Efficient integrated nitrogen component analysis device

Abstract

The utility model discloses an efficient integrated nitrogen component analysis device, which belongs to the technical field of chemical analysis, and comprises a flow distributor, a nitrogen sampling steel cylinder, a nitrogen sampling steel cylinder, a nitrogen sampling steel cylinder and a nitrogen sampling steel cylinder, the plurality of control valves are connected with the flow distributor; the analysis system comprises a chilled mirror dew-point instrument, a trace oxygen analyzer and a gas chromatograph, and the chilled mirror dew-point instrument, the trace oxygen analyzer and the gas chromatograph are respectively communicated with the flow distributor through a plurality of control valves; wherein the flow distributor, the plurality of control valves and the analysis system are sequentially arranged in the flowing direction of nitrogen, and a plurality of gas circulation pipelines are formed between the flow distributor and the analysis system. In order to solve the problems that in the prior art, multiple times of sample injection are needed, the needed sample amount is large, and the testing cost is high, multiple parameters are analyzed at the same time through one-time sample injection, and the sample and testing cost is saved.

Description

Highly efficient integrated nitrogen composition analysis device Technical Field

[0001] This invention relates to the field of chemical analysis technology. More specifically, it relates to a highly efficient integrated nitrogen composition analysis device. Background Technology

[0002] In numerous industrial sectors such as chemical, electronics, and food, there are stringent requirements for nitrogen purity and impurity content. For example, in semiconductor manufacturing, ultra-high purity nitrogen is needed to protect chips from contamination by impurities; even the smallest impurity can affect chip performance. Nitrogen composition analysis allows for precise control of nitrogen quality, ensuring smooth industrial production and product quality. In food processing, such as in puffed foods, milk powder, and beverages, nitrogen is primarily used as a processing aid to isolate oxygen, prevent oxidation of food components, inhibit the growth of certain microorganisms, and increase the strength of food packaging, making it less susceptible to damage during production and transportation. Currently, according to national standards, nitrogen analysis requires testing multiple items using different equipment, multiple sample injections, a large sample volume, frequent sample handling, and repeated equipment connections, resulting in a complex testing process and high labor and time costs. Summary of the Invention

[0003] One object of this invention is to solve at least the aforementioned problems and / or defects, and to provide at least the advantages described below.

[0004] The purpose of this invention is to provide a highly efficient and integrated nitrogen composition analysis device, which addresses the problems of existing technologies that require multiple sample injections, large sample volumes, and high testing costs. This device enables the simultaneous analysis of multiple parameters with a single sample injection, saving on sample and testing costs.

[0005] To achieve the objectives and other advantages of this invention, a highly efficient integrated nitrogen composition analysis device is provided, comprising:

[0006] A flow distributor connected to a nitrogen sampling cylinder;

[0007] Multiple control valves are connected to a flow distributor;

[0008] The analysis system includes a cold mirror dew point meter, a trace oxygen analyzer, and a gas chromatograph, which are connected to a flow distributor via multiple control valves.

[0009] The flow distributor, multiple control valves, and analysis system are arranged sequentially in the direction of nitrogen flow, forming multiple gas flow pipelines between the flow distributor and the analysis system.

[0010] Preferably, the plurality of control valves include: solenoid valve one, solenoid valve two, solenoid valve three, solenoid valve four and solenoid valve five; the flow distributor includes electronic flow controller one and electronic flow controller two;

[0011] The electronic flow controller 1 has its inlet connected to a nitrogen sampling cylinder and its outlet connected to the inlets of solenoid valves 1, 2, and 4. The outlet of solenoid valve 1 is connected to the input of a cold mirror dew point meter to form a first gas flow pipeline. The outlet of solenoid valve 2 is connected to the input of a trace oxygen analyzer to form a second gas flow pipeline. The outlet of solenoid valve 4 is connected to the input of a gas chromatograph to form a third gas flow pipeline. The output of the cold mirror dew point meter is connected to the inlet of solenoid valve 3 and the input of the trace oxygen analyzer. The output of the trace oxygen analyzer is connected to the inlet of solenoid valve 5 and the input of the gas chromatograph. The outlets of solenoid valves 3 and 5 are both connected to the inlet of the electronic flow controller 2.

