Air filter applied to airplane passenger cabin

Abstract

The utility model discloses an air filter applied to an airplane passenger cabin. The air filter comprises a filter element and a filter frame assembly, the filter element is arranged on the filter frame assembly, the filter element is a cylinder with a hollow interior and an upper opening and a lower opening, at least one rubber line is arranged in the filter element, the rubber line is annularly adhered to the inner surface of the filter element, and at least one circular-ring-shaped binding belt is arranged on the outer surface of the filter element in a sleeving manner; the filter element is of an annular structure formed by bending filter paper, and the filter paper comprises bending parts which are connected end to end and are uniformly arranged. The filter frame assembly plays a role in supporting and protecting the filter element, the rubber lines can enable bent areas on the inner side of the filter element to be evenly distributed, and therefore it is guaranteed that in the bending process of manufacturing the filter element, adjacent folded corners are not bonded, and the wind receiving area of the filter element is not reduced. The bridle is arranged on the outer surface of the filter element in a sleeving mode after the filter element is shaped, and the service life of the filter element is prolonged. Due to the arrangement of the bent part, the contact area between the filter element and air is increased, and the filtering efficiency of the filter element is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to filter technology field especially a kind of air filter applied to aircraft passenger cabin. BACKGROUND

[0002] The filter core of the existing cylindrical air filter is generally formed by one-time bending with the method of gluing line on the inner and outer surfaces.The gluing line has a specific role in this process, which can uniformly distribute the bending area of the filter core, thereby ensuring that the adjacent corners will not stick together during the bending process, avoiding reducing the wind area of the filter core.

[0003] However, this traditional manufacturing method has some drawbacks. When the filter paper is bent into a cylindrical filter core, the outer gluing line will be subjected to tension, which has the risk of being pulled apart. Moreover, the outer gluing line will generate some resistance, which will affect the filtering efficiency of the filter core, making the filtering efficiency unable to reach the ideal state. SUMMARY

[0004] The utility model aims at at least one of the technical problems existing in the prior art. To this end, the utility model provides an air filter applied to aircraft passenger cabin. This air filter cancels the outer gluing line and improves the process flow. Through the improved process flow, the filter core can still be shaped and the bending area of the filter core is uniformly distributed without outer gluing line, while saving raw materials.

[0005] According to the air filter applied to aircraft passenger cabin of the utility model embodiment, it comprises: a filter core and a filter frame assembly; the filter core is arranged in the filter frame assembly, the filter core is a hollow cylindrical body with upper and lower openings, at least one gluing line is arranged inside the filter core, the gluing line is annularly pasted to the inner surface of the filter core, and at least one annular band is arranged on the outer surface of the filter core.

[0006] According to the air filter applied to aircraft passenger cabin of the utility model embodiment, at least the following beneficial effects are achieved: the gluing line on the inner surface of the filter core can uniformly distribute the bending area on the inner side of the filter core, thereby ensuring that the adjacent corners will not stick together during the bending process of the filter core, reducing the wind area of the filter core, the band is arranged on the outer surface of the filter core after shaping, which limits the expansion deformation of the filter core, the arrangement of the bending part increases the contact area between the filter core and air, thereby increasing the filtering efficiency of the filter core.

[0007] According to some embodiments of the present application, the glue lines are arranged in at least two, and the at least two glue lines are evenly spaced in the up-down direction.

[0008] According to some embodiments of the present application, the glue lines are hot melt glue.

[0009] According to some embodiments of the present application, the belts are arranged in at least two, and the at least two belts are evenly spaced in the up-down direction.

[0010] According to some embodiments of the present application, the filter frame assembly comprises a filter core upper cover and a filter core lower cover; the filter core upper cover is arranged at the upper part of the filter core and has an upper opening; the filter core lower cover is arranged at the lower part of the filter core.

[0011] According to some embodiments of the present application, the filter core upper cover is annular, the upper opening is a circular hole, the upper opening is arranged at the middle part of the filter core upper cover, and the center of the upper opening coincides with the filter core axis.

[0012] According to some embodiments of the present application, the filter core upper cover is provided with a first mounting groove, the first mounting groove is annular, matched with the upper part of the filter core, and the upper part of the filter core is mounted in the first mounting groove.

[0013] According to some embodiments of the present application, the filter core lower cover is disc-shaped, the filter core lower cover is provided with a second mounting groove, the second mounting groove is annular, matched with the lower part of the filter core, and the lower part of the filter core is mounted in the second mounting groove.

