Air filtering device for medical oxygen generator

Abstract

The invention discloses an air filtering device for a medical oxygen generator, the air filtering device comprises a primary filter cartridge, a plurality of secondary filter cartridges uniformly distributed in the primary filter cartridge along the circumference, a shell, a top cover and a base, the filter cartridges are detachably mounted at the bottom of the top cover, and a gas channel for communicating outlets of the secondary filter cartridges with an exhaust port is arranged in the top cover. A cage-shaped rotating body type cleaning mechanism I is arranged on the outer side of the first-stage filter cartridge and is driven to rotate by airflow of an air inlet in the tangential direction of a shell, and the outer wall of the filter cartridge is cleaned by a cleaning brush; a cleaning mechanism II comprising an L-shaped rotating arm and a sealing bowl is arranged on the inner side, and the single secondary filter cartridge is reversely purged by virtue of high-pressure return air of the compressor of the oxygenerator. The cleaning mechanism I does not need extra power, and when the cleaning mechanism II is used for cleaning, other filter cartridges can work normally, so that non-stop online cleaning is realized. The device solves the problems that the existing filter material is easy to block and short in service life, prolongs the replacement period of the filter material, reduces the cost, ensures the continuous operation of the oxygenerator, and is wide in adaptability, energy-saving and efficient.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of oxygen generators, in particular to an air filtering device for a medical oxygen generator. BACKGROUND

[0002] A medical molecular sieve oxygen generator is a medical device based on pressure swing adsorption technology, which uses air as raw material and separates oxygen with a purity of greater than or equal to 90% through the selective adsorption characteristics of molecular sieves for nitrogen and oxygen, and is widely used in hospital wards, home oxygen therapy, community medical treatment and other scenes.

[0003] In order to protect the service life of the core components (such as compressors and molecular sieves) of the oxygen generator and ensure that the cleanliness of the output oxygen meets the medical standards, an air filtering mechanism is usually configured inside the oxygen generator. However, the air filtering device in the prior art usually uses multiple filter cartridges or filter plates with different filtering accuracies. Such filter materials have the defect of short service life and generally need to be replaced after 1-3 months. Frequent replacement of filter materials not only is cumbersome to operate and increases the use cost, but also causes the oxygen generator to be forced to stop, affecting the stable play of its continuous oxygen supply function, and is difficult to meet the use demand of high efficiency and continuous operation of the oxygen generating equipment in the medical scene. SUMMARY

[0004] The purpose of the present application is to overcome the above technical problems and provide an air filtering device for a medical oxygen generator.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is as follows: an air filtering device for a medical oxygen generator, comprising a primary filter cartridge, a secondary filter cartridge, a shell, a top cover and a base, characterized in that: a plurality of secondary filter cartridges are uniformly arranged in the primary filter cartridge in the circumferential direction, the primary filter cartridge and the secondary filter cartridge are detachably installed at the bottom of the top cover, an exhaust port is arranged on the side wall of the top cover, a gas passage is arranged in the top cover, and the outlet of the secondary filter cartridge and the exhaust port are in communication with the gas passage. A cleaning mechanism one is arranged on the outside of the primary filter cartridge, and a cleaning mechanism two is arranged on the inside of the primary filter cartridge. The cleaning mechanism one is a cage-shaped rotating body, which comprises two fixed rings arranged oppositely and a plurality of spiral rib plates connected between the two fixed rings, the fixed rings are rotatably connected with the inner wall of the shell through sealing bearings, the inside of the spiral rib plate is provided with a cleaning brush, and the cleaning brush is in close contact with the outer wall of the primary filter cartridge, the upper end of the shell is provided with an air inlet, and the air inlet is arranged in the tangential direction of the shell, so that the entering gas impacts the spiral rib plate to drive the cage-shaped rotating body to rotate. The cleaning mechanism two comprises an L-shaped rotating arm and a sealing bowl, the sealing bowl is fixedly arranged at the end of the horizontal section of the L-shaped rotating arm, the L-shaped rotating arm is a hollow structure, the top of the L-shaped rotating arm is connected with a gas return pipe through a rotating pipe joint, the other end of the gas return pipe is communicated with the gas outlet of the compressor of the medical oxygen generator, an electromagnetic valve is arranged on the gas return pipe for controlling the on-off; The top of the vertical section of the L-shaped rotating arm penetrates the top cover and is rotationally connected with the top cover, a rotating sealing sheet is arranged on the vertical section of the L-shaped rotating arm, the rotating sealing sheet is located in the gas channel and is in close contact with the bottom wall of the gas channel, the rotating sealing sheet rotates synchronously with the L-shaped rotating arm, so that the sealing bowl and the rotating sealing sheet can cover the upper and lower ends of the same secondary filter cartridge at the same time.

