CN210803506U

CN210803506U - Improved generation autoinjection device

Info

Publication number: CN210803506U
Application number: CN201921011222.8U
Authority: CN
Inventors: 张辉; 孙松; 田英明; 楼颖明
Original assignee: Shanghai Huachuan Environmental Protection Technology Co ltd
Current assignee: Shanghai Huachuan Environmental Protection Technology Co ltd
Priority date: 2019-06-28
Filing date: 2019-06-28
Publication date: 2020-06-19
Anticipated expiration: 2029-06-28

Abstract

The application discloses improved generation autoinjection device, including binary channels syringe, three-way valve, carrier gas passageway, peristaltic pump and the reagent bottle, the binary channels syringe is inserted the reagent bottle setting to with carrier gas passageway connects, wherein, carrier gas passageway to the reagent bottle lets in gas; the three-way valve is arranged on the carrier gas channel, a bypass of the three-way valve is connected with the peristaltic pump, and the other end of the peristaltic pump is connected with the reagent bottle. This application can make autoinjection device can accomplish the automatic operation of adding of reagent by program, can further reduce the mechanical repetitive action that this kind of needs manual work of adding reagent was done, improves researcher's work efficiency.

Description

Improved generation autoinjection device

Technical Field

The application belongs to the technical field of autoinjection, concretely relates to improved generation autoinjection device.

Background

The determination of the total mercury content in the water body is an important link for researching the environmental mercury pollution rule. The method for measuring the total mercury content in the water body with the lowest detection limit, which is widely adopted at present, is a No. 1631 method established by the United states Environmental Protection Agency (EPA), namely, the method for measuring the mercury in the water body by oxidation-purging trapping-cold atomic fluorescence spectrometry. The method comprises the following basic processes: oxidation of mercury in all waters to Hg with BrCl²⁺With SnCl₂Reduction of Hg²⁺Is Hg⁰The Hg in the water body is blown away by the carrier gas⁰Collecting the Hg by gold tube, heating the gold tube to analyze Hg⁰Detection of Hg by cold atom fluorescence detector⁰. Most laboratories at home and abroad in the early days build manual measuring devices according to the method, however, with the development of technology, the measuring devices are gradually replaced by commercialized online automatic measuring equipment. Nevertheless, these automatic assay devices still present some tedious and time consuming places in some operational details. If the optimization can be performed from the viewpoint of usability, the repeated mechanical labor and the error probability of the experimenters can be greatly reduced, and the experimenters can put more energy on the research objects and the experimental data.

At present, the total mercury analyzers meeting the EPA 1631 method standard in the market adopt two automatic sample feeding modes: 1) in-situ purging gas sample introduction, namely, gas is directly blown in a sealed sample introduction bottle which is not filled with a sample by using a double-channel sample introduction needle, on the other hand, the gas is discharged from the other channel on the side surface of the sample introduction needle at the upper part of the liquid surface, and the purged mercury vapor is also introduced into the instrument and is trapped by a gold tube; 2) and (3) liquid sampling ex-situ purging, namely, blowing air in a sealed sample bottle by using a double-channel sample injection needle, and simultaneously, extruding a sample from the tail end of the sample injection needle by air pressure to be introduced into a gas-liquid separation device arranged in the instrument for purging and trapping.

Although the two automatic sample introduction modes realize the Hg in the water sample⁰For the purpose of separation, however, for the mode 1), the experimental operation still requires manual addition of SnCl to each sample vial₂The reduction agent is added into the reaction kettle,this is still a cumbersome process; for the mode 2) it is possible to transfer a certain amount of SnCl while transferring the sample₂The method is introduced into a built-in gas-liquid separator of the system, but the method is easy to cause cross contamination among samples (the built-in gas-liquid separator has certain memory effect on high-content samples), and meanwhile, the volume of the purging sample cannot be expanded randomly to improve the detection limit, which is equal to the important advantage of discarding the in-situ purging technology.

