Gas mask with real-time operation state sensing function

Abstract

The invention belongs to the technical field of gas masks, particularly relates to a gas mask with a real-time operation state sensing function, solves the technical problems that an existing gas mask is single in detection information, poor in universality and inconvenient, and comprises a gas mask body, a canister, a state sensing device and a connecting hose. The canister is connected to the gas mask, and an electronic tag is arranged on the canister; the state sensing device comprises an MCU microprocessor, an RIFD non-contact read-write module, a toxic agent concentration detection module, a gas pressure difference detection module, a three-axis acceleration detection module, a sound-light alarm module, a display screen and key module, a DC power supply and a wireless Bluetooth communication module. On the basis of ensuring the protection performance of the gas mask, the state sensing device is used for detecting information such as expiration and inspiration actions, breathing air pressure change, breathing frequency and inspiration flow of a person, analyzing and judging the working state, carrying out sound-light alarm and wireless transmission, and reminding the person wearing the gas mask to evacuate from a contaminated area in time.

Description

Technical Field

[0001] The present invention relates to the technical field of gas masks, and in particular to a gas mask with a real-time operation status sensing function. Background Art

[0002] Gas masks are important equipment for respiratory protection, protecting personnel's head, face and respiratory tract from damage caused by toxic and harmful gases / substances. In operation, gas masks provide clean air to personnel through purification of gas filter canisters or external air sources, forming a "man-machine-environment" system. The status of the system in a complex environment is directly related to the safety of personnel's lives. Among them, the perception of status such as personnel load, equipment failure time, and equipment air tightness is limited by space, which has always been a technical problem in this field. The existing technology has the disadvantages of single detection information, poor versatility, and inconvenience, and there is still a large gap from practical application. Summary of the invention

[0003] In order to overcome the technical defects of existing gas masks such as single detection information, poor versatility and inconvenience, the present invention provides a gas mask with real-time operation status perception function.

[0004] The invention provides a gas mask with a real-time operation status sensing function, comprising a gas mask, a gas filter canister, a status sensing device and a connecting hose, wherein the gas filter canister is connected to the gas mask and an electronic tag is arranged on the gas filter canister; the status sensing device comprises an MCU microprocessor, an RIFD non-contact reading and writing module, a poison agent concentration detection module, a gas pressure difference detection module, a three-axis acceleration detection module, an audible and optic alarm module, a display screen and a key module, a DC power supply and a wireless Bluetooth communication module, wherein the RIFD non-contact reading and writing module, the poison agent concentration detection module, the gas pressure difference detection module, the three-axis acceleration detection module, the audible and optic alarm module, the display screen and the key module and the wireless Bluetooth communication module are respectively electrically connected to the MCU microprocessor, and the DC power supply supplies power to the status sensing device; wherein the poison agent air inlet of the poison agent concentration detection module and the exhalation air inlet of the gas pressure difference detection module are respectively arranged on the top of a housing of the status sensing device, the exhalation air inlet of the gas pressure difference detection module is connected to a breathing detection port of the gas mask through a connecting hose, and the antenna of the wireless Bluetooth communication module is located at the top of the housing of the status sensing device.

[0005] Preferably, the state sensing device detects the pressure difference between the inside and outside of the gas mask caused by the wearer's breathing in the working state in real time through the gas pressure difference detection module, and calculates the respiratory rate RR using formula ①, and calculates the inspiratory flow rate T using formula ② L ,

[0006] RR=60÷(T i -T i-1 ) ①

[0007] In formula ①, RR represents the respiratory rate value in bpm; T i Indicates the time when the pressure difference reaches the peak value, in seconds; T i-1 The time when the pressure difference peak was reached last time, in seconds;

[0008] T L =A×Δp 2 +B×Δp+C ②

[0009] In formula ②, T L Indicates the inspiratory flow rate, in L / min; ΔP indicates the pressure difference between the inside and outside of the mask, in Pa; A, B, and C all indicate constant coefficients;

[0010] The state sensing device determines whether the gas mask is leaking due to running by comparing the changes in the pressure difference inside the gas mask during breathing. The MCU microprocessor promptly reminds the wearer to adjust the mask through the sound and light alarm module.

