Verification and calibration sampling device for trace oxygen analyzer

Abstract

The utility model relates to a verification and calibration sampling device for a trace oxygen analyzer, which relates to the field of gas verification and analysis equipment and comprises a standard substance feeding end and a verification and calibration end, a discharge port of the standard substance feeding end is communicated with a feed port of the verification calibration end through a metering valve; the standard substance feeding ends comprise a zero gas feeding end and at least three standard substance feeding ends which are communicated with each other; the zero gas feeding end is communicated with all the standard substance feeding ends through bypasses; the verification calibration end comprises a first valve and a sampling device outlet end which are sequentially connected through a pipeline; an exhaust branch and a flow monitoring branch are connected to a pipeline between the metering valve and the first valve; the flow monitoring branch is connected with a pipeline between the first valve and the outlet end of the sampling device; and a leak detection branch is arranged between the first valve and the outlet end of the sampling device. The verification and calibration sampling device provided by the utility model can realize quick switching and eliminate air influence, and can judge the fluctuation condition of flow in detection.

Description

Technical Field

[0001] The utility model relates to the field of gas verification and analysis equipment, in particular to a verification and calibration sampling device for a trace oxygen analyzer. Background Art

[0002] Trace oxygen analyzer is mainly used to measure trace oxygen content in chemical, metallurgical, electronic and other industries.

[0003] For example, CN211718245U discloses a trace oxygen analyzer, comprising a chassis shell, the upper panel of which is provided with a handle, the side panel of which is provided with a protective cover, the end face of which is provided with a power button, an air inlet, an exhaust port, a needle valve, a four-way ball valve, a display screen and a float flowmeter, wherein the power button, the air inlet, the exhaust port and the needle valve are arranged in parallel at the lower end of the end face of the chassis shell, the four-way ball valve and the display screen are installed at the upper end of the end face of the chassis shell, and the float flowmeter is installed at the end face frame of the chassis shell; feet are installed at both ends of the bottom of the chassis shell, and anti-slip pads are glued to the bottom surface of the feet, so as to quickly detect the oxygen content in the gas.

[0004] CN215493106U discloses a trace oxygen analyzer, including an analyzer body, a plurality of storage slots are provided at the upper end of the analyzer body, each storage slot is filled with analysis liquid, the upper inner wall of each storage slot is sealed against a sealing plate, a plurality of air extraction cavities are provided on one side wall of the analyzer body, the inner top of each air extraction cavity is connected to the corresponding storage slot through a connecting groove, the inner wall of each air extraction cavity is penetrated with an air inlet groove connected to the outside of the analyzer body, and a pulling device and a plurality of extraction devices are provided inside the analyzer body. In the device, during the reset process of the slide plate, a plurality of push-pull plates will be driven to reset at the same time, so that the extracted gas can be contacted with the analysis liquid to react, so that the oxygen content analysis of multiple gases can be carried out simultaneously, which can effectively reduce the time consumed by multiple measurements and make the analysis of the oxygen content inside the gas more efficient.

[0005] However, the current verification and calibration of trace oxygen analyzers is based on the JJG945-2010 verification procedure for trace oxygen analyzers. The verification procedure for trace oxygen analyzers is applicable to the verification and calibration of trace oxygen analyzers measuring (0-1000) μmol / mol. During the verification and calibration process, there are defects such as low verification efficiency, inability to distinguish flow fluctuations, and poor airtightness of the gas path. Utility Model Content

[0006] In view of the problems existing in the prior art, the purpose of the utility model is to provide a calibration sampling device for a trace oxygen analyzer to solve the defects of low calibration efficiency, inability to distinguish flow fluctuations and poor airtightness of the gas path during the calibration process of the existing calibration sampling device.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] The utility model provides a sampling device for verification and calibration of a trace oxygen analyzer, the sampling device for verification and calibration of a trace oxygen analyzer comprising:

[0009] Standard material feeding end and verification and calibration end;

[0010] The discharge port of the standard material feeding end is connected to the feed port of the calibration end through a metering valve;

[0011] The standard substance feeding end includes a zero-point gas feeding end and at least three standard substance feeding ends which are interconnected;

[0012] The zero gas supply end is connected with all standard substance supply ends through a bypass;

[0013] The verification and calibration end includes a first valve and a sampling device outlet end connected in sequence through a pipeline;

[0014] An exhaust branch and a flow monitoring branch are connected to the pipeline between the metering valve and the first valve;

[0015] The monitoring flow branch is connected to the pipeline between the first valve and the outlet end of the sampling device;

[0016] A leak detection branch is provided between the first valve and the outlet end of the sampling device.