SUMMERY OF THE UTILITY MODEL

To overcome the above disadvantages or shortcomings of the prior art, an improved automatic sample feeding device is provided.

In order to solve the technical problem, the application is realized by the following technical scheme:

an improved automatic sample introduction device comprises a double-channel sample introduction needle, a three-way valve, a carrier gas channel, a peristaltic pump and a reagent bottle, wherein the double-channel sample introduction needle is inserted into the reagent bottle and is connected with the carrier gas channel, and gas is introduced into the reagent bottle through the carrier gas channel; the three-way valve is arranged on the carrier gas channel, a bypass of the three-way valve is connected with the peristaltic pump, and the other end of the peristaltic pump is connected with the reagent bottle.

Further, foretell improved generation autoinjection device, wherein, binary channels injection needle is provided with inner channel and outside passage, the outside passage sets up the periphery of inner channel, wherein, inner channel's tip disposes the introduction port, dispose the gas vent on the lateral wall of outside passage.

Further, foretell improved generation autoinjection device wherein, still includes a connecting piece, the carrier gas passageway passes through the connecting piece with the inside passage intercommunication setting of binary channels injection needle, still dispose the appearance gas port on the connecting piece.

Further, in the above improved automatic sample introduction device, the sample gas port is communicated with the gas outlet of the external channel.

Further, in the improved automatic sample introduction device, the bypass of the three-way valve is connected with the peristaltic pump through a multi-way joint, and the other end of the peristaltic pump is respectively connected to different reagent bottles through a plurality of hoses, wherein the number of the hoses is the same as that of the reagent bottles.

Further, in the improved automatic sample feeding device, the peristaltic pump is connected with a circuit board on the control unit through a control line.

Further, in the improved automatic sample introduction device, the reagent bottle is hermetically arranged.

Compared with the prior art, the method has the following technical effects:

the application can make the autoinjection device can accomplish the automatic operation of adding of reagent by preface, and this can be applied to the total mercury analytic system of water sample or other sample analytic systems that need carry out the gas-liquid separation operation, can further reduce the mechanical repetitive motion that this kind of needs manual work of adding reagent was done, improves researcher's work efficiency.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

FIG. 1: this application improved generation autoinjection device.

Detailed Description

The conception, specific structure and technical effects of the present application will be further described in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present application.

As shown in fig. 1, the improved automatic sample introduction device of this embodiment includes a dual-channel sample introduction needle 10, a three-way valve 50, a carrier gas channel 20, a peristaltic pump 30, and the reagent bottle 40, where the dual-channel sample introduction needle 10 is inserted into the reagent bottle 40 and connected to the carrier gas channel 20, and the carrier gas channel 20 introduces gas into the reagent bottle 40; the three-way valve 50 is disposed on the carrier gas channel 20, and a bypass of the three-way valve 50 is connected to the peristaltic pump 30, wherein the other end of the peristaltic pump 30 is connected to the reagent bottle 40. The automatic sample injector of the total mercury analyzer further reduces the complexity of the technology in actual operation on the premise of keeping the advantages of the in-situ purging technology.

The two-channel sample injection needle 10 is provided with an inner channel 11 and an outer channel 12, the outer channel 12 is arranged on the periphery of the inner channel 11, wherein the end of the inner channel 11 is provided with a sample injection port 111, and the side wall of the outer channel 12 is provided with an exhaust port 121.

This embodiment still includes a connecting piece 60, carrier gas passageway 20 through connecting piece 60 with the inside passageway 11 intercommunication setting of binary channels injection needle 10, still be configured with sample gas mouth 61 on the connecting piece 60. The sample port 61 is provided to communicate with the exhaust port 121 of the external channel 12.

For the case of adding a plurality of reagents, a plurality of hoses can be added on the peristaltic pump 30 in fig. 1, the right side of the peristaltic pump is respectively connected with different reagent bottles 40, and the left side of the peristaltic pump is converged by a multi-way joint to form a path to be connected with the carrier gas channel 20. That is, the bypass of the three-way valve 50 is connected to the peristaltic pump 30 through a multi-way joint, and the other end of the peristaltic pump 30 is connected to different reagent bottles 40 through a plurality of hoses, wherein the number of the hoses is the same as that of the reagent bottles 40.

