An air filtering device of a fresh air equipment

Abstract

This invention relates to an air filtration device for a fresh air system, comprising a housing and a filter element disposed within the housing. The housing is an elongated cylindrical body formed by connecting multiple sleeves end-to-end. An air inlet is located at the first end of the elongated cylindrical body, and an air outlet is located at the second end. The filter element is disposed within the elongated cylindrical body via a support assembly. The filter element includes a filter cylinder aligned with the extension direction of the elongated cylindrical body and a filter layer detachably covering the outer wall of the filter cylinder. The area between the outer wall of the filter cylinder and the inner wall of the housing forms an annular air duct communicating with the air inlet, and the inner cavity of the filter cylinder itself forms an air outlet air duct communicating with the air outlet. The filter layer of the air filtration device's filter element can be easily replaced. The housing, used for assembling the filter element, is formed by connecting multiple sleeves end-to-end, making assembly and disassembly convenient. During cleaning, the multiple sleeves can be disassembled for individual cleaning, which is very convenient and quick.

Description

Technical Field

[0001] This invention relates to the field of air filtration device technology, and more particularly to an air filtration device for a fresh air system. Background Technology

[0002] In recent years, people have paid increasing attention to indoor ventilation, leading to a surge in sales of fresh air systems. Air filters are the core component of these systems, and their filters have a limited lifespan and generally need to be replaced regularly. Otherwise, once an expired filter becomes saturated, its ability to filter pollutants such as PM2.5 will be greatly reduced, potentially causing secondary pollution.

[0003] The existing filtration devices in fresh air systems have several shortcomings: First, the filter cotton and filter cartridges in existing devices are generally bonded together with adhesive, making them difficult to clean. Furthermore, the metal frame supporting the filter cannot be reused during replacement, resulting in resource waste. The cost of multiple filter replacements can even exceed the price of the fresh air system itself, leading to high long-term operating costs. Second, the filter elements in existing devices are typically housed within a metal casing or metal air inlet duct, making it impossible to visually inspect them in real time. The wear and tear of the filter is usually assessed using a filter indicator light, which is essentially a timer. This timer cannot accurately detect filter wear and tear, relying on usage time for replacement reminders. However, this is highly dependent on the specific location and living environment, as well as the machine's operating frequency. In areas with severe air pollution, replacement intervals are shorter, making accurate assessment of filter wear and reducing reliability.

[0004] Therefore, the air filtration devices in existing fresh air systems still need further improvement. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an air filtration device that is simple in structure, easy to clean, and inexpensive to use, in light of the current state of the technology.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: an air filtration device for a fresh air equipment, comprising a housing having an air inlet and an air outlet, and a filter element disposed within the housing. The housing is a long cylindrical body formed by connecting multiple sleeves end to end in sequence. The air inlet is located at the first end of the long cylindrical body, and the air outlet is located at the second end of the long cylindrical body. The filter element is disposed within the long cylindrical body by a support assembly. The filter element includes a filter cylinder aligned with the extension direction of the long cylindrical body and a filter layer detachably covering the outer wall surface of the filter cylinder. The area between the outer wall of the filter cylinder and the inner wall of the housing forms an annular air duct communicating with the air inlet. The inner cavity of the filter cylinder itself forms an air outlet duct communicating with the air outlet.

[0007] To allow users to visually inspect the filter element in real time, each sleeve is made of a transparent polymer material. As dust accumulates on the filter layer, its color will change. Users can observe the filter layer from the outside of the housing and determine whether it needs to be replaced based on the color change.

[0008] To construct the long cylindrical structure by sequentially connecting multiple sleeve sections end-to-end, existing technologies such as threaded connections, snap-fit ​​connections, or insertion connections using intermediate pipe sections can be employed. To facilitate easier installation and disassembly of the sleeves, each sleeve in the housing is formed by openings in the bottom of the food storage container. Any two adjacent sleeve sections are sealed together by fitting them together. Furthermore, to prevent detachment after the sleeves are fitted together, the joint between the two sleeves is axially limited by a grooved fit.

[0009] In order to connect with other power equipment, the air inlet of the housing is also connected to an air inlet interface for connecting to an external pipeline, and the air outlet of the housing is connected to an air outlet sleeve for guiding air, which can be used to guide air to the air inlet of the fan.

