Oscillation type headspace balance gas sampling device

Abstract

The utility model discloses an oscillating type headspace balance gas sampling device, which relates to the technical field of gas detection and comprises a quantitative airtight injection device, a four-way two-position valve, an oscillating device, a gas quantifying device, a vacuum pump, a digital pump, a three-way electromagnetic valve and a headspace balancer, a port a of the four-way two-position valve is connected with a quantitative airtight injection device; the quantitative airtight injection device is connected with a digital pump; a port b of the four-way two-position valve is connected with a port A of a three-way solenoid valve, a port B of the three-way solenoid valve is connected with a first exhaust port, a port C of the three-way solenoid valve is connected with a vacuum pump, and the vacuum pump is connected with a second exhaust port; a port c of the four-way two-position valve is connected with a gas quantifying device; the gas quantifying device is connected with a gas inlet; a port d of the four-way two-position valve is connected with a headspace balancer; the oscillation device is installed at the lower end of the headspace balancer. According to the utility model, efficient and accurate sample injection of a gas sample can be realized, and the precision and accuracy of measured data are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas detection technical field, in particular to a kind of oscillation type headspace balanced gas sampling device. BACKGROUND

[0002] When gas phase analysis, many samples cannot be directly sampled, need to be indirectly sampled after pretreatment, headspace sampling belongs to this pretreatment method, gas extraction sample components are used in headspace sampling, compared with traditional solid-liquid extraction and liquid-liquid extraction etc., experimental cost is lower, interference factor is smaller, so it is widely applied in gas analysis.

[0003] Headspace sampler is the sampling equipment for determining the content of these components in original sample by gas composition above sample matrix, which is an indirect determination method, and its basic theoretical basis is: under certain conditions, there is distribution equilibrium between gas phase and condensed phase (liquid phase or solid phase). Analysis principle is: sample is placed in a closed container, and is placed at a certain temperature for a period of time to make gas-liquid two phases reach equilibrium, and gas phase part is taken into gas chromatograph for analysis. Based on the principle, we propose an oscillation type headspace balanced gas sampling device to realize efficient and accurate sampling of gas sample. SUMMARY

[0004] The utility model discloses a kind of oscillation type headspace balanced gas sampling device, to solve the problems existing in the prior art described above, can realize efficient and accurate sampling of gas sample, improve the precision and accuracy of measured data.

[0005] To achieve the above object, the utility model provides the following scheme:

[0006] The utility model provides a kind of oscillation type headspace balanced gas sampling device, including quantitative airtight injection device, four-way double-position valve, oscillation device, gas quantitative device, vacuum pump, digital pump, three-way electromagnetic valve and headspace balancer;

[0007] The four-way double-position valve is in first state, and its a port and b port are communicated, and c port and d port are communicated, and the four-way double-position valve is in second state, and its a port and d port are communicated, and b port and c port are communicated;

[0008] The three-way electromagnetic valve is in first state, and its A port and C port are communicated, and the three-way electromagnetic valve is in second state, and its A port and B port are communicated;

[0009] The a port of the four-way double-position valve is connected by pipeline with the quantitative airtight injection device, and the quantitative airtight injection device is connected by pipeline with the digital pump;

[0010] The b port of the four-way two-position valve is connected with the A port of the three-way electromagnetic valve through a pipeline, the B port of the three-way electromagnetic valve is connected with a first exhaust port through a pipeline, the C port of the three-way electromagnetic valve is connected with the vacuum pump through a pipeline, and the vacuum pump is connected with a second exhaust port;

[0011] The c port of the four-way two-position valve is connected with the gas quantifying device through a pipeline, and the gas quantifying device is connected with an air inlet through a pipeline;

[0012] The d port of the four-way two-position valve is connected with the headspace balancer through a pipeline;

[0013] The oscillation device is installed at the lower end of the headspace balancer.

[0014] In an embodiment, the oscillation device is electrically connected with a numerical control device.

[0015] In an embodiment, a drying tube is arranged on the pipeline connecting the d port of the four-way two-position valve with the headspace balancer.

[0016] In an embodiment, a pressure gauge is arranged on the pipeline connecting the C port of the three-way electromagnetic valve with the vacuum pump.

[0017] In an embodiment, a rotameter is arranged on the pipeline connecting the B port of the three-way electromagnetic valve with the first exhaust port.