[0012] Preferably, the quantitative loop outlet of the gas chromatograph is connected to the input end of the micro oxygen analyzer via a fixed pipeline.

[0013] Preferably, the gas chromatograph has a first quick-connect connector on the injection gas path and a second quick-connect connector near the outlet of the nitrogen sampling cylinder. The first and second quick-connect connectors are adapted to connect to enable the gas chromatograph to directly sample the nitrogen sampling cylinder.

[0014] Preferably, a multi-stage sealing structure is provided between the first quick-connect connector and the second quick-connect connector, which includes an axial sealing structure and a radial sealing structure.

[0015] Preferably, the axial sealing structure includes a main sealing gasket and a sealing ring. The main sealing gasket is located at the mating surface of the first quick-connect connector and the second quick-connect connector. The sealing ring is located on the outside of the main sealing gasket, and one side of the sealing ring is designed with multiple outwardly protruding lip structures.

[0016] Preferably, the radial sealing structure includes an O-ring, which is disposed on the outer surface of the insertion portion of the first quick-connect connector. The outer surface of the O-ring has a spiral groove, and the inner surface of the second quick-connect connector, which is adapted to the first quick-connect connector, has a spiral protrusion adapted to the spiral groove.

[0017] Preferably, a sealing grease layer is provided between the sealing ring and the main sealing gasket.

[0018] This utility model has at least the following beneficial effects:

[0019] First, the efficient integrated nitrogen composition analysis device of this utility model achieves simultaneous analysis of multiple parameters with a single sample injection through a flow distributor, multiple control valves, and integration of various testing instruments, thus saving sample and testing costs.

[0020] Secondly, the efficient integrated nitrogen composition analysis device of this utility model selects different components in nitrogen for testing by opening and closing different solenoid valves. Testers can select different test paths as needed, making it widely applicable.

[0021] Third, the efficient integrated nitrogen composition analysis device of this utility model improves the convenience of operation by modifying the outlet of the nitrogen sampling cylinder and replacing the traditional threaded connection with a quick-connect connection, making it simple and efficient.

[0022] Fourth, the efficient integrated nitrogen composition analysis device of this utility model uses a multi-level sealing design between quick-connect parts to seal the connection parts from different levels and angles, preventing gas leakage and improving the reliability and sealing of the connection.

[0023] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0024] Figure 1 is a schematic diagram of the structure of a highly efficient integrated nitrogen composition analysis device according to an embodiment of the present invention;

[0025] Figure 2 is a schematic diagram of the structure of a highly efficient integrated nitrogen composition analysis device according to another embodiment of the present invention;

[0026] Figure reference numerals: 1: Cold mirror dew point meter, 2: Trace oxygen analyzer, 3: Gas chromatograph, 4: Solenoid valve one, 5: Solenoid valve two, 6: Solenoid valve three, 7: Solenoid valve four, 8: Solenoid valve five, 9: Electronic flow controller one, 10: Electronic flow controller two, 11: First quick-connect connector, 12: Second quick-connect connector. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0028] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0029] It should be noted that in the description of this utility model, the terms "horizontal", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] It should be noted that, unless otherwise specified, the control methods in the following technical solutions are conventional methods, and the equipment structures, unless otherwise specified, can be obtained commercially.

[0031] Cold mirror dew point meter (Tianjin Hongchengtai Technology Development Co., Ltd.), trace oxygen analyzer (Nanjing Aiyi Technology Co., Ltd.), gas chromatograph (Shandong Luchuang Analytical Instrument Co., Ltd.), solenoid valve (AirTAC), electronic flow controller (Shanghai Puli Gas Technology Co., Ltd.).

[0032] As shown in Figures 1 and 2, this utility model provides a highly efficient integrated nitrogen composition analysis device, comprising:

[0033] A flow distributor connected to a nitrogen sampling cylinder;

[0034] Multiple control valves are connected to a flow distributor;

[0035] The analysis system includes a cold mirror dew point meter 1, a trace oxygen analyzer 2, and a gas chromatograph 3. The cold mirror dew point meter 1, the trace oxygen analyzer 2, and the gas chromatograph 3 are connected to a flow distributor through multiple control valves.

