CN210720286U

CN210720286U - Sweeping and trapping device

Info

Publication number: CN210720286U
Application number: CN201921675440.1U
Authority: CN
Inventors: 吴得福; 臧远泽; 王超; 任娜; 高心岗; 杨立杰
Original assignee: Qingdao Jiaming Measurement And Control Technology Co ltd
Current assignee: Qingdao Jiaming Measurement And Control Technology Co ltd
Priority date: 2019-10-09
Filing date: 2019-10-09
Publication date: 2020-06-09
Anticipated expiration: 2029-10-09

Abstract

The utility model discloses a sweeping and trapping device, which comprises a first air carrying pipe, wherein the bottom of the first air carrying pipe is communicated with a sweeping pipe, the other end of the sweeping pipe is communicated with a stainless steel pipeline, the left end of the stainless steel pipeline is communicated with a nafion pipe, the left end of the nafion pipe is communicated with a first electromagnetic three-way valve through the stainless steel pipeline, the left end of the first electromagnetic three-way valve is communicated with a trapping mechanism through the stainless steel pipeline, the left end of the trapping mechanism is communicated with a second electromagnetic three-way valve through the stainless steel pipeline, the bottom end of the second electromagnetic three-way valve is communicated with an air outlet through the stainless steel pipeline, and the top of the second electromagnetic three-way valve is communicated with a second air carrying pipe; through having designed the nafion pipe of installing in the stainless steel pipeline left end, the effectual carrier that has absorbed adulterated moisture to reduce the pollution, had sustainable use and the obvious advantage of result of use.

Description

Sweeping and trapping device

Technical Field

The utility model relates to an important matching equipment of organic matter pretreatment in the chromatographic analysis specifically is a sweeping and trapping device.

Background

The purging and trapping technology is suitable for extracting volatile or semi-volatile organic compounds with the boiling point lower than 200 ℃ and the solubility lower than 2 percent from liquid or solid samples, and is widely applied to the aspects of food and environment monitoring, clinical assay and the like.

Although the purging and trapping device disclosed in the publication No. CN101893613B can concentrate volatile organic compounds and be directly used for chromatographic analysis, the purging and trapping device has the advantages of convenient use and high concentration efficiency, but does not solve the problem that the carrier gas carries the volatile organic compounds and is doped with moisture to cause pollution, and the carrier gas cannot sufficiently carry the volatile organic compounds out of the water sample to reduce the concentration amount.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

An object of the utility model is to provide a sweeping entrapment device to the carrier gas of proposing in solving above-mentioned background art is still doping moisture when carrying volatile organic compounds, leads to the production of pollution, but also has the carrier gas and can't fully take out volatile organic compounds when the water sample, thereby has reduced the problem of concentration volume.

(II) technical scheme

In order to achieve the above object, the utility model provides a following technical scheme: a purging and trapping device comprises a first gas carrying pipe, wherein the bottom of the first gas carrying pipe is communicated with a purging pipe, the other end of the purging pipe is communicated with a stainless steel pipeline, the left end of the stainless steel pipeline is communicated with a nafion pipe, the left end of the nafion pipe is communicated with a first electromagnetic three-way valve through the stainless steel pipeline, the left end of the first electromagnetic three-way valve is communicated with a trapping mechanism through the stainless steel pipeline, the left end of the trapping mechanism is communicated with a second electromagnetic three-way valve through the stainless steel pipeline, the bottom end of the second electromagnetic three-way valve is communicated with an exhaust port through the stainless steel pipeline, the top of the second electromagnetic three-way valve is communicated with a second gas carrying pipe, and the top of the first electromagnetic three-way valve is communicated with an inlet of a gas chromatograph through the stainless steel pipeline.

Preferably, the trapping mechanism comprises a trapping pipe, an adsorbent is arranged in the trapping pipe, a first heating wire is wound on the surface of the trapping pipe, a heat dissipation plate is mounted on the back surface of the trapping pipe, and a heat dissipation fan is fixedly mounted at the top of the heat dissipation plate.

Preferably, the adsorbent includes A type adsorbent, B type adsorbent and C type adsorbent, A type adsorbent, B type adsorbent and C type adsorbent set gradually from the right side to the left side in the collecting pipe, and the adsorption efficiency of A type adsorbent, B type adsorbent and C type adsorbent strengthens in proper order, A type adsorbent, B type adsorbent and C type adsorbent are

poly

2, 6 diphenyl p-phenylene ether, silica gel and carbon molecular sieve respectively.

Preferably, the collecting pipe is made of glass, the outer diameter of the collecting pipe is 6.5mm, the right end and the left end of the collecting pipe are respectively a thin opening end and a thick opening end, and the inner diameters of the thin opening end and the thick opening end of the collecting pipe are respectively 1mm and 3.9 mm.

Preferably, the shape of the purging pipe is U-shaped, and the surface of the purging pipe is wound with the second heating wire.

Preferably, the inside of sweeping the pipe is provided with quartz sieve board and temperature sensor respectively, a plurality of through-hole has been seted up at the top of quartz sieve board.

