A high-precision multi-channel gas control device for trace gas monitoring

Abstract

The present invention discloses a high-precision multi-channel gas control device for trace gas monitoring, which relates to the technical field of gas control. The high-precision multi-channel gas control device for trace gas monitoring includes an intake module. One end of the intake module is provided with a circular sealed rotary connector. The intake module includes a plurality of independent gas path channels arranged in an annular array. The output end of the circular sealed rotary connector is connected to a purge module. In the present invention, driven by a high-precision harmonic reduction stepper motor, the circular sealed rotary connector can quickly align with the target independent gas path channel, and cooperate with a high-frequency response solenoid valve and a high-airtight check valve to complete channel switching, avoiding mutual interference of residual gases between channels. Coupled with the automatic channel purge process performed by the purge module when switching channels, it can not only remove residual gases, but also perform efficient replacement according to the calculated purge flow value and time.

Description

Technical Field

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

[0002] As the core supporting equipment of a trace gas monitoring analyzer, a high-precision multi-channel gas control device plays a key role in the automated performance index testing and long-term quality control guarantee. This device needs to achieve pollution-free, fast and stable control of the internal gas path, and 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 airtightness of the gas path is likely to cause micro air infiltration pollution, resulting in ppm-level or larger deviations in the concentration of the target gas; Second, there is a significant hysteresis phenomenon during the gas replacement process, and the dead volume of the residual gas accounts for a relatively large proportion, resulting in a significant extension of the response time of the analyzer; Third, the traditional flow channel design has dead corners and reflux interference of the residual gas, and the risk coefficient of cross-contamination is relatively high.

[0004] These technical defects not only cause an extension of the calibration period of the analyzer, but also lead to a decrease in the confidence level of the monitoring data. In the monitoring scenario of ppb-level ultra-low concentration gases, magnitude deviations may occur, directly affecting the decision-making accuracy in key fields such as environmental monitoring and industrial process control. Summary of the Invention

[0005] In view of the deficiencies of 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 realized through the following technical solutions: A high-precision multi-channel gas control device for trace gas monitoring, comprising: an intake module, one end of the intake module is provided with a circular sealed rotary connector, and the intake module includes a plurality of independent gas path channels arranged in an annular 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 purging on the target independent gas path channel when the output end of the circular sealed rotary connector rotates to the position of the target independent gas path channel. The specific steps are as follows: Obtain the initial residual gas concentration value, the lowest target value of the residual gas concentration, the gas path volume value of the target independent gas path channel, and the preset purge time in the target independent gas path channel, and perform comprehensive analysis to obtain the purge flow value of the target independent gas path channel. The calculation formula is as follows: ; where is the purge flow value of the target independent gas path channel, is the purge efficiency coefficient stored in the database, is the volume value of the gas path channel for the target independent gas path channel, is the preset purging time, 、 are the initial residual gas concentration value and the lowest target value of the residual gas concentration in the target independent gas path channel in sequence; Based on the purging flow rate value of the target independent gas path channel and the preset purging time, channel purging is performed on the target independent gas path channel.

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

[0008] Furthermore, it further 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 transported gas in real time and take temperature control measures when the gas temperature is abnormal.

[0009] Furthermore, the specific steps of monitoring the gas temperature of the transported gas in real time and taking temperature control measures when the gas temperature is abnormal are as follows: Obtain the current gas temperature value of the transported gas in real time, and perform difference analysis with the preset gas temperature target value to obtain the gas temperature difference of the transported gas; Determine whether the gas temperature difference of the transported gas is within the preset temperature difference range; When the gas temperature difference of the transported gas is outside the preset temperature difference range, it is regarded as the gas temperature of the transported gas being abnormal, 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 transported gas.

