Fan control and disaster prevention equipment linkage system of tunnel and control method of fan control and disaster prevention equipment linkage system

Abstract

The invention relates to the technical field of tunnel safety control, in particular to a tunnel fan control and disaster prevention equipment linkage system and a control method thereof.The system comprises a data acquisition module, an execution module and a comprehensive control module; the jet fan is controlled to operate according to a preset standard smoke exhaust strategy; calculating a hydraulic pressing efficiency index; when it is judged that the fire-fighting water system has the risk that the fire-fighting water system is about to fail or the pressing capacity is insufficient, the jet fan is controlled to be switched to a heat extraction compensation mode from a standard smoke extraction strategy; according to the method, the hydraulic pressing efficiency index containing the pressure trend term and the vibration penalty term is calculated in real time, when the hydraulic pressing efficiency index is decreased to be below the threshold value, the jet fan is forcibly controlled to operate at the rated highest frequency, high-temperature flue gas accumulated on the tunnel vault can be rapidly taken away, and the tunnel vault is protected. Therefore, the tunnel concrete structure is effectively prevented from bursting, peeling and even collapsing due to bearing ultrahigh temperature for a long time.

Description

Technical Field

[0001] This invention relates to the field of tunnel safety control technology, specifically to a tunnel ventilation fan control and disaster prevention equipment linkage system and its control method, which is particularly applicable to the field of electromechanical control and disaster prevention and rescue in highway tunnels. Background Technology

[0002] As enclosed and narrow spaces, highway tunnels are directly affected by their ventilation and fire emergency response, impacting operational safety. Existing tunnel ventilation control systems mostly employ a single mode, relying on simple parameter triggers and lacking a tiered early warning mechanism for non-fire conditions. Furthermore, the linkage between ventilation control and fire prevention equipment (such as fire-fighting facilities, traffic guidance devices, and emergency notification systems) is poor, requiring manual operation of each component during a fire, resulting in low emergency response efficiency and potential delays in optimal response times.

[0003] In existing tunnel disaster prevention and control logic, when a fire detector or manual alarm button triggers a fire signal, the monitoring system typically activates the corresponding disaster prevention plan. For the ventilation system, the conventional control strategy is to activate the jet fan upstream of the fire point to create a critical wind speed that prevents smoke backflow, thereby forming a smoke-free zone downstream of the fire point and assisting in personnel evacuation by maintaining the stratification stability of the smoke layer. Simultaneously, the fire-fighting linkage system will activate the fire pumps to supply water to the fire hydrants or water spray systems in the tunnel to suppress the fire source.

[0004] However, in current engineering practice, tunnel ventilation control subsystems and fire water supply subsystems often operate in parallel and independently. The control logic of the fans mainly determines their start / stop or speed based on the presence or absence of fire signals and environmental parameters, and is statically set. Although existing Internet of Things (IoT) technology can monitor the operating status of electromechanical equipment such as pumps (e.g., current, voltage, vibration), this monitoring data is currently mainly used for routine equipment inspections, fault alarms, and maintenance records, which are applications at the equipment operation and maintenance level.

[0005] In actual fire conditions, fire water supply systems may fail to meet design requirements due to factors such as aging and ruptured pipes, mechanical failures of pumps (e.g., impeller cavitation, bearing seizure), or abnormal power supply. Under current technology, ventilation control systems lack a real-time sensing and feedback mechanism for the actual pressure suppression efficiency of the fire water system. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a tunnel ventilation fan control and disaster prevention equipment linkage system and its control method, which realizes coordinated response of ventilation fans and disaster prevention equipment under fire conditions.

[0007] This invention is achieved through the following technical solution:

[0008] A tunnel ventilation fan control and disaster prevention equipment linkage system includes:

[0009] The data acquisition and monitoring module is used to collect environmental parameters inside the tunnel in real time and to collect the operating status parameters of the fire water system; the operating status parameters include at least the mechanical vibration parameters and electrical performance parameters of the water pump.

[0010] The execution module includes a jet fan for tunnel ventilation and smoke extraction and a fire pump for fire suppression;

[0011] The integrated control module is communicatively connected to both the data acquisition and monitoring module and the execution module.

[0012] The integrated control module is configured as follows:

[0013] Upon receiving a fire signal, the system enters fire control mode and executes the following control logic: controls the fire pump to start and controls the jet fan to operate according to a preset standard smoke exhaust strategy; calculates the hydraulic suppression efficiency index in real time based on the operating status parameters.