[0036] The flow distributor, multiple control valves, and analysis system are arranged sequentially in the direction of nitrogen flow, forming multiple gas flow pipelines between the flow distributor and the analysis system.

[0037] In the above technical solution, the flow distributor is selected as a high-precision, corrosion-resistant flow distributor with a flow adjustment range that meets the nitrogen sampling requirements. It is installed on a stable bracket close to the nitrogen sampling cylinder, ensuring that the two are tightly connected through a pressure-resistant and corrosion-resistant stainless steel pipe. The pipe connection uses welding or special sealing joints with good sealing performance to prevent nitrogen leakage.

[0038] Control valves: Select appropriate specifications and types of control valves (such as electric regulating valves, pneumatic regulating valves, etc.) according to the flow requirements of each instrument in the analysis system. Connect multiple control valves sequentially to the output ports of the flow distributor, also using stainless steel pipes for connection. The installation position of each control valve should be convenient for operation and maintenance, and sufficient space should be reserved around it for subsequent maintenance.

[0039] The analysis system, consisting of a cold mirror dew point meter 1, a trace oxygen analyzer 2, and a gas chromatograph 3, is placed on a dedicated instrument analysis platform with good grounding and anti-interference performance. Following the instrument manual, the cold mirror dew point meter 1, trace oxygen analyzer 2, and gas chromatograph 3 are connected to the flow distributor via their respective control valves. The connecting pipes are kept to a short path to reduce pressure loss and impurity adsorption during gas transmission.

[0040] Gas flow pipeline installation

[0041] Between the flow distributor and the analysis system, an independent gas flow line is set up for each analytical instrument. For example, three different lines are led out from the flow distributor, corresponding to the cold mirror dew point meter 1, the trace oxygen analyzer 2, and the gas chromatograph 3, respectively. The control valve of each line is used to precisely control the flow rate and pressure of nitrogen entering the corresponding instrument.

[0042] Necessary pressure and flow sensors are installed on the pipeline to monitor the gas pressure and flow data in real time and feed the data back to the control system so that operators can adjust the opening of the control valves in a timely manner to ensure that all instruments are always operating under optimal conditions.

[0043] System Operation and Control

[0044] Open the nitrogen sampling cylinder valve. After the nitrogen is initially distributed by the flow distributor, it enters each control valve. According to the working requirements of each instrument in the analysis system, the operator remotely or locally adjusts the opening of the control valve through the control system to allow nitrogen of different flow rates to enter the cold mirror dew point meter 1, the trace oxygen analyzer 2, and the gas chromatograph 3 respectively.

[0045] The cold mirror dew point meter 1 is used to detect the dew point in nitrogen, i.e., the moisture content; the trace oxygen analyzer 2 detects the trace oxygen content in nitrogen; and the gas chromatograph 3 performs qualitative and quantitative analysis of other gaseous components in nitrogen (such as carbon monoxide and carbon dioxide). The flow distributor, control valves, and analysis system are regularly calibrated and maintained to ensure the measurement accuracy and stability of the entire system. Simultaneously, a safety alarm device is installed to promptly issue an alarm and take appropriate protective measures, such as closing relevant valves, in case of abnormal gas flow, pressure, or instrument malfunction, to prevent accidents.

[0046] In another technical solution, multiple control valves include: solenoid valve 1 4, solenoid valve 2 5, solenoid valve 3 6, solenoid valve 4 7 and solenoid valve 5 8; the flow distributor includes electronic flow controller 1 9 and electronic flow controller 2 10;

[0047] Among them, the inlet of the electronic flow controller 19 is connected to the nitrogen sampling cylinder, and the outlet is connected to the inlets of solenoid valve 14, solenoid valve 25 and solenoid valve 47. The outlet of solenoid valve 14 is connected to the input of the cold mirror dew point meter 1 to form a first gas flow pipeline. The outlet of solenoid valve 25 is connected to the input of the trace oxygen analyzer 2 to form a second gas flow pipeline. The outlet of solenoid valve 47 is connected to the input of the gas chromatograph 3 to form a third gas flow pipeline. The output of the cold mirror dew point meter 1 is connected to the inlet of solenoid valve 36 and the input of the trace oxygen analyzer 2. The output of the trace oxygen analyzer 2 is connected to the inlet of solenoid valve 58 and the input of the gas chromatograph 3. The outlets of solenoid valve 36 and solenoid valve 58 are both connected to the inlet of the electronic flow controller 20.