[0010] Furthermore, the specific steps of analyzing the gas temperature adjustment output power of the temperature control module are as follows: Obtain the current state data and state determination data of the transported gas, the current state data includes the current turbulence intensity value and the current particle concentration value, and the state determination data includes the turbulence intensity determination value and the particle concentration determination value; Obtain the ambient temperature value and ambient temperature determination value within the set area of the transported gas, and perform comprehensive analysis in combination with the current gas temperature value, preset gas temperature target value, current state data and state determination data of the transported gas 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: ; where, is the gas temperature adjustment output power of the temperature control module, is the temperature control proportionality coefficient stored in the database, 、 They are, in sequence, the current gas temperature value of the conveyed gas and the preset gas temperature target value. , They are, in sequence, the ambient temperature value and the ambient temperature reference value within the set area of the conveyed gas. , , , They are, in sequence, the current turbulence intensity value, the turbulence intensity reference value, the current particle concentration value, and the particle concentration reference value of the conveyed gas. , , They are, in sequence, the ambient temperature influence coefficient, the turbulence intensity influence coefficient, and the particle concentration influence coefficient stored in the database.

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

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

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

[0015] Furthermore, the specific formula for calculating the gas flow rate adjustment output power of the flow rate regulation module is as follows: ; where is the gas flow rate adjustment output power of the flow rate regulation module, is the flow rate control proportionality coefficient stored in the database. , They are, in sequence, the current gas flow value of the transported gas, the preset gas flow target value, is the preset length value of the flow difference interval, , , , , , They are, in sequence, the current ambient pressure value, the ambient pressure reference value, the current ambient noise value, the ambient noise reference value, the current ambient vibration amplitude value, and the ambient vibration amplitude reference value within the set area of the transported gas, , , They are, in sequence, the ambient pressure influence coefficient, the ambient noise influence coefficient, and the ambient vibration amplitude influence coefficient stored in the database.

[0016] The present invention has the following beneficial effects:

[0017] (1). The high-precision multi-channel gas control device for trace gas monitoring realizes the precise switching and independent control of multi-channel gases through the circular sealed rotary connector and the annular array layout of several independent gas path channels, effectively reducing the risk of cross-contamination between different gases. Specifically, driven by the high-precision harmonic reduction stepping motor, the circular sealed rotary connector can quickly align with the target independent gas path channel, and cooperate with the high-frequency response solenoid valve and the high-airtight one-way valve to complete the channel switching, avoiding the mutual interference of the residual gases between channels. Coupled with the automatic channel purging process performed by the purging module when switching channels, it can not only remove the residual gases, but also perform efficient replacement according to the calculated purging flow value and time. Through the combination of this structure and control method, the system can significantly reduce the pollution hidden danger 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 processes.

[0018] (2) The high-precision multi-channel gas control device for trace gas monitoring monitors the temperature of the transported gas in real time through the temperature control module and conducts difference analysis. When the gas temperature deviates from the preset range, the system calculates the corresponding output power for gas temperature adjustment based on various parameters such as turbulence intensity, particle concentration, and ambient temperature, and compensates for the gas heating or cooling in a timely manner. This module not only considers the conventional temperature difference, but also additionally introduces the reference values of ambient temperature, turbulence intensity, and particle concentration for comprehensive analysis, so as to more accurately identify the specific factors causing abnormal gas temperature, improve the response speed and accuracy of temperature control. Since the monitoring of trace gases 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.

[0019] (3) The high-precision multi-channel gas control device for trace gas monitoring monitors the flow rate of the transported gas in real time through the flow rate control module and conducts difference analysis. If the flow rate deviates from the set range, the output power for gas flow rate adjustment is calculated through comprehensive analysis in multiple dimensions such as ambient pressure, ambient noise, and ambient vibration amplitude, so as to correct the flow rate in the shortest time. Compared with the traditional method that only relies on flow rate 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, it can adjust the output power in a timely manner to maintain a stable flow rate. For the monitoring of trace gases, any flow rate fluctuation will affect the measurement sensitivity and accuracy. This module can not only maintain the set flow rate, but also dynamically respond to environmental disturbances, so as to ensure that the monitoring process still maintains a high degree of accuracy under different operating conditions.

[0020] Of course, it is not necessary for any product implementing the present invention to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural block diagram of the intake module in a high-precision multi-channel gas control device for trace gas monitoring according to the present invention.

[0022] Figure 2 It is a structural block diagram of the circular sealed rotary connector in a high-precision multi-channel gas control device for trace gas monitoring according to the present invention.

[0023] Figure 3 It is a specific step flow chart for performing channel purging on the target independent gas path channel in a high-precision multi-channel gas control device for trace gas monitoring according to the present invention.