[0014] The hydraulic suppression efficiency index is compared with a preset efficiency threshold; when the hydraulic suppression efficiency index is lower than the efficiency threshold, it is determined that the fire water system has insufficient suppression capacity, and a fan compensation control command is generated to control the jet fan to switch to heat exhaust compensation mode.

[0015] Among them, the fan operating frequency in the heat exhaust compensation mode is higher than that in the standard smoke exhaust strategy.

[0016] Optionally, the data acquisition and monitoring module includes:

[0017] The intelligent network-connected temperature and vibration monitoring unit is attached to the surface of the fire pump and is used to collect the mechanical vibration parameters.

[0018] An intelligent connected electrical performance monitoring unit is installed on the power supply cable of the fire pump and is used to collect the electrical performance parameters.

[0019] Wireless digital pressure gauges are installed in fire protection pipe networks to collect real-time water pressure data of the network.

[0020] The integrated control module is used to calculate the hydraulic pressure efficiency index based on the mechanical vibration parameters, the electrical performance parameters, and the real-time water pressure data.

[0021] Optionally, the data acquisition and monitoring module adopts a layered communication architecture, including a terminal layer, an intermediate network transmission layer, and a platform layer;

[0022] The terminal layer includes an intelligent connected temperature and vibration monitoring unit, an intelligent connected electrical performance monitoring unit, and a tunnel environment detection device. The devices in the terminal layer are connected via RS485 bus or LORA wireless communication.

[0023] The intermediate network transmission layer includes an IoT gateway, which aggregates the data collected by the terminal layer and transmits it to the integrated control module of the platform layer via a 4G / 5G wireless network or Ethernet.

[0024] Optionally, the execution module further includes a traffic guidance device and an emergency lighting device;

[0025] The integrated control module is configured to execute the following linkage control logic synchronously with the control of the jet fan and the fire pump when entering the fire control mode:

[0026] Turn on all emergency lighting devices and conventional lighting fixtures in the tunnel;

[0027] The traffic guidance device is controlled to illuminate the vehicle crosswalk signs and pedestrian crosswalk signs.

[0028] The traffic lights in the traffic guidance device are switched to a no-entry state, and the variable speed limit sign is switched to an emergency speed limit state.

[0029] A control method for a tunnel ventilation fan control and disaster prevention equipment linkage system includes the following steps:

[0030] Multi-dimensional data synchronization: After confirming the fire signal, real-time fluid pressure of the fire protection pipeline network inside the tunnel is collected. Real-time operating current of the fire pump power supply circuit Real-time vibration intensity of the pump body surface ;

[0031] Standard coordinated start-up: Controls the fire pump to start and controls the jet fan to operate according to the preset standard smoke exhaust strategy;

[0032] Performance trend calculation: based on the collected real-time fluid pressure The real-time operating current and the real-time vibration intensity Calculate the hydraulic pressure efficiency index ;

[0033] Prediction and compensation decision-making: The calculated hydraulic suppression efficiency index With the preset dynamic failure threshold Compare; when When it is determined that the fire water system is at risk of imminent failure or insufficient suppression capacity, a fan compensation control command is generated.

[0034] Heat exhaust compensation execution: According to the fan compensation control command, control the jet fan to switch from the standard smoke exhaust strategy to the heat exhaust compensation mode.

[0035] Optionally, the method for obtaining the fire signal includes:

[0036] Real-time monitoring is performed using tunnel environment monitoring equipment installed inside the tunnel. When the monitored environmental parameters exceed a preset threshold, an automatic detection signal is generated; or, a manual trigger signal is received from a manual alarm button installed on the tunnel sidewall.

[0037] After receiving the automatic detection signal or the manual trigger signal, the integrated control module performs logical confirmation or waits for operator instruction confirmation to determine that a fire condition has been established.

[0038] Optionally, the hydraulic suppression efficiency index is calculated. The methods include:

[0039] Obtain the preset rated pressure constant Rated current constant and vibration limit constant ;

[0040] Calculate the rate of change of pressure ;

[0041] Calculate the hydraulic pressing efficiency index : ;

[0042] in: and As the basic weighting coefficient, and ; This is the pressure attenuation penalty coefficient; This is the vibration nonlinearity penalty factor.

