CN111701158A - Electric breathing apparatus and its air filter device - Google Patents

Abstract

The present application discloses an electric breathing apparatus and an air filter device thereof. The latter includes a main unit, and the main unit includes a casing; and an air filter box detachably connected to the main unit, and the casing includes a cross section facing the air filter box when the main unit is connected to the air filter box. Interface, the shell of the air filter box includes a filter screen surface facing the host when the host is connected to the air filter box, the shell of the host also includes a first group of Hall sensors located in the interface, and the first group of Hall sensors includes N mutual Spaced Hall sensors, where N is an integer greater than or equal to 2, and the housing of the air filter box also includes N alignment positions located in the screen surface. When the air filter box is connected to the housing of the host, N alignment positions The positions are aligned with the N Hall sensors respectively. The air filter box includes one or N magnetic pieces selectively arranged at the N alignment positions. The arrangement of the magnetic pieces at the N alignment positions is the same as that of the host for the air filter box. corresponding to the operation mode.

Description

Electric breathing apparatus and its air filter device

technical field

The present application relates generally to powered breathing apparatus, and particularly to air filtration devices for powered breathing apparatus.

Background technique

As a component of a life environment support system, electric breathing equipment is widely used in various harmful occasions, so as to ensure that users can breathe clean air safely and reliably in sites that are harmful to human health, such as in harsh welding work sites. Or even at emergency medical diagnosis sites where there is a risk of respiratory disease transmission, etc.

Electric breathing equipment generally includes a host that can be worn on the waist of the human body, a filter box detachably installed on the host, a breathing mask (for welding sites, a welding mask), and a connecting pipe between the host and the breathing mask. . The ambient air is filtered and inhaled into the main body through the filter box driven by the components in the main body, and then supplied to the breathing mask through the connecting pipe for the user to inhale.

As a consumable, the filter box must be replaced after a certain period of use. However, if the filter box is installed on the main unit but is not properly installed, the air that has not been effectively filtered is likely to be inhaled into the main unit and inhaled by the user through the connecting pipe, resulting in health damage. In a busy construction or work site, users often have no time to check whether the filter box is installed in place after installing the filter box on the host, so it is necessary to avoid this situation. Otherwise, if the connection tube and the main unit are not installed in place and the main unit is started rashly, the user will breathe harmful air and cause health damage.

In addition, users may need to work in different workplaces after purchasing electric breathing equipment. Since different work occasions need to be equipped with different filter boxes and the operation mode of the host needs to be reset accordingly for different filter boxes, the user is often required to manually adjust the host configuration. However, this puts forward higher requirements on the user's operating proficiency, which is not conducive to the user's ability to quickly adapt to changing workplaces with electric breathing equipment.

SUMMARY OF THE INVENTION

In view of the above problems, the present application proposes an improved electric breathing apparatus, which can ensure that the various components of the electric breathing apparatus can be activated only when they are installed in place with each other, and different filter boxes can be automatically adjusted after being assembled. The operating mode of the host brings great convenience to users.

According to one aspect of the present application, there is provided an air filter device for an electric breathing apparatus, comprising:

a main unit, the main unit includes a housing in which an electric fan is arranged; and

An air filter box detachably connected to the host, the shell of the host includes an interface facing the air filter box when the host is connected to the air filter box, the air filter box has a shell, so The shell of the air filter box includes a screen surface facing the host when the host is connected to the air filter box, and the shell of the host also includes a first group of Hall sensors located in the interface, so the The first group of Hall sensors includes N Hall sensors spaced apart from each other, wherein N is an integer greater than or equal to 2, and the housing of the air filter box also includes N alignment positions located in the filter screen surface, When the air filter box is connected to the housing of the host, the N alignment positions are aligned with the N Hall sensors respectively, and the air filter box includes selecting the N alignment positions at the N alignment positions. One or N magnetic pieces are arranged in a flexible manner, and the arrangement manner of the magnetic pieces at the N alignment positions corresponds to the operation manner of the host computer for the air filter box.

Optionally, the magnetic elements have 2 ^N -1 arrangement patterns at the N alignment positions.

Optionally, the Hall sensor is hidden in the housing of the host; and/or the magnetic element is hidden in the housing of the air filter box.

