Air filtering device for portable oxygen generator

Abstract

The invention provides an air filtering device for a portable oxygen generator, and relates to the technical field of air filtering, the air filtering device comprises an air filtering unit, a replacement feedback unit and a standby detection unit; two circular guide holes are formed in the air filtering shell, and two arc-shaped limiting grooves are formed in the inner wall of the air filtering shell; the number of the air filtering units is three, and the three air filtering units are installed on the air filtering shell. The multipurpose positioning unit is mounted on the air filtering shell; the replacement feedback unit is mounted on the air filtering shell and the multi-purpose positioning unit; the standby detection unit is mounted on the air filtering shell and the replacement feedback unit; the air filtering unit in the air filtering shell is used for filtering air, and the other two groups of air filtering units play a standby role, so that a user can replace the air filtering units outdoors; the problem that a user cannot replace an air filter screen outdoors due to the absence of a standby filtering function is solved.

Description

Technical Field

[0001] This invention belongs to the field of air filtration technology, and more specifically, relates to an air filtration device for a portable oxygen concentrator. Background Technology

[0002] Portable oxygen concentrators need to be equipped with air filters, mainly to effectively remove particulate matter and other impurities from the air before oxygen is separated. If the ambient air inhaled is not filtered, it will contaminate the molecular sieve and affect the oxygen production efficiency. It may also deliver particulate matter to the respiratory tract, increasing the risk of infection. As the first line of defense, the filter ensures the cleanliness and safety of oxygen, which is especially important for patients with chronic respiratory diseases.

[0003] The air filtration devices currently in use have the following problems: 1. They usually lack a replacement reminder structure, which means that the air filter cannot be automatically reminded to replace it after a long period of use, affecting the subsequent oxygen production effect; 2. They do not have a spare filter function, which means that users cannot replace the air filter outdoors, which also affects the oxygen production effect; 3. They cannot remind users to carry multiple air filters, which is not conducive to users' long-term outdoor use. Summary of the Invention

[0004] This disclosure relates to an air filtration device for a portable oxygen concentrator, comprising an air filtration unit, a multi-purpose positioning unit, a replacement feedback unit, and a backup detection unit. The air filtration unit inside the air filtration housing filters the air, while two additional air filtration units serve as backups, facilitating replacement by the user outdoors. When control switch a is pressed, buzzer a sounds, prompting the user to promptly replace the air filtration unit in the backup area with the one in the filtration area. It also prompts the user to set a mobile phone alarm for when they return home, allowing them to replenish the backup air filtration unit upon arrival. This solution addresses the problems of the air filter not automatically prompting the user to replace it after prolonged use, the user being unable to replace the air filter outdoors, and the inability to prompt the user to carry multiple air filters.

[0005] This invention provides an air filtration device for a portable oxygen concentrator, comprising: an air filter housing, air filter units, a multi-purpose positioning unit, a replacement feedback unit, and a spare detection unit; the air filter housing has two circular guide holes and two arc-shaped limiting grooves on its inner wall; the air filter units consist of three sets, all mounted on the air filter housing; the multi-purpose positioning unit is mounted on the air filter housing and is used to position the three sets of air filter units; the replacement feedback unit is mounted on the air filter housing and the multi-purpose positioning unit, and is used to detect whether the air filter units inside the air filter housing need to be replaced; the spare detection unit is mounted on the air filter housing and the replacement feedback unit, and is used to prompt the user to place a spare air filter unit in a timely manner.

[0006] In at least some embodiments, the air filtration unit includes: an air filter frame and an air filter screen; the air filter frame is slidably mounted on the air filter housing; the air filter screen has a single ring, and the single ring of air filter screen is fixedly mounted on the air filter frame.

[0007] In at least some embodiments, the air filter frame has an annular connecting groove inside and a rectangular replacement groove around its outer wall.

[0008] In at least some embodiments, the multi-purpose positioning unit includes: a T-shaped positioning seat, movable positioning blocks, and helical springs a; the T-shaped positioning seat is fixedly installed on the air filter housing and inserted into three air filter frames; there are a total of six movable positioning blocks, and the six movable positioning blocks are slidably installed on the T-shaped positioning seat; the four movable positioning blocks on the right side are inserted into two annular connecting grooves, and the two movable positioning blocks on the left side are in contact with the outer side of the air filter frame; there are a total of three helical springs a, and the three helical springs a are installed between the six movable positioning blocks.

