CN112033765A - High-efficient low VOC sampling device that decreases - Google Patents

Abstract

The invention discloses a high-efficiency low-loss VOC sampling device, which comprises: the cold cavity is a cavity body which can be used for providing a low-temperature environment, and the upper end of the cold cavity is provided with an opening; a Tenax tube stent comprising: support and connection are held the pipe at the Tenax of support lower extreme, run through the up end and the lower terminal surface of support, have seted up the drill way, and the drill way link up Tenax and holds the pipe, and Tenax pipe support can wholly or partially place in cold intracavity, and when Tenax pipe support part was placed in cold intracavity, the support born in the open-ended edge, and Tenax holds the pipe and passes the opening and hold in cold intracavity portion. The air faucet is inserted into the hole, and the upper end of the air faucet is connected with the sampling gas; the Tenax tube is contained in the Tenax containing tube, and the upper end of the Tenax tube is connected with the lower end of the air tap. The invention relates to a high-efficiency low-loss VOC sampling device with refrigeration temperature control and series adsorption functions.

Description

High-efficient low VOC sampling device that decreases

Technical Field

The invention relates to the technical field of VOC sampling, in particular to a high-efficiency low-loss VOC sampling device with refrigeration temperature control and series adsorption functions.

Background

VOCs are volatile organic compounds that have a tremendous impact on human health. When the VOC gas reaches a certain concentration, people can feel headache, nausea, vomit, hypodynamia and the like in a short time, and can be convulsion and coma in severe cases, and the liver, the kidney, the brain and the nervous system of people can be injured, so that serious consequences such as hypomnesis are caused. The VOC sampler is widely applied to the determination of volatile organic compounds in the departments of environmental protection, sanitation, labor, security inspection, military, research and education and the like. In VOC gas sampling and treatment, the Tenax tube adsorption method is one of the better and more extensive effective measuring methods.

The adsorption efficiency of VOC gas is greatly influenced by temperature, the constant temperature is kept, the adsorption efficiency of a Tenax tube is favorably improved, the adsorption temperature of the existing sampler is generally reduced by adopting blue ice or ice blocks and other modes, the method cannot accurately control the constant temperature environment, and the phenomenon of uneven temperature is easily caused.

The Tenax pipe adsorbs that there is the absorption to penetrate the phenomenon in the VOC gas, and the current VOC sample thief adsorbs can't satisfy and penetrates the experiment requirement, has the great error of absorption data result.

4. The adsorption device of the existing VOC sampler increases the assembly difficulty of the Tenax tube in the adsorption device under the condition of meeting the standard requirements of air tightness, adsorption capacity and the like, is not convenient to disassemble and assemble when the Tenax tube needs to be replaced, and is easy to cause damage to the Tenax tube, so that the adsorption effect is greatly reduced.

5. According to the diversity and complexity of the components of the VOC gas, the molecular structures of the VOC substances with different components have larger difference, and the existing VOC sampler adsorption device can not meet the standard sampling requirements in terms of compatibility and accuracy.

Therefore, a high-efficiency low-loss VOC sampling device with refrigeration, temperature control and series adsorption functions is needed.

Disclosure of Invention

The invention aims to provide a high-efficiency low-loss VOC sampling device with refrigeration temperature control and series adsorption functions.

In order to achieve the purpose, the technical scheme provided by the invention is as follows: there is provided a high efficiency low loss VOC sampling device comprising:

the cold cavity is a cavity body which can be used for providing a low-temperature environment, and the upper end of the cold cavity is provided with at least one opening;

a Tenax tube stent comprising: the support and the Tenax containing pipe connected to the lower end of the support penetrate through the upper end face and the lower end face of the support, orifices are formed in the upper end face and the lower end face of the support, the orifices penetrate through the Tenax containing pipe, the Tenax pipe support can be integrally or partially placed in the cold cavity, when the Tenax pipe support is partially placed in the cold cavity, the support is borne at the edge of the opening, and the Tenax containing pipe penetrates through the opening and is contained in the cold cavity.

