CN113740123B

CN113740123B - Hand-held gas sampling device

Info

Publication number: CN113740123B
Application number: CN202010482295.6A
Authority: CN
Inventors: 张清军; 李元景; 陈志强; 李荐民; 朱伟平; 王巍; 王惺; 曹彪; 李鸽
Original assignee: Tsinghua University; Nuctech Co Ltd
Current assignee: Tsinghua University; Nuctech Co Ltd
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2022-10-18
Anticipated expiration: 2040-05-29
Also published as: CN113740123A

Abstract

There is provided a hand-held gas sampling device comprising: a housing; a sampling head extending from a first end of the housing; the filling pipe is arranged in the shell, the first end of the filling pipe is communicated with the sampling head in a fluid mode, and an adsorbing material suitable for adsorbing sampling gas is arranged in the filling pipe; a retention mechanism adapted to removably retain the filler tube within the housing; and a sampling pump in fluid communication with the second end of the fill tube through the retention mechanism, the sampling pump configured to draw a sampling gas into the fill tube through a sampling head. And (3) communicating the filling pipe 3 filled with the sampling gas to be detected with a gas detector, so as to detect whether a certain gas exists in the sampling gas and the content of the certain gas. This gaseous sampling device of hand-held type sample is convenient, and the gaseous easy storage of sampling, carry have improved sampling efficiency and detecting instrument's environmental suitability.

Description

Hand-held gas sampling device

Technical Field

Embodiments of the present disclosure relate to a detection system suitable for detecting a specific gas, and more particularly, to a hand-held gas sampling device suitable for use with a gas detection device.

Background

In the prior art, a gas sampling instrument is a conventional instrument for collecting gas samples in an atmospheric environment or an operating environment, and comprises a suction pump and a gas storage container (such as a gas storage tank or a gas storage bag), so that the gas sampling instrument can collect gas samples or collect balanced samples, and the sampling operation is rapid and reliable. However, the existing gas sampling equipment is large in size, complex in structure and difficult to carry and apply conveniently. Especially where large sampling devices cannot be used in certain environments, the use of gas samplers is limited. Therefore, there is a need to develop a portable gas sampling apparatus.

There have been developed handheld gas sampling devices that store sampled gas in a sampling device and then move the sampling device to an analysis device for gas analysis. In some cases, the sampling site is located a long distance from the gas analysis equipment, and thus leakage is likely to occur during transportation to affect the gas collection effect. Once some unnecessary gases are doped, the interference of gas analysis data can be seriously caused, and the detection effect is influenced. In addition, in the field of trace detection with higher detection requirements, the traditional sampling technology cannot enrich the sample.

Disclosure of Invention

An object of the present disclosure is to solve at least one aspect of the above problems and disadvantages in the related art.

According to an embodiment of an aspect of the present disclosure, there is provided a handheld gas sampling device comprising: a housing; a sampling head extending from the housing; the filling pipe is arranged in the shell, the first end of the filling pipe is communicated with the sampling head in a fluid mode, and an adsorbing material suitable for adsorbing sampling gas is arranged in the filling pipe; a retention mechanism adapted to removably retain the filler tube within the housing; and a sampling pump in fluid communication with the second end of the fill tube through the retention mechanism, the sampling pump configured to draw a sampling gas into the fill tube through a sampling head.

According to an embodiment of the disclosure, the retention mechanism has a retention state adapted to retain the filler tube in the housing and a release state allowing the filler tube to be removed from the housing.

According to an embodiment of the disclosure, a mouthpiece is provided on the housing, the sampling head is mounted on the outside of the mouthpiece from outside the housing, the first end of the filler tube is integrated with the inside of the mouthpiece, and the holding mechanism abuts against the second end of the filler tube in the held state.

According to an embodiment of the present disclosure, the holding mechanism includes: an accommodating part formed in the case and including a blocking wall having a through hole; a cylinder movably mounted in the accommodating part in the axial direction of the filler pipe, wherein a transmission hole penetrating in the axial direction is formed in the cylinder, a first end of the cylinder abuts against a second end of the filler pipe in a holding state of a holding mechanism, and the second end of the cylinder can move through the through hole of the blocking wall and is communicated with the sampling pump through a hose, so that the sampling head is communicated with the sampling pump; and an operating portion mounted on the cylinder and protruding the housing in a radial direction, the cylinder being driven to move in the axial direction by operating the operating portion.