[0010] To facilitate the connection and disassembly of the air inlet interface and the housing, a cover that can seal and fit on the air inlet of the housing is provided on the outer wall of the air inlet interface. The outer periphery of the cover is provided with a plurality of flip-up latches. The side wall of the first sleeve of the housing corresponding to the air inlet interface is provided with a limiting part that matches the latches.

[0011] As an improvement, the filter cartridge is a cylindrical component made of metal mesh, with a sealing cap fitted onto its first port and an open structure at its second port. The metal mesh construction provides excellent rigidity and effectively increases the air filtration area.

[0012] To facilitate the installation and removal of the filter element from the housing for easy cleaning or replacement of the filter layer, the support assembly includes a positioning rod on the sealing cover and a positioning disc sleeved and connected to the outer wall of the second port of the filter cartridge. The first sleeve of the housing, corresponding to the air inlet, also has a first metal mesh arranged along its cross-sectional direction. A guide sleeve for the positioning rod to pass through is located in the middle of the first metal mesh. A compression spring is sleeved on the positioning rod, with its first end abutting against the sealing cover and its second end abutting against the first metal mesh. The port edge of the second sleeve of the housing, corresponding to the location of the positioning disc on the filter cartridge, is folded inward to form an annular stop for supporting the positioning disc and forming a tight seal with it.

[0013] To limit the movement of the first metal mesh, a stop sleeve is also provided inside the first sleeve. The first metal mesh is pressed against the end face of the stop sleeve by the compression spring. Under the elastic force of the compression spring, the outer periphery of the first metal mesh can press against the annular end face of the stop sleeve. In this way, the first metal mesh is subjected to more uniform force in the circumferential direction, and will not tilt, thus affecting the firmness and stability of the filter element.

[0014] To reduce production costs, the filter layer is a multi-block structure formed by splicing together multiple medical masks. Medical masks can be purchased and replaced anytime, anywhere, making them convenient for users to obtain materials.

[0015] As an improvement, the third sleeve, which is connected to the air outlet sleeve among the multiple sleeves of the housing, is further provided with a second metal mesh arranged along the cross-sectional direction of the third sleeve. A protective sleeve is fitted around the outer periphery of the second metal mesh. A sealing ring is provided at the joint between the air outlet sleeve and the third sleeve. The sealing ring includes an annular wall and an annular flange portion formed by folding inward from the periphery of the annular wall. Annular grooves are provided on the end faces of both the annular wall and the annular flange portion. The second metal mesh serves a protective function, preventing foreign objects from entering the fan during filter cartridge disassembly.

[0016] Compared with the prior art, the advantages of the present invention are as follows: The filter layer of the air filtration device of the fresh air equipment of the present invention can be detachably wrapped on the filter cartridge, and the filter layer can be easily replaced. The housing for assembling the filter element is formed by connecting multiple sleeves end to end. This housing is easy to assemble and disassemble. During cleaning, multiple sleeves can be disassembled and cleaned separately, which is very convenient and quick. Secondly, the housing of the filtration device is a long cylindrical structure, with the air inlet and air outlet located at the two ends of the long cylindrical body, respectively. The filter element of the housing is also a cylindrical structure and is aligned with the axis of the long cylindrical body. In this way, the area between the outer wall of the filter cartridge and the inner wall of the housing forms an annular air duct, which effectively increases the filtration area, reduces the replacement frequency of the filter layer, and improves the filtration efficiency. In addition, when the pollutants on the filter layer of the filter element accumulate to a certain extent, the filter layer can be directly removed and replaced with a new filter layer. The filter cartridge structure can be reused, so the user's later use cost is lower. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention;

[0018] Figure 2 This is a longitudinal sectional view of an embodiment of the present invention;

[0019] Figure 3 This is an exploded view of an embodiment of the present invention;

[0020] Figure 4 This is a three-dimensional structural diagram of the snap-on cover according to an embodiment of the present invention;

[0021] Figure 5 This is a three-dimensional structural diagram of a single sleeve according to an embodiment of the present invention;