[0014] According to some embodiments of the present application, the filter frame assembly further comprises an inner net, which is hollow cylindrical, arranged inside the filter core, the outer surface of the inner net abuts against the inner surface of the filter core, the upper end of the inner net is connected with the filter core upper cover, and the lower end of the inner net is connected with the filter core lower cover.

[0015] According to some embodiments of the present application, the filter frame assembly further comprises an outer net, which is hollow cylindrical, arranged outside the filter core, the upper end of the outer net is connected with the filter core upper cover, and the lower end of the outer net is connected with the filter core lower cover.

[0016] According to some embodiments of the present application, further comprising: a sealing ring arranged at the upper part of the filter core upper cover.

[0017] According to some embodiments of the present application, further comprising: a filter core preparation process, which comprises:

[0018] Step a, folding process: folding the first filter paper of the flat structure to obtain the second filter paper with the wrinkle-shaped bending part;

[0019] Step b, glueing process: glue one side of the second filter paper obtained in step a to form a glue line connecting the bending part;

[0020] Step c, winding process: winding the second filter paper along the side of the glue line to form a third filter paper connected at the head and tail, and the side of the glue line is located inside the third filter paper;

[0021] Step d, compression process: compressing the third filter paper by a compression device to shrink the outer diameter of the third filter paper to a set size to form a cylindrical filter paper;

[0022] Step e, tightening process: fitting the belt on the outer surface of the filter paper.

[0023] According to some embodiments of the present application, the surface of the first filter paper is rectangular.

[0024] According to some embodiments of the present application, the glue line extends along the folding direction of the second filter paper.

[0025] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0026] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0027] Figure 1 is a disassembled schematic view of an air filter applied to an aircraft cabin according to an embodiment of the present application;

[0028] Figure 2 is Figure 1 is a schematic view of an air filter applied to an aircraft cabin according to an embodiment of the present application;

[0029] Figure 3 is Figure 1 is a schematic view of a filter core of an air filter applied to an aircraft cabin according to an embodiment of the present application.

[0030] FIG. 1 is a schematic view of an air filter applied to an aircraft cabin according to an embodiment of the present application; DETAILED DESCRIPTION

[0031] The embodiments of the present application are described below in detail, and examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, and are only used to explain the present application, and cannot be understood as a limitation on the present application.

[0032] In the description of the present application, it should be understood that, in relation to the orientation description, for example, the orientation or position relationship indicated by left, right and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation on the present application.

[0033] In the description of the present application, if the first, second, etc. are described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implying the number or sequence of the indicated technical features.

[0034] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0035] Reference Figures 1 to 3 The air filter applied to the aircraft cabin in the embodiment of the present application comprises a filter element 100 and a filter frame assembly. The filter element 100 is arranged in the filter frame assembly, and the filter element 100 is a hollow cylinder type with upper and lower openings. At least one rubber thread 110 is arranged in the filter element 100, and the rubber thread 110 is annularly pasted to the inner surface of the filter element 100. At least one annular binding belt 120 is arranged on the outer surface of the filter element 100. The filter frame assembly supports and protects the filter element 100. The rubber thread 110 can uniformly distribute the areas of the filter element 100 that are bent on the inside, thereby ensuring that the adjacent corners do not adhere during the bending process of manufacturing the filter element 100, and reducing the wind area of the filter element 100. The binding belt 120 is arranged on the outer surface of the filter element 100 after the filter element 100 is shaped, and serves to limit the expansion deformation of the filter element 100.

[0036] Specifically, in some embodiments of the present application, reference Figure 1 And Figure 3 The filter element 100 is an annular structure formed by bending filter paper 130, and the filter paper 130 comprises bending portions 130a, which are uniformly arranged in series. The arrangement of the bending portions 130a increases the contact area of the filter element 100 with air, thereby increasing the filtering efficiency of the filter element 100.

[0037] In some embodiments, referring to Figure 1 The glue lines 110 are configured as at least two, and the at least two glue lines 110 are uniformly spaced along the up-down direction. The glue lines 110 can uniformly distribute the areas of the filter core 100 that are bent inward, thereby ensuring that no adhesion occurs at adjacent corners during the bending process of the filter core 100, reducing the wind area of the filter core 100, and the uniformly spaced glue lines 110 make the shape of the filter core 100 more stable.

