CN114306968B - Power air supply air filtering respirator and control method thereof - Google Patents
Power air supply air filtering respirator and control method thereof Download PDFInfo
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Abstract
The invention provides a power air supply air filtering respirator and a control method thereof, wherein the power air supply air filtering respirator comprises a filter box, a power air supply system and a breathing mask, wherein the filter box is used for filtering air entering the power air supply system so that clean air enters the power air supply system; the power air supply system is used for actively supplying air and adjusting the air flow rate fed into the breathing mask; the power air supply system comprises: the environment data acquisition device, the fan and the air outlet state information acquisition device are arranged at the outlet of the air duct of the fan and used for detecting the air outlet state of the air duct and transmitting the air outlet state information to the main controller and the indicator. The power air supply respirator can automatically adjust the air quantity of the power air supply system according to the state of the filter box so as to ensure that the air quantity input into the respirator is constant.
Description
Technical Field
The invention relates to the technical field of safety protection equipment, in particular to a powered air supply air filtering respirator and a control method thereof.
Background
The traditional respirator filtering system lacks a high-efficiency air quantity adjusting device, cannot reliably control the air quantity entering a breathing mask or a head cover, and is poor in wearing experience of a user; meanwhile, due to the lack of effective monitoring on the use state of the filter box, related information about the service life and the filtering function strength of the filter box cannot be provided, so that the filter element cannot be replaced in a reasonable time, and harmful substances cannot be effectively filtered by using the same filter element for a long time or the filter element is replaced too frequently, so that the use cost is too high.
SUMMARY OF THE PATENT FOR INVENTION
In view of the above problems, the present invention aims to provide a powered air-supply air filtering respirator and a control method thereof, which are capable of adjusting the air intake in real time according to the change of the air outlet pressure of a powered air-supply system, so that the air flow entering into a respiratory mask is kept constant, and meanwhile, the life state of a filter box is judged according to the air outlet pressure and/or the toxic gas concentration of the powered air-supply system and indicated by an indicator, so that a user can conveniently know the state of the filter box in time to replace a filter element in a reasonable time. The invention aims at realizing the following technical scheme:
the invention provides a power air supply air filtering respirator, which comprises a filter box, a power air supply system and a breathing mask, wherein the filter box is used for filtering air entering the power air supply system so that clean air enters the power air supply system; the power air supply system is used for actively supplying air and adjusting the air flow rate fed into the breathing mask; the power air supply system comprises:
-an environmental data acquisition means for acquiring environmental parameters and transmitting the environmental parameters to the master;
-a fan for regulating the flow of air into the powered air supply system and for delivering air into the respiratory mask, the fan having a fan duct communicating to the respiratory mask;
the air outlet state information acquisition device is arranged at the outlet of the air duct of the fan and used for detecting the air outlet state of the air duct and transmitting the air outlet state information to the main controller;
the main controller is used for controlling the action of the fan to adjust the air quantity of the power air supply system and judging the service life state of the filter box;
-an indicator for receiving a master command indicating a state of life of the cartridge.
Further, the air outlet state information acquisition device comprises a wind pressure sensor and/or a gas detection sensor.
Further, the environmental data acquisition device comprises one or more of an environmental temperature sensor, an air pressure sensor and an environmental humidity sensor.
Further, the indicator comprises a display device and a warning device, and the display device indicates the service life state of the filter box according to signals transmitted by the main controller; the warning device sends out a warning signal when the service life state of the filter box is smaller than a preset warning threshold value.
Further, the power air supply system is provided with a Hall switch, a magnetic component is arranged on a pipeline connected with the air supply system by the breathing cover, and when the pipeline connection of the breathing cover and the air supply system is closed, the magnetic component triggers the closing of the Hall switch of the power air supply system so that the main controller enters a working state. Preferably, the Hall switch and the magnetic component are arranged at different corresponding positions of the connecting pipeline and the breathing mask so as to identify different types of breathing masks and pipelines.