According to an embodiment of the present disclosure, the holding mechanism further comprises an elastic return mechanism, the barrel being movable in a direction away from the filler tube against an elastic force of the elastic return mechanism.

According to an embodiment of the present disclosure, the cartridge comprises: a first portion; and a second portion having a diameter that is directly smaller than the diameter of the first portion. The elastic reset mechanism comprises a spring, and the spring is sleeved on the second part and is positioned between a step part between the first part and the second part and the blocking wall.

According to an embodiment of the present disclosure, the holding mechanism further comprises a first elastic ring disposed at the first end of the cylinder, and the second end of the filler pipe abuts against the first elastic ring and is communicated with the delivery hole of the cylinder.

According to an embodiment of the present disclosure, the retention mechanism further comprises an end cap configured to retain the first resilient ring at the first end of the barrel, the second end of the filler tube abutting the first resilient ring through the end cap.

According to an embodiment of the present disclosure, a first filter screen is disposed between the first end of the cylinder and the first elastic ring.

According to an embodiment of the present disclosure, a slot is provided on the housing, and the operating portion protrudes to an outside of the housing through the slot.

According to an embodiment of the present disclosure, a side portion of the slot close to one end of the blocking wall is provided with a first locking groove extending perpendicular to the axial direction, and the holding mechanism is held in a state of releasing the stuffing tube by being movable into the first locking groove by operating the operating portion.

According to an embodiment of the present disclosure, a side portion of the slot at an end remote from the blocking wall is provided with a second locking groove extending perpendicular to the axial direction, and the holding mechanism is held in a state of pressing the filler pipe by being movable into the second locking groove by operating the operating portion.

According to an embodiment of the present disclosure, the receiving portion is further provided with a positioning portion opposite to the blocking wall, the positioning portion being configured to prevent the cartridge from moving further toward the filler pipe.

According to one embodiment of the present disclosure, one of the interface and sampling head includes a plug, the other of the interface and sampling head includes a socket that receives the plug, and the sampling head communicates with the first end of the filler tube through the combination of the plug and the socket.

According to an embodiment of the disclosure, a second elastic ring is provided between the plug and the bottom of the socket, and the first end of the filler pipe abuts against the inner side of the second elastic ring.

According to an embodiment of the disclosure, a second filter is provided between the end of the plug and the second resilient ring.

According to an embodiment of the present disclosure, the housing includes: the interface is arranged at the first end of the mounting part, and the filler pipe is mounted in the mounting part; a body portion, a second end of the mounting portion being connected to a first side of the body portion, at least a portion of the retention mechanism and the sampling pump being mounted in the body portion; and a hand-held portion mounted on a second side of the main body portion opposite to the first side.

According to an embodiment of the present disclosure, an operation panel is provided on one side surface of the main body portion between the first side and the second side.

According to an embodiment of the present disclosure, the operation panel is provided with a speed regulation switch adapted to control the sampling speed of the sampling pump, and a display screen adapted to display the operating state of the handheld gas sampling device.

According to one embodiment of the present disclosure, a power supply or a power supply interface is provided in the handheld portion.

Drawings

FIG. 1 illustrates a top view of a handheld gas sampling assembly in accordance with an exemplary embodiment;

FIG. 2 illustrates an axial cross-sectional view in one direction of the handheld gas sampling assembly of FIG. 1;

FIG. 3 illustrates an axial cross-sectional view of the handheld gas sampling assembly of FIG. 1 in another direction perpendicular to the cross-sectional view of FIG. 2;

FIG. 4 is an enlarged schematic view of portion A of FIG. 2 with the retaining mechanism in a retaining state;

FIG. 5 shows another enlarged schematic view of section A of FIG. 2 with the retaining mechanism in a released state;

FIG. 6 shows an enlarged schematic view of portion B of FIG. 3; and

fig. 7 illustrates a top view of a slot suitable for operating an operating portion according to an exemplary embodiment of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be described clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the embodiments described are only some embodiments of the present disclosure, rather than all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without any inventive step, are intended to be within the scope of the present disclosure.

In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in diagram form to simplify the drawing. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In the description of the present disclosure, it should be understood that the terms "first", "second", etc. are used to define the components, and are used only for convenience of distinguishing the corresponding components, and if not otherwise stated, the terms have no special meaning, and thus, should not be construed as limiting the scope of the present disclosure.

