CN102052943B - Device for testing partial charge-to-mass ratio of fogging space in electrostatic spraying - Google Patents
Device for testing partial charge-to-mass ratio of fogging space in electrostatic spraying Download PDFInfo
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- CN102052943B CN102052943B CN2010105712108A CN201010571210A CN102052943B CN 102052943 B CN102052943 B CN 102052943B CN 2010105712108 A CN2010105712108 A CN 2010105712108A CN 201010571210 A CN201010571210 A CN 201010571210A CN 102052943 B CN102052943 B CN 102052943B
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Abstract
The invention discloses a device for testing the partial charge-to-mass ratio of a fogging space in electrostatic spraying. An insulating disk provided with a plurality of concentric circular grooves is arranged at the lower part of a nozzle, the center of the disk is level to the center of the nozzle, the circular grooves on the disk are used for receiving charge fogdrips and metering the flux of the fogdrips dropped in each circular groove; and the bottom of each circular groove is respectively provided with a metal net which is connected with a precise microammeter and used for measuring the current I released by electrified fogdrips dropped in each circular groove, thereby obtaining the charge-to-mass ratio of fogdrips in all the circular grooves. All the circular grooves are concentric and are at different radial positions on the disk, and therefore, the charge-to-mass ratio of the fogdrips in each circular groove can be approximately used as the charge-to-mass ratio at the radial position and the charge-to-mass ratio of all the circular grooves disclose the distribution rule of the charge-to-mass ratio of the fogdrips. Through the vertical moving of the disk on an upright column, the distribution of charge-to-mass ratios at different vertical distance from the nozzle can be obtained.
Description
Technical field
The present invention relates to a kind of electrostatic spray testing apparatus, particularly relate to a kind of device of testing the local specific charge of atomization space in the electrostatic spray.
Background technology
Under the effect of electrostatic field; The process that hydrofluidic is broken into droplet is called electrostatic spray; Compare with other atomization techniques (like pressure atomization, centrifugal atomizing etc.), electrostatic spray has many advantages,, even size distribution little like the droplet yardstick; And can necessarily regulate and control etc. the atomizing flow field through regulating electrical quantity (as applying voltage), so in fuel-oil atmozation burning, industrial spraying, pesticide spraying, material preparation (like ceramic membrane and porous medium film etc.), be used widely.In the application of electrostatic spray, the charged effect of droplet is extremely crucial, and it not only is directly connected to the atomizing effect of liquid, and is the key parameter of electrostatic charged spray Two-Phase Flow Field theoretical modeling.The charged effect of droplet generally adopts specific charge (electric weight that the unit mass drop is entrained) or lotus to amass and weighs than (the entrained electric weight of unit volume droplet).Present method of testing is to adopt netted goal method or Faraday cylinder method that the specific charge of the overall droplet of spray process is tested; Charged droplets gatherer and current detecting instrument that wherein netted goal method measurement mechanism is made up of wire netting and metal conically shaped are formed; During use gatherer one is rectified nozzle, all charged droplets are collected the device collection like this, and the electric weight of charged droplets is transferred on the gatherer; Through discharging to the earth after the current detecting instrument; Measure the droplet quality m (with graduated cylinder and balance) that gets into gatherer in the unit interval, the current detecting instrument is measured whole droplet release current I of institute, so just can obtain the specific charge q of all droplets
m(q
m=I/m, m is the quality that sprays into droplet in the gatherer in the unit interval here).The Faraday cylinder method is made up of two metallic cylinder and corresponding measurement instruments that are sleeved on together again mutually insulated.The whole charged droplets that when urceolus ground connection, feasible spraying, produce fall into inner core; Because electrostatic induction; Interior tube outer surface has the equivalent charges of different polarity respectively with outer tube inner surface, so have potential difference (PD) U and capacitor C between the inner/outer tube, measures potential difference (PD) U and capacitor C; Can obtain all charge specieses in the inner core (being charged droplets) with total electric weight q (q=CU), specific charge q then
mJust can confirm (q
m=q/M, M is the quality that falls into all droplets in the inner core here).The above-mentioned two kinds of methods used at present and device all are the electric weight of whole droplets of spray process and quality to be detected obtain specific charge, the overall charged situation of charged droplets in the just spray process of its reaction.In fact; Because the yardstick of all droplets, speed and carried charge are different; And the entrained electric weight of droplet is decay in time also; Therefore, be different in the specific charge of the droplet of different atomization space (apart from nozzle different distance place and different radial positions place), the device and method of existing test specific charge can not react the otherness of the local specific charge at this different spatial place.
