Nose Filter

Abstract

The nasal filter is used to filter out suspended particulate matter, suspended droplets and harmful gases in the air, and is also used for waterproofing. The nasal filter (1) is disposed in the nasal passage and includes one connecting beam (2) and two filtering mechanisms, and both ends of the connecting beam (2) are integrally or detachably connected to two filtering mechanisms symmetrically disposed in both nasal passages (95), respectively. The connecting beam (2) semi-encloses the lower end of the nasal septum (91) and includes a middle part (21) located below the nasal septum (91) and two connecting arms (22) symmetrically disposed on both sides of the nasal septum (91). The middle part (21) is located between the two connecting arms (22). The two connecting arms (22) are connected to the two filtering mechanisms symmetrically disposed in the two nasal passages (95). The filtering mechanism includes one outer frame (3), one filter sheet (4) and one holder (5).

Description

[Technical field]

[0001] The present invention relates to the medical device technical field, and more particularly to nasal filters, especially those placed in the nasal passages. [Background technology]

[0002] People often use masks to filter pollen, dust, dander, spores, droplets, tar and other suspended particles and suspended droplets in the air, as well as harmful gases such as benzene and formaldehyde, to prevent and treat diseases such as allergic rhinitis, allergic asthma, and epidemic colds, and to avoid the infringement of air pollution. However, wearing a mask is unattractive, affects daily communication, is prone to edge leakage, affects the wearer's downward visibility, and in cold weather, the mask fogs up the glasses, further blocking the wearer's line of sight. Inhalable particulate matter and droplets mainly enter the human body through the nasal passage, so a nasal filter can be placed in the nasal passage to filter most of the inhalable suspended particles and droplets, and the nasal filter is hidden in the nasal passage, does not affect the wearer's external image and daily interaction, does not block the view, and is not prone to edge leakage, and has a certain degree of alternative to a mask.

[0003] The prior art offers many nasal filters, which can be mainly summarized into the following types: [1] A membrane filter is placed over the nostrils and attached to the face. This nasal filter is placed outside the wearer's nasal passages, which affects the wearer's external image and reduces the user's experience. In addition, since the area of ​​the nostrils is small, the membrane filter covering the nostrils cannot provide both filtration and breathability. Furthermore, the fixing method of this type of nasal filter is not reliable and is prone to falling off, which poses the risk of inhalation. [2] A filter material such as a sponge is formed into a cylindrical or hemispherical structure and placed inside the nasal passage. This nasal filter is simple in structure and convenient to use, but the filtered material comes into contact with the skin or mucous membrane of the inner wall of the nasal passage, thereby causing irritation of the nasal passage. Furthermore, in order to hold the nasal filter in the wearer's nasal passage, the filter layer of such a nasal filter is typically thicker, thereby reducing its breathability. [3] A cylindrical or hemispherical filtering material is wrapped inside a tubular outer frame, and a barrier net is provided at the end close to the inside of the nasal passage to prevent the filtering material from being sucked in, and two tubular outer frames are connected by a connecting strip located under the nasal septum when worn. This type of nasal filter can prevent the filtered liquid from contacting the nasal passage, but the filtering material is thick, the ventilation area is small, and the breathability is poor due to the shielding by the tubular outer frame and the barrier net.

[0004] In summary, due to the narrow space of the nasal passage, the ventilation area of ​​the nasal filter is much lower than that of a mask, and conventional nasal filters are difficult to achieve both filtering and breathability. Furthermore, filtering during the exhalation stage is not practical, increasing the exhalation resistance and reducing the user experience, and existing nasal filters do not achieve one-way filtering.

[0005] In addition, when the wearer is engaged in water sports, unpurified water may spill or flow into the nasal passages, which often causes rhinitis and sinusitis, so the wearer usually uses a conventional swimming nose clip to close the nasal passages. However, the use of the swimming nose clip has the following limitations: [1] It affects the wearer’s external image. (2) Wearing it for a long time can damage the wearer's nasal skin. [3] Surface sports such as surfing and rowing are different from underwater sports such as swimming and diving. Swimming nose clips only block splashes of water and close the nasal passages for long periods of time, reducing the wearer's enjoyment of the exercise and reducing the wearer's user experience. Summary of the Invention [Problem to be solved by the invention]

[0006] In summary, the prior art has been unable to provide a versatile nasal filter that has an aesthetic appearance and can be switched between water sports such as surfing and underwater sports such as swimming. [Means for solving the problem]

[0007] In order to solve the above-mentioned shortcomings in the prior art, the present invention provides a nasal filter, specifically, a nasal filter that is placed in the nasal passage, the nasal filter is placed in the nasal passage and includes one connecting beam and two filtering mechanisms, and both ends of the connecting beam are integrally or detachably connected to two filtering mechanisms that are symmetrically placed in both nasal passages. The connecting beam semi-encircles the lower end of the nasal septum and includes a middle section located below the nasal septum and two connecting arms symmetrically located on both sides of the nasal septum. The middle section is located between the two connecting arms. The two connecting arms are connected to two filtering mechanisms symmetrically located in the two nasal passages. The filtering mechanism includes an outer frame, a filter sheet, and a holder. The outer frame includes an annular frame and at least one spoke, the annular frame is a hollow annular, elliptical cylindrical or tubular structure with both ends open, which constitutes the side wall of the outer frame, and when mounted, the axis of the annular frame is parallel to the axis of the nasal passage, the outer peripheral wall of the annular frame fits the inner wall of the nasal passage, and the cavity of the annular frame penetrates along the axial direction of the nasal passage. The spoke is a strip-like structure, both ends of which are integrally or detachably connected to the top of the annular frame, and the spoke constitutes the top of the outer frame. A sheet-like filter sheet is positioned below the top of the outer frame; specifically, the filter sheet is located below the spokes and covers all of the upper openings of the annular frame; the filter sheet has one fixed part and at least one openable / closable part, the fixed part is located in the center of the filter sheet and the openable / closable part is located at the edge of the filter sheet, the lower part of the openable / closable part is not restricted by the holder, and in the exhalation state, the exhalation airflow presses the openable / closable part to switch it from a closed state to an open state, i.e., the filtration mechanism has a one-way filtration function. A holder is fitted into the cavity of the outer frame and positioned below the filter sheet, with the outer frame and the holder restraining and / or fixing the filter sheet from above and below.

[0008] As an improvement of the above technical solution, the outer frame further includes a sealing lip. The sealing lip is a straight, bent or arched strip structure, and is arranged along the edge of the top end of the annular frame. The sealing lip is integrally connected to the top of the annular frame, and its main body protrudes from the inner wall of the annular frame in the axial direction of the annular frame (in other words, protrudes toward the axis of the annular frame), and both ends of the sealing lip are integrally connected to the base parts of the spokes.

[0009] As one of the improvements of the above technical solution, at least one fixed rail is arranged vertically inside the outer frame, the fixed rail is a rectangular column or semi-cylinder, its axis is parallel to the axis of the annular frame, one side surface of the fixed rail is integrally connected to the inner wall of the annular frame, and its main body protrudes from the inner wall of the annular frame in the axial direction of the annular frame, accordingly, groove-shaped locking grooves are provided vertically on both sides of the filter sheet, and groove-shaped fixing grooves are provided vertically on both sides of the holder.

[0010] As one of the improvements of the above technical solution, the outer frame further includes at least one strip-shaped or block-shaped locking tooth, the locking tooth being arranged on the inner wall near the lower end of the annular frame, one side of which is integrally connected to the inner wall of the annular frame, and a main body of which protrudes from the inner wall of the annular frame in the axial direction of the annular frame.

[0011] In one improvement of the above technical solution, the filter sheet is an elastomer.

[0012] As an improvement of the above technical solution, the filter sheet includes one filtering layer body and one elastic layer stacked on the filtering layer body.

[0013] As an improvement of the above technical solution, the filtration layer body is a multi-layer structure arranged in a stacked manner, and includes a plurality of layer structures made of filtration materials with different filtration functions or filtration efficiencies.

[0014] As an improvement of the above technical solution, the filter sheet is a sheet body having a convex surface or a sawtooth surface.

[0015] As an improvement of the above technical solution, the openable portion is inclined downward in a direction away from the axis of the nasal passage (inclined downward as it moves away from the axis of the nasal passage).

[0016] As an improvement of the above technical solution, the openable portion is inclined downward at an increasingly larger angle in the direction away from the axis of the nasal passage.

[0017] As an improvement of the above technical solution, the holder comprises a base and at least one supporting beam. The base is a hollow annular, elliptical cylindrical or tubular structure with both ends open, located in the middle and lower part of the holder; after assembly, the axis of the base is parallel to the axis of the annular frame, its outer peripheral wall tightly engages with the inner wall of the annular frame, and the cavity of the base penetrates along the axial direction of the nasal passage. The support beam has a strip-like structure and its outer shape is straight, broken, arc-shaped, arch-shaped, rectangular with a downward opening, or trapezoidal with a downward opening, the support beam is located in the middle upper part of the holder, both ends of the support beam are connected to the top of the base or other remaining support beams, and together with the spokes, clamps (sandwiches) and fixes the fixed part of the filter sheet from both below and above, and no support beam is provided below the openable / closable part.

[0018] As an improvement of the above technical solution, the holder includes at least one side wall, which is an upright flat plate wall or an arc-shaped plate wall structure (arch-shaped plate wall structure) located in the middle upper part of the holder, the lower end of the side wall is fixed to the base, the tip (top end) is located directly below the corresponding sealing lip, and both sides are connected to the support beam, and the side wall and the sealing lip clamp and fix the edge of the fixing part of the filter sheet from both the lower and upper directions.

[0019] As one of the improvements of the above technical solution, the holder further comprises at least one snap button (snap), the snap button being an upright strip-like or sheet-like structure, the upper end of the snap being integrally connected to the edge of the underside of the base, and the body thereof protruding downward from the underside of the base.

[0020] As an improvement of the above technical solution, the holder further comprises at least one elastic carrier, the elastic carrier including at least one elastic strip and at least one selectable carrier strip, one end of the elastic strip is integrally or detachably fixed to the support beam, the main body of the elastic strip extends from the fixed point in a direction away from the nasal passage axis, and the other end is not fixed, the carrier strip is a strip-like object arranged laterally and fixed to the elastic strip, after assembly, the elastic carrier is located below the openable part, and the upper surface of the elastic carrier fits or is adjacent to the lower surface of the openable part.

[0021] As an improvement of the above technical solution, the filtering mechanism further includes a filter body, and after assembly, the filter body is disposed in the cavity of the holder.

[0022] In one improvement of the above technical solution, the filter body is an elastomer.

[0023] As an improvement of the above technical solution, the filter body is a stacked multi-layer structure, which includes multiple layer structures made of filtering materials with different filtering functions or filtering efficiencies.

[0024] As an improvement of the above technical solution, the filtering mechanism further includes a waterproof plug, which includes a plug body, at least one skirt, and at least one connecting band. The plug is a columnar structure, the cross-sectional shape and dimensions of its top are the same as those of the cavity cross-sectional shape and dimensions of the lower end of the holder or annular frame, and the plug can be packed and sealed into the lower end of the holder or annular frame. The skirt is an annular structure or an intermittent annular structure, surrounding the lower part of the plug and integrally connected with the plug. The connecting band is a band-like structure, one end of which is integrally or detachably connected to the waterproof plug and the other end of which is integrally or detachably connected to the connecting beam, outer frame or holder.

[0025] As an improvement of the above technical solution, each of the two filtering mechanisms includes a waterproof plug, one of which is provided with at least one columnar receiving plug integrally connected to and protruding from its underside, and the other waterproof plug is provided with at least one tubular receiving slot integrally connected to and protruding from its underside, the receiving plug and the receiving slot are arranged in pairs and match (fit) with each other. When the two waterproof plugs are both in an open state, the two waterproof plugs are arranged opposite each other, the receiving plug arranged on one waterproof plug is inserted into the receiving slot arranged on the other waterproof plug, and the two are tightly interlocked, and the frictional force between them is utilized to connect the two oppositely arranged waterproof plugs below the nasal septum.

[0026] As one of the improvements of the above technical solution, the connecting beam applies a clamping force to the nasal septum, and this clamping force is applied directly to both sides of the nasal septum by the two connecting arms of the connecting beam, or the clamping force is transmitted to the corresponding filtering mechanism by the two connecting arms of the connecting beam, and then applied to both sides of the nasal septum by the corresponding filtering mechanism.