[0024] In the figure: 15. Circular sealed rotary connector; 151. Rotary bearing; 16. High-precision harmonic reduction stepping motor. Detailed implementation mode

[0025] Please refer to Figures 1-3 , an embodiment of the present invention provides a technical solution: a high-precision multi-channel gas control device for trace gas monitoring, including: an intake module, one end of the intake module is provided with a circular sealed rotary connector 15, a rotary bearing 151 is arranged at the center of the circular sealed rotary connector 15, and one end of the rotary bearing 151 is connected to a high-precision harmonic reduction stepping motor 16; the intake module includes a plurality of (8-16 in this embodiment, the channels can be expanded) independent gas path channels arranged in an annular array; the output end of the circular sealed rotary connector 15 is connected to a purge module. When switching the independent gas path channels, the high-precision harmonic reduction stepping motor 16 drives the rotary bearing 151 to rotate the output end of the circular sealed rotary connector 15 to the target independent gas path channel, and the purge module performs channel purging on the target independent gas path channel.

[0026] The specific steps of performing channel purging on the target independent gas path channel are as follows: Obtain the initial residual gas concentration value and the lowest target value of the residual gas concentration (its value is not 0, for example, 1%) in the target independent gas path channel; obtain the gas path volume value of the target independent gas path channel and the preset purging time, and perform comprehensive analysis in combination with the initial residual gas concentration value and the lowest target value of the residual gas concentration in the target independent gas path channel to obtain the purging flow rate value of the target independent gas path channel; based on the purging flow rate value of the target independent gas path channel and the preset purging time, perform channel purging on the target independent gas path channel.

[0027] The specific formula for calculating the purging flow rate value of the target independent gas path channel is as follows: ; where is the purging flow rate value of the target independent gas path channel, is the purging efficiency coefficient stored in the database, is the gas path volume value of the target independent gas path channel, is the preset purging time, is the initial residual gas concentration value in the target independent gas path channel, is the lowest target value of the residual gas concentration in the target independent gas path channel.

[0028] It should be explained that the purging efficiency coefficient stored in the database The specific acquisition steps are as follows: First, conduct multiple groups of purging experiments on the gas path under standard conditions. By measuring the residual gas concentration before and after purging, calculate the replacement efficiency of a single purging. Then, statistically analyze these experimental data to determine the average efficiency values under different flow rates, times, and gas path conditions. Next, store these calibrated efficiency coefficients in the database for the system to query and call according to the specific working conditions in actual applications. This coefficient is stored in the database after being experimentally determined, statistically analyzed, and normalized, and is used to reflect the actual effect of gas replacement during the purging process.

[0029] Each independent gas path channel includes a stainless-steel intake pipeline. A high-frequency response solenoid valve is provided at the intake end of the stainless-steel intake pipeline. The high-frequency response solenoid valve is used to control the connection and closure of each channel's gas path. A high-airtightness one-way valve is provided at one end of the high-frequency response solenoid valve, and the high-airtightness one-way valve is used to prevent backflow during the ventilation process.

[0030] Specifically, it further includes: a temperature control module provided at the output end of the circular sealed rotary connector 15; the temperature control module is used to continuously monitor the gas temperature of the transported gas and take temperature control measures when the gas temperature is abnormal.

[0031] The specific steps for continuously monitoring the gas temperature of the transported gas and taking temperature control measures when the gas temperature is abnormal are as follows: Continuously obtain the current gas temperature value of the transported gas, and perform a difference analysis with the preset gas temperature target value to obtain the gas temperature difference of the transported gas; determine whether the gas temperature difference of the transported gas is within the preset temperature difference range; when the gas temperature difference of the transported gas is outside the preset temperature difference range, it is regarded as the gas temperature of the transported gas being abnormal, and analyze the gas temperature adjustment output power of the temperature control module; based on the gas temperature adjustment output power of the temperature control module, take temperature control measures for the transported gas.

[0032] 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 determination data of the transported gas. The current state data includes the current turbulence intensity value and the current particle concentration value, and the state determination data includes the turbulence intensity reference value and the particle concentration reference value; obtain the environmental temperature value and the environmental temperature reference value within the set area of the transported gas, and perform a comprehensive analysis in combination with the current gas temperature value of the transported gas, the preset gas temperature target value, the current state data, and the state determination data to obtain the gas temperature adjustment output power of the temperature control module. This gas temperature adjustment output power reflects the adjustment output power of the temperature control module for controlling the gas temperature.

