CN212060104U - Novel chromatographic sample injector - Google Patents
Novel chromatographic sample injector Download PDFInfo
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- CN212060104U CN212060104U CN202020221675.XU CN202020221675U CN212060104U CN 212060104 U CN212060104 U CN 212060104U CN 202020221675 U CN202020221675 U CN 202020221675U CN 212060104 U CN212060104 U CN 212060104U
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Abstract
The utility model discloses a novel chromatographic sample injector, wherein a driving gas inlet, a carrier gas inlet, a sample gas inlet and a sample injector outlet which is directly connected with a chromatographic column are arranged on a valve body main body, wherein the carrier gas inlet is communicated with the sample injector outlet; the driving gas inlet is provided with a channel communicated to the inside of the valve body main body, the bottom of the channel is coated with a layer of completely closed soft film, the sample gas inlet is communicated to the lower surface of the soft film, the soft film can be pressed downwards in the channel by the driving gas to close the channel of the sample gas inlet, after the pressure in the channel is relieved, the sample gas is introduced to push the soft film upwards by virtue of the self pressure, and the carrier gas brings the sample gas into the chromatographic column. The device ingeniously realizes the chromatographic sample introduction function by utilizing the pneumatic function, is simpler and more convenient, can realize accurate quantitative analysis on sample gas, and ensures the air tightness and stability of the test process.
Description
Technical Field
The utility model belongs to chromatogram detection and analysis field, concretely relates to novel chromatogram injector.
Background
The chromatograph is widely applied to industries related to detection and analysis as an analytical instrument. The chromatogram sampling system is used as an important part of chromatogram composition, and plays an important role in the fluency, stability and accuracy of sample detection. In the prior art, a chromatographic sampling system mainly adopts a combination of a sampling valve and a quantitative ring, and after the quantitative ring is filled with sample gas through switching of the sampling valve, the sample gas is transported to a subsequent detection system by carrier gas.
Although the combination of the sample injection valve, particularly the six-way sample injection valve, and the quantitative ring is very widely applied, the core of the device manufacturing technology is mastered in the hands of individual foreign enterprises, and when a chromatographic analysis instrument with a specific analysis function needs to be developed independently, the combination in the prior art is relatively complex, the device is not beneficial to miniaturization, and products with higher precision all need to be imported, so that the production cost is higher, and the large-scale mass production and popularization are not beneficial.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, an object of the present invention is to provide a novel chromatograph sample injector, which can replace the combination of sample injection valve and quantitative ring in the prior art, and the sample injection device is simpler on the premise of ensuring the stability and accuracy of analysis.
The utility model discloses a following technical scheme:
novel chromatogram injector, including the valve body main part, the valve body main part has:
the first connecting end is used as a driving gas inlet and is externally connected with a driving gas control valve and a pressure relief valve, a channel is formed in the first connecting end and is led into the valve body main body, and the bottom of the channel is coated with a layer of soft film;
the second connecting end is used as a carrier gas inlet and communicated to the lower surface of the soft film;
the third connecting end is used as a sample gas inlet, is externally connected with a sample control valve and an exhaust valve and is communicated to the lower surface of the soft film;
and the fourth connecting end is used as an outlet of the sampler and is connected with the chromatographic column, communicated to the lower surface of the soft membrane and communicated with the second connecting end.
According to the utility model discloses a specific embodiment of novel chromatogram injector, the third link lets in the center of mantle to effect when further guaranteeing airtight and top-down effect.
According to the utility model discloses a specific embodiment of novel chromatogram injector, the mantle lower surface sets up annular cavity, and the distance that is located between the internal connecting hole that sets up two mutual symmetries of annular cavity and the connecting hole is the average value of the sum of the outer lane diameter in the annular cavity, one of them connecting hole with second link intercommunication, another connecting hole with fourth link intercommunication. The carrier gas enters from the second connecting end, is uniformly distributed from the annular cavity and then is converged to the fourth connecting end, so that the flowing stability of the carrier gas and the uniformity of the gas are ensured.
