CN115155077B

CN115155077B - Multi-component liquid micro-evaporation device

Info

Publication number: CN115155077B
Application number: CN202210786338.9A
Authority: CN
Inventors: 高炬; 赵蒙
Original assignee: Zaozhuang University
Current assignee: Zaozhuang University
Priority date: 2022-07-04
Filing date: 2022-07-04
Publication date: 2023-08-18
Anticipated expiration: 2042-07-04
Also published as: CN115155077A

Abstract

The application belongs to the technical field of material detection, and particularly relates to a multi-component liquid micro-evaporation device. The multi-component liquid micro-evaporation device comprises a sealed evaporation chamber, a laser arranged outside the evaporation chamber, an entrance arranged on the evaporation chamber and positioned on a laser light path, an air outlet mechanism arranged at the top of the evaporation chamber, a vacuum system for vacuumizing the evaporation chamber, a container arranged in the evaporation chamber and used for bearing a sample, and an ultrasonic device for providing ultrasonic vibration for the sample. According to the technical scheme provided by the application, the liquid sample is evaporated by the pulse laser, because the laser pulse is short, the evaporation only occurs on the surface of the liquid, and the sample main body is still kept at a lower temperature, so that the generated steam can basically keep the evaporation of the multi-component liquid sample according to the original ratio, and in addition, the liquid and the container wall can not react due to high temperature, so that the high purity of the steam is ensured.

Description

Multi-component liquid micro-evaporation device

Technical Field

The application belongs to the technical field of material detection, and particularly relates to a multi-component liquid micro-evaporation device.

Background

Some specific atmosphere tests require detection of specific vapors generated by liquid substances, such as simulated drug vapors, battlefield poison gas detection, pesticide injury assessment, chemical sensing tests, medical property observations, etc. Generally, the liquid material evaporation vapor source is heated to achieve liquid/gas phase transition.

However, in the above specific requirements, the liquid material generally contains multiple components, and the vapor of the same component cannot be obtained because the boiling points of the different components are different and the components are vaporized at different temperatures. If it is desired to prepare mixed multicomponent vapors having different boiling points, it is only possible to evaporate the individual components separately and then mix them in the mixing vessel in proportions. And the greater the difference between the boiling points of the components, the greater the difference between the composition of the initially mixed multi-component liquid and the composition of the final mixed multi-component vapor.

In addition, many liquids are susceptible to reaction with the vessel at high temperatures, and thus non-raw materials are also present in the vapor, so in order to facilitate high purity specific atmosphere testing, it is desirable to design a device that can simultaneously evaporate the multicomponent mixed liquid and substantially maintain the ratio of its source components.

Disclosure of Invention

The application provides a multi-component liquid micro-evaporation device, which is used for solving the problem that the gas composition of the evaporated multi-component liquid cannot be kept unchanged by the existing evaporation method.

In order to solve the technical problems, the technical scheme of the application is as follows: the multi-component liquid micro-evaporation device comprises a sealed evaporation chamber, a laser arranged outside the evaporation chamber, an entrance arranged on the evaporation chamber and positioned on a laser light path, an air outlet mechanism arranged at the top of the evaporation chamber, a vacuum system for vacuumizing the evaporation chamber, a container arranged in the evaporation chamber and used for bearing a sample, and an ultrasonic device for providing ultrasonic vibration for the sample.

The greatest obstacle of liquid evaporation by laser is that the liquid is generally transparent and cannot absorb laser energy, the surface of the liquid is flat like a mirror surface, most of light beams are reflected, and in order to solve the problems of reflection on the surface of the liquid and non-absorption of energy by transparent liquid, the ultrasonic wave vibration damages the flatness of the surface of the liquid by an ultrasonic device, so that the surface of the liquid is in an irregular rough surface form, the mirror surface reflection is changed into diffuse reflection, and simultaneously, a large amount of micro bubbles are generated in the liquid by ultrasonic waves, so that the liquid becomes turbid and opaque, and the absorption of laser energy is enhanced.