Optionally, the housing of the host further includes a second set of Hall sensors located in the interface, the second set of Hall sensors includes at least one Hall sensor, and the housing of the air filter box further includes Including at least one additional alignment position located in the screen surface, when the air filter box and the host are installed in place, the at least one additional alignment position and the second group of Hall sensors. The Hall sensors are respectively aligned, and an additional magnetic member is correspondingly provided at each of the at least one additional alignment position.

Optionally, the shell of the host includes a circle of first flanges around the interface, and the shell of the air filter box includes a circle of second flanges around the filter screen surface. The first flange fully contacts the second flange when the cartridge is in place with the host.

Optionally, the first group of Hall sensors and/or the second group of Hall sensors are located in the area surrounded by the first flange, and/or, the N alignment positions and/or The at least one additional alignment location is located within the area enclosed by the second flange.

Optionally, the air filter device further includes a connection port to be detachably connected to the joint of the connecting hose of the electric breathing apparatus, the connection port is configured with a third group of Hall sensors, the third group of Hall sensors The sensor includes at least one Hall sensor, the connector includes at least one additional alignment position, and the connector includes at least one additional alignment position with the third set when the connector is in place with the connection port. The Hall sensors of the Hall sensors are respectively aligned, and an additional magnetic element is correspondingly provided at each of the at least one additional alignment position of the joint.

Optionally, the magnetic member includes magnetic beads or magnetic sheets made of permanent magnet material.

According to another aspect of the present application, there is also provided an air filter device for an electric breathing apparatus, comprising:

a main unit, the main unit includes a housing in which an electric fan is arranged; and

An air filter box detachably connected to the host, the shell of the host includes an interface facing the air filter box when the host is connected to the air filter box, the air filter box has a shell, so The shell of the air filter box includes a filter screen surface facing the host when the host is connected to the air filter box, the shell of the host also includes a first group of proximity switches located in the interface, the The first group of proximity switches includes N proximity switches that are spaced apart from each other, where N is an integer greater than or equal to 2, and the housing of the air filter box also includes N alignment positions located in the filter screen surface. When the air filter box is connected to the shell of the host, the N alignment positions are aligned with the N proximity switches respectively, and the air filter box includes one selectively arranged at the N alignment positions. Or N counterparts that can interact with the proximity switch, and the arrangement of the counterparts at the N alignment positions corresponds to the operation manner of the host for the air filter box.

According to another aspect of the present application, there is also provided an electric breathing apparatus, comprising:

the aforementioned air filter device;

respirator; and

A connecting hose connecting between the breathing mask and the air filter device.

According to another aspect of the present application, there is also provided an operating method according to the aforementioned air filter device, comprising:

Connect the air filter box to the host;

On the premise that the N alignment positions of the air filter box are aligned with the N Hall sensors of the first group of Hall sensors of the host, where N is an integer greater than or equal to 2, using the N A number of Hall sensors monitor the presence of magnetic elements in the N alignment positions;

Comparing the monitoring result with the pre-stored distribution of magnetic parts to determine the model of the air filter box;

Based on the model of the air filter box, change the operation mode of the main unit.

Optionally, after connecting the air filter box with the host and before determining the model of the air filter box, monitor whether the second group of Hall sensors of the host is in an additional state with the air filter box. The additional magnetic piece at the aligning position is aligned to determine whether the air filter box is installed in place on the host.

Optionally, if the air filter box is not in place on the main unit, an alarm is issued and/or the operation of the main unit is stopped.

By using the above technical means of the present application, not only can the air filter box and the host, the connecting hose and the air filter device are installed in place, but also the model of the air filter box can be automatically identified to reset the operation mode of the host, thereby improving the cost of Reliability and convenience of use of the applied electric breathing apparatus.

Description of drawings

The principles and various aspects of the present application will be more fully understood from the following detailed description, taken in conjunction with the accompanying drawings. It should be noted that the scales of the drawings may be different for the purpose of clear description, but this will not affect the understanding of the present application. In the attached image:

Fig. 1 schematically shows an electric breathing apparatus according to an embodiment of the present application;

2 is a perspective view schematically illustrating a filter cartridge of a powered breathing apparatus according to an example of the present application;

Fig. 3 is a perspective view schematically showing the main body of the electric breathing apparatus according to an example of the present application;

Fig. 4 schematically shows the main engine of the electric breathing apparatus according to an example of the present application, wherein the main engine is to be connected with the joint of the connecting tube;

FIG. 5 schematically shows a combination of magnetic parts according to an example of the present application;

FIG. 6 schematically shows a control operation method according to an example of the present application.

