CN202870183U

CN202870183U - Charged droplet charge-to-mass ratio automatic measuring apparatus

Info

Publication number: CN202870183U
Application number: CN 201220620845
Authority: CN
Inventors: 魏胜非
Original assignee: Northeast Normal University
Current assignee: Northeast Normal University
Priority date: 2012-11-21
Filing date: 2012-11-21
Publication date: 2013-04-10
Anticipated expiration: 2022-11-21

Abstract

The utility model discloses a charged droplet charge-to-mass ratio automatic measuring apparatus, belonging to the field of electronics, and mainly aiming at overcoming the defect of big manual operation error in the existing charged droplet charge-to-mass ratio measurement. The charged droplet charge-to-mass ratio automatic measuring apparatus is composed of a sampling resistor, an atomizing nozzle, a droplet collector, a metal net, a droplet disc, a pressure sensor and the droplet disc. The charged droplet forms a ground loop via the metal net and the sampling resistor. The voltage signal on a sampling resistor is transmitted to a singlechip. Since the pressure sensor is located under the droplet disc, the weight of the droplet disc can be measured by the pressure sensor. When a power switch of the atomizing nozzle is closed, the signal is transmitted to the singlechip. Timing is started when the singlechip receives the signal until reaching the measuring time, and the period of time is the measurement time t. The pressure sensor transmits the signal thereof to the singlechip, wherein the signal indicates the droplet group mass m. Based on A=q/m=It/m, the singlechip can calculate the charge-to-mass ratio. The charged droplet charge-to-mass ratio automatic measuring apparatus is mainly used in the field of high-voltage static auxiliary liquid atomization.

Description

A kind of charged droplets specific charge self-operated measuring unit

Technical field

The utility model belongs to electronic applications, refers in particular to a kind of charged droplets specific charge self-operated measuring unit.

Background technology

High-pressure electrostatic auxiliary liquid atomization technique is the process that liquid crushing becomes charged drop under high-pressure electrostatic participates in.This atomization process that is participated in by high-pressure electrostatic is compared many characteristics that are better than conventional atomizing with other spray patterns.High-pressure electrostatic can reduce surface tension of liquid and atomizing resistance on the one hand, and droplet can be broken into less droplet with same sex electric charge under the electric field force effect, and the diameter of droplet distributes more even.Static has increased the control parameter in atomizing flow field on the other hand, namely in the certain situation of the parameters such as flow, pressure, nozzle diameter, can play certain regulating and controlling effect to atomizing flow field (such as droplet size, atomizing angle, range, droplet running orbit etc.) by changing electric pulse field parameter.Electrostatic atomization has been applied to pesticide spraying, industry spraying, material preparation, oil inflame, industrial dedusting and desulfurization at present, particle is poly-and reach many aspects such as separation.Particularly the application aspect industrial dedusting is particularly important.

When research and utilization high-pressure electrostatic atomized liquid, specific charge is very important parameter.Specific charge is carrying capacity and the ratio of material mass.Being the important indicator of weighing the charged effect of droplet, is the principal element that affects atomization of liquid effect.Measuring method commonly used is that the target mesh method is measured now.That is: charged droplets forms the loop after touching the wire netting of ground connection, electric charge produces little electric current at wire netting, after this electric current is connected to accurate microampere meter, can measure this current value, measure simultaneously droplet group's quality and corresponding Measuring Time, utilize following formula just can obtain specific charge, A=q/m=It/m; A is specific charge in the formula, and q is carrying capacity; M is droplet group quality; I is strength of current; T is Measuring Time.Measure droplet group quality and adopt graduated cylinder, measure strength of current and adopt microampere meter, adopt Measuring Time to use stopwatch.The experiment manual operations.Because manual measurement causes error larger, poor repeatability.In order to overcome this shortcoming, the utility model proposes a kind of charged droplets specific charge self-operated measuring unit, head it off.

