CN216926315U - Four-stage cold trap atmosphere pre-concentration instrument - Google Patents
Four-stage cold trap atmosphere pre-concentration instrument Download PDFInfo
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- CN216926315U CN216926315U CN202220219688.2U CN202220219688U CN216926315U CN 216926315 U CN216926315 U CN 216926315U CN 202220219688 U CN202220219688 U CN 202220219688U CN 216926315 U CN216926315 U CN 216926315U
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Abstract
The application provides a level four cold trap atmosphere preconcentrator. The four-stage cold trap atmosphere preconcentrator comprises an air inlet mechanism, an air inlet and an accommodating cavity, wherein the air inlet mechanism is provided with an air inlet and an accommodating cavity which are communicated; the adsorption mechanism comprises a first adsorption trap, a second adsorption trap, a middle tube body, a third adsorption trap and a fourth adsorption trap, wherein the air inlet end of the first adsorption trap is communicated with the accommodating cavity, the air outlet end of the first adsorption trap is respectively communicated with the second adsorption trap and the middle tube body, and the two ends of the middle tube body are respectively communicated with the air inlet end and the air outlet end of the second adsorption trap; a communication collection point is formed at the communication position of the middle pipe body and the air outlet end of the second adsorption trap, the communication collection point is communicated with a third adsorption trap, and the third adsorption trap is communicated with a fourth adsorption trap; and the exhaust mechanism is communicated with the communication collection point. The adsorption of high-carbon compounds and the water removal are respectively carried out in the first adsorption trap and the second adsorption trap, so that the contradiction that the four-stage cold trap atmosphere preconcentrator needs water removal without loss of the high-carbon compounds is solved, and a better water removal effect is achieved.
Description
Technical Field
The utility model relates to the field of chemical analysis, in particular to a four-stage cold trap atmospheric preconcentrator
Background
And in the Voc sample treatment process, a three-stage cold trap atmosphere pre-concentrator is adopted for treatment. Because the sample gas has a certain humidity, and the water in the sample gas has a great influence on the service life of the mass spectrum filament and the service life of the chromatographic column, etc., namely the water in the sample gas can reduce the service life of the mass spectrum filament and the service life of the chromatographic column. Although the water in the sample is removed by the traditional three-stage cold trap atmosphere preconcentrator, the water removal principle is that water-cooling frozen ice is trapped, at the moment, the high-carbon compound in the Voc sample is also trapped, and then the temperature is raised to transfer the high-carbon compound out, so that the water in the sample is removed. However, if the temperature rise during the transfer of the high-carbon compounds is higher, the water is also partially gasified, so that the water removal effect of the three-stage cold trap atmospheric preconcentrator is poor; on the contrary, if the temperature rise during transferring the high-carbon compound is low, the high-carbon compound is retained in the three-stage cold trap atmosphere preconcentrator, so that the peak of the high-carbon compound in the sample is very short or even completely absent, and the accuracy of sample detection is affected.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art and provides a four-stage cold trap atmospheric preconcentrator with a good water removal effect.
The purpose of the utility model is realized by the following technical scheme:
a four-stage cold trap atmospheric preconcentrator comprising:
the air inlet mechanism is provided with an air inlet and an accommodating cavity which are communicated;
the adsorption mechanism comprises a first adsorption trap, a second adsorption trap, a middle tube body, a third adsorption trap and a fourth adsorption trap, wherein the air inlet end of the first adsorption trap is communicated with the accommodating cavity, the air outlet end of the first adsorption trap is respectively communicated with the second adsorption trap and the middle tube body, and the two ends of the middle tube body are respectively communicated with the air inlet end and the air outlet end of the second adsorption trap; a communicated junction is formed at the communicated position of the middle tube body and the air outlet end of the second adsorption trap, the communicated junction is communicated with the third adsorption trap, and the third adsorption trap is communicated with the fourth adsorption trap;
and the exhaust mechanism is communicated with the communication collection point.
In one embodiment, the air inlet mechanism comprises an air inlet pipe and an air mixing structure, the air inlet is arranged at one end of the air inlet pipe, which is far away from the air mixing structure, and the accommodating cavity is arranged in the air mixing structure.