[0033] Among them, the current gas temperature value can be measured and obtained through a temperature sensor (such as a thermocouple or RTD) installed in the gas path.

[0034] The target value of the gas temperature is preset in the control system.

[0035] The ambient temperature value can be measured and obtained through an ambient temperature sensor.

[0036] The reference value of the ambient temperature is preset in the control system.

[0037] The current turbulence intensity value can be measured and obtained by using a high-speed pressure sensor or a hot-wire anemometer.

[0038] The reference value of the turbulence intensity is the average turbulence value measured under the stable state of the system (or without external disturbances).

[0039] The current particle concentration value can be detected and obtained by using an online laser scattering instrument or an optical particle counter to detect the particles in the air flow.

[0040] The reference value of the particle concentration is measured under the condition of no abnormal interference or in the state of clean gas.

[0041] The specific formula for calculating the output power of the gas temperature adjustment of the temperature control module is as follows: ; where is the output power of the gas temperature adjustment 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, is the preset target value of the gas temperature of the transported gas, is the ambient temperature value within the set area of the transported gas, is the reference value of the ambient temperature within the set area of the transported gas, is the ambient temperature influence coefficient stored in the database, is the current turbulence intensity value of the transported gas, is the reference value of the turbulence intensity 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 reference value of the particle concentration of the transported gas, is the particle concentration influence coefficient stored in the database.

[0042] It should be noted that the specific acquisition steps of the temperature control proportional coefficient stored in the database are as follows: Through multiple groups of experiments under different temperature set points, different gas flow rates and load conditions, record the corresponding relationship between the temperature control output power and the actual temperature response, and then use algorithms such as regression analysis or the least squares method to fit the proportional coefficient that best reflects the system characteristics, calibrate it and store it in the database for direct call in the subsequent temperature control process to achieve precise adjustment.

[0043] Environmental temperature influence coefficient stored in the database , Turbulence intensity influence coefficient , Particle concentration influence coefficient The specific acquisition steps are as follows: Under the conditions of the environmental temperature, turbulence intensity, and particle concentration changing respectively, the system conducts tests one by one and records the control effect deviation. By comparing and analyzing or regression fitting these deviation data, the quantitative relationship between each influence coefficient and the control output is determined and 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.

[0044] The specific implementation example of calculating the gas temperature adjustment output power of the temperature control module is as follows. The following data are available:

[0045] The temperature control proportional coefficient stored in the database is approximately: 15.142.

[0046] The current gas temperature value of the conveyed gas is approximately: 32.537 °C.

[0047] The preset gas temperature target value of the conveyed gas is approximately: 30.952 °C.

[0048] The environmental temperature value within the set area of the conveyed gas is approximately: 28.746 °C.

[0049] The reference environmental temperature value within the set area of the conveyed gas is approximately: 27.389 °C.

[0050] The environmental temperature influence coefficient stored in the database is approximately: 0.231.

[0051] The current turbulence intensity value of the conveyed gas is approximately: 0.411.

[0052] The reference turbulence intensity value of the conveyed gas is approximately: 0.389.

[0053] The turbulence intensity influence coefficient stored in the database is approximately: 0.167.

[0054] The current particle concentration value of the conveyed gas is approximately: 0.047.

[0055] The reference particle concentration value of the conveyed gas is approximately: 0.055.

[0056] The particle concentration influence coefficient stored in the database is approximately: 0.108.

[0057] Substitute the above data into the specific formula for calculating the gas temperature adjustment output power of the temperature control module respectively, and we get:

[0058] The output power of the gas temperature adjustment 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.

[0059] 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 transported gas in real time and conducts a difference analysis with the preset target value. Combining key parameters such as ambient temperature, turbulence intensity, and particle concentration, the temperature control proportional coefficient and each environmental influence coefficient obtained through multiple experiments and regression fitting in the database in advance are used to achieve rapid identification and precise compensation of temperature anomalies. Such a design not only makes up for the deficiencies 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 the temperature control accuracy by dynamically adjusting the output power of the temperature control. Ensure the stability and reliability of the monitoring data. Generally speaking, this logic uses multi-parameter joint calibration and database intelligent control, which not only improves the adaptability of the system in complex environments but also realizes precise control of the temperature control process, thus providing a higher level of automation and detection accuracy for trace gas monitoring.