[0006] Further, the bottom of the shell is provided with a support plate, the support plate comprises a ring body arranged horizontally and a cone body connected to the inner side of the ring body, the cage-shaped rotating body and the primary filter cartridge are located above the ring body, and the secondary filter cartridge is arranged above the cone body.

[0007] Further, the spiral rib plates are uniformly distributed along the circumferential direction of the fixed ring, a gap between adjacent two spiral rib plates is provided with a notch on the lower fixed ring, a plurality of dust discharging ports are arranged on the ring body, when the notch is aligned with the dust discharging port, the dust cleaned by the cleaning mechanism one can fall into the dust discharging port, the bottom of the dust discharging port is provided with a first dust discharging pipe, the ends of a plurality of first dust discharging pipes are gathered together, and the bottom is connected with a dust collecting box. The base is detachably connected with the bottom of the shell, and the dust collecting box extends into the base, the dust collecting box is of an upper and lower split structure, and the upper and lower parts are connected through threads.

[0008] Further, the bottom of the cone body is provided with a second dust discharging pipe, the bottom end of the second dust discharging pipe is gathered together with the first dust discharging pipe, and a dust discharging valve is arranged above the dust collecting box.

[0009] Further, the outer side of the secondary filter cartridge is provided with a cage-shaped cover, the secondary filter cartridge is mounted and connected with the top cover through the cage-shaped cover, a plurality of bowl buckles are arranged on the cage-shaped cover in the up-down direction, and the opening direction of the bowl buckle is downward, the bottom of the cage-shaped cover is provided with a one-way valve, and the conduction direction of the one-way valve is from outside to inside. The bottom end of the cage-shaped cover is detachable, so as to replace the secondary filter cartridge.

[0010] Furthermore, the one-way valve includes a bracket, a frustum-shaped plug, a spring, and a sliding rod. The bottom plate of the cage-shaped outer cover is provided with a frustum-shaped through hole. The frustum-shaped plug cooperates with the frustum-shaped through hole to achieve a seal. The larger diameter end of the frustum-shaped plug is set upwards. The sliding rod is fixedly set on the top of the frustum-shaped plug and is slidably connected to the bracket through the sliding rod. A spring is sleeved on the outside of the sliding rod, and the two ends of the spring are fixedly connected to the frustum-shaped plug and the bracket, respectively.

[0011] Furthermore, the vertical part of the L-shaped rotating arm is divided into an upper section and a lower section. The upper section is connected to the top cover, and the lower section is slidably sleeved with the bottom end of the upper section and the two rotate synchronously. An electromagnet is provided at the bottom of the top cover, and a magnetic ring is fixedly connected to the side wall of the lower section. When the electromagnet is energized, it attracts the magnetic ring, which can drive the lower section to rise.

[0012] Furthermore, the outer wall of the upper section is provided with multiple limiting protrusions, and the inner wall of the lower section is provided with corresponding limiting grooves. The limiting protrusions are slidably disposed within the limiting grooves, and both ends of the limiting grooves are sealed. The bottom of the top cover is provided with a sealing ring corresponding to the top wall of the lower section to achieve a seal.

[0013] Furthermore, it also includes a drive mechanism, which includes a drive motor and a bevel gear set. The bevel gear set includes two meshing bevel gears, which are respectively fixedly mounted on the upper section of the L-shaped rotating arm and the output shaft of the drive motor.

[0014] Furthermore, the rotating sealing sheet is provided with multiple vent holes, the number of which is twice the number of the secondary filter cartridges, and one of the vent holes is in a blocked state.

[0015] The beneficial effects of the present invention are as follows: The device of the present invention performs online cleaning of the primary filter cartridge and the secondary filter cartridge through cleaning mechanism one and cleaning mechanism two respectively. It can remove dust and impurities attached to the surface of the filter media without stopping the machine, effectively solving the problems of easy clogging of filter media and short service life (1-3 months) in existing filter devices. It significantly extends the replacement cycle of the primary and secondary filter cartridges, reduces the frequency of filter media replacement, and reduces the cost of filter media procurement and labor maintenance.

[0016] The cleaning process does not require disassembling the filter media. Cleaning mechanism one rotates automatically using the impact force of air entering tangentially from the air inlet, while cleaning mechanism two drives an L-shaped rotating arm to rotate, aligning the sealing bowl with the bottom of one of the secondary filter cartridges. High-pressure gas generated by the oxygen concentrator's internal compressor is then introduced into the secondary filter cartridge for backflushing, thus cleaning it. While one secondary filter cartridge is being cleaned, the other two can continue operating, achieving uninterrupted cleaning and avoiding the oxygen concentrator shutdown problem caused by frequent filter media replacements in existing technologies. This meets the continuous operation requirements of oxygen concentrators in medical settings.