[0017] The utility model provides a verification and calibration sampling device for a trace oxygen analyzer. By configuring and designing various devices in the verification and calibration sampling device, a sampling device that can quickly switch and eliminate air influence and a sampling device that can judge flow fluctuations during the detection process can be achieved.

[0018] As a preferred technical solution of the utility model, the air inlets of the zero-point gas supply end and at least three standard substance supply ends are all equipped with switch valves.

[0019] As a preferred technical solution of the utility model, the bypass includes a second valve, a deoxygenation device and a third valve which are sequentially connected through pipelines.

[0020] As a preferred technical solution of the utility model, the switch valve configured at the zero-point gas supply end is connected to the second valve through a pipeline.

[0021] As a preferred technical solution of the present utility model, the metering valve is connected to the first valve via a pipeline.

[0022] As a preferred technical solution of the utility model, the discharge port of the exhaust branch is provided with a fourth valve and a first flow detection device.

[0023] As a preferred technical solution of the utility model, the monitoring flow branch includes a fifth valve, a second flow detection device and a sixth valve which are sequentially connected through pipelines.

[0024] As a preferred technical solution of the utility model, the sixth valve is connected to a pipeline between the first valve and an outlet end of the sampling device.

[0025] As a preferred technical solution of the utility model, the leak detection branch is sequentially configured with a seventh valve and a pressure gauge.

[0026] As a preferred technical solution of the present utility model, the sixth valve is connected to the seventh valve via a pipeline.

[0027] Compared with the existing technical solutions, the utility model has the following beneficial effects:

[0028] (1) The sampling device provided by the utility model has one end connected to a digital pressure gauge, which is convenient for leak detection of the pipeline at any time when the pipeline is subsequently used for verification and calibration; the digital pressure gauge is connected to the pipeline through a diaphragm valve, and the diaphragm valve can be opened or closed at any time according to the usage.

[0029] (2) The sampling device of the utility model can realize the control of gas flow rate. The calibration regulations stipulate that the flow rate fluctuation during calibration shall not exceed ±10mL / min. The resolution of the selected mass flow meter is 0.1mL / min. The sampling device can determine the flow rate fluctuation during the detection process, and thus determine whether the flow rate fluctuation during the detection process exceeds ±10mL / min.

[0030] (3) The sampling device provided by the utility model is connected to a mass flow meter at the discharge port. When calibrating a pump-suction oxygen analyzer, the discharge condition of the flow here can be observed to ensure that all the gas inhaled by the oxygen analyzer is standard gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of a sampling device for verification and calibration of a trace oxygen analyzer provided in an embodiment of the utility model.

[0032] In the figure: 1-standard substance, 2-zero gas supply end, 3-first standard substance supply end, 4-second standard substance supply end, 5-third standard substance supply end, 6-first switch valve, 7-second valve, 8-third valve, 9-second switch valve, 10-third switch valve, 11-fourth switch valve, 100-metering valve, 110-fourth valve, 120-deoxygenation equipment, 130-fifth valve, 140-second flow detection equipment, 150-sixth valve, 160-first valve, 170-seventh valve, 180-pressure gauge, 190-sampling device outlet, 200-first flow detection equipment, 210-discharge port.