[0009] In at least some embodiments, the multi-purpose positioning unit further includes: a circular mounting ring and a helical spring b; the circular mounting ring is fixedly mounted on a T-shaped positioning seat; the helical spring b is sleeved on the T-shaped positioning seat, and the right end of the helical spring b is fixedly connected to the circular mounting ring, and the left end of the helical spring b is in contact with the left side of the air filter frame.

[0010] In at least some embodiments, the replacement feedback unit includes: a lithium battery and a buzzer alarm a; the lithium battery is fixedly installed on the inner wall of the air filter housing; the buzzer alarm a is fixedly installed on the inner wall of the air filter housing.

[0011] In at least some embodiments, the replacement feedback unit further includes: a control switch a and a movable pressing shaft; the control switch a is installed inside the T-shaped positioning seat and is electrically connected to the lithium battery and the buzzer alarm a; when the control switch a is in the pressed state, the buzzer alarm a emits an alarm sound; the movable pressing shaft is slidably installed on the T-shaped positioning seat, and the inner end of the movable pressing shaft is in contact with the control switch a.

[0012] In at least some embodiments, the backup detection unit includes: a circular movable rod and a limiting force frame; there are two circular movable rods, and the two circular movable rods are slidably mounted on the air filter housing; there are two limiting force frames, and the two limiting force frames are fixedly mounted on the outside of the two circular movable rods.

[0013] In at least some embodiments, the backup detection unit further includes: a helical spring c and a circular guide rod; the helical spring c is sleeved on the outside of two circular movable rods and is located between two limiting force frames; there are two circular guide rods, and the two circular guide rods are fixedly installed on the two limiting force frames, and the outer ends of the two circular guide rods are inserted into two circular guide holes.

[0014] In at least some embodiments, the backup detection unit further includes: a buzzer alarm b and a control switch b; the buzzer alarm b is fixedly installed on the inner wall of the air filter housing; there are two control switches b, which are installed on two limit force brackets, and the two control switches b are electrically connected to the buzzer alarm b and the lithium battery; when the two control switches b are pressed at the same time, the buzzer alarm b emits an alarm sound.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. In this invention, the air filter unit inside the air filter housing filters the air, and the other two sets of air filter units serve as backups, which is beneficial for users to replace them outdoors; the setting of two annular connecting grooves and four movable positioning blocks on the right side provides an elastic positioning effect for the two air filter frames. In addition, the two movable positioning blocks on the left side enable the air filter frame inside the air filter housing to slide; the helical spring b provides elastic support for the air filter frame inside the air filter housing; when the air filter unit inside the air filter housing needs to be replaced, the resistance of the air passing through a ring of air filter increases, allowing the air filter frame to drive a ring of air filter to slide to the right.

[0016] 2. In this invention, when the air filter frame inside the air filter housing moves to a certain distance, the air filter frame can push the movable pressing axis to slide inward, so that the movable pressing axis automatically presses the control switch a; when the control switch a is in the pressing state, the buzzer alarm a emits an alarm sound, which can remind the user to replace the air filter unit in the spare area to the filter area in time.

[0017] 3. In this invention, when the air filter unit in the spare area is replaced in the filter area, the corresponding circular movable rod can slide outward a certain distance under the action of the helical spring c, so that the limiting force frame contacts the inner wall of the air filter housing; when both sets of air filter units in the spare area are removed, the two limiting force frames contact the inner wall of the air filter housing at the same time. In addition, when both control switches b are pressed at the same time, the buzzer b will sound an alarm, prompting the user to set a mobile phone alarm for when they get home, which is beneficial for the user to replenish the spare air filter unit after returning home; when the user has set the mobile phone alarm for when they get home, the user pushes one of the circular movable rods inward with their finger, so that the outer end of the circular guide rod separates from the circular guide hole, and then the user rotates the limit force frame to move the circular guide rod into the arc-shaped limit groove, thus deactivating the alarm sound. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0019] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0020] In the attached diagram: Figure 1 A three-dimensional structural schematic diagram of the present invention is shown; Figure 2 The present invention is shown. Figure 1 A schematic diagram of the structure from the right-side main viewpoint; Figure 3 The present invention is shown. Figure 1 A magnified schematic diagram of a portion of region A in the middle; Figure 4 A schematic diagram of the structure of the multi-purpose positioning unit of the present invention is shown; Figure 5 The present invention is shown. Figure 1 A schematic diagram of the central cross-section structure; Figure 6 The present invention is shown. Figure 5 A magnified schematic diagram of a portion of region B in the middle; Figure 7 The present invention is shown. Figure 5 A magnified schematic diagram of a portion of region C in the middle; Figure 8 The present invention is shown. Figure 1 A schematic diagram of the structure from the right side perspective; Figure 9 The present invention is shown. Figure 5 A magnified schematic diagram of a portion of region D in the middle; Figure 10 The present invention is shown. Figure 8 A magnified schematic diagram of the structure of region E in the middle.