[0017] The spiral ribs of the cleaning mechanism not only bear the air entering through the inlet, but their spiral structure also guides the air to move from top to bottom along the side wall, ensuring that the primary filter cartridge receives air evenly. As the air moves along the spiral ribs, it blows the cleaned dust to the bottom of the cage-shaped rotating body, facilitating dust removal.

[0018] The first cleaning mechanism uses the kinetic energy of the intake airflow to drive rotation, requiring no additional power source and saving energy. The second cleaning mechanism uses the return air from the oxygen concentrator's own compressor for reverse purging, requiring no additional dedicated air source. It has a compact structure, is compatible with different models of medical oxygen concentrators, and has a wide range of applications. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an air filtration device for a medical oxygen concentrator according to the present invention; Figure 2 This is a schematic diagram of the housing in a transparent state of an air filtration device for a medical oxygen concentrator according to the present invention; Figure 3 This is a schematic diagram of the housing and top cover of an air filtration device for a medical oxygen concentrator under a perspective view, according to the present invention. Figure 4 This is an exploded view of an air filtration device for a medical oxygen concentrator according to the present invention; Figure 5 yes Figure 4 Enlarged view of section A; Figure 6 This is a schematic diagram of the structure of a cage-shaped outer cover for an air filtration device for a medical oxygen generator according to the present invention; Figure 7 This is a schematic diagram of the longitudinal section of the cage-shaped outer cover and the secondary filter cartridge of an air filtration device for a medical oxygen concentrator according to the present invention. Figure 8 yes Figure 7 Enlarged view of section B; Figure 9 This is an exploded view of the second cleaning mechanism of an air filtration device for a medical oxygen concentrator according to the present invention; Figure 10 This is a schematic diagram of the cleaning mechanism of an air filtration device for a medical oxygen concentrator according to the present invention; Figure 11 This is a schematic diagram of the structure of a support plate for an air filtration device for a medical oxygen concentrator according to the present invention; Figure 12 This is a schematic diagram of the drive mechanism of an air filtration device for a medical oxygen generator according to the present invention.

[0020] 1. Primary filter cartridge; 2. Secondary filter cartridge; 3. Housing; 31. Air inlet; 4. Top cover; 41. Exhaust port; 42. Gas passage; 5. Base; 6. Cleaning mechanism one; 61. Fixing ring; 611. Notch; 62. Spiral rib; 63. Cleaning brush; 7. Cleaning mechanism two; 71. L-shaped rotating arm; 711. Upper section; 7111. Limiting protrusion; 712. Lower section; 7121. Limiting groove; 72. Sealing bowl; 73. Rotating sealing plate; 731. Vent hole; 8. Sealed bearing; 9. Rotating pipe connection 10. Head; 11. Return air duct; 12. Support plate; 13. Ring body; 14. Ash discharge port; 15. Cone body; 16. First ash discharge pipe; 17. Ash collection box; 18. Second ash discharge pipe; 19. Ash discharge valve; 10. Cage-shaped outer cover; 10. Inverted bowl; 11. Frustum-shaped through hole; 12. One-way valve; 13. Bracket; 14. Frustum-shaped sealing component; 15. Spring; 16. Sliding rod; 17. Electromagnet; 18. Magnetic ring; 19. Drive mechanism; 20. Drive motor; 202. Bevel gear set. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0022] Embodiments of the present invention: such as Figures 1-3 As shown, an air filtration device for a medical oxygen concentrator includes a primary filter cartridge 1, a secondary filter cartridge 2, a housing 3, a top cover 4, and a base 5. The top side wall of the housing 3 is provided with an air inlet 31, and the side wall of the top cover 4 is provided with an exhaust port 41. The primary filter cartridge 1 and the secondary filter cartridge 2 are detachably installed at the bottom of the top cover 4. There are multiple secondary filter cartridges 2, which are evenly distributed in the circumferential direction inside the primary filter cartridge 1. The top cover 4 is provided with a gas channel 42, and the outlet and exhaust port 41 at the top of the secondary filter cartridge 2 are connected to the gas channel 42.

[0023] It is worth noting that the top of the housing 3 is detachably connected to the top cover 4, which is achieved by threaded connection or by setting a latch in the circumferential direction to achieve a sealed connection.

[0024] With the above structure, outside air enters the housing 3 through the air inlet 31, is filtered by the primary filter cartridge 1, enters the interior of the primary filter cartridge 1, enters the interior of the secondary filter cartridge 2, and then moves upward into the gas channel 42. The air in the multiple secondary filter cartridges 2 gathers in the gas channel 42 and is then discharged through the exhaust port 41.

