CN-122017273-A - Concentric atomizer

Abstract

The application discloses a concentric atomizer which comprises a gas sleeve and a liquid introducing pipe which are coaxially arranged, wherein the gas sleeve comprises a gas channel for circulating gas, a sleeve cavity is formed in the gas sleeve, the liquid introducing pipe for circulating a liquid sample is arranged in the sleeve cavity, the direction of circulating gas of the gas sleeve is the same as that of the liquid introducing pipe for circulating the liquid sample, the gas channel surrounds the liquid introducing pipe, the tail section of the liquid introducing pipe is formed into a stable section, the stable section comprises a first inner cavity for circulating the liquid sample, the radial dimension of the first inner cavity is gradually increased along the circulating direction of the liquid sample, so that the flow velocity of the liquid sample is gradually reduced and shaped when the liquid sample flows through the stable section, the liquid sample is convenient to be uniformly sheared by the gas, small and stable aerosol is formed, and the risk of blockage at a tail end outlet which is easy to block is reduced due to the gradual increase of the radial dimension of the first inner cavity, and the concentric atomizer has wide adaptability.

Inventors

• ZHENG YANFEN
• HUANG JUYANG
• HE XUEHAN
• HUANG HUAIYI
• LIU SHUYU

Assignees

• 中山大学

Dates

Publication Date

20260512

Application Date

20260123

Claims (10)

1. 1. A concentric atomizer, comprising: The gas sleeve comprises a gas channel, wherein the gas channel is used for circulating gas, and a sleeve cavity is formed in the gas sleeve; the liquid introducing pipe is used for circulating a liquid sample, is arranged in the sleeve cavity and is coaxially arranged with the gas sleeve; the gas sleeve circulates gas in the same direction as that of the liquid sample flowing through the liquid introducing pipe, the gas channel surrounds the liquid introducing pipe, the liquid introducing pipe comprises a stabilizing section, the tail section of the liquid introducing pipe is formed into the stabilizing section, the stabilizing section comprises a first inner cavity for circulating the liquid sample, the radial dimension of the first inner cavity is gradually increased along the circulating direction of the liquid sample, and the gas flows out from the tail end of the gas sleeve to annularly shear the liquid sample flowing out from the tail end of the stabilizing section.
2. 2. The concentric atomizer of claim 1, wherein a gap is formed between the liquid introduction tube and the gas sleeve, the gap being formed as the gas passage.
3. 3. The concentric atomizer of claim 1, wherein the cross-sectional shape of the inner wall of the stabilizing section in the direction of flow of the liquid sample is one of a straight line, a stepwise fold line, and a parabolic line.
4. 4. The concentric atomizer of claim 1, wherein the liquid introduction tube comprises an introduction section comprising a second lumen for introducing a liquid sample, the second lumen having a uniform radial dimension, the end of the introduction section being connected to the beginning of the stabilizing section, the second lumen having a radial dimension that is the same as the radial dimension of the beginning of the first lumen.
5. 5. The concentric atomizer of claim 1, wherein a radial dimension D 1 at a beginning of the first inner chamber is smaller than a radial dimension D 2 at an end of the first inner chamber, and a length L of the stabilizing section in an axial direction satisfies l≥5 (D 2 -D 1 )。
6. 6. The concentric atomizer of claim 1, wherein the first lumen has a radial dimension D 1 at the beginning of the first lumen of between 30 μm and 70 μm, a radial dimension D 2 at the end of the first lumen of between 60 μm and 150 μm, and a ratio D 2 /D 1 between D 1 and D 2 of between 1.5 and 3.0.
7. 7. A concentric atomizer according to claim 1, wherein the gas channel end section is formed with an accelerating section which gradually constricts in the gas flow direction, the accelerating section end having a dimension in the radial direction of the gas sleeve of between 10 μm and 50 μm.
8. 8. The concentric atomizer of claim 1, wherein the gas sleeve is formed with a flow guide at the end of the gas passage, the flow guide being inclined toward the liquid introduction tube, the flow guide being capable of gas packing and shearing the liquid sample flowing out of the end of the liquid introduction tube.
9. 9. The concentric atomizer of claim 1, wherein the liquid introduction tube and the gas sleeve are integrally formed by precision micro-machining or assembled and fixed by a high concentricity fixture, and wherein a coaxiality error between the liquid introduction tube and the gas sleeve is less than 5 μm.
10. 10. The concentric atomizer of claim 1, wherein the liquid introduction tube is made of fused quartz, sapphire, or a chemically inert polymer.

