CN101825524B - Particle environment simulating system with particle motion friction electrification measurement function - Google Patents
Particle environment simulating system with particle motion friction electrification measurement function Download PDFInfo
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- CN101825524B CN101825524B CN2010101794359A CN201010179435A CN101825524B CN 101825524 B CN101825524 B CN 101825524B CN 2010101794359 A CN2010101794359 A CN 2010101794359A CN 201010179435 A CN201010179435 A CN 201010179435A CN 101825524 B CN101825524 B CN 101825524B
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Abstract
The invention relates to a particle environment simulating system, and particularly discloses a particle environment simulating system with particle motion friction electrification measurement function. The system comprises a particle environment simulating device and a particle motion friction electrification measurement device. The system constructs a simulated particle environment with adjustable air pressure and adjustable turbulence degree, can control the interaction degree of particles in the environment, and can measure the interactive electrification condition of the particles.
Description
Technical field
The present invention relates to a kind of particle environmental simulation system, more particularly, relate to a kind of particle environmental simulation system with particle movement frictional electrification measurement function.
Background technology
The particle environment is as a kind of typical Service Environment; The productive life of affect people's day by day; The micro dust particle that suspends in the air is to plant equipment, and precision optical machinery has particularly produced very big influence like the military service situation and life-span of magnetic head and magnetic card system, air bearing; Therefore, the design of plant equipment has to consider the influence of particle environment to the equipment service state with application.The static that mutual friction of motion in the particle environment between the particle produces can form very strong electrostatic field in the part, and existing research shows that the electrostatic field in the particle environment can produce serious harmful effect to high tension transmission and microwave transmission etc.But electrically charged particle and electrostatic field in the particle environment are not clear to the influence of mechanical system tribological property.
Existing simulation particle environment mainly is in wind-tunnel, to utilize high wind to form large-area simulation sand and dust environment, utilizes this simulated environment can study abrasion condition and the serviceable life of whole mechanical system in the sand and dust environment; But; Invade the variation of the friction and wear behavior that surface of friction pair causes and the variation of electromagnetic performance for the research charged particle; The simulation particle environment that then need in less cavity, form stable and controllable is with convenient research, research charged corpuscle to the influence of air bearing then require to form have a certain pressure contain the particle air-flow.Therefore; Build the adjustable simulation particle environment of air pressure, and the middle particle interaction that can control environment, the charged situation of the mutual friction of motion of measure moving particle; Tribological property to mechanical system under the research particle environment is significant, can be the mechanical system design improvement reference is provided.
Summary of the invention
In view of above-mentioned research needs; The object of the present invention is to provide a kind of particle environmental simulation system with particle movement frictional electrification measurement function; It can simulate the particle environment with certain normal pressure, different turbulence level, and can measure the charged situation of the particle in the particle environment simulator.
In order to achieve the above object, the present invention adopts following technical scheme to be achieved.
A kind of particle environmental simulation system with particle movement frictional electrification measurement function is characterized in that, comprises particle environment simulator and particle movement frictional electrification measurement mechanism; Said particle environment simulator comprise clean gas flow main pipe rail, horizontal positioned cylindric particle environmental simulation chamber, with particle environmental simulation chamber radially enter the mouth the flow-disturbing pipeline that is communicated with, the particle collection chamber that is communicated with the axial outlet in particle environmental simulation chamber, the particle supply line that is connected with the axial entrance in particle environmental simulation chamber, the main air pipe that is communicated with particle supply line level, and the particle feed mechanism of particle supply line vertical connection; The particle feed mechanism has particle chamber supply air line, and said clean gas flow main pipe rail is communicated with the particle chamber supply air line of main air pipe, flow-disturbing pipeline, particle feed mechanism respectively; Said particle movement frictional electrification measurement mechanism comprises charge amplifying circuit, and is electrically connected charge amplifying circuit and is axially disposed within the probe in the particle environmental simulation chamber.
Further improvement of the present invention and characteristics are: (1) said particle feed mechanism comprises the particle chamber, is arranged on particle funnel in the particle chamber; The upper inlet in said particle chamber is communicated with particle chamber supply air line, and following outlet is communicated with the particle supply line.
