Filter cotton cushion capable of being used for dust masks of various specifications

Abstract

The utility model discloses a filter cotton cushion capable of being used for dust masks of various specifications, which comprises a cotton cushion body, an annular base is arranged on one side of the cotton cushion body, an air hole penetrates through the center of the base, and a plurality of containing grooves are respectively arranged on the circumferential inner wall of the air hole at intervals. A movable piece capable of moving back and forth towards the center point of the air hole along the containing groove is arranged in each containing groove, a screwing groove capable of being screwed and clamped with a clamping block preset on the dustproof mask connector is formed in the head end, facing the center point of the air hole, of each movable piece, and an elastic piece capable of resetting the movable piece is arranged on the back of each movable piece. The utility model aims to provide a structural design of an expandable and contractible screwing groove and a filter cotton pad which is used for being screwed and clamped with interfaces with different specifications and diameters of a dust mask, so that the compatibility problem caused by non-uniform interface specifications of filter cotton pads of dust masks with various specifications is effectively solved; the replacement process of the filter cotton cushion is simplified, and the overall use experience is improved.

Description

Technical Field

[0001] The utility model relates to the field of dust mask accessories, in particular to a filter cotton pad that can be used for dust masks of various specifications. Background Art

[0002] A dust mask is an important personal protective equipment, which is widely used in various working environments to protect users from harmful particulate matter. A dust mask usually consists of a mask body, a filter cotton pad, an exhalation valve, a headband, etc., and can effectively filter pollutants in the air to provide a safe breathing environment. The mask body is usually made of soft silica gel or rubber, which can closely fit the face and provide good sealing performance. The exhalation valve is usually located in the front or below of the mask, and can quickly discharge the exhaust gas during exhalation, reduce the breathing resistance, and increase the wearing comfort. The headband is used to fix the mask, and usually adopts an adjustable design to adapt to the head sizes of different users. Among them, filter cotton pads are respectively arranged on the left and right sides outside the dust mask, mainly used to filter solid particulate matter in the air and prevent it from entering the respiratory tract of the user. The filter cotton pad usually adopts a detachable structural design for easy regular replacement. Common connection structures between the filter cotton pad and the dust mask include screw connection, adhesive connection, and rotary snap connection. The rotary snap connection method is to screw and fix the filter cotton pad on the snap block preset at the interface of the mask body through a snap groove, and during use, it can be quickly replaced by rotating in the reverse direction and then pulling. This design is simple and easy to use, ensuring quick replacement of the filter cotton pad.

[0003] However, the interfaces of the existing mask bodies for connecting the filter cotton pads usually have various specifications, while the interfaces of the filter cotton pads can only be applicable to dust masks with the same interface specifications. Although this design increases the diversity and pertinence of choices to a certain extent, it also brings some problems. First, different specifications of interfaces require users to pay special attention to the specification matching when replacing the filter cotton pad, otherwise it may cause the interface to be unable to connect or the connection to be insecure, affecting the protection effect. Second, different specifications of interfaces may cause troubles for users when purchasing replacement filter cotton pads, because there are various specifications in the market and they need to be carefully selected to find products suitable for their own masks. And this design increases the complexity of production and inventory management. Manufacturers need to produce and stock products of various specifications, increasing costs and management difficulties.

[0004] Therefore, the connection mechanism between the existing filter cotton pad and the dust mask needs to be further optimized and improved. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a filter cotton pad that can be used for dust masks of various specifications.

[0006] To achieve the above object, the present utility model adopts the following solution: A filter cotton pad that can be used for dust masks of various specifications, including a cotton pad body. There are circular holes on one surface of the cotton pad body. An annular base is provided along the circumference of the circular hole. A ventilation hole penetrates through the center of the base. A plurality of accommodating grooves are respectively and spacedly provided on the circumferential inner wall of the ventilation hole. An active member that can move back and forth along the accommodating groove towards the center point of the ventilation hole is provided in each accommodating groove. A screwing groove that can be screwed and clamped together with a preset clamping block on the interface of the dust mask is provided at the head end of the active member facing the center point of the ventilation hole. An elastic member that can push the active member to displace and reset towards the center point of the ventilation hole after the active member moves backward along the accommodating groove where it is located is provided on the back of the active member. Through this solution, a filter cotton pad can be suitable for dust masks of various specifications, which helps to reduce the trouble caused by interface mismatch when users replace the filter cotton pad. And through the flexibility of the active member, the firmness and tightness of the connection can be ensured.

