CN210269738U - Trace volatile organic compound enrichment and sampling device - Google Patents
Trace volatile organic compound enrichment and sampling device Download PDFInfo
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- CN210269738U CN210269738U CN201920157016.1U CN201920157016U CN210269738U CN 210269738 U CN210269738 U CN 210269738U CN 201920157016 U CN201920157016 U CN 201920157016U CN 210269738 U CN210269738 U CN 210269738U
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- sampling needle
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- volatile organic
- organic compound
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Abstract
The utility model discloses a trace volatile organic compound enrichment and sampling device, injector solid phase extraction device promptly. The sampler comprises an outer sleeve and a push-pull rod, wherein a piston is arranged at one end of the push-pull rod, and one end of the push-pull rod, which is provided with the piston, is sleeved in an inner cavity of the outer sleeve; the sample injector is connected with the sampling needle through a three-way valve, and the heating device is sleeved on the outer wall of the sampling needle. A trace volatile organic compound enrichment and sampling device, its is rational in infrastructure, have simple structure, convenient to use, low cost, practical reliable, enrichment is effectual, advantages such as sensitivity height, effectively solved the not good problem of SPME sampling equipment result of use.
Description
Technical Field
The utility model belongs to the technical field of chemical analysis equipment and specifically relates to a trace volatile organic compound enrichment and sampling device, injector solid phase extraction device promptly is related to.
Background
In the recent research, a Solid phase micro-extraction (SPME) technology is introduced into the field of oil and gas geology, and analysis of some light hydrocarbon compounds in oil and gas geological samples is realized by performing systematic optimization on experimental conditions. However, in the research, it is also found that when the SPME method is used for processing oil and gas geological samples, the collected target compounds depend on the type, thickness and length of the fiber head to a great extent, and in the process of carrying out isotope analysis by using the technology, the amount of the collected low-content compounds cannot reach the minimum limit of the detection of an instrument, so that the low-content compounds cannot be detected; sample processing times and temperatures tend to produce discrimination effects for different types of compounds, for gaseous hydrocarbon compounds such as: the enrichment effect is not obvious when the carbon number n is less than 4. Meanwhile, the disadvantages of limited types of stationary phase coatings, easy abrasion of the extraction head, limited service life, high price and the like exist.
Disclosure of Invention
The to-be-solved technical problem of the utility model is: in order to overcome the problems in the prior art, the enrichment and sample introduction device for the trace volatile organic compounds is provided, has the advantages of reasonable structure, simple structure, convenience in use, low cost, practicability, reliability, good enrichment effect, high sensitivity and the like, and effectively solves the problem of poor use effect of SPME sampling equipment.
The utility model provides a technical scheme that its technical problem adopted is: a trace volatile organic compound enrichment and sample injection device comprises a sample injector, a three-way valve, a sampling needle and a heating device, wherein the sample injector comprises an outer sleeve with a hollow structure and a push-pull rod, one end of the push-pull rod is provided with a piston, and one end of the push-pull rod, which is provided with the piston, is sleeved in an inner cavity of the outer sleeve;
the three-way valve is provided with a first interface, a second interface, a third interface and a rotary valve, and any two of the first interface, the second interface and the third interface are communicated under the action of the rotary valve;
the sampling needle comprises a sampling needle body with a hollow structure and a miniature metal cavity; the miniature metal cavity is an expansion section which is connected and arranged on the sampling needle body, the inner diameter of the miniature metal cavity is larger than that of the inner cavity of the sampling needle body, the miniature metal cavity is communicated with the inner cavity of the sampling needle body, and the miniature metal cavity is filled with a solid adsorbent;
the third interface is fixedly connected with the outer sleeve through a first connector, and inner cavities of the third interface and the outer sleeve are communicated; the first interface is fixedly connected with a third connector through a second connector, the third connector is fixedly connected with the sampling needle body, and inner cavities of the sampling needle body, the first interface, the second connector and the third connector are communicated with each other;
the heating device is sleeved on the outer wall of the miniature metal cavity.
Furthermore, the sampling needle is made of metal, and the micro metal cavity and the sampling needle body are of an integrated structure.
Further, the voltage across the heating device is 24V.
Furthermore, the heating device is a sleeve-shaped structure wound by a micro heating pipe.
