CN204008238U - A kind of gas collector - Google Patents

Abstract

The utility model relates to the technical field of plant tissue measurement, in particular to a gas collection device. The gas collection device includes a vacuum bag, a sealing cover and a suction device, the vacuum bag is provided with a space for containing plant tissue, a sealing cover is installed on one end of the vacuum bag, and the sealing cover is provided with The sealing end of the vacuum bag is connected, and the suction device is installed on the sealing cover for vacuuming the vacuum bag; when using gas chromatography to quantitatively analyze the gas compounds released by plant tissues, using the gas collection device can be convenient and quick The gas sample released by any plant tissue can be collected accurately, the empty volume in the vacuum bag can be quantified at will, and the device always maintains good airtightness during the process of sampling and collecting gas samples, and a single sample can be used for collection and measurement the goal of.

Description

A gas collection device

technical field

The utility model relates to the technical field of plant tissue measurement, in particular to a gas collection device for gas chromatography.

Background technique

At present, when using gas chromatography to quantitatively analyze the gas compounds released by plant tissues, it is necessary to collect the mixed gas samples that the plants prevent from releasing, and then inject the gas samples into the gas chromatograph to determine the content of specific compounds.

The general method of collecting gas samples is to put plant tissue into a fixed-volume glass airtight container, as shown in Figure 1, the glass container 4 is sealed with a rubber stopper, and two glass tubes 5 are punched and inserted into the rubber stopper. , The glass tubes 5 are communicated with rubber tubes 6 . When sampling, use a micro-sampler to insert a certain volume of gas sample into the rubber tube 6 for gas chromatographic analysis.

However, this traditional method of collecting gas samples has four disadvantages:

First, when performing quantitative analysis, it is necessary to measure the empty volume in the vessel by the drainage method, which is cumbersome to operate and easily causes errors;

Second, the container itself is heavy, difficult to carry, and inconvenient to carry;

Third, when collecting gas samples for measurement, the plant tissue cannot be damaged, and the empty volume in the vessel is determined by the tissue gap, so when the measured tissue gap is large and the released compound content is small, it is very difficult It is difficult to collect enough compounds for analysis and determination;

Fourth, for some tissues, it is necessary to use multiple tissue samples for collecting gas samples, resulting in waste of samples.

Therefore, in view of the above deficiencies, there is a need for a gas collection device that can conveniently and quickly collect gas samples released by any plant tissue, can freely quantify the empty volume in the closed device, and can complete the collection and measurement by using a single sample.

Utility model content

(1) Technical problems to be solved

The technical problem to be solved by the utility model is to provide a gas collection device, so that the gas sample released by any plant tissue can be collected conveniently and quickly, and the free volume in the closed device can be quantified at will, and can be realized by using a single sample Collect assays.

(2) Technical solutions

In order to solve the above technical problems, the utility model provides a gas collection device, the gas collection device includes a vacuum bag, a sealing cover and a suction device, the vacuum bag is provided with a space for accommodating plant tissue, and the vacuum bag A sealing cover is installed on one end of the sealing cover, and a sealing end communicating with the vacuum bag is arranged on the sealing cover, and the suction device is installed on the sealing cover, and is used for vacuumizing the vacuum bag.

Wherein, the sealing cover includes a cover body, a connecting tube, and a glue head, and the cover body is sealed and installed at the interface of the vacuum bag. One end of the connecting tube passes through the cover body and communicates with the vacuum bag, and the other end is sealed and connected to the vacuum bag. There are glue heads.

Wherein, the cover body is provided with a through hole, and a rubber plug is sealed and installed on the through hole.

Wherein, the vacuum bag is a soft infusion bag, and the cover is detachably connected to the interface of the soft infusion bag.

Wherein, the suction device is a micro vacuum pump.

Wherein, a syringe is also included, and the injection end of the syringe is inserted into the sealing end for quantitatively inputting gas into the vacuum bag.

Wherein, a micro-sampler is also included, and the sampling end of the micro-sampler is inserted into the sealing end for collecting gas samples in the vacuum bag.

(3) Beneficial effects

The above-mentioned technical scheme of the utility model has the following beneficial effects: the vacuum bag of the gas collection device of the utility model is provided with a space for accommodating plant tissues, and a sealing cover is installed on one end of the vacuum bag, and the sealing cover is provided with the vacuum bag. The connected sealing end can input quantitative gas into the vacuum bag through the sealing end, and the suction device is installed on the sealing cover to vacuumize the vacuum bag; when using gas chromatography to quantitatively analyze the gas compounds released by plant tissues, The gas collection device can be used to collect gas samples released by any plant tissue conveniently and quickly, and the empty volume in the vacuum bag can be quantified at will, and the device always maintains good airtightness during the process of sampling and collecting gas samples, which can A single sample can be used for collection and measurement purposes.

