A pressure regulating cabinet for gas prevention and control

Abstract

The present application relates to the technical field of urban gas transmission and distribution, and particularly relates to a pressure regulating cabinet for gas prevention and control, which comprises a cabinet body, a gas main pipeline, a pressure regulator and a manual cut-off valve, and a core integrated time domain reflection type acoustic self-diagnosis unit and a variable resonance cavity whistle coding early warning unit, which are independently operated and constitute a double redundant prevention and control architecture. The acoustic self-diagnosis unit transmits coded acoustic waves and analyzes echo signals to realize real-time monitoring of the working condition of the cabinet and the near-end pipeline, abnormal positioning and type discrimination, and output linkage control signals; the whistle coding early warning unit is installed at the outlet of the diffuser pipe, and generates characteristic frequency whistle sound corresponding to the working condition by using airflow, without external power supply and electronic transmission module. The present application can be matched with intelligent linkage and centralized control modules to effectively improve the safety prevention and control reliability of the pressure regulating cabinet.

Description

Technical Field

[0001] This invention relates to the field of urban gas transmission and distribution technology, and more specifically, to a pressure regulating cabinet for gas control. Background Technology

[0002] This invention belongs to the field of urban gas transmission and distribution technology, specifically relating to the safety control technology of gas pressure regulating cabinets. Gas pressure regulating cabinets are core equipment in urban gas pipeline networks, responsible for pressure regulation and operational condition control. They are key nodes connecting transmission and distribution trunk lines to downstream users, and their operational stability and safety directly determine the reliability of urban gas supply and public safety.

[0003] Current safety control solutions for gas pressure regulators mostly employ electronic sensing devices such as pressure transmitters and combustible gas concentration sensors to monitor abnormal operating conditions. These monitoring solutions heavily rely on the stable operation of electronic sensors. However, outdoor installation scenarios for pressure regulators involve large temperature differences, significant humidity fluctuations, and complex gas compositions, which can easily lead to problems such as zero-point drift, catalytic poisoning, and sensitivity decay in the sensors, creating monitoring blind spots. Furthermore, they cannot accurately locate and identify early anomalies within the pipeline. In addition, existing monitoring and early warning systems all require external power supply and electronic data transmission links, making them prone to complete failure under conditions such as power outages, line faults, and extreme weather. They lack effective redundant early warning mechanisms and are unable to meet the high-level safety control requirements of urban gas transmission and distribution systems.

[0004] To address the numerous shortcomings of the existing technologies, this invention proposes a gas control pressure regulating cabinet with a dual-redundancy control architecture. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a pressure regulating cabinet for gas control.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A gas pressure regulating cabinet for gas control includes a cabinet body, a gas main pipeline located inside the cabinet body, a pressure regulator, and a manual shut-off valve; the pressure regulating cabinet integrates a time-domain reflective acoustic self-diagnostic unit and a variable resonant cavity whistle coding early warning unit.

[0008] The time-domain reflectometry acoustic self-diagnostic unit is used to actively transmit coded acoustic waves into the gas main pipeline, simultaneously collect echo signals in the pipeline and perform feature analysis, realize real-time monitoring of the working conditions inside the pressure regulating cabinet and the near-end pipeline, anomaly location and anomaly type identification, and output corresponding linkage control signals and alarm data.

[0009] The variable resonant cavity whistle coding early warning unit is installed at the outlet end of the vent pipe of the voltage regulator. It uses the airflow in the vent pipe to generate characteristic frequency whistles corresponding to different operating conditions of the voltage regulator, realizing the coding and self-reporting of operating conditions. This unit drives the resonant cavity length to adjust adaptively through the operating condition parameters of the voltage regulator. It does not require an external power supply and electronic data transmission module. It operates independently with the time-domain reflectometry acoustic self-diagnosis unit, together forming a dual redundancy prevention and control architecture for the voltage regulator.

[0010] Furthermore, the time-domain reflectometry acoustic self-diagnostic unit includes a miniature acoustic generator, an acoustic receiving sensor, a signal processing module, and a temperature acquisition submodule; the miniature acoustic generator and the acoustic receiving sensor are installed in pairs on the straight section of the gas main pipeline, the temperature probe of the temperature acquisition submodule is located inside the gas main pipeline, and the signal processing module is electrically connected to the miniature acoustic generator, the acoustic receiving sensor, and the temperature acquisition submodule respectively.

