CN115791358A

CN115791358A - VOCs trapping device

Info

Publication number: CN115791358A
Application number: CN202310067313.8A
Authority: CN
Inventors: 王澎蛟; 曾立民; 廖益斌; 刘录华; 张春超; 罗潇; 李树伟; 邵云雷
Original assignee: Beijing Pengyu Changya Environmental Protection Technology Co ltd
Current assignee: Beijing Pengyu Changya Environmental Protection Technology Co ltd
Priority date: 2023-02-06
Filing date: 2023-02-06
Publication date: 2023-03-14
Anticipated expiration: 2043-02-06
Also published as: CN115791358B

Abstract

The application relates to the field of environment check out test set, especially, relate to a VOCs entrapment device for carry out the entrapment to the VOCs in the entrapment pipeline, include: the refrigeration bin is a double-layer heat-insulation shell; the refrigerating device is connected with the interior of the refrigerating bin and is used for refrigerating the interior of the refrigerating bin; the VOCs pretreatment device is arranged at one end of the refrigerating device, which is positioned in the refrigerating bin, and is used for fixing the position of the trapping pipeline in the refrigerating bin; the heating device is arranged on the outer wall of the refrigerating bin and used for heating the collecting pipeline; and one end of the vacuumizing device is connected to the refrigerating bin and is used for vacuumizing the refrigerating bin. The device has the effects of reducing the generation of crystallization conditions around the VOCs pretreatment device, reducing the energy waste and improving the trapping quality.

Description

VOCs trapping device

Technical Field

The application relates to the field of environment detection equipment, in particular to a VOCs trapping device.

Background

In the field of environmental monitoring, enrichment and analysis of gaseous pollutants, particularly volatile organic compounds in the atmosphere, are mainly realized through a low-temperature adsorption-pyrolysis analysis process, the process comprises two steps, the first step is to reduce the temperature of a trap to be below-150 ℃, a trap component and a cold block are integrated together, the cold energy of the cold block can be sufficiently and quickly transmitted to the trap component, and after the refrigerating temperature is reached, VOCs in the trap component are converted from a gaseous state to a solid state and are adsorbed and collected; the second step is to raise the trap temperature to above 100 ℃, and the VOCs are completely thermally analyzed and enter a subsequent analysis system.

There are currently 4 main methods of achieving cryogenic capture of gaseous pollutants: semiconductor refrigeration, liquid nitrogen refrigeration, high-power compressor refrigerators and low-power thermoacoustic refrigerators. The low-power thermoacoustic refrigerator is widely applied due to the advantages of small volume, light weight, easy transportation and the like. But the power of the corresponding low-power thermoacoustic refrigerator is low, and the refrigerating temperature can reach below-150 ℃ but cannot be too high below-150 ℃. In the trapping process, due to the ultralow temperature at the position of the VOCs pretreatment device, ice crystals can be condensed around the VOCs pretreatment device, so that energy loss is caused, the temperature at the final trapping part cannot reach-150 ℃, and the situation of incomplete trapping is caused.

Disclosure of Invention

In order to reduce the production of the crystallization condition around the processing apparatus before the VOCs, reduce the waste of energy, improve the entrapment quality, this application provides a VOCs entrapment device.

The application provides a VOCs entrapment device adopts following technical scheme:

a device for trapping VOCs in a trapping pipeline, comprising:

the refrigerating bin is a double-layer heat-insulating shell;

the refrigerating device is connected with the interior of the refrigerating bin and is used for refrigerating the interior of the refrigerating bin;

the VOCs pretreatment device is arranged at one end of the refrigerating device, which is positioned in the refrigerating bin, and is used for fixing the position of the trapping pipeline in the refrigerating bin;

the heating device is arranged on the outer wall of the refrigerating bin and used for heating the collecting pipeline;

and one end of the vacuumizing device is connected to the refrigerating bin and is used for vacuumizing the refrigerating bin.

