CN211652713U

CN211652713U - Sampling device of TVOC

Info

Publication number: CN211652713U
Application number: CN201922483117.0U
Authority: CN
Inventors: 王会芳; 王富强
Original assignee: Sgs Cstc Standards Technical Services Tianjin Co ltd
Current assignee: Sgs Cstc Standards Technical Services Tianjin Co ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-10-09
Anticipated expiration: 2029-12-31

Abstract

The utility model discloses a sampling device of TVOC, include: the TVOC prestoring cavity comprises a TVOC sample inlet and a TVOC recycling inlet; the TVOC sample introduction pipeline is communicated with the TVOC prestoring cavity, and a micro barometer is arranged on the inner wall of the TVOC sample introduction pipeline; the carrier gas pipeline is parallel to the TVOC sample injection pipeline and is arranged below the TVOC sample injection pipeline; the controller is electrically connected with the micro barometer; wherein, TVOC introduction pipeline includes: first TVOC introduction pipeline, second TVOC introduction pipeline and third TVOC introduction pipeline, both ends are provided with first introduction port and first appearance mouth respectively about first TVOC introduction pipeline, and both ends are provided with second introduction port and second appearance mouth respectively about the second TVOC introduction pipeline, and both ends are provided with third appearance mouth and third appearance mouth respectively about the third TVOC introduction pipeline. The utility model reduces the influence of the interference substances of the coexistence of the relative humidity and the adsorbent on the TVOC detection accuracy in the process of analysis and detection; the controller controls a plurality of TVOC sampling pipelines to realize automatic sampling.

Description

Sampling device of TVOC

Technical Field

The utility model belongs to the technical field of the TVOC detects, more specifically says, the utility model relates to a sampling device of TVOC.

Background

TVOC (total Volatile Organic Compounds) refers to an Organic matter with saturated vapor pressure of more than 133.32pa at room temperature, the boiling point of the Organic matter is 50-250 ℃, the Organic matter can exist in air in a form of evaporation at room temperature, and the Organic matter has toxicity, irritation, carcinogenicity and special smell, can affect skin and mucous membrane, and can cause acute damage to human body. The World Health Organization (WHO), national academy of sciences/national research council (NAS/NRC), etc., have emphasized that TVOC is an important class of air pollutants. The U.S. environmental agency (EPA) defines VOCs as: in addition to carbon monoxide, carbon dioxide, carbonic acid, metal carbides, carbonates and ammonium carbonate, any carbon-containing compound that participates in photochemical reactions in the atmosphere.

The technical equipment for detecting TVOC is high in requirement, and gas chromatography is generally adopted, but Fourier transform infrared spectroscopy, fluorescence spectroscopy, ion chromatography, reflection interference spectroscopy and the like are also adopted. Conventional gas chromatography detection of TVOC includes: the method comprises the steps of collecting through a Tenax-TA pipe of an adsorption pipe, installing the adsorption pipe on a thermal analyzer for heating, desorbing organic steam from an adsorbent, bringing the organic steam into a cold trap by carrier gas flow, pre-concentrating, quickly desorbing at a low flow rate, and entering capillary gas chromatography through a transmission line.

SUMMERY OF THE UTILITY MODEL

An object of the present invention is to solve at least the above problems or disadvantages and to provide at least the advantages which will be described later.

The utility model also aims at providing a TVOC sampling device, which reduces the adsorption and analysis steps by directly connecting the sampling device with the TVOC collection tank for sampling, thereby reducing the influence of the interference substances of the coexistence of relative humidity and adsorbent, etc. on the TVOC detection accuracy in the detection process; adopt the switch-on and closing of many sampling pipeline of controller control TVOC, realize autoinjection, moreover, many sampling pipeline can sweep the sampling pipeline and wash not need to detect a sample, can sweep the washing in unison again after finishing to multiunit sample detection, have improved TVOC's detection rate.