[0011] Furthermore, the signal processing module pre-stores a set of reference characteristic parameters of the pipeline's inherent structure echo under the reference operating conditions. The echo signal acquired in real time is filtered and compared with the reference characteristic parameter set to complete the identification, location and type determination of abnormal operating conditions.

[0012] Furthermore, the signal processing module performs real-time correction calculations on the sound velocity of the gas medium in the pipeline based on the gas temperature data obtained by the temperature acquisition submodule, which is used for anomaly point location calculations.

[0013] Furthermore, the variable resonant cavity whistle coding early warning unit includes an airflow nozzle, a variable resonant cavity, a movable cavity wall, multiple sets of working condition drive mechanisms, and a protective shell; the airflow nozzle is coaxially mounted at the outlet end of the vent pipe, with the nozzle outlet facing the cavity opening of the variable resonant cavity; the movable cavity wall is located at the closed end of the variable resonant cavity and can move along the cavity axis; the working condition drive mechanism is connected to the movable cavity wall in a transmission connection.

[0014] Furthermore, the operating condition drive mechanism includes a pressure drive component, a temperature drive component, and a leakage drive component. Each drive mechanism corresponds to different operating condition parameters and independently drives the movable cavity wall to move axially to adjust the effective length of the resonant cavity.

[0015] Furthermore, under different operating conditions, the resonant cavity of each drive mechanism is adjusted to a different effective length to generate characteristic frequency whistles that correspond one-to-one with normal operating conditions and various abnormal operating conditions and can be distinguished from each other, thus forming a standardized operating condition code.

[0016] Furthermore, the pressure regulating cabinet is also equipped with an intelligent linkage control unit, which is electrically connected to the time-domain reflectometry acoustic self-diagnostic unit and is used to receive the linkage control signal output by the time-domain reflectometry acoustic self-diagnostic unit and perform the gas source cut-off operation.

[0017] Furthermore, the voltage regulator cabinet is also equipped with a centralized management and control platform docking module. The centralized management and control platform docking module is connected to the time-domain reflectometry acoustic self-diagnosis unit and the intelligent linkage control unit, respectively, to realize the uploading of voltage regulator cabinet operation data and alarm information and remote management and control.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. This invention utilizes a time-domain reflectometry-based acoustic self-diagnostic unit, employing a technical solution of actively transmitting pseudo-randomly coded low-frequency acoustic waves and collecting and analyzing pipeline echo signals. This eliminates the need for traditional gas concentration sensors and pressure transmitters, fundamentally avoiding monitoring blind spots caused by electronic sensor drift and poisoning failure. By pre-calibrating a set of reference echo characteristic parameters of the pipeline's inherent structure and combining this with real-time correction of the medium's sound velocity based on gas temperature, the unit can achieve real-time identification, precise location, and type determination of abnormal operating conditions inside the pressure regulating cabinet and near-end pipelines. It simultaneously outputs linkage control signals, significantly improving the accuracy and timeliness of pressure regulating cabinet condition monitoring.

[0020] 2. This invention establishes a variable resonant cavity whistle coding early warning unit that is completely independent of the time-domain reflective acoustic self-diagnostic unit. It employs a passive design that uses operating condition parameters to drive adaptive adjustment of the resonant cavity length. This eliminates the need for external power supply and electronic data transmission modules; it generates characteristic frequency whistles corresponding to different operating conditions solely using the airflow within the venting tube, achieving coded self-reporting of operating conditions. This unit, together with the active acoustic self-diagnostic unit, forms a dual-redundancy prevention and control architecture. Even if the voltage regulator's electronic system completely fails, it can still stably provide early warnings of abnormal operating conditions, comprehensively improving the voltage regulator's safety and prevention capabilities under all scenarios and extreme operating conditions. Attached Figure Description

[0021] Figure 1 This is a structural diagram of a pressure regulating cabinet for gas control. Detailed Implementation

[0022] Example, refer to Figure 1 This embodiment of a gas control pressure regulating cabinet includes a cabinet body, a gas main pipeline located inside the cabinet body, a pressure regulator, a manual shut-off valve, and also integrates a time-domain reflective acoustic self-diagnostic unit, a variable resonant cavity whistle coding early warning unit, and optional supporting intelligent linkage control unit and centralized management platform docking module.

