CN211263337U - High stability evaporative light scattering detector - Google Patents
High stability evaporative light scattering detector Download PDFInfo
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- CN211263337U CN211263337U CN201922342608.3U CN201922342608U CN211263337U CN 211263337 U CN211263337 U CN 211263337U CN 201922342608 U CN201922342608 U CN 201922342608U CN 211263337 U CN211263337 U CN 211263337U
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Abstract
The utility model discloses a high stability evaporation light scattering detector, including the imaging device, atomizer, drift tube, perk flow dish and the detection device who connects gradually, imaging device is connected with detection device, and the atomizer is connected with the atomizing air inlet pipeline, and the perk flow dish is connected with perk flow air inlet pipeline, and atomizing air inlet pipeline and perk flow air inlet pipeline connect the air supply unit, and the temperature of atomizing air inlet pipeline and perk flow air inlet pipeline is all controllable. The utility model discloses can realize carrying out temperature control's technological effect to the gas that lets in atomizer and upwarp flow tray, effectively improve atomizing stability and testing result's accuracy.
Description
Technical Field
The utility model relates to a technical field of detector, concretely relates to high stability evaporation light scattering detector.
Background
An evaporative light scattering detector is a general purpose type of detector that can detect any sample that is less volatile than the mobile phase without requiring that the sample contain chromophoric groups. The evaporative light scattering detector has higher sensitivity than a differential refractive detector, is insensitive to temperature change, has stable base line, and is suitable for being combined with gradient elution liquid chromatography. Evaporative light scattering detectors have been widely used for the detection of carbohydrates, lipids, fatty acids and amino acids, drugs, polymers, and the like. The unique detection principle of the evaporative light scattering detector is as follows: the column eluent is first atomized to form aerosol, the solvent is then evaporated in a heated drift tube, and the remaining non-volatile solute particles are finally detected in a light scattering detection cell. 1. Atomizing: the liquid mobile phase is converted into fine liquid drops in the atomizing chamber under the action of the carrier gas pressure, so that the solvent is easier to evaporate. The size and uniformity of the droplets are important factors in ensuring the sensitivity and repeatability of the detector. The evaporation light scattering detector ensures that a narrower droplet size distribution is formed in the atomizing chamber by accurately controlling the air pressure and the temperature, so that the temperature required by droplet evaporation is greatly reduced. 2. And (3) evaporation: the carrier gas carries the droplets from the atomization chamber to the drift tube for evaporation. In the drift tube, the solvent is removed, leaving droplets of fine particles or pure solute. The evaporative light scattering detector adopts a low-temperature evaporation mode, maintains the uniformity of particles, and has good sensitivity to semi-volatile substances and heat-sensitive compounds. 3. And (3) detection: the light source adopts laser, and solute particles enter the light detection pool after coming out of the drift tube and pass through the laser beam. Light scattered by solute particles passes through the photodetector element and is collected. The solute particles are enveloped by the auxiliary carrier gas when entering the light detection pool, so that the dispersion and the deposition of the solute in the detection pool on the wall are avoided, the detection sensitivity is greatly enhanced, and the pollution on the surface of the detection pool is greatly reduced.
Chinese patent database discloses that publication number is CN207866768U, the name is an evaporation light scattering detection device's utility model patent, but the evaporation light scattering detector that this patent was published does not solve the problem to stable accuse temperature, especially to letting in the unable stable accuse temperature of gas wherein, will finally lead to under long-time measuring, because the big scheduling factor of difference in temperature round the clock, lead to the unable invariable temperature that keeps of gas in the instrument, influence atomizing stability, influence the testing result.
SUMMERY OF THE UTILITY MODEL
In view of the not enough of background art, the utility model provides a high stability evaporation light scattering detector, the technical problem of its solution is how to carry out temperature control to the gas that lets in upwarp flow dish and atomizer.