To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a sample introduction device of TVOC, comprising:

the TVOC prestoring cavity comprises a TVOC sample inlet and a TVOC recycling port, wherein the TVOC sample inlet is used for being communicated with a TVOC collecting tank, and the TVOC recycling port is communicated with a TVOC recycling device and is used for recycling the residual TVOC after detection;

the TVOC sample introduction pipeline is communicated with the TVOC prestoring cavity, and a micro barometer is arranged on the inner wall of the TVOC sample introduction pipeline;

the carrier gas pipeline is parallel to the TVOC sample injection pipeline and is arranged below the TVOC sample injection pipeline;

a controller electrically connected to the micro barometer;

wherein, TVOC introduction pipeline includes: first TVOC introduction pipeline, second TVOC introduction pipeline and third TVOC introduction pipeline, both ends are provided with first introduction port and first appearance mouth respectively about first TVOC introduction pipeline, both ends are provided with second introduction port and second appearance mouth respectively about the second TVOC introduction pipeline, both ends are provided with third appearance mouth and third appearance mouth respectively about the third TVOC introduction pipeline.

Preferably, wherein the micro barometer comprises a first micro barometer, a second micro barometer and a third micro barometer, the first micro barometer is arranged in the first TVOC sample introduction pipeline, the second micro barometer is arranged in the second TVOC sample introduction pipeline, and the third micro barometer is arranged in the third TVOC sample introduction pipeline.

Preferably, wherein, be provided with first sampling valve between first introduction port and the first TVOC injection pipeline, be provided with first appearance valve between first appearance mouth and the first TVOC injection pipeline, be provided with second sampling valve between second appearance mouth and the second TVOC injection pipeline, be provided with second appearance valve between second appearance mouth and the second TVOC injection pipeline, be provided with third appearance valve between third appearance mouth and the third TVOC injection pipeline, first appearance valve, second sampling valve, second appearance valve, third appearance valve and third appearance valve all are connected with the controller electricity to open or close through controller solenoid valve.

Preferably, the method further comprises the following steps: and the gas mixing cavity is arranged on the right side of the TVOC sampling pipeline and the carrier gas pipeline and communicated with the TVOC sampling pipeline and the carrier gas pipeline so as to mix the TVOC and the carrier gas and then enter the chromatographic column for TVOC detection.

Preferably, a carrier gas inlet and a carrier gas outlet are respectively arranged at the left side and the right side of the carrier gas pipeline, the carrier gas inlet is connected with a carrier gas source, and the carrier gas outlet is communicated with the gas mixing chamber.

Preferably, the diameters of the first TVOC sample introduction pipe, the second TVOC sample introduction pipe and the third TVOC sample introduction pipe are the same.

Preferably, the first sample injection valve, the first sample outlet valve, the second sample injection valve, the second sample outlet valve, and the third sample injection valve are all solenoid valves for controlling on/off of corresponding channels.

Preferably, the gas mixing chamber is provided with a gas outlet, and the gas outlet is communicated with the chromatographic column, so that the TVOC and the carrier gas are mixed and then enter the chromatographic column for TVOC detection.

Preferably, wherein, the TVOC introduction port with the TVOC prestores and is provided with the TVOC injection valve between the lateral wall of cavity, the TVOC retrieve the mouth with the TVOC prestores and is provided with the TVOC recovery valve between the diapire of cavity, the TVOC introduction valve with the TVOC recovery valve is control respectively the TVOC introduction port with the solenoid valve that the TVOC recovery port was opened or was closed, the TVOC introduction valve with the TVOC recovery valve all is connected with the controller electricity.

The utility model discloses at least, include following beneficial effect:

1. the TVOC prestoring chamber is arranged to provide TVOC for TVOC parallel detection experiment, and furthermore, as TVOC is a highly toxic organic matter, TVOC cannot be directly discharged into the air to other gas chromatography-detected gas after the detection experiment is finished, so that not only is the air polluted, but also the detection personnel is damaged by the highly toxic gas, and the residual TVOC detected by the TVOC recovery port is recovered;

2. the multiple pipelines are controlled by the controller, automatic sample introduction of TVOC is realized, furthermore, when different samples are detected, gas purging work needs to be carried out on the front detection pipeline, the workload is increased, the detection efficiency is reduced, different TVOC samples can be detected through different pipelines, and the sample introduction device is uniformly purged after all the detections are finished;

3. detecting the TVOC entering amount of a corresponding pipeline through a micro barometer to realize automatic quantitative TVOC sample introduction;

4. through setting up the gas mixing chamber, the TVOC that realizes entering the gas mixing chamber from different pipelines joins with the carrier gas and then gets into the chromatographic column and carries out quantitative determination to TVOC.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

Fig. 1 is a schematic structural diagram of a sample injection device of a TVOC in an embodiment of the present invention;

fig. 2 is a schematic connection diagram of the controller and each structure controlled by the controller in the sample injection device of TVOC according to an embodiment of the present invention.