According to a general inventive concept of the present disclosure, there is provided a handheld gas sampling device, comprising: a housing; a sampling head extending from a first end of the housing; the filling pipe is arranged in the shell, the first end of the filling pipe is communicated with the sampling head in a fluid mode, and an adsorbing material suitable for adsorbing sampling gas is arranged in the filling pipe; a retention mechanism adapted to removably retain the filler tube within the housing; and a sampling pump in fluid communication with the second end of the fill tube through the retention mechanism, the sampling pump configured to draw a sampling gas into the fill tube through a sampling head.

FIG. 1 illustrates a top view of a handheld gas sampling assembly in accordance with an exemplary embodiment; FIG. 2 illustrates an axial cross-sectional view in one direction of the handheld gas sampling assembly shown in FIG. 1.

As shown in fig. 1-2, a handheld gas sampling device 100 according to an exemplary embodiment of the present disclosure includes: a housing 1; a sampling head 2 projecting from a first end (upper end in fig. 1 and 2) of the housing 1; a filler tube 3 mounted in the housing 1, a first end (upper end in fig. 1 and 2) 32 of the filler tube 3 being in fluid communication with the sampling head 2, an adsorbing material 31 adapted to adsorb a sampling gas being provided in the filler tube 3; a retaining mechanism 4 adapted to removably retain the filler tube 3 within the housing; and a sampling pump 5 in fluid communication with a second end (lower end in fig. 1 and 2, right end in fig. 5) 33 of the filler tube 3 through the holding mechanism 4, the sampling pump 5 being configured to draw a sample gas to be measured into the filler tube 3 through the sampling head 2.

The adsorbent material 31 filled in the filler tube 3 includes at least one of adsorbent materials having a sampling gas enrichment capacity, such as carbon molecular sieve (TDX-01), graphitized carbon black (STH-2), and Tenax-TA/GC/GR. The sample gas to be measured, which is drawn into the filler pipe 3 through the sampling head 2 by the sampling pump 5, is adsorbed in the adsorbing material, and is thus stored in the filler pipe 3. The length of the filler tube included a 3.5 inch or 7 inch standard pyrolysis straw.

The sampling head 2 can be made of different materials and shapes according to the condition of the sampled gas to be detected, wherein the sampling head 2 is made of an internally polished 316 stainless steel tube material by taking sampling gas for luggage and containers as an example. Therefore, the sampling head 2 can be conveniently inserted into the zipper seam/container door seam of the detected bag for sampling or sampling in the atmosphere, and the inner wall can be polished to reduce the sample residue.

In an exemplary embodiment, the retention mechanism 4 has a retention state adapted to retain the filler tube 3 in the housing 1 and a release state allowing the filler tube 3 to be removed from the housing 1. In the case where the filler tube 3 is not placed in the housing 1, the holding mechanism 4 may be operated such that the holding mechanism 4 is in a released state, after which the filler tube is placed in the housing 1; and operating the holding mechanism 4 so that the holding mechanism 4 is in a holding state, thereby firmly fixing the filler tube 3 in the housing 1 and communicating with the sampling head 2 and the sampling pump 5; aligning the sampling head 2 to an article to be detected, and starting a sampling pump 5 to sample for a preset time; thereafter, the holding mechanism 4 is operated so that the holding mechanism 4 is in a released state to take out the filler tube 3 filled with the sample gas to be measured from the housing 1. And (3) communicating the filling pipe 3 filled with the sampling gas to be detected with a gas detector, so as to detect whether a certain gas exists in the sampling gas and the content of the certain gas.

By combining the handheld gas sampling device with the gas detector, the handheld gas sampling device can measure the content and the content of Volatile Organic Compounds (VOCs), toxic and harmful gases, fumigant, high-combustible gases, trace drugs, explosives and other gases in a certain occasion or in a container or a trunk.

In one embodiment, the gas detector may comprise an Ion Mobility Spectrometer (IMS), such as an Ion Mobility tube that may be dual mode, such as a monolithic ceramic dual mode tube. The ion mobility spectrometer may also be a positive or negative single mode ion mobility tube.

