Emergency early warning method for protection state and combat radius of positive pressure oxygen respirator

Abstract

The invention relates to a positive pressure oxygen respirator protection state and combat radius emergency early warning method, and belongs to the technical field of emergency rescue, and the method comprises the following steps: collecting the residual oxygen pressure of a respirator; collecting the movement distance of the personnel; acquiring the fastest movement speed and average movement speed of the personnel; the collected data is utilized to realize respirator residual protection time risk early warning, personnel return safety place risk early warning, personnel combat radius early warning and respirator airtightness early warning; and giving an emergency command decision based on each early warning result.

Description

Technical Field

[0001] This invention belongs to the field of emergency rescue technology and relates to an emergency early warning method for the protective status and operational radius of a positive pressure oxygen respirator. Background Technology

[0002] Positive pressure oxygen respirators are core protective equipment for rescue and work personnel in high-risk industries such as coal mines, tunnels, fire fighting, and chemical plants. They can provide an independent oxygen supply to personnel in extreme environments such as oxygen deficiency, toxic and harmful gases, or high-temperature fires, ensuring the safety of workers. However, with the frequent occurrence of underground disasters, fire and explosion accidents, and sudden chemical leaks, rescue missions have placed higher demands on the safety and scientific use of respirators.

[0003] Currently, existing positive pressure oxygen respirators mostly rely on basic monitoring methods such as pressure gauges and timers. Workers manually estimate remaining oxygen levels and the time required to return to safety, lacking intelligent risk warning capabilities. This experience-based approach has many problems. Existing technologies often only estimate protection time based on remaining pressure, failing to consider individual user differences, actual movement speed, and distance, leading to large prediction errors and potential misjudgments. Workers in complex disaster environments may experience speed reductions or work stoppages; existing methods struggle to dynamically calculate the safe return radius using real-time movement data, posing a risk of delayed evacuation. Rescue command typically assigns operational areas based on experience or pre-defined distances, lacking scientific calculations based on real-time oxygen consumption and personnel physical condition, resulting in potential safety hazards in rescue mission planning. Currently, respirator airtightness issues mostly rely on manual checks before use, lacking real-time monitoring and tiered warnings during mission execution, easily leading to oxygen leaks due to decreased airtightness, endangering rescue safety. During rescue operations, existing technologies fail to integrate multiple monitoring data into quantifiable risk levels; commanders' decisions still rely on subjective experience, making it difficult to adjust rescue strategies promptly and scientifically.

[0004] Therefore, there is an urgent need for a comprehensive early warning method that integrates respirator status parameters and kinematic data to achieve real-time assessment and multi-level early warning of the protective status and combat radius of positive pressure oxygen respirators, so as to improve the safety and scientific nature of rescue operations. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide an emergency early warning method for the protective status and combat radius of a positive pressure oxygen respirator.

[0006] To achieve the above objectives, the present invention provides the following technical solution: An emergency early warning method for the protective status and combat radius of a positive pressure oxygen respirator includes the following steps: Determine the remaining oxygen pressure in the respirator of the person wearing the respirator. ; distance of movement of the data collectors The fastest speed of movement of the data collectors Average speed The remaining oxygen pressure in the respirator The unit is MPa, and the distance traveled by personnel is... The unit is meters (m), representing the fastest speed of human movement. and average speed The unit is m / s; The collected data is used to provide early warnings of risks related to the remaining protection time of respirators, the return of personnel to safe locations, the operational radius of personnel, and the airtightness of respirators. Based on the results of various early warnings, emergency command decisions are made.

[0007] Furthermore, calculate the average remaining oxygen pressure after the oxygen respirator has been operating for i minutes. : or

[0008] In the formula The oxygen pressure is collected by the sensor at the i-th minute, and n is the number of minutes of working time; when the pressure corresponding to the collection time point is blank, the pressure data of the previous collection time point is used. This represents the average remaining oxygen pressure of the oxygen respirator at minute i.

[0009] Furthermore, the total distance traveled by the person wearing the ventilator in the i-th minute was collected. and the corresponding exercise time .

