CN111713777B

CN111713777B - Mask

Info

Publication number: CN111713777B
Application number: CN202010568769.9A
Authority: CN
Inventors: 赵毅武; 范冬梅; 张良; 刘云; 余宗炜; 卢彦成; 董骧
Original assignee: Nantong Medical Protective Equipment Tianjin Co ltd; Beijing Naton Technology Group Co Ltd
Current assignee: Nantong Medical Protective Equipment Tianjin Co ltd; Beijing Naton Technology Group Co Ltd
Priority date: 2020-06-19
Filing date: 2020-06-19
Publication date: 2024-04-05
Anticipated expiration: 2040-06-19
Also published as: CN111713777A

Abstract

The invention discloses a mask, which comprises a mask body and a first folding piece, wherein the first folding piece is arranged on the inner side surface of the mask body and can be folded between a closed position and an open position, the first folding piece is provided with a first side surface, the first side surface is a curved surface and is provided with a first convex part, a second convex part and a concave part positioned between the first convex part and the second convex part, the concave part is in a shape of an arc shape which is concave towards the second side surface, the distance between the highest point of the first convex part and the highest point of the second convex part is 25.1887mm-68.734mm, and the shortest distance from the lowest point of the concave part to the highest point of the first convex part or the highest point of the second convex part in the width direction of the first folding piece is 2.4631mm-6.7213mm. The mask disclosed by the invention can be better matched with the nose shape of a human body, so that the fitting degree of the mask and the nose bridge is ensured, and the tightness and the protection performance of the mask are enhanced.

Description

Mask

Technical Field

The invention relates to the technical field of medical treatment and health, in particular to a mask.

Background

The mask is a sanitary protection tool for reducing or preventing harmful particles in the air, including germs, viruses, suspended particles, harmful gases and the like, from being sucked into the lung, ensures that a wearer sucks pure air to a certain extent, and is widely applied to the fields of labor protection and health care. Particularly in certain environments with high pollution levels, it has become necessary to wear masks that are effective for protection.

In order to ensure that the mask has good protection effect, the mask and the face are required to be well attached, otherwise, harmful gas easily enters the internal breathing space from the gap between the mask and the face, and is particularly easy to inhale from two sides of the nose bridge. In the related art, a concave part is arranged at a position of the mask corresponding to the nose bridge or a pressing bar is additionally arranged, but the fitting degree of the mask and the nose bridge is poor in the form of arranging the concave part; for the form of setting the layering, when the user exhales, the layering appears becoming flexible deformation easily, and the protectiveness of two kinds of structures just can not be guaranteed promptly.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the mask provided by the invention has the advantages of high fitting degree between the mask and the nose bridge and good sealing and protecting effects.

The mask according to the embodiment of the invention comprises a mask body; the first folding piece is arranged on the inner side face of the cover body and can be folded between a closed position and an open position, the first folding piece comprises a first side face and a second side face which are oppositely arranged in the width direction of the first folding piece, the first folding piece is attached to the inner side face of the cover body in the closed position, at least part of the first folding piece is far away from the inner side face of the cover body so that the first side face of the first folding piece faces inwards, the first side face of the cover body is a curved surface and is provided with a first convex part, a second convex part and a concave part located between the first convex part and the second convex part, the concave part is in an arc shape which is concave towards the second side face, and the distance between the highest point of the first convex part and the highest point of the second convex part is 25.1887mm-68.734mm.

According to the mask provided by the embodiment of the invention, the size range most suitable for the nose shape of the national person is obtained by carrying out a large number of face and nose shape measurement surveys and calculation on the face shape of the national person, so that the mask provided by the embodiment of the invention can be better attached to the nose bridge of the national person, and the tightness and the protection performance of the mask are enhanced.

In some embodiments, the shortest distance in the width direction of the first tab from the lowest point of the recess to the highest point of the first protrusion or the highest point of the second protrusion is 2.4631mm-6.7213mm.

In some embodiments, the distance between the highest point of the first protrusion and the highest point of the second protrusion is 40.1887mm-60.734mm; and/or the shortest distance from the lowest point of the concave part to the highest point of the first convex part or the highest point of the second convex part in the width direction of the first folded sheet is 4.4631mm-5.6213mm.

In some embodiments, the distance between the highest point of the first protrusion and the highest point of the second protrusion is 54.2mm; and/or the shortest distance in the width direction of the first tab from the lowest point of the concave portion to the highest point of the first convex portion or the highest point of the second convex portion is 5.3mm.