Detailed ways

In the various figures of the present application, structurally identical or functionally similar features are denoted by the same reference numerals.

Figure 1 schematically illustrates a powered breathing apparatus 100 according to one embodiment of the present application. The electric breathing apparatus 100 mainly includes an air filter device 200 , a breathing mask 400 , and a connecting hose 300 connected between the air filter device 200 and the breathing mask 400 . The air filter device 200 is worn by the user, for example, around the waist. The respiratory mask 400 is worn on the head by the user. For example, the respiratory mask 400 may be a medical quarantine mask, a gas mask, a welding mask, or the like. The air filter device 200 is driven by an internal electric fan (described below) to inhale and filter air from the environment, and then provides it to the respiratory mask 400 through the connecting hose 300 for inhalation by the user.

The air filter device 200 has a connection port 210 for detachably connecting with the connector 310 of the connection hose 300 . It should be clear to those skilled in the art that the shape of the connection port 210 is not limited to the form shown in FIG. 1 , and can also be other shapes (as shown in FIGS. 3 and 4 ); similarly, the connector 310 can be in the form shown in FIG. 1 or 3 . 4 or any other suitable shape, as long as the connection port 210 and the connector 310 can be detachably connected as described later.

Further referring to FIGS. 2 and 3 , according to an example of the present application, the air filter device 200 includes a main body 220 and an air filter box 230 , which can be detachably connected to each other. Host 220 includes housing 2210 . For example, the connection port 210 of the air filter device 200 is located in the housing 2210 . An interior space is defined in housing 2210 to accommodate electric fan 2220 (only partially visible in Figure 2). In addition, an air inlet 2230 is also formed in the casing 2210 . The housing 2210 is configured so that when the fan 2220 is powered on and started, the gas can be sucked into the inner space where the fan 2220 is located through the suction port 2230 , and discharged out through the connection port 210 . For the power supply of the fan, a rechargeable battery 240 is detachably connected to the housing 2210 . The host 220 includes a display screen 2214 for displaying various parameters and control buttons 2215 for controlling the relevant components in the host 220, such as the fan 2220.

The suction port 2230 is formed in one interface 2211 of the housing 2210. A ring of flanges 2212 is provided around the interface 2211 . For example, the ring of flange 2212 may be integrally formed with the housing 2210 or may also be formed of a resilient sealing material and then attached to the surface of the housing 2210. At the same time, a plurality of snap portions, such as three snap portions 2213a, 2213b, 2213c, are respectively formed on the outer surface of the housing 2210 near the ring of flanges 2212.

The air filter box 230 includes a housing 2310, generally in the shape of a square box. It should be apparent to those skilled in the art that the housing 2310 may also adopt other suitable shapes, such as a flat shape and the like. As further shown in FIG. 3 , the housing 2310 of the air filter box 230 internally defines a space for accommodating a filter medium (not shown in the figure). Depending on where the powered breathing apparatus 100 is to be used, the filter media will vary. A filter screen surface 2311 is formed on the casing 2310 . Contrary to the filter screen surface 2311, a suction surface (not shown in FIG. 3) is also formed on the housing 2310, and a plurality of orifices are formed in the suction surface, so that the air can only pass through the suction The surface is filtered by the filter medium and then discharged from the filter surface 2311.

A ring of flanges 2312 is also provided around the screen surface 2311 . For example, the ring of flange 2312 may be integrally formed with the housing 2310 or may also be formed of a resilient sealing material and then attached to the surface of the housing 2310. In addition, a plurality of snap portions, such as three snap portions 2313a, 2313b, 2313c, are respectively formed on the outer surface of the housing 2310 near the ring of flanges 2312. The snap portions 2313a, 2313b, 2313c of the air filter box 230 are paired with the snap portions 2213a, 2213b, 2213c of the host 220, so that the air filter box 230 can be snap-connected on the on host 220. When the air filter box 230 is correctly connected with the host 220 (ie, installed in place), the filter surface 2311 of the air filter box 230 and the interface 2211 of the host 220 are opposite to each other; The edges 2212 are in complete contact with each other to form a sealing mating surface. In this way, it can be ensured that the air filtered by the air filter box 230 is driven into the air inlet 2230 of the host 220 without contacting with the outside world.

