experimental equipment are highest, so that the experimental device is used for simulating the liquid metal corrosion experiment and is also suitable for environments with lower experimental requirements such as sediment erosion and abrasion water turbines.
Drawings
FIG. 1 is a schematic diagram of a main body of an ultra-high flow rate impeller mechanical erosion abrasion performance experimental device;
FIG. 2 is a schematic diagram of an ultra-high flow rate impeller mechanical erosion abrasion performance experimental device (excluding an electric heating furnace) of the invention;
FIG. 3 is a schematic diagram of an electric heating furnace of an ultra-high flow rate impeller mechanical erosion abrasion performance experimental device of the invention;
FIG. 4 is a schematic view of a sample holder of an ultra-high flow rate impeller mechanical erosion abrasion performance experimental device according to the present invention.
The reference numerals in fig. 1-2 have the meaning: 1 is a pressure gauge, 2 is a motor, 3 is a motor base, 4 is a lifting device base, 5 is a stainless steel threaded pipe, 6 is a lifting device stud, 7 is a temperature sensor, 8 is a main tank body, 9 is a pressure release valve, 10 is an oxygen concentration sensor, 11 is an air circuit system interface, 15 is a motor spindle, 16 is a sample fixing frame fixing pipe, 17 is a main tank cover, 18 is a sample fixing frame, and 19 is a stirrer.
The reference numerals in fig. 3 mean: 12 is the wall of the electric heating furnace, 13 is the furnace body of the electric heating furnace, 14 is a pulley,
The reference numerals in fig. 4 mean: 20 are fastening bolts, 21 are fastening gaskets, 22 are bolt holes, and 23 are sample fixing grooves.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
As shown in figures 1-3, the ultra-high flow rate impeller mechanical erosion abrasion performance experimental device comprises an experimental device main body and an electric heating furnace. The experimental device main body comprises an air path system and a lifting rotating system. The gas circuit system comprises a pressure gauge 1, a temperature sensor 7, a pressure relief valve 9, an oxygen concentration sensor 10 and a gas circuit system interface 11; the lifting and rotating system consists of a motor 2, a motor base 3, a lifting device base 4, a stainless steel threaded pipe 5 and a lifting device stud 6; the electric heating furnace comprises an electric heating furnace wall 12, an electric heating furnace body 13 and a pulley 14 at the bottom. The experimental device adopts one or a combination of silicon carbide, metal ceramic and high-temperature resistant alloy as a manufacturing material, and can be specifically made of 304 stainless steel. The lifting and rotating system is integrally connected with the shaft of the stirrer 19 in the main tank body 8 below after the motor main shaft 15 sequentially passes through the motor base 3, the lifting device base 4 and the main tank cover 17. The shaft periphery of the stirrer 19 is connected with the lifting device base 4 and the main tank cover 17 at the bottom through the stainless steel threaded pipe 5, and the lifting device stud 6 and the stainless steel threaded pipe 5 are in threaded screwing depth change, so that the lifting design of the experimental device is realized. The gas circuit system is characterized in that a gas circuit system interface 11 is arranged at the top of a main tank cover 17, and a pressure relief valve 9, a pressure gauge 1 and an oxygen concentration sensor 10 are connected in the gas circuit system interface 11. The inner side of the electric heating furnace body 13 is provided with a heating resistance wire and a thermocouple for heating and controlling the temperature of the liquid metal in the main tank body 8, the main tank body 8 is fastened by a clamp on the inner wall of the electric heating furnace body 13, and a pulley 14 is arranged below the electric heating furnace. An air circuit system interface 11 is arranged between the main tank body 8 and the main body of the experimental device and is connected with an external vacuum pump for vacuumizing before experiments. The pressure gauge 1 is used to display the pressure in the main tank 8. In the experiment, if the pressure in the main tank body 8 is too high, the pressure relief valve 9 is opened for pressure relief. The oxygen concentration sensor 10 is used to display the oxygen content in the tank. The experimental device main body is in flange connection with the main tank body 8, the inside is sealed by means of a copper metal sealing ring, and the lifting device stud 6 supports the lifting device base 4 at the upper part of the experimental device main body and the main tank cover 17 at the lower part. The main tank body 8 is a cylindrical container capable of containing high-temperature, high-pressure and strong-corrosion fluid.
