CN1766548A - Magnetostriction instrument - Google Patents
Magnetostriction instrument Download PDFInfo
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- CN1766548A CN1766548A CN 200510094877 CN200510094877A CN1766548A CN 1766548 A CN1766548 A CN 1766548A CN 200510094877 CN200510094877 CN 200510094877 CN 200510094877 A CN200510094877 A CN 200510094877A CN 1766548 A CN1766548 A CN 1766548A
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Abstract
The invention relates to a magnetic deformer for testing cavity erosion stability. The device which generates high-order of oscillation makes the amplitude rod to generate shaft buffet so that the test sample of the test liquid generates cavity erosion failure. The air pump of the air-stir apparatus pumps the gas into the test liquid and uses the control valve to change the gas-stir density of the test liquid which can be obtained by exchanging the barometer reading and by the function ''atmosphere-flow ratio-gas stir density'', so that it can test the cavity erosion stability with different gas-stir density.
Description
Technical field
The present invention relates to a kind of device of testing cavitation corrosion stability.Specifically, be a kind of magnetostriction apparatus.
Background technology
Cavitation corrosion is under certain ambient temperature conditions, causes cavity to form and crumbles and fall because of local pressure changes in the liquid medium, and material is subjected to the surface breakdown that high pressure, high-speed micro-jet percussive action produce continuously.The water machines in the combustion gas turbine of fuel-burning power plant and power station etc. often cause that because of cavitation corrosion local initial failure causes efficient reduction, serviceable life to be reduced and the overhaul of the equipments expense increases greatly, cause the very surprising energy and material unaccounted-for (MUF).For example, certain power station Cavitation in Hydraulic Machinery is destroyed serious, per 2 years will overhaul once, 11 unit maintenances of full factory take up to 6,600,000 yuan.As seen the loss that causes is very serious.
Cavitation corrosion relates to material mechanical performance and flox condition, as numerous factors such as the speed of the hardness of material, anti-fatigue performance, environment liquid, pressure, is the major obstacle of industrial developments such as current shipbuilding, water conservancy project, aerospace, chemical industry.The ability that the anti-cavitation corrosion of material is degraded is represented with cavitation corrosion stability usually.The anti-cavitation corrosion performance of research material usually in two ways, a kind of is that certain material is carried out on-the-spot prototype experiment, but that test lasts is longer, also uneconomical, simultaneously because the complicacy of site environment, difficulty is bigger; Another kind is to utilize shop test equipment to carry out shop experiment, when having ready conditions its result and in-situ data is compared.Magnetostriction apparatus is the instrument of present widely used in the world test material cavitation corrosion stability, be illustrated in figure 1 as traditional magnetostriction apparatus structural representation, test specimen 13 is in the bottom of luffing bar 12, the equipment that produces the higher-order of oscillation makes luffing bar 12 axial dithers, by luffing bar 12 axial dithers, thereby make the test specimen 13 that is immersed in the container 14 that test solution is housed produce cavitation erosion, thereby the cavitation corrosion stability of test material for test.
At present, aeration extensively adopts in engineering with the method for deduction and exemption cavitation corrosion in liquid, the effect of passing through the aeration of flow-passing surface has been played really the deduction and exemption cavitation corrosions that has.But the effect of air mixing corrosion reducing is directly relevant with aeration concentrater, will not reach best corrosion inhibitor effect when aeration concentrater subcritical non-corrosion air concentration.Therefore, particularly important for the measurement of the critical non-corrosion air concentration value of various materials.But still do not have a kind of cavitation corrosion stability of energy test material under the aeration measure that install now, letting alone is to measure its critical non-corrosion air concentration value.In traditional magnetostriction apparatus, there is not the aeration device, can't measure the effect of aeration measure to deduction and exemption material cavitation corrosion.
Summary of the invention
Purpose of the present invention is exactly in order to solve the deficiency that above-mentioned traditional magnetostriction apparatus exists, provide a kind of have the aeration function can the cavitation corrosion stability of test material under the aeration measure magnetostriction apparatus.
The object of the present invention is achieved like this: a kind of magnetostriction apparatus, comprise equipment, luffing bar, the test specimen that produces the higher-order of oscillation, the container that test solution is housed, it is characterized in that: also contain aeration device and bubble generator, described aeration device is communicated with the container that test solution is housed, and described bubble generator is located at the inside of the container that test solution is housed.
