Purging sampling device for gas chromatograph

Abstract

The utility model discloses a purging sampling device for a gas chromatograph, which comprises a base, a purging bottle and a plug-in mechanism, and the base is provided with a catcher and a gas supply bottle; the inserting mechanism comprises a supporting seat, a fixing block and a first driving piece, the fixed end of the first driving piece is arranged on the machine base, the supporting seat is connected to the output end of the first driving piece, a positioning groove is formed in the upper end face of the supporting seat, the purging bottle can be clamped in the positioning groove, and the fixing block is fixedly arranged on the machine base and located over the supporting seat; the fixed block is fixedly provided with a vertical first gas needle and a vertical second gas needle, the first gas needle is communicated with the gas supply bottle, the second gas needle is communicated with the gas inlet end of the trap, and the first driving part is used for driving the supporting seat to move up and down in the direction close to or away from the fixed block, so that the first gas needle and the second gas needle can be inserted into the purging bottle; the conveying mechanism is used for conveying the blowing bottles to the supporting base. Automatic sampling can be realized, so that the sampling efficiency is improved and the manual labor intensity is reduced.

Description

Technical Field

[0001] This utility model relates to the field of gas chromatography technology, and in particular to a purge sampling device for gas chromatography. Background Technology

[0002] Gas chromatographs are chromatographic analysis instruments that use gas as the mobile phase. Before analyzing volatile organic compounds in water and soil, a purge sampling device is needed to collect samples by purging and trapping. This simplifies the extraction, concentration, and purification processes, thereby improving sampling efficiency. The purge sampling device mainly consists of a purge bottle, a gas supply bottle, and a trap. The principle is to pass inert gas from the gas supply bottle into the purge bottle, and after passing through the sample in the purge bottle, the target component is carried to the trap for adsorption and capture, thus completing the sampling. Existing purge sampling devices require manual connection of the purge bottle to both the gas supply bottle and the trap, which is not only cumbersome and labor-intensive but also has low sampling efficiency. Utility Model Content

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, this invention provides a purge sampling device for gas chromatographs, which can automatically sample without requiring manual connection of the purge bottle to the gas supply bottle and the collector, thereby improving sampling efficiency and reducing manual labor intensity.

[0004] According to an embodiment of this utility model, a purge sampling device for a gas chromatograph is provided, including a base, a purge bottle, and a connection mechanism. The base is provided with a trap and a gas supply bottle. The trap is used to adsorb and trap target components. The purge bottle is used to hold samples. The connection mechanism includes a support, a fixing block, and a first driving member. The fixed end of the first driving member is disposed on the base. The support is connected to the output end of the first driving member. A positioning groove is formed on the upper surface of the support, and the purge bottle can be clamped into the positioning groove. The fixing block is fixedly disposed on the base and is located directly above the support. The fixing block is fixedly disposed with a vertical first gas needle and a second gas needle. The first gas needle is connected to the gas supply bottle, and the gas supply bottle is used to supply inert gas to the first gas needle. The second gas needle is connected to the inlet end of the trap. The first driving member is used to drive the support to move up and down towards or away from the fixing block so that the first gas needle and the second gas needle can be inserted into the purge bottle. The conveying mechanism is used to convey the purge bottle to the support.

[0005] A purge sampling device for a gas chromatograph according to an embodiment of the present invention has at least the following beneficial effects: During sampling, a purge bottle containing the sample is transported to a support base by a conveying mechanism, so that the purge bottle is locked in a positioning groove to position the purge bottle. Then, a first driving member drives the support base to move upward towards the fixed block to a preset height position, so that the first and second gas needles are inserted into the purge bottle. Then, an inert gas is supplied to the first gas needle through a gas supply bottle, so that the inert gas is introduced into the sample in the purge bottle from the first gas needle. After the inert gas comes into contact with the sample, it adsorbs the target component and carries it along the second gas needle to the trap for adsorption and collection. Thus, automatic sampling is possible without the need for manual connection of the purge bottle to the gas supply bottle and the trap, thereby improving sampling efficiency and reducing manual labor intensity.