[0007] As a preferred solution of the present utility model, guiding grooves are respectively provided on the left and right inner walls of the accommodating groove. The active member includes sliding seats whose left and right ends are respectively movably inserted into the corresponding guiding grooves. The screwing groove is fixed on the top of the sliding seat. The elastic member is arranged on the back of the sliding seat. This design ensures the stability of the active member. The guiding grooves provide an accurate path for the movement of the active member, avoiding possible misalignment problems during the connection process.

[0008] As a further solution of the present utility model, the screwing groove includes a groove body in the shape of "Γ". A convex point that can prevent the preset clamping block on the interface of the dust mask from rotating in the reverse direction by itself and thus disengaging from the groove body is provided at the notch of the groove body. This design increases safety, ensuring that the dust mask will not fall off due to the accidental rotation of the clamping block during use, thereby improving the reliability of use.

[0009] As a further solution of the present utility model, the top of the accommodating groove penetrates the top surface of the base. The top of the groove body extends out of the top of the accommodating groove. An arc-shaped baffle that extends along the circumference of the ventilation hole is provided on the back of the groove body where it extends out of the top of the accommodating groove. One end of the arc-shaped baffle extends to one side of an adjacent another groove body. And the adjacent arc-shaped baffles are connected end to end to enclose a circle. An extrusion block is provided on the arc-shaped baffle on one side of the notch of the groove body. An extrusion inclined surface is provided on the top surface of the extrusion block.

[0010] As a further solution of the present utility model, a retaining edge that extends towards the center of the ventilation hole is provided along the inner circumference of the arc-shaped baffle. There is a gap between one end of the retaining edge and the notch of the groove body that can allow the preset clamping block on the interface of the dust mask to pass through. The extrusion block is arranged in the gap.

[0011] The arc-shaped baffle and the extended eaves in the above solution provide additional fixing and sealing functions, ensuring that the filter cotton pad can be firmly fixed on the mask even in a high-intensity use environment. The notch at one end of the eaves ensures that there is enough space for the operation of the clamping block during the connection and separation process. At the same time, the presence of the extrusion block and the extrusion inclined surface enables the clamping blocks preset on the dust mask interfaces of different sizes and specifications to be smoothly snapped into the groove body for connection.

[0012] As a further solution of the present utility model, a splicing groove recessed inward is provided on the circumferential outer wall at one end of the arc-shaped baffle, and a splicing strip that can be spliced and snapped into the splicing groove is provided at one end of another arc-shaped baffle adjacent to the splicing groove.

[0013] As a further solution of the present utility model, an annular boss is provided along the circumferential inner wall of the ventilation hole. The annular boss is located below the opening of the accommodating groove. A sealing ring is provided on the annular boss, and the top surface of the sealing ring can be attached to the end surface of the dust mask interface. The design of the splicing groove and the splicing strip enables each arc-shaped baffle to be firmly connected together to form a complete annular structure, enhancing the overall structural strength.

[0014] As a preferred solution of the present utility model, the accommodating grooves are evenly distributed in a trisected manner on the circumferential inner wall of the ventilation hole, ensuring the uniform distribution of each accommodating groove and the moving part during force application, and avoiding problems of deformation and damage caused by uneven force.

[0015] As a preferred solution of the present utility model, the elastic member is an elastic strip extending obliquely. The end of the elastic strip abuts against the inner wall of the tail of the accommodating groove. The design of the obliquely extending elastic strip can provide a stable restoring force, ensuring that the moving part always stays in the correct position during use, and improving the connection firmness and stability of the filter cotton pad.

[0016] As a preferred solution of the present utility model, the cotton pad body includes a core composed of multiple layers of stacked meltblown cloth and / or cotton fiber. Breathable layers made of spunbonded cloth are respectively provided on the left and right sides of the core. The edges of the breathable layer and the core are pressure-welded together by ultrasonic welding. The round hole is provided in the center of one of the breathable layers. The base passes through the round hole and is fixed between the inner side of the breathable layer and the core, and the top surface of the base is connected to the inner side of the breathable layer.