In one embodiment, the number of the gas inlet pipes is at least four, and each gas inlet pipe is communicated with the gas mixing structure;
the four-stage cold trap atmosphere pre-concentration instrument further comprises at least four air inlet control valves, and each air inlet control valve is arranged in one air inlet pipe.
In one embodiment, the adsorption mechanism further comprises a flow-splitting three-way valve, a first end of the flow-splitting three-way valve is communicated with the gas outlet end of the first adsorption trap, a second end of the flow-splitting three-way valve is communicated with the gas inlet end of the second adsorption trap, and a third end of the flow-splitting three-way valve is communicated with the intermediate pipe body.
In one embodiment, the four-stage cold trap atmosphere preconcentrator further comprises a multi-way valve, and the multi-way valve is respectively communicated with the communication collection point, the third adsorption trap and the fourth adsorption trap.
In one embodiment, the multi-way valve is also in communication with the exhaust mechanism such that the exhaust mechanism is in communication with the communication collection point.
In one embodiment, a first air receiving port, a second air receiving port, a third air receiving port, a fourth air receiving port, a fifth air receiving port and a sixth air receiving port are arranged in the multi-way valve, the first air receiving port is communicated with the communication and collection point, the second air receiving port is respectively communicated with the first air receiving port and the third adsorption trap, the third air receiving port is respectively communicated with the fourth air receiving port and the fourth adsorption trap, the fourth air receiving port is further used for being communicated with a carrier gas port, the fifth air receiving port is respectively communicated with the third adsorption trap and the sixth air receiving port, and the sixth air receiving port is further communicated with the exhaust mechanism.
In one embodiment, the exhaust mechanism comprises a pressure sensor, a mass flow rate controller, a vacuum pump and a first exhaust pipeline, wherein the air inlet end of the mass flow rate controller is communicated with the communication collection point, the air outlet end of the mass flow rate controller is communicated with the air exhaust end of the vacuum pump, and the exhaust end of the vacuum pump is communicated with the first exhaust pipeline; the pressure sensor is arranged on a pipeline which is communicated with the mass flow rate controller and the communicating and gathering point.
In one embodiment, the exhaust mechanism further comprises a second exhaust conduit in communication with the communication collection point.
In one embodiment, the exhaust mechanism further comprises an exhaust control valve and an exhaust three-way valve, wherein an air inlet end of the exhaust control valve is communicated with the communication collection point, an air outlet end of the exhaust control valve is communicated with a first end of the exhaust three-way valve, a second end of the exhaust three-way valve is communicated with the second exhaust pipeline, and a third end of the exhaust three-way valve is communicated with an air exhaust end of the mass flow rate controller.
Compared with the prior art, the utility model has at least the following advantages:
the four-stage cold trap atmosphere preconcentrator is provided with an adsorption mechanism, the adsorption mechanism comprises a first adsorption trap, a second adsorption trap, a third adsorption trap and a fourth adsorption trap, the first adsorption trap is mainly used for adsorbing high-carbon compounds, and the second adsorption trap is used for removing water and other gases in a sample and adsorbing low-carbon compounds in the sample, so that the four-stage cold trap atmosphere preconcentrator can achieve a good water removal effect without losing the high-carbon compounds, and the problem that the service life of a mass spectrum filament and the service life of a chromatographic column are reduced by water of sample gas is solved. The third adsorption trap is used for adsorbing and gathering high-carbon compounds in the first adsorption trap and low-carbon compounds in the second adsorption trap, and then all the high-carbon compounds are gathered and transferred to the fourth adsorption trap to be communicated with the gas phase mass spectrometer for detection, so that the problem that the high-carbon compounds in the sample are poor in peak appearance or even cannot be subjected to peak appearance is solved, the overall peak appearance effect of the sample is good, and the accuracy of sample detection is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of a four-stage cold trap atmospheric preconcentrator;
FIG. 2 is a schematic view of a partial structure of a four-stage cold trap atmospheric preconcentrator;
fig. 3 is a partial structure schematic diagram of a four-stage cold trap atmospheric preconcentrator.
