High-precision multi-channel gas control device for trace gas monitoring

Abstract

The invention discloses a high-precision multi-channel gas control device for trace gas monitoring, and relates to the technical field of gas control. The high-precision multi-channel gas control device for trace gas monitoring comprises a gas inlet module, one end of the gas inlet module is provided with a circular sealing rotary connector, and the gas inlet module comprises a plurality of independent gas channels arranged in an annular array mode; under the driving of the high-precision harmonic speed reduction stepping motor, the circular sealing rotary connector can be quickly aligned with a target independent gas path channel, and the high-frequency response electromagnetic valve and the high-airtightness one-way valve are matched to complete channel switching; mutual interference of residual gas between the channels is avoided, in addition, the channel purging process is automatically executed by the purging module when the channels are switched, the residual gas can be removed, and efficient replacement can be carried out according to the calculated purging flow value and time.

Description

Technical Field

[0001] The invention relates to the technical field of gas control, and in particular to a high-precision multi-channel gas control device for trace gas monitoring. Background Art

[0002] As the core supporting equipment of trace gas monitoring analyzers, high-precision multi-channel gas control devices play a key role in automated performance index testing and long-term quality control assurance. The device needs to achieve pollution-free, rapid and stable control of the internal gas path. Its performance directly affects the accuracy and reliability of trace gas monitoring data.

[0003] The current mainstream devices have the following technical bottlenecks: First, insufficient sealing of the gas path can easily cause trace air infiltration contamination, resulting in a ppm-level or greater deviation in the target gas concentration; second, there is significant hysteresis in the gas replacement process, and the residual gas dead volume accounts for a large proportion, which greatly prolongs the analyzer response time; third, the traditional flow channel design has residual gas dead corners and backflow interference, and the cross-contamination risk factor is relatively high.

[0004] These technical defects not only extend the analyzer calibration cycle, but also lead to a decrease in the confidence of the monitoring data. In the ppb-level ultra-low concentration gas monitoring scenarios, order of magnitude deviations may occur, directly affecting the accuracy of decision-making in key areas such as environmental monitoring and industrial process control. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a high-precision multi-channel gas control device for trace gas monitoring, which solves the problems of poor airtightness and low gas replacement efficiency in the prior art.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A high-precision multi-channel gas control device for trace gas monitoring, comprising: an air intake module, one end of which is provided with a circular sealed rotary connector, and the air intake module includes a plurality of independent air channels arranged in a ring array; the output end of the circular sealed rotary connector is connected to a purge module, and the purge module is used to perform channel purge on the target independent air channel when the output end of the circular sealed rotary connector rotates to the target independent air channel, and the specific steps are as follows: obtaining the initial residual gas concentration value in the target independent air channel, the minimum target value of the residual gas concentration, the air channel volume value of the target independent air channel and the preset purge time, and performing comprehensive analysis to obtain the purge flow value of the target independent air channel, and the calculation formula is as follows: ;in, is the purge flow value of the target independent gas channel, is the purge efficiency coefficient stored in the database, is the gas channel volume value of the target independent gas channel, is the preset purge time, , They are, respectively, an initial residual gas concentration value and a minimum target residual gas concentration value in the target independent gas path channel; based on the purge flow value of the target independent gas path channel and a preset purge time, channel purge is performed on the target independent gas path channel.

[0007] Furthermore, each independent gas path channel comprises a stainless steel air intake pipeline, a high-frequency response solenoid valve is arranged at the air intake end of the stainless steel air intake pipeline, and a high-air-tightness one-way valve is arranged at one end of the high-frequency response solenoid valve.

[0008] Furthermore, it also includes: a temperature control module arranged at the output end of the circular sealed rotary connector; the temperature control module is used to monitor the gas temperature of the conveyed gas in real time and take temperature control measures when the gas temperature is abnormal.

[0009] Furthermore, the specific steps of real-time monitoring of the gas temperature of the conveying gas and taking temperature control measures when the gas temperature is abnormal are as follows: obtaining the current gas temperature value of the conveying gas in real time, and performing difference analysis with the preset gas temperature target value to obtain the gas temperature difference of the conveying gas; judging whether the gas temperature difference of the conveying gas is within the preset temperature difference range; when the gas temperature difference of the conveying gas is outside the preset temperature difference range, it is regarded as abnormal gas temperature of the conveying gas, and the gas temperature adjustment output power of the temperature control module is analyzed; based on the gas temperature adjustment output power of the temperature control module, temperature control measures are taken for the conveying gas.