[0017] In summary, the beneficial effects of the present utility model compared with the prior art are as follows: Through the structural design of the rotatable groove that can be expanded and reduced, and the rotatable snap connection with the interfaces of different specifications of dust masks, the present utility model provides a connection solution for filter cotton pads that can be applied to dust masks of various specifications, effectively solving the compatibility problem caused by inconsistent interface specifications. At the same time, it ensures the firmness and tightness of the connection, improving the convenience and safety of use. Specifically, the design of the movable part and the guiding groove ensures the stability and accuracy during the process of connecting the interfaces of dust masks of different sizes. The anti-reverse rotation design of the rotatable groove increases safety and prevents the filter cotton pad from accidentally falling off; the arc-shaped baffle and the extended eaves provide additional fixing and sealing functions, ensuring stability in high-intensity use environments; the notch on the eaves ensures sufficient operating space during the connection and separation processes; the design of the splicing groove and the splicing strip enhances the overall structural strength; the annular boss and the sealing ring provide sealing protection to prevent air leakage; the design of the obliquely extending elastic strip provides a stable restoring force to ensure that the movable part always remains in the correct position. Through these designs, the present utility model is not only applicable to dust masks of various specifications, but also provides a reliable protection effect during use, simplifies the maintenance and replacement processes, and improves the overall user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. is a perspective view of the present utility model installed on the mask body of a dust mask.

[0019] Figure 2 is Figure 1 an enlarged view of part A in

[0020] Figure 3 FIG. is a perspective view of the present utility model and an enlarged view of a partial area in the figure.

[0021] Figure 4 FIG. is one of the sectional views of the present utility model and an enlarged view of a partial area in the figure.

[0022] Figure 5 FIG. is the second sectional view of the present utility model and an enlarged view of a partial area in the figure.

[0023] Figure 6 FIG. is one of the exploded views of the present utility model and the interface of a dust mask.

[0024] Figure 7 FIG. is the second exploded view of the present utility model and the interface of a dust mask.

[0025] Figure 8 FIG. is one of the exploded views between the base and the movable part in the present utility model.

[0026] Figure 9 This is the second exploded view between the base and the movable part in the present utility model.

[0027] Figure 10 It is a schematic diagram showing that the preset block on the dust mask interface is inserted into the notch of the retaining edge and squeezes the extrusion block on the arc-shaped baffle, thereby causing the screwing groove to retreat.

[0028] Figure 11 It is a cross-sectional view after the preset block on the dust mask interface is rotated and inserted into the screwing groove.

[0029] Explanation of reference numerals: 1, cotton pad body; 2, base; 3, movable part; 4, elastic part; 5, sealing ring; 6, dust mask; 11, round hole; 12, inner core; 13, breathable layer; 21, ventilation hole; 22, accommodating groove; 23, guiding groove; 24, annular boss; 30, arc-shaped baffle; 31, screwing groove; 32, extrusion block; 33, retaining edge; 34, splicing groove; 35, splicing strip; 36, sliding seat; 61, interface; 62, block; 311, groove body; 312, bump; 321, extrusion inclined surface; 331, notch. Detailed implementation manners

[0030] The following specific implementation contents provide various different embodiments or examples for implementing the present utility model. Of course, these are only embodiments or examples and are not intended to be restrictive. Additionally, repeated reference numerals may be used in different embodiments, such as repeated numbers and / or letters. These repetitions are for the purpose of simply and clearly describing the present invention and do not represent a specific relationship between the different embodiments and / or structures discussed.