[0022] Figure 6 This is a three-dimensional structural diagram of a filter element equipped with a cover and a positioning plate according to an embodiment of the present invention (filter layer omitted);

[0023] Figure 7 This is a three-dimensional structural diagram of the snap-on cover according to an embodiment of the present invention;

[0024] Figure 8 This is a three-dimensional structural diagram of the positioning disk according to an embodiment of the present invention;

[0025] Figure 9 This is a three-dimensional structural diagram of the first metal mesh according to an embodiment of the present invention;

[0026] Figure 10 This is a three-dimensional structural diagram of the second metal mesh according to an embodiment of the present invention;

[0027] Figure 11 This is a three-dimensional structural diagram of the sealing ring according to an embodiment of the present invention. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0029] See Figures 1-11 An air filtration device for a fresh air system includes a housing 10, an air inlet 12, an air outlet sleeve 13, and a filter element 20 disposed within the housing 10. In this embodiment, the housing 10 is a long cylindrical structure with an air inlet at one end and an air outlet at the other. The air inlet 12 is connected to the air inlet of the housing 10, and the air outlet sleeve 13 is connected to the air outlet of the housing 10. The filter element 20 is also a cylindrical structure, with its axial direction aligned with that of the housing 10. Specifically, the filter element 20 is disposed within the long cylindrical body via a support assembly. The area between the outer wall of the filter element 20 and the inner wall of the housing 10 forms an annular air duct 30 communicating with the air inlet. The inner cavity of the filter cartridge 21 of the filter element 20 forms an air outlet duct 31 communicating with the air outlet.

[0030] See Figure 1 and Figure 3 The shell 10 is a long cylindrical body formed by connecting multiple sleeves 11 end to end. To facilitate the installation and disassembly of the sleeves 11, any two adjacent sleeves 11 in the long cylindrical body are connected by a sleeved connection. Furthermore, to prevent the sleeves 11 from detaching after being sleeved together, the joint between the two sleeves 11 is axially limited by a limiting rib. Specifically, in this embodiment, the sleeve 11 is made by creating a round hole at the bottom of the food storage container using a hole punch (see details). Figure 5 The high-speed rotation friction heat generation principle is adopted to thermoform the corresponding limiting rib 110 at the tail end of the sleeve 11. During assembly, the two sleeves 11 are inserted together and the limiting rib 110 is used to limit the axial direction.

[0031] Each sleeve 11 of the housing 10 is made of a transparent polymer material. In this embodiment, it is made by reprocessing existing food storage containers. The housing 10 is designed to be transparent and visible, allowing the user to observe the filter element 20 in real time. When dust accumulates on the filter layer 22 of the filter element 20, the color of the filter layer 22 will change. The user can observe the filter layer 22 from the outside of the housing 10 and judge whether the filter layer 22 needs to be replaced based on the color change.

[0032] See Figure 2 , Figure 4The air inlet 12 is used to connect to the air supply duct. A cover 40, capable of sealing and fitting onto the air inlet of the housing 10, is fitted onto the outer wall of the air inlet 12. Multiple flip-up latches 41 are spaced apart along the outer periphery of the cover 40. A limiting latch 42, adapted to the latches 41, is provided on the side wall of the first sleeve 11a adjacent to the air inlet 12 among the multiple sleeves 11 of the housing 10. In this embodiment, the cover 40 is obtained by opening a hole in the lid of a food storage container (see details). Figure 4 The lid of the food storage container itself has a latch 41 that can lock with the sleeve 11 (made from the box of the food storage container). After the lid of the food storage container is opened, it can be fitted and connected to the outer wall of the air inlet 12.