[0025] like Figure 4As shown, the outer side of the primary filter cartridge 1 is provided with a cleaning mechanism 6, and the inner side is provided with a cleaning mechanism 7. like Figure 10 As shown, the cleaning mechanism 6 is a cage-shaped rotating body. The cage-shaped rotating body includes two fixed rings 61 arranged opposite each other and multiple spiral ribs 62 connected between the two fixed rings 61. The fixed rings 61 are rotatably connected to the inner wall of the housing 3 through a sealed bearing 8. The inner side of the spiral ribs 62 is provided with a cleaning brush 63, and the cleaning brush 63 is in close contact with the outer wall of the first-stage filter cartridge 1. The upper end of the housing 3 is provided with an air inlet 31, and the air inlet 31 is arranged along the tangential direction of the housing 3, so that the incoming gas impacts the spiral ribs 62 to drive the cage-shaped rotating body to rotate.

[0026] It is worth noting that the air inlet 31 is connected to an induced draft fan, which draws air in.

[0027] With the above structure, outside air enters from the air inlet 31 and impacts the spiral rib 62, thereby driving the cage-shaped rotating body to rotate, so that the cleaning brush 63 cleans the primary filter cartridge 1. At the same time, the gas moves downward along the spiral rib 62, carrying the cleaned dust downward to the bottom of the cage-shaped rotating body.

[0028] like Figure 9 As shown, the cleaning mechanism 7 includes an L-shaped rotating arm 71 and a sealing bowl 72. The sealing bowl 72 is fixedly installed at the end of the horizontal section of the L-shaped rotating arm 71. The L-shaped rotating arm 71 has a hollow structure, and its top is connected to a return air conduit 10 through a rotating pipe joint 9. The other end of the return air conduit 10 is connected to the air outlet of the compressor in the medical oxygen concentrator.

[0029] It is worth noting that a solenoid valve is provided on the return gas duct 10 to control the entry of high-pressure gas. The return gas duct 10 is a rigid pipe, and a support frame is provided inside the oxygen generator or on the side wall of the filter device corresponding to the return gas duct 10 to fix the return gas duct 10, so that the L-shaped rotating arm 71 can rotate relative to the return gas duct 10.

[0030] With the above structure, the L-shaped rotating arm 71 drives the sealing bowl 72 to rotate to the bottom of a secondary filter cartridge 2. The high-pressure air discharged by the compressor back-blowing cleans the secondary filter cartridge 2, and the blown-out dust gradually falls and accumulates.

[0031] like Figure 3 As shown, the top of the vertical section of the L-shaped rotating arm 71 passes through the top cover 4 and is rotatably connected to the top cover 4. A rotating sealing plate 73 is provided on the vertical section of the L-shaped rotating arm 71, and the rotating sealing plate 73 is located in the gas channel 42 and contacts the bottom wall of the gas channel 42. The rotating sealing plate 73 rotates synchronously with the L-shaped rotating arm 71, so that the sealing bowl 72 and the rotating sealing plate 73 can simultaneously cover the upper and lower ends of the same secondary filter cartridge 2.

[0032] With the above structure, when the L-shaped rotating arm 71 rotates, the rotating sealing plate 73 rotates synchronously. When the bottom sealing bowl 72 is aligned with one of the secondary filter cartridges 2, the rotating sealing plate 73 simultaneously seals the top of the secondary filter cartridge 2, so that the high-pressure gas can only move from the inside to the outside of the secondary filter cartridge 2, thereby backflushing the secondary filter cartridge 2.

[0033] like Figure 2 , 3 As shown in Figures 4 and 11, the bottom of the housing 3 is provided with a support plate 11. The support plate 11 includes a horizontally arranged ring 111 and a cone 112 connected to the inner side of the ring 111. The cage-shaped rotating body and the primary filter cartridge 1 are both located above the ring 111, and the secondary filter cartridge 2 is located above the cone 112.

[0034] like Figure 10 , 11 As shown, the spiral ribs 62 are evenly distributed along the circumference of the fixing ring 61. The lower fixing ring 61 has notches 611 corresponding to the gaps between adjacent spiral ribs 62. The ring body 111 has multiple ash discharge ports 1111. When the notches 611 and ash discharge ports 1111 are aligned, the dust cleaned by the cleaning mechanism 6 can fall into the ash discharge ports 1111. The bottom of the ash discharge ports 1111 has a first ash discharge pipe 12. The ends of multiple first ash discharge pipes 12 converge together, and the bottom is connected to an ash collection box 13. The base 5 is detachably connected to the bottom of the housing 3, and the ash collection box 13 extends into the base 5. The ash collection box 13 has a split upper and lower structure, with the upper and lower parts connected by threads.