[0018] In an embodiment, a light shield is arranged outside the headspace balancer.

[0019] In an embodiment, a temperature sensor is arranged in the headspace balancer.

[0020] In an embodiment, a box body is further included, and the quantitative air-tight injection device, the four-way two-position valve, the oscillation device, the gas quantifying device, the vacuum pump, the digital pump and the three-way electromagnetic valve are all loaded in the box body.

[0021] The utility model discloses the following technical effects are obtained relative to the prior art:

[0022] The oscillation type headspace balance gas sampling device provided by the utility model, the four-way two-position valve can inject high-purity nitrogen from the gas inlet through the gas quantitative device and the c port and the d port of the four-way two-position valve to the headspace balancer in the first state, and carries out gas-liquid balance treatment process through the oscillation device, greatly reduces the headspace balance time of the sample through the oscillation device; the three-way electromagnetic valve can inject the balance gas, which is temporarily stored in the quantitative airtight injection device after the last headspace treatment, into the gas circuit through the digital pump in the first state, passes through the a port and the b port of the four-way two-position valve, and makes the headspace balance gas enter the gas detection device for gas detection from the second gas outlet; the four-way two-position valve can draw the balance gas in the headspace balancer into the quantitative airtight injection device through the d port and the a port of the four-way two-position valve through the digital pump in the second state; the three-way electromagnetic valve can draw the gas circuit between the C port of the three-way electromagnetic valve and the vacuum pump to negative pressure through the vacuum pump in the second state, guarantees the accurate measurement of the next sampling gas, and makes the high-purity nitrogen pass through the gas quantitative device and the c port and the b port of the four-way two-position valve from the gas inlet, passes through the A port and the B port of the three-way electromagnetic valve, makes the headspace balance gas discharge from the first gas outlet, and completes the gas circuit flushing, so as to guarantee the accuracy of the sampling process; thus, the efficient and accurate sampling of the gas sample is realized, and the precision and accuracy of the measurement data are improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating labor.

[0024] Fig. 1 It is the structure schematic diagram of the oscillation type headspace balance gas sampling device in the embodiments of the utility model;

[0025] Fig. 2 It is the schematic diagram when the oscillation type headspace balance gas sampling device in the embodiments of the utility model is in gas-liquid balance treatment / balance gas sampling state;

[0026] Fig. 3 It is the schematic diagram when the oscillation type headspace balance gas sampling device in the embodiments of the utility model is in extraction balance gas / washing gas pipeline state.

[0027] In the drawing: 1-quantitative airtight injection device, 2-four-way two-position valve, 3-oscillation device, 4-gas quantitative device, 5-vacuum pump, 6-digital pump, 7-three-way electromagnetic valve, 8-headspace balancer, 9-dry tube, 10-pressure gauge, 11-rotary flowmeter, 12-shading cover, 13-temperature sensor, 14-box. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be apparently and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0029] The utility model discloses a kind of oscillation headspace balanced gas sampling devices, to solve the problems existing in prior art, can realize the efficient accurate sampling of gas sample, improve the precision and accuracy of measurement data.

[0030] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0031] As Figs. 1-3 The utility model discloses a kind of oscillation headspace balanced gas sampling devices, including quantitative airtight injection device 1, four-way two-position valve 2, oscillation device 3, gas quantitative device 4, vacuum pump 5, digital pump 6, three-way electromagnetic valve 7 and headspace balancer 8;

[0032] Four-way two-position valve 2 in first state, its a mouth and b mouth are communicated, c mouth and d mouth are communicated, four-way two-position valve 2 in second state, its a mouth and d mouth are communicated, b mouth and c mouth are communicated;

[0033] Three-way electromagnetic valve 7 in first state, its A mouth and C mouth are communicated, three-way electromagnetic valve 7 in second state, its A mouth and B mouth are communicated;

[0034] The a mouth of four-way two-position valve 2 is connected with quantitative airtight injection device 1 by pipeline, and quantitative airtight injection device 1 is connected with digital pump 6 by pipeline;

[0035] The b mouth of four-way two-position valve 2 is connected with the A mouth of three-way electromagnetic valve 7 by pipeline, the B mouth of three-way electromagnetic valve 7 is connected with first exhaust port out 1 by pipeline, the C mouth of three-way electromagnetic valve 7 is connected with vacuum pump 5 by pipeline, and vacuum pump 5 is connected with second exhaust port out 2;

[0036] The c mouth of four-way two-position valve 2 is connected with gas quantitative device 4 by pipeline, and gas quantitative device 4 is connected with inlet in by pipeline;

[0037] The d mouth of four-way two-position valve 2 is connected with headspace balancer 8 by pipeline;

[0038] Oscillation device 3 is installed in the lower end of headspace balancer 8.

