Automatic sampling device for industrial gas sample

Abstract

The utility model discloses an automatic sample injection device for an industrial gas sample, which is characterized in that a three-way electromagnetic valve, a selector valve, a switching valve, a quantitative ring, a sample injection pump and a controller are respectively arranged in a shell, and a sample injection port, a carrier gas inlet and a gas outlet are respectively arranged on the side surface of the shell; a first port of the three-way electromagnetic valve is sequentially connected with the switching valve, the quantitative loop and the sample injection pump, a second port of the three-way electromagnetic valve is sequentially connected with the selection valve and the sample injection port, a third port of the three-way electromagnetic valve is connected with the carrier gas inlet, and the three-way electromagnetic valve is used for switching the first port to be communicated with the second port or the first port to be communicated with the third port; and the controller is electrically connected with the three-way electromagnetic valve, the selection valve, the switching valve and the sample injection pump respectively. The device overcomes the defects of the traditional industrial gas sample injection operation, does not need to manually extrude an air bag, avoids cross contamination among samples, realizes full-automatic sample injection, has a cleaning function, and realizes more accurate gas sample detection and analysis.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental monitoring, in particular to an automatic sampling device for industrial gas samples. Background Art

[0002] Typically, the instrument used for laboratory industrial gas composition analysis is a gas chromatograph. This instrument requires manual squeezing of an aluminum foil gas bag to achieve sampling, which is time-consuming and laborious. Furthermore, since there are impurity gases in the connecting pipe between the gas bag and the instrument, cross-contamination of the sample may occur. Therefore, the impurity gases need to be exhausted before each sampling. This requires the human eye to observe whether the instrument's sampling indicator has exhausted all the bubbles. Different monitors use different squeezing techniques and visually observe different results to determine whether the bubbles have been exhausted, which can cause certain deviations in the test results. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide an automatic sampling device for industrial gas samples. The device overcomes the defects of traditional industrial gas sample sampling operation, does not require manual squeezing of air bags, avoids cross contamination between samples, realizes fully automatic sampling, and has its own cleaning function, thereby achieving more accurate gas sample detection and analysis.

[0004] In order to solve the above technical problems, the utility model provides an automatic sampling device for industrial gas samples, including a shell, a three-way solenoid valve, a selection valve, a switching valve, a quantitative ring, a sampling pump, a sampling port, a carrier gas inlet, an air outlet and a controller. The three-way solenoid valve, the selection valve, the switching valve, the quantitative ring, the sampling pump and the controller are respectively arranged in the shell, and the sampling port, the carrier gas inlet and the air outlet are respectively arranged on the side of the shell; the first port of the three-way solenoid valve is connected to the switching valve, the quantitative ring and the sampling pump in sequence, the second port is connected to the selection valve and the sampling port in sequence, and the third port is connected to the carrier gas inlet. The three-way solenoid valve switches the first port to be connected to the second port or the first port to be connected to the third port respectively, and the controller is electrically connected to the three-way solenoid valve, the selection valve, the switching valve and the sampling pump respectively.

[0005] Furthermore, the injection port is a matrix injection port, the selection valve is a multi-channel selection valve, and each input port of the multi-channel selection valve is respectively connected to each injection port of the matrix injection port.

[0006] Furthermore, the switching valve realizes the injection preparation working mode, injection mode and cleaning mode of the gas circuit system.

[0007] Furthermore, the controller is communicatively connected to an external gas chromatograph.

[0008] Furthermore, the selection valve, switching valve, quantitative loop, injection port, carrier gas inlet and outlet, and connecting pipelines are all inertized devices.