[0021] List of reference numerals in the attached diagram: 100. Air filter housing; 101. Circular guide hole; 102. Arc-shaped limiting groove; 200. Air filter unit; 201. Air filter frame; 2011. Annular connecting groove; 2012. Rectangular replacement groove; 202. Air filter screen; 300. Multi-purpose positioning unit; 301. T-shaped positioning seat; 302. Movable positioning block; 303. Helical spring a; 304. Circular mounting ring; 305. Helical spring b; 400. Replace the feedback unit; 401. Lithium battery; 402. Buzzer alarm a; 403. Control switch a; 404. Movable push-button shaft; 500. Backup detection unit; 501. Circular movable rod; 502. Limiting force frame; 503. Helical spring c; 504. Circular guide rod; 505. Buzzer alarm b; 506. Control switch b. Detailed Implementation

[0022] To make the objectives, solutions, and advantages of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Unless otherwise stated, the terms used herein have their ordinary meanings in the art. The same reference numerals in the drawings represent the same parts.

[0023] Example: Please refer to Figures 1 to 10As shown: This invention provides an air filtration device for a portable oxygen concentrator, comprising: an air filter housing 100, an air filter unit 200, a multi-purpose positioning unit 300, a replacement feedback unit 400, and a backup detection unit 500; the air filter housing 100 has two circular guide holes 101, and the inner wall of the air filter housing 100 has two arc-shaped limiting grooves 102; three sets of air filter units 200 are provided, and the three sets of air filter units 200 are installed on the air filter housing 100; the multi-purpose positioning unit 300... The multi-purpose positioning unit 300 is installed on the air filter housing 100 and is used to position the three sets of air filter units 200. The replacement feedback unit 400 is installed on the air filter housing 100 and the multi-purpose positioning unit 300 and is used to detect whether the air filter unit 200 inside the air filter housing 100 needs to be replaced. The spare detection unit 500 is installed on the air filter housing 100 and the replacement feedback unit 400 and is used to remind the user to place the spare air filter unit 200 in a timely manner.

[0024] In this embodiment of the disclosure, such as Figure 3 , Figure 4 and Figure 6 As shown, the air filter unit 200 includes an air filter frame 201 and an air filter screen 202; the air filter frame 201 is slidably mounted on the air filter housing 100; the air filter screen 202 has a ring, and the ring of air filter screen 202 is fixedly mounted on the air filter frame 201; the air filter frame 201 has an annular connecting groove 2011 inside, and a rectangular replacement groove 2012 is formed on the outer wall of the air filter frame 201; The multi-purpose positioning unit 300 includes: a T-shaped positioning seat 301, movable positioning blocks 302, and a helical spring a303; the T-shaped positioning seat 301 is fixedly installed on the air filter housing 100, and the T-shaped positioning seat 301 is inserted into three air filter frames 201; there are six movable positioning blocks 302 in total, and the six movable positioning blocks 302 are slidably installed on the T-shaped positioning seat 301; the four movable positioning blocks 302 on the right are inserted into two annular connecting grooves 2011, and the two movable positioning blocks 302 on the left are connected to the air filter frames 201. The outer side of 01 is in contact; there are three helical springs a303, and the three helical springs a303 are installed between the six movable positioning blocks 302; the multi-purpose positioning unit 300 also includes: a circular mounting ring 304 and a helical spring b305; the circular mounting ring 304 is fixedly installed on the T-shaped positioning seat 301; the helical spring b305 is sleeved on the T-shaped positioning seat 301, and the right end of the helical spring b305 is fixedly connected to the circular mounting ring 304, and the left end of the helical spring b305 is in contact with the left side air filter frame 201; Its specific function is as follows: because the three air filter frames 201 are slidably installed on the air filter housing 100, and the T-shaped positioning seat 301 is inserted into the three air filter frames 201, the air filter unit 200 inside the air filter housing 100 filters the air, and the other two sets of air filter units 200 serve as backups, which is convenient for users to replace outdoors; and because the interior of the three air filter frames 201 is provided with annular connecting grooves 2011, and the four movable positioning blocks 302 on the right side are inserted into the two annular connecting grooves 2011, the two air filter frames 201 are elastically positioned. Furthermore, because the two movable positioning blocks 302 on the left side are in contact with the outer side of the air filter frame 201, the air filter frame 201 inside the air filter housing 100 has a sliding effect; and because the circular mounting ring 304 is fixedly mounted on the T-shaped positioning seat 301, and the right end of the coil spring b305 is fixedly connected to the circular mounting ring 304, and the left end of the coil spring b305 is in contact with the left side of the air filter frame 201, it provides elastic support for the air filter frame 201 inside the air filter housing 100; when the air filter unit 200 inside the air filter housing 100 needs to be replaced, the resistance of the air passing through the air filter screen 202 increases, which allows the air filter frame 201 to drive the air filter screen 202 to slide to the right.