[0027] The present invention has the following advantageous effects compared to the prior art: [1] The nasal filter of the present invention can be used in a variety of ways by arranging different filter sheets, and can not only filter out suspended particulate matter, suspended droplets and harmful gases in the air, but also filter out splashed water droplets when surfing or rowing. In addition, the nasal filter of the present invention has an openable waterproof plug to close the nasal passage, and compared with the conventional swimming nose clip, the nasal filter of the present invention can adapt to different water sports, and when performing surface sports such as surfing and rowing, the wearer can open the waterproof plug and breathe normally most of the time, and the filter sheet can immediately block splashed water droplets, and when performing underwater sports such as swimming and diving, the wearer can close the waterproof plug to prevent water from entering the nasal passage. Compared with the swimming nose clip, the nasal filter of the present invention has the advantages of being more aesthetic, not damaging the outer skin of the nose, and having less resistance to swimming, providing a better user experience. [2] The nasal filter of the present invention has excellent breathability. The unidirectional filtering function of the filtering mechanism significantly reduces the respiratory resistance. The nasal filter of the present invention provides a specific embodiment that increases the ventilation area and breathability by using a convex and sawtooth filter sheet. [3] The nasal filter of the present invention allows the filter sheet to be conveniently replaced, allowing the wearer to switch between a variety of uses by using different types of filters, while at the same time allowing the nasal filter body to be used for a long period of time by simply replacing the same filter sheet with a new one, thereby improving the economic efficiency of the nasal filter. [4] The nasal filter of the present invention has a compact and sturdy structure. [1] The locking teeth and snap buttons allow the wearer to conveniently attach and detach the holder and filter sheet. [2] The fixed rails are arranged to effectively prevent the holder and the filter sheet from shifting within the outer frame. [3] By arranging the waterproof plug receiving device, it is possible to effectively prevent the waterproof plug from shaking when it is in the open state, thereby improving the comfort of use. [5] A filter body is disposed within the nasal filter of the present invention, and the filter body may be a porous material such as an activated carbon sponge, and is used to filter suspended particulate matter, suspended droplets or harmful gases in the air, thereby further improving the filtering effect and range of application of the nasal filter. [Brief description of the drawings]

[0028] [Figure 1A] FIG. 1 is a side view of a human nose. [Figure 1B] FIG. 1 is a side cross-sectional view of a human nose. [Figure 1C] FIG. 2 is a bottom view of a human nose. [Diagram 2] FIG. 1 illustrates the three-dimensional structure of a first preferred embodiment of a nasal filter according to the present invention. [Diagram 3] FIG. 1 is an assembly view of a first preferred embodiment of a nasal filter according to the present invention. [Figure 4] FIG. 1 is a plan view of a first preferred embodiment of a nasal filter according to the present invention. [Diagram 5] FIG. 1 is a rear view of a first preferred embodiment of a nasal filter according to the present invention. [Figure 6] FIG. 1 is a side view of a first preferred embodiment of a nasal filter according to the present invention. [Figure 7] FIG. 1 is a bottom view of a first preferred embodiment of a nasal filter according to the present invention. [Figure 8A] FIG. 1 is a side view of a first preferred embodiment of a nasal filter according to the present invention worn on a wearer's nose. [Figure 8B] FIG. 2 is a bottom view of a first preferred embodiment of a nasal filter according to the present invention worn on a wearer's nose. [Figure 9] 1 is a schematic three-dimensional structural view of an outer frame of a first preferred embodiment of a nasal filter according to the present invention. [Figure 10] FIG. 2 is a bottom view of the housing of the first preferred embodiment of the nasal filter according to the present invention. [Figure 11] FIG. 2 is a plan view of a housing provided with a fourth spoke of a first preferred embodiment of a nasal filter according to the present invention; [Figure 12] FIG. 1 is a top view of a small spoked housing of a first preferred embodiment of a nasal filter according to the present invention; [Figure 13] FIG. 1 is a side view of a filter sheet in a first preferred embodiment of a nasal filter according to the present invention, the filter layer main body having a single-layer structure. [Figure 14] FIG. 2 is a side view of a filter sheet in a first preferred embodiment of a nasal filter according to the present invention, in which a filter layer main body has a double structure. [Figure 15] FIG. 2 is a side view of a filter sheet including one filter layer body and one elastic layer in a first preferred embodiment of a nasal filter according to the present invention. [Figure 16] FIG. 2 is a side view of the filter sheet and holder of the first preferred embodiment of the nasal filter according to the present invention. [Figure 17] FIG. 2 is a top view of the filter sheet and holder of the first preferred embodiment of the nasal filter according to the present invention. [Figure 18] FIG. 1 is a schematic diagram of a first preferred embodiment of a nasal filter according to the present invention having a one-way filtering function. [Figure 19A] 1 is a plan view showing a first distribution pattern of openable / closable portions of a filter sheet of a nasal filter according to the present invention. FIG. [Figure 19B] 4 is a schematic plan view showing a second distribution pattern of openable / closable portions of a filter sheet of a nasal filter according to the present invention. FIG. [Figure 19C] 13 is a schematic plan view showing a third distribution pattern of openable / closable portions of a filter sheet of a nasal filter according to the present invention. FIG. [Figure 20A] FIG. 2 is a schematic side view of the nasal filter according to the present invention, in which the openable / closable portion of the filter sheet is in a horizontal form. [Figure 20B] FIG. 2 is a schematic side view of a nasal filter according to the present invention, in which an openable / closable portion of a filter sheet is inclined. [Figure 21A] FIG. 2 is a schematic diagram of the three-dimensional structure of the holder of the first preferred embodiment of the nasal filter according to the present invention. [Figure 21B]FIG. 2 shows the three-dimensional structure of the holder of the first preferred embodiment of the nasal filter according to the present invention, with the side walls not shown. [Figure 22] FIG. 2 is a top view of the holder of the first preferred embodiment of the nasal filter according to the present invention. [Diagram 23] FIG. 2 is a bottom view of the holder of the first preferred embodiment of the nasal filter according to the present invention. [Figure 24] FIG. 13 is a diagram showing the three-dimensional structure of a holder provided with a fourth support beam in a first preferred embodiment of a nasal filter according to the present invention. [Diagram 25] FIG. 2 illustrates the three-dimensional structure of a holder provided with an elastic carrier in the first preferred embodiment of the nasal filter according to the present invention. [Figure 26] FIG. 2 is a plan view of a holder with an elastic carrier of a first preferred embodiment of a nasal filter according to the present invention; [Figure 27] FIG. 1 is a side view of a filter sheet and a holder with an elastic carrier of a first preferred embodiment of a nasal filter according to the present invention. [Figure 28] 1A and 1B are diagrams showing three-dimensional structures of a holder and a filter body of a first preferred embodiment of a nasal filter according to the present invention provided with the filter body. [Figure 29] FIG. 2 is an assembly view of a holder and a filter body of the first preferred embodiment of the nasal filter according to the present invention provided with the filter body. [Diagram 30] FIG. 2 is a bottom view of a holder and a filter body of the first preferred embodiment of the nasal filter according to the present invention provided with the filter body. [Diagram 31] FIG. 1 is a front view of a first preferred embodiment of a nasal filter according to the present invention with a waterproof plug; [Diagram 32] FIG. 2 is a bottom view of the first preferred embodiment of the nasal filter according to the present invention with a waterproof plug; [Diagram 33] FIG. 2 is a rear view of the filter sheet, the holder and the waterproof plug of the first preferred embodiment of the nasal filter according to the present invention, in which the waterproof plug is in a closed state. [Diagram 34]FIG. 2 is a three-dimensional structural diagram of the holder and waterproof plug of the first preferred embodiment of the nasal filter according to the present invention, in which the waterproof plug is in an open state and is accommodated; [Diagram 35] FIG. 2 is a front view of another embodiment of a nasal filter with a waterproof plug according to the present invention, with one side outer frame and connecting beam removed; [Figure 36A] FIG. 1 is a front view of a holder and a waterproof plug of a first preferred embodiment of a nasal filter according to the present invention, the waterproof plug being in an open state and not stowed; [Figure 36B] FIG. 1 is a front view of a holder and a waterproof plug of a first preferred embodiment of a nasal filter according to the present invention, the waterproof plug being in an open state and housed; [Figure 37] FIG. 2 illustrates the three-dimensional structure of a second preferred embodiment of a nasal filter according to the present invention. [Figure 38] FIG. 2 illustrates the three-dimensional structure of the outer frame of a second preferred embodiment of a nasal filter according to the present invention. [Figure 39] FIG. 2 is a bottom view of the housing of the second preferred embodiment of the nasal filter according to the present invention. [Diagram 40] FIG. 2 is a side view of a filter sheet of a second preferred embodiment of a nasal filter according to the present invention. [Diagram 41] FIG. 2 illustrates a three-dimensional structure of a holder of the second preferred embodiment of the nasal filter according to the present invention. [Diagram 42] FIG. 2 is a schematic diagram of the three-dimensional structure of a second preferred embodiment of a nasal filter according to the present invention with a protective cover; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0030] As shown in FIG. 1A, the nasal directions described in the present invention are: anterior nasal 11, posterior nasal 12, superior nasal 13, and inferior nasal 14. As shown in FIG. 1B, within the nasal passage 95, the side closer to the nasal passage axis 97 of the subject is defined as the "inner side," and the side away from the nasal passage axis 97 is defined as the "outer side."

[0031] The term "connected" in this invention means that two tangible objects are integrally or removably connected to one another by methods including, but not limited to, molding, gluing, welding, plug-in connections, threaded connections, and snap-fit ​​connections. The term "axis" in the present invention means the central symmetric axis of a tube, ring, or column. For non-standard tubes, rings, or columns, the axis of the standard tube, ring, or column that it approximates can be used as the approximate axis. For example, FIG. 1B shows the nasal passage axis 97. The term "cross section" in the present invention refers to a cross section of a tube, ring or column perpendicular to its axis.

[0032] As shown in Figures 1A, 1B and 1C, the nasal filter 1 of the present invention is applied to a human nose 9. The nose 9 is a visually visible protruding part of the face including a nasal septum 91, a nasal ala 92, a nasal dorsum 93, and a nasal base 99, and two nasal passages 95 surrounded by them. The outlets of the two nasal passages 95 are two nostrils 94. The inner surface of each of the above parts surrounding the nasal passage 95 constitutes a nasal passage inner wall 96. In the present invention, the nasal passage 95 is limited to the nasal vestibule included in the nose 9, and does not include a nasal cavity 98.

[0033] As shown in Fig. 2, the present invention provides a nasal filter 1 disposed in a nasal passage 95, the nasal filter 1 comprising one connecting beam 2 and two filtering mechanisms. Both ends of the connecting beam 2 are integrally or detachably connected to two filtering mechanisms disposed symmetrically, respectively. As shown in Fig. 8A and Fig. 8B, when worn, the two filtering mechanisms are inserted from bottom to top into the two nasal passages 95, respectively, and the connecting beam 2 surrounds half of the lower end of the nasal septum 91.

[0034] 2, 5, 8A and 8B, the connecting beam 2 includes a middle portion 21 located below the nasal septum 91 and two connecting arms 22 located on both sides of the nasal septum 91. The middle portion 21 is located between the two connecting arms 22. The two connecting arms 22 are respectively connected to two filtering mechanisms symmetrically arranged in the two nasal passages 95, and when worn, the connecting beam 2 can prevent the filtering mechanisms from being sucked in, and the wearer can also pull the connecting beam 2 to remove the nasal filter 1. Preferably, the connecting beam 2 has a U-shaped or C-shaped structure.

[0035] Preferably, the connecting beam 2 provides a fixing function for the nasal filter 1, and the minimum distance between its two connecting arms 22 is smaller than the width of the nasal septum 91 therebetween, thereby exerting a clamping force on the nasal septum 91, which is applied directly to both sides of the nasal septum 91 by the two connecting arms 22 of the connecting beam 2, or is applied to both sides of the nasal septum 91 by the outer frame 3 after being conducted to the corresponding filtering mechanism by the two connecting arms 22 of the connecting beam 2. This clamping force allows the nasal filter 1 to be clamped and fixed to the nasal septum 91.