Further, the power air supply system further comprises an alarm device, and when the main controller detects system fault information, for example, when the Hall switch is disconnected, the alarm device is triggered to send an alarm signal.
Further, the master has:
-an input module for receiving the environmental parameters transmitted by the environmental data acquisition device, the air-out state information transmitted by the air-out state acquisition device and the switching signals of the hall switch;
the comparison and calculation module is used for comparing the actually measured air outlet state information with the theoretical standard under the corresponding environment parameters, calculating the air quantity required to be input into the power air supply system and calculating and judging the service life state of the filter box;
-an output module for sending the state of life of the cartridge to an indicator and triggering an alarm device to emit an alarm signal under preset conditions;
-a control module for controlling the fan action to adjust the air volume into the powered air delivery system.
Further, the comparison calculation module has:
-a storage unit storing theoretical standard values of the air outlet pressure of the fan duct under different environmental parameters, theoretical life states under different outlet pressures and/or harmful gas concentrations;
-a state of life determining unit for determining a current state of life of the filter cartridge based on the outlet air pressure and/or the concentration of harmful gases;
-a calculation unit calculating an input air volume value that should be input to the powered air delivery system based on the outlet air pressure and the environmental parameters, and calculating the operating power of the fan based on the calculated input air volume value.
Further, the master controller is further provided with:
-a recording module for recording system operation information of the air supply system;
-a wireless communication module for transmitting the system operation information recorded by the recording module to an external receiver.
The invention further provides a control method of the power supply air filtering respirator, which controls the action of a fan according to the collected environmental parameters and air outlet state information to ensure that the air pressure at the outlet of a power supply system is constant, calculate and judge the service life state of the filter box and trigger an indicator to indicate the service life state of the filter box, wherein the environmental parameters comprise environmental temperature and environmental air pressure data, and the air outlet state information comprises air outlet pressure and/or harmful gas concentration information; preferably, the environmental parameter further comprises environmental humidity data.
Further, judging the life state of the filter box according to the detected concentration of the harmful gas: when the concentration of harmful gas is zero, judging that the service life state of the filter box is a normal service life state, and triggering a display device of an indicator to make a first state indication; when the concentration of the harmful gas is 0 percent < the time weighted allowable concentration in the harmful gas occupational contact limit value, judging that the life state of the filter box is a low life state, and triggering a display device of the indicator to make a second state indication; when the time weighted allowable concentration in the harmful gas occupational contact limit value is less than the short-time contact allowable concentration in the harmful gas occupational contact limit value, judging that the life state of the filter box is an end-of-life state, triggering the display device of the indicator to make a third state indication, and simultaneously triggering the warning device of the indicator to send a warning signal.
Further, the display device sends out three different light signals to perform first state indication, second state indication and third state indication, and the warning signal of the warning device comprises a sound signal.
Further, calculating and judging the service life state of the filter box according to the wind pressure value of the outlet of the fan air channel: and storing resistance values of outlet wind pressure corresponding to different blocking states of the outlet wind pressure of the power air supply system under different environment parameters and different fan powers obtained by adopting the particle pollutant loading test, and judging the service life state of the filter box according to the resistance values corresponding to the actually measured outlet wind pressure values in the running process of the power air supply system.
Further, when the system fault information is detected, an alarm device is triggered to alarm; the system fault information comprises information of disconnection of a Hall switch connecting the power air supply system and the breathing cover, information of short-time contact allowable concentration in harmful gas occupational contact limit value, information of abnormality of an environment parameter detection signal and information of abnormality of a fan air outlet state monitoring signal.
The invention has the beneficial effects that:
(1) The power air supply respirator can automatically adjust the air quantity of the power air supply system according to the state of the filter box so as to ensure that the air quantity input into the respirator is constant;
(2) The power air supply respirator can efficiently reflect the service life state information of the filter box, and can help the wearer to know the condition of the filter box, so that the wearer can replace the filter element in time according to the service life state of the filter box, and the use safety and convenience of the respirator are improved.