Description

Concentric atomizer Technical Field The application relates to the technical field of sample introduction devices of analytical instruments, in particular to a concentric atomizer. Background Pneumatic concentric atomizers are a key component in atomic spectroscopy and mass spectrometry analysis for converting liquid samples into aerosols. Conventional concentric atomizers (e.g., meinhard type) employ a tapered capillary tube with a sharp end, which uses a venturi effect created by a high velocity gas stream at a nozzle to aspirate and break up the liquid, with a sample aspiration efficiency of about 1 ml/min. The analysis of micro-samples is important for applications limited by clinical, biological, forensic and other samples, and in addition, it is also desirable to minimize waste when analyzing toxic and radioactive samples. Therefore, the capillary of the conventional concentric atomizer and the direct injection atomizer has extremely small inside diameter at the end, which is liable to cause physical blockage of a sample containing biological cells, nanoparticle clusters or high salt precipitates, and for biological cells having a diameter of about 10-20 μm, they are liable to break and lose when passing through narrow ends and subjected to severe shearing, which results in low technical efficiency in single cell analysis and low and unstable transport efficiency. Disclosure of Invention The present application aims to solve at least one of the technical problems existing in the prior art. In view of the above, the present application provides a concentric atomizer which is not only less likely to cause clogging of a pipe, but also stabilizes a flow pattern to form a small and stable aerosol. The concentric atomizer comprises a gas sleeve, a liquid introducing pipe and a liquid introducing pipe, wherein the gas sleeve comprises a gas channel, the gas channel is used for circulating gas, a sleeve cavity is formed in the gas sleeve, the liquid introducing pipe is used for circulating a liquid sample, the liquid introducing pipe is arranged in the sleeve cavity and is coaxial with the gas sleeve, the direction of circulating gas of the gas sleeve is the same as that of circulating the liquid sample through the liquid introducing pipe, the gas channel surrounds the liquid introducing pipe, the liquid introducing pipe comprises a stabilizing section, the tail section of the liquid introducing pipe is formed into the stabilizing section, the radial dimension of the first inner cavity is gradually increased along the circulating direction of the liquid sample, and the flowing gas of the tail end of the gas sleeve is used for shearing the liquid sample flowing out of the tail end of the stabilizing section in a circumferential direction. According to an embodiment of the present application, a gap is formed between the liquid introduction pipe and the gas sleeve, the gap being formed as the gas passage. According to the embodiment of the application, the cross section of the inner wall of the stabilizing section in the flowing direction of the liquid sample is one of a straight line, a stepped fold line and a parabola. According to an embodiment of the application, the liquid introduction tube comprises an introduction section comprising a second lumen for introducing a liquid sample, the radial dimensions of the second lumen being uniform, the end of the introduction section being connected to the beginning of the stabilizing section, the radial dimensions of the second lumen being the same as the radial dimensions of the beginning of the first lumen. According to an embodiment of the present application, a radial dimension D 1 at a beginning end of the first inner cavity is smaller than a radial dimension D 2 at an end of the first inner cavity, and a length L of the stabilizing section along an axial direction satisfies that L is equal to or greater than 5(D2-D1)。 According to an embodiment of the application, the radial dimension D 1 at the beginning of the first lumen is between 30 μm and 70 μm, the radial dimension D 2 at the end of the first lumen is between 60 μm and 150 μm, and the ratio D 2/D1 between D 1 and D 2 is between 1.5 and 3.0. According to an embodiment of the application, the gas passage end section is formed with an acceleration section which gradually contracts in the gas flowing direction, the dimension of the acceleration section end in the radial direction of the gas jacket being between 10 μm and 50 μm. According to an embodiment of the present application, the gas sleeve is formed with a flow guide member at the end of the gas passage, the flow guide member being inclined toward the liquid introduction tube, the flow guide member being capable of gas-wrapping and shearing the liquid sample flowing out of the end of the liquid introduction tube. According to the embodiment of the application, the liquid introducing pipe and the gas sleeve are integrally formed through precise microm