[0031] Furthermore, spatially relative terms may be used herein, such as "below", "lower side", "from inside to outside", "above", "upper side" and similar terms. These relational terms are for the purpose of facilitating the description of the relationship between some elements or features in the drawings and other elements or features. These spatial relational terms include different orientations of the device during use or operation, as well as the orientations described in the drawings. The device may be rotated 90 degrees or other orientations, and the spatially relative adjectives used may be interpreted accordingly. Therefore, it should not be construed as a limitation to the present invention. The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0032] The following further describes the present utility model in conjunction with the accompanying drawings and specific implementation manners: As Figures 1 to 11A filter cotton pad that can be used for dust masks of multiple specifications is shown. It includes a cotton pad body 1 composed of an inner core 12 and breathable layers 13 made of spunbonded cloth respectively arranged on the left and right sides of the inner core 12. The inner core 12 is composed of multiple layers of stacked meltblown cloth and / or cotton fibers. The edges of the breathable layer 13 and the inner core 12 are pressure-welded together by ultrasonic welding. A circular hole 11 penetrates through the center of the breathable layer 13 on one side. An annular base 2 is provided along the circumference of the circular hole 11. In this embodiment, the base 2 is made of plastic material. The base 2 passes through the circular hole 11 and is fixed between the inner side of the breathable layer 13 and the inner core 12, and the top surface of the base 2 is ultrasonically welded to the inner side of the breathable layer 13. A ventilation hole 21 penetrates through the center of the base 2 so that one side of the inner core 12 communicates with the interface 61 of the dust mask 6. A plurality of receiving grooves 22 are respectively arranged at intervals on the circumferential inner wall of the ventilation hole 21. In this embodiment, the receiving grooves 22 are evenly distributed in three equal parts on the circumferential inner wall of the ventilation hole 21, and each receiving groove 22 is in a rectangular hollow shape. The length direction of the receiving groove 22 is formed in the direction of the extension path from the central axis of the ventilation hole 21 to the outside of the base 2. It should be noted separately that please refer to Figures 3 to 5 , and Figures 8 to 11 the directions shown in, the top of the receiving groove 22 penetrates through the top surface of the base 2, that is to say, both the side of the receiving groove 22 facing the center of the ventilation hole 21 and its top are open. Symmetrically arranged guide grooves 23 are respectively provided on the left and right inner walls of the receiving groove 22, and both the front and rear ends of the guide grooves 23 are closed. An active part 3 that can move forward and backward along the guide groove 23 toward and away from the center point of the ventilation hole 21 is provided in each receiving groove 22. A screwing groove 31 that can be screwed and clamped with a preset clamping block 62 on the interface 61 of the dust mask 6 is provided at the head end of the active part 3 facing the center point of the ventilation hole 21. An elastic part 4 that can push the active part 3 to displace and reset toward the center point of the ventilation hole 21 after the active part 3 moves backward along the receiving groove 22 where it is located is provided on the back of the active part 3. When the three active parts 3 move backward along the guide grooves 23 where they are located and the elastic parts 4 are compressed, the distance between the screwing grooves 31 can be expanded to adapt to the interface 61 of the dust mask 6 with a larger diameter specification. On the contrary, when the three active parts 3 move toward the center of the ventilation hole 21 along the guide grooves 23 where they are located, the interface 61 of the dust mask 6 with a smaller diameter specification can be adapted. In this way, when the user purchases and replaces the filter cotton pad, there is no need to consider the specification size of the interface 61 of the dust mask 6, and the filter cotton pad can be replaced, solving the problem that the connection between the filter cotton pads of different specifications and the interface 61 of the dust mask 6 is not firm, affecting the protection effect. And this design also enables the manufacturer to not need to produce and stock filter cotton pad products of multiple specifications, reducing costs and management difficulties.

[0033] Specifically, as Figures 1 to 11As shown, the movable member 3 includes a sliding seat 36 with its left and right ends respectively movably inserted into corresponding guide grooves 23. The screwing groove 31 is fixed to the top of the sliding seat 36. The screwing groove 31 includes a groove body 311 in the shape of "Γ", and the top of the groove body 311 extends out of the top of the accommodating groove 22. At the notch of the groove body 311, there is a convex point 312 that can prevent the preset block 62 on the interface 61 of the dust mask 6 from rotating in the reverse direction by itself and then disengaging from the groove body 311. In this embodiment, the convex point 312 is in the shape of a raised triangle, and of course, it can also be other raised shapes, such as semi-circular. When the block 62 needs to be inserted into the groove body 311, since both the block 62 and the convex point 312 are formed of plastic, when the block 62 is subjected to the rotational external force applied by the user and presses against the convex point 312, it will cross over the convex point 312 and be inserted into the groove body 311. The protruding convex point 312 can prevent the block 62 from falling off due to accidental reverse rotation during the use of the dust mask 6. It should be noted here that the screwing groove 31 formed by the groove body 311 in the shape of "Γ" is an existing conventional screwing structure.