[0025] In this embodiment of the disclosure, such as Figure 5 and Figure 7 As shown, the replacement feedback unit 400 includes: a lithium battery 401 and a buzzer alarm a402; the lithium battery 401 is fixedly installed on the inner wall of the air filter housing 100; the buzzer alarm a402 is fixedly installed on the inner wall of the air filter housing 100; the replacement feedback unit 400 also includes: a control switch a403 and a movable pressing shaft 404; the control switch a403 is installed inside the T-shaped positioning seat 301, and the control switch a403 is electrically connected to the lithium battery 401 and the buzzer alarm a402; when the control switch a403 is in the pressed state, the buzzer alarm a402 emits an alarm sound; the movable pressing shaft 404 is slidably installed on the T-shaped positioning seat 301, and the inner end of the movable pressing shaft 404 is in contact with the control switch a403; Its specific function is as follows: Since the control switch a403 is installed inside the T-shaped positioning seat 301, and the movable pressing shaft 404 is slidably installed on the T-shaped positioning seat 301, and the inner end of the movable pressing shaft 404 is in contact with the control switch a403, when the air filter frame 201 inside the air filter housing 100 moves to a certain distance, the air filter frame 201 can push the movable pressing shaft 404 to slide inward, so that the movable pressing shaft 404 automatically presses the control switch a403; since the lithium battery 401 is fixedly installed on the inner wall of the air filter housing 100, and the buzzer alarm a402 is fixedly installed on the inner wall of the air filter housing 100, when the control switch a403 is in the pressed state, the buzzer alarm a402 emits an alarm sound, which can remind the user to replace the air filter unit 200 in the spare area to the filter area in time.

[0026] In this embodiment of the disclosure, such as Figure 5 , Figure 9 and Figure 10 As shown, the backup detection unit 500 includes: two circular movable rods 501 and two limiting force-bearing frames 502; two circular movable rods 501 are provided, and the two circular movable rods 501 are slidably mounted on the air filter housing 100; two limiting force-bearing frames 502 are provided, and the two limiting force-bearing frames 502 are fixedly mounted on the outside of the two circular movable rods 501; the backup detection unit 500 also includes: a helical spring c503 and a circular guide rod 504; the helical spring c503 is sleeved on the outside of the two circular movable rods 501, and the helical spring c503 is located between the two limiting force-bearing frames 502; two circular guide rods 504 are provided, and the two circular guide rods 504 are fixedly mounted on the outside of the two circular movable rods 501. Rod 504 is fixedly installed on two limiting force-bearing frames 502, and the outer ends of the two circular guide rods 504 are inserted into two circular guide holes 101; the backup detection unit 500 also includes: a buzzer alarm b505 and a control switch b506; the buzzer alarm b505 is fixedly installed on the inner wall of the air filter housing 100; there are two control switches b506, and the two control switches b506 are installed on the two limiting force-bearing frames 502, and the two control switches b506 are electrically connected to the buzzer alarm b505 and the lithium battery 401; when the two control switches b506 are pressed at the same time, the buzzer alarm b505 sounds an alarm. Its specific function is as follows: Since the two circular movable rods 501 are slidably installed on the air filter housing 100, and the two limiting force brackets 502 are fixedly installed on the outside of the two circular movable rods 501, and the helical spring c503 is located between the two limiting force brackets 502, when the air filter unit 200 in the spare area is replaced to the filter area, the corresponding circular movable rod 501 can slide outward a certain distance under the action of the helical spring c503, so that the limiting force bracket 502 contacts the inner wall of the air filter housing 100; and since the two control switches b506 are installed on the two limiting force brackets 502, when both sets of air filter units 200 in the spare area are removed, the two limiting force brackets 502 simultaneously contact the inner wall of the air filter housing 100. Furthermore, since the buzzer alarm b505 is fixedly installed on the inner wall of the air filter housing 100, and the two control switches b506 are installed on the two limit force brackets 502, when the two control switches b506 are pressed at the same time, the buzzer alarm b505 will sound an alarm, prompting the user to set a mobile phone alarm for when they get home, which is beneficial for the user to replenish the spare air filter unit 200 after returning home. Also, since the inner wall of the air filter housing 100 has two arc-shaped limit grooves 102, and the two circular guide rods 504 are fixedly installed on the two limit force brackets 502, and the outer ends of the two circular guide rods 504 are inserted into the two circular guide holes 101, when the user sets the mobile phone alarm for when they get home, the user pushes one of the circular movable rods 501 inward with their finger, so that the outer end of the circular guide rod 504 is separated from the circular guide hole 101. Then the user rotates the limit force bracket 502, so that the circular guide rod 504 moves into the arc-shaped limit groove 102, thereby deactivating the alarm sound.