[0043] Optionally, the operating logic of the heat dissipation compensation mode includes:

[0044] The standard smoke extraction strategy is defined as the fan operating at a stratified maintenance frequency. The layering maintenance frequency The critical value corresponding to the wind speed at the tunnel cross section that does not disrupt the smoke stratification;

[0045] The heat dissipation compensation mode is defined as the fan operating at the structural protection frequency. ;

[0046] When the judgment At that time, the jet fan controlling the upstream of the fire point... Accelerate to ,in This is the highest rated frequency for the fan.

[0047] Optionally, the heat dissipation compensation execution step further includes:

[0048] Real-time monitoring of the load current of each jet fan in the tunnel. ;

[0049] Calculate the thermal attenuation of the load current of each group of fans relative to the reference value. : ,in This is the reference current when the fan draws in ambient temperature air;

[0050] Identified Largest wind turbine The fan unit was determined to be located in the core area of ​​high-temperature flue gas.

[0051] When executing the heat dissipation compensation mode, the fan unit is locked first. The adjacent fan units downstream of the exhaust direction execute fan compensation control commands.

[0052] Optionally, the method for generating the automatic detection signal includes:

[0053] Real-time collection of environmental parameters within the tunnel using tunnel environmental monitoring equipment;

[0054] The collected environmental parameters are compared with the early warning threshold and the alarm threshold, respectively; wherein the environmental danger level represented by the alarm threshold is higher than that of the early warning threshold.

[0055] If the environmental parameter does not reach the warning threshold, the environment is determined to be normal or the existing warning status is revoked; if the environmental parameter reaches the warning threshold but does not reach the alarm threshold, the warning status is triggered and the monitoring data of the current period is recorded.

[0056] An environmental anomaly is determined and the automatic detection signal is generated only when the environmental parameters reach the alarm threshold.

[0057] Compared with the prior art, the present invention has the following features and beneficial effects:

[0058] This invention calculates the hydraulic suppression efficiency index, which includes a pressure trend term and a vibration penalty term, in real time. When the hydraulic suppression efficiency index drops below the threshold, the jet fan is forced to operate at the rated maximum frequency, which can quickly remove the high-temperature flue gas accumulated in the tunnel arch, thereby effectively preventing the tunnel concrete structure from cracking, peeling, or even collapsing due to prolonged exposure to ultra-high temperatures.

[0059] This invention reduces the risk of false alarms and improves the overall redundancy and security of the system by incorporating environmental parameters collected by environmental monitoring equipment into the generation logic of automatic detection signals and setting a graded threshold judgment mechanism. Attached Figure Description

[0060] The accompanying drawings illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the principles of the invention. These drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, but do not constitute a limitation on the embodiments of the present invention.

[0061] Figure 1 This is a structural block diagram of a tunnel ventilation control and disaster prevention equipment linkage system according to the present invention.

[0062] Figure 2 This is a schematic diagram of the layered communication architecture of the data acquisition and monitoring module according to the present invention.

[0063] Figure 3 This is a configuration diagram of a specific implementation example according to the present invention.

[0064] Figure 4 This is a flowchart illustrating a control method for a tunnel ventilation control and disaster prevention equipment linkage system according to the present invention.

[0065] Figure 5 This is a schematic flowchart of the fire signal acquisition method according to the present invention. Detailed Implementation

[0066] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0067] It should also be noted that, for ease of description, only the parts relevant to the present invention are shown in the accompanying drawings.

[0068] Where there is no conflict, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0069] Example 1

[0070] like Figure 1 As shown, a tunnel ventilation control and disaster prevention equipment linkage system is provided. By integrating the operation status feedback of the fire water system, adaptive dynamic compensation for tunnel ventilation and smoke exhaust strategies is achieved.

[0071] The system mainly consists of three parts: a data acquisition and monitoring module, an execution module, and a comprehensive control module.

[0072] The data acquisition and monitoring module is used to collect environmental parameters inside the tunnel in real time, as well as the operating status parameters of the fire water system; the operating status parameters include at least the mechanical vibration parameters and electrical performance parameters of the water pump.

[0073] The execution module includes a jet fan for tunnel ventilation and smoke extraction and a fire pump for fire suppression;

[0074] The integrated control module is communicatively connected to both the data acquisition and monitoring module and the execution module; the integrated control module is configured as follows:

[0075] Upon receiving a fire signal, the system enters fire control mode and executes the following control logic: controls the fire pump to start and controls the jet fan to operate according to the preset standard smoke exhaust strategy; calculates the hydraulic suppression efficiency index in real time based on the operating status parameters.