[0034] In order to ensure that the filter cotton pad does not wobble left and right when installed on the interface 61 of the dust mask 6, and to prevent dust from entering the inner core 12 between the ventilation holes 21 and the circumferential outer wall of the interface 61, an arc-shaped baffle 30 extending along the circumference of the ventilation hole 21 is provided on the back of the groove body 311 extending out of the top of the accommodating groove 22. One end of the arc-shaped baffle 30 extends to one side of an adjacent groove body 311, and the adjacent arc-shaped baffles 30 are connected end to end to form a circle. Along the inner circumference of the arc-shaped baffle 30, there is a retaining edge 33 extending towards the center of the ventilation hole 21, and the circumferential inner wall of the retaining edge 33 can fit on the circumferential outer wall of the interface 61. In addition, an annular boss 24 is provided along the circumferential inner wall of the ventilation hole 21, and the annular boss 24 is located below the opening of the accommodating groove 22. In this embodiment, the top surface of the annular boss 24 is flush with the bottom surface of the accommodating groove 22. A sealing ring 5 is provided on the annular boss 24, and the top surface of the sealing ring 5 can fit on the end surface of the dust mask interface 61, and the outer circumferential wall of the sealing ring 5 is attached to the circumferential inner wall of the ventilation hole 21, and the bottom of the groove body 311 moves on the top surface of the sealing ring 5.

[0035] In addition, as Figures 3 to 10 shown, in order to provide sufficient space for the block 62 to operate during the process of rotating connection and separation with the groove body 311, there is a notch 331 between one end of the retaining edge 33 and the notch of the groove body 311 that can allow the preset block on the dust mask interface to pass through. As Figure 10 and Figure 11As shown, when the interface 61 is inserted into the vent 21, the block 62 first enters the notch side of the slot body 311 from the notch 331, and then rotates to enter the slot body 311 from the notch of the slot body 311. It should be noted that in order to allow the block 62 on interfaces 61 of different sizes to be inserted into the screw-on slot 31 smoothly and more simply, an extrusion block 32 is provided on the arc-shaped baffle 30 located on the notch side of the slot body 311, that is, in the notch 331. The height of the extrusion block 32 is flush with the top of the slot body 311, and an extrusion slope 321 is provided at the top corner of the extrusion block 32 facing the center of the vent 21. In this way, when the block 62 on the interface 61 with a larger diameter is aligned with the notch 331 and inserted, the corner at the bottom of the block 62 will squeeze the corresponding extrusion slope 321, allowing the arc baffle 30 to move with the sliding seat 36 at the bottom of the groove body 311 along the guide groove 23 to the outside of the base 2, thereby expanding the circle enclosed by the entire arc baffle 30 so that the interface 61 can be inserted, and at the same time, the block 62 can be smoothly screwed into the corresponding groove body 311. It is worth noting that when the circle enclosed by the arc baffle 30 is expanding, a gap will be generated between one end of the arc baffle 30 and one end of another adjacent arc baffle 30, which will allow dust to enter the inner core 12 from the gap and be inhaled by the user, causing protection failure. In order to solve this problem, an inwardly concave splicing groove 34 is provided on the circumferential outer wall at one end of the arc baffle 30, and a splicing strip 35 that can be spliced ​​and inserted into the splicing groove 34 is provided at one end of the other arc baffle 30 adjacent to the splicing groove 34. When one end of the arc baffle 30 begins to move away from another end of the adjacent arc baffle 30, the extended splicing strip 35 will only gradually fit in with the side wall that fits in with the splicing groove 34, thereby preventing a gap from being generated between one end of the arc baffle 30 and another end of the adjacent arc baffle 30.

[0036] Finally, the elastic strip of the elastic member 4 in this embodiment is arranged on the back of the sliding seat 36 or the back of the arc-shaped baffle 30, and the end of the elastic strip abuts against the inner wall of the tail of the accommodating groove 22. Similarly, since the base 2 and the movable member 3 are made of plastic, the elastic strip in this embodiment is also made of plastic, and is integrally formed with the arc-shaped baffle 30, the sliding seat 36, the baffle 33, the groove body 311, the protrusion 312 and the extrusion block 32 by injection molding. Of course, the elastic member 4 can also be a spring or other elastic body of the same type.