By adopting the technical scheme, when the VOCs are collected, the refrigeration bin is vacuumized by the vacuumizing device, and the heat transfer process can be divided into three types of gas heat transfer, liquid heat transfer and solid heat transfer according to the difference of heat transfer media in the heat transfer theory. The gas heat conduction is mainly completed by energy transfer when gas molecule thermal motion collides, and according to the gas molecule kinetic theory, when the temperature is unchanged, the heat conductivity of the gas is slightly changed along with the gas pressure under normal pressure; under the low-pressure condition that the air pressure is less than 2600pa, the gas density is reduced, the mean free path is increased, the probability of mutual collision among molecules is reduced, and the thermal conductivity is reduced along with the reduction of the pressure; absolute vacuum heat can only be transferred by thermal radiation. The main purpose of vacuumizing the interior of the refrigerating bin is to reduce the probability of intermolecular collision by approaching a vacuum environment, thereby blocking heat transfer and reducing the loss of cold energy during refrigeration of the refrigerator. The double-deck setting in storehouse of refrigerating simultaneously can further reduce the probability that the heat distributes away, reduces the production of the crystallization condition around the VOCs pretreatment device, has also reduced the waste of energy simultaneously. The trapping pipeline can be refrigerated through the refrigerating device until the trapping device is cooled to the temperature below-150 ℃, so that the VOCs are converted from a gas state into a liquid state and adsorbed on the inner wall of the trapping pipeline. And then heating the trapping pipeline through a heating device, so that the temperature of the trapping pipeline is raised to be higher than 100 ℃, and the VOCs on the wall of the trapping pipeline are thermally analyzed and then enter a subsequent analysis system through the trapping pipeline. The trapping of the VOCs is completed, and the loss of energy is greatly reduced in the trapping process, so that the trapping pipeline can be cooled to below-150 ℃, more VOCs can be trapped, and the trapping quality is greatly improved.

Optionally, the refrigeration compartment includes:

the refrigerator comprises a main shell, a refrigerating device and a control device, wherein one end of the main shell is open, and one end of the main shell, which is far away from the open end of the main shell, is provided with a mounting hole for the refrigerating device to penetrate;

the sealing cover is arranged at the opening end of the main shell and is used for installing a heating device;

the heat preservation cover is sleeved on the main shell, and a vacuum heat preservation cavity is formed between the main shell.

Through adopting above-mentioned technical scheme, VOCs pretreatment device etc. can install in the main casing through the open end of main casing body to seal the main casing body open end through sealed lid. The arrangement of the vacuum heat preservation cavity also enables the heat preservation effect of the refrigeration bin to be better, and the energy overflow is reduced.

Optionally, the heat preservation cover is established including the cover heat preservation shell and rigid coupling on the main casing body are in the closed ring of heat preservation shell inner wall, the closed ring is provided with two, two the closed ring is located respectively the both ends of heat preservation shell, every the closed ring with all install the heat preservation sealing washer between the heat preservation shell.

Through adopting above-mentioned technical scheme, the setting up of closed ring makes and forms the vacuum heat preservation chamber between heat preservation shell and the main casing body, and the setting up of heat preservation sealing washer can increase the sealed of heat preservation sealed chamber.

Optionally, the heat insulation cover is provided with a first vacuumizing joint for vacuumizing the vacuum heat insulation cavity, and one end of the first vacuumizing joint, which is located outside the vacuum heat insulation cavity, is connected with a vacuumizing device.

Through adopting above-mentioned technical scheme, through being connected first evacuation joint and evacuating device, can carry out the evacuation work to vacuum heat preservation chamber through evacuating device.

Optionally, the vacuum pumping device comprises a vacuum pump and an air pumping pipeline fixedly connected to an air inlet of the vacuum pump, and one end of the air pumping pipeline, which is far away from the vacuum pump, is connected with a first air pumping pipe connected with the first vacuum pumping joint and a second air pumping pipe connected with the refrigerating bin.

Through adopting above-mentioned technical scheme, can carry out evacuation work to vacuum heat preservation chamber and refrigeration storehouse inside simultaneously through the vacuum pump.

Optionally, install the second on the main casing body and take out vacuum joint, second take out vacuum joint one end be located main casing body outside with the second exhaust tube is connected, the second is taken out vacuum joint the other end and is located main casing body inside and be used for right main casing body evacuation operation.

Through adopting above-mentioned technical scheme, through connect the second exhaust tube on the second evacuation connects, can carry out the evacuation work to main casing body inside through the vacuum pump.

Optionally, the second vacuumizing joint is located one end of the main casing inside is fixedly connected with an oil filtering pipe, and the oil filtering pipe is spirally wound.

Through adopting above-mentioned technical scheme, can adsorb that the fluid that the vacuum pump evacuation in-process produced volatilizees, reduce volatilizing fluid and arrive in the refrigeration storehouse and cause the pollution to the refrigeration storehouse.