[0033] See Figure 2 The air outlet sleeve 13 is used to guide air to the air inlet of the fan. A second metal mesh 60 is also provided inside the third sleeve 11c, which is connected to the air outlet sleeve 13, among the multiple sleeves 11 of the housing 10. This second metal mesh 60 is arranged along the cross-sectional direction of the third sleeve 11c. The second metal mesh 60 serves a protective function, preventing foreign objects from entering the fan when the filter cartridge is disassembled. A protective sleeve 61 is also fitted around the outer periphery of the second metal mesh 60 (see details). Figure 9 The sheath 61 can be made of silicone. The silicone sheath 61 has a certain elasticity and a large frictional force with the inner wall of the third sleeve 11c, thus allowing the second metal mesh 60 to be firmly embedded in the inner hole of the third sleeve 11c through the sheath 61, preventing shaking or falling off. A sealing ring 70 is provided at the joint between the air outlet sleeve 13 and the third sleeve 11c. The sealing ring 70 includes an annular wall 71 and an annular flange portion 72 formed by folding inward from the periphery of the annular wall 71. Both the end face of the annular wall 71 and the end face of the annular flange portion 72 of the sealing ring 70 have annular grooves 73. Correspondingly, the inner port of the air outlet sleeve 13 has an outer flange 130 that can be embedded in the annular groove 73 of the annular flange portion 72 of the sealing ring 70. The air outlet sleeve 13 is fixed to the wall of the tail end of the third sleeve 11c by screws.

[0034] See Figure 3 and Figure 6 In this embodiment, the filter element 20 includes a filter cartridge 21 and a filter layer 22 detachably covering the outer wall of the filter cartridge 21. The axial direction (length direction) of the filter cartridge 21 is aligned with the axial direction of the long cylindrical body. The filter cartridge 21 is a cylindrical component made of metal mesh, which provides good rigidity support and effectively increases the air filtration area. A sealing cap 50 is fitted onto the first end of the cylindrical component. The sealing cap 50 and the cylindrical component can be connected as a single unit by bonding or welding. The second end of the filter cartridge 21 is an open structure.

[0035] See Figures 6-9 The support assembly includes a positioning rod 51 mounted on the sealing cover 50 and a positioning disc 52 sleeved and connected to the outer wall of the second port of the filter cartridge 21. Among the multiple sleeves 11 of the housing 10, the first sleeve 11a corresponding to the air inlet 12 is also provided with a first metal mesh 53 arranged along the cross-sectional direction of the first sleeve 11a. The outer periphery of the first metal mesh is also covered with a sheath 61 made of silicone material. A guide sleeve 57 for the positioning rod 51 to pass through is provided in the middle of the first metal mesh 53. A compression spring 55 is also sleeved on the positioning rod 51. The first end of the compression spring 55 abuts against the sealing cover 50, and the second end of the compression spring 55 abuts against the first metal mesh 53. To limit the movement of the first metal mesh 53, a stop sleeve 56 is also provided inside the first sleeve 11a. The first metal mesh 53 abuts against the end face of the stop sleeve 56 under the action of the compression spring 55, and the other end of the stop sleeve 56 abuts against the inner wall of the cover 40. Under the elastic force of the compression spring 55, the outer periphery of the first metal mesh 53 can abut against the annular end face of the stop sleeve 56. In this way, the first metal mesh 53 is subjected to more uniform force in the circumferential direction and will not tilt, thus affecting the firmness and stability of the filter element 20.

[0036] See Figure 6 and Figure 8 The positioning disc 52 installed on the outer wall of the second port of the filter cartridge 21 is an annular disc with a central opening made of silicone material (see details). Figure 8 In this embodiment, the second sleeve 11, which corresponds to the position of the positioning plate 52 of the filter cartridge 21, has its port edge folded inward to form an annular stop 54. Specifically, the annular stop 54 of the second sleeve 11 is formed from the remaining annular wall portion of the bottom of the food storage container after the opening. The second end of the filter cartridge 21 can be placed on the annular stop 54 of the second sleeve 11 by the positioning plate 52. In this embodiment, the diameter of the positioning plate 52 is consistent with the inner diameter of the second sleeve 11 so that the inner wall of the second sleeve 11 can limit the positioning plate 52 radially and prevent the second end of the filter cartridge 21 from shaking. In addition, since the positioning plate 52 is made of silicone material, the positioning plate 52 and the annular wall 71 can be fitted and sealed at the joint position.

[0037] In this embodiment, the second end of the filter cartridge 21 of the filter element 20 is placed on the annular stop 54 of the housing 10 via a positioning plate 52, and the first end of the filter cartridge 21 is fixed in the guide sleeve 57 of the first metal mesh 53 via a positioning rod 51. Therefore, the filter element 20 can be easily installed into the housing 10 and removed from the housing 10, which facilitates subsequent cleaning operations or replacement of the filter layer 22.