[0035] With the above structure, as the cage-shaped rotating body rotates, dust gradually accumulates at its bottom. As the lower fixing ring 61 rotates, the dust falls into the notch 611 and aligns with the ash discharge port 1111 in sequence, so that the dust in the notch falls into the ash discharge port 1111 and enters the ash collection box 13 along the first ash discharge pipe 12 for collection. When the filter material is replaced, the dust in the ash collection box 13 can be opened and cleaned.

[0036] like Figure 11 As shown, the bottom of the cone 112 is provided with a second row of ash pipes 14, the bottom end of the second row of ash pipes 14 and the first row of ash pipes 12 converge together, and the top of the ash collection box 13 is provided with an ash discharge valve 15.

[0037] With the above structure, after the secondary filter cartridge 2 is back-blown cleaned, the blown dust falls into the cone 112 and enters the dust collection box 13 along the second ash pipe 14. The ash discharge valve 15 is opened after a certain period of time (waiting for the dust to fall) after the secondary filter cartridge 2 is cleaned, or it is opened at regular intervals so that the dust in the first ash pipe 12 and the second ash pipe 14 is discharged into the dust collection box 13.

[0038] like Figure 6 , 7 As shown, the secondary filter cartridge 2 is provided with a cage-shaped outer cover 16 on its outer side. The secondary filter cartridge 2 is installed and connected to the top cover 4 through the cage-shaped outer cover 16. The cage-shaped outer cover 16 has multiple cups 161 along its vertical direction, and the openings of the cups 161 face downwards. The bottom of the cage-shaped outer cover 16 is provided with a one-way valve 17, and the conduction direction of the one-way valve 17 is from the outside to the inside. The bottom end of the cage-shaped outer cover 16 is detachable to facilitate the replacement of the secondary filter cartridge 2.

[0039] Through the above structure, the cup 161 is designed to block the falling dust during backflushing of the secondary filter cartridge 2, preventing it from spreading over a large area and facilitating dust settling. The one-way valve 17 will not open unless subjected to a strong airflow, keeping it closed during air filtration to ensure that the air is filtered through the side wall of the secondary filter cartridge 2. The one-way valve operates from the outside to the inside, preventing air filtered by the secondary filter cartridge 2 from re-entering between the primary filter cartridge 1 and the secondary filter cartridge 2.

[0040] like Figure 8 As shown, the one-way valve 17 includes a bracket 171, a frustum-shaped plug 172, a spring 173, and a slide rod 174. The bottom plate of the cage-shaped outer cover 16 is provided with a frustum-shaped through hole 162. The frustum-shaped plug 172 cooperates with the frustum-shaped through hole 162 to achieve a seal. The larger diameter end of the frustum-shaped plug 172 is set upward. The slide rod 174 is fixedly set on the top of the frustum-shaped plug 172 and is slidably connected to the bracket 171 through the slide rod 174. The spring 173 is sleeved on the outside of the slide rod 174, and the two ends of the spring 173 are fixedly connected to the frustum-shaped plug 172 and the bracket 171, respectively.

[0041] Through the above structure, the spring 173 always applies a downward force to the frustum-shaped sealing member 172, causing it to seal the frustum-shaped through hole 162. During backflushing cleaning, the high-pressure gas exerts an impact force on the frustum-shaped sealing member 172, causing it to move upward. The high-pressure gas enters the secondary filter cartridge 2 through the gaps between the supports 171. After the high-pressure gas is cut off, the spring 173 drives the frustum-shaped sealing member 172 to reset and seal the frustum-shaped through hole 162.

[0042] like Figure 4 , 5As shown in Figure 9, the vertical part of the L-shaped rotating arm 71 is divided into an upper section 711 and a lower section 712. The upper section 711 is connected to the top cover 4. The lower section 712 is slidably sleeved with the bottom end of the upper section 711 and the two rotate synchronously. An electromagnet 18 is provided at the bottom of the top cover 4. A magnetic ring 19 is fixedly connected to the side wall of the lower section 712. When the electromagnet 18 is energized, it attracts the magnetic ring 19, which can drive the lower section 712 to rise.

[0043] With the above structure, when the secondary filter cartridge 2 is backflushed, the electromagnet 18 is energized to attract the magnetic ring 19, thereby driving the lower section 712 and the sealing bowl 72 to move upward, ensuring that the sealing bowl 72 is tightly attached to the bottom wall of the cage-shaped outer cover 16 of the secondary filter cartridge 2, avoiding high-pressure gas leakage and affecting the backflushing effect.