FIG. 3 illustrates an axial cross-sectional view of the handheld gas sampling assembly of FIG. 1 in another direction perpendicular to the cross-sectional view of FIG. 2; FIG. 4 is an enlarged schematic view of portion A of FIG. 2 with the retaining mechanism in the retaining state; FIG. 5 is another enlarged schematic view of portion A of FIG. 2, with the retaining mechanism in a released state; fig. 6 shows an enlarged schematic view of portion B of fig. 3.

In an exemplary embodiment, as shown in fig. 1-6, a port 11 is provided on the housing 1, the sampling head 2 is mounted on the outside of the port 11 from the outside of the housing 1, and the first end of the filler tube 3 is combined with the inside of the port 11. The retaining mechanism 4 abuts the second end 33 of the filler tube 3 in the retained state to ensure that the filler tube 3 is in sealing engagement with the sampling head 2 and the sampling pump 4 and to prevent the filler tube 3 from being detached from the housing 1. The holding means 4 is in a released state separated from the second end 33 of the filler tube 3 so that the filler tube 3 can be removed from the housing 1.

In an exemplary embodiment, as shown in fig. 1-5, the retention mechanism 4 includes a receiving portion 41, a barrel 42, and an operating portion 43. The receiving portion 41 is formed in the housing 1 and includes a blocking wall 411 having a through hole. A cylinder 42 is movably mounted in the accommodating portion 41 in the axial direction of the filler tube 3, a transmission hole 421 penetrating in the axial direction is formed in the cylinder 42, and a first end (left end in fig. 4) of the cylinder 42 abuts against the second end 33 of the filler tube 3 in a holding state of the holding mechanism and leaves at the second end of the filler tube in a releasing state of the holding mechanism to allow the filler tube 3 to be taken out. The second end (right end in fig. 4) of the cylinder 42 is movable through the through hole of the blocking wall 411 and communicates with the sampling pump 5 through a hose 51, so that the sampling head 2 communicates with the sampling pump 5 through the cylinder 42 of the filler tube and holding mechanism 4 in sequence. To facilitate connection to the hose 51, a hose fitting 424 is provided at the second end of the barrel 42. An operating portion 43 is mounted on the cylinder 42 and projects out of the housing 1 in the radial direction, and the cylinder 42 is driven to move in the axial direction by manually operating the operating portion 43. In this way, the holding mechanism 4 can be reciprocally moved between the position in the holding state and the position in the releasing state.

In an exemplary embodiment, as shown in fig. 1-5, the retention mechanism 4 further comprises a resilient return mechanism, which may comprise a spring 44, the cylinder 42 being movable in a direction away from the filler tube against the resilient force of the resilient return mechanism. In this way, the resilient return mechanism may drive the first end of the barrel 42 resiliently against the second end 33 of the filler tube 3 such that the barrel 42 is in intimate and sealing contact with the second end 33 of the filler tube 3.

In an exemplary embodiment, the barrel 42 includes a first portion 422 and a second portion 423, the second portion 423 having a diameter less than a diameter of the first portion 422, and a step 425 is formed between the first portion 422 and the second portion 423. The spring 44 is sleeved on the second portion 423 and located between the step portion 425 between the first portion 422 and the second portion 423 and the blocking wall 411. In this way, the spring 44 provides a pushing force to the cylinder 42 towards the filler tube 3. It will be appreciated that a spring may be provided between the barrel 42 and the second end 33 of the filler tube 3, provided that the spring applies a spring force to the barrel towards the filler tube.

In an exemplary embodiment, the holding mechanism 4 further comprises a first elastic ring 46 disposed at the first end of the cylinder 42, and the second end 33 of the filler pipe 3 abuts against the first elastic ring 46 and is communicated with the transmission hole 421 of the cylinder 42. In this way, the cylinder 42 can be sealingly engaged with the filler tube 3 to prevent gas leakage.

In an exemplary embodiment, a first filter 47 is disposed between the first end of the cylinder 42 and the first resilient ring 46 to filter impurities in the sampled gas from the filler tube 3.

In an exemplary embodiment, the retaining mechanism further comprises an end cap 45, the end cap 45 configured to retain the first resilient ring 46 at the first end of the cylinder 42, the second end 33 of the filler tube 3 passing through the end cap 45 to abut against the first resilient ring 46. An annular groove is provided on the end face of the first end of the cylinder 42, the first elastic ring 46 is disposed in the annular groove, and the filler pipe 3, the first elastic ring 46, and the delivery hole 421 of the cylinder 42 are concentrically aligned. The inner diameter of the through hole of the first elastic ring 46 is smaller than the inner diameter of the filler tube 3 so that the tube wall of the filler tube 3 abuts against the first elastic ring 46.