(2) said particle supply line through tee pipe fitting is communicated with main air pipe level respectively, and particle feed mechanism vertical connection; The pipe section that said tee pipe fitting is communicated with main air pipe level shrinks afterwards earlier along airintake direction and expands.
(3) said particle environmental simulation chamber axially is provided with a plurality of radially inlets, said a plurality of radially inlets that said flow-disturbing pipeline divides multichannel to be communicated with, and said a plurality of radially inlets stagger each other.
(4) the particle chamber supply air line of said main air pipe, flow-disturbing pipeline, particle feed mechanism is disposed with one-way throttle valve and pressure valve along separately airflow direction respectively.
(5) the stream end of meeting of said probe is provided with metal ball.Said charge amplifying circuit adopts the CA3140 chip to realize.
The present invention has the particle environmental simulation system of particle movement frictional electrification measurement function, has following beneficial effect: (1) can form the uniform and stable particle environment with certain normal pressure.The clean gas flow main pipe rail can be supplied stable air-flow by air compressor; The gas that the particle organization of supply is seen off-particle two-phase flow mixes; In the tee pipe fitting rectification gets into particle environmental simulation chamber, form a kind of stablizing and particle environment uniform and that have certain normal pressure.
(2) air-flow velocity, particle concentration in the particle environmental simulation chamber, turbulence level is adjustable.Air-flow velocity in the particle environmental simulation chamber can be through pressure valve on three-way connection (pipe) road (the particle feed mechanism has particle chamber supply air line, main air pipe, flow-disturbing pipeline) and one-way throttle valve control; Particle concentration is regulated the control of particle delivery rate through the funnel of changing different caliber size in the particle chamber; The turbulent air flow degree is through changing the flow-ratio control of flow-disturbing pipeline and main air pipe in the particle environmental simulation chamber.
(3) precision of particle movement frictional electrification measurement mechanism is very high.Charge amplifying circuit adopts the CA3140 chip, and this chip self bias current representative value is 10pA, the low 2-3 one magnitude of electric current that arrives than probe measurement approximately, thus guaranteed that measuring error is in 1%.
Description of drawings
Fig. 1 is a kind of structural representation with particle environmental simulation system of particle movement frictional electrification measurement function of the present invention; Fig. 2 be the particle feed mechanism partly cut open structural representation; Fig. 3 is the structural representation of tee pipe fitting; Fig. 4 is the structural representation of particle environmental simulation cavity segment; Fig. 5 is the scheme of installation of probe; Fig. 6 is the principle schematic of charge amplifying circuit; Among the figure: 1, clean gas flow main pipe rail; 2, first ball valve; 3, threeway; 4, second ball valve; 5, clean gas flow branch road; 6, particle chamber supply air line; 7, main air pipe; 8, flow-disturbing pipeline; 9, one-way throttle valve; 10, pressure valve; 11, particle feed mechanism; 1101 the 3rd ball valves; 1102 particle chambeies; 1103 lids; 1104 particle funnels; 1105 the 4th ball valves; 12 tee pipe fittings; 13 particle environmental simulation chambeies; Cavity before 1301; 1302 rear chambers; 14 particle supply lines; 15 probes; 1501 metal ball; 1502L type copper wire; 16 particle collection chambeies; 17 charge amplifying circuit; 18 data acquisition cards; 19 annular base plate; 20 lead-in wires.
Embodiment
With reference to Fig. 1, the particle environmental simulation system with particle movement frictional electrification measurement function of present embodiment comprises particle environment simulator and particle movement frictional electrification measurement mechanism two parts.
In the particle environment simulator, particle environmental simulation chamber 13 is the cylindric of horizontal positioned, and axially outlet is through the particle collection chamber 16 of flange connection, and particle collection chamber 16 is provided with axial outlet, and axially outlet is shunk gradually, obtains to contain the particle air-flow; The particle supply line 14 that the axial entrance in particle environmental simulation chamber 13 connects; Particle supply line 14 connects a horizontal port of tee pipe fitting 12; The horizontal port of another of tee pipe fitting 12 is communicated with main air pipe, and the vertical port of tee pipe fitting 12 is communicated with the outlet of particle feed mechanism 11; Particle environmental simulation chamber is provided with three radially inlets; Three radially inlet distributions vertically, and three angles that stagger that radially enter the mouth, wherein the both sides opening is upwards; Middle Open Side Down, and corresponding flow-disturbing pipeline is divided into three the tunnel through four-way and is communicated with above-mentioned three inlets radially respectively.