Purpose of the present invention can also further realize by the following technical programs:
Aforesaid magnetostriction apparatus, wherein said aeration device is communicated with the container that test solution is housed by snorkel.
Aforesaid magnetostriction apparatus, wherein said aeration device includes air pump, operation valve, rain glass, operation valve is located at the place, outlet side that is positioned at air pump on the snorkel, and rain glass is located at the place, outlet side that is positioned at operation valve on the snorkel, and rain glass, operation valve, air pump are connected by snorkel.
Aforesaid magnetostriction apparatus, wherein said bubble generator is a spiracular plate, is provided with air hole on spiracular plate.
Aforesaid magnetostriction apparatus, being located in the container that test solution is housed of wherein said spiracular plate activity, the periphery of spiracular plate touches with the inwall that the container of test solution is housed.
Aforesaid magnetostriction apparatus, wherein said snorkel is inserted in the bottom of the container that test solution is housed.
The equipment that produces the higher-order of oscillation makes the luffing bar produce axial dither, makes the test specimen axial vibration that just is immersed in the test solution and produces cavitation erosion.The aeration device is communicated with the container that test solution is housed by snorkel, snorkel is inserted in the bottom of the container that test solution is housed, gas just can enter into the solution of submergence test specimen by snorkel, plays the aeration effect, thereby can measure the effect of aeration measure to deduction and exemption material cavitation corrosion.By changing air inflow, can further measure the cavitation corrosion stability of test specimen under the different aeration concentraters.Because the existence of bubble generator, gas is by behind the bubble generator, the size of bubble just can obtain changing, and so just can carry out the measurement of test specimen cavitation corrosion stability under different aeration concentraters, the different bubble size cases, thereby can determine the critical non-corrosion air concentration of material.
Owing to adopt above scheme, the present invention has well overcome the deficiency of original magnetostriction apparatus, can directly measure the cavitation corrosion stability of test specimen under the aeration situation, key can also be measured the cavitation corrosion stability of test specimen under different aeration concentraters and different bubble sizes, has certain practical value.
Purpose of the present invention, advantage and characteristics will illustrate and explain that these embodiment only provide as an example by the unrestricted explanation of following preferred embodiment.
Description of drawings
Fig. 1 is traditional magnetostriction apparatus structural representation
Fig. 2 is a magnetostriction apparatus structural representation of the present invention.
Fig. 3 is the test specimen loss quality of first embodiment of the invention and aeration concentrater, time chart.
Fig. 4 is the test specimen loss quality of second embodiment of the invention and aeration concentrater, time chart.
Critical piece description of reference numerals among Fig. 1, Fig. 2
11: nickel oscillator 12: luffing bar 13: test specimen 14: the container that test solution is housed
21: air pump 22: operation valve 23: rain glass 24: snorkel
25: spiracular plate 26: air hole a: chilled water
Among Fig. 3, Fig. 4:
Embodiment
Be illustrated in figure 2 as structural representation of the present invention, a kind of special magnetostriction apparatus comprises excitation supply, ultrasonic generator, nickel oscillator 11, luffing bar 12, test specimen 13, the container 14 of test solution is housed, and also contains aeration device and bubble generator.Excitation supply, ultrasonic generator, nickel oscillator 11 are formed the equipment that produces the higher-order of oscillation, and the equipment that produces the higher-order of oscillation makes luffing bar 12 produce axial dither, make the test specimen 13 that is immersed in the test solution produce cavitation erosion.The aeration device is made up of air pump 21, operation valve 22, rain glass 23, links to each other by the bottom of snorkel 24 with the container 14 that test solution is housed.The aeration device can be in the container 14 that test solution is housed aeration, make the present invention can measure the effect of aeration measure to deduction and exemption material cavitation corrosion.Pump into gas by air pump 21, the flow of operation valve 22 pilot-gas is equipped with the gas feeding in the container 14 of test solution by snorkel 24, plays the aeration effect, just can test the cavitation corrosion stability of test specimen 13 under the aeration effect.The flow of operation valve 22 adjustments of gas in the aeration device, rain glass 23 can be observed the pressure that feeds gas in the container 14 that test solution is housed, show by the adjusting of operation valve 22 and the pressure of rain glass 23, just can obtain wanting to feed the gas concentration in the container 14 that test solution is housed, the cavitation corrosion stability of test specimen 13 under the more different aeration concentraters.In the container 14 that test solution is housed, also has bubble generator, bubble generator is made up of spiracular plate 25 and air hole 26, air hole 26 has certain specification and arrangement mode, gas is through behind the bubble generator, arriving test specimen 13 controls with the vertical range of test specimen 13 by changing spiracular plate 25 with the big I of bubble of test solution surface of contact, spiracular plate 25 is big more with the vertical range of test specimen 13, and it is also big more with the bubble of test solution surface of contact to arrive test specimen 13, and vice versa.So just can measure the cavitation corrosion stability of test specimen under different aeration concentraters and the different bubble sizes, therefore the environment of better having simulated actual generation cavitation corrosion can better apply in the actual environment and go.