[0010] Furthermore, the specific steps for analyzing the gas temperature adjustment output power of the temperature control module are as follows: obtaining the current state data and state parameter data of the conveying gas, wherein the current state data includes the current turbulence intensity value and the current particle concentration value, and the state parameter data includes the turbulence intensity parameter value and the particle concentration parameter value; obtaining the ambient temperature value and the ambient temperature parameter value within the set area of ​​the conveying gas, and performing a comprehensive analysis in combination with the current gas temperature value of the conveying gas, the preset gas temperature target value, the current state data and the state parameter data to obtain the gas temperature adjustment output power of the temperature control module.

[0011] Furthermore, the specific formula for calculating the gas temperature adjustment output power of the temperature control module is as follows: ;in, Adjust the output power for the gas temperature of the temperature control module, is the temperature control proportional coefficient stored in the database, , The following are the current gas temperature value of the transported gas and the preset gas temperature target value. , They are the ambient temperature value and ambient temperature parameter value in the set area of ​​the conveying gas. , , , They are the current turbulence intensity value of the transported gas, the turbulence intensity parameter value, the current particle concentration value, and the particle concentration parameter value. , , They are the ambient temperature influence coefficient, turbulence intensity influence coefficient, and particle concentration influence coefficient stored in the database respectively.

[0012] Furthermore, it also includes: a flow control module arranged at the output end of the circular sealed rotary connector (15); the flow control module is used to monitor the gas flow of the conveyed gas in real time and take flow control measures when the gas flow is abnormal.

[0013] Furthermore, the specific steps of real-time monitoring of the gas flow of the conveying gas and taking flow control measures when the gas flow is abnormal are as follows: obtaining the current gas flow value of the conveying gas in real time, and performing difference analysis with the preset gas flow target value to obtain the gas flow difference of the conveying gas; judging whether the gas flow difference of the conveying gas is within the preset flow difference range; when the gas flow difference of the conveying gas is outside the preset flow difference range, it is regarded as the gas flow of the conveying gas being abnormal, and the gas flow adjustment output power of the flow control module is analyzed; based on the gas flow adjustment output power of the flow control module, flow control measures are taken for the conveying gas.

[0014] Furthermore, the specific steps for analyzing the gas flow rate adjustment output power of the flow control module are as follows: obtaining the current environmental state data and environmental state parameter data within the set area of ​​the conveying gas, wherein the current environmental state data include the current environmental pressure value, the current environmental noise value, and the current environmental vibration amplitude value, and the environmental state parameter data include the environmental pressure parameter value, the environmental noise parameter value, and the environmental vibration amplitude parameter value; reading the current gas flow rate value of the conveying gas and the preset gas flow rate target value, and performing a comprehensive analysis in combination with the current environmental state data and the environmental state parameter data within the set area of ​​the conveying gas to obtain the gas flow rate adjustment output power of the flow control module.

[0015] Furthermore, the specific formula for calculating the gas flow adjustment output power of the flow control module is as follows: ;in, Adjust the output power for the gas flow of the flow control module, is the flow control proportional coefficient stored in the database, , The following are the current gas flow value of the transported gas and the preset gas flow target value. is the preset flow difference interval length value, , , , , , They are the current ambient pressure value, ambient pressure parameter value, current ambient noise value, ambient noise parameter value, current ambient vibration amplitude value, and ambient vibration amplitude parameter value in the set area of ​​the transported gas. , , They are the environmental pressure influence coefficient, environmental noise influence coefficient, and environmental vibration amplitude influence coefficient stored in the database respectively.

[0016] The present invention has the following beneficial effects: (1) The high-precision multi-channel gas control device for trace gas monitoring realizes precise switching and independent control of multi-channel gases through a circular sealed rotary connector and a ring array layout of several independent gas channels, effectively reducing the risk of cross-contamination between different gases. Specifically, the circular sealed rotary connector can quickly align with the target independent gas channel under the drive of a high-precision harmonic reduction stepper motor, and complete channel switching in conjunction with a high-frequency response solenoid valve and a high-airtightness one-way valve, thereby avoiding mutual interference of residual gases between channels. In addition, the channel purge process automatically performed by the purge module when switching channels can not only remove residual gases, but also efficiently replace them according to the calculated purge flow value and time. Through the combination of this structure and control method, the system can significantly reduce the pollution risks caused by channel switching in the trace gas monitoring scenario, thereby ensuring the accuracy and reliability of the monitoring data, and improving the overall stability and automation level of the device in the multi-channel gas monitoring, analysis and calibration process.