Summary of the invention

Measure the large deficiency of error hand-manipulated in order to overcome existing charged droplets specific charge, the utility model provides a kind of charged droplets specific charge self-operated measuring unit, and this device can be measured the charged droplets specific charge automatically automatically.

The technical scheme that its technical matters that solves the utility model adopts is: the utility model device is comprised of sample resistance, atomizer, droplet gatherer, wire netting, droplet dish, pressure transducer, droplet dish, it is characterized in that: the droplet dish is connected with pressure transducer.

Principle of work of the present utility model is: in nozzle, be subject to the effect of high-voltage electrostatic field by the droplet of atomizer ejection, thus electric charge on the lotus.When the droplet with electric charge sprays in the droplet gatherer, run into the wire netting that is installed in the droplet gatherer.Because wire netting is by sample resistance ground connection, thereby charged droplet forms ground loop by wire netting and sample resistance.Voltage signal on the sample resistance is sent to single-chip microcomputer through after the analog to digital conversion, because the resistance of sample resistance is 1 ohm, so its magnitude of voltage equates with current value; The signal that both had been sent to single-chip microcomputer is the strength of current I that the droplet group forms.Charged Droplet loses electric charge after being adsorbed on the wire netting, flows into the droplet dish along the droplet collector wall, because droplet dish below is pressure transducer, so its weight can be measured by pressure transducer.

The atomizer high-voltage electric switch adopts double-point double-throw switch.When the power switch closure of atomizer, while single-chip microcomputer one interface ground connection, this interface is low level, signal is sent to single-chip microcomputer.Begin timing after single-chip microcomputer is received this signal, until measure constantly, this period is measurement time t.When measuring constantly then, pressure transducer is sent to single-chip microcomputer with its signal, and single-chip microcomputer is droplet group quality m after removing the droplet dish quality that prestores.According to A=q/m=It/m; A is specific charge in the formula, and q is carrying capacity; M is droplet group quality; I is strength of current; T is Measuring Time.Single-chip microcomputer can calculate specific charge.Measuring Time is pre-stored in the internal memory of single-chip microcomputer.Single-chip microcomputer is positioned at circuit box.

The beneficial effects of the utility model are, can automatically carry out the charged droplets specific charge and measure, and reduce because the error that manually-operated brings.It is mainly used in high-pressure electrostatic auxiliary liquid atomizing field.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is the longitudinal profile structural map of charged droplets specific charge self-operated measuring unit.

Fig. 2 is flow chart of the present utility model.

Fig. 3 is circuit theory diagrams of the present utility model.

1. sample resistances among the figure, 2. atomizer, 3. droplet gatherer, 4. wire netting, 5. droplet dish, 6. pressure transducer, 7. circuit box, 8. droplet, 9. single-chip microcomputer, 10. atomizer power switch, 11. atomizer high-voltage power supplies, 12. analog to digital conversion integrated packages.

Embodiment

In Fig. 1, droplet 8 sprays from atomizer 2, and droplet 8 enters in the droplet gatherer 3, and wire netting 4 is arranged in droplet gatherer 3, and wire netting 4 links to each other with sample resistance 1, and droplet dish 5 is positioned on the pressure transducer 6, and pressure transducer 6 is positioned on the circuit box 7.

In the embodiment shown in fig. 3, atomizer power switch 10 links to each other with atomizer high-voltage power supply 11, atomizer power switch 10 links to each other with the P2.7 interface of single-chip microcomputer 9, atomizer 2 links to each other with atomizer high-voltage power supply 11, wire netting 4 links to each other with sample resistance 1, sample resistance 1 links to each other with single-chip microcomputer 9 by analog to digital conversion integrated package 12, and pressure transducer 6 links to each other with the P2.5 interface of single-chip microcomputer 9.

Claims

1. a charged droplets specific charge self-operated measuring unit is comprised of sample resistance, atomizer, droplet gatherer, wire netting, droplet dish, pressure transducer, droplet dish, and it is characterized in that: the droplet dish is connected with pressure transducer.