The clean gas flow main pipe rail is communicated with the particle chamber supply air line 6 of main air pipe 7, flow-disturbing pipeline 8, particle feed mechanism 11 respectively through four-way; The particle chamber supply air line 6 of main air pipe 7, flow-disturbing pipeline 8, particle feed mechanism 11 is disposed with one-way throttle valve 9 and pressure valve 10 along separately airflow direction respectively, can control the air-flow velocity in the particle environmental simulation chamber.The inlet of clean gas flow main pipe rail connects air compressor, and the inlet end that clean gas flow main pipe rail 1 also is provided with first ball valve, 2, the first ball valves is provided with clean gas flow branch road 5 through threeway 3, and this clean gas flow branch road 5 is provided with second ball valve 4.
The charge amplifying circuit 17 that particle movement frictional electrification measurement mechanism comprises data acquisition card 18, is electrically connected with data acquisition card 18, and the probe 15 that is axially disposed within the electrical connection charge amplifying circuit in the particle environmental simulation chamber.Probe 15 is fixed on the joint flange in particle environmental simulation chamber 13 and ion collection chamber 16, and probe 15 is positioned on the axis in particle environmental simulation chamber 13 and ion collection chamber 16.
In the particle environmental simulation system; To pass through the clean compressed air of sending into the air cleaning unit by air compressor and on clean gas flow main pipe rail 1, be divided into two-way through threeway 3; Respectively by first ball valve 2 and the 4 pilot piping foldings of second ball valve; To particle environment simulator and clean gas flow branch road 5 air-flow is provided, contains particle air-flow and clean gas flow to guarantee that this device can be exported respectively as required.The clean gas flow that provides to the particle environment simulator passes through particle chamber supply air line 6, main air pipe 7 and the flow-disturbing pipeline 8 that four-way is divided into particle feed mechanism 11, and above-mentioned three-way connection (pipe) road all has one-way throttle valve 9 and pressure valve 10 pilot piping pressure and flow size respectively.
The air-flow of the particle chamber supply air line 6 of particle feed mechanism 11 passes through particle feed mechanism 11 and forms the air-flow that contains particle, and passes through and send in the particle environmental simulation chamber 13 after tee pipe fitting 12 converges with main air pipe 7.The air-flow that the flow-disturbing pipeline provides is divided into feeding flow-disturbing air-flow in the three road direction particle environmental simulation chambeies 13 through four-way, impels particle interaction friction generates electric charge contained in the main air pipe.Regulate the flow pressure of main air pipe 7 and flow-disturbing gas circuit 8 than the turbulence level that can control air-flows in the particle environmental simulation chamber 13, thus the severe of particle interaction and influence the fricative static content of particle in the control air-flow.
The probe 15 that is arranged in 13 rear ends, particle environmental simulation chamber with come in contact through particle with air-flow; The electric charge that produces on the particle is transferred on the probe 15; Form Weak current, and be wired on the charge amplifying circuit 17, Weak current is enlarged into better measured voltage signal; And through data acquisition card 18 voltage signal is read and record, realize the measurement charged to particle.
With reference to Fig. 2, Fig. 3; The particle feed mechanism mainly comprises: particle chamber 1102; Be arranged on particle funnel 1104 in the particle chamber 1102; The upper inlet in particle chamber 1104 is provided with the 3rd ball valve 1101 and is communicated with particle chamber supply air line 6, and following outlet is provided with the 4th ball valve 1105 and is communicated with the vertical port of tee pipe fitting 12.1102 tops, particle chamber are provided with lid 1103, are used for placing particle to particle funnel 1104.Particle supply line 14 connects a horizontal port of tee pipe fitting 12, and the horizontal port of another of tee pipe fitting 12 is communicated with main air pipe 7; And the pipe section that tee pipe fitting 12 is communicated with main air pipe 7 levels shrinks afterwards earlier along airintake direction and expands.
