CN214334800U - Glass liner tube used in volatile organic compound detection process - Google Patents

Abstract

The utility model belongs to the technical field of environmental monitoring, concretely relates to used glass bushing pipe in volatile organic compounds testing process. The utility model provides an used glass bushing pipe in volatile organic compounds testing process, including the bushing pipe body, its characterized in that, the bushing pipe in supreme first glass cotton layer, packing layer, the cotton layer of second glass of having set gradually from bottom to top. The opening at the uppermost end of the liner tube body is provided with a liner tube plug matched with the liner tube, the top of the liner tube plug is of a plane structure with a plurality of holes, the middle part of the liner tube plug is of a hollow structure, and the lower part of the liner tube plug is of an open structure. The liner tube provided by the utility model not only achieves the purpose of desorbing the sample, but also ages the filler in the liner tube under the conditions of high temperature and carrier gas introduction after the desorption of the sample inlet; adopt foretell bushing pipe for solid adsorbent adsorbs the sampling, do not possess under the condition of thermal desorption appearance and the ageing device of adsorption tube, can also survey the volatile organic compounds in the air, can select this bushing pipe, great saving the cost.

Description

Glass liner tube used in volatile organic compound detection process

Technical Field

The utility model belongs to the technical field of environmental monitoring, concretely relates to used glass bushing pipe in volatile organic compounds testing process.

Background

The structure of the existing commercial glass liner tube is as follows: the glass tube with the bottom is open, and a through hole is formed in the bottom of the glass tube. As a component of a sample inlet of a gas chromatograph or a gas chromatograph-mass spectrometer, a sample is vaporized in a glass liner tube, and the interior of the sample is not filled with filler and has no function of adsorbing volatile organic compounds.

When volatile organic compounds in air are collected, a stainless steel adsorption tube with a filler is mostly adopted for collection, after a sample is collected by adopting the device and the method, a thermal desorption instrument is needed to heat the adsorption tube, nitrogen is introduced for desorption, and then the gas chromatograph or the gas chromatograph mass spectrometer can be used for detection, and the stainless steel adsorption tube and the thermal desorption instrument are expensive and have higher cost.

The prior glass liner tube has patent technical reports as follows:

CN109752475A provides a gas chromatography glass liner tube structure, including pipe wall (1), inside lining cup (2) and syringe needle (10), its characterized in that, the inside of pipe wall (1) is seted up bears chamber (9), and the bottom of pipe wall (1) is provided with chromatographic column connection port (5), the inside of pipe wall (1) is provided with locating piece (4), and is provided with quartz cotton cushion (3) on locating piece (4), be provided with inside lining cup (2) on quartz cotton cushion (3), the top of inside lining cup (2) is provided with syringe needle (10), the inside of pipe wall (1) is opened and is equipped with spacing groove (8), and the inside of spacing groove (8) is provided with gag lever post (21), the other end of gag lever post (21) with inside lining cup (2) fixed connection, regulation and control mouth (6) have all been seted up to the both sides of pipe wall (1), and a locking rod (7) is inserted into the regulating port (6), and one end of the locking rod (7) is positioned at the top end of the limiting rod (21).

The technical scheme solves the defects that the position of the inner lining cup is difficult to keep stable and is not limited in the prior art, so that the position of the inner lining cup deviates.

However, the above solution and other solutions in the prior art are not disclosed as to how to make the liner tube capable of sampling and measuring samples, and also can be used for the liner tube for detecting the volatile organic compounds by thermal analysis without a thermal desorption instrument.

Disclosure of Invention

In order to solve the technical problem, the utility model provides a can sample, can survey the appearance again, can also be under the condition that does not have the thermal desorption appearance the used glass bushing pipe in the volatile organic compounds testing process of thermal analysis.

The utility model provides an used glass bushing pipe in volatile organic compounds testing process, including the bushing pipe body, there is glass at the bottom of bushing pipe body, and has a round hole in the positive intermediate position department at the bottom of this glass, and the cotton layer of first glass, packing layer, the cotton layer of second glass has set gradually in the bushing pipe from bottom to top.

Preferably, the top of the liner plug is a planar structure with a plurality of holes, the middle part of the liner plug is a hollow structure, and the lower part of the liner plug is an open structure.