For solving the technical problem, the utility model provides a following technical scheme:
high stability evaporation light scattering detector, including imaging device, atomizer, drift tube, perk flow dish and the detection device who connects gradually, imaging device is connected with detection device, and the atomizer is connected with the atomizing air inlet pipeline, and the perk flow dish is connected with perk flow air inlet pipeline, and atomizing air inlet pipeline and perk flow air inlet pipeline connect the air supply unit, and the atomizing air inlet pipeline all is controllable with the temperature of perk flow air inlet pipeline.
The tilted flow air inlet pipeline comprises an A pipe, a B pipe, a D pipe and an E pipe, the atomization air inlet pipeline comprises a C pipe, an F pipe and a G pipe, wherein the air source device is connected with the A pipe, a first gas mass flow controller is arranged on the A pipe and connected with a gas pressure sensor, the A pipe is respectively connected with the B pipe and the C pipe through a first three-way pipe, the B pipe is connected with a gas flow regulating device, the B pipe is respectively connected with the D pipe and the E pipe, and the D pipe and the E pipe are connected with a tilted flow disc; the pipe C is respectively connected with the pipe F and the pipe G, and the pipe F and the pipe G are connected with the atomizer.
The tilted flow air inlet pipeline comprises an H pipe, an I pipe, a K pipe and an L pipe, the atomization air inlet pipeline comprises a J pipe, an M pipe and an N pipe, wherein the air source device is connected with the H pipe, the H pipe is respectively connected with the I pipe and the J pipe through a second three-way pipe, a second gas mass flow controller is arranged on the I pipe and is connected with a first pressure sensor, the I pipe is respectively connected with the K pipe and the L pipe, and the K pipe and the L pipe are connected with a tilted flow disc; and the J pipe is provided with a third gas mass flow controller and connected with a second pressure sensor, the J pipe is respectively connected with the M pipe and the N pipe, and the M pipe and the N pipe are connected with the atomizer.
Heating belts are arranged on the upwarp air inlet pipeline and the atomization air inlet pipeline respectively and connected with a heating device.
The whole high-stability evaporative light scattering detector is placed in a constant temperature device.
A temperature control box is connected between the pipe A and the first three-way pipe, and a channel for air to pass through is arranged in the temperature control box.
And a temperature control box is also connected between the H pipe and the second three-way pipe, and a channel for gas to pass through is arranged in the temperature control box.
The temperature control box comprises a box body, a heating sheet is attached to the box body, the box body is wrapped in a heat insulation layer, and a temperature sensor and an over-temperature protector are arranged in a channel of the box body.
Compared with the prior art, the utility model beneficial effect who has is: the utility model discloses can realize carrying out temperature control's technological effect to the gas that lets in the atomizer and the upwarp flow tray, effectively improve atomizing stability and testing result's accuracy.
Drawings
The utility model discloses there is following figure:
fig. 1 is a schematic view of embodiment 1 of the present invention;
fig. 2 is a partial schematic view of the pipe a of the present invention having a heating band connected to a heating device;
fig. 3 is a schematic view of embodiment 2 of the present invention;
fig. 4 is a schematic view of embodiment 3 of the present invention;
fig. 5 is a schematic view of embodiment 4 of the present invention;
in the figure: the device comprises an imaging device 1, an atomizer 2, a drift tube 3, a tilting tray 4, a detection device 5, a tube A6, a tube B7, a tube D8, a tube E9, a tube C10, a tube F11, a tube G12, a first gas mass flow controller 13, a gas flow regulating device 14, a heating belt 15, a gas source device 16, a heating device 17, a tube H18, a tube I19, a tube K20, a tube L21, a tube J22, a tube M23, a tube N24, a second gas mass flow controller 25, a first pressure sensor 26, a third gas mass flow controller 27, a second pressure sensor 28, an atomizing tube 29, a gas pressure sensor 30, a constant temperature device 31, a temperature sensor 33, an over-temperature protector 34, a heating sheet 35, a first three-way tube 36 and a second three-way tube 37.