[0023] U1, Time Domain Reflection Acoustic Self-Diagnosis Unit: By actively emitting specially coded low-frequency acoustic waves, it collects echo signals in the pipeline and performs feature analysis to achieve real-time monitoring and anomaly location of the working conditions in the cabinet and near-end pipeline. It does not rely on traditional gas concentration sensors throughout the process, fundamentally avoiding the monitoring blind spots caused by sensor zero-point drift and poisoning failure.

[0024] S11. Unit Hardware Configuration and Installation:

[0025] The hardware configuration of this unit includes a miniature acoustic wave generator, an acoustic wave receiving sensor, a signal processing module, and a temperature acquisition sub-module. All hardware adopts an explosion-proof design to be compatible with the explosion-proof environment inside the voltage regulating cabinet.

[0026] The miniature acoustic wave generator and the acoustic wave receiving sensor are installed in pairs on the straight section of the main gas pipeline inside the pressure regulating cabinet. The installation position is selected on the straight section upstream of the pressure regulator inlet. The length of the straight section can be determined according to the nominal diameter of the pipeline. In some embodiments, a length of not less than 5 times the nominal diameter of the pipeline is selected to avoid interference from turbulence generated by pipeline bends and valves with the emission and propagation of sound waves. The transmitting end of the miniature acoustic wave generator faces the inside of the pipeline, and the receiving end of the acoustic wave receiving sensor is set coaxially with the direction of sound wave emission. The installation distance between the two can be determined according to the installation space. In some embodiments, a distance of not more than 0.3m is selected to reduce the time delay error caused by the installation position.

[0027] The temperature acquisition submodule's temperature probe is located inside the main pipeline, at the same axial section as the miniature sound wave generator, to collect the thermodynamic temperature of the gas inside the pipeline in real time for real-time correction calculation of the sound velocity.

[0028] The signal processing module is located in the explosion-proof junction box of the voltage regulating cabinet. It is electrically connected to the miniature acoustic wave generator, acoustic wave receiving sensor, and temperature acquisition submodule to complete the generation of encoded signals, transmission drive, echo signal acquisition and processing.

[0029] S12, Pre-calibration of baseline operating conditions:

[0030] To eliminate interference from fixed pipeline structures on echo signals and improve the accuracy of abnormal operating condition identification, baseline calibration must be completed before the system is officially put into operation. This step provides a signal comparison benchmark for subsequent real-time monitoring. The calibration implementation steps are as follows:

[0031] 1. Confirm that the pressure regulating cabinet is in normal working condition, the gas pressure and temperature in the pipeline are within the design rated range, and there are no abnormal conditions such as leakage or blockage.

[0032] 2. The signal processing module drives the miniature acoustic wave generator to emit preset coded low-frequency sound waves and simultaneously collects complete pipeline echo signals. The duration of a single acquisition covers the maximum time for the sound wave to travel back and forth in the pipeline within the monitoring range.

[0033] 3. Repeat the above acquisition steps at least 20 times, and perform average filtering on the acquired echo signals to obtain the reference echo signal.

[0034] 4. Extract the time delay, amplitude, and waveform features of all fixed peak values ​​in the reference echo signal, and mark them as echo features of the inherent structural components of the pipeline, such as welds, valves, and elbows. Store them in the local storage unit of the signal processing module as a comparison benchmark for subsequent anomaly identification, forming a benchmark feature parameter group.

[0035] S13. Real-time monitoring and anomaly identification:

[0036] This step achieves early identification and precise location of abnormal operating conditions through continuous sound wave emission, echo acquisition, and analysis. The specific implementation steps are as follows:

[0037] 1. Generating and transmitting encoded sound waves: The signal processing module generates low-frequency sound wave signals with pseudo-random codes. In some embodiments, m-sequence pseudo-random codes are used. The code length can be determined according to the monitoring distance, and the code width is matched with the period of the sound wave center frequency. The center frequency of the sound wave can be selected in the low-frequency band of 15Hz~30Hz according to the pipe material and monitoring distance to avoid the frequency band sensitive to human ears and the power frequency vibration and harmonics common in industrial environments. The signal processing module drives the miniature sound wave generator to transmit the above-mentioned encoded sound waves into the pipe according to the preset sampling period. The sampling period can be configured according to the monitoring requirements, and in some embodiments, it is selected as 10s~60s.

[0038] 2. Synchronous acquisition of echo signals: At the same time as the sound wave is emitted, the signal processing module synchronously acquires the echo signal in the pipe through the sound wave receiving sensor. The acquisition time is not less than the preset maximum propagation time, and the sampling frequency is not less than 10 times the center frequency of the sound wave to ensure sampling accuracy.