[0011] The state sensing device detects the motion state of the wearer through the three-axis acceleration detection module, and evaluates the wearer's work ability level in combination with the obtained respiratory rate RR, where the work ability level is divided into four levels; at level I, the range of the respiratory rate RR is 8 to 24bpm, and the MCU microprocessor gives a "normal operation" prompt; at level II, the three-axis acceleration detection module detects that the wearer is in motion, and the range of the respiratory rate RR is 25 to 35bpm, then the MCU microprocessor gives a prompt of "feeling tired in the state of motion, you can continue to work, and you need to pay attention to your continuous physiological changes"; at level III, the three-axis acceleration detection module detects that the wearer is in motion, and the range of the respiratory rate RR is greater than or equal to 35bpm, then the MCU microprocessor gives a prompt of "reaching the body load limit, can perform short-term work, and should immediately rest or exit the work"; at level IV , the three-axis acceleration detection module detects that the wearer is in a stationary state, and the range of the respiratory rate RR is greater than 25bpm or less than 7bpm, then the MCU microprocessor gives a prompt of "the wearer is confused or unconscious, has no information exchange, cannot move independently, has no working ability, and urgently needs medical treatment"; in actual operation, the MCU microprocessor can display the prompt information on the display screen of the state sensing device, or transmit the prompt information to a writing terminal such as a mobile phone or a computer through a wireless Bluetooth communication module for real-time display; the state sensing device detects the concentration of the toxic agent in the environment through the toxic agent concentration detection module, combines the obtained inhalation flow and the bed adsorption kinetic parameters read from the electronic tag on the filter canister, calculates the total amount of toxic agent adsorbed by the filter canister in real time, and predicts the remaining protection time of the filter canister, and promptly reminds the operator to evacuate the toxic agent contaminated area, where the total adsorption calculation and early warning model is formula ③,

[0012] a0=a1+a2 ③ In formula ③, a0 represents the total initial adsorption amount of a certain agent by the canister, in mg; a1 represents the adsorption amount of the agent by the canister, in mg; a2 represents the remaining adsorbable amount of the agent by the canister, in mg;

[0013]

[0014] In formula ④, t0 represents the time when the mask is started to be worn, in min; t1 represents the time when the mask is finished to be worn, in min; C t Indicates the concentration of environmental toxicants in mg / L;

[0015]

[0016] In formula ⑤, t s Indicates the estimated remaining protection time of the canister against a certain poison, in minutes; It indicates the average inspiratory flow rate in the previous minute, in L / min; It indicates the average concentration of the poison in the environment in the previous minute, in mg / L; L indicates the height of the carbon layer of the canister, in cm; S indicates the cross-sectional area of ​​the carbon layer of the canister, in cm 2 ;k v It indicates the first-order adsorption rate constant of the canister for the poison, in min -1 ;c b The IDLH (Immediately Dangerous to Life and Health) concentration value specified for the agent, in mg / L.

[0017] Preferably, when in use, the state sensing device first reads the current canister information from the electronic tag of the canister, including the carbon layer cross-sectional area S of the canister, the carbon layer height L of the canister, the time t1 when the mask wearing ends, and the initial adsorption amount a0 of the current canister for a certain agent for different agents, the adsorption amount a1 of the current canister for the agent, and the primary adsorption rate constant k of the canister for the agent. v 、The IDLH (Immediately Dangerous to Life and Health) concentration value c of the agent b , and then determine whether the current gas filter canister has been used. If it has been used and the last protection object has physical adsorption and difficult-to-disintegrate antidotes, or the last protection object was only self-disintegrating antidotes but the interval time did not reach the specified limit, then the current gas filter canister is prohibited from use and must be replaced; for environments with multiple toxic agents, the final estimated remaining protection time of the gas filter canister is based on the shortest remaining protection time among various toxic agents.

[0018] Compared with the prior art, the technical solution provided by the present invention has the following technical effects: a gas mask with real-time operation status sensing function proposed by the present invention has a simple structure, low manufacturing cost, good portability, and strong practical applicability. On the basis of ensuring the effective protection time of the gas filter canister, only simple improvements need to be made to the traditional mask. On the basis of ensuring the protective performance of the gas mask, the state sensing device detects the exhalation and inhalation actions of the personnel, the changes in respiratory air pressure, the respiratory frequency, the inhalation flow rate and other information, analyzes and judges the operation status, and performs sound and light alarms and wireless transmission to remind the wearer to evacuate the contaminated area in time to ensure the life safety of the personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a structural schematic diagram of a gas mask with a real-time operation status sensing function described in an embodiment of the present invention;

[0022] Figure 2 A gas mask with a real-time operation status sensing function according to an embodiment of the present invention

[0023] In the figure: 1. Gas mask; 2. Gas filter canister; 3. Electronic tag; 4. Breathing detection port; 5. Connecting hose; 6. Exhalation air inlet; 7. Antenna; 8. Toxic agent air inlet; 9. Status sensing device; 10. Reading and writing area. DETAILED DESCRIPTION