Wherein, the motor 2 with adjustable rotation speed is arranged at the uppermost part of the experimental device main body, and the motor main shaft 15 extends out of the motor base 3. The middle part of the main body of the experimental device is provided with a lifting and rotating system capable of adjusting the heights of the sample fixing frame 18 and the stirrer 19 in the main tank body 8, and the lifting and rotating system comprises a stainless steel threaded pipe 5, a lifting device stud 6 and a sample fixing frame fixing pipe 16. The experimental device is penetrated by the motor spindle 15 from top to bottom in sequence. Wherein, the motor main shaft 15 is located the innermost of the mid portion of experimental apparatus main body, and its upper end is connected elevating gear base 4, and agitator 19 is connected to the lower extreme, and sample mount fixed pipe 16 overlaps in motor main shaft 15 outside, and elevating gear base 4 is connected to its upper end, and sample mount 18 is connected to the lower extreme. At the outermost side of the middle part of the experimental device body is a stainless steel threaded tube 5 which is sleeved outside a sample fixing frame fixing tube 16. The upper end of the stainless steel threaded pipe 5 is connected with the lifting device base 4, and the lower end is connected with the main tank cover 17. The lowest part of the main body of the experimental device is connected with a main tank cover 17 through a sample fixing frame fixing pipe 16 and a stainless steel threaded pipe 5 and is mainly used for sealing. Placing fluid into the main tank body 8, opening the gas circuit system interface 11, and externally connecting an air extractor to vacuumize the main tank body 8; due to the integrated design of the experimental device, the motor 2 can drive the motor main shaft 15 to rotate at a high speed, and a high-flow-rate environment of the fluid in the tank is created for corrosion experiments.
In experiments, as shown in fig. 4, 2 identical sample fixing grooves 23 with the shape of 10cm multiplied by 14cm multiplied by 10cm are arranged on the inner wall of the circumference of the sample fixing frame 18 with the wall thickness of 1.2cm and the height of 9cm, and materials with the shape of similar sizes are only needed to be plugged into the sample fixing grooves 23, so that the samples are positioned by using a mortise-tenon type structure. Bolt holes 22 are designed on the cross-section wall above the sample fixing frame 18, and when the experimental sample is placed, the fastening bolt 20 is used for assisting in fastening the gasket 21, and axial pressure is applied to the experimental sample, so that the sample can be firmly fixed, and one surface of the sample is exposed to fluid. When the experiment starts, the motor 2 drives the stirrer 19 to rotate, the stirrer 19 drives the fluid to rotate, the flow rate of the fluid flowing through the corrosion-resistant material can be calculated according to the relative motion principle, and the rotating speed of the motor 2 is regulated so as to change the flow rate of the fluid flowing through the corrosion-resistant material, so that a plurality of groups of different experiment results are obtained. Time and experiment cost are saved.
The stainless steel threaded pipe 5 at the outer layer of the motor main shaft 15 is used for realizing the expansion and the contraction, and the height of the stroke of 110mm can be adjusted. The experimental device is simpler and more convenient to manufacture and maintain, is convenient to operate, and simultaneously greatly reduces the construction cost. The main tank cover 17 is driven to move up and down by the expansion and contraction of the stainless steel threaded pipe 5, and the stirrer 19 drives the fluid to rotate, so that tangential scouring corrosion of the test sample and the fluid is formed. The stainless steel threaded tube 5, due to its unique corrugated structure, has the main function of taking up the pressure from the connecting rod parallel to the motor. The flange type connection is adopted, and a small amount of manual operation is adopted in the experiment, so that the connection can be completed in a short time, and the connection is quick and convenient. The stainless steel threaded pipe 5 can drive the main tank cover 17 to slide on the motor main shaft 15 by adjusting the screwing length, so that the length between the sample fixing frame 18 and the stirrer 19, which are away from the main tank cover 17, is changed, and experimental data of experimental samples on the sample fixing frame 18 under different depth working conditions in the main tank body 8 can be conveniently simulated.
The motor 2 drives the stirrer 19 to rotate, the stirrer 19 drives the fluid to rotate, the rotating speed of the motor 2 is adjusted so as to change the flow speed of the fluid flowing through the corrosion-resistant material, the phenomenon that the traditional magnetic force driving rotating speed is not matched is avoided, and experimental results under the condition of different flow speeds of the fluids in the multiple groups of main tank bodies 8 can be conveniently obtained. The stainless steel threaded pipe 5 can drive the main tank cover 17 to slide on the motor main shaft 15 by adjusting the screwing length of the threads, so that different positions of the corrosion test materials in the liquid metal fluid are changed, and the test results under the condition of different fluid depths in the multi-group main tank body 8 are obtained. The sample fixing groove 23 which can bear the corrosion test material is processed on the sample fixing frame 18 to replace the traditional fixing method of the iron wire binding material, so that the test sample can be conveniently taken.