[0038] It is conceivable that in some embodiments of the present application, the glue lines 110 can also be configured as 3, 4 or more, which can be selected according to the size of the target filter core. When the target filter core needs to be larger, the number of glue lines 110 can be increased accordingly to make the target filter core more stable and stable.

[0039] It can be understood that in some embodiments of the present application, the at least two glue lines 110 can also be unevenly spaced, as long as the positions of the at least two glue lines 110 can ensure that no adhesion occurs at adjacent corners of the filter core 100.

[0040] In some embodiments, referring to Figure 1 The glue lines 110 are hot melt glue. Hot melt glue has the characteristics of melting when heated and sticking when cooled, which is convenient for continuous, automatic and high-speed operation, improves production efficiency and reduces cost.

[0041] It is conceivable that in some embodiments of the present application, the glue lines 110 can also be configured as 3, 4 or more, which can be selected according to the size of the target filter core. When the target filter core needs to be larger, the number of glue lines 110 can be increased accordingly to make the target filter core more stable and stable.

[0042] In some embodiments, referring to Figure 2 The straps 120 are configured as at least two, and the at least two straps 120 are uniformly spaced along the up-down direction. The straps 120 can provide inward tightening restraint to the filter core 100, limit the expansion deformation of the filter core 100, and the uniformly spaced straps 120 make the shape of the filter core 100 more stable.

[0043] It is conceivable that in some embodiments of the present application, the straps 120 can also be configured as 3, 4 or more, which can be selected according to the size of the target filter core. When the target filter core needs to be larger, the number of straps 120 can be increased accordingly to make the target filter core more stable and stable.

[0044] It can be understood that in some embodiments of the present application, the at least two straps 120 can also be unevenly spaced, as long as the positions of the at least two straps 120 can ensure that the filter core 100 does not expand and deform.

[0045] In some embodiments, referring toFigure 1 With Figure 2 , the filter frame assembly comprises a filter core upper cover 200 and a filter core lower cover 300; the filter core upper cover 200 is arranged at the upper portion of the filter core 100 and has an upper opening 210; and the filter core lower cover 300 is arranged at the lower portion of the filter core 100. The filter core upper cover 200 and the filter core lower cover 300 limit and fix the filter core 100 at the middle portion, play the role of shaping and fixing, and seal the gaps at the upper and lower ends of the filter core 100, so as to prevent air from flowing out without being filtered. The upper opening 210 of the filter core upper cover 200 is connected with the inside of the filter core 100 and a third-party equipment. Since the lower portion of the filter core 100 is sealed by the filter core lower cover 300, air first enters the inside of the filter core 100 from the periphery of the filter core 100, is filtered, and then flows out to the third-party equipment through the upper opening 210 of the filter core upper cover 200.

[0046] Specifically, in some embodiments of the present application, the upper opening 210 of the filter core upper cover 200 is a circular hole, and the diameter of the upper opening 210 is smaller than the diameter of the middle opening of the filter core 100, so as to ensure that the air flowing out from the upper opening 210 all comes from the inside of the filter core 100.

[0047] It is conceivable that, in some embodiments of the present application, the upper opening 210 of the filter core upper cover 200 is a rectangular hole, a rhombic hole or other forms of holes, as long as the maximum structural size of the upper opening 210 is smaller than the diameter of the middle opening of the filter core 100.

[0048] In some embodiments, referring to Figure 1 With Figure 2 , the filter core upper cover 200 is in the form of a circular ring, the upper opening 210 is a circular hole, the upper opening 210 is arranged at the middle portion of the filter core upper cover 200, and the center of the upper opening 210 coincides with the axis of the filter core 100. The circular ring-shaped filter core upper cover 200 matches the contour of the filter core 100, more effectively seals the gap at the upper portion of the filter core 100, and saves the raw materials for manufacturing the filter core upper cover 200. The circular hole-shaped upper opening 210 enables the filtered air in the filter core 100 to flow more smoothly into the third-party equipment.

[0049] It is conceivable that, in some embodiments of the present application, the center of the upper opening 210 can also not coincide with the axis of the filter core 100, and the air in the filter core 100 can also flow out to the third-party equipment.

[0050] In some embodiments, referring to Figure 1 With Figure 2 , the filter core upper cover 200 is provided with a first mounting groove, the first mounting groove is in the form of a ring and is matched with the upper portion of the filter core 100, and the upper portion of the filter core 100 is mounted in the first mounting groove. The first mounting groove can better fix the filter core 100 and more effectively seal the gap of the filter core 100, so as to prevent unfiltered air from flowing out.