[0076] The hydraulic suppression efficiency index is compared with the preset efficiency threshold. When the hydraulic suppression efficiency index is lower than the efficiency threshold, it is determined that the fire water system has insufficient suppression capacity. A fan compensation control command is generated to control the jet fan to switch to the heat exhaust compensation mode.

[0077] Among them, the fan operating frequency in the heat exhaust compensation mode is higher than that in the standard smoke exhaust strategy.

[0078] As a specific hardware implementation, the data acquisition and monitoring module preferably uses intelligent network-connected sensing devices, including:

[0079] The intelligent network-connected temperature and vibration monitoring unit is attached to the surface of the fire pump (e.g., the pump casing) to collect mechanical vibration parameters and reflect the mechanical stability of the pump body.

[0080] The intelligent connected electrical performance monitoring unit is installed on the power supply cable of the fire pump to collect electrical performance parameters, such as current and voltage, to reflect the load performance of the pump.

[0081] Wireless digital pressure gauges are installed in fire protection pipe networks to collect real-time water pressure data of the network.

[0082] The integrated control module is used to calculate the hydraulic pressure efficiency index based on mechanical vibration parameters, electrical performance parameters, and real-time water pressure data.

[0083] The working principle and control process are as follows:

[0084] Upon receiving a fire signal (either from an external detection device or manually triggered), the integrated control module immediately enters fire control mode and performs the following operations in parallel:

[0085] Coordination Activation: This involves controlling the start of the fire pumps to provide water for firefighting, while simultaneously controlling the jet fans to operate according to a pre-set "standard smoke extraction strategy." During this phase, the fans typically operate at frequencies conducive to maintaining smoke stratification.

[0086] Performance calculation: During equipment operation, the integrated control module calculates the hydraulic suppression performance index in real time through an algorithm based on the acquired mechanical vibration parameters, electrical performance parameters and real-time water pressure data, to obtain the actual suppression capability of the current water system against the fire source.

[0087] Judgment and compensation: The calculated hydraulic pressure efficiency index is compared with the preset efficiency threshold.

[0088] If the hydraulic pressure suppression efficiency index is lower than the efficiency threshold, the system will determine that the current pressure suppression capacity of the fire water system is insufficient (for example, pump failure or pipeline pressure loss may have occurred).

[0089] At this point, the integrated control module automatically generates a fan compensation control command, forcibly controlling the jet fan to switch from the current "standard smoke exhaust strategy" to "heat exhaust compensation mode".

[0090] Example 2

[0091] like Figure 2 As shown, the data acquisition and monitoring module adopts a layered communication architecture, including a terminal layer, an intermediate network transmission layer, and a platform layer.

[0092] The terminal layer includes intelligent connected temperature and vibration monitoring units, intelligent connected electrical performance monitoring units, and tunnel environment detection equipment (such as CO / VI detectors). The devices in the terminal layer are connected via RS485 bus (an industrial wired communication standard with strong anti-interference capabilities) or LORA wireless communication (a long-distance, low-power wireless communication technology).

[0093] The intermediate network transmission layer includes IoT gateways, which aggregate data collected by the terminal layer and act as a bridge for data uploading; and transmit the data to the integrated control module of the platform layer through 4G / 5G wireless networks or Ethernet.

[0094] In addition to fans and water pumps, the execution module also integrates traffic guidance devices and emergency lighting devices to strengthen the control of personnel evacuation and traffic flow within the tunnel.

[0095] The integrated control module is configured to execute the following linkage control logic synchronously with the control jet fan and fire pump when entering fire control mode:

[0096] Turn on all emergency lighting devices and conventional lighting fixtures in the tunnel; provide maximum possible illumination in smoky environments to assist personnel in escaping.

[0097] The vehicle crosswalk and pedestrian crosswalk signs in the traffic control and guidance devices are illuminated; the location of lateral escape routes within the tunnel is clearly indicated.

[0098] Traffic lights in the traffic guidance system are switched to a no-entry state (usually red) to prevent external vehicles from continuing to flood into the tunnel; and variable speed limit signs are switched to an emergency speed limit state (e.g., displaying a lower speed limit value) to guide vehicles already in the tunnel to pass through safely at a low speed or stop.

[0099] Example 3

[0100] For reference Figure 3 Taking a tunnel section of the Leshan-Xichang Expressway as an example, this paper provides a detailed explanation of the specific engineering deployment of the data acquisition and monitoring module, the integrated control module, and the execution module.

[0101] The deployment of the data acquisition and monitoring module is configured according to the tunnel mileage and disaster prevention requirements.