[0039] 3. Echo Signal Preprocessing: The signal processing module performs bandpass filtering on the acquired raw echo signal. In some embodiments, a finite-length unit impulse response filter is used. The filter order can be determined according to the filtering effect requirements. The passband range covers the frequency band above and below the center frequency of the transmitted sound wave by 10%, filtering out environmental noise and irrelevant vibration interference. The filtered echo signal sequence and the transmitted coded sound wave sequence are subjected to sliding cross-correlation calculation to obtain a cross-correlation function sequence. The cross-correlation operation is used to extract the effective echo component related to the transmitted code from the noisy echo signal and suppress unrelated environmental noise. The peak value in the sequence corresponds to the arrival time of the effective echo. The arrival time, peak amplitude and waveform characteristics of each peak point are recorded.

[0040] 4. Real-time correction calculation of sound velocity in the pipeline: To eliminate the influence of gas temperature changes on sound velocity and improve positioning accuracy, the real-time sound velocity of the gas medium in the pipeline is calculated based on the real-time collected gas temperature using the following formula:

[0041] ;

[0042] In the formula, The adiabatic index of the gas is 1.30 to 1.32 for town natural gas with methane as the main component. This is the universal gas constant, with a value of 8.314 J / (mol・K); The temperature of the gas inside the pipeline is measured in K, and is acquired in real time by the temperature acquisition submodule. Let be the molar mass of the gas; for urban natural gas, the value is taken as 0.016 kg / mol.

[0043] 5. System Inherent Delay Calibration: To eliminate fixed delay errors caused by hardware circuitry and sensor responses, the inherent delay is calibrated before the system leaves the factory. The calibration method involves selecting a standard steel pipe of known length, installing a miniature acoustic generator and an acoustic receiving sensor at the same end of the pipe, and sealing the other end. After transmitting coded acoustic waves, the echo signal is collected. Based on the theoretical values ​​of the known pipe length and echo arrival time, the delay deviation of multiple measurements is calculated, and the average value is taken as the system's inherent delay. , The value range is 0.1ms to 0.5ms;

[0044] 6. Abnormal Operating Condition Identification and Location: The extracted echo peak features are compared with a pre-calibrated set of reference feature parameters. If a new peak not present in the reference feature parameter set appears, or if the amplitude or waveform features of the existing peaks show distortion exceeding a preset threshold, an abnormal operating condition is identified. The preset threshold for amplitude distortion can be determined by multiples of the standard deviation of echo peak amplitudes acquired under the reference operating condition. In some embodiments, 3 to 5 times the standard deviation can be selected as the threshold. Based on the arrival time corresponding to the abnormal peak, the location distance of the abnormal point is calculated using the following formula:

[0045] ;

[0046] In the formula, The axial distance of the pipe from the abnormal point to the installation location of the sound wave generator is expressed in meters (m). The velocity of sound of the gas medium in the pipeline is calculated in real time, and the unit is m / s; The time of emission of the encoded sound wave is expressed in seconds (s). The echo arrival time corresponding to the abnormal peak value is expressed in seconds. This is the inherent system delay, measured in seconds, and is determined by factory calibration.

[0047] 7. Anomaly type identification: Based on the waveform distortion characteristics and auxiliary parameters of the abnormal echo, the anomaly type is identified: if the waveform of the newly added peak shows the characteristics of high frequency component attenuation and amplitude gradually decreasing over time, it is determined to be a pipeline leak; if the peak amplitude increases sharply beyond the preset threshold, it is determined to be a pipeline blockage or ice blockage; combined with the low temperature signal from the temperature acquisition submodule, ice blockage and conventional blockage conditions can be further distinguished.

[0048] 8. Linkage signal output: When a serious abnormal condition such as leakage or over-range blockage is detected, the signal processing module outputs an emergency cut-off signal to the intelligent linkage control unit and simultaneously uploads the abnormal data and positioning results to the centralized management and control platform.

[0049] U2, Variable Resonant Cavity Whistle Encoding Early Warning Unit: This unit requires no power supply or electronic data transmission module. It adaptively adjusts the cavity length based on the voltage regulator's operating parameters, generating characteristic frequency whistles corresponding to different operating conditions. This achieves redundant early warning under extreme conditions, ensuring stable self-reporting of operating conditions even if the voltage regulator's electronic system completely fails. This unit, together with the aforementioned time-domain reflectoacoustic self-diagnostic unit, forms a dual-redundancy control architecture. Both operate independently, without dependence on each other, jointly enhancing the safety and reliability of the voltage regulator.