According to the utility model discloses a concrete embodiment of novel chromatogram injector, the sample inlet pipeline area pressure sensor of the external sample gas of third link, sample gas lets in after pressure sensor accuse pressure. The pressure sensor can be monitored to ensure the pressure of the sample gas entering, thereby ensuring the sample volume in a certain time. Furthermore, the chromatographic sample injector also comprises a control system, wherein the driving air control valve, the pressure relief valve, the sample air control valve and the emptying valve are connected with the control system together and controlled by a control system program; when the sample is not introduced, the control valve of the driving gas is opened, the channel of the first connecting end has certain pressure, the sample gas is in a continuous emptying state at the moment, and the soft membrane is pushed downwards to block the sample gas from the carrier gas. When sample introduction is needed, the pressure relief valve is controlled to open a channel of the first connecting end for pressure relief, the emptying valve of the sample gas is closed to enable the sample gas to be introduced and to continue under a certain pressure, the sample gas pushes the flexible membrane upwards to open and then contacts with carrier gas to realize sample introduction, and after the sample gas is introduced for a certain time, the emptying valve of the sample gas is opened, the control valve of the driving gas is opened, and the sample gas injection port is closed again. The control system is matched with the pressure sensor to ensure the sampling pressure and time, and the accuracy of the sampling quantity can be further ensured.
According to a specific embodiment of the novel chromatogram injector of the utility model, the mantle is organosilicon PDMS film or silica gel film. The soft membrane has hydrophobicity and waterproofness, is inert, does not react with sample gas, has high elasticity and can be recovered, so the soft membrane is particularly suitable for micro-control and has strong stability.
Since the technical scheme is used, the utility model discloses following beneficial effect has:
1. the functions of the sample injection valve and the quantitative ring are integrated into the same valve body, and the sample injection of the chromatogram is skillfully realized by utilizing the pneumatic function, so that the device is simpler and more convenient compared with the device in the prior art;
2. the flow path design of each gas in the valve body is optimized, so that the running stability of the device and the sampling accuracy are improved;
3. and a control system is added, so that all valve body equipment and the gas switch can be controlled by the control system in a correlation manner, the automation of the operation of the device is realized, and the accuracy is improved.
Drawings
In order to more clearly illustrate the technical solution of the mode of the invention, the drawings that are required to be used in the embodiment are briefly described below, it should be understood that the following drawings only illustrate some embodiments of the invention, and are not to be considered as limiting the scope, and that for a person skilled in the art, other relevant drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic diagram of the chromatographic sample injector of the present invention.
In the figure, 1 is a valve body, 2 is a first connecting end, 3 is a second connecting end, 4 is a third connecting end, 5 is a fourth connecting end, 6 is a soft membrane, and 7 is an annular cavity.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are 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. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.
In the description of the present invention, it is to be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present disclosure, unless otherwise expressly stated or limited, the first feature may comprise both the first and second features directly contacting each other, and also may comprise the first and second features not being directly contacting each other but being in contact with each other by means of further features between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.
Examples
As shown in fig. 1, a chromatography sample injector comprises a valve body 1, which is selected from stainless steel valve bodies, wherein the valve body 1 comprises:
the first connecting end 2 is internally provided with connecting threads and is used as a driving gas inlet, high-pressure nitrogen can be selected to be connected, a control valve and a pressure relief valve are arranged on a sample inlet pipeline of the driving gas, and the high-pressure driving gas is controlled to enter by the control valve; the first connecting end 2 is introduced into the valve body main body 1 through the opening of the channel, the bottom of the channel is coated with a layer of completely closed soft membrane 6, the soft membrane 6 separates the inner space and the outer space of the channel to prevent the carrier gas or the sample gas from carrying out gas exchange with the driving gas, the soft membrane 6 can be an organic silicon PDMS thin film or a silica gel thin film, the soft membrane 6 has hydrophobicity and waterproofness, is inert, can not react with the sample gas, has high elasticity and can be restored, and therefore the valve is particularly suitable for micro-control and has strong stability.
A connecting thread is arranged in the port of the second connecting end 3, an external carrier gas steel cylinder is used as a carrier gas inlet, and a channel is processed in the valve body main body 1 and communicated to the lower surface of the soft membrane 6; and a fourth connecting end 5, a connecting thread is arranged in the port of the fourth connecting end, the fourth connecting end is used as an interface communicated with the chromatogram, a channel is processed in the valve body main body 1 and communicated to the lower surface of the soft membrane 6, and the fourth connecting end is communicated with the second connecting end 3. The carrier gas is introduced from the second connecting end 3, is discharged from the fourth connecting end 5 after passing through the interior of the valve body main body 1, and enters the chromatogram. As a specific scheme of this embodiment, an annular cavity 7 is dug on the valve body main body 1 on the lower surface of the soft membrane 6, two symmetrical connecting holes are arranged in the annular cavity 7, and the distance between the connecting holes is the average value of the sum of the diameters of the inner ring and the outer ring of the annular cavity 7, wherein one connecting hole is communicated with the second connecting end 3, and the other connecting hole is communicated with the fourth connecting end 5. The carrier gas enters from the second connecting end 3, is uniformly distributed from the annular cavity 7 and then is converged to the fourth connecting end 5, so that the flowing stability of the carrier gas and the uniformity of the gas are ensured.