[0036] As shown in Figures 2 and 5, two filtering mechanisms are symmetrically connected to the connecting beam 2, and each filtering mechanism includes one outer frame 3, one filter sheet 4, and one holder 5. As shown in Figure 3, when assembling, the filter sheet 4 is first inserted into the outer frame 3 from bottom to top, and then the holder 5 is inserted into the inside of the outer frame 3 from bottom to top and fixed; after assembling, the outer frame 3 and the holder 5 fitted into its cavity respectively fix the filter sheet 4 from two directions, that is, the filter sheet 4 is located between the outer frame 3 and the holder 5.

[0037] As shown in FIGS. 9 and 10, the outer frame 3 includes an annular frame 31 that constitutes the side wall of the outer frame 3 , and at least one spoke 32 that constitutes the top of the outer frame 3 .

[0038] As shown in Figs. 9 and 10, the annular frame 31 is a hollow annular, elliptical cylindrical or tubular structure with both ends open. When worn, the axis of the annular frame 31 is parallel to the nasal passage axis 97, and the outer peripheral wall of the annular frame 31 fits or tightly meshes with the inner wall 96 of the nasal passage, and the interaction force between the two fixes the nasal filter 1 in the nasal passage 95. The cavity of the annular frame 31 penetrates along the nasal passage axis 97, and the inhalation and exhalation airflows (inhalation flow and exhalation flow) can smoothly pass through the cavity of the annular frame 31. The wall of the annular frame 31 is thin to reduce resistance to breathing. As shown in Figs. 5 and 9, the annular frame 31 preferably has an irregular truncated cone shape that is small at the top and large at the bottom to better fit the shape of the nostril 95.

[0039] As shown in Fig. 9, the spokes 32 are strip-shaped (elongated) structures, and their external shapes are linear, bent, arcuate, arched, and other general and / or irregular shapes, the spokes 32 are disposed on the top of the outer frame 3, and both ends of the spokes 32 are integrally or detachably connected to different positions on the inner wall or upper surface of the top of the annular frame 31, the spokes 32 and the support beams 53 of the holder 5 sandwich and fix the filter sheet 4 from two directions, namely, above and below, and the spokes 32 restrain the filter sheet 4 and the holder 5 below the outer frame 3 to avoid the risk of inhalation. As shown in Fig. 10, the first spokes 321, the second spokes 322, and the third spokes 323 are all linear strip structures, and the first spokes 321, the second spokes 322, and the third spokes 323 are disposed on the top of the outer frame 3 in parallel with each other. As shown in FIG. 11, preferably, the first spoke 321, the second spoke 322, and the third spoke 323 are arranged parallel to each other, and the fourth spoke 324 penetrates the first spoke 321, the second spoke 322, and the third spoke 323 vertically to form a lattice structure. That is, the multiple spokes 32 can cross each other, and the crossing points are fused together to form a lattice structure. As shown in FIG. 12, preferably, small spokes 37 are provided at the top of the outer frame 3, with both ends connected between the multiple parallel spokes 32. Alternatively, one end of the small spoke 37 is connected to the spoke 32, and the other end is connected to the inner wall of the top of the annular frame 31, and plays a role in assisting the spoke 32 in the function of restraining and / or fixing the filter sheet 4. In other embodiments, the spokes 32 may be arranged non-parallel, for example, crossed and arranged in a lattice structure. One end of the small spoke 37 may be connected to the spoke 32, and the other end may be connected to the upper surface of the top of the annular frame 31.

[0040] As shown in FIG. 10 , preferably, the outer frame 3 further includes at least one sealing lip 33, which is a strip-like structure, and its shape is linear, bent, arc-shaped and other common and / or irregular shapes, and the sealing lip 33 is disposed along the top edge of the annular frame 31 to prevent leakage at the edge where the filter sheet 4 and the annular frame 31 contact. The seal lip 33 has its outer surface or underside integrally connected to the top of the annular frame 31, its main body protruding from the inner wall of the annular frame 31 in the axial direction of the annular frame 31, and both ends of the seal lip 33 integrally connected to the root portions of the spokes 32. As shown in Figure 10, both ends of the six seal lips, namely the first seal lip 331, the second seal lip 332, the third seal lip 333, the fourth seal lip 334, the fifth seal lip 335 and the sixth seal lip 336, are all integrally connected to the root portions of the spokes 32, completely covering the contact points between the filter sheet 4 and the annular frame 31.

[0041] 9 and 10, it is preferable that the outer frame 3 is provided with at least one fixed rail 34 extending vertically from its upper end to its lower end in order to fix the filter sheet 4 and the holder 5. The fixed rail 34 is a square column or semi-cylinder whose axis is parallel to the axis of the annular frame 31, one side of the fixed rail 34 is integrally connected to the inner wall of the annular frame 31, and its main body protrudes from the inner wall of the annular frame 31 in the axial direction of the annular frame 31. As shown in Figures 3, 13, 21A and 21B, a groove-shaped locking groove 43 is formed vertically on the side of the filter sheet 4, and a groove-shaped fixing groove 55 is formed vertically on the side of the holder 5. When assembling, the locking groove 43 and the fixing groove 55 are aligned with the fixed rail 34, and the filter sheet 4 and the holder 5 are sequentially inserted into the outer frame 3 along the fixed rail 34. After assembly, the locking groove 43, the fixing groove 55 and the fixed rail 34 are tightly interlocked, preventing the filter sheet 4 and the holder 5 from being displaced laterally or rotationally within the outer frame 3.

[0042] 10, the inner wall of the annular frame 31 is preferably provided with at least one strip-shaped or block-shaped locking tooth 35 for fixing the holder 5 so as not to slip out of the outer frame 3. The locking tooth 35 is disposed on the inner wall close to the lower end of the annular frame 31, one side of which is integrally connected with the inner wall of the annular frame 31, and its main body protrudes from the inner wall of the annular frame 31 in the axial direction of the annular frame 31. During assembly, after the holder 5 is inserted into the cavity of the annular frame 31 from the bottom end, the outer peripheral wall of the base 51 fits with the inner wall of the annular frame 31, and the upper surface of the locking tooth 35 is caught by the edge of the lower surface of the base 51, preventing the holder 5 from slipping out below the outer frame 3.

[0043] As shown in Figures 2 and 37, it is preferable to form the top of the outer frame 3 into a convex or sawtooth shape, so that it can be fitted with a filter sheet 4 of the same shape to increase the filtering area and improve breathability. As shown in Figure 42, in order to prevent the sharp part of the top of the annular frame 31 from piercing the inner wall 96 of the nasal passage, an annular protective cover 36 is further covered on the outer periphery of the outer frame 3 to surround the upper part of the outer frame 3 from the outside, and its lower end is connected to the upper end of the annular frame 31 so that the upper end of the protective cover 36 does not fall below the highest point of the annular frame 31.

[0044] As shown in Figs. 2, 3 and 13, the filter sheet 4 is a sheet-like object located below the top of the outer frame 3. Specifically, the filter sheet 4 is located below the spokes 32 and fixed between the outer frame 3 and the holder 5. In a natural state, the filter sheet 4 covers the entire upper opening of the annular frame 31, and its upper surface and side surface fit the inner wall of the outer frame 3, keeping the filter sheet 4 and the outer frame 3 in a sealed state. As shown in Figs. 13 and 40, the filter sheet 4 is preferably a convex or sawtooth sheet body, which can significantly increase the ventilation area compared to a flat sheet body, and can improve the breathability and comfort of the nasal filter 1. As shown in Fig. 13, at least one groove-shaped locking groove 43 is provided vertically on the side of the filter sheet 4, and the locking groove 43 is preferably engaged with the fixing rail 34 on the outer frame 3 to fix the filter sheet 4. Preferably, the filter sheet 4 is an elastomer that helps the filtering mechanism to have a unidirectional filtering function.

[0045] As shown in FIG. 13, the filter sheet 4 includes one filter layer body 41, and filters particulate matter, liquid droplets, splashed water droplets, or harmful gases in the air. When a filter material such as nonwoven fabric, filter cotton, meltblown fabric, artificial sponge, fine metal mesh, or polyester fiber mesh is used for the filter layer body 41, it is possible to filter particulate matter or suspension droplets in the air. When a filter material such as activated carbon sponge or activated carbon cotton is used for the filter layer body 41, it is possible to filter harmful gases in the air. When a filter material containing a bactericidal or sterilizing substance such as nanosilver is used for the filter layer body 41, it is possible to kill bacteria and viruses attached to particulate matter or suspension droplets in the air. When a wire mesh or polyester fiber mesh with an appropriate pore size is used for the filter layer body 41, it is possible to use the surface tension of water to prevent water droplets from splashing up during surface exercise such as surfing or rowing, and to prevent water droplets from jumping into the nasal passages and causing rhinitis or sinusitis.

[0046] As shown in Fig. 14, the filter layer body 41 is preferably a two-layer structure arranged in a stacked manner, including a first filter layer body 411 and a second filter layer body 412 with different functions, which can be bonded to each other or not, the first filter layer body 411 can adopt a strong filter material (high-efficiency filter material) or a medium-efficiency filter material, etc., the second filter layer body 412 can adopt an initial-efficiency filter material, an activated carbon filter material, or a nano-silver filter material, etc., and the combination of the two filter layers can meet new filtration requirements. As an optimization, the filter layer body 41 can be a multi-layer structure arranged in a stacked manner, each layer adopts one of the above filter materials, and the combination of multiple filter layers can meet higher filtration requirements.

[0047] As shown in Fig. 15, when the elasticity of the filtration layer main body 41 is insufficient, it is preferable to provide an elastic layer 42 on the filter sheet 4 to increase the elasticity of the filter sheet 4, thereby assisting the filtration mechanism in the one-way filtration function described later. When the filtration layer main body 41 and the elastic layer 42 are arranged in a laminated manner, and the elastic layer 42 is located below the filtration layer main body 41, the two may or may not be bonded to each other, but when the elastic layer 42 is located above the filtration layer main body 41, the two are bonded to each other so that the elastic force of the elastic layer 42 is imparted to the filtration layer main body 41. The dimensions of the elastic layer 42 may be equal to or smaller than the dimensions of the filtration layer main body 41, and the material of the elastic layer 42 may be an elastic mesh, strip, or sheet.

[0048] The filtering mechanism of the nasal filter 1 of the present invention has a one-way filtering function, and as shown in Figures 16, 17 and 18, the filter sheet 4 includes one fixed part 44 and at least one openable / closable part 45, the fixed part 44 is located at the center of the filter sheet 4, and after assembly, the fixed part 44 is firmly sandwiched between the outer frame 3 located above it and the holder 5 located below it, so that the fixed part 44 is not displaced inside the outer frame 3. The openable / closable parts 45 are located on both side edges of the filter sheet 4, and their upper parts are restrained by the outer frame 3, but their lower parts are not restrained by the holder 5. Therefore, when the openable / closable part 45 is in a closed state, when the openable / closable part 45 is biased downward from above, the openable / closable part 45 can move downward and open from the closed position where it fits against the underside of the top of the outer frame 3. Preferably, the arrangement of the openable / closable portion 45 in the filter sheet 4 may be varied. For example, as shown in FIG. 19A, the openable / closable portion 45 is provided on one side edge of the filter sheet 4, as shown in FIG. 19B, the openable / closable portion 45 is provided on both side edges of the filter sheet 4, and as shown in FIG. 19C, the openable / closable portion 45 is provided on the annular edge of the filter sheet 4.

[0049] As a result, as shown in FIG. 18, the openable / closable portion 45 has the following two states. [1] Closed state: In the natural state and the intake state, the upper surface and the side surface of the openable / closable part 45 fit to the inner wall of the outer frame 3, keeping the space between the filter sheet 4 and the outer frame 3 in a sealed state, and the intake airflow can only pass through the filter sheet 4. The filtering mechanism performs a one-way filtering function. [2] Open state: In the exhalation state, the openable / closable part 45 receives a large air pressure from above and moves downward to the position of the openable / closable part 45' in the open state, at which point a gap is created between the filter sheet 4 and the outer frame 3 through which most of the exhaled air passes, and the filtering mechanism does not perform a filtering function. When the exhalation state ends, the repulsive force of the filter sheet 4 causes the openable / closable part 45 to return to its natural closed state.