Detailed Description

The present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.

It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.

All the structures or control methods which are not specially indicated in the utility model are the structures or control methods which are commonly used in the field.

Fig. 1 and fig. 2 show an implementation form of a sample feeding device of TVOC according to the present invention, which includes:

the TVOC prestoring chamber 1 comprises a TVOC sample inlet and a TVOC recycling port, wherein the TVOC sample inlet is used for being communicated with a TVOC collecting tank (not shown in the figure), and the TVOC recycling port is communicated with a TVOC recycling device (not shown in the figure) and is used for recycling the residual TVOC after detection;

the TVOC sample introduction pipeline is communicated with the TVOC prestoring cavity 1, and a micro barometer is arranged on the inner wall of the TVOC sample introduction pipeline;

a carrier gas pipeline 5 parallel to the TVOC sampling pipeline 2 and disposed below the TVOC sampling pipeline 2;

a controller 7 electrically connected to the micro barometer;

wherein, TVOC introduction pipeline includes: first TVOC introduction pipeline 2, second TVOC introduction pipeline 3 and third TVOC introduction pipeline 4, both ends are provided with first introduction port and first appearance mouth respectively about first TVOC introduction pipeline 2, both ends are provided with second introduction port and second appearance mouth respectively about second TVOC introduction pipeline 3, both ends are provided with third appearance mouth and third appearance mouth respectively about third TVOC introduction pipeline 4. A first sample valve 200 is arranged between the first sample inlet and the first TVOC sample introduction pipeline 2, a first sample outlet valve 210 is arranged between the first sample outlet and the first TVOC sample introduction pipeline, a second sample introduction valve 300 is arranged between the second sample inlet and the second TVOC sample introduction pipeline 3, a second sample outlet valve 310 is arranged between the second sample outlet and the second TVOC sample introduction pipeline 3, a third sample introduction valve 400 is arranged between the third sample inlet and the third TVOC sample introduction pipeline 4, and a third sample outlet valve 400 is arranged between the third sample outlet and the third TVOC sample introduction pipeline 4, wherein the first sample introduction valve 200, the first sample outlet valve 210, the second sample introduction valve 300, the second sample introduction valve 310, the third sample introduction valve 400 and the third sample introduction valve 410 are electrically connected with the controller 7 so as to be opened or closed through the electromagnetic valve of the controller 7.

Wherein, the TVOC introduction port with TVOC prestores and is provided with TVOC introduction valve 100 between the lateral wall of cavity, the TVOC recovery port with TVOC prestores and is provided with TVOC recovery valve 110 between the diapire of cavity, TVOC introduction valve 100 with TVOC recovery valve 110 is control respectively the TVOC introduction port with the solenoid valve that the TVOC recovery port was opened or was closed, TVOC introduction valve 100 with TVOC recovery valve 110 all is connected with the controller electricity.

In this technical scheme, miniature barometer includes first miniature barometer 220, the miniature barometer 320 of second and the miniature barometer 420 of third, first miniature barometer 220 sets up in the first TVOC injection pipeline 2, the miniature barometer 320 of second sets up in the second TVOC injection pipeline 3, the miniature barometer 420 of third sets up in the third TVOC injection pipeline 4. Wherein, each micro barometer is connected with the CPU of the gas chromatograph in a communication way and is electrically connected with the controller, the TVOC collected by the TVOC collecting tank is collected in the TVOC pre-storing chamber through the TVOC pre-storing chamber, the TVOC pre-storing chamber is firstly pumped into a vacuum system through a vacuum pump, the TVOC of the TVOC collecting tank can be naturally input into the TVOC pre-storing chamber through the action of pressure difference, then the controller controls the TVOC sample introduction valve 100 and the TVOC recovery valve 110 in the TVOC pre-storing chamber to be closed, TVOC sample introduction parameters are set on the CPU of the display screen according to the detection requirement of the gas chromatograph, like sample introduction quantity, according to PV (nRT), the pressure value of the sample introduction gas is directly obtained according to the sample introduction volume quantity, when the micro barometer receives the signal of the CPU, the controller controls the sample introduction valve of the corresponding TVOC sample introduction pipeline to be opened to start sample introduction, when the gas pressure value detected by the micro barometer reaches the set value, the controller controls the sampling valve of the corresponding TVOC sampling pipeline to be closed, and simultaneously controls the sample outlet valve of the same TVOC sampling pipeline to be opened, the carrier gas outlet of the carrier gas pipeline is opened, and the carrier gas and the TVOC simultaneously enter the gas chromatographic column to be detected by gas chromatography.