The air faucet is inserted into the hole, and the upper end of the air faucet is connected with the sampling gas or the gas pump;

the Tenax tube is contained in the Tenax containing tube, and the upper end of the Tenax tube is connected with the lower end of the air tap.

Still include a sealed heat insulating mattress, sealed heat insulating mattress locates the support with between the opening, the heat insulating mattress includes two-layer structure, a lower floor's rubber seal ring layer, the upper strata is a thermal-insulated cotton layer, just rubber seal ring layer with thermal-insulated cotton layer laminating is in the same place.

The number of the orifices is two;

the Tenax containing pipe is a U-shaped Tenax containing pipe, two pipe openings of the U-shaped Tenax containing pipe are respectively butted with the two hole openings, the U-shaped Tenax containing pipe comprises a first Tenax containing pipe and a second Tenax containing pipe, and the first Tenax containing pipe and the second Tenax containing pipe respectively contain one of the Tenax pipes.

The U-shaped Tenax accommodating tube further comprises a connecting seat, and the lower ends of the first Tenax accommodating tube and the second Tenax accommodating tube are communicated through the connecting seat.

The cold chamber is internally provided with a Peltier refrigerating unit which comprises a Peltier, a heat conducting sheet and a heat conducting fan, wherein one side of the Peltier refrigerating unit is arranged in the cold chamber, the heat conducting sheet is connected with one side of the Peltier refrigerating unit, and the heat conducting fan is arranged above the heat conducting sheet.

The control unit is electrically connected with the Peltier refrigerating unit and the temperature sensing unit respectively, a temperature probe of the temperature sensing unit is arranged in the cold cavity and used for detecting temperature information in the cold cavity and sending the temperature information to the control unit, and the control unit adjusts the refrigerating power of the Peltier refrigerating unit according to the temperature information.

The outer wall of air cock is equipped with an at least first sealing washer groove, be equipped with first sealing washer in the first sealing washer groove, work as the air cock peg graft in during the drill way, first sealing washer is used for with the inside and external environment of Tenax holding tube are airtight.

The main body of the air faucet is of a tubular structure, and an inverted circular truncated cone structure is formed on the outer wall of the main body.

The lower end of the air faucet enters the inside of the upper end of the Tenax tube and is connected with the upper end of the Tenax tube, a second sealing ring groove is formed in the periphery of the outer wall of the lower end of the air faucet, a second sealing ring is arranged in the second sealing ring groove, and the part of the lower end of the air faucet entering the upper end of the Tenax tube is connected with the inside of the upper end of the Tenax tube in a sealing mode through the second sealing ring.

The upper end of the connecting seat is provided with an interface which is communicated with each other and is respectively connected with the lower ends of the first Tenax containing tube and the second Tenax containing tube, and the lower end of the connecting seat is fixed on a mounting plate.

1. The invention has the serially connected adsorption Tenax tubes, realizes the synchronous adsorption of the serially connected (penetrating tubes) and completely meets the requirement of the sampling standard.

2. The adsorption device has excellent compatibility, and the Tenax pipes with different specifications and filling materials can be conveniently installed, so that the applicability is strong.

3. The cold cavity is made of heat insulation materials and is provided with the heat insulation layer, so that the heat capacity in the constant temperature cavity can be effectively reduced, the heat conduction is slowed down, and the loss of the temperature in the Tenax tube is reduced.

4. The invention simplifies the structural design of the device, is more convenient and quicker when the Tenax tube is replaced, and has better use experience of the sampler in the sampling work.

5. The invention controls the temperature through the Peltier to refrigerate and control the fan to improve the heat exchange efficiency of the air in the adsorption tube, achieves the effect of quick refrigeration and temperature control, reduces the influence of the quick change of the external environment on the sampling temperature, and improves the adsorption effect of the device.

The invention will become more apparent from the following description when taken in conjunction with the accompanying drawings, which illustrate embodiments of the invention.

Drawings

Fig. 1 is a schematic diagram of one embodiment of the high efficiency low loss VOC sampling device of the present invention.

Fig. 2 is a schematic cross-sectional view of the high efficiency low loss VOC sampling device of fig. 1.