[0051] Specifically, in some embodiments of the present application, the first installation groove is arranged at the edge of the filter core upper cover 200, the center of the first installation groove coincides with the center of the filter core upper cover 200, the ring size of the first installation groove is larger than the ring size of the upper part of the filter core 100, and the first installation groove is matched with the ring gap of the upper part of the filter core 100, so that better sealing effect is obtained and the raw materials of the filter core upper cover 200 are saved, and when the size of the filter core 100 is constant, the space size occupied by the filter core upper cover 200 is saved.

[0052] It is conceivable that in some embodiments of the present application, the first installation groove can also not be arranged at the edge of the filter core upper cover 200, and can also be eccentrically arranged, which can also achieve the purpose of installing and fixing the sealed filter core 100.

[0053] In some embodiments, referring to Figure 1 and Figure 2 , the filter core lower cover 300 is disc-shaped, the filter core lower cover 300 is provided with a second installation groove, the second installation groove is annular, matched with the lower part of the filter core 100, and the lower part of the filter core 100 is installed in the second installation groove. The disc-shaped filter core lower cover 300 seals the lower end gap of the filter core 100 and the lower opening of the filter core 100, limits the air to flow out only from the upper end of the filter core 100, and the setting of the second installation groove can better fix the filter core 100 and seal the gap of the filter core 100 to a greater extent, preventing unfiltered air from flowing out.

[0054] Specifically, in some embodiments of the present application, the second installation groove is arranged at the edge of the filter core lower cover 300, the center of the second installation groove coincides with the center of the filter core lower cover 300, the ring size of the second installation groove is larger than the ring size of the lower part of the filter core 100, and the second installation groove is matched with the ring gap of the lower part of the filter core 100, so that better sealing effect is obtained and the raw materials of the filter core lower cover 300 are saved, and when the size of the filter core 100 is constant, the space size occupied by the filter core lower cover 300 is saved.

[0055] It is conceivable that in some embodiments of the present application, the second installation groove can also not be arranged at the edge of the filter core lower cover 300, and can also be eccentrically arranged, which can also achieve the purpose of installing and fixing the sealed filter core 100.

[0056] It can be understood that in some embodiments of the present application, the filter core lower cover 300 can also be provided with a lower opening, and the lower opening of the filter core lower cover 300 is connected to a third-party equipment, so that the air entering the inside of the filter core 100 can flow out to the third-party equipment through the upper opening 210 and the lower opening at the same time.

[0057] In some embodiments, referring to Figure 1, the filter frame assembly further comprises an inner net 400, the inner net 400 is in a hollow cylindrical shape, is arranged inside the filter element 100, the outer surface of the inner net 400 abuts the inner surface of the filter element 100, the upper end of the inner net 400 is connected with the filter element upper cover 200, and the lower end of the inner net 400 is connected with the filter element lower cover 300. The inner net 400 plays a supporting role for the filter element 100, and the mounting bearing capacity of the filter element 100 is increased.

[0058] Specifically, in some embodiments of the utility model, the holes in the surface of the inner net 400 are square holes, and the upper and lower ends of the inner net 400 are annular rings without holes, so as to ensure the strength of the contact between the inner net 400 and the filter element upper cover 200 and the filter element lower cover 300.

[0059] It is conceivable that, in some embodiments of the utility model, the holes in the surface of the inner net 400 can also be circular holes, triangular holes or other shaped holes.

[0060] In some embodiments, referring to Figure 1 and Figure 2 , the filter frame assembly further comprises an outer net 500, the outer net 500 is in a hollow cylindrical shape, is arranged outside the filter element 100, the upper end of the outer net 500 is connected with the filter element upper cover 200, and the lower end of the outer net 500 is connected with the filter element lower cover 300. The outer net 500 plays a protective role for the filter element 100, and the strength of the entire device is increased.

[0061] Specifically, in some embodiments of the utility model, the holes in the surface of the outer net 500 are square holes, and the upper and lower ends of the outer net 500 are annular rings without holes, so as to ensure the strength of the contact between the outer net 500 and the filter element upper cover 200 and the filter element lower cover 300.

[0062] It is conceivable that, in some embodiments of the utility model, the holes in the surface of the outer net 500 can also be circular holes, triangular holes or other shaped holes.