[0017] (2) The high-precision multi-channel gas control device for trace gas monitoring uses a temperature control module to monitor the temperature of the transported gas in real time and perform difference analysis. When the gas temperature deviates from the preset range, the system will calculate the corresponding gas temperature and adjust the output power based on multiple parameters such as turbulence intensity, particle concentration and ambient temperature, and promptly heat or cool the gas for compensation. This module not only takes into account the conventional temperature difference, but also introduces additional parameters such as ambient temperature, turbulence intensity and particle concentration for comprehensive analysis, so that it can more accurately identify the specific factors that cause gas temperature anomalies and improve the response speed and accuracy of temperature control. Since trace gas monitoring often has extremely high requirements for temperature stability, this module can significantly reduce the interference of temperature fluctuations on gas measurement results, so that the measurement results still have high credibility and repeatability in complex environments.

[0018] (3) The high-precision multi-channel gas control device for trace gas monitoring uses a flow control module to monitor the flow of the transported gas in real time and perform differential analysis. If the flow deviates from the set range, the gas flow adjustment output power is calculated through a comprehensive analysis of multiple dimensions such as ambient pressure, ambient noise, and ambient vibration amplitude, thereby correcting the flow in the shortest time. Compared with the traditional method of relying solely on flow difference for simple PID adjustment, it pays more attention to the identification and compensation of external disturbance factors, especially in application environments with unstable pressure, noise interference or large pipeline vibration. The output power can be adjusted in time to maintain a stable flow. For trace gas monitoring, any flow fluctuation will affect the measurement sensitivity and accuracy. The module can not only maintain the set flow, but also dynamically respond to environmental interference, thereby ensuring that the monitoring process remains highly accurate under different operating conditions.

[0019] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention is a structural block diagram of an air intake module in a high-precision multi-channel gas control device for trace gas monitoring.

[0021] Figure 2 The present invention is a structural block diagram of a circular sealed rotary connector in a high-precision multi-channel gas control device for trace gas monitoring.

[0022] Figure 3 The present invention is a flowchart of the specific steps of performing channel purging on a target independent gas path channel in a high-precision multi-channel gas control device for trace gas monitoring.

[0023] In the figure: 15, circular sealed rotary connector; 151, rotary bearing; 16, high-precision harmonic reduction stepper motor. DETAILED DESCRIPTION

[0024] See also Figure 1-3 The embodiment of the present invention provides a technical solution: a high-precision multi-channel gas control device for trace gas monitoring, comprising: an air intake module, a circular sealed rotary connector 15 is provided at one end of the air intake module, a rotary bearing 151 is arranged at the center of the circular sealed rotary connector 15, and a high-precision harmonic reduction stepper motor 16 is connected to one end of the rotary bearing 151; the air intake module comprises a plurality of independent air paths (8 to 16 in this embodiment, and the channels are expandable) arranged in a circular array; a purge module is connected to the output end of the circular sealed rotary connector 15, and when the independent air path is switched, the high-precision harmonic reduction stepper motor 16 drives the rotary bearing 151 to rotate the output end of the circular sealed rotary connector 15 to the target independent air path, and the purge module performs channel purge on the target independent air path.

[0025] The specific steps for performing channel purge on the target independent gas path channel are as follows: obtain the initial residual gas concentration value and the minimum target value of the residual gas concentration (whose value is not 0, for example 1%) in the target independent gas path channel; obtain the gas path channel volume value and the preset purge time of the target independent gas path channel, and perform a comprehensive analysis based on the initial residual gas concentration value and the minimum target value of the residual gas concentration in the target independent gas path channel to obtain the purge flow value of the target independent gas path channel; perform channel purge on the target independent gas path channel based on the purge flow value of the target independent gas path channel and the preset purge time.

[0026] The specific formula for calculating the purge flow value of the target independent gas channel is as follows: ;in, is the purge flow value of the target independent gas channel, is the purge efficiency coefficient stored in the database, is the gas channel volume value of the target independent gas channel, is the preset purge time, is the initial residual gas concentration value in the target independent gas channel, It is the minimum target value of residual gas concentration in the target independent gas channel.