Detailed Description
Example 1:
as shown in fig. 1-2, the high-stability evaporative light scattering detector in this embodiment includes an imaging device 1, an atomizer 2, a drift tube 3, a tilted flow plate 4, and a detection device 5, which are connected in sequence, wherein the atomizer 2 and the drift tube 3 are connected by an atomization tube 29. Imaging device 1 is connected with detection device 5, and atomizer 2 is connected with the atomizing air inlet pipeline, and tilted flow dish 4 is connected with tilted flow air inlet pipeline, and atomizing air inlet pipeline and tilted flow air inlet pipeline connect air supply unit 16, and air supply unit 16 provides the compressed air or the high-purity nitrogen gas of dehydration, and the atomizing air inlet pipeline is all controllable with tilted flow air inlet pipeline's temperature.
Specifically, the connection mode of the tilted flow air inlet pipeline and the atomization air inlet pipeline with the air source device 16 is as follows: the tilted flow air inlet pipeline comprises an A pipe 6, a B pipe 7, a D pipe 8 and an E pipe 9, the atomization air inlet pipeline comprises a C pipe 10, an F pipe 11 and a G pipe 12, wherein an air source device 16 is connected with the A pipe 6, a first gas mass flow controller 13 is arranged on the A pipe 6 and is connected with a gas pressure sensor 30, the A pipe 6 is respectively connected with the B pipe 7 and the C pipe 10 through a first tee joint 36, the B pipe 7 is connected with a gas flow regulating device 14, the gas flow regulating device 14 can adopt a gas regulating valve or a capillary shunt damper, the B pipe 7 is respectively connected with the D pipe 8 and the E pipe 9 through a three-way pipe, and the D pipe 8 and the E pipe 9 are connected with the tilted flow disc 4; the pipe C10 is respectively connected with the pipe F11 and the pipe G12 through a three-way pipe, and the pipe F11 and the pipe G12 are connected with the atomizer 2. Through the structure, the gas flow introduced into the tilted flow disc 4 and the atomizer 2 can be controlled, particularly, the gas for conveying the tilted flow disc 4 can be reduced, more gas is conveyed to the atomizer 2, and a better detection effect is realized.
In this embodiment, the tube a 6, the tube B7, the tube D8, the tube E9, the tube C10, the tube F11, the tube G12, and all the three-way pipes used are made of a non-metal material with certain heat insulation performance, and because the non-metal material has good heat insulation performance, the non-metal material can effectively prevent the heat loss of gas, and ensure that the gas is controlled at a specified temperature.
The temperature control method of the atomization air inlet pipeline and the tilted flow air inlet pipeline comprises the following steps: heating belts 15 are respectively wound on the tilted flow air inlet pipelines, namely the pipe A6, the pipe B7, the pipe D8 and the pipe E9, the atomization air inlet pipelines, namely the pipe C10, the pipe F11 and the pipe G12 are also respectively wound with the heating belts 15, and the heating belts 15 are connected with a heating device 17, such as a heating box. The heating belt 15 is heated by the heating device 17 and kept at a constant temperature, and then the heating belt 15 heats and keeps constant temperature of the tilted flow air inlet pipelines, namely the pipe A6, the pipe B7, the pipe D8 and the pipe E9, and the atomization air inlet pipelines, namely the pipe C10, the pipe F11 and the pipe G12, so that the constant temperature control of the gas in the atomization air inlet pipelines and the tilted flow air inlet pipelines is realized. Fig. 2 shows a schematic view of a heating tape 15 wound around the tube a 6, in which the heating tape 15 is connected to a heating device 17, and the remaining tubes B, D, E, C, F, and G7, 8, 9, 10, 11, and 12 are wound around the heating tape 15 as the tube a.
Example 2:
as shown in fig. 3, the structure of embodiment 2 is the same as that of embodiment 1 except for the following structure:
a temperature control box is connected between the pipe a and the first three-way pipe 36, and a passage for gas to pass through is arranged in the temperature control box.
The temperature control box comprises a box body 32, a heating sheet 35 is attached to the box body 32, the box body 32 is wrapped in a heat insulation layer, and a temperature sensor 33 and an over-temperature protector 34 are arranged in the box body 32. Through this structure can heat the accuse temperature to the gas that passes through in the accuse temperature case, through temperature sensor 33 the temperature of being convenient for control, can be through the automatic power off of excess temperature protector 34 when the high temperature, guarantee the security of equipment.