[0050] The beneficial effect of the one-way filtration function is that the exhaled air flow no longer passes through the filter sheet 4, but directly through the gap between the filter sheet 4 and the outer frame 3, greatly reducing the exhalation resistance and greatly improving the breathability and comfort of the nasal filter 1 in the exhalation state.

[0051] In order to better realize the one-way filtering function, it is preferable to incline the openable / closable part 45 downward in a direction away from the nasal passage axis 97 as shown in Fig. 16 and Fig. 40 to improve the ventilation efficiency in the open state of the openable / closable part 45, and when the openable / closable part 45 moves from the closed state to the open state of the openable / closable part 45' as shown in Fig. 20A and Fig. 20B, the gap between the openable / closable part 45 in the inclined state shown in Fig. 20B and the outer frame 3 is significantly larger than the gap between the openable / closable part 45 in the horizontal state shown in Fig. 20A and the outer frame 3. As a further optimization, the openable / closable part 45 gradually increases its downward inclination angle in a direction away from the nasal passage axis 97 to further improve the ventilation efficiency in the exhalation phase.

[0052] As shown in Figures 2, 3, 21A and 21B, the holder 5 is fitted into a cavity of the outer frame 3, and the holder 5 is located below the filter sheet 4 and includes one base 51 and at least one support beam 53.

[0053] As shown in Figures 21A, 21B, 22 and 23, the base 51 is a hollow annular, elliptical cylindrical or tubular structure with both ends open, and is located in the lower middle part (lower center part) of the holder 5. After assembly, the axis of the base 51 is parallel to the axis of the annular frame 31, and its outer peripheral wall is tightly engaged with the inner wall of the annular frame 31, and the mutual force between them fixes the holder 5 in the cavity of the outer frame 3. The cavity of the base 51 penetrates along the nasal passage axis 97, and the inhalation and exhalation airflows can smoothly pass through the cavity. The wall of the base 51 is thin to reduce the resistance to breathing.

[0054] As shown in Figs. 21A, 21B, 22 and 41, the support beam 53 has a strip-like structure and is located in the upper middle part (upper center part) of the holder 5. The outer shape of the support beam 53 is a straight line, a broken line, an arc, an arch, a rectangle that opens downward, a trapezoid that opens downward, or other general shape and / or irregular shape, and both ends of the support beam 53 are connected to the top of the base 51 or other support beams, and clamp and fix the fixing part 44 of the filter sheet 4 from both the lower and upper directions together with the spokes 32. As shown in Figs. 10 and 22, the first spokes 321 and the first support beam 531, the second spokes 322 and the second support beam 532, and the third spokes 323 and the third support beam 533 clamp and fix the corresponding parts of the fixing part 44 one-to-one. As shown in Figs. 24 and 41, the multiple support beams 53 cross each other, and the crossing parts are preferably fused together to form a lattice structure.

[0055] As shown in Figures 21A, 21B and 22, the holder 5 further has at least one side wall 52, which is an upright flat wall or an arc-shaped (bow-shaped) plate wall structure and is located in the middle upper part of the holder 5, the side wall 52 stands vertically on the base 51, its bottom end is fixed to the base 51, its upper end is located directly below the corresponding sealing lip 33, and both sides are preferably connected to the support beam 53. The side walls 52, together with the seal lip 33, clamp and fix the edge of the fixed portion 44 of the filter sheet 4 from both below and above, and when the side walls 52 are provided, as shown in Figures 10 and 22, the first seal lip 331 and the first side wall 521, the second seal lip 332 and the second side wall 522, the third seal lip 333 and the third side wall 523, and the fourth seal lip 334 and the fourth side wall 524 correspond one-to-one to each other and clamp and fix the edge of the fixed portion 44 at that location, as shown in Figures 10 and 22.

[0056] 21A and 23, the holder 5 is further provided with at least one snap button 54, which is an upright strip-like or sheet-like structure and is located below the edge of the lower surface of the base 51, and the snap button 54 is used to assist the wearer in removing the holder 5 from the outer frame 3. The upper end of the snap button 54 is integrally connected to the edge of the lower surface of the base 51, and its body protrudes downward from the lower surface of the base 51. When removing the holder 5, the wearer pulls the snap button 54 in the direction of the nasal passage axis 97 to create a gap between the outer peripheral wall of the base 51 and the inner wall of the outer frame 3 at this location, thereby releasing the holder 5 from the binding of the annular frame 31 and the locking teeth 35, and allowing it to be smoothly removed.

[0057] 21A and 21B, preferably, at least one groove-shaped fixing groove 55 is provided in the vertical direction on the side surface of the holder 5. The fixing groove 55 fits into the fixing rail 34 of the outer frame 3 to fix the holder 5.

[0058] As shown in Figures 25, 26, and 27, the upper part of the holder 5 is preferably provided with at least one elastic carrier 56 that assists the opening and closing part 45 to return to the closed state. The elastic carrier 56 includes at least one elastic strip 561 and at least one optional carrier strip 562. The elastic strip 561 is a strip made of an elastic material, and its outer shape is linear, bent, arcuate, or arch-shaped. One end of the elastic strip 561 is integrally or detachably fixed to the support beam 53, and its main body extends from the fixed point in a direction away from the nasal passage axis 97, and the other end is not fixed (unfixed). The carrier strip 562 is a horizontal strip-like object fixed to the elastic strip 561. As shown in Figure 27, after assembly, the elastic carrier 56 is positioned below the openable / closable portion 45 of the filter sheet 4, with its upper surface fitting or being close to the lower surface of the openable / closable portion 45. During exhalation, the openable / closable portion 45 is pushed to an open state by the exhaled airflow, causing the elastic carrier 56 to bend downward, and after exhalation ends, the repulsive force of the elastic carrier 56 causes the openable / closable portion 45 to return to a closed state more quickly.

[0059] As shown in Figures 28, 29 and 30, it is preferable that one more block-shaped filter body 7 is disposed in the cavity of each filtering mechanism, and the filter bodies 7 of the two filtering mechanisms are disposed symmetrically. The filter body 7 is formed of a filtering material to enhance the filtering ability of the filtering mechanism. As shown in Figure 29, during assembly, the filter body 7 is inserted into the cavity of the holder 5 from the lower opening of the holder 5. Preferably, the filter body 7 is an elastomer, which can be easily assembled into the holder 5; at the same time, as an elastomer, the filter body 7 located below the filter sheet 4 does not affect the filter sheet 4 to enter the open state, and also uses the own elastic force of the filter body 7 to help the filter sheet 4 to quickly return to the closed state after the end of exhalation. 30, in order to better fix the filter body 7, at least one fixing tooth 57 is integrally disposed on the inner wall near the lower end of the holder 5, the fixing tooth 57 is a block, sheet or strip, one side of which is integrally connected to the inner wall of the lower part of the holder 5, and its body protrudes from the inner wall of the holder 5 in the direction of the nasal passage axis 97, and after the elastic filter body 7 is assembled in place, the fixing tooth 57 locks the filter body 7 from below, making it difficult to slip out of the holder 5. For optimization, the filter body 7 can be a multi-layer structure including filter layers with different functions arranged in layers, each layer adopting a filtering material for different efficiency or different filtering purpose, and higher filtering requirements can be met by combining multiple filter layers.

[0060] As shown in Figures 31, 32, 33, 34, 35, 36A and 36B, each filtering mechanism is further provided with an openable and closable waterproof plug 6, and the waterproof plugs 6 of the two filtering mechanisms are arranged symmetrically. When the wearer is engaged in underwater activities such as swimming or diving, this waterproof plug 6 is in a closed state to block the inflow of water into the nasal passage 95, and when the wearer stops the underwater activity, this waterproof plug 6 is in an open state to allow normal breathing through the nose.

[0061] As shown in Fig. 32 and Fig. 36A, the waterproof plug 6 includes a plug body (plug body) 61, at least one skirt 62, and at least one connection band 65. The plug body 61 has a columnar structure, and the cross-sectional shape and dimensions of its top are the same as those of the cross-sectional shape and dimensions of the cavity at the lower end of the holder 5. As shown in Fig. 33, in order to close the waterproof plug 6, the wearer inserts the plug body 61 from below to above into the lower end of the holder 5, and fixes the plug body 61 inside the holder 5 by utilizing the frictional force caused by the engagement between the two. At this time, the plug body 61 completely blocks the lower end opening of the holder 5, and water does not enter the nasal passage 95. When the wearer removes the plug body 61 from the holder 5, the waterproof plug 6 is in an open state, and the wearer can breathe normally.

[0062] 32 and 36A, the skirt 62 has an annular structure or an intermittent annular structure, surrounds the lower part of the plug 61, and is integrally connected to the plug 61. When the waterproof plug 6 is in a closed state, the skirt 62 is hooked on the lower part of the holder 5, preventing the plug 61 from penetrating too deeply into the cavity of the holder 5 and becoming difficult to remove. In addition, the skirt 62 can enhance the sealing effect of the joint between the waterproof plug 6 and the holder 5.

[0063] As shown in Figures 32 and 36A, the connection band 65 has a band-like structure, one end of which is integrally or detachably connected to the waterproof plug 6, and the other end of which is integrally or detachably connected to the connection beam 2, outer frame 3 or holder 5.

[0064] As shown in Fig. 35, in another specific embodiment, the waterproof plug 6 comprises one plug body 61, at least one skirt 62, and at least one connecting band 65. The plug body 61 also has a columnar structure, and the shape and dimensions of the cross section of its top are the same as those of the cavity cross section at the lower end of the annular frame 31. To close the waterproof plug 6, the wearer inserts the plug body 61 from below to above the lower end of the annular frame 31, and the frictional force caused by the engagement of the two fixes the plug body 61 inside the annular frame 31. At this time, the plug body 61 completely blocks the lower end opening of the outer frame 3, and water does not enter the nasal passage 95. When the wearer removes the plug body 61 from the outer frame 3, the waterproof plug 6 is in an open state, and the wearer can breathe normally. The skirt 62 is an annular structure or an intermittent annular structure, which surrounds the lower part of the plug 61 and is integrally connected to the plug 61, and when the waterproof plug 6 is in a closed state, the skirt 62 is hooked under the annular frame 31, making the plug 61 penetrate deeply into the cavity of the outer frame 3 and difficult to remove, and the skirt 62 can enhance the sealing effect of the joint between the waterproof plug 6 and the annular frame 31. The connecting band 65 is a belt structure having one end integrally or detachably connected to the waterproof plug 6 and the other end integrally or detachably connected to the connecting beam 2 or the outer frame 3.

[0065] As shown in Fig. 32, Fig. 36A and Fig. 36B, preferably, two waterproof plugs 6 arranged symmetrically are further provided with a storage device. One waterproof plug 6 is provided with at least one columnar storage plug 63 connected to an integral part protruding from its lower surface, and the other waterproof plug 6 is provided with at least one tubular storage slot 64 connected to an integral part protruding from its lower surface, and the storage plug 63 is arranged in pairs with the storage slot 64 and matches each other. As shown in Fig. 36A and Fig. 36B, when the two waterproof plugs 6 are both in an open state, when the storage plug 63 provided on one waterproof plug 6 is inserted into the storage slot 64 provided on the other waterproof plug 6 and the two waterproof plugs are tightly engaged, the friction between the two waterproof plugs 6 connects the two waterproof plugs 6 below the nasal septum 91, and the waterproof plugs 6 are prevented from vibrating and causing discomfort to the wearer.