In some embodiments, the first protrusion and the second protrusion are arc segments, and the radius of the arc segment corresponding to the first protrusion and the radius of the arc segment corresponding to the second protrusion are both 15mm; and/or the concave part is an arc section, the radius of the arc section corresponding to the concave part is 60.19mm, and the two ends of the concave part are respectively tangent to the first convex part and the second convex part.

In some embodiments, the first convex portion, the second convex portion, and the concave portion therebetween are smoothly transitioned by a curve, and the curvature of the curve formed by the first convex portion, the concave portion, and the second convex portion is gradually increased by symmetrical axial sides of the first side surface.

In some embodiments, the recess between the first protrusion and the second protrusion includes a first arc segment, a second arc segment, and a third arc segment that are sequentially connected, where the first arc segment and the third arc segment each protrude in a direction toward the second side, and the second arc segment protrudes in a direction away from the second side.

In some embodiments, the first lobe, the first arc segment, the second arc segment, the third arc segment, and the second lobe are sequentially tangent.

In some embodiments, the radius of each of the first and third arc segments is 46.34mm, and/or the arc length of each of the first and third arc segments is 20.27mm; and/or the radius of the second arc section is 50mm, and/or the arc length of the second arc section is 2.69mm.

In some embodiments, the recess is a circular arc segment having a radius of 60.19mm, and both ends of the recess are tangent to the first and second protrusions, respectively.

In some embodiments, the first side of the first tab further has a first diagonal segment and a second diagonal segment, one end of the first diagonal segment is tangent to the first protrusion, the other end of the first diagonal segment is connected to the cover body through a first curved portion, one end of the second diagonal segment is tangent to the second protrusion, and the other end of the second diagonal segment is connected to the cover body through a second curved portion.

In some embodiments, the first and second diagonal segments are inclined at an angle of 15 °.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic view of a mask according to an embodiment of the present invention;

fig. 2 is a schematic view of a first flap of a mask in a closed position according to an embodiment of the present invention;

fig. 3 is an exemplary schematic view of a first flap of a mask according to an embodiment of the present invention;

fig. 4 is a schematic view of a mask body structure of the mask according to an embodiment of the present invention;

fig. 5 is another exemplary illustration of a first flap of a mask according to an embodiment of the present invention;

fig. 6 is yet another exemplary illustration of a first flap of a mask according to an embodiment of the present invention;

fig. 7 is a schematic view of a second flap of a mask in a closed position according to an embodiment of the present invention;

fig. 8 is a schematic view of a first tab of a mask according to an embodiment of the present invention, showing a slot width L and a slot depth H;

fig. 9 is a schematic view of a first flap of a mask according to an embodiment of the present invention, wherein arc lengths of a plurality of arc segments are shown.

Reference numerals:

the cover body (1) is provided with a plurality of grooves,

the first tab 2, the first side 21, the first protrusion 211, the second protrusion 212, the recess 213, the first arc segment 2131, the second arc segment 2132, the third arc segment 2133, the first diagonal segment 214, the second diagonal segment 215, the first curved portion 216, the second curved portion 217, the second side 22, the first body portion 23, the first folded portion 24,

the second flap 3, the second body portion 31, and the second fold 32.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

As shown in fig. 1 and 2, the mask according to the embodiment of the present invention includes a mask body 1 and a first tab 2. The mask body 1 is a main body part of the mask and plays a role in filtering air.

The first flap 2 includes a first side 21 (a lower side of the first flap 2 in fig. 1 and 2) and a second side 22 (an upper side of the first flap 2 in fig. 1 and 2) which are oppositely arranged in a width direction thereof (up-down direction as shown in fig. 1), and the first flap 2 is provided on an inner side of the cover 1 and is foldable between a closed position and an open position. The inner side surface of the cover 1 is a surface that contacts the face.

In the closed position, the first tab 2 is in abutment with the inner side of the cover 1, and in the open position, at least part of the first tab 2 is distanced from the inner side of the cover 1 so that the first side 21 of the first tab 2 is facing inwards. As shown in fig. 1, when the mask is used by a user, at least part of the first folding piece 2 can be folded inwards and upwards, so that the first folding piece 2 is positioned at the opening position, the lower side surface of the first folding piece 2 can face a human face and is convenient to be attached to the nose bridge, and the protective sealing function is achieved.