[0038] To reduce production costs, the filter layer 22 is a multi-block structure formed by splicing together multiple medical masks. Specifically, the medical masks can be N95 medical PTFE nano-masks or disposable medical masks. The N95 medical PTFE nano-mask includes a three-layer structure: a first PET protective layer on the inner layer, a second PET protective layer on the outer layer, and a PTFE nano-film layer between the two. Specifically, the circumference of several cup-shaped N95 medical PTFE nano-masks (or disposable medical masks) is completely cut off with scissors to form multiple 155*135 mm square blocks. Each square block is wrapped around the outer wall of the filter cylinder 21 and can overlap by 10 mm in the circumferential direction. Adjacent square blocks are smoothly connected in the axial direction and fixed by wrapping them with 10 mm wide cotton-based medical tape one to two times in the circumferential direction. In addition, the middle of each square block can be tightly fixed by connecting an elastic band removed from a disposable medical mask to a plastic fastener removed from an N95 medical nano-mask. In this embodiment, the medical mask used in the filter layer 22 can be purchased and replaced anytime and anywhere, making it convenient for users to obtain materials.

[0039] The air purification effect test of the air filtration device in this embodiment of the fresh air system is performed as follows: A flexible hose is connected to the interface of the air filter device, and the annular groove 73 of the sealing ring 70 of the filter device is inserted into the connection flange of the fan. Then, a cigarette is lit in a closed room to simulate a particulate pollution environment. When the concentration of particulate matter in the air reaches about 400 micrograms per cubic meter, the test begins. The fan is powered on, and the filtered air enters the sealed device through the flexible hose for testing. A laser dust meter is placed inside the sealed device to display the particulate matter pollution index of the filtered air. At the same time, another laser dust meter is placed outside the device to detect the particulate matter pollution index in the indoor environment for comparison. The data changes of the two dust meters are compared after about 10 minutes.

[0040] Test results:

[0041] 1. Filter layer 22 adopts the air filtration device of disposable medical masks. In an environment where the PM2.5 particulate matter index in the air is 350-360 micrograms per cubic meter, the particulate matter blocking rate is >75%.

[0042] 2. Filter layer 22 adopts the air filtration device of N95 medical PTFE nano-mask. In an environment where the PM2.5 particulate matter index in the air is 350-360 micrograms / cubic meter, the particulate matter blocking rate is >95%.

[0043] Advantages of the air filtration device in the fresh air system of this embodiment:

[0044] 1. The filter layer 22 of the filter element 20 of the air filtration device can be detachably wrapped on the filter cartridge 21. The filter layer 22 can be easily replaced. The housing 10 used to assemble the filter element 20 is formed by connecting multiple sleeves 11 end to end. This housing 10 is easy to assemble and disassemble. During cleaning, multiple sleeves 11 can be disassembled and cleaned separately, which is very convenient and quick.

[0045] 2. The housing 10 of the air filtration device is a long cylindrical structure, with the air inlet and air outlet located at the two ends of the long cylindrical body, respectively. The filter element 20 of the housing 10 is also a cylindrical structure and is aligned with the axis of the long cylindrical body. In this way, the area between the outer wall of the filter element 21 and the inner wall of the housing 10 forms an annular air duct 30, which effectively increases the filtration area, reduces the replacement frequency of the filter layer 22, and improves the filtration efficiency.

[0046] 3. The housing 10 of the air filter device is made of a transparent polymer material, which allows the user to observe the filter element 20 in real time. After dust accumulates on the filter layer 22 of the filter element 20, the color of the filter layer 22 will change. The user can observe the filter layer 22 from the outside of the housing 10 and judge whether the filter layer 22 needs to be replaced based on the color change.

[0047] 4. The filter layer 22 of the air filter element 20 is made of medical-grade material, which can keep the inside clean and hygienic, and reduce the risk of respiratory diseases in children and the elderly during special seasons.

[0048] 5. When the pollutants in the filter layer of the filter element accumulate to a certain extent, the filter layer 22 can be directly removed and replaced with a new filter layer. The filter cartridge structure can be reused, making the user's later use cost lower.