[0050] S21. Unit Structure and Installation:

[0051] This unit is installed at the outlet of the vent pipe of the voltage regulator cabinet. It generates a whistle by utilizing the stable airflow in the vent pipe, without the need for an additional air source. It includes an airflow nozzle, a variable resonant cavity, a movable cavity wall, multiple working condition drive mechanisms, and a protective shell. All components are made of explosion-proof and corrosion-resistant materials, making it suitable for the operating environment of outdoor voltage regulator cabinets.

[0052] An airflow nozzle is coaxially mounted at the outlet end of the vent pipe, with the nozzle outlet facing the cavity opening of the variable resonant cavity. After passing through the nozzle, the airflow forms a stable jet, which excites the resonant cavity to produce a resonant whistle. The variable resonant cavity is a cylindrical cavity with one end open and the other end closed. The closed end is a movable cavity wall, and the effective length of the resonant cavity can be changed by moving the movable cavity wall along the cavity axis. Multiple sets of working condition drive mechanisms are respectively connected to the movable cavity wall for transmission. Each set of drive mechanisms corresponds to a working condition parameter and can independently drive the movable cavity wall to move according to the change of the working condition parameter, thereby changing the effective length of the cavity.

[0053] The operating condition drive mechanism includes a pressure drive component, a temperature drive component, and a leakage drive component. The pressure drive component adopts a pressure-bearing diaphragm and transmission rod structure. One side of the pressure-bearing diaphragm is connected to the gas main pipeline in the pressure regulating cabinet, and the other side is connected to the transmission rod. It can drive the movable cavity wall to move according to the pipeline pressure change. The effective area of ​​the pressure-bearing diaphragm and the transmission ratio of the transmission rod can be designed to match the rated pressure range and the target cavity length change, so that when the pipeline pressure changes within the rated range, the displacement of the movable cavity wall is linearly related to the pressure change. The temperature drive component adopts a stacked bimetallic strip structure. The fixed end of the bimetallic strip is connected to the cavity body, and the free end is connected to the movable cavity wall. It can drive the cavity length adjustment according to the ambient temperature change. The bimetallic strip can be selected with a bimetallic material corresponding to the difference in thermal expansion coefficient according to the target temperature trigger range, and will generate corresponding displacement when the temperature exceeds the preset range. The leakage drive component adopts a gas-sensitive shape memory alloy structure, which can drive the cavity length to adjust according to the change of gas concentration in the cabinet; the shape memory alloy can be selected from a shape memory alloy material that is sensitive to methane gas, and it will deform when the methane concentration in the environment reaches a preset trigger value, driving the movable cavity wall to move.

[0054] S22. Resonant Cavity Frequency Design and Operating Condition Coding:

[0055] This step, through the design of the effective length of the resonant cavity, maps different operating conditions to different characteristic frequencies, realizing the coded self-reporting of operating conditions. The specific implementation method is as follows:

[0056] 1. Basic calculation of resonant frequency: Based on the principle of open-tube acoustic resonance, the characteristic frequency of the whistle generated by the resonant cavity is calculated using the following formula:

[0057] ;

[0058] In the formula, The characteristic frequency of the whistle produced by the resonant cavity, in Hz; For harmonic orders, the fundamental frequency is selected under normal operating conditions. ; The speed of sound in ambient air is expressed in m / s, and is taken as 340 m / s at normal temperature and pressure. This is the effective cavity length of the resonant cavity, in meters (m). This is the nozzle correction amount, in meters, and is 0.6 to 0.8 times the inner diameter of the resonant cavity nozzle, determined by the acoustic calibration before leaving the factory.

[0059] 2. Reference frequency design under normal operating conditions: Under normal operating conditions, the gas pressure in the pressure regulating cabinet is within the rated design range, the temperature is between 5℃ and 40℃, there is no gas leakage, all operating conditions drive mechanisms are in the initial position, and the effective length of the resonant cavity is the reference length. The corresponding reference characteristic frequency can be determined according to design requirements. In some implementations, 440Hz can be selected as the identification frequency for normal operating conditions.

[0060] 3. Frequency coding design for abnormal operating conditions: For different abnormal operating conditions, the effective length of the resonant cavity is adjusted by the drive mechanism to generate characteristic frequencies that can be clearly distinguished from normal operating conditions and other abnormal operating conditions, forming a standardized operating condition code.