Optionally, heating device is including dismantling to be connected installation department on the refrigeration storehouse, can dismantle to be connected sealed cap on the installation department and installing heater strip on the installation department, sealed cap with place between the installation department and be used for fixing the trapping pipeline and be in the lock sleeve of position on the installation department works as sealed cap with when being connected between the installation department is inseparabler, the lock sleeve is tighter to the centre gripping of trapping pipeline.

Through adopting above-mentioned technical scheme, during the use, directly establish installation department, lock sleeve and sealed cap on the entrapment pipeline in proper order, then connect the installation department on the refrigeration storehouse to with sealed cap connection on the installation department, and along with sealed cap and the installation department between be connected tighter, the lock sleeve is tighter to the centre gripping of entrapment pipeline, thereby fix the relative position between installation department and the entrapment pipeline, and then fix the position between heater strip and the entrapment pipeline, the heater strip of being convenient for heats the entrapment pipeline.

Optionally, an opening has been seted up on the lock sleeve lateral wall, the tip of lock sleeve is the toper, the installation department orientation the one end of sealed cap and/or the sealed cap orientation the confession is seted up to the one end of installation department the locking groove of the conical tip embedding of lock sleeve.

Through adopting above-mentioned technical scheme, during the installation, establish the lock sleeve cover on the entrapment pipeline, sealed cap is connected with the installation department in order to live the lock sleeve centre gripping, and when the centre gripping was tighter between sealed cap and the installation department, when will promote the conical tip of lock sleeve and insert the locking inslot, along with the lock sleeve is insertive tighter, the lock sleeve is tighter to the fixed of entrapment pipeline.

Optionally, the installation department is including dismantling to be connected solid fixed cylinder and threaded connection on the refrigeration storehouse solid fixed cylinder is kept away from the installation section of thick bamboo of refrigeration storehouse one end, gu the fixed cylinder with place between the installation section of thick bamboo and compress tightly the sealing washer, it is right to compress tightly the sealing washer be used for seal between solid fixed cylinder and the entrapment pipeline.

Through adopting above-mentioned technical scheme, can realize sealed between solid fixed cylinder and the entrapment pipeline through compressing tightly the sealing washer, reduce the probability that the energy in the refrigeration storehouse spilled over from between solid fixed cylinder and the entrapment pipeline.

In summary, the present application includes at least one of the following beneficial technical effects:

1. according to the application, the refrigeration bin is a double-layer heat-insulation shell, and the vacuumizing device is arranged to vacuumize the refrigeration bin, so that the gas transmission speed in the vacuum bin can be reduced, the probability of energy overflowing out of the vacuum bin is reduced, the trapping component at the pretreatment device can be reduced to be below 150 ℃ below zero, the generation of crystallization conditions around the VOCs pretreatment device is reduced to the maximum extent, the energy waste is reduced, and the trapping quality is improved;

2. the oil filter pipe is spirally arranged, so that in the working process of the vacuum pump, if volatile oil reaches the refrigerating bin along the second exhaust pipe and then reaches the oil filter pipe, the volatile oil is condensed and adsorbed on the oil filter pipe due to the low temperature of the vacuum bin, and the formation of the volatile oil reaching the refrigerating bin is increased by the spiral oil filter pipe, so that the volatile oil can be fully condensed in the oil filter pipe;

3. this application is through will refrigerate in the refrigeration storehouse to heat the entrapment pipeline outside the refrigeration storehouse, make when the realization can carry out cooling and heating to the entrapment pipeline respectively, still can not make cooling and heating conflict mutually.

Drawings

Fig. 1 is a schematic view of the overall structure of the present application when the vacuum extractor is not installed.

Fig. 2 is a schematic front view of the structure of fig. 1.

Fig. 3 is a schematic structural view of another cross-section of fig. 2.

Fig. 4 is a sectional view schematically showing the internal structure of the heating apparatus.

Fig. 5 is an exploded schematic view of the heating device of the present application.