Through this kind of structure, can realize heating the accuse temperature to the gas that lets in B pipe 7 and C pipe 10, because D pipe 8, E pipe 9, F pipe 11 and G pipe 12 have the heat-proof quality, so the gas after 7 and C pipe 10 heats lets in D pipe 8, E pipe 9, F pipe 11 and G pipe 12, and the temperature still can keep invariable. And then realize the temperature control effect to the gas.
Example 3:
as shown in fig. 4, in the high-stability evaporative light scattering detector in this embodiment, the connection manner of the imaging device 1, the atomizer 2, the drift tube 3, the tilted flow tray 4 and the detection device 5 is the same as that in embodiment 1, except that the manner of controlling the air flow rates entering the atomizer 2 and the tilted flow tray 4 is different from the manner of controlling the temperatures of the atomization air inlet pipeline and the tilted flow air inlet pipeline.
Specifically, the connection mode of the tilted flow air inlet pipeline and the atomization air inlet pipeline with the air source device 16 is as follows: the tilted flow air inlet pipeline comprises an H pipe 18, an I pipe 19, a K pipe 20 and an L pipe 21, the atomization air inlet pipeline comprises a J pipe 22, an M pipe 23 and an N pipe 24, wherein the air source device 16 is connected with the H pipe 18, the H pipe 18 is respectively connected with the I pipe 19 and the J pipe 22 through a second three-way pipe 37, a second air mass flow controller 25 is arranged on the I pipe 19 and is connected with a first pressure sensor 26, the I pipe 19 is respectively connected with the K pipe 20 and the L pipe 21 through a three-way pipe, and the K pipe 20 and the L pipe 21 are connected with the tilted flow disc 4; the J pipe 22 is provided with a third gas mass flow controller 27 and is connected with a second pressure sensor 28, the J pipe 22 is respectively connected with the M pipe 23 and the N pipe 24 through a three-way pipe, and the M pipe 23 and the N pipe 24 are connected with the atomizer 2. Wherein, the I pipe 19, the J pipe 22, the K pipe 20, the L pipe 21, the M pipe 23 and the N pipe 24 are all made of heat insulation materials. Compared with the structure of the embodiment 1, the structure does not need the gas flow adjusting device 14, and the gas introduced into the up-flow plate 4 is more accurate, but the cost is correspondingly increased compared with the embodiment 1 due to the addition of the gas mass flow controller and the two pressure sensors, and the cost performance of the embodiment 1 is higher.
In this embodiment, the temperatures of the atomizing air inlet pipeline and the tilted flow air inlet pipeline are controlled as follows: the entire high stability evaporative light scattering detector is placed in a thermostated temperature controlled device 31, which may also be placed in a device with good thermal insulation properties. By the method, each part of the whole device can be under a constant temperature adjusting part, so that the atomization air inlet pipeline and the tilted flow air inlet pipeline are further under constant temperature control, and the air passing through the atomization air inlet pipeline and the tilted flow air inlet pipeline is also under constant temperature control.
Example 4:
as shown in fig. 5, the structure of embodiment 4 is the same as that of embodiment 3 except for the following structure:
and a temperature control box is also connected between the H pipe and the second three-way pipe, and a channel for gas to pass through is arranged in the temperature control box. The structure of the temperature control box is the same as that of the temperature control box of embodiment 2.
Through the structure, the gas introduced into the I pipe 19 and the J pipe 22 can be heated and controlled, and the K pipe 20, the L pipe 21, the M pipe 23 and the N pipe 24 also have heat insulation performance, so that the temperature can be kept constant after the gas heated by the I pipe 19 and the J pipe 22 is introduced into the K pipe 20, the L pipe 21, the M pipe 23 and the N pipe 24. And then realize the temperature control effect to the gas.