[0102] Traffic flow detection: Vehicle detectors are installed at both ends of the tunnel to monitor traffic flow entering and exiting the tunnel.

[0103] Environmental monitoring: In tunnels equipped with ventilation facilities, starting from 150m from the tunnel entrance, one set of environmental monitoring components is deployed every 1km, including CO / VI detectors (carbon monoxide / visibility), NO2 detectors, and wind direction and speed detectors, with no less than 3 sets configured in each ventilation section.

[0104] Manual alarm: Manual alarm buttons are installed in the tunnel at 50m intervals and at the same location as the fire equipment box; manual alarm buttons are also installed in buildings such as substations and axial flow fan rooms.

[0105] Automatic fire detection: Two sets of automatic fire detection devices are installed on the top of the tunnel, using distributed fiber optic detectors or a combination of fiber optic gratings and point flame detectors.

[0106] Fire water system status monitoring: Adsorb the intelligent networked temperature and vibration monitoring unit on the surface of the fire pump; connect the power supply cable of the water pump to the intelligent networked electrical performance monitoring unit.

[0107] The integrated control module is located in the linkage control cabinet of the tunnel monitoring room and is equipped with an access verification unit (featuring a password input interface and operation count statistics). This module has preset logical thresholds for control in non-fire operating conditions.

[0108] CO concentration threshold: The preset warning value is 70 ppm, and the alarm value is 100 ppm.

[0109] Visibility (VI) threshold: The preset warning value is 200m, and the alarm value is 100m. When environmental parameters reach the above alarm values, the integrated control module will automatically trigger the fan to perform CO / VI over-limit control.

[0110] The execution module and related linkage interfaces connect to various disaster prevention equipment in the tunnel, including traffic lights, variable speed limit signs, emergency lighting, fire hydrant pumps, as well as the CCTV system and emergency notification device in the monitoring center.

[0111] The integrated control module is pre-set to automatically notify relevant parties in the event of a fire, including the local fire department's telephone number, the local traffic police contact person, the superior authority, and other relevant units, in order to achieve cross-departmental collaboration.

[0112] Example 4

[0113] like Figure 4 As shown, a control method for a tunnel ventilation fan control and disaster prevention equipment linkage system is provided, including the following steps:

[0114] Multidimensional data synchronization: After confirming the fire signal, key physical quantities are collected in real time.

[0115] Real-time fluid pressure of fire protection pipe network inside tunnel This reflects whether the water transport capacity in the fire protection pipeline network is sufficient.

[0116] Real-time operating current of the fire pump power supply circuit This reflects whether the electrical working status of the fire pump as a power source is normal.

[0117] Real-time vibration intensity of pump body surface This reflects the mechanical health of the pump body under high-speed operation.

[0118] Standard coordinated start-up: Controls the fire pump to start and controls the jet fan to operate according to a preset standard smoke extraction strategy. The standard smoke extraction strategy usually refers to the fan operating at a specific frequency that maintains smoke stratification (prevents smoke from sinking), creating the best escape environment for people inside the tunnel.

[0119] Performance trend calculation: based on real-time fluid pressure data. Real-time operating current and real-time vibration intensity Calculate the hydraulic pressure efficiency index This quantifies the actual suppression capability of the current fire water system against the heat release from the fire source.

[0120] Prediction and Compensation Decisions: Calculating the hydraulic suppression efficiency index With the preset dynamic failure threshold Compare;

[0121] when The system is functioning normally; the status quo will be maintained.

[0122] when When it is determined that the fire water system is at risk of failure or insufficient suppression capacity (the water pressure is present but the vibration is violent, indicating that the system is about to shut down; or the current is too low, indicating that the system is running idle), the "standard smoke exhaust" alone is no longer sufficient to cope with the potentially out-of-control fire temperature, and a fan compensation control command is generated.

[0123] Heat exhaust compensation execution: According to the fan compensation control command, the jet fan is controlled to switch from the standard smoke exhaust strategy to the heat exhaust compensation mode. In this mode, the fan no longer prioritizes smoke stratification, but maximizes the exhaust volume by increasing the operating frequency (usually full speed operation), which aims to quickly remove the high temperature accumulated in the tunnel arch and protect the tunnel structure safety.

[0124] Example 5

[0125] like Figure 5 As shown in the figure, this embodiment illustrates the system startup triggering mechanism, namely the acquisition and confirmation of fire signals and the hierarchical judgment logic based on environmental parameters, to ensure that the system can respond sensitively to real fires and effectively avoid unnecessary shutdowns caused by false alarms.