Description of drawings

Fig. 1 is the structural representation of prior art figure collecting gas sample;

Fig. 2 is a schematic structural view of the gas collection device of the present invention.

Among them, 1: vacuum bag; 2: sealing cap; 3: suction device; 4: glassware; 5: glass tube; 6: rubber tube; 21: rubber plug; 22: connecting tube; 23: rubber head; 24: through hole.

Detailed ways

The implementation of the present utility model will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the utility model, but cannot be used to limit the scope of the utility model.

In the description of the present utility model, unless otherwise specified, the meaning of "multiple" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer" ", "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the present invention. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that unless otherwise specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, or Integratively connected; it can be mechanically or electrically connected; it can be directly connected or indirectly connected through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

As shown in Figure 2, the gas collection device of the present embodiment comprises a vacuum bag 1, a sealing cover 2 and a suction device 3, the vacuum bag 1 is provided with a space for accommodating plant tissue, and one end of the vacuum bag 1 is sealed with a sealing cover 2. The sealing cover 2 is provided with a sealing end connected with the vacuum bag 1, through which the gas can be quantitatively input into the vacuum bag 1, and the suction device 3 is installed on the sealing cover 2 for vacuumizing the vacuum bag 1 .

When gas chromatography is used in the laboratory to quantitatively analyze gas compounds (such as ethylene) released by plant tissues, the gas collection device can be used to collect gas samples released by any plant tissues conveniently and quickly. Moreover, the gas collection device always maintains good airtightness during the process of sampling and collecting gas samples, and a single sample can be used to achieve the purpose of collection and measurement.

The vacuum bag 1 therein can be a transparent and airtight transfusion soft bag, and the transfusion soft bag not only has good airtightness, but also takes materials conveniently.

In addition, the vacuum bag 1 can also be other vacuumable sealing devices, such as: sealing film, sealed plastic bag, and the size of the vacuum bag 1 can be adjusted adaptively according to the shape and size of the plant tissue.

In this embodiment, the vacuum bag 1 preferably uses a soft infusion bag, and a sealing cover 2 is sealed and installed at the interface of the infusion soft bag.

The sealing cap 2 is provided with a sealing end, and the sealing end ensures that there will be no gas leakage during gas injection and sampling.

In order to achieve this purpose, the sealing cap 2 is provided with a through hole 24, and a rubber plug 21 is sealed and installed on the through hole 24. The through hole 24 and the rubber plug 21 are combined to form a sealing end, and a syringe can be used to insert the rubber plug 21 to the infusion soft bag. A fixed volume of gas is injected inside for quantitative sealing.

In order to achieve the purpose of saving raw materials, the sealing cover 2 can directly use the plastic cover on the infusion soft bag, specifically: the sealing cover 2 includes a cover body, a connecting tube 22, and a rubber head 23. Under the premise of ensuring airtightness, the cover body The interface with the vacuum bag 1 is detachably connected, such as threaded connection, sleeve connection, card connection, etc., for the purpose of easy disassembly and replacement. The connecting pipe 22 is pierced on the cover body, one end of which communicates with the vacuum bag 1 , and the other end is sealed and connected with a glue head 23 to ensure the airtightness of the vacuum bag 1 . In actual application, the connecting tube 22 can be a centrifuge tube after opening, and a 1.5ml or 2ml centrifuge tube can be selected.

The cover body is provided with a through hole 24, and a sealing plug is installed on the through hole 24. The through hole and the sealing plug form a sealing end. Of course, the connecting pipe 22 can also be used as a sealing end, and a valve or a sealing body is installed on the connecting pipe 22. , can also be used for gas input and sampling.

It is worth noting that the form of the sealing cap 2 is not limited to a specific structure, and any device that can be sealed and connected with the vacuum bag 1 is within the scope of protection of this embodiment.

This embodiment is easy to manufacture. Take the infusion soft bag as an example: cut the head of the infusion soft bag, select a 1.5ml or 2ml centrifuge tube, and after the centrifuge tube is opened, one end of the centrifuge tube will pass through the plastic cover and communicate with the infusion soft bag. One end is sealed by the rubber head 23, and the production can be completed. Before use, you can put the infusion soft bag into the air seal and put it in water to check whether there is air leakage. Correspondingly, in order to further ensure airtightness when collecting gas samples, glycerin can be applied to the sealed end, clamped with a clip and placed in water.