The first side surface 21 of the cover 1 is curved and has a first convex portion 211, a second convex portion 212, and a concave portion 213 located between the first convex portion 211 and the second convex portion 212, and the concave portion 213 is substantially arc-shaped concave toward the second side surface 22. The first side 21 is curved, so that the nose bridge can be better attached to the face, the first side 21 is provided with a first convex part 211, a second convex part 212 and a concave part 213, the concave part 213 is arranged between the first convex part 211 and the second convex part 212, and is in a shape of an arc which is concave towards the second side 22.

The distance (L shown in fig. 8) between the highest point of the first convex portion 211 and the highest point of the second convex portion 212 is 25.1887mm-68.734mm, and the shortest distance (H shown in fig. 8) from the lowest point of the concave portion 213 to the highest point of the first convex portion 211 or the highest point of the second convex portion 212 in the width direction (up-down direction shown in fig. 2) of the first tab 2 is 2.4631mm-6.7213mm.

The inventor finds that the mask in the related art is generally used for eastern and western people, however, the noses of the eastern and western people are different, the eastern people use the general mask in the related art, and the nose bridge position has poor fitting degree with the mask and poor sealing property. Therefore, the inventor designs the mask through researching the nose shape of the eastern person, and the mask can be better attached to the nose bridge of the eastern person, so that the protection performance is enhanced.

Preferably, the distance between the highest point of the first protrusion 211 and the highest point of the second protrusion 212 (L shown in fig. 8) is 40.1887mm-60.734mm, and the shortest distance from the lowest point of the recess 213 to the highest point of the first protrusion 211 or the highest point of the second protrusion 212 (H shown in fig. 8) in the width direction of the first tab 2 is 4.4631mm-5.6213mm, which is a further improvement based on the range in the above-described embodiment, more fitting the nose shape of the eastern person.

Preferably, the groove width L is 54.2mm in size, the groove depth H is 5.3mm in size, the arc length (S shown in FIG. 9) of the concave portion 213 is 55.55mm, and the inventor has found that the sealing effect is good by setting the groove width L to 54.2mm in size, the groove depth H to 5.3mm in size, and the arc length S to 55.55mm in size, which is very close to the bridge of the nose of the eastern person.

Further, as shown in fig. 3, the first convex portion, the second convex portion and the concave portion therebetween are smoothly transited by a curve, and the curvature of the curve formed by the first convex portion, the concave portion and the second convex portion is gradually increased by symmetrical axial sides of the first side surface. According to the design, on one hand, the curve design is more fit with a face, sharp edges and corners are not generated, wearing comfort of a wearer is improved, on the other hand, the middle curve section of the concave part is fit with a nose bridge, the curve sections on two sides are fit with nose wings, the middle curve section does not need to be too large in bending amplitude, discomfort caused by concentrated stress of the nose tip due to the fact that the bottom of the concave groove is too close to the tip of the nose is avoided, the nose wings on two sides are required to be large in bending amplitude, grooves on two sides are sunken to be fit with the nose wings, and therefore the curvature change design is also used for further improving sealing effects of the nose bridge.

Of course, in other embodiments, the first protrusion 211, the second protrusion 212, and the concave portion therebetween may be formed by connecting short straight lines instead of smooth transition of curves, or may be formed by connecting curves and straight lines together, which are all within the protection scope of the mask, but the groove structure formed by the curves is more comfortable to wear and is the priority scheme of my.

The first convex part 211 and the second convex part 212 are arc sections, the radius of each arc section is 15mm, and the first convex part and the second convex part are arranged in such a way that the first convex part and the second convex part can be better attached to the two sides of the nose bridge, and the processing is convenient.

In some embodiments, as shown in fig. 3, the recess 213 includes a first arc segment 2131, a second arc segment 2132, and a third arc segment 2133 connected in sequence, wherein the first arc segment 2131 and the third arc segment 2133 each protrude in a direction toward the second side 22 (upward as shown in fig. 1), and the second arc segment 2132 protrudes in a direction away from the second side 22 (downward as shown in fig. 1).

Since the nose bridge is of a protruding structure, the recess is formed in an arc shape recessed toward the second side, and thus the first arc segment and the third arc segment are protruded downward as shown in fig. 1 in the above embodiment, and the second arc segment is disposed between the first arc segment and the third arc segment so as to be mainly in contact with the tip of the nose bridge. However, due to the different heights and shapes of the nose bridge, the second arc section is arranged to protrude towards the upper direction as shown in fig. 1, so that the fit between the concave part and the nose bridge can be better ensured, and the sealing and protecting effects of the mask are further improved.