[0010] Furthermore, the fastest speed of movement of the data collection personnel. Average speed Specifically, it includes: First, calculate the movement speed of the person wearing the respirator in the i-th minute:

[0011] In the formula Let be the speed of movement of the person in the i-th minute; The length of the movement path of the person from the moment they put on the respirator to the i-th minute; The length of the movement path of a person from the moment they put on the respirator to the (i-1)th minute; Calculate the fastest movement speed of a person wearing a ventilator. ,but Effective, otherwise Invalid, not used for calculation and :

[0012] .

[0013] Furthermore, the risk warning for the remaining protection time of the respirator specifically includes: Based on the average remaining oxygen pressure after the oxygen respirator has been operating for i minutes. It also measures the rate of descent, calculates the remaining protection time of the respirator, and issues an early warning. Assume the respirator collects pressure and time data as follows: ,but:

[0014]

[0015] in Let be the average residual oxygen pressure over n minutes. This represents the average duration of respirator protection. Let the relationship between residual oxygen pressure and occupational safety and health protection time be:

[0016]

[0017]

[0018] The time difference between P=5MPa and the current time is the maximum protection time before returning to a safe location; The safe return radius is:

[0019] The maximum safe return radius is:

[0020] The safe operational radius is:

[0021] The maximum safe combat radius is:

[0022] In the formula To ensure the safe return radius for personnel; To maximize the safe return radius for personnel; To ensure the safety of personnel during operations; To maximize the operational radius for personnel safety; For estimated non-travel operation time; The safety factor is determined based on the on-site environmental assessment; The distance between people and a safe location; This represents the decrease in oxygen pressure per unit time.

[0023] Furthermore, the risk warning for personnel returning to a safe location specifically includes: When safe return radius At that time, there was no risk in terms of combat distance; When safe return radius At that time, a Level 1 warning for operational distance risk was issued; When safe return radius At that time, a level-two warning for operational distance risk was issued; When safe return radius At that time, a level-three early warning for operational distance risk was issued; When safe return radius At that time, a level four warning for operational distance risk was issued.

[0024] Furthermore, the personnel combat radius early warning specifically includes: When the combat radius When the range is greater than 1000m, there is no risk to the combat radius; When the combat radius is 1000m≤ <700m, Level 1 early warning for combat radius; When the combat radius is 700m≤ <400m, Level II early warning for combat radius; When the combat radius is 400m≤ <100m, Level 3 early warning for combat radius; When the combat radius ≤100m, combat radius level four risk.

[0025] Furthermore, the respirator airtightness warning specifically includes: when There is no risk of airtightness when the pressure is <0.1MPa; When 0.1MPa≤ If the pressure is less than 0.15 MPa and the duration exceeds 2 minutes, a Level 1 airtightness warning will be issued. When 0.15MPa≤ When <0.3MPa, the duration exceeds 2 minutes, or 0.1MPa ≤ If the pressure is less than 0.15 MPa and the duration exceeds 5 minutes, a level II airtightness warning will be issued. When 0.3MPa≤ When <0.4MPa, the duration exceeds 2 minutes, or when 0.15MPa ≤ If the pressure is less than 0.3 MPa and the duration exceeds 5 minutes, a Level III airtightness warning will be issued. When 0.4MPa≤ When <0.5MPa, the duration exceeds 2 minutes, or when 0.15MPa ≤ When <0.3MPa, the duration exceeds 10 minutes, or 0.3MPa ≤ If the pressure is less than 0.4 MPa and the duration exceeds 5 minutes, a Level IV airtightness warning will be issued.

[0026] Furthermore, the emergency command and decision-making method specifically includes: 1) In addition to the combat radius warning, other warnings, when a Level 4 warning exists, the rescue team should immediately evacuate, and the rescue base should dispatch a standby team to meet the evacuating rescue team; 2) For warnings other than the operational radius warning, when a Level 3 warning exists, the rescue team should investigate the cause of the warning, collect on-site video information, and organize the evacuation of the rescue team; 3) For warnings other than the operational radius warning, when a Level II warning exists, the rescue team should investigate the cause of the warning and prepare for evacuation; 4) For warnings other than the operational radius warning, when a Level 1 warning exists, the rescue team should investigate the cause of the warning and respond to the disaster as quickly as possible; 5) Operational radius warning refers to the maximum distance that a rescue commander can order a rescue team to travel. Commanders must not order a rescue mission with an operational radius warning level exceeding three.