Drawings
FIG. 1 is a schematic illustration of a preferred embodiment of a powered air-supplying air-filtering respirator of example 1 of the present invention;
fig. 2 is a schematic diagram of embodiment 3 of the present invention before connection of a respiratory circuit with a hall switch;
FIG. 3 is a schematic illustration of the breathing circuit of FIG. 3 being connected;
FIG. 4 is a schematic diagram of a method according to embodiment 4 of the present invention;
FIG. 5 is a schematic diagram showing a method according to embodiment 5 of the present invention.
Detailed Description
The following description of the preferred embodiments of a powered air-fed air-filtering respirator and method of controlling the same will be made more complete and clear with reference to the accompanying drawings of embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, in the following description, the positional or positional relationship indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like are based on the positional or positional relationship shown in the drawings, and are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, in the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
Example 1:
the invention provides a power air supply air filtering respirator, which comprises a filter box 200, a power air supply system 100 and a breathing mask 300, wherein the filter box 200 is used for filtering air entering the power air supply system so that clean air enters the power air supply system; the power air supply system is used for actively supplying air and adjusting the air flow rate fed into the breathing mask; the power air supply system comprises:
an environmental data acquisition device 120 for acquiring environmental parameters and transmitting the environmental parameters to the master controller 102, in a preferred embodiment, the environmental data acquisition device 120 includes sensors such as an environmental temperature sensor 121, an air pressure sensor 122, and an environmental humidity sensor 123, which can reflect various information related to air quality parameters;
a fan 101 for regulating the air flow into the powered air supply system and delivering clean air into the breathing mask 300, the fan 101 and the breathing mask being in communication via a fan duct and a breathing conduit 310;
an air-out status information acquisition device 110, disposed at the outlet of the fan duct, for detecting the air-out status of the duct and transmitting the air-out status information to the main controller 102, in a preferred embodiment, the air-out status information acquisition device 110 includes a wind pressure sensor 111 and a gas detection sensor 112;
a main controller 102, configured to control the fan 101 to operate and adjust the air volume of the power air supply system, and calculate and determine the life state of the filter box according to air-out state information and environmental parameters, where the environmental parameters include environmental temperature, environmental air pressure data, environmental humidity data, etc., and the air-out state information includes air-out pressure, harmful gas concentration information, etc.;
-an indicator 130 for receiving a master command indicating a state of life of the cartridge, said indicator 130 comprising display means 131 and warning means 132, said display means 131 displaying a state of life value of the cartridge according to a signal transmitted by the master; the warning device 132 sends out a warning signal when the life state of the filter cartridge is smaller than a preset warning threshold, and in a preferred embodiment, the warning device 132 adopts an acoustic prompt device, such as a buzzer.
After the system is started, the fan power supply is connected under the control of the main controller 102, the air outlet state information acquisition device 110 starts to work, dirty air containing particulate matters from the outside enters the power air supply system 100 through the filter box 200 under the suction action of the fan 101, and the purified air enters the breathing cover 300 through the air channel of the fan 101 and is breathed by a user through the breathing pipeline 310.
In a preferred embodiment, the fan power supply of the powered air delivery system 100 is powered by a battery 400, the battery 400 having a battery management system.
In a preferred embodiment, the master controller 102 regulates the operation of the blower 101 to maintain a constant flow of air into the respiratory mask 300.
In a preferred embodiment, an alarm device 132 is further provided, and when the master controller 102 detects that the power air supply system is disconnected from the breathing mask, the concentration of harmful gas is too high, various sensor signals are abnormal, and other system faults, the alarm device is triggered to send an alarm signal.
In a preferred embodiment, the power air supply system 100 is further provided with a real-time clock for prompting time, a control key 104 for man-machine interaction, a memory chip for storing information, a bluetooth chip for transmitting data outwards, and the like, wherein the control key 104 comprises a gear adjusting device for adjusting the air intake intensity of the power air supply system.
