CN217313970U

CN217313970U - Atomizer special for evaporative light scattering detector

Info

Publication number: CN217313970U
Application number: CN202220997063.9U
Authority: CN
Inventors: 陈育拼; 王宝雷
Original assignee: SOOCHOW HIGH TECH CHROMATOGRAPHY CO LTD
Current assignee: SOOCHOW HIGH TECH CHROMATOGRAPHY CO LTD
Priority date: 2022-04-26
Filing date: 2022-04-26
Publication date: 2022-08-30
Anticipated expiration: 2032-04-26

Abstract

The utility model relates to a dedicated atomizer of evaporative light scattering detector. Including the mixing chamber, the mixing chamber entry end is linked together through convergent spray tube and gas circuit joint, and gas circuit joint connection is at convergent spray tube entry end, and the mixing chamber entry end is connected to convergent spray tube exit end, and the mixing chamber exit end is connected with the diffuser pipe entry end, and the diffuser pipe exit end links to each other with the drift tube, and the mixing chamber outside has the micropore, and the mixing chamber passes through the micropore and links to each other with empty straw one end, and the empty straw other end and three-way valve link to each other. Has the advantages that: based on the Bernoulli equation, pressure difference is formed between the airflow and the liquid chromatogram mobile phase by utilizing the pressure change of the airflow in the spray pipe, the mobile phase is pressed into the mixer by utilizing the pressure difference to be mixed with the high-speed airflow, and meanwhile, the designed spray pipe can ensure the straightness, uniformity and stability of the sprayed atomized airflow; the amount of the mist can be adjusted by adjusting the pressure of the mobile phase or the pressure of the air flow, and the device is used for analyzing and separating a large number of samples without a flow divider.

Description

Atomizer special for evaporative light scattering detector

Technical Field

The utility model belongs to the technical field of check out test set, concretely relates to dedicated atomizer of evaporative light scattering detector.

Background

The evaporative light scattering detector is a universal quality detector, has wide solvent and gradient compatibility, does not need a sample to have light absorption characteristics, and is widely applied to the analysis and separation of substances such as saccharides, phospholipids, amino acids, fatty acids and the like since the last 90 th century; among these, the size and uniformity of the droplets atomized by the atomizer are important factors in ensuring the sensitivity and repeatability of the detector.

At present, an atomizer used by an evaporation light detector directly introduces a mobile phase into a mixing chamber to be mixed with high-speed airflow and then is sprayed out from a pore, the atomization is unstable under the influence of various factors such as temperature, airflow stability and mobile phase flow, and when the atomizer is used for analyzing and separating a large number of samples, a flow divider needs to be used in an auxiliary way, and a part of the flow divided from the large-flow mobile phase is used for detection; for example, chinese patent document discloses a temperature-controlled atomizer [ CN108262181A ] for an evaporative light scattering detector, comprising an atomizer main body, an atomizer head provided on the front side of the atomizer main body, an adjusting device provided on the rear side of the atomizer main body, the adjusting device being connected to a capillary tube, the adjusting device comprising an adjusting screw, the capillary tube being connected to the atomizer main body via the adjusting screw, and a heating device provided outside the capillary tube.

For another example, the chinese patent document discloses a nebulizer [ CN110876991A ] for an evaporative light scattering detector, comprising a nebulizer body, the atomizer main body is provided with an atomizer head, the atomizer main body is provided with a detachable adjusting two-way pipe, the adjusting two-way is provided with a liquid inlet pipe and a flow passage communicated with the liquid inlet pipe, the outlet end of the adjusting two-way is detachably connected with a capillary tube communicated with the flow passage, the atomizer main body is provided with a central gas channel, a first gas channel and a second gas channel which are communicated with the two sides of the central gas channel and are obliquely arranged, the atomizing head is provided with a third gas channel communicated with the central gas channel, the capillary tube extends into the third gas channel and contracts into the third gas channel, and a gap is reserved between the outer wall of the capillary tube and the inner wall of the third gas channel.

For another example, chinese patent document discloses an atomizer [ CN207717619U ] of an improved evaporative light scattering detector, which includes a main body, an induced draft fan is fixed on the top of the upper end of the main body, a plurality of uniformly arranged through holes a are arranged on the upper end of the main body, the through holes a are in sealed communication with the air outlet of the induced draft fan, the main body is entirely in a spindle shape, the cavity inside the main body is in a spindle shape, a thin opening is arranged in the middle of the main body, a plurality of uniformly arranged through holes B are arranged on the side wall of the thin opening, a cover body fixedly connected to the main body is sleeved on the middle of the main body, the cover body and the main body are sealed, the thin opening is communicated with the inside of the cover body by the through holes B, a mist inlet pipe communicated with the inside of the cover body is fixed on the cover body, a valve is installed on the mist inlet pipe, an annular T-shaped groove is arranged on the lower end of the main body, and a T-shaped block connected to the T-shaped block is arranged in the T-shaped groove in a sliding manner.