[0039] In this embodiment, seawater sample is taken as an example to illustrate the determination of dissolved carbon monoxide in seawater by the device.

[0040] In the embodiment, the quantitative gas injection device 1 can be a Luer lock quantitative gas syringe, the oscillation device 3 can be a vortex oscillator, and the gas quantification device 4 can be a quantitative ring. The oscillation device 3 is electrically connected to the numerical control device, and the oscillation time, standing time and oscillation frequency can be customized through the numerical control device to realize automatic control of oscillation. The gas quantification device 4 can quantitatively inject high-purity nitrogen into the sample. The digital pump 6 extracts or injects the headspace equilibrium gas from the headspace equilibrator 8 or into the gas circuit at a set time through the quantitative gas injection device 1 to ensure high-precision sample injection repeatability. The four-way two-position valve 2 switches to the first state or the second state according to the set program, and the four-way two-position valve 2 changes the gas circuit flow direction by switching the state. The residual gas in the four-way two-position valve 2 before switching can be isolated after switching and will not affect the gas in the gas circuit after switching. The vacuum pump 5 is used to extract the gas in the gas circuit. Generally, the amount of headspace equilibrium gas is low. To reduce the influence of the dead volume of the gas circuit, the sample injection gas circuit is pumped to negative pressure by the vacuum pump 5 before the headspace equilibrium gas is injected. The three-way electromagnetic valve 7 switches to the first state or the second state according to the set program. When the A port and the C port are connected, it is used for vacuum extraction of the gas circuit to complete the sample injection step. When the A port and the B port are connected, it is used for sample flushing program. The quantitative gas injection device 1 is a bidirectional injection device controlled by the digital pump 6, which is used to extract and temporarily store the headspace equilibrium gas. After the gas circuit is pumped to negative pressure by the vacuum pump 5, the headspace equilibrium gas is discharged into the gas circuit, which can ensure the repeatability and accuracy of the sample injection.

[0041] In the embodiment, a drying tube 9 is arranged on the pipeline connecting the d port of the four-way two-position valve 2 and the headspace equilibrator 8, which is used to absorb water vapor in the equilibrium gas.

[0042] In the embodiment, a pressure gauge 10 is arranged on the pipeline connecting the C port of the three-way electromagnetic valve 7 and the vacuum pump 5, which is used to display the internal gas pressure of the gas circuit in real time.

[0043] In the embodiment, a rotameter 11 is arranged on the pipeline connecting the B port of the three-way electromagnetic valve 7 and the first exhaust port out1, which is used to detect the gas flow.

[0044] In the embodiment, a light shield 12 is arranged outside the headspace equilibrator 8, which is used to eliminate the influence of photochemical generation of carbon monoxide in the device during the headspace equilibrium process.

[0045] In the embodiment, a temperature sensor 13 is arranged in the headspace equilibrator 8, which is used to measure the temperature of the sample in the headspace equilibrator 8.

[0046] In this embodiment, the box 14 is also included, the quantitative airtight injection device 1, the four-way two-position valve 2, the oscillation device 3, the gas quantitative device 4, the vacuum pump 5, the digital pump 6 and the three-way electromagnetic valve 7 are all loaded in the box 14. The box 14 provides an integrated fixed carrier for other functional components in the device, facilitates connection and layout with measuring instruments, and provides portable conditions for laboratory and voyage or field experiments.