Detailed Description
To facilitate an understanding of the utility model, the utility model will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The application provides a four-stage cold trap atmosphere preconcentrator, which comprises an air inlet mechanism, an adsorption mechanism and an exhaust mechanism; the air inlet mechanism is provided with an air inlet and an accommodating cavity which are communicated; the adsorption mechanism comprises a first adsorption trap, a second adsorption trap, a middle tube body, a third adsorption trap and a fourth adsorption trap, wherein the air inlet end of the first adsorption trap is communicated with the accommodating cavity, the air outlet end of the first adsorption trap is respectively communicated with the second adsorption trap and the middle tube body, and the two ends of the middle tube body are respectively communicated with the air inlet end and the air outlet end of the second adsorption trap; a communicating collection point is formed at the communicating position of the middle tube body and the air outlet end of the second adsorption trap, the communicating collection point is communicated with a third adsorption trap, and the third adsorption trap is communicated with a fourth adsorption trap; the exhaust mechanism is communicated with the communication collection point.
Please refer to fig. 1. For a better understanding of the four-stage cold trap atmospheric preconcentrator of the present application, the following further explanation of the four-stage cold trap atmospheric preconcentrator is provided:
the four-stage cold trap atmospheric preconcentrator 10 of one embodiment includes an air intake mechanism 100, an adsorption mechanism 200, and an exhaust mechanism 300. The air inlet mechanism 100 is provided with an air inlet 110 and an accommodating cavity 120 which are communicated with each other. The adsorption mechanism 200 includes a first adsorption trap 210, a second adsorption trap 220, an intermediate tube 230, a third adsorption trap 240 and a fourth adsorption trap 250, an air inlet end of the first adsorption trap 210 is communicated with the accommodating cavity 120, an air outlet end of the first adsorption trap 210 is further communicated with the second adsorption trap 220 and the intermediate tube 230, two ends of the intermediate tube 230 are respectively communicated with an air inlet end and an air outlet end of the second adsorption trap 220, a communication junction 260 is formed at a communication position of the intermediate tube 230 and the air outlet end of the second adsorption trap 220, the communication junction 260 is communicated with the third adsorption trap 240, and the third adsorption trap 240 is communicated with the fourth adsorption trap 250. And an exhaust mechanism 300, wherein the exhaust mechanism 300 is communicated with the communication collection point 260. Because the traditional three-stage cold trap atmosphere pre-concentration instrument removes water and adsorbs high-carbon compounds in the same adsorption trap, a contradiction that the water is removed and the high-carbon compounds are not lost is generated. Therefore, in this embodiment, the four-stage cold trap atmosphere preconcentrator 10 is provided with four adsorption traps, and the adsorption of high carbon compounds and the water removal are performed in the first adsorption trap 210 and the second adsorption trap 220, respectively, so as to solve the contradiction that the four-stage cold trap atmosphere preconcentrator 10 needs not to remove water and not to lose high carbon compounds.
The four-stage cold trap atmosphere preconcentrator 10 is provided with the adsorption mechanism 200, the adsorption mechanism 200 comprises a first adsorption trap 210, a second adsorption trap 220, a third adsorption trap 240 and a fourth adsorption trap 250, the first adsorption trap 210 mainly adsorbs high-carbon compounds, the second adsorption trap 220 mainly removes moisture and other gases in a sample and adsorbs low-carbon compounds in the sample, so that the four-stage cold trap atmosphere preconcentrator 10 can achieve a good water removal effect without losing the high-carbon compounds, and the problem that the water of sample gas can reduce the service life of a mass spectrum filament and the service life of a chromatographic column is solved. The third adsorption trap 240 is used for adsorbing and converging high-carbon compounds in the first adsorption trap 210 and low-carbon compounds in the second adsorption trap 220, and then all the high-carbon compounds are converged and transferred to the fourth adsorption trap 250 to be communicated with a gas phase mass spectrometer for detection, so that the problem that the high-carbon compounds in the sample are short in peak appearance or even completely absent is solved, the overall peak appearance effect of the sample is good, and the accuracy of sample detection is improved.
As shown in fig. 1, in one embodiment, the air inlet mechanism 100 includes an air inlet tube 130 and a gas mixing structure 1210, the air inlet 110 is disposed at an end of the air inlet tube 130 away from the gas mixing structure 1210, and the accommodating cavity 120 is disposed at the gas mixing structure 1210.