The solutions improve the shape of the atomizer, such as adding a heating function and the like, but do not change the basic working principle.

Disclosure of Invention

The utility model aims at the above-mentioned problem, provide a dedicated atomizer of evaporation light scattering detector.

In order to achieve the above purpose, the utility model adopts the following technical proposal: this dedicated atomizer of evaporation light scattering detector, its characterized in that, this atomizer includes the mixing chamber, the mixing chamber entry end be linked together through convergent spray tube and air circuit joint, air circuit joint connection at convergent spray tube entry end, convergent spray tube exit end connect the mixing chamber entry end, the mixing chamber exit end be connected with the diffuser pipe entry end, just the diffuser pipe exit end link to each other with the drift tube, the mixing chamber outside micropore has, just the mixing chamber pass through the micropore and link to each other with empty straw one end, just the empty straw other end and the three-way valve that is located the mixing chamber below link to each other.

In the atomizer dedicated for the evaporative light scattering detector, the three-way valve is provided with a liquid inlet for flowing in the mobile phase and a liquid outlet for flowing out the waste liquid, and the hollow suction pipe is communicated with a bypass of the three-way valve.

In the atomizer special for the evaporative light scattering detector, the gas path joint is connected with a gas source end, the gas source end is any one of an air compressor, a gas generator and a gas storage bottle, the gas in the gas source end is any one or combination of air, nitrogen and helium, the gas pressure is not more than 5Mpa, and the flow is not more than 10m 3/min.

In the atomizer special for the evaporative light scattering detector, the sectional area of the tapered nozzle gradually decreases from the inlet end to the outlet end, and the diameter of any section of the tapered nozzle conforms to a Wittonsisky curve, wherein the diameter of the inlet end of the tapered nozzle is 3.2mm to 8.0mm, the diameter of the outlet end of the tapered nozzle is 2.0mm to 7.4mm, and the length of the tapered nozzle is 1.0mm to 10.0 mm.

In the atomizer special for the evaporative light scattering detector, the diameter of any cross section of the mixing chamber is unchanged, the diameter of the inlet end or the outlet end of the mixing chamber is 2.0mm to 7.4mm, the length of the mixing chamber is 0.5mm to 5.0mm, the micropores are arranged on the middle tube wall of the mixing chamber, and the diameter of the micropores is 0.1mm to 1.0 mm.

In the atomizer special for the evaporative light scattering detector, the diameter of any cross section of the hollow suction pipe is constant, the diameter is 0.1mm to 1.0mm, and the length is 20mm to 200 mm.

In the atomizer special for the evaporative light scattering detector, the sectional area of the diffuser pipe is gradually increased from the inlet end to the outlet end, the diameter of the inlet end of the diffuser pipe is 2.0mm to 7.4mm, the length of the diffuser pipe is 1.0mm to 20.0mm, and the half divergence angle is 10 degrees to 45 degrees.

In the dedicated atomizer of foretell evaporative light scattering detector, this atomizer still includes the atomizer pedestal, just convergent spray tube, mixing chamber and diffuser pipe respectively coaxial setting and be formed at the atomizer pedestal internally, just the gas circuit connect and set up in the atomizer pedestal outside.

In the atomizer dedicated for the evaporative light scattering detector, one end of the hollow suction pipe penetrates through the atomizer seat body and is communicated with the mixing chamber, and the other end of the hollow suction pipe extends to the outer side of the atomizer seat body and is communicated with the three-way valve.

Compared with the prior art, the utility model has the advantages of: based on the Bernoulli equation, namely, the pressure difference is formed between the airflow and the liquid chromatogram mobile phase by utilizing the pressure change of the airflow in the spray pipe, the mobile phase is pressed into the mixer by utilizing the pressure difference to be mixed with the high-speed airflow, and meanwhile, the designed spray pipe can ensure the flatness, uniformity and stability of the sprayed atomized airflow; the amount of the mobile phase entering the mixing chamber is positively correlated with the pressure difference between the airflow and the mobile phase in the mixing chamber, so that the mist quantity can be adjusted by adjusting the pressure of the mobile phase or the pressure of the airflow, and the device is used for analyzing and separating a large number of samples without a flow divider.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic structural view of a convergent nozzle of the present invention;

fig. 3 is a schematic structural view of the diffuser pipe of the present invention;