[0060] Specifically, it further includes: a flow rate control module provided at the output end of the circular sealed rotary connector 15; the flow rate control module is used to monitor the gas flow rate of the transported gas in real time and take flow rate control measures when the gas flow rate is abnormal.

[0061] The specific steps of monitoring the gas flow rate of the transported gas in real time and taking flow rate control measures when the gas flow rate is abnormal are as follows: Obtain the current gas flow rate value of the transported gas in real time and conduct a difference analysis with the preset gas flow rate target value to obtain the gas flow rate difference of the transported gas; Determine whether the gas flow rate difference of the transported gas is within the preset flow rate difference range; When the gas flow rate difference of the transported gas is outside the preset flow rate difference range, it is regarded as an abnormal gas flow rate of the transported gas, and the output power of the gas flow rate adjustment of the flow rate control module is analyzed; Based on the output power of the gas flow rate adjustment of the flow rate control module, take flow rate control measures for the transported gas.

[0062] The specific steps for the gas flow regulation module to adjust the output power according to the gas flow are as follows: Obtain the current environmental state data and the specified environmental state data within the set area of the transported gas. The current environmental state data includes the current environmental pressure value, the current environmental noise value, and the current environmental vibration amplitude value. The specified environmental state data includes the specified environmental pressure value, the specified environmental noise value, and the specified environmental vibration amplitude value; Read the current gas flow value of the transported gas and the preset gas flow target value, and conduct a comprehensive analysis in combination with the current environmental state data and the specified environmental state data within the set area of the transported gas to obtain the output power of the gas flow regulation module for gas flow adjustment.

[0063] Among them, the current gas flow value can be measured and obtained by using an on-line flow sensor (such as a mass flowmeter or a differential pressure flowmeter).

[0064] The gas flow target value is preset in the control system.

[0065] The current environmental pressure value can be measured and obtained by using a pressure sensor (such as a digital pressure transmitter).

[0066] The specified environmental pressure value is preset in the control system.

[0067] The current environmental noise value can be measured and obtained by using a sound level meter or a microphone.

[0068] The specified environmental noise value refers to the specified environmental noise reference value (reference value) preset in the control system within the set area of the transported gas, which is used to evaluate whether the current environmental noise is within the normal range and whether it affects the gas flow regulation process.

[0069] The current environmental vibration amplitude value can be measured and obtained by using an acceleration sensor or a vibration sensor (such as a MEMS accelerometer).

[0070] The specified environmental vibration amplitude value is preset in the control system.

[0071] Among them, the specific formula for calculating the output power of the gas flow regulation module for gas flow adjustment is as follows: ; where is the output power of the gas flow regulation module for gas flow adjustment, is the flow control proportionality coefficient stored in the database, is the current gas flow value of the transported gas, is the preset gas flow target value of the transported gas, is the preset length value of the flow difference interval, is the current environmental pressure value within the set area of the transported gas, is the specified environmental pressure value within the set area of the transported gas, is the environmental pressure influence coefficient stored in the database, is the current environmental noise value within the set area for the transported gas, is the reference value of environmental noise within the set area for the transported gas, is the environmental noise influence coefficient stored in the database, is the current environmental vibration amplitude value within the set area for the transported gas, is the reference value of environmental vibration amplitude within the set area for the transported gas, is the environmental vibration amplitude influence coefficient stored in the database.

[0072] It should be noted that the specific steps for obtaining the flow control proportionality coefficient stored in the database are as follows: 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 optimally fit the control response are obtained, and then this coefficient is stored in the database for direct call in subsequent flow regulation.

[0073] The environmental pressure influence coefficient , the environmental noise influence coefficient , and the environmental vibration amplitude influence coefficient stored in the database are obtained through the following steps: Under various environmental pressure, noise, and vibration conditions, experiments on flow regulation are respectively carried out and the regulation deviation data are collected. By comparative analysis or iterative regression, the influence weights of each environmental factor on flow control are extracted, and finally these influence coefficients are written into the database for the system to perform precise compensation in a complex environment.