In an exemplary embodiment, as shown in fig. 4 and 5, the housing 1 is provided with a slot 12 extending in a direction parallel to the axial direction, and the operating portion 43 protrudes outside the housing 1 through the slot 12. A handle 431 is provided at the upper end of the operating part 43 so that the operator can hold the handle 431 to drive the cylinder 42 to reciprocate right and left. It will be appreciated that the slot 12 defines the range of movement of the operating portion 43 such that the retaining mechanism 4 has a predetermined stroke in the axial direction, facilitating the filler tube 3 placement or removal operation, and maintaining the tightness of the entire deployed channel.

In an exemplary embodiment, as shown in fig. 4 to 7, a side of the slot 12 close to one end of the blocking wall 411 is provided with a first locking groove 121 extending perpendicular to the axial direction, and the operating part 43 can be moved into the first locking groove 121 by a manual operation to hold the holding mechanism 4 in a state of releasing the stuffing tube 3. In this state, the cylinder 42 does not move to the left end of the slot 12 in fig. 7, so that the filler tube 3 can be placed and taken out. Further, a side portion of one end of the slot 12 remote from the blocking wall 411 is provided with a second locking groove 122 extending perpendicularly to the axial direction, and is movable into the second locking groove 122 by operating the operating portion 43 to hold the holding mechanism 4 in a state of pressing the filler tube 3.

In an exemplary embodiment, as shown in fig. 4 and 5, the receiving portion is further provided with a positioning portion 412 opposite to the blocking wall 411 in the axial direction, and the positioning portion 412 is configured to prevent the cylinder 42 from further moving toward the filler pipe 3. Thus, the moving range of the cylinder 42 is limited between the positioning part 412 and the blocking wall 411.

In an exemplary embodiment, one of the interface and sampling head includes a plug and the other of the interface and sampling head includes a socket that receives the plug, the sampling head being in communication with the first end of the filler tube through the combination of the plug and the socket. As shown in fig. 1-3 and 6, the sampling head 2 is provided with a plug 21, the interface 11 comprises a socket 111 for accommodating the plug 21, and the sampling head 2 is communicated with the first end 32 of the filler pipe 3 through the combination of the plug 21 and the socket 111. The cross-sections of the header 21 and the socket 111 may be formed in the shape of a cylinder, an ellipse, a polygon, etc. that are fitted to each other. To prevent erroneous insertion, the cross-sections of the header 21 and the socket 111 may be formed in a trapezoidal shape or other irregular shapes that fit each other. An outwardly radially projecting flange 22 is formed on the plug 21, the flange 22 engaging the end of the socket 111 to increase the sealing effect.

In an alternative embodiment, the interface 11 comprises a plug and the sampling head 2 comprises a socket for receiving the plug, such that the sampling head communicates with the first end of the filler tube via the coupling of the plug and the socket.

In an exemplary embodiment, as shown in fig. 1-3 and 6, a second elastic ring 112 is provided between the plug 21 and the bottom of the socket 111, and the first end 32 of the filler tube 3 abuts against the inner side (right side in fig. 6) of the second elastic ring 112. The filler tube 3, second elastomeric ring 112 and inner bore 23 of the sampling head 2 are concentrically aligned to increase the seal.

In an exemplary embodiment, a filter mesh 113 is disposed between the end of the plug 21 and the second elastic ring 112 to filter impurities in the sample gas. In this way, a bite type seal joint is provided at both ends of the filler pipe 3. The two ends of the packing tube can be sealed by the clamping sleeve joints before and after sampling, so that the sampled gas is prevented from being polluted, and the existing gas detectors such as a chromatograph and the like and a thermal desorber are convenient to perform sample desorption detection and purification treatment. By arranging the first filter screen 47 and the second filter screen 113 with a plurality of micropores on the side of the first elastic ring 46 and the second elastic ring 112, respectively, dust is sucked into the filler pipe 3 during sampling to pollute the filler pipe 3, and/or particles from the filler pipe 3 are sucked into the sampling pump 5 to damage the sampling pump 5. For example, the pores of first filter 47 and second filter 113 have a pore size of less than 300 mesh.