[0047] As shown in Fig. 2 , the device is in the gas-liquid equilibrium treatment / equilibrium gas sampling state:

[0048] The four-way two-position valve 2 is switched to the first state, the a port and the b port are communicated, the c port and the d port are communicated, the high-purity nitrogen gas enters the c port of the four-way two-position valve 2 from the gas inlet in through the gas quantitative device 4, then enters the headspace equilibrator 8 through the d port of the four-way two-position valve 2, and the nitrogen injection is performed, and after the nitrogen injection is completed, the gas-liquid equilibrium treatment process is started according to the program setting through the oscillation device 3; at the same time of the above process, according to the set program, the three-way electromagnetic valve 7 is switched to the state that the A port and the C port are communicated, the digital pump 6 is started, and the vacuum pump 5 stops running, the equilibrium gas temporarily stored in the quantitative airtight injection device 1 after the last headspace treatment is injected into the gas circuit, passes through the a port and the b port of the four-way two-position valve 2, and the headspace equilibrium gas enters the gas detection device from the second gas outlet out 2.

[0049] As shown in Fig. 2 , the device is in the extraction equilibrium gas / flushing gas pipeline state:

[0050] According to the set program, the four-way two-position valve 2 is switched to the second state, the a port and the d port are communicated, the b port and the c port are communicated, the digital pump 6 is started, and the equilibrium gas in the headspace equilibrator 8 is extracted into the quantitative airtight injection device 1 through the drying tube 9, the d port and the a port of the four-way two-position valve 2. At the same time, the three-way electromagnetic valve 7 is switched to the state that the A port and the B port are communicated, the vacuum pump 5 is automatically powered on, the gas circuit between the C port of the three-way electromagnetic valve 7 and the vacuum pump 5 is extracted to negative pressure, and the pressure value is directly displayed by the pressure gauge 10.

[0051] At the same time of the above process, the high-purity nitrogen gas continuously enters the c port of the four-way two-position valve 2 from the gas inlet in through the gas quantitative device 4, then passes through the b port of the four-way two-position valve 2, passes through the A port and the B port of the three-way electromagnetic valve 7, and makes the headspace equilibrium gas flow out from the first gas outlet out 1 through the rotameter 11, and the gas circuit flushing is completed.

[0052] The device can realize automatic operation of the sampling device through the set program, thereby reducing the difficulty of manual operation, improving the repeatability, and further greatly improving the quality and efficiency of data measurement.

[0053] The principle and implementation mode of the utility model are described by applying specific examples, and the above embodiment is only used for helping to understand the method and core idea of the utility model; meanwhile, for the general technical personnel in the field, the specific implementation mode and application range will be changed according to the idea of the utility model. In conclusion, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. An oscillating headspace balance gas sampling device, characterized by: The quantitative air-tight injection device, the four-way two-position valve, the oscillation device, the gas quantitative device, the vacuum pump, the digital pump, the three-way electromagnetic valve and the headspace balancer are included. In the first state, the a port and the b port of the four-way two-position valve are communicated, and the c port and the d port are communicated. In the first state, the A port and the C port of the three-way electromagnetic valve are communicated. The a port of the four-way two-position valve is connected with the quantitative air-tight injection device through a pipeline. The b port of the four-way two-position valve is connected with the A port of the three-way electromagnetic valve through a pipeline. The C port of the three-way electromagnetic valve is connected with the vacuum pump through a pipeline. The c port of the four-way two-position valve is connected with the gas quantitative device through a pipeline. The d port of the four-way two-position valve is connected with the headspace balancer through a pipeline.

2. The oscillating headspace balance gas sampling device of claim 1, wherein: The oscillation device is installed at the lower end of the headspace balancer.

3. The oscillating headspace balance gas sampling device of claim 1, wherein: The oscillation device is electrically connected with the numerical control device.

4. The oscillating headspace balance gas sampling device of claim 1, wherein: A drying tube is arranged on the pipeline connecting the d port of the four-way two-position valve and the headspace balancer.

5. The oscillating headspace balance gas sampling device of claim 1, wherein: A pressure gauge is arranged on the pipeline connecting the C port of the three-way electromagnetic valve and the vacuum pump.

6. The oscillating headspace balance gas sampling device of claim 1, wherein: A rotameter is arranged on the pipeline connecting the B port of the three-way electromagnetic valve and the first exhaust port.

7. The oscillating headspace balance gas sampling device of claim 1, wherein: The headspace balancer is externally provided with a light shield.

8. The oscillating headspace balance gas sampling device of claim 1, wherein: A temperature sensor is arranged in the headspace balancer. A box is further included, and the quantitative air-tight injection device, the four-way two-position valve, the oscillation device, the gas quantitative device, the vacuum pump, the digital pump and the three-way electromagnetic valve are loaded in the box.

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