[0037] The basic principles, main features and advantages of the present utility model have been shown and described above. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and all these changes and improvements fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A filter cotton pad that can be used for dust masks of various specifications, comprising a cotton pad body (1), a circular hole (11) being provided on one side surface of the cotton pad body (1), characterized in that: An annular base (2) is provided along the circumference of the circular hole (11). A ventilation hole (21) penetrates through the center of the base (2). A plurality of accommodation grooves (22) are respectively and spacedly provided on the circumferential inner wall of the ventilation hole (21). An active member (3) capable of moving back and forth along the accommodation groove (22) towards the center point of the ventilation hole (21) is provided in each accommodation groove (22). A screwing groove (31) capable of being screwed and clamped together with a preset clamping block on the dust mask interface is provided at the head end of the active member (3) facing the center point of the ventilation hole (21). An elastic member (4) capable of pushing the active member (3) to displace and reset towards the center point of the ventilation hole (21) after the active member (3) moves backward along the accommodation groove (22) where it is located is provided on the back of the active member (3).

2. A filter cotton pad that can be used for dust masks of various specifications according to claim 1, characterized in that: Guide grooves (23) are respectively provided on the left and right inner walls of the accommodation groove (22). The active member (3) includes a sliding seat (36) with its left and right ends respectively movably inserted into the corresponding guide grooves (23). The screwing groove (31) is fixed on the top of the sliding seat (36). The elastic member (4) is arranged on the back of the sliding seat (36).

3. The filter cotton pad that can be used for dust masks of various specifications according to claim 2 is characterized in that: The screwing groove (31) includes a groove body (311) in the shape of a "factory" character. A convex point (312) capable of preventing the preset clamping block on the dust mask interface from rotating in the reverse direction by itself and thus disengaging from the groove body (311) is provided at the notch of the groove body (311).

4. The filter cotton pad that can be used for dust masks of various specifications according to claim 3 is characterized in that: The top of the accommodation groove (22) penetrates through the top surface of the base (2). The top of the groove body (311) extends out of the top of the accommodation groove (22). An arc-shaped baffle (30) extending along the circumference of the ventilation hole (21) is provided on the back of the groove body (311) extending out of the top of the accommodation groove (22). One end of the arc-shaped baffle (30) extends to one side of the adjacent another groove body (311). And the adjacent arc-shaped baffles (30) are connected end to end to enclose a circle. An extrusion block (32) is provided on the arc-shaped baffle (30) on the notch side of the groove body (311). An extrusion inclined surface (321) is provided on the top surface of the extrusion block (32).

5. A filter cotton pad for dust masks of various specifications according to claim 4, characterized in that: A retaining edge (33) extending towards the center of the ventilation hole (21) is provided along the inner circumference of the arc-shaped baffle (30). There is a gap (331) between one end of the retaining edge (33) and the notch of the groove body (311) capable of allowing the preset clamping block on the dust mask interface to pass through. The extrusion block (32) is arranged in the gap (331).

6. A filter cotton pad for dust masks of various specifications according to claim 5, characterized in that: A splicing groove (34) recessed inward is provided on the circumferential outer wall at one end of the arc-shaped baffle (30). A splicing strip (35) capable of being spliced and inserted into the splicing groove (34) is provided at one end of another arc-shaped baffle (30) adjacent to the splicing groove (34).

7. A filter cotton pad for dust masks of various specifications according to claim 6, characterized in that: An annular boss (24) is provided along the circumferential inner wall of the ventilation hole (21). The annular boss (24) is located below the opening of the accommodation groove (22). A sealing ring (5) is provided on the annular boss (24). The top surface of the sealing ring (5) can be attached to the end surface of the dust mask interface.

8. The filter cotton pad for dust masks of various specifications according to claim 7, characterized in that: The accommodation grooves (22) are evenly distributed in a three-equal-part manner on the circumferential inner wall of the ventilation hole (21).

9. A filter cotton pad for dust masks of various specifications according to any one of claims 1 to 8, characterized in that: The elastic member (4) is an elastic strip extending obliquely, and the end of the elastic strip abuts against the inner wall of the rear portion of the accommodating groove (22).

10. A filter cotton pad for dust masks of various specifications according to claim 9, characterized in that: The cotton pad body (1) comprises an inner core (12) composed of multiple layers of meltblown fabric and / or cotton fibers stacked together, and air permeable layers (13) made of spunbond fabric are respectively provided on the left and right sides of the inner core (12). The edges of the air permeable layer (13) and the inner core (12) are pressurized and fused together by ultrasonic welding. The circular hole (11) is arranged in the center of the air permeable layer (13) on one side, and the base (2) passes through the circular hole (11) and is fixed between the inner side of the air permeable layer (13) and the inner core (12), and the top surface of the base (2) is connected to the inner side of the air permeable layer (13).

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