[0126] To improve the reliability of sensing, this embodiment adopts a dual-source complementary mode of "automatic + manual" to acquire fire signals. The acquisition method includes:

[0127] Real-time monitoring is conducted using tunnel environment monitoring equipment installed inside the tunnel. When the monitored environmental parameters (such as smoke concentration, temperature, gas concentration, etc.) exceed the preset threshold, an automatic detection signal is generated; or, a manual trigger signal is received from a manual alarm button installed on the tunnel sidewall.

[0128] After receiving an automatic detection signal or a manual trigger signal, the integrated control module enters the confirmation and positioning stage: it performs logical confirmation or waits for operator instruction confirmation to determine that the fire condition has been established, and at the same time, it can lock the longitudinal coordinates of the fire location.

[0129] Regarding the generation of automatic detection signals, this embodiment further discloses an optional hierarchical threshold determination method, which reduces the false alarm rate through multi-level filtering. The method for generating automatic detection signals includes:

[0130] Real-time collection of environmental parameters within the tunnel using tunnel environmental monitoring equipment;

[0131] The collected environmental parameters are compared with the early warning threshold and the alarm threshold, respectively; among them, the alarm threshold represents a higher level of environmental danger than the early warning threshold.

[0132] If the environmental parameters do not reach the warning threshold, the environment is determined to be normal or the existing warning status is revoked; if the environmental parameters reach the warning threshold but do not reach the alarm threshold, the warning status is triggered and the monitoring data of the current period is recorded.

[0133] An environmental anomaly is determined and an automatic detection signal is generated only when environmental parameters reach the alarm threshold.

[0134] That is, to execute three different logical branches:

[0135] Normal / Reset Status: If the collected environmental parameters do not reach the warning threshold, the system determines that the current environment is normal, or cancels any previous warning status, keeping the system in normal monitoring mode.

[0136] Warning / Recording Status: If environmental parameters reach the warning threshold but not the alarm threshold, the system enters the warning status. At this time, although the system does not generate an automatic detection signal to trigger a fire mode, it will trigger a warning and record the monitoring data for the current period for subsequent traceability or trend analysis.

[0137] Alarm / Trigger Status: The system will only determine that an environmental anomaly has been established when environmental parameters continue to deteriorate and reach the alarm threshold, and will then generate an automatic detection signal to trigger the subsequent fire control process.

[0138] Example 6

[0139] This embodiment provides a method for calculating the hydraulic pressure efficiency index. The methods include:

[0140] Obtain the preset baseline data.

[0141] Rated pressure constant This represents the standard water pressure value of the fire protection pipeline network under design conditions.

[0142] Rated current constant This represents the standard current value of the water pump when it is operating normally under full load.

[0143] Vibration limit constant This represents the maximum safe boundary value for mechanical vibration that the water pump can tolerate (usually set according to relevant mechanical standards).

[0144] Calculate the rate of change of pressure It reflects the instantaneous change trend of pipeline pressure (such as rapid drop or stable maintenance).

[0145] Calculate the hydraulic pressure efficiency index : ;

[0146] in: and As the basic weighting coefficient, and ; This is the pressure attenuation penalty coefficient.

[0147] This is a vibration nonlinearity penalty factor. When the vibration is small, its impact on performance is negligible; however, as the vibration approaches its limit, this factor decreases rapidly on a quadratic basis, thereby significantly reducing the overall performance index.

[0148] Used to detect worsening trends in stress, if stress is rapidly decreasing ( (If it is a large negative number), the absolute value of this term increases, multiplied by the pressure attenuation penalty coefficient. Then, it is deducted from the total score, enabling the system to reduce the efficiency index in advance when the pressure has not yet fallen below the low threshold but is rapidly collapsing, thus achieving prediction.

[0149] Example 7

[0150] This embodiment provides a dual-mode jet fan, including a standard smoke exhaust mode and a heat exhaust compensation mode.

[0151] The standard smoke extraction strategy is defined as the fan operating at a stratified maintenance frequency. Layering to maintain frequency The critical value corresponding to the wind speed at the tunnel cross section without disrupting the stratification of the smoke is used to prevent the backflow of smoke while avoiding turbulence caused by excessive wind speed, thus maintaining the stratification of the smoke (i.e., keeping the high-temperature smoke flowing at the top of the tunnel and leaving a clear escape space at the bottom).