[0006] According to some embodiments of the present invention, a limiting plate is provided below the fixing block, the limiting plate is connected to the machine base, and the limiting plate can abut against the upper cap of the purge bottle to restrict the support from moving towards the fixing block.

[0007] According to some embodiments of the present invention, the base is provided with a second driving member, the limiting plate is slidably connected to the base, and the second driving member is used to drive the limiting plate to move up and down.

[0008] According to some embodiments of the present invention, the limiting plate has two positioning holes, and the first air needle and the second air needle are respectively inserted into the two positioning holes.

[0009] According to some embodiments of the present invention, the opening of the positioning groove is provided with a tapered guide portion, and the diameter of the tapered guide portion gradually increases along the axial direction towards the fixing block.

[0010] According to some embodiments of the present invention, the conveying mechanism includes a material tray, a slide block, a third driving member, a fourth driving member, and a pneumatic gripper. The slide block is slidably connected to the machine base. The third driving member is used to drive the slide block to move horizontally towards or away from the support base. The pneumatic gripper is slidably connected to the slide block. The fourth driving member is used to drive the pneumatic gripper to move up and down. The pneumatic gripper is used to grip the purge bottle. The material tray is disposed below the pneumatic gripper. The material tray has multiple slots. The multiple slots are evenly spaced along the moving direction of the slide block. The purge bottle can be inserted into the slot.

[0011] According to some embodiments of this utility model, the gas supply cylinder and the first gas needle are connected by a first gas pipe, a filter screen is provided in the first gas pipe, and the first gas pipe is connected to a first one-way valve and a flow control valve.

[0012] According to some embodiments of the present invention, the second air needle and the trap are connected by a second air pipe, and the second air pipe is connected to a second one-way valve.

[0013] According to some embodiments of the present invention, a heating tube is spirally wound around the outside of the trap, and a protective cover is fitted over the heating tube.

[0014] According to some embodiments of this utility model, the lower ends of both the first air needle and the second air needle are configured as spikes.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0017] Figure 1 This is a schematic diagram of the structure of the purge sampling device for a gas chromatograph according to an embodiment of the present invention;

[0018] Figure 2 This is a partial top view of the purge sampling device for a gas chromatograph according to an embodiment of the present invention;

[0019] Figure 3 This is a partial cross-sectional view of the trap of the purge sampling device for a gas chromatograph according to an embodiment of the present invention;

[0020] Figure 4 This is a cross-sectional view of the support base of the purge sampling device for a gas chromatograph according to an embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the structure of the limiting plate of the purge sampling device for a gas chromatograph according to an embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of the structure of the purge bottle of the gas chromatograph purge sampling device in the plugged-in state according to an embodiment of the present invention.

[0023] Explanation of reference numerals in the attached figures:

[0024] The components include: base 100, collector 110, heating tube 111, protective cover 112, exhaust nozzle 113, valve 114, air supply bottle 120, purge bottle 200, insertion mechanism 300, support base 310, positioning groove 311, conical guide 312, fixing block 320, first drive component 330, first air needle 340, second air needle 350, spike 360, conveying mechanism 400, tray 410, slot 411, slide 420, third drive component 430, fourth drive component 440, pneumatic gripper 450, limit plate 500, positioning hole 510, second drive component 600, first air pipe 700, filter screen 710, first one-way valve 720, flow control valve 730, second air pipe 800, and second one-way valve 810. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0026] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0028] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0029] Understandably, referring to Figures 1 to 6This utility model discloses a purge sampling device for a gas chromatograph, comprising a base 100, a purge bottle 200, and a connection mechanism 300. The base 100 is equipped with a trap 110 and a gas supply bottle 120. The trap 110 is used to adsorb and trap the target component. The purge bottle 200 is used to hold the sample. The connection mechanism 300 includes a support base 310, a fixing block 320, and a first driving member 330. The fixing end of the first driving member 330 is disposed on the base 100, and the support base 310 is connected to the output end of the first driving member 330. A positioning groove 311 is formed on the upper end surface of the support base 310, and the purge bottle 200 can be clamped into the positioning groove 311. The fixing block 320... The 0 is fixedly installed on the base 100, and the fixing block 320 is located directly above the support base 310. The fixing block 320 is fixedly equipped with a vertical first air needle 340 and a second air needle 350. The first air needle 340 is connected to the gas supply cylinder 120, which is used to supply inert gas to the first air needle 340. The second air needle 350 is connected to the air inlet end of the trap 110. The first driving member 330 is used to drive the support base 310 to move up and down towards or away from the fixing block 320 so that the first air needle 340 and the second air needle 350 can be inserted into the purge bottle 200. The conveying mechanism 400 is used to convey the purge bottle 200 to the support base 310.