[0063] In some embodiments, referring to Figure 1 and Figure 2 , further comprising a sealing ring 600 arranged on the upper part of the filter element upper cover 200. The sealing ring 600 plays a sealing role when the filter element upper cover 200 is connected with a third-party device.

[0064] Specifically, the sealing ring 600 is arranged in an annular shape at the edge of the filter element upper cover 200, and the central hole of the sealing ring 600 is larger than the maximum structural size of the upper opening 210 of the filter element upper cover 200.

[0065] In some embodiments, referring to Figure 3The filter core preparation process comprises: step a, a folding process: folding the first filter paper 131 in a planar structure to obtain a second filter paper 132 in a pleated shape with a bending part 130a; step b, a gluing process: gluing one side of the second filter paper 132 obtained in step a to form a glue line 110 connecting the bending part 130a; step c, a winding process: winding the second filter paper 132 along the side where the glue line 110 is located to form a third filter paper 133 connected at the head and tail, and the side where the glue line 110 is located is located on the inner side of the third filter paper 133; step d, a compression process: compressing the third filter paper 133 by a compression device to shrink the outer diameter of the third filter paper 133 to a set size to form a cylindrical filter paper 130; and step e, a tightening process: sleeving the belt 120 on the outer surface of the filter paper 130. The filter core 100 can be obtained through the above steps.

[0066] Specifically, in some embodiments of the present application, in the folding process of step a, the first filter paper 131 is folded into the second filter paper 132 with the bending part 130a by using a filter paper folding machine. The filter paper folding machine comprises a transmission feeding device, a folding device and a transmission sending device. The folding device comprises a folding plate, a guide plate and a positioning device. The first filter paper 131 enters the folding device through the transmission feeding device. The folding plate and the guide plate guide the folding of the first filter paper 131 by sequentially reciprocating up and down, and finally output the second filter paper 132 through the transmission sending device.

[0067] It is conceivable that, in some embodiments of the present application, in the folding process of step a, the folding of the first filter paper 131 can also be completed by manual folding or a combination of manual folding and mechanical folding.

[0068] Specifically, in some embodiments of the present application, in the gluing process of step b, the gluing device is arranged at the outlet of the folding device of the filter paper folding machine, and the second filter paper 132 is generated while being synchronously glued.

[0069] It is conceivable that, in some embodiments of the present application, in the gluing process of step b, the gluing device is separately arranged, and after the second filter paper 132 is output by the filter paper folding machine, the second filter paper 132 is put into the gluing device for gluing.

[0070] Specifically, in some embodiments of the utility model, in step c winding process, adopt winding equipment to wind second filter paper 132 into third filter paper 133 connected in order, winding equipment includes two clamping parts, glue assembly and compression assembly, two clamping parts clamps two ends of second filter paper 132 respectively, glue assembly glues to the end face of two end parts of second filter paper 132, finally compression assembly compresses and sticks two end parts of second filter paper 132 to obtain third filter paper 133, at this time, third filter paper 133 is still in natural loose state, the spacing of adjacent bending part 130a is large enough, so adjacent bending part 130a will not stick together.

[0071] It is conceived that, in some embodiments of the utility model, in step c winding process, third filter paper 133 is generated by manual cooperation with glue compression equipment, glue compression equipment includes glue assembly, U-shaped supporting base and compression assembly, second filter paper 132 is manually bent, is put into the opening of U-shaped supporting base, two end parts of second filter paper 132 are in the upper portion of U-shaped supporting base, and other parts of second filter paper 132 are in the lower portion of U-shaped supporting base, glue assembly uniformly glues to two end parts of second filter paper 132, and finally compression assembly compresses and sticks two end parts of second filter paper 132 to form third filter paper 133 connected in order.

[0072] Specifically, in some embodiments of the utility model, in step d compression process, third filter paper 133 is shrunk into cylindrical filter paper 130 of set size by compression equipment, and the compression equipment includes two embracing large arms, each embracing large arm includes two embracing small arms, the embracing small arms are movably arranged at two ends of the embracing large arm, the size of the area surrounded by the two embracing large arms can be linearly adjusted by adjusting the extension amount and the extension angle of the embracing small arms, third filter paper 133 is placed between the two embracing large arms, the distance between the two embracing large arms is shrunk, thereby driving third filter paper 133 to shrink, and the extension amount and the angle of the embracing small arms are adjusted in real time to adapt to the third filter paper 133 with reduced size, and finally the purpose of uniformly shrinking third filter paper 133 to form filter paper 130 is achieved, since the inner surface of third filter paper 133 has the existence of glue line 110, the bending part 130a inside third filter paper 133 will not stick together when the spacing of the bending part 130a is reduced, and third filter paper 133 is uniformly compressed and tightened into cylindrical filter paper 130 by the compression equipment, the distance between the adjacent bending part 130a on the outer surface of third filter paper 133 changes synchronously and uniformly, and also will not stick together.