[0027] It should be explained that the purge efficiency coefficient stored in the database The specific acquisition steps are as follows: first, conduct multiple groups of purge experiments on the gas circuit under standard conditions, and calculate the replacement efficiency of a single purge by measuring the residual gas concentration before and after the purge; then, perform statistical analysis on these experimental data to determine the average efficiency value under different flow rates, times and gas circuit conditions; then, store these calibrated efficiency coefficients in the database for the system to query and call according to specific working conditions in actual applications. This coefficient is measured experimentally and stored in the database after statistical normalization, and is used to reflect the actual effect of gas replacement during the purge process.

[0028] Each independent air path channel includes a stainless steel air inlet pipeline, and a high-frequency response solenoid valve is provided at the air inlet end of the stainless steel air inlet pipeline. The high-frequency response solenoid valve is used for the connection and closing control of the air paths of each channel. A high-air-tightness one-way valve is provided at one end of the high-frequency response solenoid valve. The high-air-tightness one-way valve is used to prevent backflow during ventilation.

[0029] Specifically, it also includes: a temperature control module arranged at the output end of the circular sealed rotary connector 15; the temperature control module is used to monitor the gas temperature of the conveyed gas in real time and take temperature control measures when the gas temperature is abnormal.

[0030] The specific steps of real-time monitoring of the gas temperature of the conveying gas and taking temperature control measures when the gas temperature is abnormal are as follows: obtaining the current gas temperature value of the conveying gas in real time, and performing difference analysis with the preset gas temperature target value to obtain the gas temperature difference of the conveying gas; judging whether the gas temperature difference of the conveying gas is within the preset temperature difference range; when the gas temperature difference of the conveying gas is outside the preset temperature difference range, it is regarded as abnormal gas temperature of the conveying gas, and the gas temperature adjustment output power of the temperature control module is analyzed; based on the gas temperature adjustment output power of the temperature control module, temperature control measures are taken for the conveying gas.

[0031] The specific steps for analyzing the gas temperature adjustment output power of the temperature control module are as follows: obtain the current state data and state parameter data of the conveying gas, the current state data includes the current turbulence intensity value and the current particle concentration value, and the state parameter data includes the turbulence intensity parameter value and the particle concentration parameter value; obtain the ambient temperature value and the ambient temperature parameter value in the set area of ​​the conveying gas, and conduct a comprehensive analysis based on the current gas temperature value of the conveying gas, the preset gas temperature target value, the current state data and the state parameter data to obtain the gas temperature adjustment output power of the temperature control module, which reflects the adjustment output power of the temperature control module to control the gas temperature.

[0032] The current gas temperature value may be measured and obtained by a temperature sensor (such as a thermocouple or RTD) installed in the gas path.

[0033] The gas temperature target value is preset in the control system.

[0034] The ambient temperature value can be measured and obtained by an ambient temperature sensor.

[0035] The ambient temperature parameter is pre-set in the control system.

[0036] The current turbulence intensity value can be obtained by measuring using a high-speed pressure sensor or a hot-wire anemometer.

[0037] The turbulence intensity parameter is the average turbulence value measured when the system is in a stable state (or without external disturbance).

[0038] The current particle concentration value can be obtained by detecting particles in the airflow using an online laser scattering instrument or an optical particle counter.

[0039] The particle concentration parameter value is obtained by measuring under conditions without abnormal interference or in a clean gas state.

[0040] The specific formula for calculating the gas temperature adjustment output power of the temperature control module is as follows: ;in, Adjust the output power for the gas temperature of the temperature control module, is the temperature control proportional coefficient stored in the database, is the current gas temperature value of the transported gas, The preset gas temperature target value for the conveying gas, is the ambient temperature value in the set area of ​​the conveying gas, It is the ambient temperature parameter value in the set area of ​​the conveying gas. is the ambient temperature influence coefficient stored in the database, is the current turbulence intensity value of the transported gas, is the turbulence intensity parameter of the transported gas, is the turbulence intensity influence coefficient stored in the database, is the current particle concentration value of the transported gas, is the particle concentration parameter of the transported gas, is the particle concentration influence coefficient stored in the database.

