CN209856440U - Three-way switching valve applied to gas chromatography mass spectrometer for connecting thermal desorption - Google Patents
Three-way switching valve applied to gas chromatography mass spectrometer for connecting thermal desorption Download PDFInfo
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- CN209856440U CN209856440U CN201822084940.XU CN201822084940U CN209856440U CN 209856440 U CN209856440 U CN 209856440U CN 201822084940 U CN201822084940 U CN 201822084940U CN 209856440 U CN209856440 U CN 209856440U
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- thermal desorption
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Abstract
The utility model relates to a gas chromatography-mass spectrometer's technical field, more specifically relates to a be applied to gas chromatography mass spectrometer and connect three-way switch valve of thermal desorption. A three-way switching valve applied to a gas chromatography mass spectrometer for connecting thermal desorption; the automatic sampler comprises a valve shell, a rotating mechanism and a valve body, wherein the valve shell is provided with an automatic sampler interface, a thermal analysis interface and a mass spectrum detector interface on the outer wall respectively, the inner wall of the valve shell is provided with a track groove for the rotating mechanism to rotate, and the track groove and the rotating mechanism are provided with a positioning mechanism for positioning the rotating mechanism. The utility model discloses be equivalent to be to the special accessories between mass spectrum, thermal desorption and the auto-injector three, design to the three instrument characteristics, including the shape of interface, the material, coefficient of expansion and temperature resistant degree, stability can be stable with anti-interference performance, has automatic identification and accurate locate function, sparingly experiment operation.
Description
Technical Field
The utility model relates to a gas chromatography-mass spectrometer's technical field, more specifically relates to a be applied to gas chromatography mass spectrometer and connect three-way switch valve of thermal desorption.
Background
The gas chromatograph-mass spectrometer is a mass spectrometer used in medicine and physics, and the mass spectrometry is an analysis method for measuring the charge-mass ratio of ions, and its basic principle is that all the components in the sample are ionized in the ion source to produce ions with different charge-mass ratios and positive charges, and the ions are formed into ion beams under the action of accelerating electric field and fed into the mass analyzer. In the mass analyzer, the mass is determined by dispersing the generated opposite velocities by an electric field and a magnetic field, and focusing them to obtain mass spectra.
Thermal desorption is a process of heating the contaminated medium and the organic contaminants contained therein to a sufficient temperature (usually 150-540 ℃) by direct or indirect heat exchange, so as to volatilize or separate the organic contaminants from the contaminated medium. Thermal desorption techniques generally fall into two broad categories: the technology for heating the soil or the sediments at the temperature of 150-315 ℃ is a low-temperature thermal desorption technology; the temperature reaches 315-540 ℃ by adopting a high-temperature thermal desorption technology.
The thermal analysis technology is a two-in-one technology which integrates sampling and concentration into a whole, and then a sample is transferred from a sampling tube and detected. The thermal analyzer captures organic compounds using a glass tube filled with an adsorbent, then introduces them into a gas chromatograph, and separates and measures these organic compounds by gas chromatography. And (3) performing two-stage analysis by using an adsorption tube in the analysis process: firstly, adopting large-volume sampling to retain a compound in an adsorption tube (sampling tube) with high capacity, and then heating and resolving the compound into a next-stage capillary focusing tube (first-stage resolving); and secondly, heating and analyzing the sample enriched in the capillary focusing tube again, and then introducing the sample into the gas chromatography capillary tube (secondary analysis).
The chamber is mainly used for processing a gas sample by using a thermal analyzer to analyze the gas sample. Collecting a gas sample by using an adsorption tube filled with an adsorbent, enriching organic pollutants in the gas sample in the adsorption tube, analyzing the organic pollutants enriched in the adsorption tube by using a thermal analyzer, separating the organic pollutants by entering a gas chromatograph through secondary analysis, and determining by using a mass spectrometer.
In the actual organic analysis process, the automatic sample injector and the thermal analysis instrument need to be switched back and forth, the standard operation of switching is that firstly the gas chromatography mass spectrometer is shut down, the thermal analysis instrument is connected, and vacuumizing is carried out, common instrument manufacturers recommend 2h qualitative analysis and 4h quantitative analysis under an ideal state, and in the actual experimental operation process, an ion source is added for cleaning and installation, and vacuumizing is carried out. . . . . . And only two kinds of instruments need to be switched for more than 12 hours, and then the instrument leakage detection and the gas quality tuning are carried out at the later stage. . . . . . Therefore, the next day is wasted, the experiment progress is delayed, and the operation is complicated. If the instrument is not closed, the thermal analysis instrument is directly switched, and the switching time is long, so that the phenomenon of air leakage can occur, the ion source is closed, the chromatographic column, the ion source and the gas chromatography mass spectrometer are greatly influenced, and the instrument is damaged.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an overcome above-mentioned prior art at least one defect, provide a three-way switch valve who is applied to gas chromatography mass spectrograph and connects thermal desorption, use this three-way valve can realize the different switching of advancing between the kind mode, convenient operation improves experimental efficiency.