Preferably, the lining pipe plug is internally provided with a telescopic metal rod.

Preferably, the lower part of the metal rod is provided with a baffle plate which is a round or rectangular metal sheet.

Preferably, the baffle is a perforated baffle.

Preferably, the thickness ratio of the first glass wool layer, the packing layer and the second glass wool layer is 1-3: 4-10: 1 to 3.

Preferably, the lining pipe plug is a teflon plug or a silica gel plug.

Preferably, a spring is arranged in the liner pipe plug, and the lower bottom of the spring is connected with a baffle plate with a hole.

Preferably, the first glass wool layer and the second glass wool layer have the same thickness.

Preferably, the packing layer is a TENAX packing layer.

Adopt the utility model discloses a bushing pipe for gas chromatograph and gas chromatograph mass spectrometer's introduction port's reposition of redundant personnel/do not reposition of redundant personnel general glass bushing pipe can reuse after having used up to change, take out the glass cotton in the bushing pipe, then pack into a small amount of glass cotton, proper amount TENAX packs into the repacking, proper amount glass cotton is packed into again, put into muffle furnace or gas chromatograph/gas chromatograph mass spectrometer introduction port in the high temperature dry by the fire the sampling that the impurity back is used for volatility has the pollutant in ambient air and the unorganized waste gas, put into gas chromatograph or gas chromatograph mass spectrometer introduction port with this bushing pipe and desorb after finishing the collection, survey.

The beneficial effects of the utility model reside in that:

(1) the liner tube provided by the utility model not only achieves the purpose of desorbing the sample, but also ages the filler in the liner tube under the conditions of high temperature and carrier gas introduction after the desorption of the sample inlet;

(2) the liner tube is adopted for adsorption sampling of the solid adsorbent, volatile organic compounds in air can be measured under the condition that a thermal desorption instrument and an adsorption tube aging device are not provided, and the liner tube can be selected, so that the cost is greatly saved;

(3) the liner tube provided by the utility model can be reused, and the glass wool filler in the liner tube can be sucked out after use, and the new glass wool and filler are replaced, so that the purpose of recycling is achieved;

(4) the glass wool and the filler can be easily blown out through the ear washing ball, so that the purpose of replacing the glass wool and the filler is achieved.

Drawings

Fig. 1 is a schematic structural view of a liner tube body in embodiment 1 of the present invention;

fig. 2 is a schematic structural view of a liner plug in embodiment 1 of the present invention;

fig. 3 is a schematic structural view of a liner plug in embodiment 2 of the present invention;

fig. 4 is a schematic structural view of a liner plug in embodiment 3 of the present invention;

in the figure, 1-liner tube body, 2-first glass wool layer, 3-filler layer, 4-second glass wool layer, 5-liner tube plug, 6-metal rod, 7-baffle plate, 8-spring, 501-first rotating sleeve, 502-second rotating sleeve and 503-inner metal rod.

Detailed Description

In order to enable those skilled in the art to better understand the present invention, the present invention will now be described in further detail with reference to the following embodiments.

Example 1

Used glass bushing pipe in the volatile organic compounds testing process, including bushing pipe body 1, first glass cotton layer 2, packing layer 3, second glass cotton layer 4 have set gradually in the bushing pipe from bottom to top.

A liner tube plug 5 matched with the liner tube is arranged at the opening at the uppermost end of the liner tube body 1, the top of the liner tube plug 5 is of a plane structure with a plurality of holes, the middle part of the liner tube plug is of a hollow structure, and the lower part of the liner tube plug is of an open structure; namely, the liner tube is integrally of a hollow cylindrical structure with an upper top surface;

inside the liner plug 5 is provided a telescopic metal rod 6.

The lower part of the metal rod 6 is provided with a circular blocking piece 7 made of metal, and the blocking piece 7 is provided with a hole so as to ensure that the blocking piece 7 can well play a role of blocking the second glass wool layer 4 from moving upwards along with the airflow;

the thickness ratio of the first glass wool layer 2 to the filler layer 3 to the second glass wool layer 4 is 1: 4: 1; the total height of the first glass wool layer 2, the filler layer 3 and the second glass wool layer 4 does not exceed 2/3 of the height of the liner tube;

the lining pipe plug 5 is a silica gel plug, and the filler layer 3 is a TENAX filler layer 3.