[0041] It should be explained that the temperature control proportional coefficient stored in the database The specific steps for obtaining are: by conducting multiple groups of experiments under different temperature set points, different gas flow rates and load conditions, recording the corresponding relationship between the temperature control output power and the actual temperature response, and then using regression analysis or least squares algorithms to fit the proportional coefficient that best reflects the system characteristics, and store it in the database after calibration, so that it can be directly called in the subsequent temperature control process to achieve precise adjustment.

[0042] Ambient temperature influence coefficient stored in the database , turbulence intensity influence coefficient , particle concentration influence coefficient The specific steps for obtaining are as follows: under the conditions of changing ambient temperature, turbulence intensity, and particle concentration, the system is tested one by one and the control effect deviation is recorded. By comparing and analyzing these deviation data or performing regression fitting, the quantitative relationship between each influencing coefficient and the control output is determined and the calibration is completed. Finally, these coefficients are written into the database for real-time call by the control algorithm to compensate for the influence of the external environment and fluid state on the temperature control accuracy.

[0043] The specific implementation example of calculating the gas temperature adjustment output power of the temperature control module is as follows, and the following data is available: The temperature control proportional coefficient stored in the database is approximately: 15.142.

[0044] The current gas temperature value of the transported gas is approximately: 32.537℃.

[0045] The preset gas temperature target value of the conveying gas is approximately: 30.952°C.

[0046] The ambient temperature value in the set area of ​​the conveying gas is approximately: 28.746℃.

[0047] The ambient temperature parameter value in the set area of ​​the conveying gas is approximately: 27.389℃.

[0048] The ambient temperature influence coefficient stored in the database is approximately: 0.231.

[0049] The current turbulence intensity value of the transported gas is approximately: 0.411.

[0050] The parameter value of the turbulence intensity of the transported gas is approximately: 0.389.

[0051] The turbulence intensity influence coefficient stored in the database is approximately: 0.167.

[0052] The current particle concentration value of the transported gas is approximately: 0.047.

[0053] The particle concentration parameter value of the conveying gas is approximately: 0.055.

[0054] The particle concentration influence coefficient stored in the database is approximately: 0.108.

[0055] Substituting the above data into the specific formula for calculating the gas temperature adjustment output power of the temperature control module, we get: The gas temperature adjustment output power of the temperature control module = 15.142 × (tanh ((32.537-30.952) / 30.952)) × (1 + 0.231 × ((28.746-27.389) / 27.389) + 0.167 × (0.411 / 0.389) + 0.108 × (0.047 / 0.055)) ≈ 0.994W.

[0056] In this implementation scheme, by establishing a temperature control logic based on real-time monitoring and multi-parameter feedback, the accuracy and response speed of gas temperature control are significantly improved. First, the system collects the temperature of the conveying gas in real time, and performs difference analysis with the preset target value. Combined with key parameters such as ambient temperature, turbulence intensity and particle concentration, the temperature control proportional coefficient and various environmental influence coefficients obtained in advance through multiple groups of experiments and regression fitting in the database are used to achieve rapid identification and accurate compensation of temperature anomalies. This design not only makes up for the shortcomings of traditional temperature control methods that ignore changes in the environment and flow state, but also can effectively eliminate the interference of external disturbances on temperature control accuracy by dynamically adjusting the temperature control output power, thereby ensuring the stability and reliability of monitoring data. Overall, this logic uses multi-parameter joint correction and database intelligent control, which not only improves the system's adaptability in complex environments, but also realizes precise control of the temperature control process, thereby providing a higher level of automation and detection accuracy for trace gas monitoring.

[0057] Specifically, it also includes: a flow control module arranged at the output end of the circular sealed rotary connector 15; the flow control module is used to monitor the gas flow of the conveyed gas in real time and take flow control measures when the gas flow is abnormal.

[0058] The specific steps of real-time monitoring of the gas flow of the conveying gas and taking flow control measures when the gas flow is abnormal are as follows: obtaining the current gas flow value of the conveying gas in real time, and performing difference analysis with the preset gas flow target value to obtain the gas flow difference of the conveying gas; judging whether the gas flow difference of the conveying gas is within the preset flow difference range; when the gas flow difference of the conveying gas is outside the preset flow difference range, it is regarded as an abnormal gas flow of the conveying gas, and the gas flow adjustment output power of the flow control module is analyzed; based on the gas flow adjustment output power of the flow control module, flow control measures are taken for the conveying gas.