[0044] like Figure 9 As shown, the outer wall of the upper section 711 is provided with multiple limiting protrusions 7111, and the inner wall of the lower section 712 is provided with corresponding limiting grooves 7121. The limiting protrusions 7111 are slidably disposed within the limiting grooves 7121, and both the upper and lower ends of the limiting grooves 7121 are sealed. The bottom of the top cover 4 is provided with a sealing ring 20 corresponding to the top wall of the lower section 712 to achieve a seal.

[0045] Through the above structure, the limiting protrusion 7111 cooperates with the limiting slide groove 7121 to ensure that the upper section 711 and the lower section 712 rotate synchronously, and the upper and lower ends of the limiting slide groove 7121 are sealed to ensure that the lower section 712 will not separate from the upper section 711.

[0046] like Figure 1 , 2 As shown in Figures 3, 4, and 12, the system also includes a drive mechanism 20. The drive mechanism 20 includes a drive motor 201 and a bevel gear set 202. The bevel gear set 202 includes two meshing bevel gears, which are respectively fixedly mounted on the upper section 711 of the L-shaped rotating arm 71 and the output shaft of the drive motor 201.

[0047] It is worth noting that the drive motor 201 is a servo motor, which can control the angle of each rotation. A protective cover (not shown in the figure) is provided on the top cover 4, and the drive mechanism 20 is covered inside the protective cover.

[0048] With the above structure, the drive motor 201 is the power input, and the bevel gear on its output shaft drives the bevel gear on the upper section 711 to rotate, thereby driving the upper section 711 to rotate, and further driving the lower section 712 and the sealing bowl 72 to rotate, thereby aligning with one of the secondary filter cartridges 2 or moving away from the secondary filter cartridge 2.

[0049] like Figure 9As shown, the rotating sealing plate 73 is provided with a plurality of vent holes 731, the number of vent holes 731 being twice the number of the secondary filter cartridge 2, and one of the vent holes 731 being blocked.

[0050] With the above structure, the angle of each rotation of the L-shaped rotating arm 71 is the same as the angle between two adjacent vent holes 731. After cleaning one secondary filter cartridge 2, the drive motor 201 starts twice to drive the L-shaped rotating arm 71 to rotate twice, which can switch to the next secondary filter cartridge 2. The number of vent holes 731 is set to twice the number of secondary filter cartridges 2, so that when the secondary filter cartridge 2 is being cleaned, the other secondary filter cartridges 2 can work normally. When the secondary filter cartridges 2 are not being cleaned, all the secondary filter cartridges 2 are aligned with the vent holes 731, so that multiple secondary filter cartridges 2 can work at the same time.

[0051] Working principle: Normal filtration: Under the action of the induced draft fan, outside air enters the interior of housing 3 through the air inlet 31 set tangentially at the top of housing 3. The airflow flows downward along the guide of the spiral rib 62, and passes through the primary filter cartridge 1 to remove large particles of dust and impurities from the air. The preliminarily purified air enters the interior of the primary filter cartridge 1. Then it passes through the gap of the cage-shaped outer cover 16 and acts on the outer wall of the secondary filter cartridge 2. At this time, the one-way valve 17 at the bottom of the cage-shaped outer cover 16 is in a blocked state under the action of the spring 173. The air can only be finely filtered through the filtration channel of the secondary filter cartridge 2 to remove fine particles of impurities. The clean air after fine filtration by the secondary filter cartridge 2 enters the gas channel 42 inside the top cover 4. The clean air from multiple secondary filter cartridges 2 is collected in the gas channel 42 and discharged through the exhaust port 41 on the side wall of the top cover 4. It is then delivered to the compressor of the medical oxygen concentrator for compression and enters the molecular sieve for oxygen production.

[0052] Cleaning of the primary filter cartridge: As outside air enters through the inlet 31, the airflow pushes the spiral ribs 62, causing the cage-shaped rotating body to rotate continuously. The cleaning brush 63 on the inner side of the spiral ribs 62 comes into close contact with the outer wall of the primary filter cartridge 1, thoroughly scraping and cleaning the dust and impurities adhering to the surface of the filter media. The cleaned dust moves downward under the influence of airflow and gravity, accumulating at the notch 611 of the lower fixing ring 61. As the cage-shaped rotating body continues to rotate, when the notch 611 aligns with the ash discharge port 1111 on the ring body 111, the dust falls into the ash discharge port 1111 and is transported to the ash collection box 13 through the first ash discharge pipe 12.