[0066] In summary, the filtering mechanism of the nasal filter 1 of the present invention has the following advantages. [1] Applicable to various scenes. First, the filter sheet 4 and the filter body 7 can filter suspended particulate matter, suspended droplets or harmful gases in the air. Second, when exercising on the surface of the water, such as surfing or rowing, the filter sheet 4 can block splashed water droplets, avoiding rhinitis or sinusitis caused by water droplets spilling into the nasal passage 95. After the water droplets slide off the filter sheet 4, the wearer can breathe smoothly again, so there is no need to use a conventional swimming nose clip to close the nasal passage 95 for a long time. Third, when performing underwater exercises such as swimming or diving, the waterproof plug 6 can prevent water from flowing into the nasal passage 95. As a result, for people who spend their holidays at the beach and lakeside, when people switch between surface and underwater exercises, they can switch between different usage modes by turning on or off the waterproof plug 6 to obtain optimal protection effects and user experience. [2] The filter sheet 4 has a convex or sawtooth shape, which increases the ventilation area of ​​the filtering mechanism and significantly improves the breathability and comfort of the nasal filter 1. [3] The filtration mechanism has a one-way filtration function, improving the breathability and comfort of the wearer during the exhalation phase. [4] The filtering mechanism is located inside the nasal passage 95, which is less visible and more beautiful than a mask. The nasal filter 1 of the present invention is waterproof, does not damage the skin outside the nose, and has less resistance when swimming compared to a nose clip for swimming. [5] The structure is compact, sturdy, and easy to assemble and disassemble. Filter sheets 4 and filter bodies 7 of different types and efficiencies can be conveniently replaced, making it more versatile. In a single application, it is only necessary to replace the filter sheets 4 and filter bodies 7 periodically, and other parts can be reused, making it more economical.

[0067] Example 1 Figures 2, 3, 4, 5, 6, 7, 8A, 8B, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 21A, 21B, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 36A and 36B show a first preferred embodiment of the present invention. As shown in Figure 2, the nasal filter 1 includes a connecting beam 2 and two filtering mechanisms. Both ends of the connecting beam 2 are integrally or detachably connected to two filtering mechanisms that are symmetrically installed, respectively. As shown in FIGS. 8A and 8B, when worn, the two filtering mechanisms are inserted from bottom to top into the two nasal passages 95, respectively, and the connecting beam 2 surrounds half of the lower end of the nasal septum 91.

[0068] As shown in Figures 2, 5, 8A and 8B, the connecting beam 2 is U-shaped. The connecting beam 2 includes a middle portion 21 located below the nasal septum 91 and two connecting arms 22 located on both sides of the nasal septum 91. The middle portion 21 is located between the two connecting arms 22. The two connecting arms 22 are respectively connected to two filtering mechanisms provided symmetrically in the two nasal passages 95. The connecting beam 2 also provides a fixing function for the nasal filter 1, and when worn, the minimum spacing between the two connecting arms 22 is smaller than the width of the nasal septum 91 at that point, thereby exerting a clamping force on the nasal septum 91 directly from the inside of the two connecting arms 22 of the connecting beam 2 to both sides of the nasal septum 91.

[0069] As shown in Figures 2 and 5, two filtering mechanisms are symmetrically connected to the connecting beam 2, and each filtering mechanism includes one outer frame 3, one filter sheet 4, and one holder 5. As shown in Figure 3, during assembly, the filter sheet 4 is inserted into the outer frame 3 from bottom to top, and the holder 5 is inserted into the inside of the outer frame 3 from bottom to top and fixed. After the assembly is completed, the outer frame 3 and the holder 5 fitted into its cavity fix the filter sheet 4 from two directions, that is, the filter sheet 4 is located between the outer frame 3 and the holder 5.

[0070] 9 and 10 , the outer frame 3 includes one annular frame 31, three spokes 32, six seal lips 33, two fixing rails 34, and two locking teeth 35. The annular frame 31 constitutes the side wall of the outer frame 3, and the spokes 32 and the seal lips 33 form the top of the outer frame 3.

[0071] 9 and 10, the annular frame 31 is a hollow annular structure with both ends open, and its outer shape is an irregular trapezoid smaller at the top and larger at the bottom. When worn, the axis of the annular frame 31 is parallel to the nasal passage axis 97, and the outer peripheral wall of the annular frame 31 fits or tightly meshes with the inner wall 96 of the nasal passage, and the interaction force between the two fixes the nasal filter 1 in the nasal passage 95. The cavity of the annular frame 31 penetrates along the nasal passage axis 97, allowing the inhalation and exhalation airflows to pass smoothly through the cavity of the annular frame 31. The wall of the annular frame 31 is thin to reduce resistance to breathing.

[0072] As shown in FIG. 9 , the three spokes 32 and the six sealing lips 33 together form the top of the outer frame 3, which has a smooth convex structure and matches with the filter sheet 4 of the same shape below, making the filtering area of ​​the filtering mechanism larger than that of a filtering mechanism with the outer frame 3 having a flat top, thereby improving the breathability and comfort of the nasal filter 1.

[0073] As shown in Fig. 9, the three spokes 32 are all linear strip structures, specifically the first spoke 321, the second spoke 322 and the third spoke 323, the three spokes are arranged parallel to each other on the top of the outer frame 3, both ends of each spoke are integrally connected to different positions on the inner wall of the top of the annular frame 31, the spokes 32 and the support beam 53 of the holder 5 sandwich and fix the filter sheet 4 from above and below, the spokes 32 restrain the filter sheet 4 and the holder 5 below the outer frame 3 to avoid the risk of inhalation. As shown in Fig. 11, as an optimization, the outer frame 3 further includes a fourth spoke 324 intersecting the first spoke 321, the second spoke 322 and the third spoke 323, and the intersecting points are integrated to form a lattice structure. 12, for optimization, two small spokes 37 are further provided at the top of the outer frame 3, one of which has both ends connected to the middle of the first spoke 321 and the second spoke 322, which are arranged parallel to each other. The other small spoke 37 has one end connected to the middle of the third spoke 323 and the other end connected to the inner wall of the top of the annular frame 31. The small spokes 37 are attached to assist the spokes 32 which perform the function of restraining and / or fixing the filter sheet 4.

[0074] As shown in FIG. 10 , the six sealing lips 33 are linear or arcuate strip-like structures, specifically, a first sealing lip 331, a second sealing lip 332, a third sealing lip 333, a fourth sealing lip 334, a fifth sealing lip 335 and a sixth sealing lip 336. The six sealing lips 33 are arranged along the top edge of the annular frame 31 to completely cover the contact points between the filter sheet 4 and the annular frame 31, and prevent leakage from occurring at the contact edges between the filter sheet 4 and the annular frame 31. The seal lip 33 has an outer side integrally connected to the top of the annular frame 31, and its main body protrudes from the inner wall of the annular frame 31 in the axial direction of the annular frame 31. Both ends of the seal lip 33 are integrally connected to the root portions of the spokes 32. For example, both ends of the first seal lip 331 are connected to the root portions of the first spoke 321 and the second spoke 322, respectively, and both ends of the fifth seal lip 335 are connected to the two root portions of the first spoke 321, respectively.

[0075] 9 and 10, two upright triangular prism-shaped fixed rails 34 are provided vertically on opposing sides (opposing side surfaces) of the annular frame 31 to fix the filter sheet 4 and the holder 5. One side of the fixed rail 34 is integrally connected to the inner wall of the annular frame 31, and the main body thereof has a triangular prism-shaped structure that protrudes from the inner wall of the annular frame 31 in the axial direction of the annular frame 31. An arc-shaped chamfer is provided at the bottom of the fixed rail 34, making it easy to attach the filter sheet 4 and the holder 5. As shown in Figures 3, 13, 21A and 21B, two groove-shaped locking grooves 43 are arranged vertically at corresponding positions on both sides of the filter sheet 4, and two groove-shaped fixing grooves 55 are arranged vertically at corresponding positions on both sides of the holder 5. When assembling, the locking grooves 43 and the fixing grooves 55 are aligned with the fixed rail 34, and the filter sheet 4 and the holder 5 are sequentially inserted into the outer frame 3 along the fixed rail 34. After assembly, the locking grooves 43, the fixing grooves 55 and the fixed rail 34 are tightly interlocked, thereby preventing the filter sheet 4 and the holder 5 from being displaced laterally or rotationally within the outer frame 3.

[0076] 10, two arc-shaped strip-shaped locking teeth 35 are provided laterally on the inner wall of both front and rear ends near the bottom end of the annular frame 31. One side surface of the locking teeth 35 is integrally connected to the inner wall of the annular frame 31, and the main body protrudes from the inner wall of the annular frame 31 in the axial direction of the annular frame 31 to form an arc-shaped strip-shaped structure. During assembly, after the holder 5 is inserted into the cavity of the annular frame 31 from the bottom end, the outer peripheral wall of the base 51 fits into the inner wall of the annular frame 31, and the upper surface of the locking teeth 35 is hooked on the edge of the lower surface of the base 51, so that the holder 5 cannot slip out below the outer frame 3.

[0077] As shown in Figures 2, 3 and 13, the filter sheet 4 is a smooth convex sheet located below the spokes 32 and the sealing lip 33 and fixed between the outer frame 3 and the holder 5. In the natural state, it covers the entire upper opening of the annular frame 31, and its upper and side surfaces fit the inner wall of the outer frame 3 to keep the filter sheet 4 and the outer frame 3 in a sealed state. The convex structure of the filter sheet 4 significantly increases its ventilation area, improving the breathability and comfort of the nasal filter 1. As shown in Figure 13, two concave-groove-shaped locking grooves 43 are further arranged vertically on both sides of the filter sheet 4, and the locking grooves 43 are fitted with two fixing rails 34 on the outer frame 3 to fix the filter sheet 4. The filter sheet 4 is an elastomer, which assists the filtering mechanism to achieve a one-way filtering function.

[0078] As shown in FIG. 13, the filter sheet 4 includes a filter layer body 41 and an elastic layer 42 arranged in a stacked manner. The filter layer body 41 has a single-layer structure and is used to filter suspended particulate matter, suspended droplets, scattered water droplets, or harmful gases in the air. As shown in FIG. 14, as an optimization, the filter layer body 41 has a double-layer structure arranged in a stacked manner, and includes a first filter layer body 411 and a second filter layer body 412 with different functions, the first filter layer body 411 and the second filter layer body 412 have the same shape and size, and are bonded together, the first filter layer body 411 adopts a medium-effect filter material (medium-effect filter material), and the second filter layer body 412 adopts an activated carbon filter material, and the combination of the two filter layers can simultaneously filter out suspended particulate matter and harmful gases. As a further optimization, the filter layer body 41 has a multi-layer structure arranged in a stacked manner, and the combination of multiple filter layers can meet higher filtration requirements.

[0079] As shown in FIG. 15, the elastic layer 42 is located below the filtration layer main body 41, the two are not adhered to each other, the shape and dimensions of the elastic layer 42 are the same as those of the filtration layer main body 41, and the elastic layer 42 has a mesh-like structure made of an elastic material, which improves the elasticity of the filter sheet 4 and assists the filtration mechanism to realize a one-way filtration function.

[0080] The filtering mechanism of this embodiment has a one-way filtering function, and as shown in Figs. 16, 17, and 18, the filter sheet 4 has one fixed part 44 and two openable / closable parts 45. The fixed part 44 is located at the center of the filter sheet 4. After assembly, the fixed part 44 is firmly sandwiched between the outer frame 3 located above it and the holder 5 located below it so as not to be displaced inside the outer frame 3. The openable / closable parts 45 are located at both side edges of the filter sheet 4 and are inclined downward in a direction away from the nasal passage axis 97. The inclination angle gradually increases, so that the openable / closable part 45 forms a downwardly inclined arc surface, improving the ventilation efficiency when the openable / closable part 45 is in an open state. The upper part of the openable / closable part 45 is restrained by the outer frame 3, but the lower part is not restrained by the holder 5. Therefore, when the openable / closable part 45 is in a closed state, when the openable / closable part 45 is urged downward from above, it can move downward and open from the closed position where it fits the lower surface of the spoke 32 and the seal lip 33.

[0081] As shown in Fig. 18, in the natural state and the inhalation state, the openable / closable part 45 is closed with its upper surface fitting to the lower surface of the spoke part 32 and the seal lip 33, maintaining a sealed state between the filter sheet 4 and the outer frame 3, the inhalation airflow passes through only the filter sheet 4, and the filtering mechanism performs a one-way filtering function. In the exhalation state, the openable / closable part 45 receives a large air pressure from above and moves downward to the position of the openable / closable part 45' in the open state, but at this time a gap is generated between the filter sheet 4 and the outer frame 3 through which most of the exhalation airflow passes, and the filtering mechanism does not perform a filtering function. When the exhalation state ends, the repulsive force of the filter sheet 4 causes the openable / closable part 45 to return to the closed state in the natural state.

[0082] The beneficial effect of the one-way filtration function is that the exhaled air flow no longer passes through the filter sheet 4, but directly through the gap between the filter sheet 4 and the outer frame 3, greatly reducing the exhalation resistance and thereby greatly improving the breathability and comfort of the nasal filter 1 in the exhalation state.