Fig. 3 shows a schematic view of a Tenax tube stent.

FIG. 4 is a schematic cross-sectional view in the A-A direction of the Tenax tube stent shown in FIG. 3.

Detailed Description

Embodiments of the present invention will now be described with reference to the drawings, wherein like element numerals represent like elements throughout.

As described above, referring to the embodiment shown in fig. 1, the present invention provides a high-efficiency low-loss VOC sampling device 100, in the embodiment shown in fig. 1, it is a schematic view of an embodiment of a two-way VOC sampling device, there is a top cover 10 above the device, for better illustration, the top cover 10 is shown in an open state, the two-way VOC sampling device which can work independently can be seen clearly, and the first way VOC sampling device and the second way VOC sampling device can sample simultaneously or in a time-sharing manner. As shown in fig. 1, two supports 21 of two Tenax tube holders can be clearly seen (the two supports 21 belong to a first path of VOC sampling device and a second path of VOC sampling device respectively), each support 21 is provided with two air nozzles 3, among the air nozzles, the air nozzle connected with the air nozzle belongs to an air nozzle allowing a sampling air flow to enter, the air nozzle connected with the silicone tube 11 belongs to an air pump connected with the silicone tube 11, and the air pump is a component for allowing the sampling air flow to provide power.

Referring to the embodiment shown in fig. 2, the invention provides a high-efficiency low-loss VOC sampling device 100, wherein a cold chamber 1 is formed inside the device, the cold chamber 1 is a chamber which can be used for providing a low-temperature environment, the upper end of the cold chamber 1 is provided with at least one opening, the opening is an opening through which the cold chamber 1 communicates with the outside, for example, a Tenax tube support 2 which will appear below enters the inside of the cold chamber 1; for example, as shown in fig. 1, the embodiment is a two-way VOC sampling device, each way of VOC sampling device comprises one Tenax tube holder 2, so that two openings are required to be formed at the upper end of the cold chamber 1, and one Tenax tube holder 2 is arranged at each opening. That is, the first path of VOC sampling device and the second path of VOC sampling device of the two-path VOC sampling device may share one of the cold chambers 1, or two independent cold chambers may be used.

Referring to fig. 2, 3, 4, the Tenax tube stent 2 comprises: a support 21 and a Tenax containing tube 22 connected to the lower end of the support 21, wherein the support 21 and the Tenax containing tube 22 are made of stainless steel and are connected together, and how the support 21 and the Tenax containing tube 22 are connected together will be described below by way of example.

Referring to fig. 4, fig. 4 is a schematic cross-sectional view of a Tenax tube holder, wherein an aperture is formed through the upper end surface and the lower end surface of the support base 21, the aperture penetrates through the Tenax accommodating tube 22, the Tenax tube holder 2 can be wholly or partially placed in the cold chamber 1, when the Tenax tube holder 2 is partially placed in the cold chamber 1, the support base 21 is supported at the edge of the opening, and the Tenax accommodating tube 22 penetrates through the opening and is accommodated inside the cold chamber 1.

It should be noted that the support 21 functions as an intermediate connector, the opening of the upper end surface of the support 21 is used for inserting the air faucet 3, and the opening of the lower end surface of the support 21 is used for inserting the Tenax tube. Therefore, in the present disclosure, the support 21 is an object having a larger inertia (larger mass) than the Tenax accommodating tube 22 and the air faucet 3, so as to achieve the purpose of making the air faucet 3 have high stability during plugging, so that the operation is more convenient, and the usability, operability and humanization degree of the device during use are improved.

Now, the advantage of designing the support 21 as an object with a relatively large inertia (large mass) is clarified, and if the support 21 is placed in the cold chamber 1, the support 21 can dissipate more refrigeration energy and increase the energy consumption of the device because the support 21 has a relatively large mass, so the support 21 is placed outside the cold chamber 1, that is, the support 21 is placed at the edge of the opening, and therefore the support 21 is in a normal temperature state, so the energy consumption of the cold chamber 1 is not increased, the cruising ability of the device is reduced, and the air nozzle 3 is conveniently inserted, so the design is more energy-saving and humanized.

