CN216208848U

CN216208848U - A headspace sampling device for screening of volatile organic compounds

Info

Publication number: CN216208848U
Application number: CN202122678008.1U
Authority: CN
Inventors: 张佳佳; 陈雪
Original assignee: Zhengzhou Tongbiao Environmental Testing Co ltd
Current assignee: Zhengzhou Tongbiao Environmental Testing Co ltd
Priority date: 2021-11-04
Filing date: 2021-11-04
Publication date: 2022-04-05
Anticipated expiration: 2031-11-04

Abstract

The utility model discloses a headspace sampling device for screening volatile organic compounds, which relates to the technical field of headspace sampling and comprises a feeding gallery, a sampling box and a discharging gallery, wherein the feeding gallery is fixedly arranged on the left side of the sampling box, the discharging gallery is fixedly arranged on the right side of the sampling box, conveying devices penetrate through the feeding gallery, the sampling box and the discharging gallery, a rotating shaft is arranged in the sampling box and positioned behind the conveying devices through a bearing, a rotating disc is fixedly arranged at the upper end of the rotating shaft, and the front side of the rotating disc is positioned above the conveying devices; has the advantages that: the sampling space is isolated by arranging the feeding gallery, the sampling box and the discharging gallery, so that the operation safety is improved; the conveying device is arranged to convey the feeding materials, so that continuous sampling is realized, and meanwhile, scalding caused by taking out a high-temperature sampling bottle by hands after sampling is finished is avoided; set up the jacking room in the water tank below, reduce the electric push rod and be heated, prolong its life.

Description

A headspace sampling device for screening of volatile organic compounds

Technical Field

The utility model relates to the technical field of headspace sampling, in particular to a headspace sampling device for screening volatile organic compounds.

Background

The headspace analysis technology is a convenient and fast sample pretreatment method in gas chromatography, and the principle is that a sample to be detected is placed in a closed container, volatile components are volatilized from a sample matrix through heating, balance is achieved in a gas-liquid (or gas-solid) two phase, and top gas is directly extracted for chromatographic analysis, so that the components and the content of the volatile components in the sample are detected. The detection process of the headspace analysis technology comprises the following steps: a certain amount of samples (solid or liquid) are filled into a headspace sample bottle and sealed, the sample bottle is heated in a headspace sample injector to reach phase equilibrium (gas-liquid equilibrium or gas-solid equilibrium) at a certain temperature, then a gas phase balanced in the headspace space of the sample bottle is guided into a sample ring through a sample injection system of the headspace sample injector, then the gas in the sample ring is blown into a sample injection port pipe of gas chromatography through carrier gas of the headspace sample injector, and then separation detection is realized through a chromatographic column and a detector of a gas chromatograph, while the existing headspace sample injector places the headspace bottle filled with the samples in a headspace positioning slot hole on a sample tray for positioning and heating, the headspace bottle filled with the samples needs to be taken out of the headspace positioning slot hole on the sample tray by bare hands after headspace analysis of the samples, because the headspace bottle is not easy to take out by bare hands embedded in the headspace positioning slot hole, therefore, the headspace sampling device for screening the volatile organic compounds is provided.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problems and provide a headspace sampling device for screening volatile organic compounds.

The utility model realizes the purpose through the following technical scheme:

a headspace sampling device for screening volatile organic compounds comprises a feeding gallery, a sampling box and a discharging gallery, wherein the feeding gallery is fixedly arranged on the left side of the sampling box, the discharging gallery is fixedly arranged on the right side of the sampling box, conveying devices penetrate through the feeding gallery, the sampling box and the discharging gallery, a rotating shaft is arranged in the sampling box and located behind the conveying devices through bearings, a rotating disc is fixedly mounted at the upper end of the rotating shaft, the front side of the rotating disc is located above the conveying devices, clamping grooves are uniformly formed in the edge of the rotating disc, a check ring is fixedly mounted on the bottom surface of the inner part of the sampling box corresponding to the edge of the rotating disc, and a heating groove is formed in the bottom surface of the inner part of the sampling box corresponding to the clamping groove in the rear side of the rotating disc; a supporting plate is fixedly arranged on the rear side of the retaining ring corresponding to the position of the heating groove, a sampling table is fixedly arranged on the supporting plate corresponding to the upper part of the heating groove, a movable hole is formed in the sampling table corresponding to the center of the heating groove, a sampling hole is formed below the movable hole, a sampling needle is inserted into the movable hole, a reset spring is arranged below the sampling needle, the lower end of the reset spring is fixedly connected to the bottom of the movable hole, the lower end of the sampling needle corresponds to the sampling hole, a vertical air cylinder is fixedly arranged at the upper end of the supporting plate, a pressing block is fixedly arranged at the lower end of the air cylinder, and the pressing block is aligned with the sampling needle in the vertical direction; the left side of the sampling needle is hermetically connected with a carrier gas inlet pipe, the right side of the sampling needle is hermetically connected with a carrier gas outlet pipe, and the side surfaces of the left side and the right side of the sampling platform are respectively provided with a movable groove corresponding to the carrier gas inlet pipe and the carrier gas outlet pipe; a heat conducting cup is fixedly arranged in the bottom of the sampling box corresponding to the heating groove, a water tank is arranged below the heat conducting cup, a heater is fixedly arranged at the bottom of the water tank, a supporting plate is movably arranged in the heat conducting cup, a top rod is fixedly arranged in the middle of the lower surface of the supporting plate, a jacking chamber is arranged below the water tank, an electric push rod is fixedly arranged in the jacking chamber, and the lower end of the top rod extends into the jacking chamber and is fixedly connected with the moving end of the electric push rod; the pivot lower extreme extends to in the sample bottom of the case, correspond in the sample bottom of the case the pivot lower extreme is provided with the drive chamber, fixed mounting has driving motor in the drive chamber, driving motor's output with pivot fixed connection.