As shown in FIG. 1, in one embodiment, the number of the gas inlet tubes 130 is at least four, and each gas inlet tube 130 is in communication with the gas mixing 1210 structure. The four-stage cold trap atmospheric preconcentrator 10 further includes at least four air inlet control valves 140, and each air inlet control valve 140 is disposed in an air inlet pipe 130. It is understood that the four-stage cold trap atmospheric preconcentrator 10 has three inlets 110, including a standard inlet 1110, an internal standard inlet 1120, and a neutral inlet 1130, plus at least one inlet 1140.
As shown in fig. 1, in one embodiment, the adsorption mechanism 200 further includes a three-way valve 270, a first end of the three-way valve 270 is communicated with the gas outlet of the first adsorption trap 210, a second end of the three-way valve 270 is communicated with the gas inlet of the second adsorption trap 220, and a third end of the three-way valve 270 is communicated with the intermediate pipe 230. During the concentration process of the four-stage cold trap atmospheric preconcentrator 10, the first adsorption trap 210 adsorbs the high carbon compounds in the sample and does not adsorb water of the sample, and the water, the low carbon compounds and other gases in the sample flow into the second adsorption trap 220. Therefore, in this embodiment, the four-stage cold trap atmosphere preconcentrator 10 is provided with a shunt three-way valve 270, the shunt three-way valve 270 is closed when the sample gas flows into the first adsorption trap 210, and after the adsorption operation in the first adsorption trap 210 lasts for a period of time, the first end and the second end of the shunt three-way valve 270 are opened, so that the sample gas is transferred into the second adsorption trap 220 to perform the adsorption operation and remove moisture and other gases in the sample. When part of the low carbon compounds in the second adsorption trap 210 is transferred, the third end of the flow-dividing three-way valve 270 is closed, so that part of the low carbon compounds is transferred to the third adsorption trap 240. When transferring the high carbon compound in the first adsorption trap 220, the second end of the diverting three-way valve 270 is closed and the third end of the diverting three-way valve 270 is opened, so that the high carbon compound is transferred to the third adsorption trap 240. At this time, water in the sample gas is retained in the second adsorption trap 220, and other gases are removed because of not being adsorbed during the adsorption operation of the second adsorption trap 220, and all the high-carbon compounds and low-carbon compounds in the sample gas are transferred to the third adsorption trap 240, so that the four-stage cold trap atmosphere preconcentrator 10 does not lose the high-carbon compounds while achieving a good water removal effect, and the accuracy of sample detection is further improved.
As shown in fig. 1, in one embodiment, the four-stage cold trap atmospheric preconcentrator 10 further includes a multi-way valve 400, and the multi-way valve 400 is respectively communicated with the communication collection point 260, the third adsorption trap 240 and the fourth adsorption trap 250.
As shown in FIG. 1, in one embodiment, the multi-way valve 400 is also in communication with the exhaust mechanism 300, placing the exhaust mechanism 300 in communication with the communication collection point 260. The exhaust mechanism 300 can also be directly connected to the connection collection point 260, but because of the large number of air inlets and complex piping in the four-stage atmospheric concentrator 10, the exhaust mechanism 300 is not needed in some of the concentration method steps. Therefore, in the present embodiment, the multi-way valve 400 is communicated with the exhaust mechanism 300, and the connection of the gas path pipeline of the four-stage cold trap atmosphere preconcentrator 10 can be simple and convenient by controlling the multi-way valve 400.