[0059] The specific steps for analyzing the gas flow adjustment output power of the flow control module are as follows: obtain the current environmental state data and environmental state parameter data in the set area of ​​the conveying gas, the current environmental state data includes the current environmental pressure value, the current environmental noise value, and the current environmental vibration amplitude value, and the environmental state parameter data includes the environmental pressure parameter value, the environmental noise parameter value, and the environmental vibration amplitude parameter value; read the current gas flow value of the conveying gas and the preset gas flow target value, and conduct a comprehensive analysis in combination with the current environmental state data and environmental state parameter data in the set area of ​​the conveying gas to obtain the gas flow adjustment output power of the flow control module.

[0060] The current gas flow value can be measured and obtained using an online flow sensor (such as a mass flow meter or a differential pressure flow meter).

[0061] The gas flow target value is preset in the control system.

[0062] The current ambient pressure value can be obtained by measuring using a pressure sensor (such as a digital pressure transmitter).

[0063] The ambient pressure parameter is preset in the control system.

[0064] The current environmental noise value can be obtained by measuring with a sound level meter or a microphone.

[0065] The ambient noise parameter value refers to the ambient noise baseline value (reference value) pre-set (in the control system) within the set area of ​​gas transportation. It is used to evaluate whether the current ambient noise is within the normal range and whether it affects the gas flow control process.

[0066] The current environmental vibration amplitude value can be measured and obtained using an acceleration sensor or a vibration sensor (such as a MEMS accelerometer).

[0067] The ambient vibration amplitude parameter value is preset in the control system.

[0068] The specific formula for calculating the gas flow adjustment output power of the flow control module is as follows: ;in, Adjust the output power for the gas flow of the flow control module, is the flow control proportional coefficient stored in the database, is the current gas flow value of the transported gas, The preset gas flow target value for the transported gas. is the preset flow difference interval length value, The current ambient pressure value in the set area of ​​the transported gas. It is the ambient pressure parameter value in the set area of ​​the transported gas. is the environmental pressure influence coefficient stored in the database, is the current ambient noise value in the set area for conveying gas, It is the ambient noise parameter value in the set area where the gas is transported. is the environmental noise impact coefficient stored in the database, is the current environmental vibration amplitude value in the set area of ​​the conveying gas, It is the parameter value of the environmental vibration amplitude in the set area of ​​the conveying gas. It is the environmental vibration amplitude influence coefficient stored in the database.

[0069] It should be explained that the flow control proportional coefficient stored in the database The specific steps of obtaining are: by recording the corresponding relationship between the control output power and the flow deviation under different flow settings and actual measurement conditions and performing regression analysis, the coefficient parameters that can best fit the control response are obtained, and then the coefficients are stored in the database for direct call in subsequent flow control.

[0070] Environmental pressure influence coefficients stored in the database , Environmental noise impact coefficient , Environmental vibration amplitude influence coefficient The specific steps for obtaining are: conduct experiments on flow control and collect control deviation data under various environmental pressure, noise and vibration conditions, extract the influence weight of each environmental factor on flow control through comparative analysis or iterative regression, and finally write these influence coefficients into the database for the system to perform accurate compensation in complex environments.

[0071] In this implementation scheme, by real-time monitoring of the flow rate of the transported gas, and combining multiple parameters such as environmental pressure, noise and vibration, the flow control proportional coefficient and environmental impact coefficient pre-calibrated in the database are used to achieve accurate identification and dynamic compensation of flow anomalies. Specifically, after the system obtains the airflow data in real time, it is compared with the preset target value and flow difference interval. If the deviation exceeds the allowable range, the flow control module will conduct a comprehensive analysis of the current environmental pressure, noise and vibration status according to the coefficients stored in the database, and calculate the corresponding flow adjustment output power, so as to quickly take control measures to ensure that the transported gas flow remains stable. This method not only improves the sensitivity and response speed of flow control through multi-parameter feedback, but also can effectively offset the influence of external interference factors on flow measurement, greatly improving the adaptability and monitoring accuracy of the system in complex environments, and providing a more reliable and accurate technical guarantee for trace gas monitoring.