[0083] As shown in Figures 2, 3, 21A and 21B, the holder 5 is fitted into the cavity of the outer frame 3, and is located below the filter sheet 4, and includes one base 51, four side walls 52, three support beams 53, two snap buttons 54 and two fixing grooves 55, and the top surface of the holder 5 is a smooth convex surface.

[0084] As shown in Figures 21A, 21B, 22 and 23, the base 51 is located at the bottom of the holder 5 and has an annular structure. After assembly, the axis of the base 51 is parallel to the axis of the annular frame 31, and its outer peripheral wall closely meshes with the inner wall of the annular frame 31, and the interaction force between them fixes the holder 5 in the cavity of the outer frame 3. The cavity of the base 51 penetrates along the nasal passage axis 97, and the inhalation and exhalation airflows can smoothly pass through the cavity. The wall of the base 51 is thin to reduce the resistance to breathing.

[0085] As shown in Figures 21A, 21B and 22, the three support beams 53 are strip-shaped structures, and their outer shape is a trapezoid that opens downward. The three support beams 53 are located in the middle and upper part of the holder 5, specifically, the first support beam 531, the second support beam 532 and the third support beam 533, and both ends of the support beams 53 are connected to the upper surface of the top of the base 51, and together with the spokes 32, clamp and fix the fixing part 44 of the filter sheet 4 from below and above, respectively. As shown in Figures 10 and 22, the first spokes 321 and the first support beam 531, the second spokes 322 and the second support beam 532, and the third spokes 323 and the third support beam 533 clamp and fix the corresponding parts of the fixing part 44 one-to-one. As shown in Figure 24, as an optimization, the holder 5 further includes a fourth support beam 534, both ends of which are integrally connected to the center of the first support beam 531 and the center of the third support beam 533. In addition, the fourth support beam 534 intersects with the second support beam 532 and the intersections are fused together, and finally the four support beams 53 are fused into a lattice structure.

[0086] As shown in Fig. 21A, Fig. 21B and Fig. 22, the four side walls 52 are upright flat wall or arc-shaped wall structures, specifically, a first side wall 521, a second side wall 522, a third side wall 523 and a fourth side wall 524. The side walls 52 are located in the upper middle part of the holder 5, their lower ends are fixed to the base 51, their upper ends are located directly below the corresponding seal lips 33, and both sides are connected to the support beam 53. The side walls 52 and the seal lips 33 sandwich and fix the edge of the fixing part 44 of the filter sheet 4 from both the lower and upper directions. As shown in Fig. 10 and Fig. 22, the first seal lip 331 and the first side wall 521, the second seal lip 332 and the second side wall 522, the third seal lip 333 and the third side wall 523, and the fourth seal lip 334 and the fourth side wall 524 clamp and fix the edges of the fixing part 44 at the corresponding places.

[0087] 21A and 23, the two snap buttons 54 have an upright sheet-like structure, and are integrally connected to the underside of the front and rear ends of the base 51, respectively, with their bodies protruding downward from the underside of the base 51. The snap buttons 54 assist the wearer in removing the holder 5 from the outer frame 3. When removing the holder 5, the wearer simultaneously pulls the two snap buttons 54 in the direction of the nasal passage axis 97 to create gaps between the outer walls of the front and rear ends of the base 51 and the inner wall of the outer frame 3, thereby releasing the holder 5 from the constraints of the annular frame 31 and the two locking teeth 35, and allowing it to be smoothly removed.

[0088] As shown in FIGS. 21A and 21B, the two fixing grooves 55 are groove structures provided along the vertical direction on both sides of the second support beam 532, and the fixing grooves 55 fit into the fixing rails 34 to fix the holder 5.

[0089] 25, 26 and 27, two elastic carriers 56 are provided on the upper part of the holder 5 to assist the opening and closing part 45 in returning to the closed state. Each elastic carrier 56 includes one elastic strip 561 and one carrier strip 562. The elastic strip 561 is an arc-shaped strip made of an elastic material, and one end of each of the two elastic strips 561 is integrally connected to the outside of the first spoke 321 and the third spoke 323, respectively, and the main body extends in a direction away from the nasal passage axis 97 from the fixed point, and the other end is not fixed. The carrier strip 562 is a linear strip-like body arranged laterally, and intersects with the elastic strip 561 and is integrally connected to the intersecting point. After assembly, as shown in Figure 27, the elastic carrier 56 is positioned below the openable / closable part 45, with its upper surface fitting into the lower surface of the openable / closable part 45, and upon exhalation, the openable / closable part 45 is pushed by the exhaled airflow and urged into an open state, bending the elastic carrier 56 downward, and after exhalation ends, the repulsive force of the elastic carrier 56 encourages the openable / closable part 45 to return to the closed state more quickly.

[0090] As shown in Figures 28, 29 and 30, the filtering mechanism further includes a block-shaped filter body 7, and the filter bodies 7 of the two filtering mechanisms are arranged symmetrically. The filter body 7 is made of elastomer filtering material, which is used to enhance the filtering ability of the filtering mechanism. As shown in Figure 29, during assembly, the filter body 7 is inserted into the middle and lower part of the cavity of the holder 5 from the lower opening of the base 51. After assembly, the filter body 7 is fixed in the cavity surrounded by the base 51, the side wall 52 and the support beam 53. Here, the support beam 53 is located above and outside the filter body 7, the side wall 52 is located outside the filter body 7, the base 51 is located below the filter body 7, and both the front and rear ends of the base 51 are hooked on the filter body 7 from below, so that it is difficult to be removed from the holder 5. As an elastomer, the filter body 7 also contributes to realizing the one-way filtering function of the filtering mechanism. After assembly, the filter body 7 is located below the filter sheet 4. During exhalation, the openable part 45 opens downward, pressing the upper surface of the filter body 7 to elastically deform the filter body 7. After exhalation is completed, the repulsive force prompts the filter body 7 to return to its original state, and at the same time assists the openable part 45 to return to its closed state promptly. As shown in FIG. 30, four block-shaped fixed teeth 57 are integrally provided on the inner wall of the lower end of the base 51, and one side surface of the fixed teeth 57 is integrally connected to the inner wall of the base 51, and the main body protrudes from the inner wall of the base 51 in the axial direction of the base 51. After the elastic filter body 7 is assembled at a predetermined location, the fixed teeth 57 are caught by the filter body 7 from below, making it difficult to come off the holder 5. As a further optimization, the filter body 7 can be a stacked multi-layer structure, including filtration layers with different functions, each layer adopting filtration materials with different efficiencies or different filtering goals, and the combination of multiple filtering layers can meet higher filtering requirements.

[0091] As shown in Figures 31, 32, 33 and 34, the filtering mechanism further includes an openable and closable waterproof plug 6, and the waterproof plugs 6 of the two filtering mechanisms are arranged symmetrically. When the wearer is engaged in underwater activities such as swimming or diving, the waterproof plugs 6 are brought to a closed state capable of blocking the inflow of water into the nasal passages 95, and when the wearer stops the underwater activity, the waterproof plugs 6 are brought to an open state allowing normal breathing through the nose.

[0092] As shown in FIGS. 32 and 36A, the waterproof plug 6 includes one plug body 61, one skirt 62, one receiving plug 63, one receiving slot 64, and one connecting band 65. The plug 61 has a flat columnar structure, and the cross-sectional shape and dimensions of its top are the same as those of the cross-sectional shape and dimensions of the cavity at the lower end of the base 51. As shown in Fig. 33, to close the waterproof plug 6, the wearer inserts the plug 61 from below to above the lower end of the base 51, and when the plug 61 is fixed to the lower part of the base 51 by utilizing the frictional force generated by the engagement of the two, the plug 61 completely blocks the lower end opening of the holder 5, and water does not enter the nasal passage 95. When the wearer removes the plug 61 from the holder 5, the waterproof plug 6 is in the open state, and the wearer can breathe normally.

[0093] As shown in Figures 32 and 36A, the skirt 62 has an interrupted annular structure, surrounds the lower part of the plug 61, and is integrally connected to the plug 61. When the waterproof plug 6 is in a closed state, the skirt 62 gets caught under the base 51, preventing the plug 61 from penetrating too deeply into the cavity of the holder 5 and making it difficult to remove. The skirt 62 can also enhance the sealing effect of the joint between the waterproof plug 6 and the base 51.

[0094] As shown in FIG. 32 and FIG. 36A, the connection band 65 has a band-like structure, one end of which is integrally connected to the waterproof plug 6, and the other end of which is integrally connected to the holder 5.

[0095] As shown in Figures 32, 36A and 36B, one waterproof plug 6 is integrally formed with a columnar accommodating plug 63 that protrudes from its underside, and the other waterproof plug 6, which is arranged symmetrically to the first waterproof plug 6, is integrally formed with a cylindrical accommodating slot 64 that protrudes from its underside, and when the two waterproof plugs 6 are in the open state, the accommodating plug 63 on one waterproof plug 6 is inserted into and fits into the accommodating slot 64 on the other waterproof plug, and the friction between them connects the two waterproof plugs 6 below the nasal septum 91, preventing the waterproof plugs 6 from vibrating and causing discomfort to the wearer.

[0096] The nasal filter 1 provided with the waterproof plug 6 is for waterproofing, and the filter layer body 41 of the filter sheet 4 that fits therewith is usually a wire mesh or polyester fiber mesh with a pore size of 10 μm to 200 μm. The specific usage method is that when the wearer is doing surface sports such as surfing or rowing, the wearer opens the waterproof plug 6, and the wearer can breathe normally. When water drops spill into the nasal passage 95, the filter sheet 4 can block the water drops from the nasal passage 95 by the surface tension of the water so that they do not induce rhinitis or sinusitis after entering the nasal passage 95, and when the water drops fall from the filter sheet 4, the wearer can resume normal breathing. When the wearer is doing underwater sports such as swimming or diving, the wearer closes the waterproof plug 6 to prevent water from flowing into the nasal passage 95. Compared with the conventional swimming nose clip, the nasal filter 1 of the present invention is applicable to various water activities and has the advantages of not damaging the skin on the outside of the nose and having small swimming resistance.

[0097] Example 2 Figures 37, 38, 39, 40, 41 and 42 show a second embodiment of the present invention. The basic configuration of the filtration mechanism of this embodiment is similar to that of the first embodiment, but the difference is that the filtration mechanism of this embodiment uses a sawtooth filter sheet, and the ventilation area of ​​the filtration mechanism is further increased.

[0098] 37, the nasal filter 1 includes one connecting beam 2 and two filtering mechanisms. Both ends of the connecting beam 2 are integrally connected to two filtering mechanisms symmetrically disposed in the nasal passages 95 on both sides, respectively.

[0099] 37, the connecting beam 2 is a U-shaped structure including a middle portion 21 located below the nasal septum 91 and two connecting arms 22 located on either side of the nasal septum 91. The middle portion 21 is located between the two connecting arms 22.

[0100] As shown in FIG. 37, two filtering mechanisms are symmetrically connected to a connecting beam 2 , and each filtering mechanism comprises one outer frame 3 , one filter sheet 4 and one holder 5 . 38 and 39 , the outer frame 3 includes one annular frame 31, six spokes 32, twelve seal lips 33, two fixing rails 34, and two locking teeth 35. The annular frame 31 constitutes the side wall of the outer frame 3, and the spokes 32 and the seal lips 33 form the top of the outer frame 3.

[0101] As shown in Figures 38 and 39, the annular frame 31 is a hollow annular structure with both ends open, and its outer shape is an irregular trapezoid smaller at the top and larger at the bottom, and the top end of the annular frame 31 is sawtooth-shaped. When worn, the axis of the annular frame 31 is parallel to the nasal passage axis 97, and the outer peripheral wall of the annular frame 31 fits or closely meshes with the inner wall 96 of the nasal passage, and the interaction force between the two fixes the nasal filter 1 in the nasal passage 95. The cavity of the annular frame 31 penetrates along the nasal passage axis 97, allowing the inhalation and exhalation airflows to pass smoothly through the cavity of the annular frame 31. The wall of the annular frame 31 is thin to reduce resistance to breathing.