Preferably: and the carrier gas inlet pipe and the carrier gas outlet pipe are respectively provided with a one-way valve in a sealing way.

Preferably: the conveying device comprises a conveying motor, a belt roller, a conveying belt and a baffle, wherein the belt roller is installed on the feeding gallery and the discharging gallery through bearings, the conveying belt is wound on the belt roller, the conveying motor drives the belt roller to rotate through mechanical connection, the upper surface of the conveying belt is level with the bottom surface inside the sampling box, and the bottom surface of the sampling box corresponds to the baffle used for limiting the excursion of a headspace sample bottle fixedly installed at the edge of the conveying belt.

Compared with the prior art, the utility model has the beneficial effects that: the sampling space is isolated by arranging the feeding gallery, the sampling box and the discharging gallery, so that the operation safety is improved; the conveying device is arranged to convey the feeding materials, so that continuous sampling is realized, and meanwhile, scalding caused by taking out a high-temperature sampling bottle by hands after sampling is finished is avoided; set up the jacking room in the water tank below, reduce the electric push rod and be heated, prolong its life.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic top view of a headspace sampling device for screening volatile organic compounds according to the present invention.

Fig. 2 is a top view of a headspace sampling device for volatile organic compound screening according to the present invention.

Fig. 3 is a cross-sectional view a-a of a headspace sampling device for volatile organic compound screening according to the present invention.

Fig. 4 is a left side view of a sample station of a headspace sampling device for volatile organic screening according to the present invention.

Fig. 5 is a front view of a sample station of a headspace sampling device for volatile organic screening according to the present invention.

The reference numerals are explained below:

1. a conveying device; 2. a feed gallery; 3. a sampling box; 4. a discharge corridor; 5. a support plate; 6. a heating tank; 7. a turntable; 8. a card slot; 9. a retainer ring; 10. briquetting; 11. a cylinder; 12. a sampling stage; 13. a return spring; 14. a sampling hole; 15. a movable hole; 16. a sampling needle; 17. a rotating shaft; 19. a drive chamber; 20. a drive motor; 21. a heater; 22. a water tank; 23. a heat conducting cup; 24. a carrier gas inlet tube; 25. a movable groove; 26. a carrier gas outlet pipe; 27. a jacking chamber; 28. an electric push rod; 29. a top rod; 30. and (7) a supporting plate.

Detailed Description

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore are not to be construed as limiting the utility model, and further, the terms "first", "second", etc., are used only for descriptive purposes and are not intended to indicate or imply relative importance or to implicitly indicate the number of technical features indicated, whereby the features defined as "first", "second", etc., may explicitly or implicitly include one or more of such features, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, and the two elements may be communicated with each other, and the specific meaning of the above terms in the present invention will be understood by those skilled in the art through specific situations.

The utility model will be further described with reference to the accompanying drawings in which:

as shown in figures 1-5, a headspace sampling device for screening volatile organic compounds comprises a feeding gallery 2, a sampling box 3 and a discharging gallery 4, wherein the left side of the sampling box 3 is fixedly provided with the feeding gallery 2, the feeding gallery 2 is used for feeding, the right side of the sampling box 3 is fixedly provided with the discharging gallery 4, the discharging gallery 4 is used for discharging, a conveying device 1 penetrates through the feeding gallery 2, the sampling box 3 and the discharging gallery 4, the conveying device 1 is used for conveying, a rotating shaft 17 is arranged in the sampling box 3 and is positioned behind the conveying device 1 through a bearing, the rotating shaft 17 is used for transmission, a turntable 7 is fixedly arranged at the upper end of the rotating shaft 17, the turntable 7 is used for rotating, the front side of the turntable 7 is positioned above the conveying device 1, clamping grooves 8 are uniformly arranged at the edge of the turntable 7, the clamping grooves 8 are used for clamping bottles, a check ring 9 is fixedly arranged at the bottom surface in the sampling box 3 corresponding to the edge of the turntable 7, the check ring 9 is used for blocking, and the bottom surface in the sampling box 3 is provided with a heating groove 6 corresponding to the clamping groove 8 at the rear side of the turntable 7; the rear side of the retainer ring 9 is fixedly provided with a support plate 5 corresponding to the position of the heating groove 6, the support plate 5 is used for supporting, a sampling table 12 is fixedly arranged on the support plate 5 corresponding to the upper part of the heating groove 6, the sampling table 12 is used for sampling, a movable hole 15 is formed in the sampling table 12 corresponding to the center of the heating groove 6, a sampling hole 14 is formed below the movable hole 15, a sampling needle 16 is inserted into the movable hole 15, the sampling needle 16 is used for sampling, a reset spring 13 is arranged below the sampling needle 16, the reset spring 13 is used for resetting and supporting, the lower end of the reset spring 13 is fixedly connected to the bottom of the movable hole 15, the lower end of the sampling needle 16 corresponds to the sampling hole 14, a vertical air cylinder 11 is fixedly arranged at the upper end of the support plate 5, the air cylinder 11 is used for pushing, a press block 10 is fixedly arranged at the lower end of the air cylinder 11, the press block 10 is used for pressing, and the press block 10 is aligned with the sampling needle 16 in the vertical direction; a carrier gas inlet pipe 24 is hermetically connected to the left side of the sampling needle 16, a carrier gas outlet pipe 26 is hermetically connected to the right side of the sampling needle 16, and movable grooves 25 are respectively formed in the left side and the right side of the sampling platform 12 corresponding to the carrier gas inlet pipe 24 and the carrier gas outlet pipe 26; a heat conducting cup 23 is fixedly arranged in the bottom of the sampling box 3 corresponding to the heating groove 6, the heat conducting cup 23 is used for conducting heat and heating, a water tank 22 is arranged below the heat conducting cup 23, the water tank 22 is used for containing water, a heater 21 is fixedly arranged at the bottom of the water tank 22, the heater 21 is used for heating, a supporting plate 30 is movably arranged in the heat conducting cup 23, the supporting plate 30 is used for supporting, a mandril 29 is fixedly arranged in the middle of the lower surface of the supporting plate 30, the mandril 29 is used for transmission, a jacking chamber 27 is arranged below the water tank 22, an electric push rod 28 is fixedly arranged in the jacking chamber 27, the electric push rod 28 is used for pushing, and the lower end of the mandril 29 extends into the jacking chamber 27 and is fixedly connected with the moving end of the electric push rod 28; the lower end of the rotating shaft 17 extends into the bottom of the sampling box 3, a driving chamber 19 is arranged in the bottom of the sampling box 3 corresponding to the lower end of the rotating shaft 17, a driving motor 20 is fixedly arranged in the driving chamber 19, and the output end of the driving motor 20 is fixedly connected with the rotating shaft 17; the carrier gas inlet pipe 24 and the carrier gas outlet pipe 26 are respectively provided with a one-way valve in a sealing way; conveyer 1 includes conveying motor, takes the roller, conveyer belt and baffle, takes the roller to install respectively on feeding corridor 2 and ejection of compact corridor 4 through the bearing, and the conveyer belt winding is taken the roller on taking, and conveying motor drives through mechanical connection and takes the roller to rotate, and the conveyer belt upper surface is flat mutually with the inside bottom surface of

sampling box

3, and 3 bottom surfaces of sampling box correspond conveyer belt border fixed mounting and have the baffle that is used for restricting the skew of headspace sample bottle.

The working principle is as follows: when the sampling device is used, an external power supply is electrified, a sample bottle to be sampled is placed on the conveying device 1 from the feeding gallery 2, the conveying device 1 is started to convey, the driving motor 20 is started to drive the rotary table 7 to rotate, the sample bottle is driven to rotate through the clamping groove 8 on the rotary table 7 to the position of the heating groove 6, the sample bottle falls into the heating groove 6, namely the heat conducting cup 23, the heater 21 is started to heat, the water temperature of the water tank 22 rises to heat the sample bottle, after gas-liquid balance, the starting cylinder 11 extends to push the sampling needle 16 to move downwards, the reset spring 13 compresses, the lower end of the sampling needle 16 penetrates through the rubber cover of the sample bottle to enter the sample bottle, upper gas enters the sampling needle 16 in the sample bottle due to air pressure, the upper gas is brought into the detection device along with the carrier gas to finish headspace sampling, then the starting cylinder 11 contracts, the reset spring 13 resets, the sampling needle 16 upwards, the electric push rod 28 is started to push the push rod 29, the supporting plate 30 moves upwards to be level with the bottom surface of the sampling box 3, the rotating disc 7 is rotated, the electric push rod 28 contracts, and the supporting plate 30 falls to the bottom of the heating groove 6, so that the next sample bottle can be sampled.