Description of reference numerals: 1. a refrigeration bin; 11. a main housing; 12. a sealing cover; 121. an end cap seal ring; 13. a heat-preserving cover; 131. a heat preservation shell; 132. a closed loop; 133. a first evacuation connection; 134. a heat preservation sealing ring; 14. a vacuum heat preservation cavity; 15. a second evacuation connection; 16. an oil filter pipe; 2. VOCs pretreatment device; 3. a heating device; 31. an installation part; 311. a fixed cylinder; 312. mounting the cylinder; 313. compressing the sealing ring; 314. a compaction groove; 32. a sealing cap; 33. a locking sleeve; 331. a notch; 34. heating wires; 35. a locking groove; 36. installing a bolt; 4. a refrigeration device; 5. a vacuum pumping device; 51. a vacuum pump; 52. an air exhaust pipeline; 53. a first exhaust tube; 54. a second extraction tube; 55. a control valve; 6. a collection conduit.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses VOCs entrapment device. Referring to fig. 1 and 2, the device for trapping VOCs includes a refrigerating chamber 1, a device for pretreating VOCs 2 installed in the refrigerating chamber 1 to support and fix a trapping pipe 6, a heating device 3 for heating the trapping pipe 6, and a refrigerating device 4 for refrigerating the trapping pipe 6. The system comprises a refrigeration bin 1, a refrigeration device 4, a collecting pipeline 6 and a VOCs pretreatment device 2, wherein the refrigeration bin 1 is a double-layer heat-insulation shell, one end of the refrigeration device 4 is positioned in the refrigeration bin 1 and is in contact with the collecting pipeline 6 through the VOCs pretreatment device 2, and the refrigeration device is used for cooling the collecting pipeline 6; the heating device 3 can be mounted on the outer wall of the refrigeration silo 1 and connected with the collecting pipeline 6 for heating the collecting pipeline 6. Meanwhile, a vacuumizing device 5 for vacuumizing the refrigerating bin 1 is further arranged, and the interior of the refrigerating bin 1 can be vacuumized through the vacuumizing device 5.

In the theory of heat conduction, the heat transfer process can be divided into three types, namely gas heat transfer, liquid heat transfer and solid heat transfer according to different heat transfer media, and the solid heat transfer is divided into metal heat transfer and nonmetal heat transfer. The three heat conduction modes have different microscopic mechanisms, wherein the gas heat conduction is mainly completed through energy transfer when gas molecules collide during thermal movement, and according to the gas molecular dynamics theory, when the temperature is not changed, the heat conductivity of the gas is slightly changed along with the gas pressure under normal pressure; under the low-pressure condition that the air pressure is less than 2600pa, the gas density is reduced, the mean free path is increased, the probability of mutual collision among molecules is reduced, and the thermal conductivity is reduced along with the reduction of the pressure; absolute vacuum heat can only be transferred by thermal radiation. The main purpose of the refrigerating chamber 1 is to reduce the probability of collision between molecules by approaching to a vacuum environment, thereby blocking heat transfer and reducing the loss of cold energy when the refrigerating device 4 refrigerates.

Referring to fig. 1 and 2, the refrigeration compartment 1 includes a box-shaped main housing 11 with an open end, a sealing cover 12 detachably connected to the open end of the main housing 11 by bolts, and a heat insulating cover 13 covering the main housing 11. An end cover sealing ring 121 is installed between the main casing 11 and the sealing cover 12, so as to seal the inside of the refrigerating compartment 1.

The main housing 11 is cylindrical, and the cylindrical main housing 11 has better supporting performance, so that the probability of deformation of the main housing 11 when the inside of the main housing 11 is vacuumized can be reduced. The refrigerating device 4 can be an existing refrigerator, a refrigerator main body is positioned outside the main shell 11, and a refrigerating end of the refrigerator penetrates through the closed end of the main shell 11 and extends into the main shell 11; the pretreatment device 2 for VOCs is fixedly connected with the refrigerating end of the refrigerant, the pretreatment device 2 for VOCs can select the existing pretreatment device 2 for VOCs, and the specific structure of the pretreatment device 2 for VOCs is not explained.

The collecting pipeline 6 is integrally U-shaped, two ends of the U-shape penetrate out of the sealing cover 12, and the bottom of the U-shape is fixedly connected to the VOCs pretreatment device 2 so as to refrigerate the collecting pipeline 6 through the refrigerating device 4.

The heating device 3 is mounted on the sealing cover 12 on the side of the sealing cover 12 facing away from the interior of the main housing 11.