Example 2:
the present embodiment provides a master controller suitable for implementing the functions of embodiment 1, the master controller having:
-an input module for receiving the environmental parameters transmitted by the environmental data acquisition device, the air-out state information transmitted by the air-out state acquisition device, and related information of system operation such as the switching signals of the hall switch;
the comparison and calculation module is used for comparing the difference between the actually measured air outlet state information and the theoretical standard under the corresponding environment parameters and calculating and judging the air quantity required to be input into the power air supply system and the service life state of the filter box;
-an output module for sending the state of life of the cartridge to an indicator and triggering an alarm device to emit an alarm signal when a preset condition is reached;
-a control module for controlling the fan action to adjust the air volume into the powered air delivery system.
Wherein the comparison calculation module has:
-a storage unit storing theoretical standard values of the air outlet pressure of the fan duct under different environmental parameters, theoretical life states under different outlet pressures and/or harmful gas concentrations;
-a life state determining unit for determining the remaining life of the current state of the filter cartridge based on the outlet air pressure and/or the concentration of harmful gases;
-a calculation unit calculating an input air volume value that should be input to the powered air delivery system based on the outlet air pressure and the environmental parameters, and calculating the operating power of the fan based on the calculated input air volume value.
In a preferred embodiment, the master controller 102 is further provided with:
-a recording module for recording system operation information of the air supply system;
-a wireless communication module for transmitting the system operation information recorded by the recording module to an external receiver.
Example 3:
the embodiment provides a device for identifying connection between a power air supply system and a respiratory mask, as shown in fig. 2 and 3, the device comprises a hall switch 103, a magnetic member 313 is arranged on a joint 311 of a pipeline 310 connected between the respiratory mask 300 and a fan air outlet duct of the air supply system, and when the respiratory mask 300 is connected and closed with the power air supply system 100, the hall switch 103 is triggered to be closed so that the main controller 102 enters a working state. As shown in fig. 3, when the pipeline passes, the hall switch 103 is closed under the action of the magnet 313 and transmits a signal to the main controller 102, and the main controller 102 makes an analysis judgment based on the data stored in the memory chip or the memory unit and lights the corresponding indicator lamp.
In the preferred embodiment, the hall switch 103 and the magnetic component 313 are arranged at different corresponding positions of the pipeline and the breathing mask of the power air supply system, so that when the positions of the magnetic components and the hall switch of the breathing mask and the pipeline are not corresponding, the hall switch cannot be triggered to be closed, the model of the pipeline and the breathing mask can be conveniently and rapidly identified, and the danger caused by that the system air quantity is inconsistent with the actual application environment due to the fact that the pipeline and the breathing mask are not corresponding in application is avoided.
Example 4:
the present embodiment provides a method for adjusting the air volume of a power air supply system and indicating the life state of a filter box by using the devices in embodiment 1 and embodiment 2, and in this embodiment, the life state of the filter box is calculated and judged according to the air pressure value of the outlet of an air duct of a fan: and storing resistance values of outlet wind pressure corresponding to different blocking states of the outlet wind pressure of the power air supply system under different environment parameters and different fan powers obtained by adopting the particle pollutant loading test, and judging the service life state of the filter box according to the resistance values corresponding to the actually measured outlet wind pressure values in the running process of the power air supply system.
Specifically, as shown in fig. 4, the method for indicating the life state of the filter box is that firstly, loading particles on the HE (particle filtering) filter box, respectively recording the resistance value of blocking from 0% to 100% (according to national standard), then dividing the whole loading time into 4 equal parts, recording each corresponding resistance value as 100%, 75%, 50%, 25%, 0% of the life state of the filter box, and testing the outlet wind pressure value detected by the wind pressure sensor 111 of the filter box 200 under different wind volumes in a plurality of different gear positions according to each blocking value, namely, the resistance value 1, the resistance value 2, the resistance value 3, the resistance value 4 and the resistance value 5 as shown in the figure, and writing the outlet wind pressure value under different wind volumes into a storage unit or a storage chip; in actual use, the wind pressure sensor 111 continuously detects the outlet wind pressure of the fan, the main controller 102 judges the life state of the filter box based on the outlet wind pressure value detected by the wind pressure sensor 111, and outputs the life state of the filter box to the display device 131 according to the segmentation result, if the life of the filter box is displayed as 100%, the resistance value 1< the outlet wind pressure value < the resistance value 2; if the life state of the filter box is 75%, the resistance value is 2< the outlet wind pressure value < the resistance value is 3; if the life state of the filter box is 50%, indicating that the resistance value is 3< the outlet wind pressure value is 4; if the life state of the filter box is 25%, indicating that the resistance value is 4< the outlet wind pressure value < the resistance value is 5; if the life state of the filter box is 0%, the resistance value is 5< the pressure value; the main controller 102 outputs the result to the display device 131, and triggers the warning device 132 to send out warning information when the life state of the filter cartridge is 0%.