[0030] During sampling, the purge bottle 200 containing the sample is conveyed to the support base 310 via the conveying mechanism 400, so that the purge bottle 200 is locked in the positioning groove 311 to position the purge bottle 200. Then, the support base 310 is driven to rise and move towards the fixed block 320 to a preset height position via the first driving member 330, so that the first gas needle 340 and the second gas needle 350 are inserted into the purge bottle 200. Then, inert gas is supplied to the first gas needle 340 via the gas supply bottle 120, so that the inert gas is input into the sample in the purge bottle 200 from the first gas needle 340. After the inert gas comes into contact with the sample, it adsorbs the target component and carries it along the second gas needle 350 to the trap 110 for adsorption and trapping. This enables automatic sampling without the need for manual connection of the purge bottle 200 to the gas supply bottle 120 and the trap 110, thereby improving sampling efficiency and reducing manual labor intensity.

[0031] It should be noted that the gas outlet of the trap 110 is equipped with an exhaust port 113, and the exhaust port 113 is equipped with a valve 114. The exhaust port 113 is connected to the chromatographic column of the gas chromatograph through the valve 114. When sampling, the valve 114 is closed. After the trap 110 has adsorbed and captured the target component, the trap 110 is heated to release the captured target component through thermal desorption. At the same time, the valve 114 is opened, so that the exhaust port 113 is connected to the chromatographic column of the gas chromatograph to deliver the target component to the chromatographic column for separation, thereby facilitating detection.

[0032] The trap 110 is equipped with an adsorbent, which has adsorption and selectivity for the target component.

[0033] The cap of the purge bottle 200 is made of silicone and can be pierced by the first air needle 340 and the second air needle 350, forming a seal at the piercing position, so that the target component can be carried out by the inert gas along the second air needle 350 to the collector 110.

[0034] Reference Figure 6 The length of the lower end of the first air needle 340 extending out of the fixing block 320 is greater than the length of the lower end of the second air needle 350 extending out of the fixing block 320. When the insertion is completed, the lower end of the first air needle 340 is below the sample liquid surface, while the lower end of the second air needle 350 is above the sample liquid surface, thereby reducing the possibility of the sample entering the collector 110 along the second air needle 350.

[0035] The first driving component 330 can be a cylinder, hydraulic cylinder, or electric push rod, etc., capable of driving the support base 310 to move up or down towards or away from the fixed block 320.

[0036] Understandably, referring to Figure 1 and Figure 6 A limiting plate 500 is provided below the fixing block 320. The limiting plate 500 is connected to the base 100 and can abut against the upper cap of the purge bottle 200 to restrict the support base 310 from moving closer to the fixing block 320. By using the limiting plate 500 to abut against the upper cap of the purge bottle 200 to restrict the support base 310 from moving closer to the fixing block 320, the possibility of the first air needle 340 piercing the purge bottle 200 due to the purge bottle 200 rising too high can be reduced, thereby improving the stability of the insertion.

[0037] After sampling is completed, the first driving member 330 drives the support base 310 to move downward away from the fixed block 320, thereby driving the purge bottle 200 to move downward, so that the first air needle 340 and the second air needle 350 are separated from the purge bottle 200. During the separation process, the purge bottle 200 is easily adhered to the first air needle 340 and the second air needle 350, thereby causing the purge bottle 200 to detach from the positioning groove 311.