[0072] In summary, this application has at least the following effects: Through the circular sealed rotary connector and the annular array layout of several independent gas channels, precise switching and independent control of multi-channel gases are achieved, effectively reducing the risk of cross-contamination between different gases. Specifically, the circular sealed rotary connector, driven by a high-precision harmonic reduction stepper motor, can quickly align with the target independent gas channel, and cooperate with the high-frequency response solenoid valve and the high-airtightness one-way valve to complete the channel switching, avoiding the mutual interference of residual gases between channels. In addition, the channel purge process automatically performed by the purge module when switching channels can not only remove residual gases, but also efficiently replace them according to the calculated purge flow value and time. Through the combination of this structure and control method, the system can significantly reduce the pollution risks caused by channel switching in the trace gas monitoring scenario, thereby ensuring the accuracy and reliability of the monitoring data, and improving the overall stability and automation level of the device in the multi-channel gas monitoring, analysis and calibration process.

[0073] The temperature control module monitors the temperature of the transported gas in real time and performs difference analysis. When the gas temperature deviates from the preset range, the system will calculate the corresponding gas temperature to adjust the output power based on multiple parameters such as turbulence intensity, particle concentration and ambient temperature, and promptly compensate for the gas heating or cooling. This module not only takes into account the conventional temperature difference, but also introduces additional parameters such as ambient temperature, turbulence intensity and particle concentration for comprehensive analysis, so that it can more accurately identify the specific factors that cause abnormal gas temperature and improve the response speed and accuracy of temperature control. Since trace gas monitoring often has extremely high requirements for temperature stability, this module can significantly reduce the interference of temperature fluctuations on gas measurement results, so that the measurement results still have high credibility and repeatability in complex environments.

[0074] Through the flow control module, the flow of the transported gas is monitored in real time and the difference analysis is performed. If the flow deviates from the set range, the gas flow adjustment output power is calculated through a comprehensive analysis of multiple dimensions such as ambient pressure, ambient noise, and ambient vibration amplitude, so that the flow can be corrected in the shortest time. Compared with the traditional method of relying solely on flow difference for simple PID adjustment, it pays more attention to the identification and compensation of external disturbance factors, especially in application environments with unstable pressure, noise interference or large pipeline vibration. The output power can be adjusted in time to maintain a stable flow. For trace gas monitoring, any flow fluctuation will affect the measurement sensitivity and accuracy. The module can not only maintain the set flow, but also dynamically respond to environmental interference, thereby ensuring that the monitoring process remains highly accurate under different operating conditions.

[0075] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0076] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A high-precision multi-channel gas control device for trace gas monitoring, characterized in that: include: An air intake module, wherein a circular sealed rotary connector (15) is provided at one end of the air intake module, and the air intake module comprises a plurality of independent air passages arranged in a circular array; The output end of the circular sealed rotary connector (15) is connected to a purge module, and the purge module is used to perform channel purge on the target independent gas path channel when the output end of the circular sealed rotary connector rotates to the target independent gas path channel, and the specific steps are as follows: The initial residual gas concentration value in the target independent gas channel, the minimum target value of the residual gas concentration, the gas channel volume value of the target independent gas channel and the preset purge time are obtained, and a comprehensive analysis is performed to obtain the purge flow value of the target independent gas channel. The calculation formula is as follows: ； in, is the purge flow value of the target independent gas channel, is the purge efficiency coefficient stored in the database, is the gas channel volume value of the target independent gas channel, is the preset purge time, , They are, in order, the initial residual gas concentration value in the target independent gas path channel and the minimum target value of the residual gas concentration; Based on the purge flow value of the target independent gas channel and the preset purge time, channel purge is performed on the target independent gas channel.

2. The high-precision multi-channel gas control device for trace gas monitoring according to claim 1, characterized in that: Each independent air path channel comprises a stainless steel air inlet pipeline, a high-frequency response solenoid valve is arranged at the air inlet end of the stainless steel air inlet pipeline, and a high-air-tightness one-way valve is arranged at one end of the high-frequency response solenoid valve.

3. The high-precision multi-channel gas control device for trace gas monitoring according to claim 1, characterized in that: Also includes: A temperature control module arranged at the output end of the circular sealed rotary connector (15); The temperature control module is used to monitor the gas temperature of the transported gas in real time and take temperature control measures when the gas temperature is abnormal.