Summary of the invention
Can not test local this deficiency of specific charge of atomization space in the electrostatic spray in order to overcome existing specific charge (or the long-pending ratio of lotus) method of testing and device; The object of the present invention is to provide a kind of test that can realize the local specific charge of atomization space, and and then obtain the droplet specific charge along the axial proving installation that reaches the regularity of distribution radially of atomizing.
For realizing above-mentioned purpose, technical solution of the present invention is:
The present invention is a kind of device of testing the local specific charge of atomization space in the electrostatic spray, and proving installation is installed in the below of nozzle, is used to hold receive liquid from nozzle ejection back formation charged droplets; Described proving installation mainly is made up of disk, wire netting, micro-flowmeter, accurate microampere meter, frame that insulating material is made; Described disk is unsettled to be installed on the frame and disc centre is alignd with nozzle center; On disk, be processed with some annular concentric grooves; Wire netting is laid in bottom at every ring annular groove; The wire netting that is positioned at the ring groove bottom is connected and ground connection with accurate microampere meter, all offers an aperture in the bottom of every ring annular groove, connects micro-flowmeter or glass cylinder in the exit of aperture.
Described frame is made up of connecting link, sliding sleeve, holding screw, column, base; The lower end of described column is fixed on the base and upwards and vertically holds up; One side of described disk is connected with sliding sleeve through connecting link, and the sliding sleeve gap is socketed on the column and can moves up and down along column; Holding screw is screwed onto on the sliding sleeve and as keeper and leans on column.
Described column also can be made up of two root posts side by side.
Annular concentric groove radius on the described disk can be equally spaced or not be equally spaced.
On the column on the described frame scale is installed, so that learn disc height and apart from the position of nozzle.
Because the present invention is placed on the nozzle bottom with an insulation disk that is processed with several annular concentric grooves; Disc centre is alignd with nozzle center, and several annular concentric grooves on the disk are used for receiving charged droplet, and the droplet flow Q that falls into each ring groove is measured; Wire netting all is equipped with in the bottom of each ring groove; Wire netting is connected with accurate microampere meter, is used to measure fall into the electric current I that charged droplet discharged in each ring groove, thereby obtains the lotus mass ratio q of droplet in all ring grooves
m(q
m=I/ ρ Q, ρ is the density of atomizing fluids here).Because all ring grooves are with one heart; And on disk, be in different radial positions; Therefore the specific charge of droplet can be similar to the specific charge as this radial position place in each ring groove, and the specific charge in all ring grooves has just disclosed the droplet specific charge regularity of distribution radially.Obviously, the ring groove number is many more, and the result is accurate more.Disk is installed on the column, through a sliding sleeve, can move up and down along column, therefore, also can obtain apart from the distribution of the specific charge of nozzle different vertical distance.Because the present invention reacts the local specific charge regularity of distribution radially through the specific charge of droplet in the annular concentric groove of several different radial positions on the disk; Realize the local specific charge test of different axial positions through the position of regulating disk; Therefore apparatus structure is simple; Processing cost is low, and is easy to adjust; The testing tool of device is only used accurate microampere meter and micro-flowmeter, so convenient measurement is prone to row.
Below in conjunction with accompanying drawing and specific embodiment the present invention is further described.
Description of drawings
Fig. 1 is that the present invention implements stereographic map;
Fig. 2 is the front view of apparatus of the present invention;
Fig. 3 is the vertical view of apparatus of the present invention.
Embodiment
The present invention is a kind of device of testing the local specific charge of atomization space in the electrostatic spray, and is as shown in Figure 1.Comprise proving installation of the present invention 1, charged droplets 2, metal electrode 3, nozzle 4, HV generator 5 among Fig. 1.