When particle feed mechanism 11 adds particle; The 3rd ball valve 1101 and the 4th ball valve 1105 are closed; Uncap 1103; This moment, particle chamber 1102 internal pressures were atmospheric pressure, in particle funnel 1104, added quantitative particle, and particle slowly flows out particle by the aperture of opening in funnel 1104 bottoms in particle chamber 1102.Tighten lid 1103, open first ball valve 1101, supply air line 6 gets into particle chamber 1102 to pressurized air along the particle chamber, and the pressure in the particle chamber 1102 is raise; Regulate one-way throttle valve 9 and pressure valve 10 on particle chamber supply air line 6 and the main air pipe 7 respectively, can regulate the pressure dependence of particle chamber 1102 and main air pipe.Open the 4th ball valve 1105 of the 1102 times outlets in particle chamber, the mix particles that air-flow in the particle chamber 1102 and funnel 1104 flow out forms and contains the particle air-flow, gets in the tee pipe fitting 12 and mixes with main air pipe 7.The pipe section that tee pipe fitting 12 is communicated with main air pipe 7 levels is designed to shrink afterwards earlier along airintake direction to be expanded; Can go out the relative negative pressure of interruption-forming at particle chamber 1102 following; Reduction is to the pressure requirement in particle chamber 1102, and the circuit design of this shape can promote full and uniform mixing of clean gas flow in particle air-flow and the main air pipe 7 that contain in the following outlet in particle chamber 1102.
With reference to Fig. 4, Fig. 5, particle environmental simulation chamber 13 comprises the preceding cavity 1301 and rear chamber 1302 that connects through flange, is provided with rubber seal between the joint flange; Before radially inlet is positioned at three of the flow-disturbing pipeline connection on the cavity 1301.
The rear chamber 1302 in particle environmental simulation chamber 13 is connected with the flange that passes through in particle collection chamber 16, and clamping had annular base plate 19 between the flange at this place connected.Probe 15 is made up of ganoid metal ball 1501 and the L type copper wire 1502 that the surface scribbles insullac; A limit of L type copper wire 1502 is positioned on the axis in particle environmental simulation chamber 13; This stream end of meeting is provided with metal ball 1501; Its another limit is run through annular base plate 19 as extension line and is radially offered through hole, and fixedly is fixed on the annular base plate 19.The extension line of probe 15 is electrically connected charge amplifying circuit 17 and data acquisition card 18 in order.
In the said structure; The air-flow of flow-disturbing pipeline 8 through four-way be divided into three the tunnel with the preceding cavity 1301 of the vertical feeding of main air pipe 7 airflow directions in; Flow-disturbing air-flow and primary air interact, and in preceding cavity 1301, form eddy current, promote the mutual rubbing action of particle to produce static charge; Respectively through regulating one-way throttle valve 9 and pressure valve 10 on main air pipe 7 and the flow-disturbing pipeline 8 to control the throughput ratio of main tracheae stream and flow-disturbing gas circuit; The size of eddy current in the cavity 1301 before can controlling; Thereby the severe of control particle interaction is with the fricative static content of control particle.Air-flows in the preceding cavity 1301 are stable gradually in rear chamber 1304, form to contain the particle air-flow uniformly.Probe 15 is fixed on rear chamber 1304 tail ends, through with air-flow in particle contact, particle surface institute static electrification lotus is transferred on the metal ball of tips of probes.The air-flow that contains charged particle at last through the collecting chamber 16 of particle environmental simulation chamber 13 afterbodys externally output have certain normal pressure contain the particle air-flow.
With reference to Fig. 6; Charge amplifying circuit adopts the CA3140 chip to realize; The electric charge that probe 15 is gathered is connected to the negative input of CA3140 chip through the lead-in wire 20 with low noise shielding line, and the electrode input end of CA3140 chip is through resistance capacitance compensation circuit (capacitor C 1, the resistance R 1 parallel connection) ground connection of parallel connection; Its input end and negative input are provided with feedback capacity branch road (capacitor C f), and the feedback of parallel connection electricity resistance branch (resistance R _ f is connected with K switch); The CA3140 chip output obtains to represent the voltage signal Uo of the quantity of electric charge.