[0024] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0025] In the description, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0027] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0028] In one embodiment, Figure 1 As shown, a gas mask with real-time operation status sensing function is disclosed, including a gas mask 1, a gas filter canister, a status sensing device 9 and a connecting hose 5, the gas filter canister is connected to the gas mask 1, and an electronic tag 3 is arranged on the gas filter canister; the status sensing device 9 includes an MCU microprocessor, a RIFD non-contact reading and writing module, a toxic agent concentration detection module, a gas pressure difference detection module, a three-axis acceleration detection module, an audible and visual alarm module, a display screen and a button module, a DC power supply and a wireless Bluetooth communication module, a RIFD non-contact reading and writing module, a toxic agent concentration detection module, a gas pressure difference detection module, a three-axis acceleration detection module The detection module, the sound and light alarm module, the display screen and the key module and the wireless Bluetooth communication module are electrically connected to the MCU microprocessor respectively, and the DC power supply supplies power to the state sensing device 9; wherein the poison inlet 8 of the poison concentration detection module and the exhalation inlet of the gas pressure difference detection module are respectively arranged on the top of the housing of the state sensing device 9, the exhalation inlet of the gas pressure difference detection module is connected to the breathing detection port 4 of the gas mask 1 through the connecting hose 5, and the antenna 7 of the wireless Bluetooth communication module is located at the top of the housing of the state sensing device 9; the read-write area 10 of the RIFD contactless read-write module is arranged on the housing of the state sensing device 9. In the specific embodiment of the DC power supply, a lithium battery is used.

[0029] On the basis of the above embodiments, in a preferred embodiment, the state sensing device 9 detects the pressure difference between the inside and outside of the gas mask 1 generated by the wearer's breathing in real time through the gas pressure difference detection module. According to the change law of the pressure difference during the breathing process, the exhalation and inhalation process can be clearly judged, and the respiratory frequency RR is calculated using formula ①, and the inhalation flow rate T is calculated using formula ②. L ,

[0030] RR=60÷(T i -T i-1 ) ①

[0031] In formula ①, RR represents the respiratory rate value in bpm; T i Indicates the time when the pressure difference reaches the peak value, in seconds; T i-1 The time when the pressure difference peak was reached last time, in seconds;

[0032] T L =A×Δp 2 +B×Δp+C ②

[0033] In formula ②, T L Indicates the inspiratory flow rate, in L / min; ΔP indicates the pressure difference between the inside and outside of the mask, in Pa; A, B, and C all indicate constant coefficients;

[0034] Ensuring that the gas mask is airtight when worn is a prerequisite for effective protection. The pressure difference inside the mask after the gas mask is worn correctly is significantly different from the leakage state. The state sensing device 9 determines whether the gas mask is leaking due to running by comparing the changes in the pressure difference inside the gas mask 1 during breathing. The MCU microprocessor promptly reminds the wearer to adjust the mask through the sound and light alarm module; the state sensing device 9 detects the motion state of the wearer through the three-axis acceleration detection module, and evaluates the wearer's operating ability level in combination with the obtained respiratory rate RR, and gives corresponding prompts in time to ensure the life safety of the personnel. The operating ability level is divided into four levels; at level I, the range of the respiratory rate RR is 8 to 24bpm, and the MCU microprocessor gives a "normal operation" prompt; at level II, the three-axis acceleration detection module detects that the wearer is in motion, and the range of the respiratory rate RR is 25 to 35bpm, then the MCU microprocessor The device gives a prompt of "feeling tired during exercise, but can continue to work, but need to pay attention to the continuous physiological changes"; at level III, the three-axis acceleration detection module detects that the wearer is in a state of exercise, and the range of the respiratory rate RR is greater than or equal to 35bpm, then the MCU microprocessor gives a prompt of "reaching the limit of physical load, can perform short-term work, should immediately rest or quit the work"; at level IV, the three-axis acceleration detection module detects that the wearer is in a static state, and the range of the respiratory rate RR is greater than 25bpm or less than 7bpm, then the MCU microprocessor gives a prompt of "the wearer is confused or unconscious when static, has no information exchange, cannot move independently, has no working ability, and urgently needs medical treatment"; in actual operation, the MCU microprocessor can display the prompt information through the display screen of the state sensing device 9, and can also transmit the prompt information to a writing terminal such as a mobile phone or a computer through a wireless Bluetooth communication module for real-time display;

[0035] The established early warning assessment model is as follows:

[0036] I_J=RR﹤25; II_D=(RR≧25)&&(RR﹤35);