Optionally, the material of the container is selected from glass, ceramic, metal or polymer materials.

Optionally, the container is a flat basin. The volume and shape are not limited, and the bottom needs to be flat so as to facilitate the installation of the ultrasonic transducer.

Optionally, the ultrasonic device comprises an ultrasonic vibration plate arranged at the bottom of the container, a transducer for driving the ultrasonic vibration plate and an ultrasonic generator connected with the transducer.

Optionally, the working frequency of the transducer is 20-40kHz.

Optionally, heating means for heating the sample in the container are also included.

The heating device controls the temperature of the liquid to keep the liquid in a critical state which is easier to vaporize, so that the vaporization efficiency is enhanced, and certain substances with low melting point, such as gallium, lead, tin and the like, which are solid at normal temperature can also be changed into liquid targets by heating.

Optionally, an optical lens group for expanding beams is arranged between the laser and the entrance.

Optionally, the angle between the laser beam projected by the laser and the horizontal liquid level of the sample in the container is 30-90 degrees.

Optionally, the laser beam is a pulse laser, the wavelength is not limited, the pulse repetition frequency of the pulse laser is 0-1kHz, the pulse energy is determined by the flow rate of the evaporated liquid and the vapor, and the pulse energy is generally 1-10000 millijoules.

Optionally, the air outlet mechanism comprises a steam delivery pipe and a stop valve arranged on the steam delivery pipe.

Optionally, the vacuum system comprises a vacuum pump, a vacuum tube communicating the vacuum pump with the evaporation chamber, and a vacuum valve disposed on the vacuum tube.

According to the technical scheme provided by the application, the liquid sample is evaporated by the pulse laser, because the laser pulse is short, the evaporation only occurs on the surface of the liquid, and the sample main body is still kept at a lower temperature, so that the generated steam can basically keep the evaporation of the multi-component liquid sample according to the original ratio, and in addition, the liquid and the container wall can not react due to high temperature, so that the high purity of the steam is ensured.

Drawings

FIG. 1 is a schematic structural view of a multi-component liquid micro-evaporation device according to an embodiment of the present application.

The figure shows:

10-evaporating chamber, 20-laser, 21-optical lens group, 30-entrance, 40-air outlet mechanism, 41-steam delivery pipe, 42-stop valve, 50-vacuum system, 51-vacuum tube, 52-vacuum valve, 60-container, 70-ultrasonic vibration plate, 80-heating device.

Detailed Description

For ease of understanding, the multi-component liquid micro-evaporation device is described below in conjunction with the examples, which are to be understood as merely illustrative of the present application and not as limiting the scope of the application.

In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions and positional relationships shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

As shown in FIG. 1, the multi-component liquid micro-evaporation device comprises

A closed evaporation chamber 10;

the laser 20 is arranged outside the evaporation chamber 10, the laser 20 is positioned at the upper right of the evaporation chamber 10, the laser beam projected by the laser 10 obliquely enters the evaporation chamber 10 downwards from the upper right, the laser beam is pulse laser, the included angle between the laser beam and the horizontal liquid level of the sample is about 60 degrees, the pulse repetition frequency of the pulse laser is 0.5kHz, the pulse energy is determined by the flow of the evaporated liquid and the flow of the steam, and the pulse energy is generally 1-10000 mJ;

an entrance port 30 disposed on the evaporation chamber 10 and located on the optical path of the laser 20, wherein the entrance port 30 is a condensing pipeline extending from the evaporation chamber 10, and an optical lens group 21 for expanding beams is disposed between the laser 20 and the entrance port 30;

an air outlet mechanism 40 provided at the top of the evaporation chamber 10, the air outlet mechanism 40 including a steam delivery pipe 41 and a shut-off valve 42 provided on the steam delivery pipe 41;