Embodiment one
It is the organic glass of 3mm that spiracular plate adopts thickness, air vent aperture 0.15mm, percentage of open area 49%, quincuncial arrangement.
The vibration frequency of the used magnetostriction apparatus of present embodiment is 19.3kHz, amplitude is 50 μ m, power is 1000W, test specimen is the OCr13Ni9Ti stainless steel, used test solution is a water, as shown in Figure 2, adds entry in magnetostriction apparatus of the present invention is equipped with the container 14 of test solution, test specimen 13 is contained in magnetostriction apparatus luffing bar 12 lower ends, regulate test specimen 13 height, make test specimen 13 just immerse 3mm in the water, start magnetostriction apparatus, make test specimen 13 axial dither in water, because the vibration frequency of magnetostriction apparatus is 19.3kHz, amplitude is 50 μ m, and power is 1000W, therefore test specimen 13 vibration frequencies also are 19.3kHz, and amplitude also is 50 μ m.Test period was 10h, took off test specimen 13 every 1 hour, clean earlier with acetone soln, and oven dry then, when waiting to naturally cool to room temperature, placing accuracy value is to weigh on the electronic analysis Libra of 0.1mg, writes down measurement result.Finish up to this specimen test, change an identical test specimen, start the aeration device, aeration in the container 14 that test solution is housed, adjusting control valve 22 is observed rain glass 23, and making air pressure is P1=0.001MPa, corresponding aeration bulk concentration is C1, by above-mentioned same method, the test period was 10h, took off test specimen every 1 hour under this aeration concentrater, use the same method and measure the test specimen quality, write down the result.Heavily commutation with test specimen, readjust operation valve 22, be P2=0.0015MPa at air pressure, in kind measure the mass change of test specimen during corresponding aeration concentrater C2.Again commutation with test specimen, readjust operation valve 22 again, be P3=0.002MPa at air pressure, in kind measure the mass change of test specimen during corresponding aeration concentrater C3.When operation valve 22 standard-sized sheets, air pressure P4=0.034MPa, corresponding aeration concentrater is C4, in kind measures the mass change of test specimen, the mass loss after 10 hours is 0.
Because valve opening becomes greatly gradually, air pressure P1＜P2＜P3＜P4, corresponding air concentration value C1＜C2＜C3＜C4.Aeration concentrater CN value adopts the aeration instrument to measure under the air pressure PN, can simulate the air pressure of this system and the functional relation of aeration concentrater according to many groups measurement data, thereby can directly calculate corresponding aeration concentrater with the rain glass reading.
According to the test measured data, make the relation curve of test specimen loss quality and aeration concentrater and test period, see Fig. 3.As shown in Figure 3, aeration concentrater is big more, and the unit interval, interior mass loss was more little, when reaching a certain critical value CX
1The time (C3＜CX
1≤ C4), cavitation erosion will can not take place in this test specimen, the critical non-corrosion air concentration value CX under this experiment condition
1Can obtain by the enough tests repeatedly of interpolation between C3, C4.
Embodiment two
It is the CrMnN stainless steel of handling+600 ℃ of tempering heat treatment through 1000 ℃ of solid-liquids that present embodiment adopts material for test.Test method and test condition and embodiment one are identical.
According to the test measured data, make the relation curve of test specimen loss quality and aeration concentrater and test period, see Fig. 4.Air pressure be respectively P1, P2, P3, P4, air concentration value C1＜C2＜C3＜C4 is with identical among the embodiment one.Critical non-corrosion air concentration value CX2 under this experiment condition can obtain by the enough tests repeatedly of interpolation between C3, C4.