[0027] The beneficial effects of this invention are as follows: This invention combines real-time motion data with the pattern of oxygen pressure drop to more accurately calculate the remaining protection time of the respirator, avoiding the error of a "one-size-fits-all" estimation.

[0028] This invention utilizes data such as personnel movement speed and distance to calculate the safe return radius and maximum safe return radius in real time, enabling graded early warning of return risks and ensuring that rescue personnel can evacuate at the optimal time.

[0029] This invention establishes a quantitative relationship between the combat radius, remaining protection time, and operational load, and constructs a graded early warning mechanism to prevent rescue missions from exceeding the physiological limits of personnel, thereby improving the scientific nature and safety of mission command.

[0030] This invention establishes a multi-level airtightness early warning standard by monitoring the abnormal rate and duration of oxygen pressure drop, which can quickly detect respirator leaks during missions and avoid sudden hypoxia accidents.

[0031] This invention comprehensively analyzes the early warning results of multiple dimensions, including protection time, return radius, combat radius, and airtightness, to form corresponding emergency command strategies. This enables commanders to make rapid decisions based on data support and reduces the risk of relying on experience-based judgment.

[0032] This invention provides comprehensive, multi-parameter, and multi-level risk warnings, which can effectively reduce sudden risks in rescue missions and improve personnel survival rates and rescue efficiency.

[0033] In summary, by combining the real-time status of the respirator with operational environment data, this invention overcomes the limitations of existing technologies in protective status monitoring and operational radius assessment, providing an intelligent and data-driven solution for the safe use of positive pressure oxygen respirators and emergency rescue decision-making. It has significant practical value and promotional significance.

[0034] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0035] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein: Figure 1 Flowchart of emergency early warning method for the protective status and combat radius of positive pressure oxygen respirators; Figure 2 This is a graph showing the relationship between respirator oxygen pressure and protection time. Detailed Implementation

[0036] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0037] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0038] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0039] Example 1: like Figure 1 As shown, this invention provides an emergency early warning method for the protective status and combat radius of a positive pressure oxygen respirator, comprising the following steps: S1: Collect the remaining oxygen pressure in the respirator. ; Calculate the average remaining oxygen pressure after the oxygen respirator has been operating for i minutes. .

[0040] or

[0041] In the formula The oxygen pressure is measured in MPa at the i-th minute by the sensor. If the pressure at the time point is blank, the pressure data from the previous time point will be used. This represents the average remaining oxygen pressure after the oxygen respirator has been operating for the i-th minute.

[0042] S2: Distance traveled by the data collector ; Collect the total distance of movement of the person wearing a respirator in the i-th minute. and the corresponding exercise time .

[0043] S3: Maximum speed of movement of the data collector Average speed ; Calculate the fastest speed of personnel movement With average speed .

[0044] First, calculate the movement speed of the respirator wearer in the i-th minute.

[0045] In the formula Let be the speed of movement of the person in the i-th minute, in m / min; Let be the distance the person moves in the i-th minute, that is, the length of the person's movement route from the time the respirator is put on to the i-th minute, in meters; Let be the distance the person moves in the (i-1)th minute, that is, the length of the person's movement path from the time the respirator is put on to the (i-1)th minute, in meters; Calculate the fastest movement speed of a person wearing a ventilator. ,but Effective, otherwise Invalid, not used for calculation and .

[0046]

[0047]

[0048] S4: Risk warning for remaining protection time of respirator; Based on the average residual oxygen pressure per minute of the respirator It measures the rate of descent, calculates the remaining protection time of the respirator, and issues an early warning.