The technical scheme of the utility model is that: a three-way switching valve applied to gas chromatography-mass spectrometer connection thermal desorption comprises a valve shell and a rotating mechanism which is arranged in the valve shell and can rotate around the axis of the valve;
the automatic sampler comprises a valve shell, a rotating mechanism and a valve body, wherein the valve shell is provided with an automatic sampler interface, a thermal analysis interface and a mass spectrum detector interface on the outer wall respectively, the inner wall of the valve shell is provided with a track groove for the rotating mechanism to rotate, and the track groove and the rotating mechanism are provided with a positioning mechanism for positioning the rotating mechanism.
The utility model discloses in, slewing mechanism can rotate around the axle center of valve, and when reacing corresponding interface, accessible positioning mechanism fixes a position, makes corresponding passageway and interface connection get up.
The utility model discloses an aim at one end long-term connection mass spectrum, thermal analysis and autoinjector are connected respectively at both ends in addition, realize the autoinjector advance kind and thermal analysis advance kind in the twinkling of an eye the switching, have automatic identification and accurate locate function simultaneously, both saved two kinds of the circumstances of advancing kind mode switch and need let out the vacuum condition of general condition, save time has avoided not letting out the harm influence that the vacuum caused to the mass spectrum under unconventional operating conditions simultaneously.
Furthermore, the rotating mechanism is in a three-split fork structure and comprises three end parts, namely a first end part, a second end part and a third end part, and the three end parts all extend into a space formed by the track grooves. The central angles among the first end part, the second end part and the third end part are all 120 degrees. The valve shell is circular, and central angles among the automatic sample injector interface, the thermal analysis interface and the mass spectrum detector interface are all 120 degrees.
Above-mentioned structure and angle set up and improved greatly the utility model discloses a commonality can realize the connection of passageway and interface, and is very convenient through slewing mechanism's rotation.
Furthermore, the positioning mechanism comprises a position identification device arranged on the first end part, the second end part and the third end part, and a position identification groove arranged in the track groove, wherein the position identification device is clamped with the position identification groove in a matching manner. The position recognition device is a protruding structure arranged on the end faces of the first end portion, the second end portion and the third end portion, and the protruding structure is matched and clamped with the position recognition groove.
The utility model discloses in, protruding structure inside still is equipped with the spring, and the joint is carried out to the elasticity of accessible spring. The positioning mode is simple and reliable.
Further, the automatic sample injector interface be equipped with column nut and graphite clamping ring. The utility model discloses in, can switch at will between the different instruments, the material is the resistant high temperature more than 300 degrees centigrade of metal stainless steel.
Compared with the prior art, the beneficial effects are: the utility model discloses be equivalent to special accessories between to mass spectrum, thermal desorption and the auto-injector three, design to the three instrument characteristics, including the shape of interface, the material, coefficient of expansion and temperature resistant degree, stability can be stable with anti-interference performance, has automatic identification and accurate locate function, sparingly tests the operation, improves experimental efficiency. The three-way switching valve is convenient to operate; the direct switching is realized, the air leakage is not easy to occur, and the experimental time is shortened; and has the functions of automatic identification and accurate positioning.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic end view of the rotating mechanism of the present invention.
Fig. 3 is an enlarged schematic view of the end of the rotating mechanism of the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
Example 1
As shown in fig. 1, a three-way switching valve for connecting thermal desorption of a gas chromatograph mass spectrometer comprises a valve housing 5, a rotating mechanism 6 which is arranged inside the valve housing 5 and can rotate around the axis of the valve;
an automatic sample injector interface A, a thermal analysis interface B and a mass spectrum detector interface C are respectively arranged on the outer wall of the valve shell 5, a track groove 3 for rotating the rotating mechanism 6 is arranged on the inner wall of the valve shell 5, and a positioning mechanism for positioning the rotating mechanism 6 is arranged on the track groove 3 and the rotating mechanism 6.
In this embodiment, the rotating mechanism 6 can rotate around the axis of the valve, and when reaching the corresponding port, the rotating mechanism can be positioned by the positioning mechanism, so that the corresponding channel and the port are connected.
The utility model discloses an aim at one end long-term connection mass spectrum, thermal analysis and autoinjector are connected respectively at both ends in addition, realize the autoinjector advance kind and thermal analysis advance kind in the twinkling of an eye the switching, have automatic identification and accurate locate function simultaneously, both saved two kinds of the circumstances of advancing kind mode switch and need let out the vacuum condition of general condition, save time has avoided not letting out the harm influence that the vacuum caused to the mass spectrum under unconventional operating conditions simultaneously.
In this embodiment, the rotating mechanism 6 has three fork-shaped structures, and includes three end portions, namely a first end portion a, a second end portion b, and a third end portion c, which all extend into the space formed by the track groove 3. The central angles of the first end part a, the second end part b and the third end part c are all 120 degrees. The valve housing 5 is circular, and the central angles among the automatic sample injector interface A, the thermal analysis interface B and the mass spectrum detector interface C are all 120 degrees.