In the technical scheme, one of a first TVOC sample introduction pipeline, a second TVOC sample introduction pipeline and a third TVOC sample introduction pipeline is adopted for one-time test, the TVOC sample introduction principle is that the TVOC sample introduction channel is pre-vacuumized, a corresponding valve of each TVOC sample introduction pipeline is controlled to be in a connection state or a closing state by a controller, as shown in figure 2, the simple connection state of the controller and a device controlled by the controller is shown, when the TVOC sample introduction is required to be carried out from the first TVOC sample introduction pipeline, the controller controls to open the first sample introduction valve 200, so that the first sample introduction valve 200 and the first TVOC sample introduction pipeline are in a connection state, the controller controls other valves to be in a closing state, when the gas pressure value of the first TVOC sample introduction channel reaches a set value, the controller controls the first sample introduction valve 200 to be in a closing state, the first sample discharge valve is in a connection state, so that the TVOC and carrier gas enter a gas chromatography column for gas chromatography quantitative detection, if the parallel test of the same detection sample is needed, the first TVOC sample introduction pipeline needs to be cleaned without detecting a sample, the second TVOC sample introduction pipeline is adopted, the third TVOC sample introduction pipeline is used for detection, and the specific automatic sample introduction method is the same as the above principle of sample introduction from the first TVOC sample introduction pipeline. The specific connection method and control method for opening or closing all valves belonging to the electromagnetic valve controlled by the controller are common electric connection methods and methods for opening and closing the power-on electromagnetic valve and the power-off electromagnetic valve in the field of controllers, and are not described herein again.

In another technical scheme, the utility model discloses a TVOC's sampling device still includes: and the gas mixing cavity 6 is arranged on the right side of the TVOC sample introduction pipeline and the carrier gas pipeline 5 and is communicated with the TVOC sample introduction pipeline and the carrier gas pipeline 5 so as to mix the TVOC and the carrier gas and then enter the chromatographic column for TVOC detection. The gas mixing chamber 6 is provided with a gas outlet which is communicated with the chromatographic column so that the TVOC and the carrier gas are mixed and then enter the chromatographic column for TVOC detection. An electromagnetic valve 600 is arranged between the gas outlet and the side wall of the gas mixing chamber 6, and the electromagnetic valve 600 is also electrically connected with the controller. The gas TVOC entering from the TVOC sample introduction pipe is mixed with the carrier gas by the gas mixing chamber and enters the chromatography column together with the carrier gas from the solenoid valve 600. Through the setting of gas mixing chamber 6, can get into the chromatographic column after can mixing TVOC gas and carrier gas homogeneous mixing and detect, promoted the detection precision.

In another technical scheme, a carrier gas inlet and a carrier gas outlet are respectively arranged on the left side and the right side of the carrier gas pipeline 5, the carrier gas inlet is connected with a carrier gas source, and the carrier gas outlet is communicated with the gas mixing chamber. A carrier gas sample injection valve 500 is arranged between the carrier gas inlet and the carrier gas pipeline 5, a carrier gas sample outlet valve 510 is arranged between the carrier gas outlet and the carrier gas pipeline, wherein the carrier gas sample injection valve 500 and the carrier gas sample outlet valve 510 are both one-way solenoid valves and are electrically connected with the controller 7.

The controller controls the moment of opening the carrier gas sampling valve to be the moment when the pressure value of the TVOC air inlet pipeline reaches a set value, the TVOC sampling valve of the corresponding TVOC air inlet pipeline is closed and the TVOC sampling valve is opened; the number of the controllers in the invention is that one controller controls the corresponding valve to be opened or closed through different circuits, thus saving the installation space and the instrument cost. Or different valves may be controlled by different controllers.