As shown in fig. 1 and 2, in one embodiment, a first air receiving port 410, a second air receiving port 420, a third air receiving port 430, a fourth air receiving port 440, a fifth air receiving port 450 and a sixth air receiving port 460 are arranged in the multi-way valve 400, the first air receiving port 410 is communicated with the communication junction 260, the second air receiving port 420 is communicated with the first air receiving port 410 and the third adsorption trap 240 respectively, the third air receiving port 430 is communicated with the fourth air receiving port 440 and the fourth adsorption trap 250 respectively, the fourth air receiving port 440 is also used for being communicated with the carrier air port 500, the fifth air receiving port 450 is communicated with the third adsorption trap 240 and the sixth air receiving port 460 respectively, and the sixth air receiving port 460 is also communicated with the exhaust mechanism 300. Because the pipeline of the four-stage cold trap atmosphere pre-concentration instrument 10 is provided with a plurality of air inlets and the connection mode is complex. In this embodiment, the four-stage cold trap atmosphere preconcentrator 10 is provided with a multi-way valve 400, the multi-way valve 400 can also change the connection relationship between the first air port 410 and the second air port 420, the connection relationship between the third air port 430 and the fourth air port 440, and the connection relationship between the fifth air port 450 and the sixth air port 460 through rotation, and the positions of the air ports cannot be changed due to the rotation of the multi-way valve 400, that is, the rotation of the multi-way valve 400 only changes the connection relationship between the air ports, so that the connection of the four-stage cold trap atmosphere preconcentrator 10 in the control of the air path pipeline is simpler and more convenient.
As shown in fig. 1 and 3, in one embodiment, the exhaust mechanism 300 includes a pressure sensor 310, a vacuum pump 320, a mass flow rate controller 330, and a first exhaust pipe 340, wherein an air inlet end of the mass flow rate controller 330 is communicated with the communication collection point 260, an air outlet end of the mass flow rate controller 330 is communicated with an air exhaust end of the vacuum pump 320, and an exhaust end of the vacuum pump 320 is communicated with the first exhaust pipe 340; pressure sensor 310 is located on the conduit where mass flow rate controller 330 communicates with communication junction 260. In the present embodiment, the four-stage cold trap atmosphere preconcentrator 10 has an exhaust function capable of being precisely controlled by a combination of the vacuum pump 320, the mass flow rate controller 330 and the first exhaust pipeline 340. The concentration method of the four-stage cold trap atmosphere preconcentrator 10 comprises a step of sample introduction of a sample to be detected, the four-stage cold trap atmosphere preconcentrator 10 performs the exhaust function by selecting the exhaust mechanism 300 of the four-stage cold trap atmosphere preconcentrator 10 while the sample to be detected is introduced, so that the whole pipeline of the four-stage cold trap atmosphere preconcentrator 10 can be in a state of being filled with the sample to be detected, the situation that the sample is polluted is avoided, and the accuracy of sample detection is ensured.
As shown in fig. 1 and 3, in one embodiment, the exhaust mechanism 300 further includes a second exhaust duct 350, the second exhaust duct 350 being in communication with the communication collection point 260. In the present embodiment, the four-stage cold trap atmospheric preconcentrator 10 further has a second exhaust function of directly exhausting through the second exhaust duct 350. The concentration method of the four-stage cold trap atmospheric preconcentrator 10 has a step of sample gas injection. In the sample introduction process of the sample gas, other gases which are not adsorbed by the second adsorption trap in the sample gas can be exhausted through the second exhaust function. Under the condition that can not influence the detection accuracy of sample, the second kind exhaust function is more simple swift to promote the work efficiency of level four cold-trap atmosphere preconcentrator 10.
As shown in fig. 1 and 3, in one embodiment, the exhaust mechanism 300 further includes an exhaust control valve 360 and an exhaust three-way valve 370, wherein an inlet end of the exhaust control valve 360 is communicated with the communication junction 260, an outlet end of the exhaust control valve 360 is communicated with a first end of the exhaust three-way valve 370, a second end of the exhaust three-way valve 370 is communicated with the second exhaust pipe 350, and a third end of the exhaust three-way valve 370 is communicated with a suction end of the mass flow rate controller 330. Because the air channel pipelines of the exhaust mechanism 300 are many, the four-stage cold trap atmosphere preconcentrator 10 is more complex to control the exhaust mechanism 300. In this embodiment, the exhaust mechanism 300 is provided with an exhaust control valve 360 and an exhaust three-way valve 370, the four-stage cold trap atmosphere preconcentrator 10 can control the function operation switch of the exhaust mechanism 300 by controlling the exhaust control valve 360, and the four-stage cold trap atmosphere preconcentrator 10 can select two different exhaust functions by controlling the exhaust three-way valve 370, so that the convenience of the operation of the four-stage cold trap atmosphere preconcentrator 10 is improved, and the working efficiency of the four-stage cold trap atmosphere preconcentrator 10 is further improved.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the utility model, and these changes and modifications are all within the scope of the utility model. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A four-stage cold trap atmospheric preconcentrator, comprising:
the air inlet mechanism is provided with an air inlet and an accommodating cavity which are communicated;
the adsorption mechanism comprises a first adsorption trap, a second adsorption trap, an intermediate tube body, a third adsorption trap and a fourth adsorption trap, wherein the air inlet end of the first adsorption trap is communicated with the accommodating cavity, the air outlet end of the first adsorption trap is respectively communicated with the second adsorption trap and the intermediate tube body, and two ends of the intermediate tube body are respectively communicated with the air inlet end and the air outlet end of the second adsorption trap; a communicated junction is formed at the communicated position of the middle tube body and the air outlet end of the second adsorption trap, the communicated junction is communicated with the third adsorption trap, and the third adsorption trap is communicated with the fourth adsorption trap;
and the exhaust mechanism is communicated with the communication collection point.