However, in the case where the air filter box 230 and the host 220 are not installed in place, although the snap parts 2313a, 2313b, 2313c and the snap parts 2213a, 2213b, 2213c may be engaged with each other to connect the air filter box 230 and the host 220 together , but the flange 2312 of the air filter box 230 and the flange 2212 of the host 220 may not completely contact each other. In this way, a gap that may exist between flange 2312 and flange 2212 can cause harmful ambient air to be drawn into main unit 220 and then by the user.

In addition, as mentioned above, the filter media of the air filter box are different for different application occasions, which means that for the air filter box with different filter media, the operation mode of the fan of the host is different. For example, the speed of the fan, the interval operation time period, etc. will be different. Therefore, in the prior art, it is required that the user must manually reset the operation mode of the main engine, especially its fan, after changing a different air filter box. This will firstly increase the complexity of the user's use of the electric breathing apparatus, and secondly, if the user forgets to reset the main unit, there is a risk that the inhaled air will not be clean enough.

In view of the above problems, according to the technical solution of the present application, a plurality of proximity switches spaced apart from each other are arranged between the air filter box 230 and the host 220, so that only when these proximity switches are all correctly identified as counterparts that cooperate with them , it is considered that the air filter box 230 and the host 220 have been installed in place, and according to the identification combination of the proximity switch, the type of the air filter box 230 is automatically recognized and the matching host 220, especially the host machine, is automatically reset accordingly. How the fan 2220 operates.

In the embodiment of the present application, the above-mentioned proximity switch is preferably a Hall sensor, so the following description only takes the Hall sensor as an example. However, it should be clear to those skilled in the art that the proximity switch or similar device that can be used in the technical solution of the present application may also be a photoelectric proximity switch, an eddy current proximity switch, and the like.

As shown in FIGS. 2 and 3 , according to an embodiment of the present application, a plurality of Hall sensors, such as three Hall sensors 250 a , 250 b , and 250 c , are provided in the housing 2210 of the host 220 . These Hall sensors are electrically connected to a central processing unit (ECU) for controlling the host 220 . For example, Hall sensors 250a, 250b, 250c may be arranged in interface 2211 of housing 2210. Preferably, the Hall sensors 250a, 250b, 250c can be hidden in the interface 2211, eg embedded in the housing 2210, so that the presence of these Hall sensors cannot be observed from the outside. The air filter box 230 is provided with a plurality of spaced alignment positions, and a plurality of magnetic elements can be selectively disposed at these alignment positions as required. For example, these alignment positions are located in the plane where the filter screen surface 2311 of the air filter box 230 is located, so that after the air filter box 230 is installed on the main unit 220 in place, these alignment positions can just be matched with the multiple Halls on the main unit 220. The sensors are aligned separately. For example, three alignment positions 260a, 260b, 260c are provided on the air filter box 230 .

Figures 2 and 3 show the layout of the Hall sensors 250a, 250b, 250c and the alignment positions 260a, 260b, 260c only in a schematic way, but it should be clear to those skilled in the art that the Hall sensors 250a, 250b, 250c also It can be more dispersedly arranged in the main unit 220 in the position that can be directly opposite to the air filter box 230 when it is correctly connected with the air filter box 230, and the alignment positions 260a, 260b, 260c on the air filter box 230 can also be correspondingly changed. layout.

First of all, the description will be given by taking an example that the three alignment positions 260a, 260b, and 260c of the air filter box 230 are all arranged with magnetic members. For example, each magnetic element may be a component made of permanent magnetic materials such as magnetic sheets and magnetic beads. Preferably, each magnetic element can also be hidden in the casing 2310 of the air filter box 230, for example, embedded in the casing 2310, so that the existence of these magnetic elements cannot be observed from the outside. When the host 220 is powered on, the ECU of the host 220 constantly monitors the states of the Hall sensors 250a, 250b, and 250c. In this way, when the air filter box 230 and the host 220 are installed in place, the magnetic elements at the alignment positions 260a, 260b, 260c are just aligned with the Hall sensors 250a, 250b, 250c adjacent to each other, so that the Hall sensors 250a, 250b , 250c generates a trigger signal. When the ECU of the host 220 determines that all hall sensors 250a, 250b, 250c have generated trigger signals, it is considered that the air filter box 230 and the host 220 have been installed in place, and the display screen 2214, (not shown in the figure) can beep and/or only at this time, the user can press the start button of the host 220 to make it work further.