The described HV generator 5 of electrostatic high-pressure that provides is connected with nozzle 4, metal electrode 3 ground connection, and HV generator 5, nozzle 4, metal electrode 3 constitute a typical electrostatic atomizer like this, and produce charged droplets 2.Proving installation 1 is installed in the below of nozzle 4, is used to hold receive liquid from nozzle 4 ejection back formation charged droplets 2.
With reference to shown in Figure 1, disk 11, wire netting 12, micro-flowmeter 13, accurate microampere meter 14, frame 15 that described proving installation 1 is mainly made by insulating material are formed like Fig. 2, Fig. 3.Described disk 11 is unsettled to be installed on the frame 15 and disk 11 centers and nozzle 4 center-aligned; On disk 11, be processed with some annular concentric grooves 111; Annular concentric groove 111 radiuses can be equally spaced or not be equally spaced, and the width of ring groove 111, the degree of depth and groove number can be confirmed according to actual conditions.
In the proving installation 1, except wire netting 12, remaining part is all made with insulating material.
Described frame 15 is made up of connecting link 151, sliding sleeve 152, holding screw 153, column 154, base 155; The lower end of described column 154 is fixed on the base 155 and upwards and vertically holds up; One side of described disk 11 is connected with sliding sleeve 152 through connecting link 151, and the two ends of connecting link 151 can adopt the mode and the disk 11 that are threaded to be spirally connected with sliding sleeve 152; Described sliding sleeve 152 gaps are socketed on the column 154 and can move up and down along column 154; Holding screw is screwed onto on the sliding sleeve 152 and as keeper and leans on column 154, and sliding sleeve 152 is positioned on the column 154.On the column on the described frame 154 scale is installed, so that learn disk 11 height and apart from the position of nozzle 4.Described column 154 can be made up of two root posts side by side.
During installation,, disk 11 is transferred to required axial location, tighten holding screw 153 disk 11 centers and nozzle 4 center-aligned.
Principle of work of the present invention:
As shown in Figure 1; Liquid is charged in electric field, and jetting nozzle 4 backs form charged droplets, after charged droplets falls into each ring groove 111 of disk; According to following said computing method, just can obtain apart from the radially distribution of r (coordinate is referring to Fig. 2) of the local specific charge in a certain distance z of nozzle place.Regulate disk 11 height, can obtain the specific charge regularity of distribution of any axial positions z.
Computing method of the present invention:
The bottom of ring groove 111 of the present invention has aperture 112, connects micro-flowmeter 13 below, so that know the droplet flow Q that the unit interval falls in each ring groove.As the flow that atomizes is less, and also the useable glass graduated cylinder replaces flowmeter, directly reads the droplet volume V that falls in the certain hour t in the ring groove 111, is converted into flow Q then.The wire netting 2 that is positioned at ring groove 111 bottoms is connected with accurate microampere meter 4, can test the electric current I that charged droplets discharged that falls in the ring groove 111, thereby obtains the droplet specific charge q in each ring groove
m(q
m=I/ ρ Q, ρ are atomizing fluids density).The specific charge of droplet has disclosed the local specific charge regularity of distribution radially in all ring grooves 111.Sliding sleeve 152 in the frame 15 can slide along column 154 easy on and off, makes disk 11 places need height, thereby can obtain apart from the specific charge regularity of distribution at nozzle 4 different distance places.
The above; Be merely preferred embodiment of the present invention, the structure of frame can have multiple, so can not limit the scope that the present invention implements with this; The equivalence of promptly doing according to claim of the present invention and description changes and modifies, and all should still belong in the scope that patent of the present invention contains.
Claims (5)
1. device of testing the local specific charge of atomization space in the electrostatic spray, proving installation is installed in the below of nozzle, is used to hold receive liquid and form charged droplets from nozzle ejection back; It is characterized in that: described proving installation mainly is made up of disk, wire netting, micro-flowmeter, accurate microampere meter, frame that insulating material is made; Described disk is unsettled to be installed on the frame and disc centre is alignd with nozzle center; On disk, be processed with some annular concentric grooves; Wire netting is laid in bottom at every ring annular groove; The wire netting that is positioned at the ring groove bottom is connected and ground connection with accurate microampere meter, all offers an aperture in the bottom of every ring annular groove, connects micro-flowmeter or glass cylinder in the exit of aperture.