The utility model has the advantages that: a trace volatile organic compound enrichment and sample introduction device can be filled with different types of adsorbents in a micro metal cavity according to the chemical characteristics of an analyzed target compound, and has strong applicability and practicability; the micro metal cavity can be cooled or heated, so that the enrichment or the resolution of a target compound is facilitated; the sampling needle body at the front end of the metal cavity can be inserted into a gas chromatography sample inlet for sample injection; the utility model can not only realize the enrichment of trace compounds in gas samples, but also realize the effective enrichment and sample introduction of trace volatile compounds in liquid samples and headspace samples; compared with solid phase microextraction, the device has large sample extraction amount, can randomly set the analytic temperature, can realize repeated sample introduction of samples, and is a sample pretreatment device integrating sampling, extraction, concentration and sample introduction; the SPME sampling device is reasonable in structure, has the advantages of being simple in structure, convenient to use, low in cost, practical, reliable, good in enrichment effect, high in sensitivity and the like, and effectively solves the problem that the use effect of the SPME sampling device is not good.
Drawings
The present invention will be further explained with reference to the drawings and examples.
FIG. 1 is a schematic view of the overall structure of a trace quantity of VOC enrichment and sampling device according to the present invention;
FIG. 2 is a schematic structural diagram of a three-way valve of the trace quantity VOC concentration and sampling device according to the present invention;
fig. 3 is a schematic structural diagram of a sampling needle and a heating device of the trace quantity volatile organic compound enrichment and sampling device of the present invention.
The scores in the figures are as follows: 1. the sampler comprises a sample injector 11, a push-pull rod 12, an outer sleeve 2, a three-way valve 21, a first connector 22, a second connector 23, a third connector 24, a rotary valve 25, a first connector 26, a second connector 27, a third connector 3, a sampling needle 31, a sampling needle body 32, a micro metal cavity 4 and a heating device.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.
The trace quantity volatile organic compound enrichment and sample injection device shown in fig. 1 to fig. 3 comprises a sample injector 1, a three-way valve 2, a sampling needle 3 and a heating device 4, wherein the sample injector 1 comprises an outer sleeve 12 with a hollow structure and a push-pull rod 11, a piston is arranged at one end of the push-pull rod 11, and one end of the push-pull rod 11 with the piston is sleeved in an inner cavity of the outer sleeve 12.
The three-way valve 2 is provided with a first connector 21, a second connector 22, a third connector 23 and a rotary valve 24, and any two of the first connector 21, the second connector 22 and the third connector 23 are communicated under the action of the rotary valve.
The sampling needle 3 comprises a sampling needle body 31 with a hollow structure and a micro metal cavity 32; the miniature metal cavity 32 is an expansion section which is connected and arranged on the sampling needle body 31, the inner diameter of the miniature metal cavity 32 is larger than the inner diameter of the inner cavity of the sampling needle body 31, the miniature metal cavity 32 is communicated with the inner cavity of the sampling needle body 31, and the miniature metal cavity 32 is filled with a solid adsorbent.
The third port 23 is fixedly connected with the outer sleeve 12 through a first connector 25, and the inner cavities of the third port and the outer sleeve are communicated; the first interface 21 is fixedly connected with the third connector 27 through the second connector 26, the third connector 27 is fixedly connected with the sampling needle body 31, and the inner cavities of the sampling needle body 31, the first interface 21, the second connector 26 and the third connector 27 are communicated with each other.
The heating device 4 is sleeved on the outer wall of the miniature metal cavity 32.
In one embodiment, the sampling needle 3 is made of metal, and the micro metal cavity 32 and the sampling needle body 31 are a single structure.
In one embodiment, the end of the sampling needle 3 not connected to the third connector 27 is provided with a sealing mechanism, such as a plug or a cover, for preventing the sample from leaking.
In one embodiment, the voltage across the heating device 4 is 24V.
In one embodiment, the heating device 4 is a sleeve-like structure wound by a micro-heating tube.
The utility model discloses during the use, select suitable temperature, adsorbent in the metal cavity is activated under the high-purity carrier gas flow condition, treat the analysis sample with the sampling needle disect insertion, the sample type can be gas sample, liquid sample or headspace sample, push-and-pull injector push-and-pull rod, make gas or liquid sample pass through the adsorbent in miniature metal cavity repeatedly, trace volatility target compound can realize adsorbing or the enrichment, heat miniature metal cavity, by the thermal analysis of adsorbed compound, through push-and-pull injector push-and-pull rod, the target compound of enrichment can get into the injector needle tubing, under high temperature, because the adsorbent can not realize the secondary absorption to target compound, the sample accessible sampling needle after the analysis realizes gas chromatography and advances the appearance, also can utilize the three-way valve to realize advancing a lot of the appearance.