[0061] When an overpressure condition occurs in the pipeline, the pressure-driven component moves the movable cavity wall, adjusting the effective length of the resonant cavity to... The corresponding characteristic frequency is twice the reference frequency, which serves as the identification frequency for overpressure conditions.

[0062] When the pipeline experiences undervoltage or leakage, the leakage drive component moves the movable cavity wall, adjusting the effective length of the resonant cavity to... The corresponding characteristic frequency is half of the reference frequency, which serves as the identification frequency for undervoltage leakage conditions.

[0063] When low-temperature ice blockage occurs in the pipeline, the temperature-driven component moves the movable cavity wall, adjusting the effective length of the resonant cavity to... The corresponding characteristic frequency is 2 / 3 of the reference frequency, which serves as the identification frequency for ice blockage conditions.

[0064] 4. Frequency Identification and Early Warning Implementation: Inspection personnel can directly identify changes in the whistle frequency by ear to determine the operating condition of the voltage regulator cabinet; at the same time, the characteristic frequency whistle can be recorded by a regular mobile phone, and the frequency peak of the recorded signal can be extracted by fast Fourier transform and compared with the preset operating condition characteristic frequency to complete the operating condition identification; in the case of unattended operation at night, the whistle can be sensed by the acoustic receiving device of the adjacent voltage regulator cabinet or the surrounding smart sound column, forming a distributed acoustic network early warning.

[0065] U3, Intelligent Linkage Control Unit and Centralized Management Platform Interface Module:

[0066] This section contains optional supporting implementation details, used to achieve automatic handling and centralized management of abnormal operating conditions. It is based on existing mature intelligent control technology for gas pressure regulating cabinets. Only a brief description is provided here to ensure that those skilled in the art can fully implement this solution.

[0067] The intelligent linkage control unit includes a PLC control cabinet, an electric actuator, and an electromagnetic shut-off valve. The PLC control cabinet is electrically connected to the signal processing module of the time-domain reflectometry acoustic self-diagnostic unit and the electric actuator. When the signal processing module outputs an emergency shut-off signal, the PLC control cabinet immediately drives the electric actuator to close the electromagnetic shut-off valve, cutting off the gas supply and enabling rapid handling of abnormal operating conditions. The PLC control cabinet can be set to a maintenance interlock mode, which disables the automatic shut-off logic when authorized personnel are performing maintenance, preventing malfunctions.

[0068] The centralized management and control platform interface module adopts NB-IoT / 4G dual-mode wireless communication to upload real-time operating data, abnormal alarm information, and location results of the voltage regulator cabinet to the centralized management and control platform. This enables visualized centralized management of multiple voltage regulator cabinets, intelligent hierarchical alarms, remote parameter configuration, and multi-party collaborative handling, forming a closed-loop full-process management system for perception, analysis, and handling.

[0069] Through the detailed description of the above embodiments, the gas pressure regulating cabinet of the present invention integrates a time-domain reflectometry acoustic self-diagnostic unit and a variable resonant cavity whistle coding early warning unit, constructing a dual-redundant prevention and control architecture in which electronic active monitoring and passive acoustic early warning are independent and mutually backup. This invention breaks through the limitations of traditional pressure regulating cabinets that rely on electronic sensors for monitoring. It achieves accurate identification, location, and type determination of early anomalies such as internal pipeline leaks and blockages through acoustic time-domain reflectometry technology. Simultaneously, it solves the problem of early warning after electronic system failure under extreme operating conditions through passive variable resonant cavity acoustic coding technology. The supporting intelligent linkage control and centralized management platform interface module enables automatic shut-off and remote visual management of abnormal operating conditions, comprehensively improving the operational safety and prevention and control reliability of the gas pressure regulating cabinet. It can be widely adapted to new construction and safety upgrade scenarios of various pressure regulating cabinets in urban gas pipeline networks.

[0070] The preset parameters in the formula shall be set by those skilled in the art according to the actual situation.

[0071] The above embodiments can be implemented, in whole or in part, by software, hardware, firmware, or any other combination thereof. When implemented using software, the above embodiments can be implemented, in whole or in part, as a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more sets of available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. A semiconductor medium can be a solid-state drive.