[0033] The utility model is further described in detail below. However, the following examples are only simple examples of the utility model and do not represent or limit the scope of protection of the utility model. The scope of protection of the utility model shall be subject to the claims. DETAILED DESCRIPTION

[0034] In order to better illustrate the present invention and facilitate understanding of the technical solution of the present invention, typical but non-limiting embodiments of the present invention are as follows:

[0035] This embodiment provides a sampling device for the calibration of a trace oxygen analyzer, such as Figure 1 As shown, the verification and calibration sampling device for the trace oxygen analyzer comprises:

[0036] Standard material feeding end and verification and calibration end;

[0037] The discharge port of the standard material feeding end is connected to the feed port of the calibration end through a metering valve 100;

[0038] The standard substance feeding end includes a zero-point gas feeding end 2 and at least three standard substance feeding ends which are interconnected;

[0039] The zero gas inlet port 2 is connected to all standard substance inlet ports via a bypass;

[0040] The verification and calibration end includes a first valve 160 and a sampling device outlet end 190 which are sequentially connected through a pipeline;

[0041] An exhaust branch and a flow monitoring branch are connected to the pipeline between the metering valve 100 and the first valve 160;

[0042] The monitoring flow branch is connected to the pipeline between the first valve 160 and the sampling device outlet 190;

[0043] A leak detection branch is provided between the first valve 160 and the outlet end 190 of the sampling device.

[0044] Wherein, the air inlets of the zero-point gas supply end 2 and at least three standard substance supply ends are all equipped with switch valves.

[0045] In the utility model, at least three standard material feed ends can be reasonably selected and designed according to the actual detection needs, such as setting four standard material feed ends, setting five standard material feed ends, setting six standard material feed ends, etc., but there must be at least three standard material feed ends to comply with JJG945-2010 Trace Oxygen Analyzer Verification Procedure.

[0046] In the utility model, the standard material feeding end includes a zero-point gas feeding end 2 and three standard material feeding ends that are interconnected. The exemplary standard material feeding end is a six-way interface, that is, the configuration of the standard material feeding end is realized by using a device with six material ports that are connected to each other, one of which is connected to the metering valve 100, and the bypass is connected to another material port, and the remaining material ports are respectively configured with the zero-point gas feeding end 2 and the three standard material feeding ends, exemplarily, the zero-point gas feeding end 2 and the configured first switch valve 6, the first standard material feeding end 3 and the configured second switch valve 9, the second standard material feeding end 4 and the configured third switch valve 10, the third standard material feeding end 5 and the configured fourth switch valve 11, and then different standard substances 1 such as standard gases are fed from different configurations.

[0047] The bypass includes a second valve 7, a deoxygenation device 120 and a third valve 8 which are sequentially connected through pipelines.

[0048] In the present invention, the deoxidation equipment 120 used can be a commonly used gas deoxidation equipment 120 in the art, such as a deoxidation tube.

[0049] Wherein, the pipeline between the zero-point gas inlet and the switch valve in the zero-point gas supply end 2 is connected to the second valve 7 through a pipeline.

[0050] The metering valve 100 is connected to the first valve 160 via a pipeline.

[0051] The exhaust port 210 of the exhaust branch is provided with a fourth valve 110 and a first flow detection device 200 .

[0052] The monitoring flow branch includes a fifth valve 130, a second flow detection device 140 and a sixth valve 150 which are sequentially connected through pipelines.

[0053] The sixth valve 150 is connected to a pipeline between the first valve 160 and an outlet end 190 of the sampling device.

[0054] The leak detection branch is sequentially provided with a seventh valve 170 and a pressure gauge 180 .

[0055] The sixth valve 150 and the seventh valve 170 are connected via a pipeline.

[0056] In the present invention, the switch valve, the first valve 160, the second valve 7, the third valve 8, the fourth valve 110, the fifth valve 130, the sixth valve 150 and the seventh valve 170 used are all valves for isolating gas transmission in the art, such as diaphragm valves.

[0057] In the present invention, the flow detection device used can be a commonly used flow detection device in the field, such as a mass flow meter.

[0058] In the present invention, the pipes connecting the various devices can be selected from commonly used pipes in the field according to actual needs, as long as they do not affect the test results.

[0059] In the utility model, each device can be connected to the control center by intelligent devices such as solenoid valves, and can be linked with other related devices to realize intelligent control of each device, thereby realizing the automation and intelligent operation of the verification and calibration sampling device.

[0060] Furthermore, the utility model provides an exemplary specific use process of the verification and calibration sampling device for the trace oxygen analyzer, which is as follows:

[0061] (1) Build a sampling device that can simultaneously connect 4 bottles of gas standard substances with different concentrations, can achieve rapid switching and eliminate the influence of air. The zero gas inlet 2 is connected to 99.999% nitrogen, the first standard substance inlet 3 is connected to a gas standard substance cylinder with about 20% of the full scale of the instrument, the second standard substance inlet 4 is connected to a gas standard substance cylinder with about 50% of the full scale of the instrument, the third standard substance inlet 5 is connected to a gas standard substance cylinder with about 80% of the full scale of the instrument, and the outlet 190 of the sampling device is connected to the inlet of the trace oxygen analyzer.