In some embodiments, the first protrusion 211, the first circular arc segment 2131, the second circular arc segment 2132, the third circular arc segment 2133, and the second protrusion 212 are sequentially tangent. So set up, smooth transition between each circular arc section, the whole linearity of first side 21 is also more smooth, and has also played positive effect to the sealed effect of strengthening gauze mask bridge of the nose position.

In particular, as shown in fig. 3 and 9. The radii of the first arc segment 2131 and the third arc segment 2133 are 46.34mm, the arc lengths of the first arc segment 2131 and the second arc segment 2132 are 20.27mm, the radius of the second arc segment 2132 is 50mm, and the arc length of the second arc segment 2132 is 2.69mm.

It is understood that the present application is not limited to the embodiment shown in fig. 2, for example, in other embodiments, as shown in fig. 6, the concave portion 213 is provided as a single arc segment, and protrudes toward the direction of the second side 22, where the radius of the arc segment is 60.19mm, and two ends are tangent to the first convex portion 211 and the second convex portion 212, respectively.

Compared with the concave structure with multiple sections of circular arcs, the concave structure has the advantages that the fitting degree with the nose bridge is low, but the wiring mode is simple, the production and the processing are convenient, and the processing cost is reduced.

In some embodiments, as shown in fig. 5, the first side 21 of the first tab 2 further has a first diagonal segment 214 and a second diagonal segment 215, one end of the first diagonal segment 214 is connected to the first protrusion 211, the other end of the first diagonal segment 214 is connected to the cover body through the first bending portion 216, one end of the second diagonal segment 215 is connected to the second protrusion 212, and the other end of the second diagonal segment 215 is connected to the cover body 1 through the second bending portion 217.

In some embodiments, in the closed position, the angle between the connecting line between the highest point of the first protrusion and the highest point of the second protrusion and the first diagonal segment 214 is 15 degrees, and the angle between the connecting line between the highest point of the first protrusion and the highest point of the second protrusion and the second diagonal segment 215 is 15 degrees, in the projection of the first tab 2 on the inner side of the cover 1.

As shown in fig. 8, in some embodiments, the maximum length of the first tab 2 is 187.7mm, the length of the cover 1 is 218mm, where the direction of the length refers to the right-left direction as shown in fig. 1, the maximum length of the first tab 2 refers to the straight line distance from the leftmost end to the rightmost end of the first tab 2 in the right-left direction, and the length of the cover 1 refers to the straight line distance from the leftmost end to the rightmost end of the cover 1 in the right-left direction.

It is understood that the first convex part is connected with the inner side surface of the cover body through the first oblique line segment and the first bending part in sequence, and the second convex part is connected with the inner side surface of the cover body through the second oblique line segment and the second bending part in sequence. The straight line segment is a part attached to the face, the bending part is a transition part from the straight line segment to the cover body, and the straight line segment is provided with a specific angle (15-degree included angle as described above), so that the first inclined line segment, the second inclined line segment and the face are guaranteed to have better attaching degree, the face structure is further adapted, and the attaching degree of the first folding piece and the face is guaranteed.

In some embodiments, the first flap 2 includes a first body portion 23 and a first fold-over portion 24, the first body portion 23 is in fit connection with the inner side of the cover 1, the first fold-over portion 24 is connected to the first body portion 23 and is foldable relative to the first body portion 23, and the first fold-over portion 24 includes the first side 21 of the first flap 2. As shown in fig. 1, the junction of the first body portion 23 and the first fold 24 is adjacent to the upper edge of the cover 1.

Specifically, as shown in fig. 4, the whole cover body 1 is in a fusiform shape, the width gradually decreases from the middle to two ends, the upper edge and the lower edge of the cover body 1 are arc-shaped, and two ends of the cover body 1 are used for connecting hanging lugs. The junction of the first body portion 23 and the first fold 24 is generally arcuate and is consistent with the arcuate shape of the upper edge of the cover 1.

First, the first body portion is connected with the medial surface laminating of the cover body, and this kind of connected mode is very stable. The connecting line of the first turnup and the cover body is in arc distribution, so that when the cover body is in a plane state, the first turnup and the first body part are simultaneously attached to the inner side surface of the cover body, and when two ends of the cover body are bent towards the inner side surface of the cover body, the first turnup is turned over from a closed position to an open position along with the bending of the two ends of the cover body, and at the moment, the mask can be worn on the face and good attachment is realized.