[0152] The heat dissipation compensation mode is defined as the fan operating at the structural protection frequency. ;

[0153] When the judgment At that time, the jet fan controlling the upstream of the fire point... Accelerate to ,in At the highest rated frequency of the fan, the system no longer prioritizes smoke stratification, but immediately controls the jet fan upstream of the fire point to increase its frequency, using the maximum longitudinal air volume to quickly replace the heat accumulated in the arch, preventing the concrete structure at the top of the tunnel from collapsing due to prolonged high temperature.

[0154] In addition, to ensure that the high-power heat dissipation action can be precisely applied to the area most severely affected by the fire, the heat dissipation compensation execution steps also include:

[0155] Real-time monitoring of the load current of each jet fan in the tunnel. ;

[0156] Calculate the thermal attenuation of the load current of each group of fans relative to the reference value. : ,in This is the reference current when the fan draws in ambient temperature air. When the fan draws in high-temperature flue gas, the air density decreases, reducing the running resistance of the fan blades and causing a drop in motor load, thus lowering the operating current. Therefore, the greater the temperature difference, the greater the current drop (i.e., the thermal attenuation).

[0157] Identified Largest wind turbine The fan unit was determined to be located in the core area of ​​high-temperature flue gas (i.e., the center of the fire source or the point of highest temperature).

[0158] When implementing the heat exhaust compensation mode, the fan unit is locked first. The adjacent fan units downstream of the exhaust direction execute fan compensation control commands.

[0159] In the description of this specification, the references to terms such as "one embodiment / mode," "some embodiments / modes," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment / mode or example is included in at least one embodiment / mode or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment / mode or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments / modes or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments / modes or examples described in this specification, as well as the features of different embodiments / modes or examples.

[0160] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0161] Those skilled in the art should understand that the above embodiments are merely for illustrating the present invention and are not intended to limit the scope of the invention. Those skilled in the art can make other changes or modifications based on the above invention, and these changes or modifications still fall within the scope of the present invention.

Claims

1. A tunnel fan control and disaster prevention equipment linkage system, characterized by, Comprise: Data acquisition monitoring module, for real-time acquisition of environmental parameters in the tunnel, acquisition of running state parameters of the fire water system; The running state parameters at least include mechanical vibration parameters and electrical performance parameters of the water pump; The execution module includes a jet fan for tunnel ventilation and smoke exhaust and a fire water pump for fire suppression; The comprehensive control module is respectively connected with the data acquisition monitoring module and the execution module; The comprehensive control module is set to: Enter fire control mode after receiving fire signal, and execute the following control logic: control the fire water pump to start, and control the jet fan to operate according to the preset standard smoke exhaust strategy; According to the running state parameters, the hydraulic suppression efficiency index is calculated in real time; Compare the hydraulic suppression efficiency index with the preset efficiency threshold value; When the hydraulic suppression efficiency index is lower than the efficiency threshold value, it is judged that the fire water system suppression capacity is insufficient, the fan compensation control instruction is generated, and the jet fan is controlled to switch to heat exhaust compensation mode; Wherein, the fan operating frequency in heat exhaust compensation mode is higher than that in standard smoke exhaust strategy.

2. The tunnel's fan control and disaster equipment linkage system according to claim 1, wherein The data acquisition monitoring module comprises: Intelligent networked temperature and vibration monitor unit, which is adsorbed on the surface of the fire water pump, for collecting the mechanical vibration parameters; Intelligent networked electrical performance monitoring unit, which is sleeved on the power cable of the fire water pump, for collecting the electrical performance parameters; Wireless digital pressure gauge, arranged in the fire pipe network, for collecting real-time water pressure data of the pipe network; The comprehensive control module is used to calculate the hydraulic suppression efficiency index according to the mechanical vibration parameters, the electrical performance parameters and the real-time water pressure data.

3. The tunnel's fan control and disaster equipment linkage system of claim 1, wherein, The data acquisition monitoring module adopts hierarchical communication architecture, including terminal layer, intermediate network transmission layer and platform layer; The terminal layer includes intelligent networked temperature and vibration monitor unit, intelligent networked electrical performance monitoring unit and tunnel environment detection equipment, and each device of the terminal layer is connected through RS485 bus or LORA wireless communication mode; The intermediate network transmission layer includes Internet of Things gateway, which collects the data collected by the terminal layer, and transmits to the comprehensive control module of the platform layer through 4G / 5G wireless network or Ethernet.