It should be noted that the purpose of the Tenax bracket 2 is to better protect the Tenax tube, so that the Tenax tube can be well kept in a predetermined state during sampling to improve the stability and accuracy of sampling, and after sampling is completed, the Tenax bracket 2 and the Tenax tube are stored and transported together, so that the Tenax tube can be kept in a low-temperature state conveniently, and VOC adsorbed in the Tenax tube is not released in advance.

In this embodiment, when the Tenax holder 2 is placed in the cold chamber 1, it is partially placed in the cold chamber 1, the support 21 is supported at the edge of the opening, and only the Tenax accommodating tube 22 is inserted through the opening and accommodated inside the cold chamber 1, in this embodiment, since the Tenax accommodating tube 22 is placed in the cold chamber 1 and it is desired to maintain a low temperature state, and the support 21 is in a normal temperature state outside the cold chamber 1, a thermal insulation layer may be provided between the support 21 and the Tenax accommodating tube 22, which is configured to reduce the thermal conduction between the support 21 and the Tenax accommodating tube 22 as much as possible. Referring specifically to fig. 3, it can be seen more intuitively from fig. 3 that, in order to better connect the support base 21 and the Tenax accommodating tube 22, a circular connecting plate with the same outer diameter as that of the support base 21 is welded to the upper end of the Tenax accommodating tube 22, and a layer of heat insulating material is bonded between the lower end of the support base 21 and the upper surface of the circular connecting plate, so as to reduce the heat conduction between the support base 21 and the Tenax accommodating tube 22.

The gas nozzle 3 is inserted into the hole, the upper end of the gas nozzle 3 is connected with a sampling gas or a gas pump, the support 21 is provided with two holes, one gas nozzle 3 is arranged in each hole, a sampling gas flow can enter from one gas nozzle 3, and the other gas nozzle 3 flows out;

the Tenax tube 4 is contained in the Tenax containing tube 22, and the upper end of the Tenax tube 4 is connected with the lower end of the air tap 3. The Tenax tube 4 is used for adsorbing VOC in the sampling gas flow, and the Tenax tube 4 has a better adsorption effect in a low temperature state, so that the Tenax tube 4 is expected to be kept in the low temperature state before adsorption and desorption.

The gas nozzle 3 may be an inlet through which the sampled gas enters the Tenax tube 4, or may be an inlet through which the gas adsorbed by the Tenax tube 4 is led out and connected to the gas pump.

In one embodiment, the heat insulation device further comprises a sealing heat insulation pad 5, the sealing heat insulation pad 5 is arranged between the support 21 and the opening, the heat insulation pad 5 comprises a two-layer structure, a lower rubber sealing ring layer and an upper heat insulation cotton layer are arranged on the lower layer, the rubber sealing ring layer and the heat insulation cotton layer are laminated together, the rubber sealing ring layer can be well attached to the edge of the opening, the rubber sealing ring layer does not have good heat conduction performance due to the fact that the rubber sealing ring layer is made of rubber materials, and in addition, the heat insulation cotton layer is further arranged on the rubber sealing ring layer to further isolate heat conduction between the support 21 and the cold chamber 1.

With reference to fig. 3 and 4, the number of said orifices provided on said seat 21 is two;

the Tenax accommodating tube 22 is a U-shaped Tenax accommodating tube, two tube openings of the U-shaped Tenax accommodating tube are respectively butted with the two apertures, the U-shaped Tenax accommodating tube comprises a first Tenax accommodating tube 221 and a second Tenax accommodating tube 222, and the first Tenax accommodating tube 221 and the second Tenax accommodating tube 222 respectively accommodate one Tenax tube 4.

In the embodiment shown in fig. 3 and 4, in order to save space better, two serially adsorbed Tenax tubes 4 are arranged side by side and adjacently, and the Tenax accommodating tube 22 is a U-shaped Tenax accommodating tube, the sampling gas flow passes through the first Tenax accommodating tube 221 and the second Tenax accommodating tube 222, the sampling gas flow passes through the serially adsorbed Tenax tubes 4 connected in series, and after double adsorption, VOC in the sampling gas (sampling gas flow) is more fully adsorbed by the Tenax tubes 4, so that the adsorption effect is further improved, and the sampling accuracy is improved.