The conveyor 1, the drive motor 20, the heater 21 and the electric pusher 28 are all common standard parts or parts known to those skilled in the art, and the structure and principle thereof are known to those skilled in the art through technical manuals or through routine experimentation, and thus will not be described herein too much.

While there have been shown and described what are at present considered to be the fundamental principles of the utility model, its essential features and advantages, it will be understood by those skilled in the art that the utility model is not limited by the embodiments described above, which are merely illustrative of the principles of the utility model, but that various changes and modifications may be made therein without departing from the spirit and scope of the utility model, which is to be accorded the full scope of the utility model as hereinafter claimed.

Claims

1. The utility model provides a headspace sampling device for screening of volatile organic compounds, includes feeding corridor (2), sampling case (3) and ejection of compact corridor (4), its characterized in that: the feeding gallery (2) is fixedly arranged on the left side of the sampling box (3), the discharging gallery (4) is fixedly arranged on the right side of the sampling box (3), a conveying device (1) penetrates through the feeding gallery (2), the sampling box (3) and the discharging gallery (4), a rotating shaft (17) is arranged in the sampling box (3) and behind the conveying device (1) through a bearing, a rotary table (7) is fixedly arranged at the upper end of the rotating shaft (17), the front side of the rotary table (7) is positioned above the conveying device (1), clamping grooves (8) are uniformly formed in the edge of the rotary disc (7), a check ring (9) is fixedly arranged on the inner bottom surface of the sampling box (3) corresponding to the edge of the rotary disc (7), a heating groove (6) is formed in the inner bottom surface of the sampling box (3) corresponding to the clamping groove (8) on the rear side of the turntable (7); a supporting plate (5) is fixedly arranged at the rear side of the retainer ring (9) corresponding to the heating groove (6), a sampling platform (12) is fixedly arranged on the supporting plate (5) corresponding to the upper part of the heating groove (6), the sampling platform (12) is provided with a movable hole (15) corresponding to the center of the heating groove (6), a sampling hole (14) is arranged below the movable hole (15), a sampling needle (16) is inserted in the movable hole (15), a return spring (13) is arranged below the sampling needle (16), the lower end of the return spring (13) is fixedly connected with the bottom of the movable hole (15), the lower end of the sampling needle (16) corresponds to the sampling hole (14), the upper end of the supporting plate (5) is fixedly provided with a vertical cylinder (11), a pressing block (10) is fixedly mounted at the lower end of the air cylinder (11), and the pressing block (10) is aligned with the sampling needle (16) in the vertical direction; a carrier gas inlet pipe (24) is hermetically connected to the left side of the sampling needle (16), a carrier gas outlet pipe (26) is hermetically connected to the right side of the sampling needle (16), and movable grooves (25) are respectively formed in the side surfaces of the left side and the right side of the sampling platform (12) corresponding to the carrier gas inlet pipe (24) and the carrier gas outlet pipe (26); a heat conducting cup (23) is fixedly arranged in the bottom of the sampling box (3) corresponding to the heating groove (6), a water tank (22) is arranged below the heat conducting cup (23), a heater (21) is fixedly arranged at the bottom of the water tank (22), a supporting plate (30) is movably arranged in the heat conducting cup (23), a mandril (29) is fixedly arranged in the middle of the lower surface of the supporting plate (30), a jacking chamber (27) is arranged below the water tank (22), an electric push rod (28) is fixedly arranged in the jacking chamber (27), and the lower end of the mandril (29) extends into the jacking chamber (27) and is fixedly connected with the moving end of the electric push rod (28); pivot (17) lower extreme extends to in sampling case (3) end, correspond in sampling case (3) end pivot (17) lower extreme is provided with drive chamber (19), fixed mounting has driving motor (20) in drive chamber (19), the output of driving motor (20) with pivot (17) fixed connection.

2. The headspace sampling device for volatile organic compound screening according to claim 1, wherein: and the carrier gas inlet pipe (24) and the carrier gas outlet pipe (26) are respectively provided with a one-way valve in a sealing way.

3. The headspace sampling device for volatile organic compound screening according to claim 1, wherein: conveyer (1) is including conveying motor, area roller, conveyer belt and baffle, it installs through the bearing respectively to take the roller feeding gallery (2) with on ejection of compact gallery (4), the conveyer belt winding is in take the roller on, conveying motor drives through mechanical connection and takes the roller to rotate, the conveyer belt upper surface with sample case (3) inside bottom surface is flat mutually, sample case (3) bottom surface corresponds conveyer belt border fixed mounting has the baffle that is used for restricting the skew of headspace sample bottle.