[0048] In the above technical solution, as shown in Figure 1, electronic flow controller 9 and electronic flow controller 10 (Shanghai Puli Gas Technology Co., Ltd.) are used to precisely control the gas flow rate to meet the gas flow requirements under different test modes. The inlet of electronic flow controller 9 is connected to the outlet of nitrogen sampling cylinder through a suitable pipe (such as stainless steel pipe or Teflon pipe). The outlet of electronic flow controller 9 is connected to cold mirror dew point meter 1 through a pipe and solenoid valve 4 to form a first gas flow pipeline. The second gas flow pipeline is connected to trace oxygen analyzer 2 through a pipe and solenoid valve 5. The third gas flow pipeline is connected to gas chromatograph 3 through a pipe and solenoid valve 7.

[0049] The test mode is as follows:

[0050] Mode 1: All parameters in nitrogen are tested simultaneously. The flow rate of electronic flow controller 19 is 300 mL / min, the flow rate of electronic flow controller 210 is 290 mL / min, and solenoid valves 14 and 58 are open while the others are closed.

[0051] When all parameters in the nitrogen gas need to be tested, after setting the flow parameters of electronic flow controller 9 and electronic flow controller 10 respectively, solenoid valve 4 and solenoid valve 8 are opened while the others are closed. At this time, nitrogen gas flows out from the nitrogen sampling cylinder and is distributed by electronic flow controller 9. Part of the gas enters the cold mirror dew point meter 1 through the first gas flow pipeline to detect the moisture content; the other part enters the subsequent analysis instruments through solenoid valve 8, and finally completes the simultaneous detection of multiple parameters. The detection data is displayed on the display screen of each instrument in real time, or the data can be transmitted to the corresponding file storage location through the data transmission interface.

[0052] Mode 2: Moisture content is tested separately. The flow rate of electronic flow controller 19 is 300 mL / min, the flow rate of electronic flow controller 210 is 300 mL / min, and solenoid valves 14 and 36 are open while the others are closed.

[0053] When only the moisture content in nitrogen needs to be detected, after setting the flow parameters of electronic flow controller 9 and electronic flow controller 10 respectively, solenoid valve 4 and solenoid valve 6 are opened while the others are closed. Nitrogen enters the first gas flow pipeline through electronic flow controller 9. After the moisture detection is completed in the cold mirror dew point meter 1, the gas flows into electronic flow controller 10 through solenoid valve 6 and is discharged to avoid gas residue interfering with subsequent detection. The detection result is directly displayed on the cold mirror dew point meter 1.

[0054] Mode 3: Test oxygen separately. The flow rate of electronic flow controller 19 is 100 mL / min, the flow rate of electronic flow controller 210 is 100 mL / min, and solenoid valves 25 and 58 are open while others are closed.

[0055] When only the oxygen content in nitrogen needs to be detected, after setting the flow parameters of electronic flow controller 9 and electronic flow controller 10 respectively, solenoid valve 5 and solenoid valve 8 are opened while the others are closed. Nitrogen enters the second gas flow pipeline through electronic flow controller 9, and the oxygen content is detected by micro oxygen analyzer 2. The detected gas flows into electronic flow controller 10 through solenoid valve 8 and is discharged. The operator can read the oxygen content data from the display screen of micro oxygen analyzer 2.

[0056] Mode 4: CO / CO2 test separately, flow rate of electronic flow controller 19 is 20 mL / min, flow rate of electronic flow controller 210 is 0 mL / min, solenoid valve 47 is open and the others are closed.