Referring to fig. 4, the U-shaped Tenax accommodating tube 22 further includes a connecting seat 223, and the lower ends of the first Tenax accommodating tube 221 and the second Tenax accommodating tube 222 are communicated through the connecting seat 223. It should be noted that the air flow in the first Tenax accommodating tube 221 and the second Tenax accommodating tube 222 can form a serial air flow path only after the connecting seat 223 is matched. The lower ends of the first Tenax accommodating tube 221 and the second Tenax accommodating tube 222 are inserted into the upper end surface of the connecting seat 223.

Therefore, in order to clean the first Tenax accommodating tube 221 and the second Tenax accommodating tube 222 well, the first Tenax accommodating tube 221 and the second Tenax accommodating tube 222 can be cleaned completely after being separated from the connecting seat 223, and therefore the device has great significance for improving the accuracy of each test.

In addition, another object of providing the connection socket 223 is that the connection socket 223 can be smoothly fixed on the housing of the VOC sampling device, increasing the compactness and stability of the structure.

Referring to fig. 2, a peltier cooling unit 6 is disposed in the cold chamber 1, the peltier cooling unit 6 includes a peltier 61, a heat conducting fin 62 and a heat conducting fan 63, a cooling surface of the peltier 61 is disposed inside the cold chamber 1, the heat conducting fin 62 is connected to the cooling surface of the peltier 61, and the heat conducting fan 63 is disposed above the heat conducting fin 62. In this embodiment, the cold chamber 1 is kept at a low temperature by cooling in the peltier cooling unit 6, the heat conduction fin 62 functions to help conduct the low temperature of the side cooled by the peltier unit 61, and the heat conduction fan 63 radiates the low temperature on the heat conduction fin 62 to the entire space inside the cold chamber 1 by the air flow.

In one embodiment, referring to fig. 2, the apparatus further includes a control unit and a temperature sensing unit 7, the control unit is electrically connected to the peltier cooling unit 6 and the temperature sensing unit 7, respectively, a temperature probe of the temperature sensing unit 7 is disposed in the cold chamber 1, and is configured to detect temperature information in the cold chamber 1 and send the temperature information to the control unit, and the control unit adjusts the cooling power of the peltier cooling unit 6 according to the temperature information. As shown in fig. 2, the temperature probe of the temperature sensing unit 7 is disposed inside the cold chamber 1 and is used for detecting temperature information inside the cold chamber 1, and the temperature sensing unit 7 and the control unit are matched to realize feedback control of the temperature inside the cold chamber 1, so that the low temperature inside the cold chamber 1 can be stably maintained, and the Tenax tube 4 can be maintained at a high adsorption rate.

In one embodiment, referring to fig. 2, the outer wall of the air faucet 3 is provided with two first sealing ring grooves 31, a first sealing ring 32 is arranged in the first sealing ring groove 31, and when the air faucet 3 is inserted into the opening, the first sealing ring 32 is used for hermetically sealing the inside of the Tenax accommodating tube 22 from the external environment. In order to better identify the first seal ring groove 31, the position of the first seal ring 32 at the first seal ring groove 31, that is, the left part, is omitted, the first seal ring 32 only shows the right part, as shown in fig. 2, in order to ensure the sealing effect, the number of the first seal ring grooves 31 is two, the two first seal ring grooves 31 are arranged in an upper-lower structure, and each first seal ring groove 31 is provided with a first seal ring 32. Air cock 3 peg graft in during the drill way, first sealing washer 32 plays sealed effect, in addition, can also play and make air cock 3 firmly peg graft in the intraoral effect of drill way.

In one embodiment, referring to fig. 2, the main body of the air faucet 3 is tubular, and an inverted circular truncated cone structure is formed on the outer wall of the main body. Will the outer wall of the main part of air cock 3 establishes into radius platform structure, and its purpose is worked as air cock 3 peg graft in during the drill way, the structure of falling the round platform has both made air cock 3 closely peg graft in the drill way can prevent again air cock 3 excessively pegs graft into the drill way, need will in addition air cock 3 is followed during the extraction in the drill way, radius platform structure can be the atress better, makes air cock 3 easily follows the drill way is extracted.