It should be clear to those skilled in the art that, in order to ensure the monitoring of the installation position between the air filter box 230 and the host 220 , only one such magnetic element may be provided on the air filter box 230 to cooperate with a Hall sensor on the host 220 . Of course, if there are two or more magnetic parts arranged on the air filter box 230 and matched with the corresponding two or more Hall sensors on the host 220, the accuracy of the monitoring of the installation position can be further improved.

As an alternative and/or in addition, the following will take the selective arrangement of the Hall sensors 250a, 250b, 250c and the magnetic parts at the aligned positions 260a, 260b, 260c on the air filter box 230 as an example to introduce the method according to the present invention. How to apply the host 220 to automatically identify different types of air filter boxes.

5, it is assumed that three Hall sensors 250a, 250b, 250c are arranged on the host 220 for identifying the model of the air filter box 230 exclusively. In this application, different models of air filter boxes mean that the filter media inside the air filter boxes are arranged in different ways. There are three alignment positions 260a, 260b, 260c on the air filter box 230, but it is not necessary to provide a magnetic member at each alignment position. In this way, different combinations of magnetic element layouts can be produced on the air filter box 230 . For example, it is shown in FIG. 5 that 2 ³ -1=7 layouts can be generated on the air filter box 230 . Assuming that a Hall sensor can generate a "1" trigger signal when it detects the magnetic element that cooperates with it, and can generate a "0" trigger signal when it cannot monitor the magnetic element that cooperates with it, then the three Hall sensors can generate a "0" trigger signal. The trigger signal combinations generated at the same time by 250a, 250b and 250c are "100", "010", "001", "110", "101", "011" and "111" respectively. The manufacturer of the air filter box 230 can distinguish air filter boxes of different specifications according to the combination of these trigger signals. For example, for the first type of air filter box, the magnetics are placed only at the alignment position 260a; for the second type of air filter box, the magnetics are placed only at the alignment positions 260a and 260b; for the third type Type of air filter box, magnetic parts are arranged in all alignment positions 260a, 260b, 260c, so that when the Hall sensors 250a, 250b, 250c respectively monitor the trigger signal combination "100", "110", and "111" You can confirm that the type of air filter box is the first, the second and the third respectively.

That is, in order to determine the specifications of the air filter box, if there are N above-mentioned Hall sensors on the host 220 and there are N alignment positions in the air filter box, the magnetic member can be selectively arranged (wherein N is an integer greater than or equal to 2), then there may be a layout of 2 ^N −1 magnetic parts on the air filter box 230 , so as to distinguish the models of the air filter box 230 .

According to FIG. 6 , the following describes the control operation method of the electric breathing apparatus 100 according to an example of the present application. It should be clear to those skilled in the art that the example of the control method can be stored in the memory of the ECU as execution code, so that the ECU reads and controls the execution of the relevant components.

According to the present application, a plurality of Hall sensors are provided on the host 220, and a plurality of alignment positions are correspondingly set on the air filter box 230 at the positions where the air filter box 230 and the host 220 can be installed in place, wherein The plurality of Hall sensors can be divided into a first subgroup of Hall sensors for determining whether the air filter box 230 is installed in place with the host 220 ; and a second subgroup of Hall sensors for determining the model of the air filter box 230 . The first subset of Hall sensors may include one or more Hall sensors, and the second subset of Hall sensors may include N Hall sensors, where N is an integer greater than or equal to two. In this way, the multiple alignment positions of the air filter box 230 are also correspondingly divided into a first subgroup alignment position corresponding to the first subgroup of Hall sensors; and a second subgroup corresponding to the second subgroup of Hall sensors Align position.

For the air filter box 230, a magnetic member is arranged in each of the first subgroup of the alignment positions, and in the second subgroup of the alignment positions, depending on the model of the air filter box 230, similar to that shown in FIG. 5 Magnetic elements are selectively arranged in the manner shown. In addition, the memory of the host 220 stores in advance operation modes corresponding to the specifications of different air filter boxes (ie, the layout of the magnetic components at the aligned position of the second subset of the air filter boxes, such as the trigger signal combination in FIG. 5 ). library.