[0053] Cleaning of the secondary filter cartridge: The secondary filter cartridge is cleaned periodically or during oxygen generator maintenance. Upon starting the cleaning process, the servo motor 201 of the drive mechanism 20 starts, driving the upper section 711 of the L-shaped rotating arm 71 to rotate via the bevel gear set 202. The upper section 711, through the engagement of the limiting protrusion 7111 and the limiting slide groove 7121, drives the lower section 712 to rotate synchronously, aligning the sealing bowl 72 with the bottom of the cage-shaped outer cover 16 on the target secondary filter cartridge 2. The electromagnet 18 at the bottom of the top cover 4 is energized, attracting the magnetic ring 19 on the side wall of the lower section 712, causing the lower section 712 to slide upwards, tightly fitting the sealing bowl 72 against the bottom wall of the cage-shaped outer cover 16. Simultaneously, the rotating sealing plate 73 on the L-shaped rotating arm 71 rotates synchronously, sealing the outlet at the top of the secondary filter cartridge 2. (The remaining secondary filter cartridges 2 still allow ventilation through the air vent 731 of the rotating sealing plate 73.) (Normal exhaust), the solenoid valve on the return air duct 10 opens, and the high-pressure gas output by the medical oxygen concentrator compressor enters the hollow channel of the L-shaped rotating arm 71 through the return air duct 10 and the rotating pipe joint 9, and finally sprays out from the sealing bowl 72. It acts on the one-way valve 17 at the bottom of the cage-shaped outer cover 16. The impact force of the high-pressure gas overcomes the elastic force of the spring 173, pushing the frustum-shaped sealing part 172 to move upward. The frustum-shaped through hole 162 opens, and the high-pressure gas enters the interior of the cage-shaped outer cover 16, performing reverse blowing on the secondary filter cartridge 2, blowing out the fine dust attached to the inside of the filter material. The dust generated by the blowing is prevented from spreading by the blocking effect of the cup 161, and falls to the surface of the cone 112 of the support plate 11 under the action of gravity. It slides down the inclined surface of the cone 112 to the second row of dust pipes 14 and merges with the dust of the first row of dust pipes 12; a single secondary filter cartridge 2 After cleaning, the solenoid valve closes, the high-pressure gas stops being delivered, and the one-way valve 17 is reset and sealed by the action of the spring 173; the electromagnet 18 is de-energized, and the lower section 712 is reset by gravity; the servo motor 201 is started twice, driving the L-shaped rotating arm 71 to rotate to the next secondary filter cartridge 2, and the above cleaning steps are repeated until all secondary filter cartridges 2 are cleaned.

[0054] Dust collection process: The dust discharge valve 15 opens at a set time according to the preset program (or opens after the dust has settled to a specified time after cleaning). The dust collected in the first dust discharge pipe 12 and the second dust discharge pipe 14 enters the dust collection box 13 for storage under the action of gravity. When the dust in the dust collection box 13 accumulates to a certain amount, the connection between the base 5 and the housing 3 can be detached, the upper and lower split structure of the dust collection box 13 can be unscrewed, and the dust can be cleaned. After cleaning, it can be reassembled and used again. Under normal circumstances, it can be cleaned every time the filter material is replaced.

Claims

1. An air filtration device for a medical oxygen concentrator, comprising a primary filter cartridge (1), a secondary filter cartridge (2), a housing (3), a top cover (4), and a base (5), characterized in that: The secondary filter cartridge (2) is provided in multiple ways and is evenly distributed in the circumferential direction inside the primary filter cartridge (1). The primary filter cartridge (1) and the secondary filter cartridge (2) can be detachably installed at the bottom of the top cover (4). The side wall of the top cover (4) is provided with an exhaust port (41), and the inside of the top cover (4) is provided with a gas channel (42). The outlet and exhaust port (41) of the secondary filter cartridge (2) are connected to the gas channel (42). The outer side of the primary filter cartridge (1) is provided with a cleaning mechanism one (6), and the inner side is provided with a cleaning mechanism two (7). The cleaning mechanism (6) is a cage-shaped rotating body. The cage-shaped rotating body includes two fixed rings (61) arranged opposite each other and multiple spiral ribs (62) connected between the two fixed rings (61). The fixed rings (61) are rotatably connected to the inner wall of the housing (3) through a sealed bearing (8). The inner side of the spiral ribs (62) is provided with a cleaning brush (63), and the cleaning brush (63) is in close contact with the outer wall of the first-stage filter cartridge (1). The upper end of the housing (3) is provided with an air inlet (31), and the air inlet (31) is arranged along the tangential direction of the housing (3) so that the incoming gas impacts the spiral ribs (62). The second cleaning mechanism (7) includes an L-shaped rotating arm (71) and a sealing bowl (72). The sealing bowl (72) is fixedly installed at the end of the horizontal section of the L-shaped rotating arm (71). The L-shaped rotating arm (71) is a hollow structure, and its top is connected to a return air conduit (10) through a rotating pipe joint (9). The other end of the return air conduit (10) is connected to the air outlet of the compressor in the medical oxygen generator. The top of the vertical section of the L-shaped rotating arm (71) passes through the top cover (4) and is rotatably connected to the top cover (4). A rotating sealing plate (73) is provided on the vertical section of the L-shaped rotating arm (71). The rotating sealing plate (73) is located in the gas channel (42) and is in close contact with the bottom wall of the gas channel (42). The rotating sealing plate (73) rotates synchronously with the L-shaped rotating arm (71) so that the sealing bowl (72) and the rotating sealing plate (73) can simultaneously cover the upper and lower ends of the same secondary filter cartridge (2).