The above description of the embodiments is only for aiding those skilled in the art in understanding the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various changes and modifications can be made herein without departing from the principles of the invention, which are also intended to fall within the scope of the appended claims.
Portions not described in detail herein are well known in the art. Various modifications to the present embodiment will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. An ultra-high flow rate impeller mechanical erosion abrasion performance experimental device is characterized in that: comprises an experimental device main body and an electric heating furnace; the experimental device main body comprises an air path system and a lifting rotating system; the lifting rotating system consists of a motor (2), a motor base (3), a lifting device base (4), a stainless steel threaded pipe (5) and a lifting device stud (6); the electric heating furnace comprises an electric heating furnace wall (12), an electric heating furnace body (13) and pulleys (14);
The lifting rotating system is connected with a motor main shaft (15) through a motor (2), and the motor main shaft (15) sequentially penetrates through the motor base (3), the lifting device base (4) and the main tank cover (17) and is integrally connected with a shaft of a stirrer (19) in the main tank body (8) below; the stainless steel threaded pipe (5) is sleeved in the middle of the motor spindle (15) and is used for bearing the lifting device base (4) and the main tank cover (17) at the bottom together with the lifting device studs (6) at the periphery; the stainless steel threaded pipe (5) is matched with the lifting device stud (6) to realize the lifting of the experimental device by changing the screwing depth of the threads;
The inner side of the electric heating furnace body (13) is provided with a heating resistance wire and a thermocouple, the heating resistance wire and the thermocouple are used for heating and controlling the temperature of liquid metal in the main tank body (8), the main tank body (8) is fastened by a clamp on the inner wall of the electric heating furnace body (13), and a pulley (14) is arranged below the electric heating furnace, so that the electric heating furnace is convenient to move; an air circuit system interface (11) is arranged between the main tank body (8) and the main body of the experimental device, and is connected with an external vacuum pump for vacuumizing before experiments; an oxygen concentration sensor (10) is used to display the oxygen content in the tank.
2. The ultra-high flow rate impeller mechanical erosion abrasion performance experimental device according to claim 1, wherein: the gas circuit system comprises a pressure release valve (9), an oxygen concentration sensor (10) and a gas circuit system interface (11).
3. The ultra-high flow rate impeller mechanical erosion abrasion performance experimental device according to claim 2, wherein: the oxygen concentration sensor (10) is arranged above the main tank cover (17) and is used for detecting the oxygen concentration content in the main tank body (8), and a pressure gauge (1) and a pressure relief valve (9) are arranged on a pipeline of the gas circuit system interface (11) extending from the upper part of the main tank cover (17) and are used for measuring and changing the pressure in the main tank body (8).
4. The ultra-high flow rate impeller mechanical erosion abrasion performance experimental device according to claim 1, wherein: a sample holder (18) is located at the end of the motor spindle (15) surrounding the stirrer (19).
5. The ultra-high flow rate impeller mechanical erosion abrasion performance experimental device according to claim 1, wherein: the experimental device adopts one or a combination of silicon carbide, metal ceramic and high-temperature resistant alloy as a manufacturing material.
6. The ultra-high flow rate impeller mechanical erosion abrasion performance experimental device according to claim 1, wherein: the main tank body (8) is a cylindrical container capable of containing high-temperature, high-pressure and strong-corrosion fluid.
7. The ultra-high flow rate impeller mechanical erosion abrasion performance experimental device according to claim 1, wherein: the experimental device is characterized in that the experimental device main body is in sealing connection with the main tank body (8), and the stainless steel threaded pipe (5) and the lifting device stud (6) support the lifting device base (4) above and the main tank cover (17) below.
8. The ultra-high flow rate impeller mechanical erosion abrasion performance experimental device according to claim 1, wherein: a sample fixing groove (23) is arranged on the circumference of the sample fixing frame (18), and in the experiment, corrosion-resistant materials with similar sizes and shapes are plugged into the sample fixing groove (23) for fixing.
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