CN210037390U

CN210037390U - Flow atomization sampling device

Info

Publication number: CN210037390U
Application number: CN201920825717.8U
Authority: CN
Inventors: 原胜军
Original assignee: Individual
Current assignee: Shandong Qiyuan Instrument Co ltd
Priority date: 2019-06-03
Filing date: 2019-06-03
Publication date: 2020-02-07
Anticipated expiration: 2029-06-03

Abstract

The utility model discloses an ultrasonic micropore atomization sample introduction device of a flow cell, which comprises a sample flow cell, a micropore diaphragm and an atomization chamber; the sample flowing pool is provided with a sample inlet and a liquid outlet; the sample solution is conveyed to the sample flow cell through the sample inlet, the sample solution is filled in the flow cell and forms a sample solution storage area together with the microporous membrane, and a matrix of the sample solution storage area and the microporous membrane are fixed in a seamless gluing mode without dead volume; the micropore diaphragm vibrates, the micropore ejects sample solution to atomize, the atomized sample is driven by carrier gas input by an air inlet pipe of the atomizing chamber and enters the analysis device; this novel atomizing simple structure, the maintenance of being convenient for wash, no dead volume hydrops, no residual interference, the atomizing of sample solution is efficient, and droplet granularity uniformity is better.

Description

Flow atomization sampling device

Technical Field

The utility model relates to a sampling device that analytical instruments such as atomic absorption spectrometry, atomic emission spectrometry, atomic fluorescence spectrometry, mass spectrometry adopted especially relates to a flow micropore diaphragm ultrasonic vibration atomizing sampling device.

Background

When an atomic absorption spectrometer, an atomic emission spectrometer, an atomic fluorescence spectrometer and a mass spectrometer analysis instrument analyze samples, sample injection is an important factor influencing analysis, and common sample solution atomization sample injection methods comprise pneumatic atomization, ultrasonic atomization, microwave thermal atomization and the like.

The pneumatic atomization is a method which utilizes the fluid dynamics principle, uses high-speed airflow to form negative pressure to suck sample solution, and the airflow strongly impacts liquid flow to break the liquid flow to form fine fog drops. Pneumatic atomizing's efficiency is often lower, and most samples can condense into liquid large granule waste liquid and flow out, and the sample that gets into analytical equipment is less. And pneumatic atomization utilizes air pressure, and the pressure of the gas end must be large enough to ensure atomization efficiency, so that a relatively large amount of gas correspondingly dilutes sample mist, and analysis results are obviously influenced.

The microwave thermal atomization is to heat a liquid sample to be detected by microwave to generate a superheated solution, and then generate atomized particles. The microwave thermal atomization method has a complex operation process, and the method is not widely applied.

The traditional ultrasonic atomization method utilizes ultrasonic waves to directionally pass through high-frequency resonance of a ceramic atomization sheet, so that the surface of a liquid is raised, cavitation is generated around the raised liquid surface, the liquid is atomized into micromolecular aerial fog, and the liquid water molecule structure is scattered to generate water fog.

The common ultrasonic atomizer for instrument analysis in the market is mainly U5000AT +, U6000AT + type of CETAC company, the structure of the ultrasonic atomizer mainly generates ultrasonic waves through a transducer, the vertical surface of the transducer is placed to prevent liquid from remaining, and a sample solution directly contacts with the surface of the transducer to vibrate to form fog. Because the resonant membrane of the ultrasonic atomizer is vertically arranged, the sample solution cannot stay on the resonant membrane for a long time under the action of gravity, so that the stay contact time of the sample solution and the surface of the resonant membrane is short, and part of the sample solution is discharged along the resonant membrane in a waste liquid form, thereby causing resource waste. And the equipment has large volume, high cost and small application range.

Further, an ultrasonic atomizer exemplified by patent document No. CN1232178A is applied to the field of emission spectroscopy. Although the resonant membrane of the ultrasonic atomizer is horizontally arranged, the ultrasonic atomization efficiency can be greatly improved, the closed space causes the waste liquid to be difficult to discharge, the sample changing time is prolonged, the ultrasonic atomizer is specially designed with a set of complex liquid discharge system and treatment mechanism for removing the waste liquid, and the complex operation flow causes great troubles to the actual analysis work.

In addition, the patent document CN104931420A discloses an ultrasonic atomizer, in which the sample of the ultrasonic atomizer still forms mist by flowing through the upper surface of the resonant membrane, and the ultrasonic atomizer needs to rely on a cooling system to stably operate.

SUMMERY OF THE UTILITY MODEL

The utility model provides a solve the waste liquid promptly and remain the problem, improve a flow cell micropore diaphragm ultrasonic vibration atomizing sampling device of sample solution atomizing efficiency again.

The flow cell microporous membrane atomization sampling device comprises a sample flow cell and an atomization chamber; a microporous membrane controlled by a circuit is arranged below the flow cell; the atomizing chamber is communicated with an air inlet; the flow cell is provided with a sample inlet and a liquid outlet;

the sample solution is introduced into the flow cell through the sample inlet to contact the microporous membrane, and the flow cell matrix and the microporous membrane form a sample solution storage area together.

The microporous membrane is preferably made of metal titanium, so that the microporous membrane is prevented from being damaged by corrosive or acid-base sample solution, the effective working time is prolonged, and the maintenance cost is reduced.