Suppose that end A passes through the chromatographic column and connects the autosampler, end B passes through the chromatographic column and connects the thermal analysis appearance, and end C passes through the chromatographic column and connects the mass spectrometer, then when first end a, second end B intercommunication autosampler interface A and mass spectrometry detector interface C, mass spectrometer and autosampler intercommunication can directly advance a kind analysis through the autosampler. When the first end portion a and the second end portion B are communicated with the thermal analysis interface B and the mass spectrum detector interface C, the thermal analyzer is communicated with the mass spectrometer, and sample injection analysis can be carried out through the thermal analyzer. The three-way valve can realize the switching between different sampling modes, is convenient to operate and improves the experimental efficiency.
Wherein, be the gas circuit passageway between first end a, the second end b, its range is less, does not have the dead volume.
As shown in fig. 1, 2 and 3, the positioning mechanism includes a position recognition device 7 disposed at the first end a, the second end b and the third end c, and a position recognition groove 4 disposed in the track groove 3, wherein the position recognition device 7 is engaged with the position recognition groove 4. The position recognition device 7 is a protruding structure arranged on the end faces of the first end part a, the second end part b and the third end part c, and the protruding structure is matched and clamped with the position recognition groove 4. The inside spring that still is equipped with of protruding structure, the elasticity of accessible spring carries out the joint. The positioning mode is simple and reliable.
In addition, the automatic sample injector interface is provided with a column nut 1 and a graphite pressure ring 2.
Example 2
In this embodiment, the positioning mechanism may be a groove and a protrusion with interchangeable positions, or the positioning mechanism may be in other fixable forms, and the rest of the structure and the operation principle of this embodiment are the same as those of embodiment 1, and will not be described herein.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (7)
1. The three-way switching valve for connecting thermal desorption of the gas chromatography-mass spectrometer is characterized by comprising a valve shell (5) and a rotating mechanism (6) which is arranged in the valve shell (5) and can rotate around the axis of the valve;
the device is characterized in that an automatic sample injector interface (A), a thermal analysis interface (B) and a mass spectrum detector interface (C) are respectively arranged on the outer wall of the valve shell (5), a track groove (3) for rotating the rotating mechanism (6) is formed in the inner wall of the valve shell (5), and a positioning mechanism for positioning the rotating mechanism (6) is arranged on the track groove (3) and the rotating mechanism (6).
2. The three-way switching valve applied to gas chromatography-mass spectrometer connection thermal desorption as claimed in claim 1, wherein: the rotating mechanism (6) is in a three-split fork-shaped structure and comprises three end parts, namely a first end part (a), a second end part (b) and a third end part (c), and the three end parts all extend into a space formed by the track grooves (3).
3. The three-way switching valve applied to gas chromatography-mass spectrometer connection thermal desorption as claimed in claim 2, characterized in that: the central angles among the first end part (a), the second end part (b) and the third end part (c) are all 120 degrees.
4. The three-way switching valve applied to gas chromatography-mass spectrometer connection thermal desorption as claimed in claim 3, wherein: the valve shell (5) is circular, and central angles among the automatic sample injector interface (A), the thermal analysis interface (B) and the mass spectrum detector interface (C) are all 120 degrees.
5. The three-way switching valve applied to gas chromatography-mass spectrometer connection thermal desorption as claimed in claim 1, wherein: the positioning mechanism comprises a position recognition device (7) arranged on a first end part (a), a second end part (b) and a third end part (c), a position recognition groove (4) arranged in the track groove (3), and the position recognition device (7) is matched and clamped with the position recognition groove (4).
6. The three-way switching valve applied to gas chromatography-mass spectrometer connection thermal desorption as claimed in claim 5, wherein: the position recognition device (7) is a protruding structure arranged on the end faces of the first end portion (a), the second end portion (b) and the third end portion (c), and the protruding structure is matched and clamped with the position recognition groove (4).
7. The three-way switching valve applied to the connection thermal desorption of the gas chromatography mass spectrometer according to any one of claims 1 to 6, is characterized in that: the automatic sample injector interface (A) is provided with a column nut (1) and a graphite pressure ring (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822084940.XU CN209856440U (en) | 2018-12-12 | 2018-12-12 | Three-way switching valve applied to gas chromatography mass spectrometer for connecting thermal desorption |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822084940.XU CN209856440U (en) | 2018-12-12 | 2018-12-12 | Three-way switching valve applied to gas chromatography mass spectrometer for connecting thermal desorption |
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| CN209856440U true CN209856440U (en) | 2019-12-27 |
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| CN201822084940.XU Active CN209856440U (en) | 2018-12-12 | 2018-12-12 | Three-way switching valve applied to gas chromatography mass spectrometer for connecting thermal desorption |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11237083B1 (en) | 2020-07-16 | 2022-02-01 | The Government of the United States of America, as represented by the Secretary of Homeland Security | High volume sampling trap thermal extraction device |
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2018
- 2018-12-12 CN CN201822084940.XU patent/CN209856440U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11237083B1 (en) | 2020-07-16 | 2022-02-01 | The Government of the United States of America, as represented by the Secretary of Homeland Security | High volume sampling trap thermal extraction device |
| US11543333B2 (en) | 2020-07-16 | 2023-01-03 | The Government of the United States of America, as represented by the Secretary of Homeland Security | Thermal extraction apparatus with high volume sampling trap |
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