[0009] Since the automatic sampling device for industrial gas samples of the present invention adopts the above-mentioned technical solution, namely, the three-way solenoid valve, selection valve, switching valve, quantitative ring, sampling pump and controller of the device are respectively arranged in the shell, and the sampling port, carrier gas inlet and gas outlet are respectively arranged on the side of the shell; the first port of the three-way solenoid valve is connected to the switching valve, quantitative ring and sampling pump in sequence, the second port is connected to the selection valve and sampling port in sequence, and the third port is connected to the carrier gas inlet, the three-way solenoid valve switches the first port to be connected to the second port or the first port to be connected to the third port respectively, and the controller is electrically connected to the three-way solenoid valve, selection valve, switching valve and sampling pump respectively. This device overcomes the defects of traditional industrial gas sample sampling operation, does not require manual squeezing of the air bag, avoids cross contamination between samples, realizes fully automatic sampling, and has a self-cleaning function, achieving more accurate gas sample detection and analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0011] Figure 1 This is a schematic diagram of the automatic sampling device for industrial gas samples of the utility model. DETAILED DESCRIPTION

[0012] Implementation example Figure 1 As shown, the automatic sampling device for industrial gas samples of the present invention includes a shell 1, a three-way solenoid valve 2, a selection valve 3, a switching valve 4, a quantitative ring 5, a sampling pump 6, a sampling port 7, a carrier gas inlet 8, an air outlet 9 and a controller 10. The three-way solenoid valve 2, the selection valve 3, the switching valve 4, the quantitative ring 5, the sampling 6 and the controller 10 are respectively arranged in the shell 1, and the sampling port 7, the carrier gas inlet 8 and the air outlet 9 are respectively arranged on the side of the shell 1; the first port of the three-way solenoid valve 2 is connected to the switching valve 4, the quantitative ring 5 and the sampling pump 6 in sequence, the second port is connected to the selection valve 3 and the sampling port 7 in sequence, and the third port is connected to the carrier gas inlet 8. The three-way solenoid valve 2 switches the first port to be connected to the second port or the first port to be connected to the third port, and the controller 10 is electrically connected to the three-way solenoid valve 2, the selection valve 3, the switching valve 4 and the sampling pump 6 respectively.

[0013] Preferably, the injection port 7 is a matrix injection port, the selection valve 3 is a multi-channel selection valve, and each input port of the multi-channel selection valve is respectively connected to each injection port of the matrix injection port.

[0014] The multi-channel selector valve can be 4-way, 6-way, 8-way, 10-way, or 14-way, and is compatible with matrix-style inlets. Different channels determine the number of samples that can be connected simultaneously to the device. The controller can control the multi-channel selector valve to switch to a specific channel position to enable the injection of a specific sample. The matrix-style inlet can support the simultaneous connection of multiple samples, and the multi-channel selector valve selects the sample to be drawn from a specific position.

[0015] The switching valve 4 realizes the sampling preparation mode, the sampling mode and the cleaning mode of the gas circuit system.

[0016] Preferably, the controller 10 is in communication with an external gas chromatograph 11. The device can be controlled by an external instrument, or the device can be controlled solely by the controller.

[0017] Preferably, the selector valve 3, switching valve 4, quantitative loop 5, inlet 7, carrier gas inlet 8, gas outlet 9, and connecting pipes are all inertized components. Inertization can reduce organic adsorption on the components, ensuring more accurate gas composition analysis.

[0018] The housing of this device is used to secure all components and connect the sample to an external gas chromatograph. The controller establishes a communication connection with the external gas chromatograph, enabling control of the device using an external instrument or independent control via the controller. The three-way solenoid valve switches the pipeline and has two operating states: in state 1, the passage connecting the selector valve is connected normally, while the passage connecting the carrier gas inlet is closed, enabling connection between the sample gas and the quantitative loop; in state 2, the passage connecting the carrier gas inlet is connected normally, while the passage connecting the selector valve is closed, enabling connection between the sample gas and the external gas chromatograph.

[0019] The carrier gas type at the carrier gas inlet is determined by the external gas chromatograph and can be nitrogen, air, helium, or other gases. When the three-way solenoid valve is in state 1, the carrier gas is directly exhausted; when the three-way solenoid valve is in state 2, the carrier gas can deliver the sample in the quantitative loop to the external gas chromatograph, or it can clean the main pipelines including the quantitative loop. The gas outlet is connected to the external gas chromatograph to achieve mutual communication between the sample and the gas chromatograph; the switching valve can be 6-way, 10-way, or 14-way, etc. Under different channel configurations, this device can achieve simultaneous sampling of different numbers of samples / standard gases.