4. The high-precision multi-channel gas control device for trace gas monitoring according to claim 3, characterized in that: The specific steps for real-time monitoring of the gas temperature of the transported gas and taking temperature control measures when the gas temperature is abnormal are as follows: Acquire the current gas temperature value of the conveying gas in real time, and perform difference analysis with the preset gas temperature target value to obtain the gas temperature difference of the conveying gas; Determine whether the gas temperature difference of the conveying gas is within a preset temperature difference range; When the gas temperature difference of the conveying gas is outside the preset temperature difference range, it is regarded as the gas temperature of the conveying gas is abnormal, and the gas temperature of the temperature control module is analyzed to adjust the output power; The output power is adjusted based on the gas temperature of the temperature control module, and temperature control measures are taken for the transported gas.

5. The high-precision multi-channel gas control device for trace gas monitoring according to claim 4, characterized in that: The specific steps for analyzing the gas temperature of the temperature control module to adjust the output power are as follows: Acquire current state data and state parameter data of the conveying gas, wherein the current state data includes a current turbulence intensity value and a current particle concentration value, and the state parameter data includes a turbulence intensity parameter value and a particle concentration parameter value; The ambient temperature value and ambient temperature parameter value in the set area of ​​the conveying gas are obtained, and a comprehensive analysis is performed in combination with the current gas temperature value of the conveying gas, the preset gas temperature target value, the current state data and the state parameter data to obtain the gas temperature adjustment output power of the temperature control module.

6. The high-precision multi-channel gas control device for trace gas monitoring according to claim 5, characterized in that: The specific formula for calculating the gas temperature adjustment output power of the temperature control module is as follows: ； in, Adjust the output power for the gas temperature of the temperature control module, is the temperature control proportional coefficient stored in the database, , The following are the current gas temperature value of the transported gas and the preset gas temperature target value. , They are the ambient temperature value and ambient temperature parameter value in the set area of ​​the conveying gas. , , , They are the current turbulence intensity value of the transported gas, the turbulence intensity parameter value, the current particle concentration value, and the particle concentration parameter value. , , They are the ambient temperature influence coefficient, turbulence intensity influence coefficient, and particle concentration influence coefficient stored in the database respectively.

7. The high-precision multi-channel gas control device for trace gas monitoring according to claim 1, characterized in that: Also includes: A flow control module arranged at the output end of the circular sealed rotary connector (15); The flow control module is used to monitor the gas flow of the transported gas in real time and take flow control measures when the gas flow is abnormal.

8. The high-precision multi-channel gas control device for trace gas monitoring according to claim 7, characterized in that: The specific steps for real-time monitoring of the gas flow of the transported gas and taking flow control measures when the gas flow is abnormal are as follows: The current gas flow value of the conveying gas is obtained in real time, and a difference analysis is performed with the preset gas flow target value to obtain the gas flow difference of the conveying gas; Determine whether the gas flow difference of the conveying gas is within a preset flow difference range; When the gas flow difference of the transported gas is outside the preset flow difference range, it is considered that the gas flow of the transported gas is abnormal, and the gas flow of the flow control module is analyzed to adjust the output power; The output power is adjusted based on the gas flow of the flow control module, and flow control measures are taken for the transported gas.

9. The high-precision multi-channel gas control device for trace gas monitoring according to claim 8, characterized in that: The specific steps for analyzing the gas flow rate of the flow control module to adjust the output power are as follows: Acquire current environmental state data and environmental state parameter data in a set area for conveying gas, wherein the current environmental state data includes a current environmental pressure value, a current environmental noise value, and a current environmental vibration amplitude value, and the environmental state parameter data includes an environmental pressure parameter value, an environmental noise parameter value, and an environmental vibration amplitude parameter value; The current gas flow value of the conveying gas and the preset gas flow target value are read, and a comprehensive analysis is performed in combination with the current environmental state data and environmental state parameter data in the set area of ​​the conveying gas to obtain the gas flow adjustment output power of the flow control module.

10. The high-precision multi-channel gas control device for trace gas monitoring according to claim 9, characterized in that: The specific formula for calculating the gas flow adjustment output power of the flow control module is as follows: ； in, Adjust the output power for the gas flow of the flow control module, is the flow control proportional coefficient stored in the database, , The following are the current gas flow value of the transported gas and the preset gas flow target value. is the preset flow difference interval length value, , , , , , They are the current ambient pressure value, ambient pressure parameter value, current ambient noise value, ambient noise parameter value, current ambient vibration amplitude value, and ambient vibration amplitude parameter value in the set area of ​​the transported gas. , , They are the environmental pressure influence coefficient, environmental noise influence coefficient, and environmental vibration amplitude influence coefficient stored in the database respectively.

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