In an exemplary embodiment, as shown in fig. 1-6, the housing 1 includes a mounting portion 13, a body portion 14, and a hand-held portion 15. The interface 11 is arranged at a first end (upper end in fig. 1-3) of the mounting portion 13, and the filler tube 3 is mounted in the mounting portion 13. The second end (lower end in fig. 1 to 3) of the mounting portion 13 is connected to a first side (upper side in fig. 1 to 3) of the main body portion 14, and at least a part of the holding mechanism 4 and the sampling pump 5 are mounted in the main body portion 14. The hand-held portion 15 is mounted on a second side (lower side in fig. 1 to 3) of the main body portion 14 opposite to the first side. Thus, the sampling head 1 is opposed to the hand-held portion 15. The main body portion 14 has a large outer profile relative to the mounting portion 13 and the hand-held portion 15 to accommodate components such as the sampling pump, the operating circuit board, and the portion holding mechanism 4. An operator may hold the hand-held portion 15 and operate the entire hand-held gas sampling assembly 100. It will be appreciated that the entirety of the retaining mechanism 4 may be mounted in the body portion. In another embodiment, one part of the retention mechanism is mounted in the body portion 14 and the other part is mounted in the mounting portion 13.

In an exemplary embodiment, a side surface of the body portion 14 between the first and second sides is provided with an operator panel 141 adapted for operating the hand held gas sampling assembly 100. Further, the operation panel 141 is provided with a speed control switch 142 adapted to control the sampling speed of the sampling pump 5, and a display screen 143 adapted to display the operating state of the handheld gas sampling device 100. For example, the speed regulating switch 142 is set to have different gear positions to control the sampling pump 5 to perform a high-speed sampling or a low-speed sampling operation. After the sampling pump 5 is started, the LED type display screen 143 automatically starts to record the sampling time, so as to conveniently prompt the operator of the sampling time.

In an exemplary embodiment, the power supply 6, or power interface, is provided in the handpiece 15. The power supply 6 comprises a battery pack, for example, consisting of two batteries 18650 in parallel, for providing operating power for the sampling system. In an alternative embodiment, the power supply 6 comprises a rechargeable power supply and a USB charging interface is provided on the housing 1. The operation of the rechargeable power supply can be managed through the operation panel 141. In another alternative embodiment, a power plug, such as a USB power interface, is provided on the handpiece 15.

The handheld gas sampling device provided by the embodiment of the disclosure has the advantages of small volume, light weight and convenience in carrying; the handheld gas sampling device can integrate the existing thermal desorption tube, can repeatedly install and dismantle the filler tube for multiple times, has strong universality, is convenient to be combined with other detectors such as gas chromatography equipment and the like for detecting TVOCs in the existing laboratory and field, is also suitable for being combined with ion mobility spectrometry and electronic nose equipment (such as MI1000 electronic nose series products of the applicant), is suitable for sampling gas of containers such as luggage cases, containers and the like, and further realizes gas detection; this gaseous sampling device of hand-held type sample is convenient, and the gaseous easy storage of sampling, carry have improved sampling efficiency and detecting instrument's environmental suitability.

It will be appreciated by those skilled in the art that the embodiments described above are exemplary and can be modified by those skilled in the art, and that the structures described in the various embodiments can be freely combined without conflict in structure or principle.

Although the present disclosure is described in connection with the accompanying drawings, the embodiments disclosed in the drawings are intended to be illustrative of the preferred embodiments of the disclosure, and should not be construed as limiting the disclosure. Although a few embodiments of the disclosed inventive concept have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the claims and their equivalents.

Claims

1. A hand-held gas sampling device, comprising:

a housing (1);

a sampling head (2) projecting from the housing;

a filler tube (3) mounted within the housing, a first end of the filler tube being in fluid communication with the sampling head, an adsorbent material (31) adapted to adsorb a sampled gas being disposed within the filler tube;

-a retaining mechanism (4) adapted to removably retain the filler tube within the housing (1); and

a sampling pump (5) in fluid communication with the second end of the filler tube through the retention mechanism (4), the sampling pump configured to draw a sampling gas into the filler tube (3) through a sampling head (2),

the holding mechanism includes:

an accommodating portion (41) formed in the case and including a blocking wall (411) having a through hole;

a cylinder (42) movably mounted in the accommodating portion in an axial direction of the filler pipe, a transmission hole (421) penetrating in the axial direction being formed in the cylinder, a first end of the cylinder abutting against a second end of the filler pipe in a holding state of a holding mechanism, the second end of the cylinder being movable through the through hole of the blocking wall and communicating with the sampling pump through a hose so that the sampling head communicates with the sampling pump; and

an operating portion (43) mounted on the cylinder and projecting out of the housing in a radial direction, the cylinder being driven to move in the axial direction by operating the operating portion.