In another technical scheme, the diameters of the first TVOC sample introduction pipeline, the second TVOC sample introduction pipeline and the third TVOC sample introduction pipeline are the same. The structure is unified, and the installation or the management are convenient.

The number of apparatuses and the scale of the process described here are intended to simplify the description of the present invention. Applications, modifications and variations of the sample introduction device of the TVOC of the present invention will be apparent to those skilled in the art.

As described above, according to the sampling device of TVOC of the present invention, by setting the TVOC pre-storage chamber, the TVOC is provided for the TVOC parallel detection experiment, and furthermore, since the TVOC is a highly toxic organic substance, the TVOC cannot be directly discharged into the air to other gas chromatography-detected gas after the detection experiment is completed, which not only pollutes the air, but also causes highly toxic hazard to the detection personnel, so the residual TVOC is recovered through the TVOC recovery port; the multiple pipelines are controlled by arranging the controller and the miniature barometer, so that automatic quantitative sample introduction of the TVOC is realized. While embodiments of the invention have been disclosed above, it is not intended to be limited to the applications listed in the specification and the examples. It can be applicable to various and be fit for the utility model discloses a field completely. Additional modifications will readily occur to those skilled in the art. The invention is therefore not to be limited to the specific details and illustrations shown and described herein, without departing from the general concept defined by the claims and their equivalents.

Claims

1. The utility model provides a sampling device of TVOC which characterized in that includes:

a controller electrically connected to the micro barometer;

2. The sample introduction device of TVOC of claim 1, wherein said micro barometer comprises a first micro barometer, a second micro barometer, and a third micro barometer, said first micro barometer being disposed in said first TVOC sample introduction tube, said second micro barometer being disposed in said second TVOC sample introduction tube, and said third micro barometer being disposed in said third TVOC sample introduction tube.

3. The TVOC sampling device according to claim 1, wherein a first sampling valve is disposed between the first sampling port and the first TVOC sampling pipe, a second sampling valve is disposed between the second sampling port and the second TVOC sampling pipe, a third sampling valve is disposed between the third sampling port and the third TVOC sampling pipe, and a third sampling valve is disposed between the third sampling port and the third TVOC sampling pipe, wherein the first sampling valve, the second sampling valve, the third sampling valve and the third sampling valve are electrically connected to a controller for opening or closing through an electromagnetic valve of the controller.

4. The sample injection device of TVOC of claim 1, further comprising: and the gas mixing cavity is arranged on the right side of the TVOC sampling pipeline and the carrier gas pipeline and communicated with the TVOC sampling pipeline and the carrier gas pipeline so as to mix the TVOC and the carrier gas and then enter the chromatographic column for TVOC detection.

5. The TVOC sample introduction device according to claim 4, wherein a carrier gas inlet and a carrier gas outlet are respectively provided at left and right sides of the carrier gas pipeline, the carrier gas inlet is connected with a carrier gas source, and the carrier gas outlet is communicated with the gas mixing chamber.

6. The TVOC sampling device of claim 1, wherein the first TVOC sampling conduit, the second TVOC sampling conduit and the third TVOC sampling conduit have the same diameter.

7. The sampling device of TVOC of claim 3, wherein the first sampling valve, the first sample outlet valve, the second sampling valve, the second sample outlet valve and the third sampling valve are all solenoid valves controlling the on-off of the corresponding channels.

8. The TVOC sample introduction device according to claim 4, wherein the gas mixing chamber is provided with a gas outlet, and the gas outlet is communicated with the chromatographic column so that the TVOC and the carrier gas are mixed and then enter the chromatographic column for TVOC detection.

9. The TVOC sampling device of claim 1, wherein a TVOC sampling valve is arranged between the TVOC sampling port and the side wall of the TVOC pre-storing chamber, a TVOC recovery valve is arranged between the TVOC recovery port and the bottom wall of the TVOC pre-storing chamber, the TVOC sampling valve and the TVOC recovery valve are electromagnetic valves for controlling the TVOC sampling port and the TVOC recovery port to be opened or closed, respectively, and both the TVOC sampling valve and the TVOC recovery valve are electrically connected with a controller.