[0020] The switching valve has two working states:

[0021] In state 1, the switching valve is connected to the quantitative loop, the injection pump and the three-way solenoid valve. When the three-way solenoid valve is also in state 1, the injection pump draws the sample into the quantitative loop, realizing the injection preparation function of the quantitative loop; when the three-way solenoid valve is in state 2, the injection pump draws the carrier gas into the quantitative loop, realizing the cleaning function of the quantitative loop.

[0022] In state 2, the switching valve connects the three-way solenoid valve to the gas outlet. When the three-way solenoid valve is in state 2, the carrier gas transports the sample in the quantitative loop to the gas outlet for detection and analysis by an external gas chromatograph.

[0023] The quantitative loop can be of different sizes according to different requirements. It is responsible for storing and taking a certain amount of sample, and then entering the outlet with the carrier gas. The injection pump draws the sample into the quantitative loop at a fixed flow rate.

[0024] This device uses a selection valve to connect the designated sample to the air inlet line, and then uses the sampling pump to extract the sample in the air bag into the quantitative loop. Accurate sampling is achieved according to the size of the quantitative loop. The switching valve is then used to connect the quantitative loop in series to an external gas chromatograph. The thrust of the carrier gas is used to send the sample in the quantitative loop to the external gas chromatograph for detection and analysis. After the detection and analysis are completed, the switching valve and the three-way solenoid valve are used to send clean carrier gas into the entire analysis pipeline including the quantitative loop for pipeline cleaning to avoid cross contamination between samples. This device is used for gas bag sample injection. It does not require manual squeezing of the air bag, and can achieve fully automatic injection. At the same time, it has its own cleaning function and a fully inert pipeline design, which can achieve more accurate gas sample detection and analysis.

[0025] This device uses a selection valve to achieve automated sequential injection of multiple gas bag samples; it uses a switching valve to realize the injection preparation mode, injection mode, and cleaning mode of the gas system, enhancing the operability of the device. The carrier gas in this device can be used as a sample booster gas, and can also be used to clean the main pipelines including the quantitative loop. There is no need for additional external cleaning gas. The design is simple and reasonable, reducing cross-contamination between samples. At the same time, the fully inert pipeline design reduces the adsorption of organic matter and ensures more accurate gas composition analysis. The quantitative loop injection mode avoids the defects of manually squeezing the gas bag, reduces uncertainty, improves injection stability and repeatability, frees the hands of analysts, and greatly improves work efficiency.

Claims

1. An automatic sampling device for industrial gas samples, characterized by: The invention comprises a shell, a three-way solenoid valve, a selection valve, a switching valve, a quantitative ring, an injection pump, an injection port, a carrier gas inlet, an air outlet and a controller. The three-way solenoid valve, the selection valve, the switching valve, the quantitative ring, the injection pump and the controller are respectively arranged in the shell, and the injection port, the carrier gas inlet and the air outlet are respectively arranged on the side of the shell; the first port of the three-way solenoid valve is sequentially connected to the switching valve, the quantitative ring and the injection pump, the second port is sequentially connected to the selection valve and the injection port, and the third port is connected to the carrier gas inlet; the three-way solenoid valve switches the first port to be connected to the second port or the first port to be connected to the third port respectively, and the controller is electrically connected to the three-way solenoid valve, the selection valve, the switching valve and the injection pump respectively.

2. The automatic sampling device for industrial gas samples according to claim 1, characterized in that: The injection port is a matrix injection port, the selection valve is a multi-channel selection valve, and each input port of the multi-channel selection valve is respectively connected to each injection port of the matrix injection port.

3. The automatic sampling device for industrial gas samples according to claim 1, characterized in that: The switching valve realizes the injection preparation working mode, injection mode and cleaning mode of the gas path system.

4. The automatic sampling device for industrial gas samples according to claim 1 or 2, characterized in that: The controller is communicatively connected to an external gas chromatograph.

5. The automatic sampling device for industrial gas samples according to claim 4, characterized in that: The selection valve, switching valve, quantitative ring, injection port, carrier gas inlet and outlet, and connecting pipelines are all inertized components.

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