[0062] Initially, all relevant valves are in a closed state, the first switch valve 6 is opened, the metering valve 100 is opened, the 99.999% nitrogen cylinder is opened, the pressure reducing valve is adjusted, and the zero-point gas flows to the metering valve 100; the first switch valve 6 is closed, the second valve 7 and the third valve 8 are opened, and the zero-point gas flows to the metering valve 100 after being deoxygenated by the deoxygenation equipment 120.

[0063] Close the second valve 7 and the third valve 8, open the second switch valve 9, open the gas standard material cylinder with 20% of the full scale of the instrument, adjust the pressure reducing valve, and 20% of the standard material of the full scale of the instrument flows to the metering valve 100.

[0064] Close the second switch valve 9, open the third switch valve 10, open the gas standard substance cylinder of 50% of the full scale of the instrument, adjust the pressure reducing valve, and 50% of the gas standard substance of the full scale of the instrument flows to the metering valve 100.

[0065] Close the third switch valve 10, open the fourth switch valve 11, open the gas standard substance cylinder of 80% of the full scale of the instrument, adjust the pressure reducing valve, and about 80% of the gas standard substance of the full scale of the instrument flows to the metering valve 100.

[0066] The first valve 160 is opened, and the gas standard substance flows to the trace oxygen analyzer through the outlet end 190 of the sampling device.

[0067] When the zero gas is introduced, the pipeline is purged to reduce the oxygen content in the pipeline and the instrument to the minimum, and then the other three gas standard substances are switched to achieve the purpose of saving time and cost.

[0068] (2) Control of gas flow: The gas standard substance flows through the metering valve 100, the fifth valve 130 is opened, the sixth valve 150 is opened, the first valve 160 is closed, the gas standard substance flows to the second flow detection device 140, the gas standard substance flows to the outlet end 190 of the sampling device, and flows to the trace oxygen analyzer. The metering valve 100 is adjusted to the required flow. After the adjusted flow is stable, the fifth valve 130 and the sixth valve 150 are closed, the first valve 160 is opened, and the flow flows to the trace oxygen analyzer. At the same time, in order to ensure that the standard gas substance flows through the pipeline, a bypass is designed.

[0069] The whole set of equipment uses internally polished stainless steel pipelines, and the inside of the diaphragm valve is also internally polished. Except for the connection between the second flow detection device 140 and the deoxygenation device 120, which uses a ferrule connection, all other connections are VCR connections. The resolution of the selected second flow detection device 140 is 0.1mL / min, and the fluctuation of the flow rate can be judged during the detection process.

[0070] (3) Leak detection of gas circuit: Seal the outlet 190 of the sampling device, open the first switch valve 6, the second valve 7, the third valve 8, the fifth valve 130, the sixth valve 150, the first valve 160, the seventh valve 170 and the metering valve 100, close the other diaphragm valves, open the zero gas cylinder, adjust the pressure to 0.25 MPa, and observe the pressure change of the digital pressure gauge 180 for 30 minutes. The pressure drop should be no more than 0.01 MPa, that is, the gas circuit has good sealing performance.

[0071] Seal the outlet end 190 of the sampling device, open the second switch valve 9, the fifth valve 130, the sixth valve 150, the first valve 160, the seventh valve 170 and the metering valve 100, close the other diaphragm valves, open the gas standard material cylinder of about 20% of the full scale of the instrument, adjust the pressure to 0.25MPa, observe the pressure change of the digital pressure gauge 180 for 30 minutes, and the pressure drop should be no more than 0.01MPa, that is, the gas path has good sealing performance.

[0072] Seal the outlet 190 of the sampling device, open the third switch valve 10, the fifth valve 130, the sixth valve 150, the first valve 160, the seventh valve 170 and the metering valve 100, close the other diaphragm valves, open the gas standard material cylinder of about 50% of the full scale of the instrument, adjust the pressure to 0.25MPa, observe the pressure change of the digital pressure gauge 180 for 30 minutes, and the pressure drop should be no more than 0.01MPa, that is, the gas path has good sealing performance.