[0037] III_D=RR﹥35; IV_J=(RR>25)||(RR﹤7);

[0038] Among them, I_J represents the evaluation conditions of level I; II_D represents the evaluation conditions of level II; III_D represents the evaluation conditions of level III; IV_J represents the evaluation conditions of level IV;

[0039] The state sensing device 9 detects the concentration of the toxic agent in the environment through the toxic agent concentration detection module, and calculates the total amount of toxic agent adsorbed by the filter canister in real time by combining the obtained inhalation flow rate and the bed adsorption kinetic parameters read from the electronic tag 3 on the filter canister, and predicts the remaining protection time of the filter canister, and promptly reminds the operating personnel to evacuate the toxic agent contaminated area, wherein the total adsorption amount calculation and early warning model is formula ③,

[0040] a0=a1+a2 ③ In formula ③, a0 represents the total initial adsorption amount of a certain agent by the canister, in mg; a1 represents the adsorption amount of the agent by the canister, in mg; a2 represents the remaining adsorbable amount of the agent by the canister, in mg;

[0041]

[0042] In formula ④, t0 represents the time when the mask is started to be worn, in min; t1 represents the time when the mask is finished to be worn, in min; C t Indicates the concentration of environmental toxicants in mg / L;

[0043]

[0044] In formula ⑤, t s Indicates the estimated remaining protection time of the canister against a certain poison, in minutes; It indicates the average inspiratory flow rate in the previous minute, in L / min; It indicates the average concentration of the poison in the environment in the previous minute, in mg / L; L indicates the height of the carbon layer of the canister, in cm; S indicates the cross-sectional area of ​​the carbon layer of the canister, in cm 2 ;k v It indicates the first-order adsorption rate constant of the canister for the poison, in min -1 ;c b The IDLH (Immediately Dangerous to Life and Health) concentration value specified for the agent, in mg / L.

[0045] On the basis of the above embodiments, in a preferred embodiment, when in use, the state sensing device 9 first reads the current canister information from the electronic tag 3 of the canister, including the carbon layer cross-sectional area S of the canister, the carbon layer height L of the canister, the time t1 for ending the wearing of the mask, and the initial total adsorption amount a0 of the current canister for a certain agent for different agents, the adsorption amount a1 of the current canister for the agent, and the primary adsorption rate constant k of the canister for the agent. v 、The IDLH (Immediately Dangerous to Life and Health) concentration value c of the agent b , and then determine whether the current gas filter canister has been used. If it has been used and the last protection object has physical adsorption and difficult-to-disintegrate antidotes, or the last protection object was only self-disintegrating antidotes but the interval time did not reach the specified limit, then the current gas filter canister is prohibited from use and must be replaced; for environments with multiple toxic agents, the final estimated remaining protection time of the gas filter canister is based on the shortest remaining protection time among various toxic agents.

[0046] The above is only a specific implementation of the present invention, which enables those skilled in the art to understand or implement the present invention. Although detailed descriptions are given with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.

Claims

1. A gas mask with a real-time operation status sensing function, comprising a gas mask (1), characterized in that: The device also comprises a gas filter canister (2), a state sensing device (9) and a connecting hose (5); the gas filter canister (2) is connected to the gas mask (1); an electronic tag (3) is arranged on the gas filter canister (2); the state sensing device (9) comprises an MCU microprocessor, an RIFD non-contact reading and writing module, a toxic agent concentration detection module, a gas pressure difference detection module, a three-axis acceleration detection module, an audible and visual alarm module, a display screen and a button module, a DC power supply and a wireless Bluetooth communication module, an RIFD non-contact reading and writing module, a toxic agent concentration detection module, a gas pressure difference detection module, a three-axis acceleration detection module The block, the sound and light alarm module, the display screen and the key module and the wireless Bluetooth communication module are electrically connected to the MCU microprocessor respectively, and the DC power supply supplies power to the state sensing device (9); wherein the poison agent air inlet (8) of the poison agent concentration detection module and the exhalation air inlet (6) of the gas pressure difference detection module are respectively arranged on the top of the housing of the state sensing device (9), the exhalation air inlet (6) of the gas pressure difference detection module is connected to the breathing detection port (4) of the gas mask (1) through a connecting hose (5), and the antenna (7) of the wireless Bluetooth communication module is located on the top of the housing of the state sensing device (9).