In one embodiment, referring to fig. 2, the lower end of the air faucet 3 enters the inside of the upper end of the Tenax tube 4 to be connected, a second sealing ring groove (not shown) is arranged around the outer wall of the lower end of the air faucet 3, a second sealing ring (not shown) is arranged in the second sealing ring groove, the structure of the second sealing ring groove and the second sealing ring is similar to that of the first sealing ring groove and the first sealing ring, and the part of the lower end of the air faucet 3 entering the upper end of the Tenax tube 4 is hermetically connected with the inside of the upper end of the Tenax tube 4 through the second sealing ring. In this embodiment, the lower end of the air faucet 3 is connected to the upper end of the Tenax tube 4 in an airtight manner, and the air faucet 3 is connected to the Tenax tube 4 in an airtight manner by providing the second sealing ring groove at the lower end of the air faucet 3 and configuring a second sealing ring. In addition, the lower end of the air faucet 3 and the Tenax tube 4 can be connected in a sealing mode through a silica gel tube serving as an intermediate connecting piece.

In one embodiment, referring to fig. 4, the upper end of the connecting base 223 is provided with an interface slot 224 which is communicated with each other and is connected with the lower ends of the first Tenax accommodating tube 221 and the second Tenax accommodating tube 222, respectively, and the lower end of the connecting base 223 is fixed on a mounting plate. The lower ends of the first and second Tenax-containing tubes 221 and 222 communicate through the interface slot 224, and the mounting plate is a component on the housing of the device that is configured to fit the attachment socket 223.

The path through which the sample gas flows is described below in conjunction with fig. 4:

it should be noted that, as shown in fig. 4, for better distinction, the air tap into which the sampling air flow enters is denoted as air tap 3a, and the air tap out of which the sampling air flow exits is denoted as air tap 3 b; the Tenax tube, which will be located inside the first Tenax containment tube 221, is designated 4a, and the Tenax tube, which will be located inside the second Tenax containment tube 222, is designated 4 b.

The sampling air flow enters the air tap 3a from the upper end of the air tap 3a and enters the upper end of the Tenax tube 4a positioned in the first Tenax containing tube 221 from the lower end of the air tap 3a, and the sampling air flow is adsorbed for the first time in the Tenax tube 4a and comes out from the lower end of the Tenax tube 4 a;

into the interior space of the first Tenax containment tube 221;

sample gas flow continues from the mouthpiece slot 224 into the interior space of the second Tenax containment tube 222 due to the negative pressure of the sample pump;

the sampling gas flow enters the Tenax tube 4b from the lower end of the Tenax tube 4a from bottom to top, the sampling gas flow is adsorbed for the second time in the Tenax tube 4b, and the sampling gas flow enters the lower end of the air nozzle 3b from the upper end of the Tenax tube 4 b;

the sampling air flow enters the air nozzle 3b from the lower end of the air nozzle 3b and flows out from the upper end of the air nozzle 3 b.

Therefore, VOC contained in the sampling air flow is adsorbed by the Tenax tube 4a for the first time and adsorbed by the Tenax tube 4b for the second time, so that the adsorption of the VOC is more thorough, and the sampling data is more accurate.

It should be noted that the air tap 3a may be directly connected to the environment to be sampled, or may be connected to the air pipe, so that the air pipe extends to the environment to be sampled, and the air tap 3b is connected to the air pump.

It should be noted that the orientation of the Tenax tubes 4a and 4b needs to be correctly installed, and the orientation cannot be reversed.

It should be noted that, the first Tenax accommodating tube 221 and the second Tenax accommodating tube 222 are filled with sampling air flow, so that the air tightness of the device needs to be ensured, and in addition, the first Tenax accommodating tube 221 and the second Tenax accommodating tube 222 are filled with sampling air flow, so that the first Tenax accommodating tube 221 and the second Tenax accommodating tube 222 are both set to be tubular structures, and the device is easy to clean and beneficial to improving the accuracy of sampling data each time.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.