[0027] The specific usage and function of this embodiment are as follows: In use, the air filter housing 100 is first connected to the air intake pipe of the portable oxygen concentrator. The air filter unit 200 inside the air filter housing 100 filters the air, while two other sets of air filter units 200 serve as backups, facilitating replacement outdoors. When the air filter unit 200 inside the air filter housing 100 needs replacement, the resistance as air passes through the air filter mesh 202 increases, causing the air filter frame 201 to slide the air filter mesh 202 to the right. When the air filter frame 201 inside the air filter housing 100 moves a certain distance, it pushes the movable pressing shaft 404 to slide inward, causing the movable pressing shaft 404 to automatically press the control switch a403. When the control switch a403 is pressed, the buzzer alarm a402 sounds, prompting the user to promptly replace the air filter unit 200 in the backup area with the one in the filter area. When the air filter unit 200 needs to be replaced, the air filter housing 100 is separated from the air intake pipe of the portable oxygen concentrator. Then, one of the spare air filter units 200 is installed in the filter position. When the spare air filter unit 200 is taken out, the user inserts two fingers into the two rectangular replacement slots 2012 and then pulls the air filter frame 201 outward. When the air filter unit 200 in the spare area is replaced in the filter area, the corresponding circular movable rod 501 can slide outward a certain distance under the action of the coil spring c503, so that the limiting force frame 502 contacts the inner wall of the air filter housing 100. Then, the air filter housing 100 is reconnected to the air intake pipe of the portable oxygen concentrator. When both sets of air filter units 200 in the spare area are removed, the two limiting force brackets 502 simultaneously contact the inner wall of the air filter housing 100; when both control switches b506 are pressed simultaneously, the buzzer alarm b505 sounds an alarm, prompting the user to set a mobile phone alarm for when they get home, which is beneficial for the user to replenish the spare air filter unit 200 after returning home; when the user sets the mobile phone alarm for when they get home, the user pushes one of the circular movable rods 501 inward with their finger, causing the outer end of the circular guide rod 504 to separate from the circular guide hole 101, and then the user rotates the limiting force bracket 502, causing the circular guide rod 504 to move into the arc-shaped limiting groove 102, thus deactivating the alarm sound; When replacing the two spare air filter units 200, reset the corresponding circular guide rods 504 so that the outer end of the circular guide rods 504 is connected to the circular guide hole 101, and then install the two new air filter units 200 in the spare area.

[0028] The following points should be noted in this article: 1. The accompanying drawings of the embodiments disclosed herein only relate to the structures involved in the embodiments disclosed herein; other structures can be referred to in general design.

[0029] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0030] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. An air filtration device for a portable oxygen concentrator, comprising: The system comprises an air filter housing (100), an air filter unit (200), a multi-purpose positioning unit (300), a replacement feedback unit (400), and a backup detection unit (500). The air filter housing (100) has two circular guide holes (101) and two arc-shaped limiting grooves (102) on its inner wall. The system is characterized in that three sets of air filter units (200) are provided, and these three sets of air filter units (200) are mounted on the air filter housing (100). The multi-purpose positioning unit (300) is mounted on the air filter housing (100). The multi-purpose positioning unit (300) is used to position three sets of air filter units (200); the replacement feedback unit (400) is installed on the air filter housing (100) and the multi-purpose positioning unit (300), and the replacement feedback unit (400) is used to detect whether the air filter unit (200) inside the air filter housing (100) needs to be replaced; the spare detection unit (500) is installed on the air filter housing (100) and the replacement feedback unit (400), and the spare detection unit (500) is used to prompt the user to place the spare air filter unit (200) in a timely manner.