[0057] When only the content of carbon monoxide and carbon dioxide in nitrogen needs to be detected, after setting the flow parameters of electronic flow controller 9 and electronic flow controller 10 respectively, solenoid valve 7 is opened and the others are closed. Nitrogen enters the third gas flow pipeline through electronic flow controller 9, and carbon monoxide and carbon dioxide are detected and analyzed by gas chromatograph 3. The detected gas is discharged from the outlet of gas chromatograph 3, and the detection results are processed and displayed by the supporting software of gas chromatograph 3.

[0058] After completing all tests, close the nitrogen sampling cylinder and stop the gas supply. Close all solenoid valves to prevent gas backflow and leakage. Clean and calibrate the analytical instruments to prepare for the next test; regularly check all connecting pipelines for aging or damage, and replace damaged parts promptly to ensure the equipment is always in good working order.

[0059] In another technical solution, the quantitative loop outlet of the gas chromatograph 3 is connected to the input end of the micro oxygen analyzer 2 via a fixed pipeline.

[0060] In the above technical solution, the quantitative loop outlet of the gas chromatograph 3 is connected to the input of the micro oxygen analyzer 2 via a fixed pipeline. Nitrogen gas enters the gas chromatograph 3 at a stable flow rate under the control of the electronic flow controller 9. In the gas chromatograph 3, the nitrogen sample first enters the quantitative loop. After reaching the set injection volume, the sample in the quantitative loop is injected into the chromatographic column for separation. Due to the different retention times of CO and CO2 on the chromatographic column, they will flow out of the column sequentially and enter the detector for detection. The detector converts the detected signal into an electrical signal and transmits it to the data analysis system of the gas chromatograph to obtain the CO and CO2 content data. The gas flowing out of the quantitative loop of the gas chromatograph 3 directly enters the micro oxygen analyzer 2 via a dedicated fixed pipeline. The micro oxygen analyzer 2 detects the oxygen in the gas, converting the oxygen content into an electrical signal through its internal sensor. After amplification and processing, the oxygen content data is displayed. This allows for the simultaneous, rapid, and convenient detection of the CO, CO2, and O2 content in nitrogen gas through a single gas path.

[0061] The fixed pipeline needs to have good airtightness and chemical stability, meeting gas transmission requirements without adsorbing or chemically reacting with the detection gas. Using 316 stainless steel with a spot-polished inner wall results in extremely low surface roughness, effectively reducing gas adsorption and residue during flow, ensuring the detection gas composition remains unaffected, and thus improving detection accuracy. Based on the interface dimensions and gas flow requirements of the gas chromatograph 3 and the trace oxygen analyzer 2, if the quantitative loop outlet diameter is 6 mm and the trace oxygen analyzer 2 inlet diameter is 8 mm, a reducing connector is used for transition. One end of the reducing connector has an inner diameter of 6 mm, tightly fitting onto the quantitative loop outlet, while the other end has an inner diameter of 8 mm, connecting to the trace oxygen analyzer 2 inlet, ensuring a tight, seamless connection to prevent gas leakage or impurity contamination. A double-ferrule connector is used at the gas chromatograph quantitative loop outlet and one end of the dedicated fixed pipeline. First, slip the front and rear ferrules onto the pipeline in sequence. Then, insert the pipeline into the metering loop outlet and tighten the nut to ensure the ferrules firmly grip the pipeline and metering loop outlet, achieving a sealed connection. At the other end of the dedicated fixed pipeline, connect the oxygen analyzer inlet using argon arc welding to ensure a smooth, flat weld free of pores, guaranteeing a tight and secure connection, preventing gas leakage, and ensuring stable gas transmission to the oxygen analyzer for detection. The fixed pipeline is installed following the shortest path principle. Starting from the gas chromatograph metering loop outlet, it connects to the oxygen analyzer inlet in a straight or near-straight line along the internal structural frame of the equipment, reducing gas transmission distance and minimizing the possibility of gas residue and diffusion. Furthermore, during installation, maintain a safe distance from other components to avoid interference with carrier gas pipelines, electrical circuits, etc., ensuring the overall stability of the equipment operation and the accuracy of the detection results.