in the figure, a mixing chamber 1, a reducing nozzle 2, an air path joint 3, a diffuser pipe 4, a micropore 5, an air suction pipe 6, a three-way valve 7, a liquid inlet 71, a liquid outlet 72, a bypass 73 and an atomizer base body 8.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, the atomizer dedicated for an evaporative light scattering detector in this embodiment includes an atomizer base 8, wherein a tapered nozzle 2, a mixing chamber 1 and a diffuser tube 4 are coaxially disposed and formed in the atomizer base 8, and an air path joint 3 is disposed outside the atomizer base 8, an inlet end of the mixing chamber 1 is communicated with an air path joint 3 through the tapered nozzle 2, the air path joint 3 is connected to an inlet end of the tapered nozzle 2, an outlet end of the tapered nozzle 2 is connected to an inlet end of the mixing chamber 1, an outlet end of the mixing chamber 1 is connected to an inlet end of the diffuser tube 4, an outlet end of the diffuser tube 4 is connected to a drift tube, a micro hole 5 is disposed outside the mixing chamber 1, the mixing chamber 1 is connected to one end of an air suction tube 6 through the micro hole 5, and the other end of the air suction tube 6 is connected to a three-way valve 7 disposed below the mixing chamber 1, preferably, one end of the air suction tube 6 is inserted into the atomizer base 8 and communicated with the mixing chamber 1, the other end extends to the outer side of the atomizer seat body 8 and is communicated with the three-way valve 7.

Obviously, in the embodiment, the pressure difference is formed between the gas flow and the liquid chromatography mobile phase by using the pressure change of the gas flow in the spray pipe, the mobile phase is pressed into the mixer by using the pressure difference to be mixed with the high-speed gas flow, and meanwhile, the designed spray pipe can ensure the straightness, uniformity and stability of the sprayed atomized gas flow.

Preferably, the three-way valve 7 here has an inlet 71 for the inflow of the mobile phase and an outlet 72 for the outflow of the waste liquid, and the suction tube 6 communicates with a bypass 73 of the three-way valve 7.

The gas circuit connector 3 is connected with a gas source end, the gas source end is any one of an air compressor, a gas generator and a gas storage bottle, gas in the gas source end is any one or combination of air, nitrogen and helium, the gas pressure is not more than 5Mpa, and the flow is not more than 10m 3/min. The amount of the mobile phase entering the mixing chamber is positively correlated with the pressure difference between the airflow and the mobile phase in the mixing chamber, so that the mist quantity can be adjusted by adjusting the pressure of the mobile phase or the pressure of the airflow, and the device is used for analyzing and separating a large number of samples without a flow divider. For example, where the carrier gas is air, supplied by an air compressor, the pressure to the inlet of the atomizer is 0.5 Mpa.

As shown in fig. 2, the sectional area of the convergent nozzle 2 is gradually reduced from the inlet end to the outlet end, and any sectional diameter conforms to the vittonsiki curve, the inlet end diameter of the convergent nozzle 2 is 3.2mm to 8.0mm, the outlet end diameter is 2.0mm to 7.4mm, and the length is 1.0mm to 10.0 mm. For example, where the tapered nozzle inlet radius R1 is 4.0mm, the outlet R2 radius is 3.0mm, the length L1 is 5.0mm, and the radius R at any section X on the converging section is:

the sectional area of the diffuser pipe 4 here becomes gradually larger from the inlet end to the outlet end, and the inlet end diameter of the diffuser pipe 4 is 2.0mm to 7.4mm, the length of the diffuser pipe 4 is 1.0mm to 20.0mm, and the half divergence angle is 10 ° to 45 °. For example, as shown in FIG. 3, here the diffuser pipe inlet radius R3 is 3.0mm, the length L2 is 5.0mm, and the half divergence angle α is 15. The radius of the inlet end of the mixing chamber 1 is 3.0mm, the radius of the outlet end of the mixing chamber is 3.0mm, the length of the mixing chamber is 2.0mm, the diameter of any cross section is unchanged, and the radius of the micropore 5 used for connecting an empty suction pipe on the middle pipe wall is 0.1 mm. Preferably, the hollow suction pipe 6 has a radius of 0.1mm and a length of 20mm, with any cross-sectional diameter being constant.