In the present invention, the automatic air volume adjusting function is required to maintain a constant air volume output into the breathing mask 300 when the resistance of the inhaled air of the filter cartridge 200 increases or when the external temperature or pressure changes; the realization mode is that the factory standard pressure value of the fan is respectively measured through 104 according to the three-gear flow of the respiratory mask 300 in the standard factory environment, and the factory standard pressure value is stored in a storage chip or a storage unit; when the system is used, the main controller 102 obtains the on-site ambient pressure and ambient temperature values transmitted by the temperature sensor 121 and the air pressure sensor 122, calculates an outlet air pressure standard value P required under the actual working condition according to an ideal gas equation, and simultaneously obtains an outlet air pressure value P1 transmitted by the air pressure sensor 111, calculates and adjusts parameters such as the rotating speed of the fan through the calculation module to enable the outlet air pressure value P1 to be equal to P, and the air quantity of the power air supply system at the moment is the air quantity value required under the working condition.
In addition, when the filter box falls off, the alarm device 133 needs to be triggered to send an alarm signal, when the product is impacted by unexpected conditions, the filter box falls off, if the user does not timely find the device, the user can be injured if the device is continuously used, so that the unexpected occurrence can be greatly reduced when the filter box falls off for alarm; the unused filter boxes read different standard outlet wind pressure values P4 transmitted by the corresponding wind pressure sensors 111 under different wind volumes and store the different standard outlet wind pressure values P4 into a memory chip or a memory unit; when the filter cartridge 200 falls off, the air volume of the fan rises rapidly, the outlet air pressure value P5 detected by the air pressure sensor 111 also rises rapidly, the outlet air pressure value is transmitted to the main controller 102 for operation, and when the sudden P5>1.1P4, the filter cartridge is judged to fall off, and meanwhile, the alarm device 133 is driven to send out a corresponding alarm signal.
Example 5:
the present embodiment provides a method for calculating the life state of the filter cartridge suitable for embodiments 1 and 2, wherein the method of this embodiment is to judge the life state of the filter cartridge according to the detected concentration of the harmful gas, and the display device of the indicator in this embodiment includes a bulb or a lamp tube displaying different colors.
When the powered air supply air filtering respirator of the invention is used, filtered air flows through the fan of the fan 101, then the concentration of harmful gas is detected by the gas detection sensor 112 in the air outlet channel of the fan 101 (different types of gas sensors are needed to detect different harmful gases according to specific different use situations), and data are transmitted to the main controller 102 in real time for analysis and calculation, as shown in fig. 5, a graph diagram showing the change of the gas penetration condition with time during the same harmful gas monitoring is shown, according to the occupational limit value requirement of different harmful gas concentrations in GBZ-2019, the time weighted allowable concentration in the occupational contact limit value of different harmful gases is stored in a memory or a storage unit in advance, and the service life state is judged according to the actually measured harmful gas concentration when the system is in operation, and the service life state is specifically: when the concentration of harmful gas is zero, judging that the service life state of the filter box is a normal service life state, and triggering a display device of an indicator to make a first state indication, for example, a green light is turned on for indication; when the concentration of the harmful gas is 0 percent < the time weighted allowable concentration in the harmful gas occupational contact limit value, judging that the service life state of the filter box is a low service life state, and triggering a display device of an indicator to make a second state indication, such as a yellow lamp to be lighted for indication; when the time weighted allowable concentration in the harmful gas occupational contact limit value is less than the short-time contact allowable concentration in the harmful gas occupational contact limit value, judging that the life state of the filter box is the life end state, triggering the display device of the indicator to make a third state indication, for example, using a red light to light for indication, and triggering the warning device of the indicator to send a warning signal.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention as defined by the appended claims; the dimensions in the drawings and the embodiments are irrelevant to specific objects, are not used for limiting the protection scope of the invention, and the objects can be selected and changed according to actual needs.