[0062] In another technical solution, the gas chromatograph 3 is provided with a first quick-connect connector 11 on the injection gas path and a second quick-connect connector 12 near the outlet of the nitrogen sampling cylinder. The first quick-connect connector 11 and the second quick-connect connector 12 are adapted to connect to enable the gas chromatograph 3 to directly sample the nitrogen sampling cylinder.

[0063] In the above technical solution, as shown in Figure 2, a first quick-connect connector 11 is installed in the injection gas path of the gas chromatograph 3. This quick-connect connector is made of 316L stainless steel, which has good sealing performance, can withstand certain pressure, and is chemically stable, preventing contamination of the sample gas. The specifications of this connector match the diameter of the gas chromatograph's injection gas path, ensuring a tight installation. A second quick-connect connector 12, also made of 316L stainless steel, is installed near the outlet of the nitrogen sampling cylinder. It is perfectly compatible with the first quick-connect connector 11, ensuring a reliable seal when the two are connected. This connector also features quick insertion and removal for convenient operation.

[0064] Sampling process: The operator holds the injection tubing of the gas chromatograph 3 and aligns the first quick-connect connector 11 with the second quick-connect connector 12 at the outlet of the nitrogen sampling cylinder, and quickly inserts it. During insertion, the connector's locking mechanism will automatically engage, forming a tight connection, and a "click" sound will be heard, indicating a successful connection. At this point, the nitrogen sample from the nitrogen sampling cylinder enters the injection gas path of the gas chromatograph 3 directly through the quick-connect connector.

[0065] Start the injection program according to the gas chromatograph operating procedure, set the appropriate injection volume, and allow the nitrogen sample to enter the chromatographic column for separation. During the separation process, gaseous components such as CO and CO2 are separated sequentially according to their different retention times on the chromatographic column and enter the detector for detection. The detector converts the detected signal into an electrical signal and transmits it to the gas chromatograph's data analysis system. The system processes and analyzes the signal, and finally displays the CO and CO2 content data in the nitrogen on the instrument display screen. Operators can use this data to determine whether the nitrogen meets the standards for use in food packaging.

[0066] Post-sampling processing: After sampling, first close the valve of the nitrogen sampling cylinder to stop the gas supply. The operator presses the unlock button on the first quick-connect connector 11 and gently pulls out the connector to separate it from the second quick-connect connector 12. After separation, properly place the injection tubing of the gas chromatograph 3 to avoid contamination. Clean and shut down the gas chromatograph 3, and purge the column with carrier gas to remove residual sample gas and extend the column's lifespan. Simultaneously, clean and inspect the first quick-connect connector 11 and the second quick-connect connector 12; replace any damaged connectors promptly to prepare for the next sampling.

[0067] In another technical solution, a multi-stage sealing structure is provided between the first quick-connect connector 11 and the second quick-connect connector 12, which includes an axial sealing structure and a radial sealing structure.

[0068] In the aforementioned technical solution, the purity requirements for nitrogen in the aerospace field are extremely high to ensure the safe and stable operation of various aircraft systems. During nitrogen composition analysis, the sampling accuracy of the gas chromatograph is crucial. A multi-stage sealing structure, including axial and radial sealing structures, is implemented between the first quick-connect connector 11 and the second quick-connect connector 12. The axial sealing structure primarily prevents gas leakage along the axial direction at the mating surfaces of the first and second quick-connect connectors 11 and 12; the radial sealing structure primarily prevents gas leakage along the circumferential direction of the insertion points of the first and second quick-connect connectors 11 and 12. This multi-stage sealing design seals the connection from different levels and angles, preventing gas leakage and improving the reliability and sealing performance of the connection.

[0069] In another technical solution, the axial sealing structure includes a main sealing gasket and a sealing ring. The main sealing gasket is located at the mating surface of the first quick-connect connector 11 and the second quick-connect connector 12. The sealing ring is located on the outside of the main sealing gasket, and one side of the sealing ring is designed with multiple outwardly protruding lip structures.