When the device is used, the trapping pipeline 6 is directly installed in the refrigerating bin 1, and the trapping pipeline 6 is fixed at the position in the refrigerating bin 1 through the VOCs pretreatment device 2. The capture pipeline 6 can be cooled by the refrigerating device 4, and because the interior of the refrigerating bin 1 is in a near vacuum environment and the probability of intermolecular collision is low, the probability of energy loss caused by the emission of cold air at the refrigerating device 4 and the capture pipeline 6 to the outside is reduced; and the arrangement of the heat preservation cover 13 ensures that the energy reaching the inner wall of the main shell 11 is also isolated by the heat preservation cover 13, thereby reducing the energy overflow at the main shell 11 and further reducing the energy loss probability.

The heat-insulating cover 13 includes a heat-insulating shell 131 sleeved on the main housing 11 and two closed rings 132 fixedly connected to the inner wall of the heat-insulating shell 131, and the two closed rings 132 are respectively located at two ends of the heat-insulating shell 131, so that a vacuum heat-insulating cavity 14 is formed between the heat-insulating shell 131, the main housing 11 and the two closed rings 132.

Meanwhile, a first vacuumizing joint 133 for vacuumizing the vacuum heat preservation cavity 14 is fixedly connected to the heat preservation shell 131, one end of the first vacuumizing joint 133 is located in the vacuum heat preservation cavity 14 and communicated with the vacuum heat preservation cavity 14, and the other end of the first vacuumizing joint 133 is located outside the vacuum heat preservation cavity 14 and used for being connected with the vacuumizing device 5.

Meanwhile, a heat-insulating sealing ring 134 is installed between each sealing ring 132 and the main housing 11, so that the vacuum heat-insulating cavity 14 can be sealed.

Referring to fig. 3, the vacuum pumping device 5 includes a vacuum pump 51, an air exhaust duct 52 fixed at an air inlet of the vacuum pump 51, a first air exhaust pipe 53 fixed at an end of the air exhaust duct 52 far away from the vacuum pump 51 and communicated with the air exhaust duct 52, and a second air exhaust pipe 54 fixed at an end of the air exhaust duct 52 far away from the vacuum pump 51 and communicated with the air exhaust duct 52. The air extraction pipeline 52, the first air extraction pipe 53 and the second air extraction pipe 54 are connected through a three-way interface, and the first air extraction pipe 53 and the second air extraction pipe 54 are respectively connected with the vacuum heat preservation cavity 14 and the refrigeration bin 1 and are used for performing vacuum-extraction operation on the vacuum heat preservation cavity 14 and the refrigeration bin 1.

Meanwhile, in order to avoid that the external air reaches the vacuum heat preservation chamber 14 and the refrigerating chamber 1 from the air extraction pipe 52 when the vacuum pump 51 does not work and affects the vacuum degree of the vacuum heat preservation chamber 14 and the refrigerating chamber 1, a control valve 55 for controlling the on-off of the air extraction pipe 52 is installed on the air extraction pipe 52.

Referring to the figure, one end of the first pumping pipe 53 away from the pumping duct 52 is fixedly connected to the first vacuum joint 133 to perform the vacuum pumping operation on the vacuum insulation chamber 14.

Meanwhile, a second vacuum joint 15 is fixedly connected to the main housing 11, one end of the second vacuum joint 15 is located inside the main housing 11 and is communicated with the inside of the main housing 11, and the other end of the second vacuum joint 15 is located outside the main housing 11 and is fixedly connected to a second suction pipe 54. When the vacuum pump 51 is started, the vacuum pump 51 can directly vacuumize the interior of the heat-insulating vacuum chamber 14 and the refrigerating compartment 1.

The vacuum pump 51 of this application can select for use the diffusion pump, and the diffusion pump is with oil or mercury vapor as working medium, so can volatilize to the inside pollution that causes refrigeration storehouse 1 in order to reduce vacuum pump 51 during operation.

Therefore, an oil filter pipe 16 is fixedly connected to one end of the second vacuum-pumping joint 15, which is located inside the refrigerating bin 1, and the oil filter pipe 16 is integrally spirally coiled, so that the length of the oil filter pipe 16 can be ensured while a small space is occupied. When the oil vapor volatilized in the vacuum pump 51 reaches the refrigerating compartment 1, it first reaches the oil filter pipe 16 and flows along the length of the oil filter pipe 16. Due to the lower temperature inside the refrigeration compartment 1, the steam arriving in the oil filter tube 16 will condense on the inside of the oil filter tube 16, reducing the probability that the steam will arrive at the refrigeration compartment 1 and cause contamination of the refrigeration compartment 1.