[0038] Specifically, refer to Figure 1The base 100 is provided with a second driving member 600, and a limiting plate 500 is slidably connected to the base 100. The second driving member 600 is used to drive the limiting plate 500 to move up and down. During the process of the first air needle 340 and the second air needle 350 disengaging from the purge bottle 200, the limiting plate 500 is driven to move down by the second driving member 600, so that the limiting plate 500 abuts against the upper cap of the purge bottle 200 and drives the purge bottle 200 to move down, thereby completing the separation and reducing the possibility of the purge bottle 200 disengaging from the positioning groove 311.

[0039] Specifically, refer to Figure 5 and Figure 6 The limiting plate 500 has two positioning holes 510, through which the first air needle 340 and the second air needle 350 pass respectively. By radially positioning the first air needle 340 and the second air needle 350 through the two positioning holes 510, the possibility of the first air needle 340 and the second air needle 350 tilting due to pressure can be reduced, so as to maintain a vertical insertion state and thus improve the stability of the insertion.

[0040] Understandably, referring to Figure 2 and Figure 4 The opening of the positioning groove 311 is provided with a conical guide 312, the diameter of which gradually increases axially towards the fixing block 320. Because the diameter of the conical guide 312 gradually increases axially towards the fixing block 320, the conical slope of the guide 312 gradually guides the purge bottle 200 into the positioning groove 311, improving the accuracy and smoothness of the purge bottle 200's mounting and positioning.

[0041] Understandably, referring to Figure 1 and Figure 2The conveying mechanism 400 includes a tray 410, a slide 420, a third drive member 430, a fourth drive member 440, and a pneumatic gripper 450. The slide 420 is slidably connected to the base 100. The third drive member 430 is used to drive the slide 420 to move horizontally towards or away from the support base 310. The pneumatic gripper 450 is slidably connected to the slide 420. The fourth drive member 440 is used to drive the pneumatic gripper 450 to move up and down. The pneumatic gripper 450 is used to grip the purge bottle 200. The tray 410 is located below the pneumatic gripper 450. The tray 410 has multiple slots 411. The multiple slots 411 are evenly spaced along the moving direction of the slide 420. The purge bottle 200 can be inserted into the slots 411. Since the tray 410 has multiple slots 411, and the multiple slots 411 are evenly spaced along the moving direction of the slide 420, multiple purge bottles 200 containing different samples can be conveniently stored by inserting them into different slots 411. The pneumatic gripper 450 is driven to move up and down by the fourth drive unit 440, so that the pneumatic gripper 450 can pick up the purge bottle 200 one by one. In conjunction with the third drive unit 430, the slide 420 is driven to move horizontally towards or away from the support base 310, so as to realize the transfer of the purge bottle 200 between the tray 410 and the support base 310. This makes it convenient to sample multiple samples one by one, thereby improving sampling efficiency.

[0042] It should be noted that the third drive component 430 and the fourth drive component 440 can both be cylinders, hydraulic cylinders or linear slide modules, etc., as long as they can drive the slide 420 and the pneumatic gripper 450 to perform corresponding actions.

[0043] Understandably, referring to Figure 1 The gas supply cylinder 120 and the first gas needle 340 are connected by a first gas pipe 700. A filter screen 710 is installed inside the first gas pipe 700, which is connected to a first one-way valve 720 and a flow control valve 730. Because the filter screen 710 filters the inert gas entering the purge bottle 200, it removes particulate impurities, improving the purity of the inert gas. The first one-way valve 720 prevents the sample in the purge bottle 200 from flowing back into the gas supply cylinder 120. The flow control valve 730 adjusts the gas flow rate entering the purge bottle 200 to meet different sampling requirements.

[0044] Understandably, referring to Figure 1 The second gas needle 350 and the collector 110 are connected by a second gas tube 800, which is connected to a second one-way valve 810. The second one-way valve 810 can prevent the gas in the collector 110 from flowing back into the purge bottle 200, thereby improving the stability of sampling.