In actual engineering, use the equipment with the test specimen same material, under the operating mode identical, move, as long as the aeration concentrater at equipment and identical test solution surface of contact place is more than or equal to critical aeration concentrater CX with test condition, can avoid cavitation erosion, thereby guarantee equipment safety operation.
By above two embodiment as can be seen, this equipment has the following advantages:
The shortcoming that to have overcome traditional magnetostriction apparatus test solution can only be liquid phase;
By the test specimen mass loss under the different aeration concentraters among same embodiment contrast, effect that can the quantitative test air mixing corrosion reducing;
The test specimen mass loss of the identical following two kinds of different materials of test condition contrast again can the quantitative test different materials anti-cavitation corrosion performance;
The test of certain number of times can draw the critical non-corrosion air concentration of material.
Above-mentioned is a kind of magnetostriction apparatus with aeration function.Except that above-mentioned example, the present invention can also have other embodiment.Equal replacement of all employings or equivalent transformation all drop in the protection domain of requirement of the present invention in the technical scheme of test specimen and test solution surface of contact aeration.
Claims (6)
1. magnetostriction apparatus, comprise equipment, luffing bar, the test specimen that produces the higher-order of oscillation, the container that test solution is housed, it is characterized in that: also contain aeration device and bubble generator, described aeration device is communicated with the container that test solution is housed, and described bubble generator is located at the inside of the container that test solution is housed.
2. magnetostriction apparatus according to claim 1 is characterized in that: described aeration device is communicated with the container that test solution is housed by snorkel.
3. magnetostriction apparatus according to claim 1, it is characterized in that: described aeration device includes air pump, operation valve, rain glass, operation valve is located at the place, outlet side that is positioned at air pump on the snorkel, rain glass is located at the place, outlet side that is positioned at operation valve on the snorkel, and rain glass, operation valve, air pump are connected by snorkel.
4. magnetostriction apparatus according to claim 1 is characterized in that: described bubble generator is a spiracular plate, is provided with air hole on spiracular plate.
5. magnetostriction apparatus according to claim 4 is characterized in that: being located in the container that test solution is housed of described spiracular plate activity, the periphery of spiracular plate touches with the inwall that the container of test solution is housed.
6. magnetostriction apparatus according to claim 2 is characterized in that: described snorkel is inserted in the bottom of the container that test solution is housed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510094877 CN1766548A (en) | 2005-10-18 | 2005-10-18 | Magnetostriction instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510094877 CN1766548A (en) | 2005-10-18 | 2005-10-18 | Magnetostriction instrument |
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|---|---|
| CN1766548A true CN1766548A (en) | 2006-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510094877 Withdrawn CN1766548A (en) | 2005-10-18 | 2005-10-18 | Magnetostriction instrument |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107421834A (en) * | 2017-05-27 | 2017-12-01 | 河海大学 | The measure apparatus and method of material cavitation property in a kind of polymer solution |
| CN111898071A (en) * | 2020-07-30 | 2020-11-06 | 江西理工大学 | Method for calculating in-path velocity of high-pressure submerged water jet |
| CN112683520A (en) * | 2020-12-08 | 2021-04-20 | 宁波市产品食品质量检验研究院(宁波市纤维检验所) | Hydraulic valve cavitation erosion test device under multiphase flow condition and test method thereof |
-
2005
- 2005-10-18 CN CN 200510094877 patent/CN1766548A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107421834A (en) * | 2017-05-27 | 2017-12-01 | 河海大学 | The measure apparatus and method of material cavitation property in a kind of polymer solution |
| CN111898071A (en) * | 2020-07-30 | 2020-11-06 | 江西理工大学 | Method for calculating in-path velocity of high-pressure submerged water jet |
| CN111898071B (en) * | 2020-07-30 | 2024-01-30 | 江西理工大学 | Calculation method for high-pressure submerged water jet flow along-distance speed |
| CN112683520A (en) * | 2020-12-08 | 2021-04-20 | 宁波市产品食品质量检验研究院(宁波市纤维检验所) | Hydraulic valve cavitation erosion test device under multiphase flow condition and test method thereof |
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