Claims (8)
1. The power air supply filtering respirator is characterized by comprising a filter box, a power air supply system and a breathing mask, wherein the filter box is used for filtering air entering the power air supply system so that clean air enters the power air supply system; the power air supply system is used for actively supplying air and adjusting the air flow rate fed into the breathing mask; the power air supply system comprises:
-an environmental data acquisition device for acquiring environmental parameters and transmitting the environmental parameters to the master controller, the environmental data acquisition device comprising an environmental temperature sensor, an air pressure sensor;
-a fan for regulating the flow of air into the powered air supply system and for delivering air into the respiratory mask, the fan having a fan duct communicating to the respiratory mask;
the air outlet state information acquisition device is arranged at the outlet of the air duct of the fan and used for detecting the air outlet state of the air duct and transmitting the air outlet state information to the main controller, and the air outlet state information acquisition device comprises a wind pressure sensor and/or a gas detection sensor;
the main controller is used for controlling the action of the fan to adjust the air quantity of the power air supply system and judging the service life state of the filter box; the master has:
the comparison and calculation module is used for comparing the actually measured air outlet state information with the theoretical standard under the corresponding environment parameters, calculating the air quantity required to be input into the power air supply system and calculating and judging the service life state of the filter box; the comparison calculation module has:
-a storage unit storing theoretical standard values of the air outlet pressure of the fan duct under different environmental parameters, theoretical life states under different outlet pressures and/or harmful gas concentrations;
-a state of life determining unit for determining a current state of life of the filter cartridge based on the outlet air pressure and/or the concentration of harmful gases;
the calculation unit calculates an input air quantity value which is required to be input into the power air supply system according to the air outlet pressure and the environmental parameters, calculates the running power of the fan according to the calculated input air quantity value, obtains the environmental temperature sensor and the on-site environmental pressure and environmental temperature value transmitted by the air pressure sensor by the main controller, calculates an outlet air pressure standard value required under the actual working condition according to an ideal gas equation, simultaneously obtains an outlet air pressure value transmitted by the air pressure sensor, and calculates and adjusts the rotating speed of the fan through the calculation module so that the outlet air pressure value is equal to the outlet air pressure standard value;
-a recording module for recording system operation information of the air supply system;
-a wireless communication module for transmitting the system operation information recorded by the recording module to an external receiver;
-an indicator for receiving a master command indicating the state of life of the cartridge, comprising a display device and a warning device, said display device indicating the state of life of the cartridge according to a signal transmitted by the master; the warning device sends out a warning signal when the service life state of the filter box is smaller than a preset warning threshold value.
2. The powered air-supply air filtering respirator of claim 1, wherein the powered air-supply system is provided with a hall switch, and a magnetic member is arranged on a pipeline connected with the air-supply system by the breathing mask, and when the pipeline connection of the breathing mask and the air-supply system is closed, the magnetic member triggers the hall switch of the powered air-supply system to be closed so as to enable the main controller to enter an operating state.
3. The powered air-supply air-filtering respirator of claim 2, wherein the powered air-supply system further comprises an alarm device that is triggered to emit an alarm signal when the master controller detects a system fault message.
4. The powered air-supply air-filtering respirator of claim 3, wherein the master controller further has:
-an input module for receiving the environmental parameters transmitted by the environmental data acquisition device, the air-out state information transmitted by the air-out state acquisition device and the switching signals of the hall switch;
-an output module for sending the state of life of the cartridge to an indicator and triggering an alarm device to emit an alarm signal when a preset condition is reached;
-a control module for controlling the fan action to adjust the air volume into the powered air delivery system.