In fact, the technical scheme of the application is adopted for other analysis systems which need to add reagents and then carry out purging gas-liquid separation. For the case where a certain reaction time is required after adding the reagent, the software method can be programmed to separate the reagent injection and purging processes, for example, after the reagent is added to the current sample, purging the previous sample to which the reagent has been added and reacted for a certain time.

The peristaltic pump 30 is connected to a circuit board on the control unit via a control line. Wherein, the peristaltic pump 30 can be externally arranged and is controlled by an output signal of an expansion I/O serial port of the total mercury analysis instrument; or the mercury detector is directly arranged in the total mercury analysis instrument and is connected with a circuit board on the control unit through a control line. Then the analysis method in the analysis software is programmed, so that the peristaltic motion can be turned on or off on time, and the aim of adding a quantitative reducing agent to each sample can be fulfilled, therefore, the whole process from adding the reducing agent to purging the sample can be completed under the control of the program.

The reagent bottle 40 is hermetically arranged.

The working principle of this embodiment is as follows (taking the removal of mercury in the liquid as an example):

during each sample injection, the double-channel sample injection needle 10 penetrates the sealing gasket and is inserted into the reagent bottle 40, the peristaltic pump 30 is started for a certain time, and a certain amount of SnCl is extracted from the reagent bottle 40₂Reducing agent is introduced into the carrier gas passage 20, and then the carrier gas opens the SnCl in the carrier gas passage 20₂The reducing agent is carried into the reagent bottle 40 through the internal passage 11, and also starts purging the sample. Since the reagent bottle 40 is hermetically disposed, the purged gas is discharged out of the reagent bottle 40 through the external channel 12 of the two-channel needle 10, and the discharged gas contains the mercury vapor that is reductively purged, and is finally discharged and collected from the sample gas port 61.

The above embodiments are merely to illustrate the technical solutions of the present application and are not limitative, and the present application is described in detail with reference to preferred embodiments. It will be understood by those skilled in the art that various modifications and equivalent arrangements may be made in the present invention without departing from the spirit and scope of the present invention and shall be covered by the appended claims.

Claims

1. An improved automatic sample feeding device is characterized in that,

the device comprises a double-channel sample injection needle, a three-way valve, a carrier gas channel, a peristaltic pump and a reagent bottle, wherein the double-channel sample injection needle is inserted into the reagent bottle and is connected with the carrier gas channel, and gas is introduced into the reagent bottle through the carrier gas channel;

the three-way valve is arranged on the carrier gas channel, a bypass of the three-way valve is connected with the peristaltic pump, and the other end of the peristaltic pump is connected with the reagent bottle.

2. The improved autosampler device of claim 1, wherein said dual channel injector needle is provided with an inner channel and an outer channel, said outer channel is provided at the periphery of said inner channel, wherein the end of said inner channel is configured with an injection port, and the side wall of said outer channel is configured with an exhaust port.

3. The improved automatic sample introduction device according to claim 1 or 2, further comprising a connector, wherein the carrier gas channel is communicated with the internal channel of the two-channel sample introduction needle through the connector, and the connector is further provided with a sample gas port.

4. The improved autosampler device of claim 3, wherein the sample port is in communication with an exhaust port of an external channel.

5. The improved automatic sample feeding device according to claim 1, wherein a bypass of the three-way valve is connected with the peristaltic pump through a multi-way joint, and the other end of the peristaltic pump is respectively connected with different reagent bottles through a plurality of hoses, wherein the number of the hoses is the same as that of the reagent bottles.

6. An improved autosampler device according to claim 1, 2 or 5, wherein said peristaltic pump is connected to a circuit board on the control unit via a control line.

7. An improved autosampler device according to claim 1, 2 or 5, wherein said reagent bottle is hermetically sealed.