The principle of the embodiment is as follows: the gas can be considered to be adiabatically flowing when flowing through the convergent nozzle 2 for a short time, and the critical flow rate is determined by combining an energy equation, a continuity equation, a kinetic energy equation, subsonic gas flow M < 1 and the convergent nozzle 2 according to the inlet gas flow state of the convergent nozzle 2; the pressure and the flow of the gas entering the tapered spray pipe 2 are controlled, so that the gas flow adiabatically expands in the tapered spray pipe 2, the gas flow rate is increased, the pressure is reduced, the temperature is reduced, the flow rate of the outlet of the tapered spray pipe 2 is lower than the critical flow rate, the subcritical flow rate gas enters the mixing chamber 1, and a low-pressure area is formed in the mixing chamber 1; the mobile phase of the liquid chromatogram is generally composed of water and an organic phase according to a certain proportion, which can be regarded as incompressible viscous liquid to be laminar flow in a horizontal and uniform pipeline, the Bernoulli equation and the Poiseuse's law are applied, the flow velocity of the mobile phase, the inner diameter and the length of the pipeline can change the pressure of the mobile phase, so that the low-pressure area of the mixing chamber 1 and the pressure of the mobile phase form a pressure difference, the mobile phase is pressed into the mixing chamber 1 through the empty suction pipe 6, the quantity of the mobile phase entering the mixing chamber 1 depends on the pressure difference, and the fog output quantity of the atomizer can be controlled by changing the pressure difference; the mobile phase is driven by pressure to enter the mixing chamber 1, liquid drops are sprayed out of the micropores 5 on the pipe wall of the mixing chamber 1, and the liquid drops are mixed with high-speed airflow and enter the diffuser pipe 4; the velocity of flow of gas at the outlet of the spray pipe is lower than the critical velocity of flow, then the air current that gets into the diffuser pipe is subsonic air current, and the air current of spouting from diffuser pipe 4 is also subsonic air current, and the atomizing air current passes through the adiabatic compression of diffuser pipe 4, and the speed reduction pressurization intensifies, and is straight, even from the diffuser pipe, and stable blowout gets into the drift tube.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although the terms mixing chamber 1, tapered nozzle 2, gas circuit connection 3, diffuser tube 4, micro-orifice 5, suction tube 6, three-way valve 7, liquid inlet 71, liquid outlet 72, bypass 73, atomizer housing 8, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.

Claims

1. The utility model provides a dedicated atomizer of evaporative light scattering detector, its characterized in that, this atomizer includes mixing chamber (1), mixing chamber (1) entry end be linked together through convergent spray tube (2) and air circuit joint (3), air circuit joint (3) connect at convergent spray tube (2) entry end, mixing chamber (1) entry end is connected to convergent spray tube (2) exit end, mixing chamber (1) exit end be connected with diffuser pipe (4) entry end, just diffuser pipe (4) exit end link to each other with the drift tube, mixing chamber (1) outside micropore (5) have, just mixing chamber (1) link to each other with air suction pipe (6) one end through micropore (5), just air suction pipe (6) the other end and be located three-way valve (7) of mixing chamber (1) below and link to each other.

2. An atomizer for an evaporative light scattering detector as claimed in claim 1, wherein said three-way valve (7) has an inlet (71) for the inflow of mobile phase and an outlet (72) for the outflow of waste liquid, and said suction tube (6) is connected to a bypass (73) of the three-way valve (7).

3. The atomizer as claimed in claim 1, wherein the gas line connector (3) is connected to a gas source end, the gas source end is any one of an air compressor, a gas generator and a gas bomb, the gas in the gas source end is any one or a combination of air, nitrogen and helium, the gas pressure is not more than 5Mpa, and the flow rate is not more than 10m 3/min.

4. The atomizer of claim 1, 2 or 3, wherein the cross-sectional area of the tapered nozzle (2) gradually decreases from the inlet end to the outlet end, and any cross-sectional diameter of the tapered nozzle (2) conforms to the Witoshiba curve, the diameter of the inlet end of the tapered nozzle (2) is 3.2mm to 8.0mm, the diameter of the outlet end of the tapered nozzle is 2.0mm to 7.4mm, and the length of the tapered nozzle is 1.0mm to 10.0 mm.

5. The atomizer of claim 4, wherein the diameter of any cross section of the mixing chamber (1) is constant, and the diameter of the inlet end or the outlet end of the mixing chamber (1) is 2.0mm to 7.4mm, the length is 0.5mm to 5.0mm, the micropores (5) are arranged on the middle tube wall of the mixing chamber (1), and the diameter of the micropores (5) is 0.1mm to 1.0 mm.

6. A nebulizer as claimed in claim 4, wherein the diameter of any cross section of the hollow pipette (6) is constant, and the diameter is 0.1mm to 1.0mm, and the length is 20mm to 200 mm.

7. The atomizer according to claim 4, wherein the cross-sectional area of the diffuser tube (4) gradually increases from the inlet end to the outlet end, the diameter of the inlet end of the diffuser tube (4) is 2.0mm to 7.4mm, the length of the diffuser tube (4) is 1.0mm to 20.0mm, and the half divergence angle is 10 ° to 45 °.

8. The atomizer according to claim 4, further comprising an atomizer base (8), wherein the tapered nozzle (2), the mixing chamber (1) and the diffuser tube (4) are coaxially disposed and formed in the atomizer base (8), and the gas circuit connector (3) is disposed outside the atomizer base (8).

9. The atomizer special for an evaporative light-scattering detector as claimed in claim 8, wherein one end of the hollow suction tube (6) is inserted into the atomizer base (8) and is connected to the mixing chamber (1), and the other end extends to the outside of the atomizer base (8) and is connected to the three-way valve (7).