a vacuum system 50 for evacuating the evaporation chamber 10, the vacuum system 50 including a vacuum pump (not shown), a vacuum pipe 51 for communicating the vacuum pump with the evaporation chamber 10, and a vacuum valve 52 provided on the vacuum pipe 51;

a container 60 disposed in the evaporation chamber 10 for carrying a sample, wherein the container is made of glass, ceramic, metal or polymer material, in this embodiment ceramic, and is a flat basin;

an ultrasonic device for providing ultrasonic vibration to a sample, wherein the ultrasonic vibration adopts an ultrasonic vibration plate, an ultrasonic vibration rod or other schemes capable of destroying the mirror reflection of liquid and strengthening the absorption of laser energy are all the inventive concepts, and the ultrasonic device comprises an ultrasonic vibration plate 70 arranged at the bottom of the container 60, a transducer (not shown in the figure) for driving the ultrasonic vibration plate 70 and an ultrasonic generator (not shown in the figure) connected with the transducer (not shown in the figure), wherein the working frequency of the transducer is 35Hz;

and a heating device 80 for heating the sample in the container, in this embodiment, the heating device 80 is disposed at the bottom of the container 60, and the heating mode may be resistance heating, and the heating position may be disposed at the bottom, or may be disposed at the side wall of the container, or the temperature in the entire evaporation chamber 10 may be controlled in the evaporation chamber 10.

The working process of the multi-component liquid micro-evaporation device is briefly described as follows: placing the sample in the container 60, closing the evaporation chamber 10, closing the stop valve 42, starting the vacuum system 50 to vacuumize the evaporation chamber 10, then closing the vacuum valve 52 to turn on the ultrasonic device and the heating device 80, then turning on the laser 20, expanding the pulse laser beam through the optical lens group 21, passing through the entrance port 30 to the surface of the sample liquid, generating steam, opening the stop valve 42, and collecting the steam sample from the outlet of the steam delivery pipe 41.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting. Although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments may be modified or some or all of the technical features may be replaced with other technical features, which do not depart from the scope of the technical scheme of the embodiments of the present application.

Claims

1. The multi-component liquid micro-evaporation device is characterized by comprising a closed evaporation chamber, a laser arranged outside the evaporation chamber, an entrance arranged on the evaporation chamber and positioned on a laser light path, an air outlet mechanism arranged at the top of the evaporation chamber, a vacuum system for vacuumizing the evaporation chamber, a container arranged in the evaporation chamber and used for bearing a sample, and an ultrasonic device for providing ultrasonic vibration for the sample; the ultrasonic device comprises an ultrasonic vibration plate arranged at the bottom of the container, a transducer for driving the ultrasonic vibration plate and an ultrasonic generator connected with the transducer; the working frequency of the transducer is 20-40 kHz; the included angle between the laser beam projected by the laser and the horizontal liquid level of the sample in the container is 30-90 degrees.

2. The multi-component liquid micro-evaporation device according to claim 1, wherein the container is made of glass, ceramic, metal or polymer material.

3. The multi-component liquid micro-evaporation device according to claim 1, further comprising heating means for heating the sample in the container.

4. The micro-evaporation device according to claim 1, wherein an optical lens group for beam expansion is arranged between the laser and the entrance.

5. The multi-component liquid micro-evaporation device according to claim 1, wherein the laser beam is a pulse laser, the pulse repetition rate of the pulse laser is 0-1kHz, and the pulse energy is 1-10000 millijoule.

6. The multi-component liquid micro-evaporation device according to claim 1, wherein the air outlet mechanism comprises a steam delivery pipe and a stop valve provided on the steam delivery pipe.

7. The multi-component liquid micro-evaporation device according to claim 1, wherein the vacuum system comprises a vacuum pump, a vacuum tube communicating the vacuum pump and the evaporation chamber, and a vacuum valve provided on the vacuum tube.