[0102] 38 and 39, the six spokes 32 and the twelve sealing lips 33 together constitute the top of the outer frame 3, which has a sawtooth structure and matches the filter sheet 4 of the same shape below, making the filtering area of ​​the filtering mechanism larger than that of a filtering mechanism in which the outer frame 3 has a flat top (flat top) or a convex top, thereby improving the breathability and comfort of the nasal filter 1. Both ends of the six spokes 32 are joined to different positions on the inner wall of the upper part of the annular frame 31, and the first spoke 321, the second spoke 322, the third spoke 323, the fourth spoke 324 and the fifth spoke 325 are linear stripe structures arranged parallel to each other and match the bent parts of the sawtooth structure on the top of the outer frame 3. The first spoke 321, the third spoke 323 and the fifth spoke 325 are located at a higher position, the second spoke 322 and the fourth spoke 324 are located at a lower position, and the sixth spoke 326 has a zigzag stripe structure that intersects with the above five spokes and is integrally connected at the intersections to form a lattice structure.

[0103] As shown in Figures 38 and 39, twelve straight or arcuate strip-shaped sealing lips 33 are arranged along the top edge of the annular frame 31, the outer side of the sealing lip 33 is integrally connected to the top of the annular frame 31, its main body protrudes from the inner wall of the annular frame 31 in the axial direction of the annular frame 31, and both ends of the sealing lip 33 are integrally connected to the root portions of the spokes 32, completely covering the contact portion between the filter sheet 4 and the annular frame 31.

[0104] 38 and 39, two fixed rails 34 are provided on both sides of a vertically-placed triangular prism-shaped annular frame 31, one side of which is integrally joined to the inner wall of the annular frame 31, forming a triangular prism-shaped structure with its main body protruding from the inner wall of the annular frame 31 in the axial direction of the annular frame 31. An arc-shaped (bow-shaped) chamfer is provided at the bottom of the fixed rail 34 to facilitate attachment of the filter sheet 4 and holder 5. As shown in Figure 39, two locking teeth 35 having an arc-shaped strip structure are horizontally arranged on the inner walls of both the front and rear ends near the lower end of the annular frame 31, one side surface of the locking teeth 35 is integrally connected to the inner wall of the annular frame 31, and its main body protrudes from the inner wall of the annular frame 31 in the axial direction of the annular frame 31 to form an arc-shaped strip structure.

[0105] As shown in Fig. 40, the filter sheet 4 is a sawtooth sheet-like object, the shape of which matches the underside of the top of the outer frame 3, the filter sheet 4 is located below the spokes 32 and the sealing lip 33, and is fixed between the outer frame 3 and the holder 5, in a natural state, the filter sheet 4 covers the entire upper opening of the annular frame 31, and its upper and side surfaces fit the inner wall of the outer frame 3, keeping the filter sheet 4 and the outer frame 3 in a sealed state. Compared with the flat and convex structures, the sawtooth structure of the filter sheet 4 significantly increases the ventilation area of ​​the filter sheet 4, improving the breathability and comfort of the nasal filter 1. The filter sheet 4 only includes a filter layer body 41, which has a single-layer structure and is used to filter suspended particulate matter, suspension droplets, scattered water droplets, or harmful gases in the air. Two recessed locking grooves 43 are further arranged vertically on both sides of the filter sheet 4, and the locking grooves 43 fit into two fixing rails 34 on the outer frame 3 to fix the filter sheet 4. The filter sheet 4 is made of an elastomer, and assists the filtering mechanism to achieve a one-way filtering function.

[0106] The filtering mechanism of this embodiment has a one-way filtering function, and as shown in Fig. 40, the filter sheet 4 includes one fixed part 44 and two openable / closable parts 45. The fixed part 44 is a W-shaped sheet-like object located in the center of the filter sheet 4. After assembly, the fixed part 44 is firmly sandwiched between the outer frame 3 located above it and the holder 5 located below it so as not to be displaced inside the outer frame 3. The openable / closable parts 45 are located on both edges of the filter sheet 4 and are inclined downward in a direction away from the nasal passage axis 97. The inclination angle gradually increases, so that the openable / closable part 45 presents a downwardly inclined arc surface, improving the ventilation efficiency when the openable / closable part 45 is open. The upper part of the openable / closable part 45 is restrained by the outer frame 3, but the lower part is not restrained by the holder 5. Therefore, when the openable / closable part 45 is in the closed state, when the openable / closable part 45 is urged downward from above, the openable / closable part 45 can move downward and open from the closed position where it fits against the lower surface of the spokes 32 and the seal lip 33. In the natural state and the inhalation state, the upper surface of the openable / closable part 45 fits against the lower surface of the spokes 32 and the seal lip 33, the gap between the filter sheet 4 and the outer frame 3 is kept sealed, the inhalation airflow passes through only the filter sheet 4, and the filtering mechanism performs the filtering function. In the exhalation state, the openable / closable part 45 receives a large air pressure from above and moves downward to an open state, but at this time, a gap is generated between the filter sheet 4 and the outer frame 3 through which most of the exhalation airflow passes, and the filtering mechanism does not perform the filtering function. When the exhalation state ends, the openable / closable part 45 returns to the closed state in the natural state due to the repulsive force of the filter sheet 4.

[0107] 37 and 41, the holder 5 is fitted into the cavity of the outer frame 3 and is located below the filter sheet 4, and the holder 5 includes one base 51, eight side walls 52, six support beams 53, two snap buttons 54, and two fixing grooves 55. The top surface of the holder 5 is a sawtooth surface. As shown in Fig. 41, the base 51 is located at the bottom of the holder 5 and has an annular structure. After assembly, the axis of the base 51 is parallel to the axis of the annular frame 31, and the outer peripheral wall of the base 51 closely meshes with the inner wall of the annular frame 31, and the interaction force between them fixes the holder 5 to the middle and lower part of the cavity of the outer frame 3. The cavity of the base 51 penetrates along the nasal passage axis 97, and the inhalation and exhalation airflows can smoothly pass through the cavity. The wall of the base 51 is thin to reduce the resistance to breathing.

[0108] 41, the support beam 53 is located in the upper center of the holder 5, and the first support beam 531, the second support beam 532, the third support beam 533, the fourth support beam 534, and the fifth support beam 535 are trapezoidal strip structures whose outer shape opens downward, and both ends of the five support beams 53 are integrally connected to the upper surface of the base 51. The sixth support beam 536 is a folded strip structure whose both ends are integrally connected to the center of the first support beam 531 and the center of the fifth support beam 535, and the sixth support beam 536 intersects with the second support beam 532, the third support beam 533, and the fourth support beam 534, and are integrally connected at the intersections to form a lattice structure. The spokes 32 and the support beam 53 each clamp and fix the fixed portion 44 of the filter sheet 4 from two directions, above and below, and as shown in Figures 39 and 41, the first spoke 321 and the first support beam 531, the second spoke 322 and the second support beam 532, the third spoke 323 and the third support beam 533, the fourth spoke 324 and the fourth support beam 534, the fifth spoke 325 and the fifth support beam 535, and the sixth spoke 326 and the sixth support beam 536 each clamp and fix the corresponding portions of the fixed portion 44 one-to-one.

[0109] 41, the eight side walls 52 are upright flat plate walls or arched plate wall structures located in the upper center portion of the holder 5, with the bottom ends of the side walls 52 fixed to the base 51 and the upper ends located directly below the corresponding sealing lips 33, with both sides connected to the support beams 53. The sealing lips 33 and the side walls 52 clamp and fix the edges of the fixing portion 44 of the filter sheet 4 from above and below, respectively.

[0110] 41, the two snap buttons 54 each have an upright sheet-like structure and are integrally connected to the underside of the front and rear ends of the base 51, respectively, with their bodies protruding downward from the underside of the base 51. The snap buttons 54 assist the wearer in removing the holder 5 from the outer frame 3. When removing the holder 5, the wearer simultaneously pulls the two snap buttons 54 in the direction of the nasal passage axis 97 to create a gap between the outer walls of the front and rear ends of the base 51 and the inner wall of the outer frame 3, thereby releasing the holder 5 from the constraints of the annular frame 31 and the two locking teeth 35 and allowing it to be smoothly removed.

[0111] As shown in FIG. 41, the two fixing grooves 55 are groove-like structures provided vertically on both sides of the third support beam 533, and the fixing grooves 55 are fitted with the fixing rails 34 to fix the holder 5. 42, in order to prevent the inner wall 96 of the nasal passage from being pierced by the sharp point on the top of the annular frame 31, an annular protective cover 36 is further fitted onto the outer periphery of the outer frame 3. The protective cover 36 surrounds the upper part of the outer frame 3 from the outside, and its lower end is connected to the upper end of the annular frame 31. The tip of the protective cover 36 is not lower than the highest point of the annular frame 31.