2. A gas mask with real-time operation status perception function according to claim 1, characterized in that: The state sensing device (9) detects the pressure difference between the inside and outside of the gas mask (1) generated by the wearer's breathing in the working state in real time through the gas pressure difference detection module, and calculates the respiratory frequency RR using formula ①, and calculates the inhalation flow rate T using formula ②. L , RR=60÷(T i -T i-1 ) ① In formula ①, RR represents the respiratory rate value in bpm; T i Indicates the time when the pressure difference reaches the peak value, in seconds; T i-1 The time when the pressure difference peak was reached last time, in seconds; T L =A×Δp 2 +B×Δp+C ② In formula ②, T L Indicates the inspiratory flow rate in L / min; ΔP represents the pressure difference between the inside and outside of the mask, in Pa; A, B, and C all represent constant coefficients; The state sensing device (9) determines whether the gas mask (1) is leaking due to running by comparing the change in the pressure difference inside the gas mask (1) during breathing, and the MCU microprocessor promptly reminds the wearer to adjust the mask through the sound and light alarm module; The state sensing device (9) detects the motion state of the wearer through a three-axis acceleration detection module, and evaluates the wearer's work ability level in combination with the obtained respiratory rate RR, wherein the work ability level is divided into four levels; at level I, the range of the respiratory rate RR is 8 to 24 bpm, and the MCU microprocessor gives a "normal operation" prompt; at level II, the three-axis acceleration detection module detects that the wearer is in a motion state, and the range of the respiratory rate RR is 25 to 35 bpm, and the MCU microprocessor gives a "feeling of fatigue in the motion state, can continue to work, and need to pay attention to its continuous physiological changes" prompt. In case of III, if the three-axis acceleration detection module detects that the wearer is in motion and the range of respiratory rate RR is greater than or equal to 35bpm, the MCU microprocessor will give a prompt of "reaching the limit of physical load, can perform short-term work, should immediately rest or quit the work"; in case of IV, if the three-axis acceleration detection module detects that the wearer is in a static state and the range of respiratory rate RR is greater than 25bpm or less than 7bpm, the MCU microprocessor will give a prompt of "confused or unconscious at rest, no information exchange, unable to act independently, no working ability, and urgent need for medical treatment"; The state sensing device (9) detects the concentration of the toxic agent in the environment through the toxic agent concentration detection module, and calculates the total amount of toxic agent adsorbed by the toxic agent canister (2) in real time by combining the obtained air intake flow rate and the bed adsorption kinetic parameters read from the electronic tag (3) on the toxic agent canister (2), and predicts the remaining protection time of the toxic agent canister (2), so as to promptly remind the operating personnel to evacuate the toxic agent contaminated area, wherein the total amount adsorption calculation and early warning model is formula ③, a0=a1+a2 ③ In formula ③, a0 represents the total initial adsorption amount of a certain poison by the canister (2), in mg; a1 represents the adsorption amount of the poison by the canister (2), in mg; a2 represents the remaining adsorbable amount of the poison by the canister (2), in mg; In formula ④, t0 represents the time when the mask is started to be worn, in min; t1 represents the time when the mask is finished to be worn, in min; C t Indicates the concentration of environmental toxicants in mg / L; In formula ⑤, t s It indicates the estimated remaining protection time of the canister (2) against a certain toxic agent, in minutes; It indicates the average inspiratory flow rate in the previous minute, in L / min; It represents the average concentration of the poison in the environment in the previous minute, in mg / L; L represents the height of the carbon layer of the canister (2), in cm; S represents the cross-sectional area of ​​the carbon layer of the canister (2), in cm 2 ;k v It represents the first-order adsorption rate constant of the canister (2) for the poison, in min -1 ;c b The IDLH concentration value specified for the agent, in mg / L.

3. A gas mask with real-time operation status perception function according to claim 2, characterized in that: When in use, the state sensing device (9) first reads the current information of the gas filter canister (2) from the electronic tag (3) of the gas filter canister (2), including the carbon layer cross-sectional area S of the gas filter canister (2), the carbon layer height L of the gas filter canister (2), the time t1 for ending the wearing of the mask, and the initial total amount a0 of the current gas filter canister (2) for a certain gas agent, the amount a1 of the current gas filter canister (2) for the gas agent, and the first-order adsorption rate constant k of the gas filter canister (2) for the gas agent. v 、The IDLH concentration value c specified for the agent b , then determine whether the current gas filter canister (2) has been used. If it has been used and the last protection object contained a physical adsorption type or a difficult-to-dissolve antidote, or the last protection object contained only a self-dissolving antidote but the interval time did not reach the specified limit, then the current gas filter canister (2) is prohibited from being used and the gas filter canister (2) is replaced. For environments where multiple toxic agents exist, the final estimated remaining protection time of the gas filter canister (2) is based on the shortest remaining protection time among the various toxic agents.

Images