Advantageous effects

Compared with the prior art, the utility model provides a sweeping and trapping device possesses following beneficial effect:

1. through having designed the nafion pipe of installing in the stainless steel pipeline left end, the effectual moisture that has absorbed in the carrier of nafion pipe to reduce the pollution, had sustainable use and the obvious advantage of result of use.

2. Install the second heater strip that twines on sweeping the pipe surface through having designed, the second heater strip can heat the water sample to the reaction of carrier gas and water sample has been catalyzed, volatile organic compounds in the water sample of taking over that makes the carrier gas can be abundant.

3. By designing the collecting pipe arranged at the left end of the first electromagnetic three-way valve, the thin opening end of the collecting pipe enables the carrier gas flow to be thin and fast, the peak of the chromatograph is sharp, narrow and free of tail supporting, and the phenomenon of peak broadening is reduced.

4. Through having designed the adsorbent of installing in the trap intraduct, the organic matter in the adsorbable carrier gas of adsorbent, the adsorbent of different intensity can make the organic matter prevent to be adsorbed repeatedly when thermal analysis, and the phenomenon of being analyzed appears.

Drawings

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

FIG. 2 is a schematic cross-sectional view of a portion of the purge tube of the present invention;

FIG. 3 is a schematic top view of a quartz screen deck according to the present invention;

FIG. 4 is an enlarged view of the point A of FIG. 1 according to the present invention;

FIG. 5 is a schematic cross-sectional view of the trap of the present invention;

in the figure: 1. a first carrier gas pipe; 2. a purge tube; 3. a stainless steel pipeline; 4. a nafion tube; 5. a first electromagnetic three-way valve; 6. a trapping mechanism; 61. collecting pipes; 62. an adsorbent; 621. a type A adsorbent; 622. a type B adsorbent; 623. a type C adsorbent; 63. a first heater wire; 64. a heat dissipation plate; 65. a heat radiation fan; 7. a second electromagnetic three-way valve; 8. an exhaust port; 9. a second carrier gas pipe; 10. a second heating wire; 11. a quartz sieve plate; 12. a temperature sensor.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1-5, the utility model provides a technical solution: a purging and trapping device comprises a first gas carrying pipe 1, a purging pipe 2 is communicated with the bottom of the first gas carrying pipe 1, the other end of the purging pipe 2 is communicated with a stainless steel pipeline 3, the left end of the stainless steel pipeline 3 is communicated with a nafion pipe 4, the left end of the nafion pipe 4 is communicated with a first electromagnetic three-way valve 5 through the stainless steel pipeline 3, the left end of the first electromagnetic three-way valve 5 is communicated with a trapping mechanism 6 through the stainless steel pipeline 3, the left end of the trapping mechanism 6 is communicated with a second electromagnetic three-way valve 7 through the stainless steel pipeline 3, the bottom end of the second electromagnetic three-way valve 7 is communicated with an exhaust port 8 through the stainless steel pipeline 3, the top of the second electromagnetic three-way valve 7 is communicated with a second gas carrying pipe 9, the top of the first electromagnetic three-way valve 5 is communicated with an inlet of a gas chromatograph through the stainless steel pipeline 3, and pollution and full concentration of organic matters.

Referring to fig. 4, in order to collect organic substances, the collecting mechanism 6 includes a collecting pipe 61, an adsorbent 62 is disposed inside the collecting pipe 61, a first heater wire 63 is wound around the surface of the collecting pipe 61, a heat dissipating plate 64 is mounted on the back surface of the collecting pipe 61, and a heat dissipating fan 65 is fixedly mounted on the top of the heat dissipating plate 64.

Referring to fig. 5, in order to facilitate the adsorption of organic substances, the adsorbent 62 includes a type a adsorbent 621, a type B adsorbent 622, and a type C adsorbent 623, the type a adsorbent 621, the type B adsorbent 622, and the type C adsorbent 623 are sequentially disposed in the collection pipe 61 from right to left, the adsorption capacities of the type a adsorbent 621, the type B adsorbent 622, and the type C adsorbent 623 are sequentially enhanced, and the type a adsorbent 621, the type B adsorbent 622, and the type C adsorbent 623 are poly 2, 6-diphenyl p-phenylene ether, silica gel, and carbon molecular sieve, respectively.

Referring to fig. 4, in order to facilitate the enrichment and desorption of organic matters, the trap pipe 61 is made of glass, the outer diameter of the trap pipe 61 is 6.5mm, the right and left ends of the trap pipe 61 are respectively a thin opening end and a thick opening end, and the inner diameters of the thin opening end and the thick opening end of the trap pipe 61 are respectively 1mm and 3.9 mm.

Referring to fig. 1, in order to fully take out organic matters in a water sample, a blowing pipe 2 is U-shaped, and a second heating wire 10 is wound on the surface of the blowing pipe 2.

Referring to fig. 2, in order to detect the temperature of the water sample, a quartz sieve plate 11 and a temperature sensor 12 are respectively disposed inside the purging tube 2, and a plurality of through holes are formed in the top of the quartz sieve plate 11.