[0070] In another technical solution, the radial sealing structure includes an O-ring, which is disposed on the outer surface of the insertion portion of the first quick-connect connector 11. The outer surface of the O-ring is provided with a spiral groove, and the inner surface of the second quick-connect connector 12, which is adapted to the first quick-connect connector 11, is provided with a spiral protrusion adapted to the spiral groove.

[0071] In another technical solution, a sealing grease layer is provided between the sealing ring and the main sealing gasket.

[0072] A main sealing gasket, made of polyimide, is installed at the mating surfaces of the first quick-connect connector 11 and the second quick-connect connector 12. Polyimide possesses excellent high-temperature resistance and chemical corrosion resistance, maintaining stable sealing performance even in complex production environments. A 2 mm thick main sealing gasket is custom-made to fully cover the gaps between the mating surfaces, based on the dimensions of the mating surfaces of the first quick-connect connector 11 and the second quick-connect connector 12. The sealing ring is made of fluororubber, which exhibits good oil resistance, aging resistance, and sealing performance. The outer diameter of the sealing ring is slightly larger than that of the main sealing gasket, while its inner diameter matches that of the main sealing gasket. On one side of the sealing ring, multiple outwardly protruding lip structures are injection molded using a mold. Three lips are present, each 1 mm high, with a uniform spacing of approximately 2 mm between them. These lip structures can elastically deform under pressure, further enhancing the sealing effect.

[0073] The O-ring is made of silicone rubber, which has good flexibility and resistance to high and low temperatures. Based on the outer diameter of the insertion part of the first quick-connect connector 11, a suitable O-ring is selected to ensure a tight fit when installed on the outer surface of the insertion part. On the outer side of the O-ring, a spiral groove is machined with a depth of 0.5 mm and a pitch of 1 mm. On the inner surface of the second quick-connect connector 12, corresponding to the position of the spiral groove of the O-ring, a spiral protrusion is precision-machined to match the spiral groove. The height of the spiral protrusion is 0.5 mm, and the pitch is consistent with the spiral groove, ensuring a tight fit.

[0074] Detailed installation process:

[0075] Before installation, clean the first quick-connect connector 11, the second quick-connect connector 12, the main sealing gasket, the sealing ring, and the O-ring to remove dust, impurities, etc. from the surface to prevent affecting the sealing effect.

[0076] Place the main sealing gasket accurately at the mating surfaces of the first quick-connect connector 11 and the second quick-connect connector 12, ensuring that the gasket is centered and covers all gaps on the mating surfaces.

[0077] Install a sealing ring on the outside of the main sealing gasket, with the lip of the sealing ring facing the second quick-connect connector 12. During installation, gently press the sealing ring to ensure it fits snugly against the main sealing gasket.

[0078] Apply a uniform layer of sealing grease between the sealing ring and the main sealing gasket. The sealing grease should be a high-temperature resistant, low-volatility perfluoropolyether grease. Use a precision applicator to ensure a uniform grease layer thickness of approximately 0.1 mm. The grease layer not only fills any tiny gaps that may exist between the sealing ring and the main sealing gasket but also provides lubrication, facilitating the insertion and removal of the two connectors.

[0079] Install the O-ring on the outer surface of the insertion part of the first quick-connect connector 11 to ensure that it is securely installed and will not shift.

[0080] Use and Maintenance: During use, slowly insert the first quick-connect connector 11 into the second quick-connect connector 12. During insertion, the spiral grooves on the O-ring and the spiral protrusions on the inner surface of the second quick-connect connector 12 interact, generating a certain rotational resistance. This ensures that the O-ring fits tightly against the inner wall of the second quick-connect connector 12, achieving a good radial seal. Simultaneously, as the first quick-connect connector 11 is inserted into place, the lip structure of the sealing ring is compressed, resulting in elastic deformation and close contact with the surface of the second quick-connect connector 12, enhancing the axial sealing effect. The main sealing gasket also further seals the mating surface under the compression of the two connectors.