4. The tunnel fan control and fire suppression equipment linkage system of claim 1, wherein, The execution module further comprises traffic guiding device and emergency lighting device; The comprehensive control module is set to: when entering fire control mode, the following linkage control logic is executed synchronously with the control of the jet fan and the fire water pump: Control the emergency lighting device and the conventional lighting lamps and lanterns in the tunnel to be turned on; Control the car cross aisle sign and the pedestrian cross aisle sign in the traffic guiding device to be lit; Control the traffic signal lamp in the traffic guiding device to switch to the forbidden state, and switch the variable speed limit sign to the emergency speed limit state.

5. A control method of a tunnel fan control and disaster prevention equipment linkage system, characterized by, The method comprises the following steps: Multi-dimensional data synchronization: after confirming the fire signal, real-time acquisition of the real-time fluid pressure of the fire-fighting pipe network in the tunnel , real-time working current of the fire pump power supply circuit , real-time vibration intensity of the pump body surface ; Standard cooperative start: control the fire water pump to start, and control the jet fan to operate according to the preset standard smoke exhaust strategy; performance trend calculation: based on the acquired real-time fluid pressure , the real-time operating current , and the real-time vibration intensity , calculate the hydraulic suppression performance index ; Prediction and compensation decision-making: The calculated hydraulic suppression efficiency index With the preset dynamic failure threshold Compare; when When it is determined that the fire water system is at risk of imminent failure or insufficient suppression capacity, a fan compensation control command is generated. Heat exhaust compensation execution: according to the fan compensation control instruction, control the jet fan to switch from standard smoke exhaust strategy to heat exhaust compensation mode.

6. The control method of claim 5, wherein The method for obtaining the fire signal comprises: The tunnel environment detection device laid in the tunnel monitors in real time, and generates the automatic detection signal when the monitored environment parameter exceeds a preset threshold value; or, receives the artificial trigger signal sent by the manual alarm button installed on the tunnel side wall; After receiving the automatic detection signal or the artificial trigger signal, the comprehensive control module performs logical confirmation or waits for operator instruction confirmation to determine that the fire condition is established.

7. The control method of claim 5, wherein the control method further comprises: determining whether the tunnel is in use; and if the tunnel is in use, controlling the fan to operate at a predetermined speed. A method of calculating the hydraulic compaction efficiency index includes: acquiring a preset rated pressure constant , a rated current constant , and a vibration limit constant ; Computing the rate of change of pressure ; calculating the hydraulic crushing efficiency index : ; wherein: and are base weight coefficients, and ; is a pressure decay penalty coefficient; is a vibration nonlinearity penalty factor.

8. The control method of claim 5, wherein the control method further comprises: The operation logic of the heat removal compensation mode includes: said standard smoke evacuation strategy is defined as the fan operating at a stratification maintenance frequency , said stratification maintenance frequency corresponding to the critical value of the cross-sectional tunnel air speed not to disrupt the stratification of the smoke defining the heat rejection compensation mode as the fan operating at a structural protection frequency ; When it is determined that the jet fan upstream of the fire point is controlled to accelerate from to wherein is the fan's rated maximum frequency.

9. The control method of claim 5, wherein the control method further comprises: determining whether the tunnel is in use; and if the tunnel is in use, controlling the fan to operate at a predetermined speed. The heat removal compensation execution step further includes: Real-time monitoring of load current of each group of jet fans in a tunnel ; calculating the thermal decay of the load current of each group of fans relative to a reference value : wherein is the reference current when the fan draws in air at ambient temperature; identify the largest fan group , it is determined that the fan group is in the high-temperature flue gas core area; When executing the heat dissipation compensation mode, the fan unit is locked first. The adjacent fan units downstream of the exhaust direction execute fan compensation control commands.

10. The control method of claim 6, wherein The method for generating the automatic detection signal includes: The tunnel environment detection device collects environment parameters in the tunnel in real time; The collected environment parameters are compared with a warning threshold value and an alarm threshold value respectively; the environment danger degree represented by the alarm threshold value is higher than that of the warning threshold value; If the environment parameter does not reach the warning threshold value, it is determined that the environment is normal or the existing warning state is cancelled; if the environment parameter reaches the warning threshold value but does not reach the alarm threshold value, a warning state is triggered and the monitoring data of the current period is recorded; Only when the environment parameter reaches the alarm threshold value, it is determined that the environment is abnormal, and the automatic detection signal is generated.

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