2. The air filtration device for a medical oxygen concentrator according to claim 1, characterized in that: The bottom of the housing (3) is provided with a support plate (11). The support plate (11) includes a horizontally arranged ring (111) and a cone (112) connected to the inner side of the ring (111). The cage-shaped rotating body and the primary filter (1) are both located above the ring (111), and the secondary filter (2) is located above the cone (112).

3. The air filtration device for a medical oxygen concentrator according to claim 2, characterized in that: The spiral ribs (62) are evenly distributed along the circumference of the fixed ring (61). The fixed ring (61) located below has a notch (611) corresponding to the gap between two adjacent spiral ribs (62). The ring body (111) has multiple ash discharge ports (1111). The bottom of the ash discharge port (1111) is provided with a first ash discharge pipe (12). The ends of the multiple first ash discharge pipes (12) converge together and the bottom is connected to an ash collection box (13).

4. An air filtration device for a medical oxygen concentrator according to claim 3, characterized in that: The bottom of the cone (112) is provided with a second row of ash pipes (14), the bottom end of the second row of ash pipes (14) converges with the first row of ash pipes (12), and the top of the ash collection box (13) is provided with an ash discharge valve (15).

5. An air filtration device for a medical oxygen concentrator according to claim 1, characterized in that: The secondary filter cartridge (2) is provided with a cage-shaped outer cover (16) on its outer side. The secondary filter cartridge (2) is connected to the top cover (4) through the cage-shaped outer cover (16). The cage-shaped outer cover (16) is provided with multiple cups (161) along the vertical direction, and the opening direction of the cups (161) is downward. The bottom of the cage-shaped outer cover (16) is provided with a one-way valve (17). The conduction direction of the one-way valve (17) is from the outside to the inside.

6. An air filtration device for a medical oxygen concentrator according to claim 5, characterized in that: The one-way valve (17) includes a bracket (171), a frustum-shaped plug (172), a spring (173), and a slide rod (174). The bottom plate of the cage-shaped cover (16) is provided with a frustum-shaped through hole (162). The frustum-shaped plug (172) cooperates with the frustum-shaped through hole (162) to achieve sealing. The larger diameter end of the frustum-shaped plug (172) is set upward. The slide rod (174) is fixedly set on the top of the frustum-shaped plug (172) and is slidably connected to the bracket (171) through the slide rod (174). The outer side of the slide rod (174) is sleeved with a spring (173), and the two ends of the spring (173) are fixedly connected to the frustum-shaped plug (172) and the bracket (171) respectively.

7. An air filtration device for a medical oxygen concentrator according to claim 1, characterized in that: The vertical part of the L-shaped rotating arm (71) is divided into an upper section (711) and a lower section (712). The upper section (711) is connected to the top cover (4). The lower section (712) is slidably sleeved with the bottom end of the upper section (711) and the two rotate synchronously. An electromagnet (18) is provided at the bottom of the top cover (4). A magnetic ring (19) is fixedly connected to the side wall of the lower section (712).

8. An air filtration device for a medical oxygen concentrator according to claim 1, characterized in that: The upper section (711) has multiple limiting protrusions (7111) on its outer side wall, and the lower section (712) has a corresponding limiting groove (7121) on its inner wall. The limiting protrusions (7111) are slidably disposed in the limiting groove (7121), and both the upper and lower ends of the limiting groove (7121) are sealed.

9. An air filtration device for a medical oxygen concentrator according to claim 1 or 8, characterized in that: It also includes a drive mechanism (20), which includes a drive motor (201) and a bevel gear set (202). The bevel gear set (202) includes two meshing bevel gears, which are respectively fixed on the upper section (711) of the L-shaped rotating arm (71) and the output shaft of the drive motor (201).

10. An air filtration device for a medical oxygen concentrator according to claim 1, characterized in that: The rotating sealing plate (73) is provided with multiple vent holes (731), the number of which is twice the number of the secondary filter cartridge (2), and one of the vent holes (731) is in a blocked state.

Images