2. An air filtration device for a portable oxygen concentrator according to claim 1, characterized in that, The air filter unit (200) includes an air filter frame (201) and an air filter screen (202); the air filter frame (201) is slidably mounted on the air filter housing (100); the air filter screen (202) has a ring, and the ring of air filter screen (202) is fixedly mounted on the air filter frame (201).

3. An air filtration device for a portable oxygen concentrator according to claim 2, characterized in that, The air filter frame (201) has an annular connecting groove (2011) inside, and a rectangular replacement groove (2012) is formed on the outer wall of the air filter frame (201).

4. An air filtration device for a portable oxygen concentrator according to claim 3, characterized in that, The multi-purpose positioning unit (300) includes: a T-shaped positioning seat (301), a movable positioning block (302), and a helical spring a (303); the T-shaped positioning seat (301) is fixedly installed on the air filter housing (100), and the T-shaped positioning seat (301) is inserted into three air filter frames (201); there are a total of six movable positioning blocks (302), and the six movable positioning blocks (302) are slidably installed on the T-shaped positioning seat (301); the four movable positioning blocks (302) on the right side are inserted into two annular connecting grooves (2011), and the two movable positioning blocks (302) on the left side are in contact with the outer side of the air filter frame (201); there are a total of three helical springs a (303), and the three helical springs a (303) are installed between the six movable positioning blocks (302).

5. An air filtration device for a portable oxygen concentrator according to claim 4, characterized in that, The multi-purpose positioning unit (300) further includes: a circular mounting ring (304) and a helical spring b (305); the circular mounting ring (304) is fixedly mounted on the T-shaped positioning seat (301); the helical spring b (305) is sleeved on the T-shaped positioning seat (301), and the right end of the helical spring b (305) is fixedly connected to the circular mounting ring (304), and the left end of the helical spring b (305) is in contact with the left side air filter frame (201).

6. An air filtration device for a portable oxygen concentrator according to claim 4, characterized in that, The replacement feedback unit (400) includes a lithium battery (401) and a buzzer alarm a (402); the lithium battery (401) is fixedly installed on the inner wall of the air filter housing (100); the buzzer alarm a (402) is fixedly installed on the inner wall of the air filter housing (100).

7. An air filtration device for a portable oxygen concentrator according to claim 6, characterized in that, The replacement feedback unit (400) further includes: a control switch a (403) and a movable pressing shaft (404); the control switch a (403) is installed inside the T-shaped positioning seat (301), and the control switch a (403) is electrically connected to the lithium battery (401) and the buzzer alarm a (402). When the control switch a (403) is in the pressed state, the buzzer alarm a (402) emits an alarm sound; the movable pressing shaft (404) is slidably installed on the T-shaped positioning seat (301), and the inner end of the movable pressing shaft (404) is in contact with the control switch a (403).

8. An air filtration device for a portable oxygen concentrator according to claim 6, characterized in that, The backup detection unit (500) includes: a circular movable rod (501) and a limiting force frame (502); there are two circular movable rods (501), and the two circular movable rods (501) are slidably installed on the air filter housing (100); there are two limiting force frames (502), and the two limiting force frames (502) are fixedly installed on the outside of the two circular movable rods (501).

9. An air filtration device for a portable oxygen concentrator according to claim 8, characterized in that, The backup detection unit (500) further includes: a helical spring c (503) and a circular guide rod (504); the helical spring c (503) is sleeved on the outside of the two circular movable rods (501), and the helical spring c (503) is located between the two limiting force frames (502); there are two circular guide rods (504), and the two circular guide rods (504) are fixedly installed on the two limiting force frames (502), and the outer ends of the two circular guide rods (504) are inserted into two circular guide holes (101).

10. An air filtration device for a portable oxygen concentrator according to claim 9, characterized in that, The backup detection unit (500) further includes: a buzzer alarm b (505) and a control switch b (506); the buzzer alarm b (505) is fixedly installed on the inner wall of the air filter housing (100); there are two control switches b (506), and the two control switches b (506) are installed on two limit force brackets (502), and the two control switches b (506) are electrically connected to the buzzer alarm b (505) and the lithium battery (401); when the two control switches b (506) are pressed at the same time, the buzzer alarm b (505) emits an alarm sound.

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