5. The control method of the power supply air filtering respirator is characterized in that the power supply air filtering respirator according to any one of claims 1-4 is adopted, the action of a fan is controlled according to collected environmental parameters and air outlet state information, so that the outlet air pressure of a power supply system is constant, the service life state of a filter box is calculated and judged, and an indicator is triggered to indicate the service life state of the filter box, wherein the environmental parameters comprise environmental temperature and environmental air pressure data, and the air outlet state information comprises air outlet pressure and/or harmful gas concentration information; the method for controlling the fan action comprises the steps of comparing the actually measured air outlet state information with theoretical standards under corresponding environment parameters, calculating the air quantity required to be input into a power air supply system, obtaining the environment pressure and the environment temperature value of the site transmitted by an environment temperature sensor and an air pressure sensor, calculating the required outlet air pressure standard value under the actual working condition according to an ideal air equation, simultaneously obtaining the outlet air pressure value transmitted by the air pressure sensor by a main controller, and calculating and adjusting the rotating speed of the fan by a calculation module to enable the outlet air pressure value to be equal to the outlet air pressure standard value; judging the service life state of the filter box according to the detected concentration of the harmful gas: when the concentration of harmful gas is zero, judging that the service life state of the filter box is a normal service life state, and triggering a display device of an indicator to make a first state indication; when the concentration of the harmful gas is 0 percent < the time weighted allowable concentration in the harmful gas occupational contact limit value, judging that the life state of the filter box is a low life state, and triggering a display device of the indicator to make a second state indication; when the time weighted allowable concentration in the harmful gas occupational contact limit value is less than the short-time contact allowable concentration in the harmful gas occupational contact limit value, judging that the life state of the filter box is an end-of-life state, triggering the display device of the indicator to make a third state indication, and simultaneously triggering the warning device of the indicator to send a warning signal.
6. The method of claim 5, wherein the display device emits three different light signals for a first status indication, a second status indication, and a third status indication, and wherein the warning signal of the warning device comprises an audible signal.
7. The control method of the power supply air filtering respirator is characterized in that the power supply air filtering respirator according to any one of claims 1-4 is adopted, the action of a fan is controlled according to collected environmental parameters and air outlet state information, so that the outlet air pressure of a power supply system is constant, the service life state of a filter box is calculated and judged, and an indicator is triggered to indicate the service life state of the filter box, wherein the environmental parameters comprise environmental temperature and environmental air pressure data, and the air outlet state information comprises air outlet pressure and/or harmful gas concentration information; the method for controlling the fan action comprises the steps of comparing the actually measured air outlet state information with theoretical standards under corresponding environment parameters, calculating the air quantity required to be input into a power air supply system, obtaining the environment pressure and the environment temperature value of the site transmitted by an environment temperature sensor and an air pressure sensor, calculating the required outlet air pressure standard value under the actual working condition according to an ideal air equation, simultaneously obtaining the outlet air pressure value transmitted by the air pressure sensor by a main controller, and calculating and adjusting the rotating speed of the fan by a calculation module to enable the outlet air pressure value to be equal to the outlet air pressure standard value; calculating and judging the service life state of the filter box according to the wind pressure value of the outlet of the fan air channel: and storing resistance values of outlet wind pressure corresponding to different blocking states of the outlet wind pressure of the power air supply system under different environment parameters and different fan powers obtained by adopting the particle pollutant loading test, and judging the service life state of the filter box according to the resistance values corresponding to the actually measured outlet wind pressure values in the running process of the power air supply system.
8. The method of controlling a powered air moving air filtering respirator of claim 7, wherein the alarm device is triggered to alarm when system failure information is detected; the system fault information comprises information of disconnection of a Hall switch connecting the power air supply system and the breathing cover, information of short-time contact allowable concentration in harmful gas occupational contact limit value, information of abnormality of an environment parameter detection signal and information of abnormality of a fan air outlet state monitoring signal.
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