In some embodiments, as shown in fig. 1, the mask further includes a second flap 3, where the second flap 3 is disposed on the inner side of the mask body 1 and is foldable between a closed position, where the second flap 3 is attached to the inner side of the mask body 1, and an open position, where at least a portion of the second flap 3 is away from the inner side of the mask body 1, where the second flap 3 is disposed opposite the first flap 2 in the width direction of the first flap 2.

As shown in fig. 7, the second flap 3 is disposed at the upper and lower positions of the cover body opposite to the first flap 2, and is similar in structure, except that the lower side surface of the second flap 3 is different from the first side surface 21 of the first flap 2, and the first side surface 21 has a convex portion and a concave portion, so that the closed position and the open position of the second flap 3 and the closed position and the open position of the first flap 2 are the same two states.

The second folded piece is used for guaranteeing the sealed effect of gauze mask and chin position, compares in adopting the cover body to directly laminate with the chin position, sets up the effect of second folded piece obviously better, in order to further improve the sealed effect of second folded piece, and the downside of second folded piece sets up to smooth curved surface structure, as shown in fig. 7, and the second folded piece is in closed position, in the projection of cover internal side, the downside of second folded piece is the arc.

In some embodiments, the second flap 3 includes a second body portion 31 and a second folding portion 32, where the second body portion 31 is attached to the inner side surface of the cover 1, and the second folding portion 32 is connected to the second body portion 31 and is foldable relative to the second body portion 31. The beneficial effects brought by this structure are the same as those of the first tab 2, and will not be described again.

The statistics made by the applicant and the calculation process are described in relation below.

Table 1 is a statistical calculation of the size of the nose bridge of the country, which is in contact with the mask, after the face shape investigation of the country, and includes two data, i.e., the nose width (S1) and the nose height (H1).

Table 1

	Width in nose S1	Nose middle-high H1
			Average value of	31.3	15.0
Maximum value	45.0	27.1
			Minimum value	20.1	8.1

According to the data of the mid-nose width and the mid-nose height in table 1, according to the formulaThe data for arc length S2 of the groove around the bridge of the nose is calculated as shown in table 2.

Table 2

	Average value of	Maximum value	Minimum value
				Arc length S2	43.355	70.446	25.816

According to the above embodiment, the arc length S, the groove width L and the groove depth H are calculated to obtain the ratio of the groove width L to the arc length SThe ratio of groove depth H to arc length S +.>

Arc length s=55.55 mm, slot width l6=54.2 mm; groove depth h=5.3 mm;

ratio of groove width to arc lengthL6＝0.9757*S；

Ratio of groove depth to arc lengthH＝0.09541*S；

From the above ratios, the groove size ranges of the groove structures were calculated as shown in table 3.

TABLE 3

	Average value of	Maximum value	Minimum value
				Groove width L6	42.3015	68.734	25.1887
Groove depth H	4.1365	6.7213	2.4631

From table 3, the dimensional ranges of groove width L and groove depth H are derived:

25.1887 the groove width L6 is less than or equal to 68.734;

2.4631 the groove depth H is less than or equal to 6.7213;

the applicant of the present application performs related comprehensive tests on masks with different sizes, and table 4 and table 5 are test data of the embodiment of the present invention, and table 6 and table 7 are test data of masks with the same groove size as the embodiment of the present invention, but different wiring modes.

In the following table, the meaning of the various data is:

filtration efficiency PPE%: the mask has the filtering efficiency on non-oily particles under a certain gas flow;

ventilation resistance pa: the inhalation resistance of the mask under a certain air flow;

adhesion: the mask design should provide good adhesion, and the total fit factor of the mask should be not less than 100;

table 4

Table 5

Table 6

Table 7

The applicant of the present application also tested five masks having different groove widths L and groove depths H, with the following test results: the test data of the mask at a groove width of 42.3015mm and a groove depth of 4.1365mm are shown in tables 8 and 9.

Table 8

Table 9

The size of the groove is as follows: the test data of the mask at a groove width of 40.1887mm and a groove depth of 4.4631mm are shown in tables 10 and 11.

Table 10

Table 11

The size of the groove is as follows: the groove width was 60.734mm and the groove depth was 5.6213mm, and the test data of the mask are shown in tables 12 and 13.

Table 12

Table 13

The mask had a groove width of 25.1887mm and a groove depth of 2.4631mm, and test data of the mask are shown in tables 12 and 13.