[0073] Seal the outlet 190 of the sampling device, open the fourth switch valve 11, the fifth valve 130, the sixth valve 150, the first valve 160, the seventh valve 170 and the metering valve 100, close the other diaphragm valves, open the gas standard material cylinder of about 80% of the full scale of the instrument, adjust the pressure to 0.25MPa, observe the pressure change of the digital pressure gauge 180 for 30 minutes, and the pressure drop should be no more than 0.01MPa, that is, the gas path has good sealing performance.

[0074] (4) When calibrating a pump-suction type trace oxygen analyzer, open the fourth valve 110 to ensure that the discharge port 210 is vented, thereby ensuring that all the gas sucked into the trace oxygen analyzer is a gas standard substance. Since the pump suction flow value of the trace oxygen analyzer is fixed, the flow of the discharge port 210 can be adjusted by adjusting the metering valve 100, and the flow of the discharge port 210 can be monitored by the first flow detection device 200.

[0075] In summary, the verification and calibration sampling device for the trace oxygen analyzer provided by the utility model can realize the fluctuation of the flow rate in the gas circuit and realize the leak detection of the gas circuit, thereby ensuring the efficiency and accuracy of the verification and calibration sampling process.

[0076] It is stated that the utility model uses the above embodiments to illustrate the detailed structural features of the utility model, but the utility model is not limited to the above detailed structural features, that is, it does not mean that the utility model must rely on the above detailed structural features to be implemented. Those skilled in the art should understand that any improvement to the utility model, equivalent replacement of the components selected by the utility model, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the utility model.

[0077] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention.

[0078] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present utility model will not further describe various possible combinations.

[0079] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A sampling device for the verification and calibration of a trace oxygen analyzer, characterized in that: The verification and calibration sampling device for the trace oxygen analyzer comprises: Standard material feeding end and verification and calibration end; The discharge port of the standard material feeding end is connected to the feed port of the calibration end through a metering valve; The standard substance feeding end includes a zero-point gas feeding end and at least three standard substance feeding ends which are interconnected; The zero gas supply end is connected with all standard substance supply ends through a bypass; The verification and calibration end includes a first valve and a sampling device outlet end connected in sequence through a pipeline; An exhaust branch and a flow monitoring branch are connected to the pipeline between the metering valve and the first valve; The monitoring flow branch is connected to the pipeline between the first valve and the outlet end of the sampling device; A leak detection branch is provided between the first valve and the outlet end of the sampling device.

2. The calibration sampling device for a trace oxygen analyzer according to claim 1, characterized in that: The air inlets of the zero-point gas supply end and at least three standard substance supply ends are all equipped with switch valves.

3. The calibration sampling device for a trace oxygen analyzer according to claim 2, characterized in that: The bypass includes a second valve, a deoxygenation device and a third valve which are sequentially connected through pipelines.

4. The calibration sampling device for a trace oxygen analyzer according to claim 3, characterized in that: The switch valve configured at the zero-gas supply end is connected to the second valve through a pipeline.

5. The calibration sampling device for a trace oxygen analyzer according to claim 1, characterized in that: The metering valve is connected to the first valve through a pipeline.

6. The calibration sampling device for a trace oxygen analyzer according to claim 1, characterized in that: The exhaust port of the exhaust branch is provided with a fourth valve and a first flow detection device.

7. The calibration sampling device for a trace oxygen analyzer according to claim 1, characterized in that: The monitoring flow branch includes a fifth valve, a second flow detection device and a sixth valve which are sequentially connected through pipelines.

8. The calibration sampling device for a trace oxygen analyzer according to claim 7, characterized in that: The sixth valve is connected to the pipeline between the first valve and the outlet end of the sampling device.

9. The calibration sampling device for a trace oxygen analyzer according to claim 7, characterized in that: The leak detection branch is sequentially provided with a seventh valve and a pressure gauge.

10. The calibration sampling device for a trace oxygen analyzer according to claim 9, characterized in that: The sixth valve is connected to the seventh valve through a pipeline.

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