[0045] Understandably, referring to Figure 1 and Figure 3 The collector 110 has a heating tube 111 spirally wound around its outer side, and a protective cover 112 is fitted over the heating tube 111. The collector 110 is heated by the heating tube 111 to achieve thermal desorption, and the protective cover 112 reduces heat loss and lowers the risk of burns to the operator from accidentally touching the heating tube 111.

[0046] Understandably, referring to Figure 6 The lower ends of the first air needle 340 and the second air needle 350 are both provided with spikes 360. The spikes 360 are used to pierce the cap of the purge bottle 200 to facilitate the insertion of the first air needle 340 and the second air needle 350 into the purge bottle 200.

[0047] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A purge and sample device for a gas chromatograph, characterized by, The utility model relates to a kind of gas chromatography, including: Machine base, the machine base is provided with trap and gas supply bottle, the trap is used to absorb target component; Purging bottle for containing sample; Plug-in mechanism, including support seat, fixed block and first driving part, the fixed end of the first driving part is arranged in the machine base, the support seat is connected to the output end of the first driving part, the upper end surface of the support seat is provided with positioning slot, the purging bottle can be clamped in the positioning slot, the fixed block is fixedly arranged on the machine base, and the fixed block is located directly above the support seat, the fixed block is fixedly provided with vertical first gas needle and second gas needle, the first gas needle is communicated with the gas supply bottle, the gas supply bottle is used to transport inert gas to the first gas needle, the second gas needle is communicated with the gas inlet end of the trap, and the first driving part is used to drive the support seat to move up and down in the direction of approaching or away from the fixed block, so that the first gas needle and the second gas needle can be inserted into the purging bottle; Conveying mechanism for conveying the purging bottle to the support seat.

2. The purge and sample device for a gas chromatograph of claim 1, wherein, The lower side of the fixed block is provided with a limiting plate, the limiting plate is connected to the machine base, and the limiting plate can abut against the upper end bottle cap of the purging bottle to limit the movement of the support seat in the direction of approaching the fixed block.

3. The purge and sample device for a gas chromatograph of claim 2, wherein, The machine base is provided with a second driving part, the limiting plate is slidingly connected to the machine base, and the second driving part is used to drive the limiting plate to move up and down.

4. The purge and sample device for a gas chromatograph of claim 2, wherein, The limiting plate is provided with two positioning holes, and the first gas needle and the second gas needle are respectively arranged in the two positioning holes.

5. The purge and sample device for a gas chromatograph of claim 1, wherein, The notch of the positioning slot is provided with a tapered guide portion, and the diameter of the tapered guide portion gradually increases in the direction of approaching the fixed block along the axial direction.

6. The purge and sample device for a gas chromatograph of claim 1, wherein, The conveying mechanism includes a tray, a sliding seat, a third driving part, a fourth driving part and a pneumatic clamp jaw, the sliding seat is slidingly connected to the machine base, the third driving part is used to drive the sliding seat to move horizontally in the direction of approaching or away from the support seat, the pneumatic clamp jaw is slidingly connected to the sliding seat, the fourth driving part is used to drive the pneumatic clamp jaw to move up and down, the pneumatic clamp jaw is used to clamp the purging bottle, the tray is arranged below the pneumatic clamp jaw, the tray is provided with a plurality of insertion grooves, and the plurality of insertion grooves are uniformly arranged along the moving direction of the sliding seat, and the purging bottle can be inserted into the insertion groove.

7. The purge and sample device for a gas chromatograph of claim 1, wherein, The gas supply bottle and the first gas needle are communicated through a first gas pipe, the first gas pipe is provided with a filter screen, the first gas pipe is connected with a first one-way valve and a flow control valve.

8. The purge and sample device for a gas chromatograph of claim 1, wherein, The second gas needle and the trap are communicated through a second gas pipe, and the second gas pipe is connected with a second one-way valve.

9. The purge and sample device for a gas chromatograph of claim 1, wherein, The trap is spirally wound with a heating pipe, and the heating pipe is sleeved with a protective cover.

10. The purge and sample device for a gas chromatograph of claim 1, wherein, The lower end of the first gas needle and the second gas needle is provided with a sharp portion.

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