2. The four-stage cold trap atmospheric preconcentrator according to claim 1, wherein the gas inlet mechanism comprises a gas inlet pipe and a gas mixing structure, the gas inlet is arranged at one end of the gas inlet pipe far away from the gas mixing structure, and the accommodating cavity is arranged at the gas mixing structure.
3. The four-stage cold trap atmospheric preconcentrator of claim 2, wherein the number of the gas inlet pipes is at least four, and each gas inlet pipe is communicated with the gas mixing structure;
the four-stage cold trap atmosphere pre-concentration instrument further comprises at least four air inlet control valves, and each air inlet control valve is arranged in one air inlet pipe.
4. The four-stage cold trap atmospheric preconcentrator according to claim 1, wherein the adsorption mechanism further comprises a three-way shunt valve, a first end of the three-way shunt valve is communicated with the gas outlet of the first adsorption trap, a second end of the three-way shunt valve is communicated with the gas inlet of the second adsorption trap, and a third end of the three-way shunt valve is communicated with the intermediate pipe body.
5. The four-stage cold trap atmospheric preconcentrator of claim 1, further comprising a multi-way valve in communication with the communication collection point, the third adsorption trap, and the fourth adsorption trap, respectively.
6. The four-stage cold trap atmospheric preconcentrator of claim 5, wherein the multi-way valve is further in communication with the exhaust mechanism such that the exhaust mechanism is in communication with the communication collection point.
7. The four-stage cold trap atmosphere preconcentrator according to claim 6, wherein a first air receiving port, a second air receiving port, a third air receiving port, a fourth air receiving port, a fifth air receiving port and a sixth air receiving port are arranged in the multi-way valve, the first air receiving port is communicated with the communication and collection point, the second air receiving port is communicated with the first air receiving port and the third adsorption trap respectively, the third air receiving port is communicated with the fourth air receiving port and the fourth adsorption trap respectively, the fourth air receiving port is further used for being communicated with a carrier gas port, the fifth air receiving port is communicated with the third adsorption trap and the sixth air receiving port respectively, and the sixth air receiving port is further communicated with the exhaust mechanism.
8. The four-stage cold trap atmospheric preconcentrator of claim 1, wherein the exhaust mechanism comprises a pressure sensor, a mass flow controller, a vacuum pump and a first exhaust conduit, wherein an air inlet end of the mass flow controller is communicated with the communication collection point, an air outlet end of the mass flow controller is communicated with an air exhaust end of the vacuum pump, and an exhaust end of the vacuum pump is communicated with the first exhaust conduit; the pressure sensor is arranged on a pipeline which is communicated with the mass flow rate controller and the communicating and gathering point.
9. The four-stage cold trap atmospheric preconcentrator of claim 8, wherein the exhaust mechanism further comprises a second exhaust conduit in communication with the communication collection point.
10. The four-stage cold trap atmospheric preconcentrator according to claim 9, wherein the exhaust mechanism further comprises an exhaust control valve and an exhaust three-way valve, an air inlet end of the exhaust control valve is communicated with the communication collection point, an air outlet end of the exhaust control valve is communicated with a first end of the exhaust three-way valve, a second end of the exhaust three-way valve is communicated with the second exhaust pipeline, and a third end of the exhaust three-way valve is communicated with an air exhaust end of the mass flow rate controller.
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