[0072] It should be understood that in the various embodiments of this application, the order of the above-mentioned processes does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0073] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0074] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0075] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0076] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0077] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A pressure regulating cabinet for gas control, characterized in that, It includes a cabinet, a main gas pipeline located inside the cabinet, a pressure regulator, and a manual shut-off valve; the pressure regulator cabinet integrates a time-domain reflective acoustic self-diagnostic unit and a variable resonant cavity whistle encoding early warning unit; The time-domain reflectometry acoustic self-diagnostic unit is used to actively transmit coded acoustic waves into the gas main pipeline, simultaneously collect echo signals in the pipeline and perform feature analysis, realize real-time monitoring of the working conditions inside the pressure regulating cabinet and the near-end pipeline, anomaly location and anomaly type identification, and output corresponding linkage control signals and alarm data. The variable resonant cavity whistle coding early warning unit is installed at the outlet end of the vent pipe of the voltage regulator. It uses the airflow in the vent pipe to generate characteristic frequency whistles corresponding to different operating conditions of the voltage regulator, realizing the coding and self-reporting of operating conditions. This unit drives the resonant cavity length to adjust adaptively through the operating condition parameters of the voltage regulator. It does not require an external power supply and electronic data transmission module. It operates independently with the time-domain reflectometry acoustic self-diagnosis unit, together forming a dual redundancy prevention and control architecture for the voltage regulator.

2. A pressure regulating cabinet for gas control according to claim 1, characterized in that, The time-domain reflectometry acoustic self-diagnostic unit includes a miniature acoustic generator, an acoustic receiving sensor, a signal processing module, and a temperature acquisition submodule. The miniature acoustic generator and the acoustic receiving sensor are installed in pairs on a straight section of the gas main pipeline. The temperature probe of the temperature acquisition submodule is located inside the gas main pipeline. The signal processing module is electrically connected to the miniature acoustic generator, the acoustic receiving sensor, and the temperature acquisition submodule.

3. A pressure regulating cabinet for gas control according to claim 2, characterized in that, The signal processing module pre-stores a set of reference characteristic parameters for the inherent structure echo of the pipeline under the reference operating conditions. The echo signal acquired in real time is filtered and compared with the reference characteristic parameter set to complete the identification, location and type determination of abnormal operating conditions.

4. A pressure regulating cabinet for gas control according to claim 3, characterized in that, The signal processing module performs real-time correction calculations on the sound velocity of the gas medium in the pipeline based on the gas temperature data obtained by the temperature acquisition submodule, which is used for anomaly point location calculations.

5. A pressure regulating cabinet for gas control according to claim 1, characterized in that, The variable resonant cavity whistle coding early warning unit includes an airflow nozzle, a variable resonant cavity, a movable cavity wall, multiple sets of working condition drive mechanisms, and a protective shell. The airflow nozzle is coaxially mounted at the outlet end of the vent pipe, with the nozzle outlet facing the cavity opening of the variable resonant cavity. The movable cavity wall is located at the closed end of the variable resonant cavity and can move along the cavity axis. The working condition drive mechanism is connected to the movable cavity wall in a transmission manner.

6. A pressure regulating cabinet for gas control according to claim 5, characterized in that, The operating condition drive mechanism includes a pressure drive component, a temperature drive component, and a leakage drive component. Each drive mechanism corresponds to different operating condition parameters and independently drives the movable cavity wall to move axially to adjust the effective length of the resonant cavity.

7. A pressure regulating cabinet for gas control according to claim 6, characterized in that, Under different operating conditions, the resonant cavity of each drive mechanism is adjusted to a different effective length to generate characteristic frequency whistles that correspond one-to-one with normal operating conditions and various abnormal operating conditions and can be distinguished from each other, thus forming a standardized operating condition code.

8. A pressure regulating cabinet for gas control according to claim 1, characterized in that, The pressure regulating cabinet is also equipped with an intelligent linkage control unit, which is electrically connected to the time-domain reflectometry acoustic self-diagnostic unit. It is used to receive the linkage control signal output by the time-domain reflectometry acoustic self-diagnostic unit and perform the gas source cut-off operation.

9. A pressure regulating cabinet for gas control according to claim 8, characterized in that, The voltage regulator cabinet is also equipped with a centralized management and control platform interface module. The centralized management and control platform interface module is connected to the time-domain reflectometry acoustic self-diagnosis unit and the intelligent linkage control unit, respectively, to realize the uploading of voltage regulator cabinet operation data and alarm information and remote management and control.

Images