Claims (10)

1. A high efficiency low loss VOC sampling device comprising:

the cold cavity is a cavity body which can be used for providing a low-temperature environment, and the upper end of the cold cavity is provided with at least one opening;

a Tenax tube stent comprising: the support and the Tenax containing pipe connected to the lower end of the support penetrate through the upper end face and the lower end face of the support, orifices are formed in the upper end face and the lower end face of the support, the orifices penetrate through the Tenax containing pipe, the Tenax pipe support can be integrally or partially placed in the cold cavity, when the Tenax pipe support is partially placed in the cold cavity, the support is borne at the edge of the opening, and the Tenax containing pipe penetrates through the opening and is contained in the cold cavity.

The air faucet is inserted into the hole, and the upper end of the air faucet is connected with the sampling gas or the gas pump;

the Tenax tube is contained in the Tenax containing tube, and the upper end of the Tenax tube is connected with the lower end of the air tap.

2. The high efficiency low loss VOC sampling device according to claim 1, further comprising a thermal sealing pad disposed between the pedestal and the opening, the thermal sealing pad comprising a two-layer structure, a lower rubber gasket layer, an upper insulation cotton layer, and the rubber gasket layer and the insulation cotton layer being laminated together.

3. The high efficiency low loss VOC sampling device of claim 1,

the number of the orifices is two;

the Tenax containing pipe is a U-shaped Tenax containing pipe, two pipe openings of the U-shaped Tenax containing pipe are respectively butted with the two hole openings, the U-shaped Tenax containing pipe comprises a first Tenax containing pipe and a second Tenax containing pipe, and the first Tenax containing pipe and the second Tenax containing pipe respectively contain one Tenax pipe.

4. The high efficiency low loss VOC sampling device of claim 3, wherein the U-shaped Tenax containment tube further comprises a connection socket, the lower ends of the first Tenax containment tube and a second Tenax containment tube being in communication through the connection socket.

5. The high efficiency low loss VOC sampling device according to claim 1, wherein a peltier cooling unit is provided in said cold chamber, said peltier cooling unit comprising a peltier, a heat conducting fin and a heat conducting fan, said peltier cooling side being disposed inside said cold chamber, said heat conducting fin being connected to said peltier cooling side, said heat conducting fan being disposed above said heat conducting fin.

6. The high-efficiency low-loss VOC sampling device of claim 5 further comprising a control unit and a temperature sensing unit, wherein said control unit is electrically connected to said Peltier cooling unit and said temperature sensing unit, respectively, a temperature probe of said temperature sensing unit is disposed in said cold chamber and is used for detecting temperature information in said cold chamber and sending said temperature information to said control unit, and said control unit adjusts the cooling power of said Peltier cooling unit according to said temperature information.

7. A high efficiency low loss VOC sampling device according to claim 1, wherein the outer wall of the air cap is provided with at least a first sealing ring groove, and a first sealing ring is arranged in the first sealing ring groove, and when the air cap is inserted into the orifice, the first sealing ring is used to hermetically seal the inside of the Tenax containing tube with the external environment.

8. The high efficiency low loss VOC sampling device of claim 7, wherein the body of the air cap is tubular in configuration and an inverted frustum is formed on the outer wall of the body.

9. The high-efficiency low-loss VOC sampling device as claimed in any one of claims 1, 7 and 8, wherein the lower end of said air faucet enters and is connected with the inside of the upper end of said Tenax tube, a second sealing ring groove is arranged around the outer wall of the lower end of said air faucet, a second sealing ring is arranged in said second sealing ring groove, and the part of the lower end of said air faucet entering the upper end of said Tenax tube is connected with the inside of the upper end of said Tenax tube in a sealing way through said second sealing ring.

10. A high efficiency low loss VOC sampling device as claimed in claim 4 wherein said connecting base has an upper end provided with an interconnected port for connection to the lower ends of a first and a second Tenax containing tube, respectively, and a lower end fixed to a mounting plate.

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