[0049] Assume the respirator collects pressure and time data as follows: ,but:

[0050]

[0051] in Let be the average residual oxygen pressure over n minutes. This represents the average duration of respirator protection. like Figure 2 As shown, since the oxygen pressure and protection time are basically linearly related during the use of the respirator, the relationship between the remaining oxygen pressure and the labor protection time is assumed to be:

[0052]

[0053]

[0054] The time difference between P=5MPa and the current time is the maximum protection time before returning to a safe location; Safe return radius:

[0055] Maximum safe return radius:

[0056] Safe operational radius:

[0057] Maximum safe combat radius:

[0058] In the formula The radius for safe return of personnel, in meters (m); The maximum safe return radius for personnel is given in meters (m). The safe operational radius for personnel is measured in meters (m). The maximum safe operational radius for personnel is measured in meters (m). For estimated non-travel operation time; The safety factor is determined based on the on-site environmental assessment; The distance of a person from a safe location, in meters (m). It represents the decrease in oxygen pressure per unit time, expressed in MPa / min, and is generally between 0.06 and 0.1. S5: Risk warning for personnel returning to a safe location: When safe return radius At that time, there was no risk in terms of combat distance; When safe return radius At that time, a Level 1 warning for operational distance risk was issued; When safe return radius At that time, a level-two warning for operational distance risk was issued; When safe return radius At that time, a level-three early warning for operational distance risk was issued; When safe return radius At that time, a Level 4 warning for operational distance risk was issued; S6: Personnel Combat Radius Warning When the combat radius When the range is greater than 1000m, there is no risk to the combat radius; When the combat radius is 1000m≤ <700m, Level 1 early warning for combat radius; When the combat radius is 700m≤ <400m, Level II early warning for combat radius; When the combat radius is 400m≤ <100m, Level 3 early warning for combat radius; When the combat radius ≤100m, combat radius level four risk.

[0059] S7: Respirator airtightness warning: when There is no risk of airtightness when the pressure is <0.1MPa; When 0.1MPa≤ If the pressure is less than 0.15 MPa and the duration exceeds 2 minutes, a Level 1 airtightness warning will be issued. When 0.15MPa≤ When <0.3MPa, the duration exceeds 2 minutes, or 0.1MPa ≤ If the pressure is less than 0.15 MPa and the duration exceeds 5 minutes, a level II airtightness warning will be issued. When 0.3MPa≤ When <0.4MPa, the duration exceeds 2 minutes, or when 0.15MPa ≤ If the pressure is less than 0.3 MPa and the duration exceeds 5 minutes, a Level III airtightness warning will be issued. When 0.4MPa≤ When <0.5MPa, the duration exceeds 2 minutes, or when 0.15MPa ≤ When <0.3MPa, the duration exceeds 10 minutes, or 0.3MPa ≤ If the pressure is less than 0.4 MPa and the duration exceeds 5 minutes, a Level IV airtightness warning will be issued.

[0060] S8: Emergency Command and Decision-Making Methods 1) In addition to the combat radius warning, other warnings, when a Level 4 warning exists, the rescue team should immediately evacuate, and the rescue base should dispatch a standby team to meet the evacuating rescue team; 2) For warnings other than the operational radius warning, when a Level 3 warning exists, the rescue team should investigate the cause of the warning, collect on-site video information, and organize the evacuation of the rescue team; 3) For warnings other than the operational radius warning, when a Level II warning exists, the rescue team should investigate the cause of the warning and prepare for evacuation; 4) For warnings other than the operational radius warning, when a Level 1 warning exists, the rescue team should investigate the cause of the warning and respond to the disaster as quickly as possible; 5) Operational radius warning refers to the maximum distance that a rescue commander can order a rescue team to travel. Commanders must not order a rescue mission with an operational radius warning level exceeding three.

[0061] Example 2: An electronic device, including a memory and a processor; The memory is used to store computer programs; The processor is configured to implement the method described in Embodiment 1 when executing the computer program.

[0062] Example 3: A computer-readable storage medium storing a computer program that, when executed by a processor, implements the method described in Embodiment 1.

[0063] Example 4: A computer program product includes a computer program that, when executed by a processor, implements the method described in Example 1.