The utility model discloses a trace volatile organic compound enrichment and sampling device, its rational in infrastructure, can fill different types of adsorbents in miniature metal cavity according to the chemical characteristic of target compound analyzed, suitability and practicality are strong; the micro metal cavity can be cooled or heated, so that the enrichment or the resolution of a target compound is facilitated; the sampling needle body at the front end of the metal cavity can be inserted into a gas chromatography sample inlet for sample injection; the utility model can not only realize the enrichment of trace compounds in gas samples, but also realize the effective enrichment and sample introduction of trace volatile compounds in liquid samples and headspace samples; compared with solid phase microextraction, the device has large sample extraction amount, can randomly set the analytic temperature, can realize repeated sample introduction of samples, and is a sample pretreatment device integrating sampling, extraction, concentration and sample introduction; the SPME sampling device is reasonable in structure, has the advantages of being simple in structure, convenient to use, low in cost, practical, reliable, good in enrichment effect, high in sensitivity and the like, and effectively solves the problem that the use effect of the SPME sampling device is not good.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (4)
1. A trace volatile organic compound enrichment and sample introduction device is characterized in that: the sampler comprises a sampler (1), a three-way valve (2), a sampling needle (3) and a heating device (4), wherein the sampler (1) comprises an outer sleeve (12) with a hollow structure and a push-pull rod (11), one end of the push-pull rod (11) is provided with a piston, and the end, provided with the piston, of the push-pull rod (11) is sleeved in an inner cavity of the outer sleeve (12);
the three-way valve (2) is provided with a first interface (21), a second interface (22), a third interface (23) and a rotary valve (24), and any two of the first interface (21), the second interface (22) and the third interface (23) are communicated under the action of the rotary valve;
the sampling needle (3) comprises a sampling needle body (31) with a hollow structure and a micro metal cavity (32); the miniature metal cavity (32) is an expansion section which is connected and arranged on the sampling needle body (31), the inner diameter of the miniature metal cavity (32) is larger than that of the inner cavity of the sampling needle body (31), the miniature metal cavity (32) is communicated with the inner cavity of the sampling needle body (31), and the miniature metal cavity (32) is filled with a solid adsorbent;
the third interface (23) is fixedly connected with the outer sleeve (12) through a first connector (25), and inner cavities of the third interface and the outer sleeve are communicated; the first interface (21) is fixedly connected with the third connector (27) through the second connector (26), the third connector (27) is fixedly connected with the sampling needle body (31), and inner cavities of the sampling needle body (31), the first interface (21), the second connector (26) and the third connector (27) are communicated with each other;
the heating device (4) is sleeved on the outer wall of the miniature metal cavity (32).
2. The trace volatile organic compound enrichment and sample injection device according to claim 1, wherein: the sampling needle (3) is made of metal, and the micro metal cavity (32) and the sampling needle body (31) are of an integrated structure.
3. The trace volatile organic compound enrichment and sample injection device according to claim 1, wherein: the voltage at the two ends of the heating device (4) is 24V.
4. The trace volatile organic compound enrichment and sample injection device according to claim 1, wherein: the heating device (4) is a sleeve-shaped structure wound by a micro heating pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920157016.1U CN210269738U (en) | 2019-01-30 | 2019-01-30 | Trace volatile organic compound enrichment and sampling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920157016.1U CN210269738U (en) | 2019-01-30 | 2019-01-30 | Trace volatile organic compound enrichment and sampling device |
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| Publication Number | Publication Date |
|---|---|
| CN210269738U true CN210269738U (en) | 2020-04-07 |
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| CN201920157016.1U Expired - Fee Related CN210269738U (en) | 2019-01-30 | 2019-01-30 | Trace volatile organic compound enrichment and sampling device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109813819A (en) * | 2019-01-30 | 2019-05-28 | 中国科学院地质与地球物理研究所兰州油气资源研究中心 | A kind of micro volatile organic compounds enrichment and sampling device |
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2019
- 2019-01-30 CN CN201920157016.1U patent/CN210269738U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109813819A (en) * | 2019-01-30 | 2019-05-28 | 中国科学院地质与地球物理研究所兰州油气资源研究中心 | A kind of micro volatile organic compounds enrichment and sampling device |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200407 Termination date: 20210130 |