The utility model discloses a bushing pipe is when using, goes on according to following method:

during sampling, the air inlet direction is from B to A.

When the sample is put into a sample inlet for desorption, the direction of the carrier gas is from A to B.

The method comprises the specific operation that when a sample is collected, the temperature of a sample inlet can be reduced to 35 ℃, after the sample is collected, when the sample is ready to be measured, the flow rate of a gas chromatograph column is closed, the liner tube is installed in the sample inlet and then installed, the flow rate of the column is opened, a manual sample introduction and measurement method is set on instrument software, then the temperature of the sample inlet is manually set to an appropriate temperature between 250 ℃ and 350 ℃, a start key of the gas chromatograph is clicked to measure the sample, after the sample measurement is finished, the temperature of the sample inlet is set to 35 ℃ again, after the temperature reaches 35 ℃, the flow rate of the column is closed, the liner tube is taken out, and a liner tube is replaced to carry out the same operation.

Example 2

The difference from the embodiment 1 is that in the embodiment 2, the spring 8 is arranged at the lower bottom of the upper top of the liner plug 5, and the uppermost end of the spring 8 is connected with the lower bottom surface of the upper top of the liner plug 5; the lowest end of the spring 8 is connected with the metal baffle 7.

The rest of the structure is the same as in example 1.

Example 3

The difference from embodiment 1 is that in embodiment 3, a first rotating sleeve 501 is disposed at a central position of an upper surface of an upper top portion of a liner plug 5, the first rotating sleeve 501 penetrates through the upper top surface of the liner plug 5, the first rotating sleeve 501 is engaged with the upper top surface of the liner plug 5, a second rotating sleeve 502 is sleeved in the first rotating sleeve 501, the second rotating sleeve 502 is located inside the liner plug 5, an external thread is disposed at a lower portion of the first rotating sleeve 501, an internal thread is disposed at a lower portion of the second rotating sleeve 502, an inner metal rod 503 is disposed at a lowermost portion of the first rotating sleeve 501, and when the first rotating sleeve 501 is rotated, a position of the inner metal rod 503 below the first rotating sleeve 501 is continuously pushed downward until the metal blocking piece 7 can block the second glass wool layer 4.

The above embodiments are only some of the solutions, and other ways can be adopted to achieve the purpose of fixing the second glass wool layer, and the above changes also fall within the protection scope of the present invention.

Claims (10)

1. The glass liner tube used in the volatile organic compound detection process comprises a liner tube body and is characterized in that a first glass wool layer, a packing layer and a second glass wool layer are sequentially arranged in the liner tube from bottom to top.

2. The glass liner tube for detecting VOCs of claim 1, wherein the opening at the uppermost end of the liner tube body is provided with a liner tube plug matched with the liner tube, the top of the liner tube plug is of a planar structure with a plurality of holes, the middle of the liner tube plug is of a hollow structure, and the lower part of the liner tube plug is of an open structure.

3. The glass liner for use in voc emission testing process according to claim 2, wherein said liner plug is internally provided with a retractable metal rod.

4. The glass liner tube for detecting VOCs of claim 3, wherein the lower portion of the metal rod has a baffle plate, and the baffle plate is circular, rectangular or elliptical; the baffle is a metal sheet.

5. The glass liner for use in voc detection process according to claim 4, wherein said baffle is a perforated baffle.

6. The glass liner tube for detecting the volatile organic compounds according to claim 1, wherein the ratio of the thicknesses of the first glass wool layer, the filler layer and the second glass wool layer is 1-3: 4-10: 1 to 3.

7. The glass liner tube used in the detection process of volatile organic compounds according to claim 2, wherein the liner tube plug is a teflon plug or a silica gel plug.

8. The glass liner tube for detecting volatile organic compounds according to claim 2, wherein the liner tube plug is provided with a spring inside, and the bottom of the spring is connected with a baffle plate with a hole.

9. The glass liner of claim 1, wherein the first glass wool layer and the second glass wool layer are the same thickness.

10. The glass liner for use in voc detection process of claim 1, wherein the packing layer is a TENAX packing layer.

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