The third connecting end 4, the port embeds connecting thread, and the external sample gas of taking control valve and exhaust-valve leads to the entry as sample gas, and the processing passageway communicates to 6 lower surfaces of mantle in valve body main part 1, guarantees that mantle 6 can seal the air inlet that third connecting end 4 stretched into. Preferably, the third connection end 4 opens into the center of the bottom of the flexible membrane 6. When the sample is not introduced, the channel of the first connecting end 2 is filled with driving gas with higher pressure, such as 0.5MPa, the pressure pushing soft film 6 is propped against the channel of the third connecting end 4, at the moment, the sample gas inlet is not communicated with carrier gas, the sample gas control valve is normally open, and the sample gas exhaust valve is controlled to be in an exhaust state; when a sample is fed, the evacuation valve of the sample gas is closed, the high-pressure driving gas in the channel is released, the sample gas enters the channel and can be pushed upwards to open the flexible membrane 6 under a certain pressure (for example, 0.3MPa), and then the sample gas contacts with the carrier gas, and the carrier gas carries the sample gas to enter chromatographic analysis. By controlling the pressure of the sample gas entering and the maintaining time of the pressure of the sample gas, the entering amount of the sample gas can be controlled. Preferably, a pressure sensor is connected to the sample gas control valve to ensure the pressure of the sample gas entering.
In a preferable scheme of the embodiment, the device further comprises a control system, the control system can be selected as a PLC (programmable logic controller), and the control valve for driving the control valve, the pressure relief valve and the sample gas and the exhaust valve can be controlled by the control system in a linkage manner. When the sample is not introduced, the control valve of the driving gas is opened, so that a certain pressure is kept in the channel of the first connecting end, the sample gas is in a continuous emptying state at the moment, and the soft membrane is pushed downwards to block the sample gas from the carrier gas. When sample introduction is needed, the control system controls the pressure relief valve to open and relieve pressure of the channel, the emptying valve of the sample gas is closed to enable the sample gas to be introduced and continue under certain pressure, the sample gas jacks the flexible membrane to be in contact with carrier gas to realize sample introduction, and after the sample gas is introduced for certain time, the emptying valve of the sample gas is opened, the control valve of the driving gas is opened, and the sample gas injection port is closed again. The control system is matched with the pressure sensor to ensure the sampling pressure and time, and the accuracy of the sampling quantity can be further ensured.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. Novel chromatogram injector, its characterized in that, including the valve body main part, the valve body main part has:
the first connecting end is used as a driving gas inlet and is externally connected with a driving gas control valve and a pressure relief valve, a channel is formed in the first connecting end and is led into the valve body main body, and the bottom of the channel is coated with a layer of soft film;
the second connecting end is used as a carrier gas inlet and communicated to the lower surface of the soft film;
the third connecting end is used as a sample gas inlet, is externally connected with a sample control valve and an exhaust valve and is communicated to the lower surface of the soft film;
and the fourth connecting end is used as a sampler outlet and is connected with the chromatographic column, communicated to the lower surface of the soft membrane and communicated with the second connecting end.
2. The novel chromatographic sample injector according to claim 1, characterized in that the third connection end is connected to the center of the soft membrane.
3. The novel chromatographic sample injector according to claim 1, characterized in that the lower surface of the soft membrane is provided with an annular cavity, two connecting holes which are symmetrical to each other are arranged in the annular cavity, the distance between the connecting holes is the average value of the sum of the diameters of the inner ring and the outer ring of the annular cavity, one connecting hole is communicated with the second connecting end, and the other connecting hole is communicated with the fourth connecting end.
4. The novel chromatography sample injector of claim 1, in which the third connection port is externally connected to a sample gas inlet line with a pressure sensor.
5. The novel chromatography sample injector of claim 4, further comprising a control system, wherein the drive gas control valve and the pressure relief valve are connected with the sample gas control valve and the evacuation valve and the control system, and are controlled by the control system program.
6. The novel chromatography sample injector of any of claims 1-5, characterized in that the soft membrane is a silicone PDMS membrane or a silica gel membrane.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020221675.XU CN212060104U (en) | 2020-02-27 | 2020-02-27 | Novel chromatographic sample injector |
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| CN202020221675.XU CN212060104U (en) | 2020-02-27 | 2020-02-27 | Novel chromatographic sample injector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112834667A (en) * | 2020-12-31 | 2021-05-25 | 贵州电网有限责任公司 | Transformer oil chromatogram sampling device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112834667A (en) * | 2020-12-31 | 2021-05-25 | 贵州电网有限责任公司 | Transformer oil chromatogram sampling device |
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