[0064] In the above embodiments, the reference to "this embodiment" in the specification indicates that a specific feature, structure, or characteristic described in connection with the embodiment is included in at least some embodiments, but not necessarily all embodiments. Multiple appearances of "this embodiment" do not necessarily all refer to the same embodiment.

[0065] In the above embodiments, although the invention has been described in conjunction with specific embodiments thereof, many substitutions, modifications, and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory structures (e.g., dynamic RAM (DRAM)) may be used with the embodiments discussed. The embodiments of the invention are intended to cover all such substitutions, modifications, and variations falling within the broad scope of the appended claims.

[0066] As will be understood by those skilled in the art, the computer-readable storage medium described in this embodiment allows for the implementation of all or part of the steps in the above method embodiments by computer program-related hardware. The aforementioned computer program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0067] The electronic terminal provided in this embodiment includes a processor, a memory, a transceiver, and a communication interface. The memory and the communication interface are connected to the processor and the transceiver and complete communication between them. The memory is used to store computer programs, the communication interface is used to perform communication, and the processor and the transceiver are used to run the computer programs, so that the electronic terminal performs the various steps of the above method.

[0068] In this embodiment, the memory may include random access memory (RAM) and may also include non-volatile memory, such as at least one disk storage device.

[0069] The processors mentioned above can be general-purpose processors, including central processing units (CPUs), network processors (NPs), etc.; they can also be digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0070] This invention can be used in a wide range of general-purpose or special-purpose computing system environments or configurations. Examples include: personal computers, server computers, handheld or portable devices, tablet devices, multiprocessor systems, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, and distributed computing environments including any of the above systems or devices, etc.

[0071] This invention can be described in the general context of computer-executable instructions, such as program modules, that are executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc., that perform a specific task or implement a specific abstract data type. This invention can also be practiced in distributed computing environments where tasks are performed by remote processing devices connected via a communication network. In distributed computing environments, program modules can reside in local and remote computer storage media, including storage devices.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An emergency early warning method for the protective status and combat radius of a positive pressure oxygen respirator, characterized in that: Includes the following steps: Determine the remaining oxygen pressure in the respirator of the person wearing the respirator. ; distance of movement of the data collectors The fastest speed of movement of the data collectors Average speed The remaining oxygen pressure in the respirator The unit is MPa, and the distance traveled by personnel is... The unit is meters (m), representing the fastest speed of human movement. and average speed The unit is m / s; The collected data is used to provide early warnings of risks related to the remaining protection time of respirators, the return of personnel to safe locations, the operational radius of personnel, and the airtightness of respirators. Based on the results of various early warnings, emergency command decisions are made.

2. The emergency early warning method for the protective status and combat radius of a positive pressure oxygen respirator according to claim 1, characterized in that: Calculate the average remaining oxygen pressure after the oxygen respirator has been operating for i minutes. The respirator cannot monitor the pressure of used oxygen; this formula collects the remaining oxygen pressure. or In the formula The oxygen pressure is collected by the sensor at the i-th minute, and n is the number of minutes of working time; when the pressure corresponding to the collection time point is blank, the pressure data of the previous collection time point is used. This represents the average remaining oxygen pressure of the oxygen respirator at minute i.

3. The emergency early warning method for the protective status and combat radius of a positive pressure oxygen respirator according to claim 1, characterized in that: Collect the total distance of movement of the person wearing a respirator in the i-th minute. and the corresponding exercise time .