[0112] As will be explained at the end, the above embodiments are for illustrating the technical solution of the present invention, but are not intended to be limiting. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art will understand that any modifications or equivalent replacements made to the technical solution of the present invention will not depart from the spirit and scope of the technical solution of the present invention, and all of them should be included in the scope of the claims of the present invention. The claims as originally filed were as follows: [Claim 1] 1. A nasal filter comprising: The nasal filter (1) is disposed in the nasal passage, and the nasal filter (1) comprises one connecting beam (2) and two filtering mechanisms, and both ends of the connecting beam (2) are integrally or detachably connected to two filtering mechanisms symmetrically disposed in the bilateral nasal passages (95); The connecting beam (2) semi-encircles the lower end of the nasal septum (91), and the connecting beam (2) includes an intermediate portion (21) located below the nasal septum (91) and two connecting arms (22) symmetrically arranged on both sides of the nasal septum (91), the intermediate portion (21) is located between the two connecting arms (22), and the two connecting arms (22) are connected to two filtering mechanisms symmetrically arranged in the two nasal passages (95); The filtering mechanism includes an outer frame (3), a filter sheet (4), and a holder (5); The outer frame (3) includes an annular frame (31) and at least one spoke (32), the annular frame (31) is a hollow annular, elliptical cylindrical or tubular structure with both ends open, the annular frame (31) constitutes the side wall of the outer frame (3), when mounted, the axis of the annular frame (31) is parallel to the nasal passage axis (97), the outer peripheral wall of the annular frame (31) fits into the inner wall (96) of the nasal passage, and the cavity of the annular frame (31) penetrates along the nasal passage axis (97), the spoke (32) is a strip-like structure, both ends of which are integrally or detachably connected to the top of the annular frame (31), the spoke (32) constitutes the top of the outer frame (3), A sheet-like filter sheet (4) is provided below the top of the outer frame (3). Specifically, the filter sheet (4) is located below the spokes (32) and covers all of the upper openings of the annular frame (31). The filter sheet (4) has one fixed portion (44) and at least one openable / closable portion (45). The fixed portion (44) is located in the center of the filter sheet (4), the openable / closable portion (45) is located on the edge of the filter sheet (4), and the lower portion of the openable / closable portion (45) is not restricted by the holder (5). Therefore, in the exhalation state, the exhaled airflow presses the openable / closable portion (45) to switch the openable / closable portion (45) from a closed state to an open state, that is, the filtering mechanism has a one-way filtering function. A nasal filter characterized in that a holder (5) is fitted into a cavity of an outer frame (3), the holder (5) is located below a filter sheet (4), and the outer frame (3) and the holder (5) restrain and / or fix the filter sheet (4) from above and below. [Claim 2] The nasal filter according to claim 1, characterized in that the outer frame (3) further includes a sealing lip (33), the sealing lip (33) being a straight, bent or arcuate strip-like structure and arranged along the tip edge of the annular frame (31), the sealing lip (33) being integrally connected to the top of the annular frame (31), the main body of the sealing lip (33) protruding from the inner wall of the annular frame (31) in the axial direction of the annular frame (31), and both ends of the sealing lip (33) being integrally connected to the root portions of the spokes (32). [Claim 3] The nasal filter according to claim 1, characterized in that at least one fixing rail (34) is arranged vertically inside the outer frame (3), the fixing rail (34) is a rectangular column or semi-cylinder having an axis parallel to the axis of the annular frame (31), one side surface of the fixing rail (34) is integrally connected to the inner wall of the annular frame (31), and its main body protrudes from the inner wall of the annular frame (31) in the axial direction of the annular frame (31), and correspondingly and matchingly, groove-shaped engagement grooves (43) are provided on both sides of the filter sheet (4) along the vertical direction, and groove-shaped fixing grooves (55) are provided on both sides of the holder (5) along the vertical direction. [Claim 4] The nasal filter according to claim 1, characterized in that the outer frame (3) further comprises at least one strip-shaped or block-shaped locking tooth (35), the locking tooth (35) being provided on an inner wall near the lower end of the annular frame (31), one side of the locking tooth (35) being integrally connected to the inner wall of the annular frame (31), and a main body of the locking tooth (35) protruding from the inner wall of the annular frame (31) in the axial direction of the annular frame (31). [Claim 5] 2. The nasal filter according to claim 1, characterized in that the filter sheet (4) is an elastomer. [Claim 6] 2. The nasal filter according to claim 1, wherein the filter sheet (4) includes one filtering layer body (41) and one elastic layer (42) stacked on the filtering layer body (41). [Claim 7] 7. The nasal filter according to claim 6, characterized in that the filtering layer body (41) is a stacked multi-layer structure including a plurality of layer structures made of filtering materials having different filtering functions or filtering efficiencies. [Claim 8] 2. The nasal filter according to claim 1, wherein the filter sheet (4) is a sheet body having a convex surface or a sawtooth surface. [Claim 9] 2. The nasal filter according to claim 1, wherein the openable / closable portion (45) is inclined downward in a direction away from the nasal passage axis (97). [Claim 10] 10. The nasal filter according to claim 9, wherein the openable / closable portion (45) is inclined downward at an angle that gradually increases in a direction away from the nasal passage axis (97). [Claim 11] The holder (5) comprises a base (51) and at least one support beam (53); The base (51) is a hollow annular, elliptical cylindrical or tubular structure with both ends open, and is located in the middle and lower part of the holder (5). After assembly, the axis of the base (51) is parallel to the axis of the annular frame (31), its outer peripheral wall is tightly engaged with the inner wall of the annular frame (31), and the cavity of the base (51) penetrates along the nasal passage axis (97); The nasal filter according to claim 1, characterized in that the support beam (53) has a strip-like structure, and its outer shape is straight, broken, arc-shaped, arch-shaped, rectangular with a downward opening, or trapezoidal with a downward opening, the support beam (53) is located in the middle upper part of the holder (5), both ends of the support beam (53) are connected to the top of the base (51) or other remaining support beams, and clamps and fixes the fixed portion (44) of the filter sheet (4) from both below and above together with the spokes (32), and no support beam (53) is provided below the openable portion (45). [Claim 12] The holder (5) further comprises at least one side wall (52); The nasal filter according to claim 11, characterized in that the side wall (52) is an upright flat wall or an arc-shaped plate wall structure, located in the middle upper part of the holder (5), the lower end of the side wall (52) is fixed to the base (51), the tip is located directly below the corresponding sealing lip (33), and both sides are connected to the support beam (53), and the side wall (52) and the sealing lip (33) clamp and fix the edge of the fixing portion (44) of the filter sheet (4) from two directions, namely below and above. [Claim 13] The holder (5) further comprises at least one snap button (54); The nasal filter of claim 11, characterized in that the snap button (54) is an upright strip-like or sheet-like structure, the upper end of which is integrally connected to the edge of the lower surface of the base (51), and the main body of which protrudes downward from the lower surface of the base (51). [Claim 14] The nasal filter according to claim 11, characterized in that at least one elastic carrier (56) is further provided on the holder (5), the elastic carrier (56) including at least one elastic strip (561) and at least one selectable carrier strip (562), one end of the elastic strip (561) is integrally or detachably fixed to the support beam (53), its main body extends from the fixed point in a direction away from the nasal passage axis (97), and the other end is not fixed, the carrier strip (562) is a horizontal strip-like object fixed to the elastic strip (561), and after assembly, the elastic carrier (56) is located below the openable portion (45) and its upper surface fits or is adjacent to the lower surface of the openable portion (45). [Claim 15] 2. The nasal filter according to claim 1, characterized in that the filtering mechanism further includes one filter body (7), and after assembly, the filter body (7) is placed in the cavity of the holder (5). [Claim 16] 16. The nasal filter according to claim 15, characterized in that the filter body (7) is an elastomer. [Claim 17] 16. The nasal filter according to claim 15, characterized in that the filter body (7) is a stacked multi-layer structure including a plurality of layer structures made of filtering materials having different filtering functions or filtering efficiencies. [Claim 18] The filtering mechanism further includes a waterproof plug (6), The waterproof plug (6) includes one plug body (61), at least one skirt (62), and at least one connection band (65), The nasal filter of claim 1, characterized in that the plug (61) has a columnar structure, the cross-sectional shape and dimensions of its top are the same as the cross-sectional shape and dimensions of the cavity at the lower end of the holder (5) or the annular frame (31), and the plug (61) can be packed into the lower end of the holder (5) or the annular frame (31) to seal it; the skirt (62) has an annular structure or an intermittent annular structure, surrounds the lower part of the plug (61) and is integrally connected to the plug (61); and the connecting band (65) has a band-like structure, one end of which is integrally or detachably connected to the waterproof plug (6), and the other end of which is integrally or detachably connected to the connecting beam (2), the outer frame (3) or the holder (5). [Claim 19] Each of the two filtering mechanisms includes a waterproof plug (6), one of the waterproof plugs (6) is integrally provided with at least one columnar receiving plug (63) protruding from its underside, and the other waterproof plug (6) is integrally provided with at least one tubular receiving slot (64) protruding from its underside, the receiving plug (63) and the receiving slot (64) are paired and matched with each other; The nasal filter according to claim 18, characterized in that, when the two waterproof plugs (6) are both in an open state, the two waterproof plugs (6) are arranged opposite each other, the receiving plug (63) of one waterproof plug (6) is inserted into the receiving slot (64) of the other waterproof plug (6), and the two are tightly interlocked, and the frictional force between the two is utilized to connect the two oppositely arranged waterproof plugs (6) below the nasal septum (91). [Claim 20] The nasal filter according to claim 1, characterized in that the connecting beam (2) applies a clamping force to the nasal septum (91), the clamping force being applied directly to both sides of the nasal septum (91) by the two connecting arms (22) of the connecting beam (2) or the clamping force being conducted to a corresponding filtering mechanism by the two connecting arms (22) of the connecting beam (2) and then being applied to both sides of the nasal septum (91) by the corresponding filtering mechanism. [Explanation of symbols]

[0113] 1, nasal filter 2, connecting beam 3, Outer frame 4, Filter sheet 5, Holder 6, Waterproof plug 7, filter body 9, nose part 11, front of nose 12, back of nose 13. Above the nose 14. Below the nose 21, intermediate portion 22, connecting arm 31, Annular frame 32, Spoke 33, seal lip 34, fixed rail 35, locking teeth 36, protective cover 37, small spokes 41, filtration layer body 42, elastic layer 43, Locking groove 44, Fixed part 45, openable / closable portion 45', openable / closable portion in open state 51, base 52, side wall 53, support beam 54, snap button 55, fixing groove 56, elastic carrier 57, fixed teeth 61, plug body 62, skirt 63, receiving plug 64, receiving slot 65, connection band 91, nasal septum 92, nasal wings 93, nasal dorsum 94, nostrils 95, nasal passage 96, nasal passage inner wall 97, Nasal meatus axis 98, Nasal cavity 99, bottom of nose 321, 1st spoke 322, 2nd spoke 323, 3rd spoke 324, 4th spoke 325, 5th spoke 326, 6th spoke 331, first seal lip; 332, second seal lip 333, 3rd seal lip 334, 4th seal lip 335, 5th seal lip 336, 6th seal lip 411, 1st filtration layer body 412, 2nd filtration layer body 521, first side wall 522, second side wall 523, third side wall 524, fourth side wall 531, first support beam 532, second support beam 533, third support beam 534, fourth support beam 535, 5th support beam 536, 6th support beam 561, elastic strip 562, carrier strip

Claims

1. 1. A nasal filter comprising: two filtering mechanisms symmetrically disposed in the nasal passages on both sides to filter the inhaled air and to fix the nasal filter in the nasal passages; The filtering mechanism includes an outer frame and at least one filter sheet. The outer frame is a housing having a cavity opening at the top and bottom and extending therethrough, the outside of the housing fitting against the inner wall of the nasal passage at a location that restricts the passage of nasal respiratory airflow through the cavity; The filter sheets are disposed in cavities in the outer frame and are used to filter inhaled air, at least one of the filter sheets has a sheet-like structure, and the filter sheet of the sheet-like structure has a fixed part and an openable part, and in an inhalation state, the openable part is closed and the filter sheet completely closes the cavity of the outer frame, so that all of the inhaled airflow passes through the filter sheet, and in an exhalation state, the openable part is pushed downwards by the exhaled airflow and opens, so that an air passage that is not blocked by the filter sheet is formed, A nasal filter, wherein the filter sheet is a sheet body having a convex surface or a sawtooth surface.

2. The nasal filter of claim 1, further comprising at least one connecting beam that semi-encircles the lower end of the nasal passage wall and is integrally or removably connected to at least one filtering mechanism, the connecting beam being configured to prevent the nasal filter from being sucked deep into the nasal passage by a user.

3. The nasal filter of claim 2 , wherein the connecting beam applies a clamping force to a nasal passage wall.

4. The outer frame includes an annular frame and at least one spoke; The annular frame has a tubular structure having a cavity extending vertically therethrough, and constitutes a side wall main body of the outer frame; 2. The nasal filter of claim 1, wherein the spokes are strip-like structures, both ends of which are integrally or detachably connected to the annular frame, and the spokes laterally span a cavity in the annular frame to restrain or secure the filter sheet.

5. 5. The nasal filter of claim 4, wherein the outer frame further comprises at least one strip-shaped sealing lip, the sealing lip being configured to restrain or secure an edge of the filter sheet.

6. The nasal filter of claim 1 , wherein the filter sheet is an elastomer.

7. 7. The nasal filter according to claim 6, wherein the filter sheet includes a filtering layer body and an elastic layer stacked on the filtering layer body.

8. The nasal filter of claim 1 , wherein the filter sheet includes at least one filtration layer.

9. 1. A nasal filter comprising: two filtering mechanisms symmetrically disposed in the nasal passages on both sides to filter the inhaled air and to fix the nasal filter in the nasal passages; The filtering mechanism includes an outer frame and at least one filter sheet. The outer frame is a housing having a cavity opening at the top and bottom and extending therethrough, the outside of the housing fitting against the inner wall of the nasal passage at a location that restricts the passage of nasal respiratory airflow through the cavity; The filter sheets are disposed in cavities in the outer frame and are used to filter inhaled air, at least one of the filter sheets has a sheet-like structure, and the filter sheet of the sheet-like structure has a fixed part and an openable part, and in an inhalation state, the openable part is closed and the filter sheet completely closes the cavity of the outer frame, so that all of the inhaled airflow passes through the filter sheet, and in an exhalation state, the openable part is pushed downwards by the exhaled airflow and opens, so that an air passage that is not blocked by the filter sheet is formed, The filtering mechanism further includes a holder, the holder being provided in the cavity of the outer frame to restrain or fix the filter sheet; A nasal filter, characterized in that the holder, together with the outer frame, restrains or fixes the fixed portion of the filter sheet, and allows the openable / closable portion of the filter sheet to open downward to a desired position.

10. The holder comprises a base and at least one support beam; the base has an annular structure and is located under the holder to fix the holder; The nasal filter according to claim 9 , wherein the support beam is located in the middle upper part of the holder and restrains or fixes the fixing portion of the filter sheet.

11. The holder further comprises at least one side wall; The nasal filter according to claim 10, wherein the side wall is an upright flat wall or an arc-shaped plate wall structure, and is located in the upper middle part of the holder to fix the fixing part of the filter sheet.

12. The nasal filter according to claim 9, characterized in that the holder is further provided with at least one elastic carrier, the elastic carrier being configured to assist the openable / closable portion of the filter sheet in returning to a closed state.

13. 10. The nasal filter according to claim 9, wherein the filtering mechanism further comprises a filter body for filtering air, and after assembly, the filter body is placed in the holder.

14. 10. The nasal filter of claim 1 or claim 9, wherein the filtering mechanism further comprises a watertight plug configured to prevent water from entering and passing through the nasal filter.

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