[0074] In this implementation plan, by real-time monitoring the flow rate of the transported gas and combining multiple parameters such as environmental pressure, noise, and vibration, and using the flow control proportionality coefficient and environmental influence coefficients pre-calibrated in the database, precise identification and dynamic compensation of flow anomalies are achieved. Specifically, after the system obtains the airflow data in real time, it compares it with the preset target value and the flow difference interval. If the deviation exceeds the allowable range, the flow regulation module comprehensively analyzes the current environmental pressure, noise, and vibration states according to the coefficients stored in the database, and calculates the corresponding flow adjustment output power, thereby quickly taking regulation measures to ensure the stability of the flow rate of the transported gas. This method not only improves the sensitivity and response speed of flow regulation through multi-parameter feedback, but also effectively offsets the influence of external interference factors on flow measurement, greatly enhancing the adaptability and monitoring accuracy of the system in a complex environment, providing a more reliable and precise technical guarantee for trace gas monitoring.

[0075] In summary, this application has at least the following effects:

[0076] Through the circular sealed rotary connector and the annular array layout of several independent gas path channels, the precise switching and independent control of multi-channel gases are realized, effectively reducing the risk of cross-contamination between different gases. Specifically, driven by a high-precision harmonic reduction stepper motor, the circular sealed rotary connector can quickly align with the target independent gas path channel, and cooperate with a high-frequency response solenoid valve and a high-airtight one-way valve to complete the channel switching, avoiding the mutual interference of the residual gases between channels. Coupled with the automatic channel purging process executed by the purging module during channel switching, it can not only remove the residual gases, but also perform efficient replacement according to the calculated purging flow value and time. Through the combination of this structure and control method, the system can significantly reduce the pollution hazards 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 during the multi-channel gas monitoring, analysis and calibration processes.

[0077] The temperature regulation module monitors the temperature of the transported gas in real time and conducts difference analysis. When the gas temperature deviates from the preset range, the system will calculate the corresponding output power for gas temperature adjustment according to various parameters such as turbulence intensity, particle concentration and ambient temperature, and heat or cool the gas in time. This module not only considers the conventional temperature difference, but also additionally introduces the reference values of ambient temperature, turbulence intensity and particle concentration for comprehensive analysis, so as to be able to more accurately identify the specific factors causing abnormal gas temperature, and improve the response speed and accuracy of temperature regulation. Since the monitoring of trace gases often has extremely high requirements for temperature stability, this module can significantly reduce the interference of temperature fluctuations on the gas measurement results, so that the measurement results still have high credibility and repeatability in complex environments.

[0078] Through the flow regulation module, the flow rate of the transported gas is monitored in real time and difference analysis is carried out. If the flow rate deviates from the set range, the output power for gas flow adjustment is calculated through comprehensive analysis in multiple dimensions such as ambient pressure, ambient noise and ambient vibration amplitude, so as to correct the flow rate in the shortest time. Compared with the traditional method that only relies on the flow difference for simple PID regulation, it pays more attention to the identification and compensation of external disturbance factors. Especially in the application environment with unstable pressure, noise interference or large pipeline vibration, the output power can be adjusted in time to maintain a stable flow rate. For the monitoring of trace gases, any flow rate fluctuation will affect the measurement sensitivity and accuracy, and this module can not only maintain the set flow rate, but also dynamically respond to environmental disturbances, thereby ensuring that the monitoring process still maintains a high degree of accuracy under different operating conditions.

[0079] Although the preferred embodiments of the present invention have been described, additional changes and modifications can be made to these embodiments by those skilled in the art once they learn of the basic inventive concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications that fall within the scope of the present invention.

[0080] 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 equivalent technologies, 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, performing channel purge on the target independent gas channel; 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 transported gas in real time and take flow control measures when the gas flow is abnormal. The specific steps 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 conveying gas is outside the preset flow difference range, it is considered that the gas flow of the conveying gas is abnormal, and the gas flow adjustment output power of the flow control module is analyzed. The specific steps 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. The specific formula 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 in order; 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.

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.

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