The flow cell preferably adopts quartz glass or other transparent acid and alkali-resistant materials, avoids receiving the harm of sample solution, is convenient for monitor simultaneously.

The carrier gas introduced into the atomizing chamber from the gas inlet pipe is determined according to the actual requirements of instrument analysis, and can be selected from argon, helium, nitrogen, air, acetylene, nitrous oxide and other single gases or mixed gases.

The microporous membrane vibrates, and the sample solution in the flow cell is ejected and atomized through the micropores of the membrane. The atomized sample solution is carried into the analysis device by the carrier gas entering from the gas inlet pipe.

The flow cell is communicated with a liquid outlet, so that the waste liquid, the cleaning liquid and the series sample solution can flow in and empty in a controlled sequence.

The basal body of the sample solution storage area and the microporous membrane are fixed in a seamless adhesive joint mode without dead volume.

The adopted cleaning liquid is secondary distilled water, so that residual influence is effectively avoided.

This neotype beneficial effect is:

1. the frequency of vibration is controlled by the circuit, and the atomization efficiency can be regulated and controlled by the circuit.

2. The sample atomization efficiency is high.

3. The flow cell design is convenient for wash, does not have dead volume hydrops, no residual interference.

5. Compared with the traditional high-pressure gas atomization and the traditional high-frequency ultrasonic atomization, the high-pressure gas atomization device is simple in structure and easy to maintain.

Drawings

The figure is a schematic structural diagram of the novel flow atomization sampling device.

The second figure is a structural schematic diagram of the novel flow atomization sampling device and the plasma torch.

Wherein: 1. an atomization chamber; 2. a sample inlet; 3. a carrier port; 4. a flow cell; 5. a microporous membrane; 6. a sample solution; 7. an analysis device transfer port; 8. A liquid discharge port; 9. atomizing a fluid; 10. a waste liquid port; 11. a fluid line; 12. a plasma torch.

Detailed Description

The flow atomization sampling device of the present invention is further described in detail with reference to the accompanying drawings.

Schematic diagram one

As shown in the figure I, a flow atomization sample introduction device is provided, and a microporous membrane 5 divides the device into a flow cell 4 and an atomization chamber 1.

The flow cell is provided with a sample inlet 2, the sample inlet 2 conveys a sample solution 6 to the flow cell 4 to contact the microporous membrane 5, and the sample solution 6 flows through the flow cell 4 and flows out through a liquid outlet 8;

the flow cell 4 forms a matrix of sample solution 6 storage areas and a microporous membrane 5 attached to the matrix is seamlessly secured.

The microporous membrane 5 vibrates, and the sample solution 6 is ejected by the microporous membrane 5 and enters the atomizing chamber 1 to form the atomized fluid 9.

In the atomization chamber 1, the atomized fluid 9 of the sample is carried into the analysis device by the carrier gas entering from the carrier gas port 3.

In the atomizing chamber 1, the condensed liquid of the sample atomizing fluid 9 is discharged from the waste liquid port 10.

As shown in fig. two, the analyzer adapter port 7 is connected to the fluid pipeline 11, and the atomized fluid 9 of the sample is carried into the plasma torch analyzer by the carrier gas entering from the carrier gas port 3, so as to analyze the sample components.

Adopt this novel realization concrete atomizing advance kind operation as follows:

sample introduction, wherein a sample solution 6 is conveyed to a flow cell 4 through a sample inlet 2 to contact a microporous membrane 5, an external circuit controls frequency, the frequency is acted on the microporous membrane 5, the microporous membrane 5 can convert energy to generate vibration, the sample solution 6 is ejected by micropores in an ejection mode, and an atomized fluid 9 is formed and enters an atomization chamber 1; the sample forming the atomized fluid 9 is carried to an analysis device switching port 7 behind the atomization chamber 1 by the carrier gas entering from the carrier gas port 3, and the sample atomized fluid 9 is led into a plasma torch 12 through a fluid pipeline 11 to carry out sample component analysis; the sample solution 6 which is analyzed and the cleaning solution which enters through the sample inlet 2 subsequently flow out through the liquid outlet 8, and the circulating sample introduction and cleaning process meets daily continuous use.

Claims

1. A flow atomization sampling device comprises a sample flow cell (4) and an atomization chamber (1); the atomizing chamber (1) is communicated with a gas carrying port (3), and the lower part of the atomizing chamber is communicated with a waste liquid port (10); the flow cell (4) is separated from the atomizing chamber (1), and a microporous membrane (5) is arranged on the separating wall; the sample inlet (2) conveys the sample solution to the flow cell (4) to contact with the microporous membrane (5), and residual liquid and subsequent cleaning liquid after sample atomization are discharged from a liquid outlet (8) of the flow cell (4); the method is characterized in that: the solution storage area formed by the flow cell (4) substrate and the microporous membrane (5) is free of residual design.

2. The flow atomizing sampling device of claim 1, characterized in that: the flow cell (4) is filled with a sample solution, and a sample solution storage area is formed by the base body of the flow cell (4) and the microporous membrane (5).

3. The flow atomizing sampling device of claim 1, characterized in that: and a sample solution storage area matrix formed by the flow cell (4) is fixed with a microporous membrane (5) connected with the matrix in a seamless gluing way.