In step S10 , the air filter box 230 is mounted on the host 220 . In step S20, it is determined whether the first group of Hall sensors all monitor the corresponding magnetic element. If the corresponding magnetic parts are not detected, it is considered that the air filter box 230 is not installed on the host 220 in place, and the display 2214, a buzzer (not shown in the figure), or a vibrator and other prompting devices can be used to notify the The user issues a prompt to return to step S10 to reinstall the air filter box 230 . If in step S20, all the first Hall sensors have detected the corresponding magnetic element, then go to step S30. In step S30, the layout mode of the corresponding magnetic components monitored by the second group of Hall sensors, that is, the trigger signal combination corresponding thereto is determined. In step S40 , according to the layout mode of the magnetic element determined in step S30 , it is queried whether there is a corresponding layout mode in the operation mode library stored in advance, if so, go to step S50 , if not, go to step S60 . In step S50, the host 220 automatically corrects the operation mode matching the currently recognized model of the air filter box, and allows the user to further control the operation of the host 220. In step S60, a prompt device such as a display screen 2214, a buzzer (not shown in the figure), or a vibrator can be used to prompt the user that the current air filter box does not recognize the model, and a reminder to replace the air filter box Alternatively, the user is prohibited from further controlling the operation of the host 220 .

Similar to that shown above, a similar proximity switch design, such as a hall sensor and a magnetic design, can also be used between the connector 310 of the connecting hose 300 and the connecting port 210 of the air filter device 200 . As shown in FIG. 4 , an engaging structure 210 a is provided at the connection port 210 , and a matching structure 310 a for engaging with the engaging structure 210 a is also provided on the connector 310 . At the same time, one or more Hall sensors 210b are arranged at or near the joint structure 210a on the connection port 210. Correspondingly, one or more Hall sensors 210b are arranged at or near the matching structure 310a on the joint 310. Magnetics (similar to Fig. 2 the design can also be hidden). These magnetics are arranged to align with the Hall sensor 210 of the connection port 210 when the connector 310 is just in place with the connection port 210, thereby ensuring that the Hall sensor 210b can generate a trigger signal accordingly. In a similar manner to that described in FIG. 6 , it is determined whether the connector 310 is in place on the connection port 210 by monitoring the Hall sensors 210b to generate trigger signals for the corresponding magnetic elements.

Therefore, using the technical solution of the present application can not only ensure that the air filter box and the host, the connecting hose and the air filter device are installed in place, but also can automatically identify the model of the air filter box to reset the operation mode of the host, and improve the The reliability and convenience of use of the electric breathing apparatus of the present application.

Although specific embodiments of the present application are described in detail herein, they are presented for purposes of explanation only and should not be considered as limiting the scope of the present application. Furthermore, it should be apparent to those skilled in the art that the various embodiments described in this specification can be used in combination with each other. Various substitutions, changes and modifications may be devised without departing from the spirit and scope of the present application.

Claims (13)

1. An air filtration device (200) for a powered breathing apparatus (100), comprising:

a host (220) comprising a housing (2210) within which is disposed an electric fan (2220); and

an air-filter cassette (230) removably connectable to the host (220), the housing (2210) of the host (220) comprising an interface surface (2211) facing the air-filter cassette (230) when the host (220) is connected to the air-filter cassette (230), the air-filter cassette (230) having a housing (2310), the housing (2310) of the air-filter cassette (230) comprising a filter screen surface (2311) facing the host (220) when the host (220) is connected to the air-filter cassette (230), characterized in that the housing (2210) of the host (220) further comprises a first set of hall sensors in the interface surface (2211), the first set of hall sensors comprising N hall sensors spaced from each other, where N is an integer greater than or equal to 2, the housing (2310) of the air-filter cassette (230) further comprising N alignment positions in the filter screen surface (2211), the N alignment positions are aligned with the N hall sensors respectively when the air-filter cartridge (230) is coupled to the housing (2210) of the host computer (220), the air-filter cartridge (230) including one or N magnetic members selectively disposed at the N alignment positions, the arrangement of the magnetic members at the N alignment positions corresponding to the manner in which the host computer (220) operates with respect to the air-filter cartridge (230).

2. The air filtration device (200) of claim 1 wherein said magnetic member has 2 in said N registration positions^N1 arrangement.

3. The air filtration device (200) of claim 1 or 2, wherein the hall sensor is provided hidden in a housing (2210) of the host machine (220); and/or the magnetic member is concealed within a housing (2310) of the air-filter cassette (230).