Claims (6)
1. the particle environmental simulation system with particle movement frictional electrification measurement function is characterized in that, comprises particle environment simulator and particle movement frictional electrification measurement mechanism;
Said particle environment simulator comprise clean gas flow main pipe rail (1), horizontal positioned cylindric particle environmental simulation chamber (13), with particle environmental simulation chamber (13) radially enter the mouth the flow-disturbing pipeline (8) that is communicated with, the particle collection chamber (16) that is communicated with the axial outlet in particle environmental simulation chamber (13), the particle supply line (14) that is connected with the axial entrance in particle environmental simulation chamber (13), the main air pipe (7) that is communicated with particle supply line (14) level, and the particle feed mechanism (11) of particle supply line (14) vertical connection; Particle feed mechanism (11) has particle chamber supply air line (6), and said clean gas flow main pipe rail is communicated with the particle chamber supply air line (6) of main air pipe (7), flow-disturbing pipeline (8), particle feed mechanism (11) respectively;
Said particle movement frictional electrification measurement mechanism comprises charge amplifying circuit, and is electrically connected charge amplifying circuit and is axially disposed within the probe (15) in the particle environmental simulation chamber (13).
2. the particle environmental simulation system with particle movement frictional electrification measurement function according to claim 1 is characterized in that said particle feed mechanism (11) comprises particle chamber (1102), is arranged on the interior particle funnel in particle chamber (1102) (1104); The upper inlet in said particle chamber is communicated with particle chamber supply air line (6), and following outlet is communicated with the particle supply line.
3. the particle environmental simulation system with particle movement frictional electrification measurement function according to claim 1; It is characterized in that, said particle supply line (14) through tee pipe fitting is communicated with main air pipe (7) level respectively, and particle feed mechanism (11) vertical connection; The pipe section that said tee pipe fitting is communicated with main air pipe (7) level shrinks afterwards earlier along airintake direction and expands.
4. the particle environmental simulation system with particle movement frictional electrification measurement function according to claim 1; It is characterized in that; Said particle environmental simulation chamber (13) axially is provided with a plurality of radially inlets; Said a plurality of radially inlets that said flow-disturbing pipeline (8) divides multichannel to be communicated with, said a plurality of radially inlets stagger each other.
5. the particle environmental simulation system with particle movement frictional electrification measurement function according to claim 1; It is characterized in that the particle chamber supply air line (6) of said main air pipe (7), flow-disturbing pipeline (8), particle feed mechanism (11) edge airflow direction separately respectively is disposed with one-way throttle valve (9) and pressure valve (10).
6. the particle environmental simulation system with particle movement frictional electrification measurement function according to claim 1 is characterized in that, the stream end of meeting of said probe (15) is provided with metal ball (1501).
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| CN2010101794359A CN101825524B (en) | 2010-05-21 | 2010-05-21 | Particle environment simulating system with particle motion friction electrification measurement function |
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| CN106950438B (en) * | 2017-04-28 | 2023-06-02 | 中国科学院地球化学研究所 | Non-contact space particle charged detection device and method |
| CN111665014B (en) * | 2020-05-20 | 2022-02-22 | 中国科学院力学研究所 | Hypersonic aircraft boundary layer electron density diagnostic system based on high-frequency electrostatic probe |
| CN114295643B (en) * | 2021-12-31 | 2023-06-30 | 中国建筑材料科学研究总院有限公司 | System and method for testing dynamic wave absorbing performance of interference material |
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| JP3834630B2 (en) * | 2002-10-09 | 2006-10-18 | 独立行政法人物質・材料研究機構 | Real environment simulated atmospheric corrosion test equipment |
| JP2006258506A (en) * | 2005-03-15 | 2006-09-28 | National Institute For Materials Science | Actual environment simulating atmospheric corrosion test device and actual environment simulating atmospheric corrosion test method using the same device |
| CN101539498B (en) * | 2009-04-16 | 2011-06-01 | 西安交通大学 | Magnetic head and magnetic card frictional wear experimental device |
| CN201697796U (en) * | 2010-05-21 | 2011-01-05 | 西安交通大学 | Particle environment simulation system with particle movement frictional electrification measurement function |
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