4. The emergency early warning method for the protective status and combat radius of a positive pressure oxygen respirator according to claim 1, characterized in that: The fastest speed of movement of the data collector Average speed Specifically, it includes: First, calculate the movement speed of the person wearing the respirator in the i-th minute: In the formula Let be the speed of movement of the person in the i-th minute; The length of the movement path of the person from the moment they put on the respirator to the i-th minute; The length of the movement path of a person from the moment they put on the respirator to the (i-1)th minute; Calculate the fastest movement speed of a person wearing a ventilator. ,but Effective, otherwise Invalid, not used for calculation and : 。 5. The emergency early warning method for the protective status and combat radius of a positive pressure oxygen respirator according to claim 1, characterized in that: The risk warning regarding the remaining protection time of the respirator specifically includes: Based on the average remaining oxygen pressure after the oxygen respirator has been operating for i minutes. It also measures the rate of descent, calculates the remaining protection time of the respirator, and issues an early warning. Assume the respirator collects pressure and time data as follows: ,but: in Let be the average residual oxygen pressure over n minutes. This represents the average duration of respirator protection. Let the relationship between residual oxygen pressure and occupational safety and health protection time be: The time difference between P=5MPa and the current time is the maximum protection time before returning to a safe location; The safe return radius is: The maximum safe return radius is: The safe operational radius is: The maximum safe combat radius is: In the formula To ensure the safe return radius for personnel; To maximize the safe return radius for personnel; To ensure the safety of personnel during operations; To maximize the operational radius for personnel safety; For the estimated non-travel operation time; The safety factor is determined based on the on-site environmental assessment; The distance between people and a safe location; This represents the decrease in oxygen pressure per unit time.

6. The emergency early warning method for the protective status and combat radius of a positive pressure oxygen respirator according to claim 1, characterized in that: The risk warning regarding personnel returning to a safe location specifically includes: When safe return radius At that time, there was no risk in terms of combat distance; When safe return radius At that time, a Level 1 warning for operational distance risk was issued; When safe return radius At that time, a level-two warning for operational distance risk was issued; When safe return radius At that time, a level-three early warning for operational distance risk was issued; When safe return radius At that time, a level four warning for operational distance risk was issued.

7. The emergency early warning method for the protective status and combat radius of a positive pressure oxygen respirator according to claim 6, characterized in that: The personnel combat radius early warning specifically includes: When the combat radius When the range is greater than 1000m, there is no risk to the combat radius; When the combat radius is 1000m≤ <700m, Level 1 early warning for combat radius; When the combat radius is 700m≤ <400m, Level II early warning for combat radius; When the combat radius is 400m≤ <100m, Level 3 early warning for combat radius; When the combat radius ≤100m, combat radius level four risk.

8. The emergency early warning method for the protective status and combat radius of a positive pressure oxygen respirator according to claim 7, characterized in that: The respirator airtightness warning specifically includes: when There is no risk of airtightness when the pressure is <0.1MPa; When 0.1MPa≤ If the pressure is less than 0.15 MPa and the duration exceeds 2 minutes, a Level 1 airtightness warning will be issued. When 0.15MPa≤ When <0.3MPa, the duration exceeds 2 minutes, or 0.1MPa ≤ If the pressure is less than 0.15 MPa and the duration exceeds 5 minutes, a level II airtightness warning will be issued. When 0.3MPa≤ When <0.4MPa, the duration exceeds 2 minutes, or when 0.15MPa ≤ If the pressure is less than 0.3 MPa and the duration exceeds 5 minutes, a Level III airtightness warning will be issued. When 0.4MPa≤ When <0.5MPa, the duration exceeds 2 minutes, or when 0.15MPa ≤ When <0.3MPa, the duration exceeds 10 minutes, or 0.3MPa ≤ If the pressure is less than 0.4 MPa and the duration exceeds 5 minutes, a Level IV airtightness warning will be issued.

9. The emergency early warning method for the protective status and combat radius of a positive pressure oxygen respirator according to claim 8, characterized in that: The emergency command and decision-making method specifically includes: 1) In addition to the combat radius warning, other warnings, when a Level 4 warning exists, the rescue team should immediately evacuate, and the rescue base should dispatch a standby team to meet the evacuating rescue team; 2) For warnings other than the operational radius warning, when a Level 3 warning exists, the rescue team should investigate the cause of the warning, collect on-site video information, and organize the evacuation of the rescue team; 3) For warnings other than the operational radius warning, when a Level II warning exists, the rescue team should investigate the cause of the warning and prepare for evacuation; 4) For warnings other than the operational radius warning, when a Level 1 warning exists, the rescue team should investigate the cause of the warning and respond to the disaster as quickly as possible; 5) Operational radius warning refers to the maximum distance that a rescue commander can order a rescue team to travel. Commanders must not order a rescue mission with an operational radius warning level exceeding three.

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