Although the specific structures and the connection modes of the two embodiments are different, the technical effects of controlling the temperature of the gas introduced into the atomizer 2 and the tilted flow disc 4 can be achieved, and the stability of atomization and the accuracy of detection results are effectively improved. In the concrete experiment, compare traditional evaporative light scattering detector with the utility model discloses an evaporative light scattering detector, discover that traditional evaporative light scattering detector will deviate after carrying out 15 the same long-time experiments, there is the unstable phenomenon of testing result; and the utility model discloses an even carry out 46 times the long-time experiment the same with the former, still can guarantee that the result is all stable at every turn, testified the utility model discloses the effect that gains is showing.
Claims (8)
1. High stability evaporation light scattering detector, including imaging device, atomizer, drift tube, perk flow tray and the detection device who connects gradually, imaging device is connected with detection device, and the atomizer is connected with the atomizing air inlet pipeline, and the perk flow tray is connected with perk flow air inlet pipeline, its characterized in that: the atomization air inlet pipeline and the tilted flow air inlet pipeline are connected with an air source device, and the temperatures of the atomization air inlet pipeline and the tilted flow air inlet pipeline are controllable.
2. The high stability evaporative light scattering detector of claim 1, wherein: the tilted flow air inlet pipeline comprises an A pipe, a B pipe, a D pipe and an E pipe, the atomization air inlet pipeline comprises a C pipe, an F pipe and a G pipe, wherein the air source device is connected with the A pipe, a first gas mass flow controller is arranged on the A pipe and connected with a gas pressure sensor, the A pipe is respectively connected with the B pipe and the C pipe through a first three-way pipe, the B pipe is connected with a gas flow regulating device, the B pipe is respectively connected with the D pipe and the E pipe, and the D pipe and the E pipe are connected with a tilted flow disc; the pipe C is respectively connected with the pipe F and the pipe G, and the pipe F and the pipe G are connected with the atomizer.
3. The high stability evaporative light scattering detector of claim 1, wherein: the tilted flow air inlet pipeline comprises an H pipe, an I pipe, a K pipe and an L pipe, the atomization air inlet pipeline comprises a J pipe, an M pipe and an N pipe, wherein the air source device is connected with the H pipe, the H pipe is respectively connected with the I pipe and the J pipe through a second three-way pipe, a second gas mass flow controller is arranged on the I pipe and is connected with a first pressure sensor, the I pipe is respectively connected with the K pipe and the L pipe, and the K pipe and the L pipe are connected with a tilted flow disc; and the J pipe is provided with a third gas mass flow controller and connected with a second pressure sensor, the J pipe is respectively connected with the M pipe and the N pipe, and the M pipe and the N pipe are connected with the atomizer.
4. A high stability evaporative light scattering detector as claimed in any of claims 1 to 3, wherein: heating belts are arranged on the upwarp air inlet pipeline and the atomization air inlet pipeline respectively and connected with a heating device.
5. A high stability evaporative light scattering detector as claimed in any of claims 1 to 3, wherein: the whole high-stability evaporative light scattering detector is placed in a constant temperature device.
6. The high stability evaporative light scattering detector of claim 2, wherein: a temperature control box is connected between the pipe A and the first three-way pipe, and a channel for air to pass through is arranged in the temperature control box.
7. The high stability evaporative light scattering detector of claim 3, wherein: and a temperature control box is also connected between the H pipe and the second three-way pipe, and a channel for gas to pass through is arranged in the temperature control box.
8. The high stability evaporative light scattering detector of claim 6 or 7, wherein: the temperature control box comprises a box body, a heating sheet is attached to the box body, the box body is wrapped in a heat insulation layer, and a temperature sensor and an over-temperature protector are arranged in a channel of the box body.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922342608.3U CN211263337U (en) | 2019-12-23 | 2019-12-23 | High stability evaporative light scattering detector |
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| CN201922342608.3U CN211263337U (en) | 2019-12-23 | 2019-12-23 | High stability evaporative light scattering detector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110907573A (en) * | 2019-12-23 | 2020-03-24 | 无锡赛那尔仪器设备制造有限公司 | High stability evaporative light scattering detector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110907573A (en) * | 2019-12-23 | 2020-03-24 | 无锡赛那尔仪器设备制造有限公司 | High stability evaporative light scattering detector |
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