The working principle is as follows: the working process of the device comprises two parts:

1. purging and adsorbing, namely loading an analyzed water sample into a purging pipe 2, blowing carrier gas into the purging pipe 2 through a first carrier gas pipe 1, enabling the gas to generate a plurality of tiny bubbles after passing through a quartz sieve plate 11 inside the purging pipe 2, taking out volatile organic compounds, enabling the volatile organic compounds in the water sample to be changed into gas state and exist in the carrier gas, entering a stainless steel pipeline 3 through the other end of the purging pipe 2, transmitting the gas to a nafion pipe 4, transmitting the gas to a collecting pipe 61 through the right end and the left end of a first electromagnetic three-way valve 5, enabling the volatile organic compounds in the gas containing the volatile organic compounds to be adsorbed by an adsorbent 62 in the collecting pipe 61, after the organic compounds enter the collecting pipe 61, firstly being adsorbed by an A-type adsorbent 621, if the adsorption strength of the A-type adsorbent 621 is not enough, being adsorbed by a B-type adsorbent 622 or a C-type adsorbent 623, adsorbing the volatile organic compounds in the adsorbent 62, the exhaust gas is blown out from the other end of the collecting pipe 61, passes through the right end and the bottom end of the second electromagnetic three-way valve 7 and is finally discharged from the exhaust port 8.

2. Heating and analyzing: after the stripping and adsorption are finished, the temperature of the first heating wire 63 on the collecting pipe 61 begins to rise rapidly, meanwhile, the first electromagnetic three-way valve 5 and the second electromagnetic three-way valve 7 are switched, at the moment, the carrier gas in the second carrier gas pipe 9 reversely blows the collecting pipe 61, if organic matters are adsorbed by the C-type adsorbent 623, the organic matters cannot be adsorbed by the B-type adsorbent 622 and the A-type adsorbent 621, the phenomenon that the organic matters are repeatedly adsorbed and analyzed is reduced, the carrier gas firstly passes through the top end and the right end of the second electromagnetic three-way valve 7, flows through the collecting pipe 61 to carry the organic matters, is transmitted to the left end of the first electromagnetic three-way valve 5 and then flows to the top end, and then the concentrated volatile organic matters are transmitted to a chromatograph for analysis through the stainless steel.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A purging and trapping device comprising a first carrier gas pipe (1), characterized in that: the bottom of the first gas carrying pipe (1) is communicated with a purging pipe (2), the other end of the purging pipe (2) is communicated with a stainless steel pipeline (3), the left end of the stainless steel pipeline (3) is communicated with a nafion pipe (4), the left end of the nafion pipe (4) is communicated with a first electromagnetic three-way valve (5) through a stainless steel pipeline (3), the left end of the first electromagnetic three-way valve (5) is communicated with a trapping mechanism (6) through a stainless steel pipeline (3), the left end of the trapping mechanism (6) is communicated with a second electromagnetic three-way valve (7) through a stainless steel pipeline (3), the bottom end of the second electromagnetic three-way valve (7) is communicated with an exhaust port (8) through a stainless steel pipeline (3), the top of the second electromagnetic three-way valve (7) is communicated with a second gas carrying pipe (9), the top of the first electromagnetic three-way valve (5) is communicated with the inlet of the gas chromatograph through a stainless steel pipeline (3).

2. A purge and trap apparatus as defined in claim 1 wherein: the trapping mechanism (6) comprises a trapping pipe (61), an adsorbent (62) is arranged inside the trapping pipe (61), a first heating wire (63) is wound on the surface of the trapping pipe (61), a heat dissipation plate (64) is mounted on the back surface of the trapping pipe (61), and a heat dissipation fan (65) is fixedly mounted on the top of the heat dissipation plate (64).

3. A purge and trap apparatus as claimed in claim 2, wherein: the adsorbent (62) comprises an A-type adsorbent (621), a B-type adsorbent (622) and a C-type adsorbent (623), the A-type adsorbent (621), the B-type adsorbent (622) and the C-type adsorbent (623) are sequentially arranged in a collecting pipe (61) from right to left, the adsorption capacities of the A-type adsorbent (621), the B-type adsorbent (622) and the C-type adsorbent (623) are sequentially enhanced, and the A-type adsorbent (621), the B-type adsorbent (622) and the C-type adsorbent (623) are poly (2, 6-diphenyl-p-phenylene ether), silica gel and a carbon molecular sieve respectively.

4. A purge and trap apparatus as claimed in claim 2, wherein: the collecting pipe (61) is made of glass, the outer diameter of the collecting pipe (61) is 6.5mm, the right end and the left end of the collecting pipe (61) are respectively a thin-opening end and a thick-opening end, and the inner diameters of the thin-opening end and the thick-opening end of the collecting pipe (61) are respectively 1mm and 3.9 mm.

5. A purge and trap apparatus as defined in claim 1 wherein: the blowing pipe (2) is U-shaped, and a second heating wire (10) is wound on the surface of the blowing pipe (2).

6. A purge and trap apparatus as defined in claim 1 wherein: the inside of sweeping pipe (2) is provided with quartz sieve board (11) and temperature sensor (12) respectively, a plurality of through-hole has been seted up at the top of quartz sieve board (11).