The suction device 3 of the gas collection device can be a miniature vacuum pump. The miniature vacuum pump is installed on the sealing cover 2 and can be controlled by buttons. A miniature vacuum pump is connected to the sealing cover 2, and the vacuum bag 1 can be continuously pumped by the microvacuum pump, forming a pressure difference between the suction port and the outside atmosphere, and under the action of the pressure difference, the gas is sucked into the pump chamber, and then from The exhaust port is discharged to realize vacuuming the vacuum bag 1 . The micro vacuum pump will not pollute the working medium, and has the advantages of small size, low noise, and maintenance-free.

It is worth noting that the suction device 3 is used as a device for vacuuming, and it can also be of other structures, such as: a dual-purpose suction device for air suction and inflation formed through technical improvement, the suction device can be installed on the sealing cover 2, or can be used Connected externally on the through hole 24, adopt electric or manual all can.

In addition, the gas collection device also includes a syringe, and the injection end of the syringe is inserted into the sealing end (rubber stopper 21), and is used for quantitatively inputting gas into the vacuum bag 1, so as to realize the free volume in the vacuum bag 1 at will. The input gas is usually For the air, provide the measurement environment for the plant tissue.

At the same time, the gas collection device also includes a micro-sampler, which is inserted into the sealing end (rubber plug 21 ) through the micro-sampler to collect the gas sample in the vacuum bag 1 during gas chromatography analysis.

The specific measurement process of the gas collection device: in the first step, weigh M the plant tissue (need to carry out specific release compound analysis) to collect the gas sample; in the second step, place the weighed plant tissue in the vacuum bag 1, and then Sealing; the third step is to vacuumize the vacuum bag 1 through the suction device 3; the fourth step is to inject a fixed volume of gas V ₁ with a syringe, and use a micro-sampler to insert a rubber plug 21 to sample a certain volume V within a certain period of time T _2. It can be used for gas chromatography determination and analysis. Assuming that the measured gas sample concentration is Q, the measured amount of the compound released by the plant tissue is Q·V ₁ /(M·T·V ₂ ).

In summary, the vacuum bag of the gas collection device of the present utility model is provided with a space for accommodating plant tissues, and a sealing cover is installed on one end of the vacuum bag. The end can input quantitative gas into the vacuum bag, and the suction device is installed on the sealing cover to vacuumize the vacuum bag; when using gas chromatography to quantitatively analyze the gas compounds released by plant tissues, the use of this gas collection device can be convenient Quickly collect gas samples released by any plant tissue, which can be used to quantify the empty volume in the vacuum bag at will, and the device always maintains good airtightness during sampling and gas sample collection, and can be collected with a single sample purpose of the determination.

The embodiments of the invention have been presented for purposes of illustration and description, but are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and changes will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to better explain the principle and practical application of the invention, and to enable those of ordinary skill in the art to understand the invention and design various embodiments with various modifications suitable for particular purposes.

Claims (7)

1. a gas collection device, is characterized in that, comprises vacuum bag (1), sealing cover (2) and suction device (3), is provided with the space for holding plant tissue in described vacuum bag (1), in One end of the vacuum bag (1) is sealed with a sealing cover (2), the sealing cover (2) is provided with a sealing end communicating with the vacuum bag (1), and the suction device (3) is installed on the sealing On the cover (2), it is used to vacuumize the vacuum bag (1). 2. The gas collection device according to claim 1, characterized in that, the sealing cover (2) comprises a cover body, a connecting pipe (22), and a glue head (23), and the cover body is sealed and installed on the vacuum At the interface of the bag (1), one end of the connecting pipe (22) passes through the cover and communicates with the vacuum bag (1), and the other end is sealed and connected with a rubber head (23). 3. The gas collection device according to claim 2, characterized in that, the cover body is provided with a through hole (24), and a rubber plug (21) is sealed and mounted on the through hole (24). 4. The gas collection device according to claim 3, characterized in that the vacuum bag (1) is a soft infusion bag, and the cover is detachably connected to the interface of the soft infusion bag. 5. The gas collection device according to claim 4, characterized in that the suction device (3) is a micro vacuum pump. 6. The gas collection device according to any one of claims 1-5, further comprising a syringe, the injection end of which is inserted into the sealing end for injecting into the vacuum bag (1) Quantitative input gas. 7. The gas collection device according to any one of claims 1-5, further comprising a microsampler, the sampling end of the microsampler is inserted into the sealing end for collecting the Gas sample in vacuum bag (1).