2. the device of the local specific charge of atomization space in the test electrostatic spray according to claim 1, it is characterized in that: described frame is made up of connecting link, sliding sleeve, holding screw, column, base; The lower end of described column is fixed on the base and upwards and vertically holds up; One side of described disk is connected with sliding sleeve through connecting link, and the sliding sleeve gap is socketed on the column and can moves up and down along column; Holding screw is screwed onto on the sliding sleeve and as keeper and leans on column.
3. the device of the local specific charge of atomization space in the test electrostatic spray according to claim 2, it is characterized in that: described column is made up of two root posts side by side.
4. the device of the local specific charge of atomization space in the test electrostatic spray according to claim 1, it is characterized in that: the annular concentric groove radius on the described disk is equally spaced or is not equally spaced.
5. the device of the local specific charge of atomization space in the test electrostatic spray according to claim 1 is characterized in that: on the column on the described frame scale is installed, so that learn disc height and apart from the position of nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105712108A CN102052943B (en) | 2010-11-24 | 2010-11-24 | Device for testing partial charge-to-mass ratio of fogging space in electrostatic spraying |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105712108A CN102052943B (en) | 2010-11-24 | 2010-11-24 | Device for testing partial charge-to-mass ratio of fogging space in electrostatic spraying |
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| Publication Number | Publication Date |
|---|---|
| CN102052943A CN102052943A (en) | 2011-05-11 |
| CN102052943B true CN102052943B (en) | 2012-05-30 |
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|---|---|---|---|
| CN2010105712108A Expired - Fee Related CN102052943B (en) | 2010-11-24 | 2010-11-24 | Device for testing partial charge-to-mass ratio of fogging space in electrostatic spraying |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103163388B (en) * | 2013-03-01 | 2015-08-26 | 江苏大学 | A kind of contactless electrostatic spray specific charge measuring method and device thereof |
| CN103439589B (en) * | 2013-08-19 | 2015-10-28 | 江苏大学 | A kind of charged droplets specific charge real-time measurement apparatus easy to assemble |
| CN103675486B (en) * | 2013-12-17 | 2017-01-18 | 江苏大学 | Measuring equipment for electrostatic spraying charge-to-mass ratio of multiple spray heads of spray rod |
| CN104296976B (en) * | 2014-09-11 | 2018-02-23 | 太仓市金港植保器械科技有限公司 | Electrostatic spray encircles testing adsorption effect support and its application |
| CN105590875B (en) * | 2014-10-21 | 2019-01-18 | 中芯国际集成电路制造(上海)有限公司 | Electrostatic test control wafer and static electricity testing method |
| CN107037275B (en) * | 2016-10-26 | 2019-08-16 | 北京航空航天大学 | A kind of device measuring single charged particle charge-mass ratio |
| CN107831374B (en) * | 2017-11-06 | 2020-01-24 | 中北大学 | Liquid jet static accumulation amount testing device and method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE20015147U1 (en) * | 2000-09-01 | 2000-12-07 | Océ Printing Systems GmbH, 85586 Poing | Device for measuring the ratio of charge to mass of toner in a two-component developer for electrophotographic devices |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002311073A (en) * | 2001-04-06 | 2002-10-23 | Keiji Taniguchi | Vibrating q/m measuring device for toner particle |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE20015147U1 (en) * | 2000-09-01 | 2000-12-07 | Océ Printing Systems GmbH, 85586 Poing | Device for measuring the ratio of charge to mass of toner in a two-component developer for electrophotographic devices |
Non-Patent Citations (3)
| Title |
|---|
| JP特开2002-311073A 2002.10.23 |
| 王贞涛 等.荷电雾滴荷质比测定装置与模型研究.《仪器仪表学报》.2008,第29卷(第8期),95-98. * |
| 陈志刚 等.网状目标法测量雾滴或粉尘荷质比的精度分析.《排灌机械》.2006,第24卷(第4期),40-43. * |
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