[0081] After each use, inspect the sealing structure of the connector. Observe whether the main sealing gasket is damaged or deformed, whether the lip structure of the sealing ring is intact, and whether the O-ring shows signs of wear or aging. If any problems are found, replace the corresponding sealing components in time. Regularly clean the connector and sealing components to remove surface dirt and residual impurities, and then reapply sealing grease to ensure that the sealing structure is always in good working condition, ensuring the accuracy of gas chromatograph sampling and meeting the stringent requirements of the high-end electronic chip manufacturing industry for nitrogen purity testing.

[0082] Although the technical solution of this utility model has been disclosed above, it is not limited to the applications listed in the specification and embodiments. It can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A highly efficient integrated nitrogen composition analysis device, characterized in that, include: A flow distributor connected to a nitrogen sampling cylinder; multiple control valves connected to the flow distributor; The analysis system includes a cold mirror dew point meter, a trace oxygen analyzer, and a gas chromatograph. The cold mirror dew point meter, the trace oxygen analyzer, and the gas chromatograph are each connected to a flow distributor through multiple control valves. The flow distributor, the multiple control valves, and the analysis system are arranged sequentially in the direction of nitrogen flow, and multiple gas flow pipelines are formed between the flow distributor and the analysis system.

2. The highly efficient integrated nitrogen composition analysis device as described in claim 1, characterized in that, The system includes multiple control valves: solenoid valve 1, solenoid valve 2, solenoid valve 3, solenoid valve 4, and solenoid valve 5; the flow distributor includes electronic flow controller 1 and electronic flow controller 2; wherein, the inlet of electronic flow controller 1 is connected to a nitrogen sampling cylinder, and the outlet is connected to the inlets of solenoid valves 1, 2, and 4; the outlet of solenoid valve 1 is connected to the input of a cold mirror dew point meter to form a first gas flow pipeline; the outlet of solenoid valve 2 is connected to the input of a trace oxygen analyzer to form a second gas flow pipeline; and the outlet of solenoid valve 4 is connected to the input of a gas chromatograph to form a third gas flow pipeline; the output of the cold mirror dew point meter is connected to the inlet of solenoid valve 3 and the input of the trace oxygen analyzer; the output of the trace oxygen analyzer is connected to the inlet of solenoid valve 5 and the input of the gas chromatograph; and the outlets of solenoid valves 3 and 5 are both connected to the inlet of electronic flow controller 2.

3. The highly efficient integrated nitrogen composition analysis device as described in claim 1, characterized in that, The quantitative loop outlet of the gas chromatograph is connected to the input end of the micro oxygen analyzer via a fixed pipeline.

4. The high-efficiency integrated nitrogen composition analysis device as described in claim 3, characterized in that, The gas chromatograph has a first quick-connect connector on the injection gas path and a second quick-connect connector near the outlet of the nitrogen sampling cylinder. The first and second quick-connect connectors are matched and connected to enable the gas chromatograph to directly sample the nitrogen sampling cylinder.

5. The high-efficiency integrated nitrogen composition analysis device as described in claim 4, characterized in that, A multi-stage sealing structure is provided between the first quick-connect connector and the second quick-connect connector, which includes an axial sealing structure and a radial sealing structure.

6. The high-efficiency integrated nitrogen composition analysis device as described in claim 5, characterized in that, The axial sealing structure includes a main sealing gasket and a sealing ring. The main sealing gasket is located at the mating surface of the first quick-connect connector and the second quick-connect connector. The sealing ring is located on the outside of the main sealing gasket, and one side of the sealing ring is designed with multiple outwardly protruding lip structures.

7. The high-efficiency integrated nitrogen composition analysis device as described in claim 5, characterized in that, The radial sealing structure includes an O-ring, which is disposed on the outer surface of the insertion portion of the first quick-connect connector. The outer surface of the O-ring has a spiral groove, and the inner surface of the second quick-connect connector, which is adapted to the first quick-connect connector, has a spiral protrusion that matches the spiral groove.

8. The high-efficiency integrated nitrogen composition analysis device as described in claim 6, characterized in that, A layer of sealing grease is provided between the sealing ring and the main sealing gasket.

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