Claims

1. An air filtration device for a fresh air system, comprising a housing (10) having an air inlet and an air outlet, and a filter element (20) disposed within the housing (10), characterized in that: The housing (10) is a long cylindrical body formed by connecting multiple sleeves (11) end to end. The air inlet is located at the first end of the long cylindrical body, and the air outlet is located at the second end of the long cylindrical body. The filter element (20) is installed in the long cylindrical body by a support assembly. The filter element (20) includes a filter cylinder (21) that extends in the same direction as the long cylindrical body and a filter layer (22) that is detachably covered on the outer wall of the filter cylinder (21). The area between the outer wall of the filter cylinder (21) and the inner wall of the housing (10) forms an annular air duct (30) that communicates with the air inlet. The inner cavity of the filter cylinder (21) of the filter element (20) forms an air outlet duct (31) that communicates with the air outlet. The air inlet of the housing (10) is also connected to an air inlet interface (12) for connecting to an external pipe, and the air outlet of the housing (10) is connected to an air outlet sleeve (13) for guiding air. The multiple sleeves (11) of the housing are obtained by opening holes at the bottom of the box body of the food preservation box. Each sleeve (11) has a corresponding annular baffle (54) formed by the remaining annular wall part of the bottom of the box body of the food preservation box after the hole is opened. The housing (10) has a third sleeve (11c) connected to the air outlet sleeve (13) among its multiple sleeves (11), and a second metal mesh (60) is arranged along the cross-sectional direction of the third sleeve (11c). The outer periphery of the second metal mesh (60) is fitted with a protective sleeve (61). A sealing ring (70) is provided at the joint position of the air outlet sleeve (13) and the third sleeve (11c). The sealing ring (70) includes an annular wall (71) and an annular flange portion (72) formed by folding inward from the periphery of the annular wall (71). An annular groove (73) is provided on the end face of the annular wall (71) and the end face of the annular flange portion (72) of the sealing ring (70). The filter cartridge (21) is a cylindrical component made of metal mesh. A sealing cap (50) is fitted onto the first end of the cylindrical component, and the second end of the filter cartridge (21) is an open structure. The support assembly includes a positioning rod (51) provided on the sealing cap (50) and a positioning disc (52) fitted onto the outer wall of the second end of the filter cartridge (21). Among the multiple sleeves (11) of the housing (10), the first sleeve (11a) corresponding to the air inlet (12) is also provided with a first metal mesh (53) arranged along the cross-sectional direction of the first sleeve (11a). The first metal mesh (53) has a central position. A guide sleeve (57) is provided for the positioning rod (51) to pass through. A compression spring (55) is also sleeved on the positioning rod (51). The first end of the compression spring (55) abuts against the sealing cover (50), and the second end of the compression spring (55) abuts against the first metal mesh (53). The port edge of the second sleeve (11b) of the plurality of sleeves (11) of the housing (10) corresponding to the position of the positioning disk (52) of the filter cartridge (21) is folded inward to form the annular stop (54). The annular stop (54) of the second sleeve (11b) is used to place the positioning disk (52) and form a tight seal with the positioning disk (52).

2. The air filtration device of the fresh air equipment according to claim 1, characterized in that: Each of the sleeves (11) is made of a transparent polymer material.

3. The air filtration device of the fresh air equipment according to claim 2, characterized in that: Any two adjacent sleeves (11) are sealed together by fitting together.

4. The air filtration device of the fresh air equipment according to claim 1, characterized in that: The outer wall of the air inlet interface (12) is fitted with a cover (40) that can seal and fit on the air inlet of the housing (10). The outer periphery of the cover (40) is provided with a plurality of flip-up latches (41). The side wall of the first sleeve (11a) of the plurality of sleeves (11) of the housing (10) corresponding to the air inlet interface (12) is provided with a limiting part (42) that is adapted to the latches (41).

5. The air filtration device of the fresh air equipment according to claim 1, characterized in that: The first sleeve (11a) is also provided with a stop sleeve (56), and the first metal mesh (53) is pressed against the end face of the stop sleeve (56) by the action of the compression spring (55).

6. The air filtration device of the fresh air equipment according to claim 1, characterized in that: The filter layer (22) is a multi-block formed by splicing together multiple medical masks.

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