4. The air filtration device (200) of claim 1 or 2, wherein the housing (2210) of the host machine (220) further comprises a second set of hall sensors in the interface (2211), the second set of hall sensors comprising at least one hall sensor, and wherein the housing (2310) of the air filter cassette (230) further comprises at least one additional alignment position in the screen face (2310), the at least one additional alignment position respectively aligning the hall sensors of the second set of hall sensors when the air filter cassette (230) is mounted in position with the host machine (220), one additional magnet being provided at each of the at least one additional alignment positions, respectively.

5. The air filtration device (200) of claim 4, wherein the housing (2210) of the host machine (220) includes a ring of first flanges (2212) around the interface (2211), and the housing (2310) of the air filter cassette (230) includes a ring of second flanges (2312) around the screen face (2311), the first flanges (2212) fully contacting the second flanges (2312) when the air filter cassette (230) is installed in place with the host machine (220).

6. The air filtration device (200) of claim 5, wherein the first and/or second set of Hall sensors are located within an area surrounded by the first flange (2212), and/or wherein the N alignment positions and/or the at least one additional alignment position are located within an area surrounded by the second flange (2312).

7. An air filtration device (200) according to claim 5, further comprising a connection port (210) for detachable connection to a fitting (310) of a connection hose (300) of the motorized breathing apparatus (100), the connection port (210) being configured with a third set of Hall sensors comprising at least one Hall sensor, the fitting (310) comprising at least one additional alignment position, the at least one additional alignment position of the fitting (310) being aligned with the Hall sensors of the third set of Hall sensors respectively when the fitting (310) is in place with the connection port (210), one additional magnet being provided at each of the at least one additional alignment positions of the fitting (310) respectively.

8. The air filtration device (200) of claim 7, wherein the magnetic member comprises magnetic beads or magnetic flakes made of a permanent magnetic material.

9. An air filtration device for a powered breathing apparatus (100), comprising:

a host (220) comprising a housing (2210) within which is disposed an electric fan (2220); and

an air-filter cassette (230) removably connectable to said host (220), said housing (2210) of said host (220) comprising an interface surface (2211) facing said air-filter cassette (230) when said host (220) is connected to said air-filter cassette (230), said air-filter cassette (230) having a housing (2310), said housing (2310) of said air-filter cassette (230) comprising a filter screen surface (2311) facing said host (220) when said host (220) is connected to said air-filter cassette (230), characterized in that said housing (2210) of said host (220) further comprises a first set of proximity switches located in said interface surface (2211), said first set of proximity switches comprising N proximity switches spaced apart from each other, wherein N is an integer greater than or equal to 2, said housing (2310) of said air-filter cassette (230) further comprising N aligned positions located in said filter screen surface (2311), the N alignment positions are respectively aligned with the N proximity switches when the air-filter cassette (230) is coupled to the housing (2210) of the host computer (220), the air-filter cassette (230) including one or N counterparts capable of interacting with the proximity switches selectively disposed at the N alignment positions, the counterparts in the N alignment positions being arranged in a manner corresponding to an operation manner of the host computer (220) with respect to the air-filter cassette (230).

10. A powered breathing apparatus (100), comprising:

an air filtration device according to any one of claims 1 to 9;

a respiratory mask (400); and

a connection hose (300) connected between the breathing mask (400) and the air filtering device.

11. A method of operating an air filtration device (200) according to any one of claims 1 to 9 comprising:

connecting the air filtration cassette (230) to a host machine (220);

on the premise that N aligning positions of the air filter box (230) are respectively aligned with N Hall sensors of a first group of Hall sensors of the host (220), wherein N is an integer greater than or equal to 2, and the N Hall sensors are used for monitoring the condition that magnetic parts exist at the N aligning positions;

comparing the monitoring result with a magnetic member distribution stored in advance to determine the model of the air filter box (230);

altering the manner of operation of the host (220) based on the model of the air filtration cassette (230).

12. The method of claim 11, wherein after connecting the air-filter cartridge (230) to the host computer (220) and prior to determining the model of the air-filter cartridge (230), monitoring whether a second set of hall sensors of the host computer (220) are aligned with additional magnets of the air-filter cartridge (230) in additional alignment positions to determine whether the air-filter cartridge (230) is in place on the host computer (220).

13. The operating method according to claim 12, characterized in that if the air-filter cartridge (230) is not mounted in place on the host machine (220), an alarm is issued and/or the operation of the host machine (220) is stopped.

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