Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Magnetostriction instrument

A technology of magnetostriction and test solution, which is applied to instruments, scientific instruments, measuring devices, etc., and can solve problems such as cavitation of materials that cannot be measured

Inactive Publication Date: 2006-05-03
HOHAI UNIV
View PDF0 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional magnetostrictive instrument, there is no air-entrainment device, and it is impossible to measure the effect of air-entrainment measures on reducing material cavitation

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Magnetostriction instrument
  • Magnetostriction instrument
  • Magnetostriction instrument

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The air hole plate is made of plexiglass with a thickness of 3 mm, the air hole diameter is 0.15 mm, the opening rate is 49%, and the plum blossom shape is arranged.

[0033] The vibration frequency of the magnetostrictive instrument used in this embodiment is 19.3kHz, the amplitude is 50 μm, and the power is 1000W. The test piece is OCr13Ni9Ti stainless steel, and the test solution used is water, such as figure 2 As shown, add water in the container 14 that test solution is housed in the magnetostrictive instrument of the present invention, the test piece 13 is contained in the lower end of the magnetostrictive instrument horn 12, adjusts the height of the test piece 13, makes the test piece 13 just immerse 3mm in the water, start the magnetostrictive instrument to make the test piece 13 axially vibrate at high frequency in the water. Since the vibration frequency of the magnetostrictive instrument is 19.3kHz, the amplitude is 50μm, and the power is 1000W, the vibratio...

Embodiment 2

[0037] The sample material used in this embodiment is CrMnN stainless steel that has undergone solid-liquid treatment at 1000°C + tempering heat treatment at 600°C. Test method and test condition are exactly the same as embodiment one.

[0038] According to the measured data of the test, the relationship curve between the mass loss of the test piece and the gas concentration and test time is made, see Figure 4 . The air pressures are respectively P1, P2, P3, and P4, and the aeration concentration values ​​C1<C2<C3<C4 are the same as in the first embodiment. The critical non-corrosion gas concentration value CX2 under this experimental condition can be obtained by interpolating enough times of experiments between C3 and C4.

[0039] In actual engineering, use the equipment of the same material as the test piece and operate under the same working conditions as the test conditions. As long as the aeration concentration at the contact surface between the equipment and the same ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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 í‹atmosphere-flow ratio-gas stir densityíŒ, so that it can test the cavity erosion stability with different gas-stir density.

Description

technical field [0001] The invention relates to a device for testing cavitation stability. Specifically, it is a magnetostrictive instrument. Background technique [0002] Cavitation erosion is the surface damage caused by the formation and collapse of cavitation bubbles in the liquid medium due to local pressure changes under certain ambient temperature conditions, and the material is continuously impacted by high-pressure, high-speed micro-jet. Gas turbines in thermal power plants and water machines in hydropower stations often cause partial early failure due to cavitation, resulting in reduced efficiency, reduced service life, and greatly increased equipment maintenance costs, resulting in astonishing energy and material losses. For example, the cavitation damage of the turbines in a hydropower station is serious, and it needs to be overhauled every two years. The maintenance cost of the 11 units of the plant is as high as 6.6 million yuan. It can be seen that the damag...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00G01N3/56
Inventor 吴建华严忠民骆超阮仕平
Owner HOHAI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com