[0073] It is conceived that, in some embodiments of the present application, in the step d compression process, the compression equipment used includes two shrink cone barrels arranged oppositely, the inside of the shrink cone barrel is hollow and the hollow cavity inside is conical, the hollow cavity inside the upper shrink cone barrel is small at the top and large at the bottom, the hollow cavity inside the lower shrink cone barrel is large at the top and small at the bottom, the third filter paper 133 is placed vertically between the upper and lower shrink cone barrels, the two shrink cone barrels are close to each other, forcing the third filter paper 133 to shrink, and finally a cylindrical filter paper 130 is obtained.

[0074] Specifically, in some embodiments of the present application, in the step e tightening process, after the annular tightening band 120 is sleeved on the outer surface of the filter paper 130 in step d, the filter paper 130 is separated from the compression equipment to obtain the filter core 100.

[0075] In some embodiments, the surface of the first filter paper 131 is rectangular. The rectangular first filter paper 131 is obtained by the filter core preparation process to obtain the filter core 100.

[0076] In some embodiments, referring to Figure 3 , the glue line 110 extends along the folding direction of the second filter paper 132. The glue line 110 connects adjacent bending parts 130a to prevent the bending parts 130a from adhering to each other.

[0077] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0078] Of course, the present application is not limited to the above-mentioned embodiments, and those skilled in the art can make equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. An air filter for use in an aircraft passenger cabin, the air filter comprising: The filter core (100) is provided with at least one rubber line (110) inside, the rubber line (110) is annularly pasted to the inner surface of the filter core (100), and the outer surface of the filter core (100) is sleeved with at least one annular band (120).

2. The air filter applied to the passenger cabin of an airplane according to claim 1, wherein the rubber line (110) is configured as at least two, and the at least two rubber lines (110) are uniformly and spacedly arranged in the up-down direction.

3. The air filter applied to the passenger cabin of an airplane according to claim 1, wherein the band (120) is configured as at least two, and the at least two bands (120) are uniformly and spacedly arranged in the up-down direction.

4. The air filter applied to the passenger cabin of an airplane according to claim 1, wherein the filter frame assembly comprises a filter core upper cover (200) and a filter core lower cover (300).

5. The air filter applied to the passenger cabin of an airplane according to claim 4, wherein the filter core upper cover (200) is annular, the upper opening (210) is a circular hole, the upper opening (210) is arranged in the middle part of the filter core upper cover (200), and the center of the upper opening (210) coincides with the axis of the filter core (100).

6. The air filter applied to the passenger cabin of an airplane according to claim 5, wherein the filter core upper cover (200) is provided with a first mounting groove, the first mounting groove is annular, matched with the upper part of the filter core (100), and the upper part of the filter core (100) is mounted in the first mounting groove.

7. The air filter applied to the passenger cabin of an airplane according to claim 4, wherein the filter core lower cover (300) is disc-shaped, the filter core lower cover (300) is provided with a second mounting groove, the second mounting groove is annular, matched with the lower part of the filter core (100), and the lower part of the filter core (100) is mounted in the second mounting groove.

8. The air filter applied to the passenger cabin of an airplane according to claim 4, wherein ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The filter frame assembly further comprises an inner net (400) in a hollow cylindrical shape arranged inside the filter element (100), an outer surface of the inner net (400) abutting an inner surface of the filter element (100), an upper end of the inner net (400) connected with the filter element upper cover (200), and a lower end of the inner net (400) connected with the filter element lower cover (300).

9. The air filter applied to the passenger cabin of an airplane according to claim 4, characterized in that, The filter frame assembly further comprises an outer net (500) in a hollow cylindrical shape arranged outside the filter element (100), an upper end of the outer net (500) connected with the filter element upper cover (200), and a lower end of the outer net (500) connected with the filter element lower cover (300).

10. An air filter for use in an aircraft cabin according to claim 4, wherein, Further comprising: A sealing ring (600) arranged on an upper portion of the filter element upper cover (200).

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