Referring to fig. 4, the heating device 3 includes an installation part 31 screwed to one side of the sealing cover 12 far from the main casing 11, a sealing cap 32 screwed to one end of the installation part 31 far from the sealing cover 12, a locking sleeve 33 placed between the installation part 31 and the sealing cap 32, and a heating wire 34 detachably connected to the installation part 31, and the collecting pipeline 6 sequentially penetrates through the sealing cap 32, the locking sleeve 33, and the installation part 31 and then extends into the refrigerating chamber 1 from the sealing cover 12.

Referring to fig. 4 and 5, a notch 331 is formed in the side wall of the locking sleeve 33 along the length direction thereof, the notch 331 is formed from one end of the locking sleeve 33 to the other end, both ends of the locking sleeve 33 are tapered, and a locking groove 35 for inserting the tapered end of the locking sleeve 33 is formed in both the end of the mounting portion 31 facing the sealing cap 32 and the end of the sealing cap 32 facing the mounting portion 31. During installation, after the installation part 31, the locking sleeve 33 and the sealing cap 32 are sequentially sleeved on the collecting pipeline 6, the installation part 31 is screwed in a threaded hole formed in the sealing cover 12, the sealing cap 32 is screwed on the installation part 31, and the distance of the conical end part of the locking sleeve 33 inserted into the locking groove 35 is increased along with the tightening of the screwing of the sealing cap 32, so that the two sides of the notch 331 on the side wall of the locking sleeve 33 are relatively close to each other, and the collecting pipeline 6 is clamped by the locking cap.

Of course, one end of the locking sleeve 33 may be tapered, and in this case, the locking sleeve 33 will be opened at the end of the mounting portion 31 facing the sealing cap 32 or at the end of the sealing cap 32 facing the mounting portion 31. In the present application, the case where both ends of the locking sleeve 33 are tapered is taken as an example for explanation, and the locking groove 35 is provided in both the mounting portion 31 and the sealing cap 32.

Referring to fig. 4 and 5, the mounting portion 31 includes a fixed cylinder 311 screwed to the sealing cover 12 and a mounting cylinder 312 screwed to an end of the fixed cylinder 311 away from the sealing cover 12, the sealing cap 32 is connected to an end of the mounting portion 31 away from the fixed cylinder 311, and a compression seal ring 313 is disposed between the fixed cylinder 311 and the mounting cylinder 312, the compression seal ring 313 being used to seal between the fixed cylinder 311 and the trap pipe 6.

The two ends of the compression seal ring 313 are also designed to be conical, and the end parts of the fixed cylinder 311 and the mounting cylinder 312 are provided with compression grooves 314 for the conical ends of the compression seal ring 313 to be embedded, so that when the fixed cylinder 311 and the mounting cylinder 312 are screwed together, the compression seal ring 313 can be clamped, and the compression seal ring 313 is squeezed more tightly along with the tightening of the screwing between the fixed cylinder 311 and the mounting cylinder 312, and the sealing between the fixed cylinder 311 and the collecting pipeline 6 is tighter.

The heating wire 34 is installed on the installation cylinder 312, specifically, the installation bolt 36 is connected to the outer wall of the installation cylinder 312 in a threaded manner, the heating wire 34 is fixed on the outer wall of the installation cylinder 312 through the installation bolt 36, so that the heat of the heating wire 34 is transferred to the collecting pipeline 6 through the installation cylinder 312, and the collecting pipeline 6 is heated.

The implementation principle of the VOCs trapping device in the embodiment of the application is as follows: before use, the vacuum heat preservation cavity 14 and the refrigeration cabin 1 are vacuumized by the vacuum pump 51, so that the interior of the refrigeration cabin 1 and the vacuum heat preservation cavity 14 is processed to be close to a vacuum state. When VOCs are required to be trapped, and VOCs reach the VOCs pretreatment device 2 from the trapping pipeline 6, the refrigerating machine cools the trapping pipeline 6, energy at the refrigerating head of the refrigerating machine can be transmitted to the trapping pipeline 6 to the maximum extent, energy loss caused by air transmission can be avoided, and the temperature of the trapping pipeline 6 is guaranteed to be reduced to-150 ℃. At this time, the VOCs in the trapping pipeline 6 is condensed into a solid state from a gas state and is adsorbed, and after the adsorption is completed. The refrigerator is turned off, and the trapping pipeline 6 is heated by the heating wire 34, so that the solid-state VOCs enter a subsequent analysis system through the trapping pipeline 6 after being thermally resolved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A device for trapping VOCs in a trapping conduit (6), comprising:

the refrigeration system comprises a refrigeration bin (1), wherein the refrigeration bin (1) is a double-layer heat-insulation shell;

the refrigerating device (4) is connected with the inside of the refrigerating bin (1) and is used for refrigerating the inside of the refrigerating bin (1);

the VOCs pretreatment device (2) is arranged at one end of the refrigerating device (4) positioned in the refrigerating bin (1) and is used for fixing the position of the trapping pipeline (6) in the refrigerating bin (1);

the heating device (3) is arranged on the outer wall of the refrigerating bin (1) and is used for heating the trapping pipeline (6);

and one end of the vacuumizing device (5) is connected to the refrigerating bin (1) and is used for vacuumizing the refrigerating bin (1).

2. A VOCs capture device as claimed in claim 1 wherein the refrigeration chamber (1) comprises:

the refrigerator comprises a main shell (11), wherein one end of the main shell (11) is open, and a mounting opening for a refrigerating device (4) to penetrate through is formed in one end of the main shell (11) deviating from the open end;

a sealing cover (12) which is arranged at the opening end of the main shell (11) and is used for installing a heating device (3);

the heat preservation cover (13) is sleeved on the main shell (11) and a vacuum heat preservation cavity (14) is formed between the main shell (11).

3. The VOCs trapping device according to claim 2, wherein the heat-insulating cover (13) comprises a heat-insulating shell (131) sleeved on the main shell (11) and two sealing rings (132) fixedly connected to the inner wall of the heat-insulating shell (131), the two sealing rings (132) are respectively located at two ends of the heat-insulating shell (131), and a heat-insulating sealing ring (134) is installed between each sealing ring (132) and the heat-insulating shell (131).

4. A device for trapping VOCs as claimed in claim 2, wherein said thermal insulation cover (13) is provided with a first vacuum connector (133) for evacuating said vacuum thermal insulation chamber (14), and an end of said first vacuum connector (133) located outside said vacuum thermal insulation chamber (14) is connected to a vacuum unit (5).

5. A VOCs trapping device according to claim 4, characterized in that the vacuum pumping device (5) comprises a vacuum pump (51) and an air pumping pipeline (52) fixedly connected to an air inlet of the vacuum pump (51), and a first air pumping pipe (53) connected to the first vacuum pumping joint (133) and a second air pumping pipe (54) connected to the refrigerating bin (1) are connected to one end of the air pumping pipeline (52) far away from the vacuum pump (51).

6. A VOCs trapping device according to claim 5, wherein the main housing (11) is provided with a second evacuation connection (15), one end of the second evacuation connection (15) is located outside the main housing (11) and connected to the second evacuation pipe (54), and the other end of the second evacuation connection (15) is located inside the main housing (11) and used for evacuating the main housing (11).

7. A VOCs trapping device according to claim 6, characterized in that an oil filter pipe (16) is fixed to the end of the second vacuum connection (15) inside the main housing (11), the oil filter pipe (16) being wound in a spiral shape.

8. A VOCs trapping device according to claim 1, wherein the heating device (3) comprises a mounting portion (31) detachably connected to the cooling compartment (1) and a sealing cap (32) detachably connected to the mounting portion (31), a locking sleeve (33) for fixing the trapping pipe (6) at a position on the mounting portion (31) is placed between the sealing cap (32) and the mounting portion (31), and when the connection between the sealing cap (32) and the mounting portion (31) is tighter, the locking sleeve (33) is tighter to the trapping pipe (6).

9. A VOCs trapping device according to claim 8, wherein the locking sleeve (33) has an opening in a side wall thereof, the locking sleeve (33) has a tapered end, and the mounting portion (31) has a locking groove (35) for the tapered end of the locking sleeve (33) to be inserted into at one end of the sealing cap (32) and/or at one end of the sealing cap (32) facing the mounting portion (31).

10. A VOCs capture device as claimed in claim 9 wherein the mounting portion (31) comprises a mounting cylinder (311) releasably attached to the refrigeration chamber (1) and a mounting cylinder (312) threadably attached to an end of the mounting cylinder (311) remote from the refrigeration chamber (1), a compression seal ring (313) is disposed between the mounting cylinder (312) and the mounting cylinder (311), the compression seal ring (313) being adapted to seal between the mounting cylinder (311) and the capture duct (6).