Table 14

Table 15

The mask size was 68.734mm in groove width and 6.7213mm in groove depth, and the test data of the mask are shown in tables 12 and 13.

Table 16

Table 17

The applicant of the present application also tested the relevant parameters of KF94 masks on the market, the test data being shown in table 18 and table 19:

table 18

Table 19

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The data of KF94 mask is compared with the data of the mask in the embodiment of the present invention, as shown in table 20 (the data in table 20 are all average data):

form 20

From the above data, we can derive a mask of the present embodiment that has overall superior performance to KF94.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims

1. A mask, comprising:

a cover body;

the first folding piece comprises a first body part and a first folding part, the first body part is in fit connection with the inner side surface of the cover body, the first folding part is connected with the first body part and can be folded relative to the first body part, the first folding part comprises a first side surface of the first folding piece, the connection part of the first body part and the first folding part is adjacent to the upper edge of the cover body, the first body part is in fit connection with the inner side surface of the cover body, the first folding part and the first body part are simultaneously fit on the inner side surface of the cover body, when two ends of the cover body are bent towards the inner side surface of the cover body, the first folding part is folded from a closed position to an open position, and the first folding piece also comprises a second side surface which is arranged opposite to the first side surface in the width direction;

the second folding piece is arranged on the inner side surface of the cover body and can be folded between a closed position and an open position, the second folding piece and the first folding piece are oppositely arranged in the width direction of the first folding piece, the second folding piece is attached to the inner side surface of the cover body in the closed position, and at least part of the second folding piece is far away from the inner side surface of the cover body in the open position; the second folding piece and the first folding piece are oppositely arranged at the upper and lower positions of the cover body, the second folding piece comprises a second body part and a second folding part, the second body part is in fit connection with the inner side surface of the cover body, and the second folding part is connected with the second body part and can be folded relative to the second body part;

the first side of the cover body is a curved surface and is provided with a first convex part, a second convex part and a concave part positioned between the first convex part and the second convex part, the whole concave part is an arc shape which is concave towards the second side, the distance between the highest point of the first convex part and the highest point of the second convex part is 25.1887mm-68.734mm, the first convex part, the second convex part and the concave part between the first convex part and the second convex part are smoothly transited by the curve, the curvature of the curve formed by the first convex part, the concave part and the second convex part is gradually increased from the symmetrical axial two sides of the first side, the concave part between the first convex part and the second convex part comprises a first arc section, a second arc section and a third arc section which are sequentially connected, the first arc section and the third arc section are all bulged along the direction towards the second side, the second arc section is bulged along the direction away from the second side, and the first arc section, the second arc section and the third arc section are sequentially tangent;

the shortest distance from the lowest point of the concave part to the highest point of the first convex part or the highest point of the second convex part in the width direction of the first folding piece is 2.4631mm-6.7213mm;

the distance between the highest point of the first convex part and the highest point of the second convex part is 40.1887mm-60.734mm; and/or the shortest distance from the lowest point of the concave part to the highest point of the first convex part or the highest point of the second convex part in the width direction of the first folded sheet is 4.4631mm-5.6213mm;

the first side of first fin still has first oblique line segment and second oblique line segment, the one end of first oblique line segment with first convex part is tangent, the other end of first oblique line segment with the cover body links to each other through first bending portion, the one end of second oblique line segment with the second convex part is tangent, the other end of second oblique line segment through second bending portion with the cover body links to each other, the inclination of first oblique line segment and second oblique line segment is 15.

2. The mask of claim 1, wherein a distance between a highest point of the first protrusion and a highest point of the second protrusion is 54.2mm; and/or the shortest distance in the width direction of the first tab from the lowest point of the concave portion to the highest point of the first convex portion or the highest point of the second convex portion is 5.3mm.

3. The mask of claim 1, wherein the first protrusion and the second protrusion are arc segments, and the radius of the arc segment corresponding to the first protrusion and the radius of the arc segment corresponding to the second protrusion are 15mm; and/or the number of the groups of groups,

the concave part is a circular arc section, the radius of the circular arc section corresponding to the concave part is 60.19mm, and two ends of the concave part are respectively tangent to the first convex part and the second convex part.

4. The mask of claim 1 wherein the radius of each of the first and third arc segments is 46.34mm, and/or,

the arc length of the first arc section and the third arc section is 20.27mm; and/or the number of the groups of groups,

the radius of the second arc segment is 50mm, and/or,

the arc length of the second arc section is 2.69mm.