2. The hand-held gas sampling device of claim 1, wherein the retention mechanism is adapted to retain the filler tube in the housing (1) during sampling by a sampling pump and to allow removal of the filler tube from the housing (1) after sampling by a sampling pump.

3. The hand-held gas sampling device according to claim 1, wherein an interface (11) is provided on the housing, the sampling head being mounted from outside the housing onto an outside of the interface, the first end of the filler tube engaging an inside of the interface.

4. The hand-held gas sampling device of claim 1, wherein the retention mechanism further comprises a resilient return mechanism, the barrel being movable in a direction away from the filler tube against a spring force of the resilient return mechanism.

5. The hand-held gaseous sampling apparatus of claim 4, wherein the cartridge comprises:

a first portion (422); and

a second portion (423) having a diameter directly smaller than the first portion;

the elastic return mechanism comprises a spring (44) which is sleeved on the second part and is positioned between a step part (425) between the first part and the second part and the blocking wall.

6. The hand-held gas sampling device of any of claims 1-5, wherein the retention mechanism further comprises a first resilient ring (46) disposed at the first end of the barrel, the second end of the filler tube abutting against the first resilient ring and communicating with the delivery aperture of the barrel.

7. The hand-held gas sampling device of claim 6, wherein the retention mechanism further comprises an end cap (45) configured to retain the first resilient ring at the first end of the barrel, the second end of the filler tube abutting the first resilient ring through the end cap.

8. The hand-held gas sampling device of claim 6, wherein a first filter (47) is disposed between the first end of the barrel and the first resilient ring.

9. The hand-held gas sampling device according to any one of claims 1-5, wherein the housing is provided with a slot (12) through which the operating portion protrudes outside of the housing.

10. The hand-held gas sampling device according to claim 9, wherein a side of the slot near one end of the blocking wall is provided with a first locking groove (121) extending perpendicular to the axial direction, into which the holding mechanism can be moved by operating the operating portion to hold the holding mechanism in a state in which the filler tube is released.

11. A hand-held gas sampling apparatus according to claim 9, wherein the side of the slot remote from the end of the blocking wall is provided with a second locking slot (122) extending perpendicular to the axial direction, into which second locking slot the operating portion is movable by operation to hold the retaining mechanism in a state in which it is squeezed against the filler tube.

12. The hand-held gas sampling device of any of claims 1-5, wherein the receptacle is further provided with a positioning portion (412) opposite the blocking wall, the positioning portion configured to prevent further movement of the cartridge toward the filler tube.

13. The hand-held gas sampling device of claim 3, wherein one of the interface and sampling head comprises a plug (21), and the other of the interface and sampling head comprises a socket (111) that receives the plug, the sampling head being in communication with the first end of the filler tube through the combination of the plug and the socket.

14. The hand-held gas sampling device of claim 13, wherein a second resilient ring (112) is provided between the plug and the bottom of the socket, the first end of the filler tube abutting the inside of the second resilient ring.

15. The hand-held gas sampling device of claim 14, wherein a second filter (113) is disposed between an end of the plug and the second resilient ring.

16. The hand-held gaseous sampling apparatus of claim 3, wherein the housing comprises:

a mounting portion (13) at a first end of which the interface is disposed, the filler tube being mounted in the mounting portion;

a body portion (14) having a second end connected to a first side of the body portion, at least a portion of the retention mechanism and the sampling pump being mounted in the body portion; and

a hand-held portion (15) mounted on a second side of the body portion opposite the first side.

17. The hand-held gaseous sampling apparatus of claim 16, wherein an operating panel (141) is provided on one side of the body portion between the first and second sides.

18. The hand-held gas sampling device of claim 17, wherein the operating panel is provided with a speed regulating switch (142) adapted to control the sampling speed of the sampling pump, and a display screen (143) adapted to display the operating state of the hand-held gas sampling device.

19. The hand-held gaseous sampling apparatus according to claim 16, wherein a power source (6) or power source interface is provided within the hand-held portion.