KR20210143136A - Mask - Google Patents

Abstract

The present invention relates to a mask including: a mask body provided with a cartridge coupling hole; and a filter cartridge provided with a case separably mounted in the cartridge coupling hole and a filter separably mounted in the case. The filter has: a filter sheet collecting and removing foreign matter in the air supplied to a wearer's respiratory organ through the cartridge coupling hole; and solid oxygen applied to at least one surface of the filter sheet. According to the present invention, the filter cartridge can be separably mounted in the mask body or the filter can be separably mounted in the filter cartridge. In the event of long-time use of the mask, the mask itself does not have to be replaced and the filter cartridge or the filter can be selectively replaced to keep using the mask. As a result, the mask can be used for a long time at a low cost.

Description

mask {Mask}

The present invention relates to a mask.

The mask is a member mounted on the wearer's face to block external contaminants from reaching the wearer's respiratory tract.

Recently, as social interest in ultrafine dust is growing and viral diseases such as SARS, MERS, and Corona 19 are on the rise, the demand for health masks that can block fine particles such as ultrafine dust and viruses is increasing. is increasing significantly.

In the conventional health mask, a high-voltage current is applied to a porous nonwoven material to make the microstructure stand out with static electricity, and then, an electrostatic filter manufactured to collect fine particles using the static electricity is mainly applied. Such a conventional health mask is difficult to use for a long time due to the characteristics of an electrostatic filter that removes static electricity when it comes into contact with moisture, and thus has a problem in that the mask itself must be discarded when used for a certain period of time or longer.

In addition, in the conventional health mask, the filter load is large due to the characteristics of the nonwoven material, in which the fibers are densely entangled and air is difficult to pass smoothly. There was a problem with doing it.

The present invention is to solve the problems of the prior art, and an object of the present invention is to provide a mask with an improved structure so that the filter can be replaced.

Furthermore, an object of the present invention is to provide a mask having an improved structure so that a sufficient amount of oxygen required for breathing can be supplied to the wearer.

A mask according to a preferred embodiment of the present invention for solving the above problems, the mask body having a cartridge coupling hole; and a filter cartridge having a case detachably mounted to the cartridge coupling hole, and a filter detachably mounted to the case, wherein the filter is provided to the air supplied to the wearer's respirator through the cartridge coupling hole. It has a filter sheet for collecting and removing the contained foreign matter, and solid oxygen applied to at least one surface of the filter sheet.

Preferably, the filter further has a guide sheet laminated on the filter sheet for guiding the air to flow along a predetermined path.

Preferably, the guide sheet has a plurality of guide holes formed at predetermined intervals to guide the air from the outside of the filter to the filter or from the filter to the outside of the filter.

Preferably, the solid oxygen is applied to both surfaces of the filter sheet, respectively, and the guide sheet is provided with a plurality of first guide holes at predetermined intervals, and covers the solid oxygen applied to one surface of the filter sheet. A first guide sheet laminated on one surface of the filter sheet to be stacked, a plurality of second guide holes are formed at predetermined intervals, and the filter to cover the solid oxygen applied to the other surface of the filter sheet opposite to the one surface and a second guide sheet laminated on the other surface of the sheet.

Preferably, the fill sheet is interposed between the first guide sheet and the second guide sheet in a state where the outer portion of the first guide sheet and the outer portion of the second guide sheet face each other, and faces each other The outer portion of the first guide sheet and the outer portion of the second guide sheet are attached to seal the gap therebetween.

Preferably, the first guide holes and the second guide holes are formed to face each other with the film sheet therebetween.

Preferably, the case has a first case in which the filter is accommodated, and a second case coupled to the second case to open and close the first case.

Preferably, the cartridge coupling hole has a cartridge fitting groove recessed on the inner surface, and the first case has a flange formed along the circumference so as to be detachably fitted into the cartridge fitting groove.

Preferably, the first case has an accommodating groove formed therein to accommodate the filter, and a plurality of first through-holes formed to communicate with the accommodating groove, and the second case includes the accommodating groove and It has a plurality of second apertures formed to communicate.

Preferably, the first case further has a hook groove formed at one end, and the second case is a coupling hook formed to be detachably hook-coupled to the hook groove when it is arranged to close the receiving groove. have more

Preferably, the second case further includes a stopper protruding from one surface to press the filter accommodated in the receiving groove when the second case is arranged to close the receiving groove.

The present invention relates to a mask, and has the following effects.

First, in the present invention, the filter cartridge can be detachably mounted on the mask body or the filter can be detachably mounted on the filter cartridge. According to the present invention, when the mask is used for a long time, it is possible to continue using the mask by selectively replacing only the filter cartridge or filter without replacing the mask itself, so that the mask can be used for a long time with a small maintenance cost.

Second, the present invention can be supplied to the wearer after being mixed with oxygen generated from solid oxygen while the external air is purified by the filter when the wearer breathes in. Since the present invention can supply the wearer with mixed air of external air and oxygen generated from solid oxygen, air containing a sufficient amount of oxygen required for breathing can be stably supplied to the wearer's respiratory tract.

1 is a front perspective view of a mask according to a preferred embodiment of the present invention;
Fig. 2 is a rear perspective view of the mask shown in Fig. 1;
Fig. 3 is a front view of the mask shown in Fig. 1;
Figure 4 is an exploded perspective view of the mask shown in Figure 1;
5 is a combined perspective view of the filter cartridge shown in FIG.
Figure 6 is an exploded perspective view of the filter cartridge shown in Figure 5;
7 is a cross-sectional view showing a cross section of the mask shown in FIG. 3 taken along line I-I.
Fig. 8 is a plan view of the filter shown in Fig. 6;
9 is a cross-sectional view showing a cross section of the filter shown in FIG. 8 taken along a line II-II.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function interferes with the understanding of the embodiment of the present invention, the detailed description thereof will be omitted.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the component from other components, and the essence, order, or order of the component is not limited by the term. In addition, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

Figure 1 is a front perspective view of a mask according to a preferred embodiment of the present invention, Figure 2 is a rear perspective view of the mask shown in Figure 1, Figure 3 is a front view of the mask shown in Figure 1, Figure 4 is It is an exploded perspective view of the illustrated mask.

Referring to FIG. 1 , the mask 1 according to a preferred embodiment of the present invention is detachable from the mask body 10 and the mask body 10 mounted on the wearer's face so as to cover at least a portion of the wearer's respirator. It may include a filter cartridge 20 that collects and removes fine dust and other foreign substances contained in the external air supplied to the wearer's respiratory tract upon inhalation.

First, the mask body 10 is a member which forms the external shape of the mask 1 .

The mask body 10 has a three-dimensional structure in which an accommodating space 11 in which at least a portion of the wearer's respirator, that is, the nose and mouth, is accommodated. The three-dimensional structure of the mask body 10 is not particularly limited. For example, as shown in FIG. 2 , the mask body 10 may have a hemispherical shape.

In addition, the size of the mask body 10 is not specifically limited. For example, the mask body 10 may have a size that can separate the wearer's respirator from the inner surface 13 of the accommodation space 11 by a predetermined reference distance or more.

In addition, the mask body 10 is preferably made of a material having non-breathability through which air cannot pass, elasticity that can be deformed according to the shape of the wearer's face, and adhesiveness that can be in close contact with the wearer's face. . For example, the mask body 10 may be made of a silicon material. In this case, the mask body 10 is preferably composed of a mixture including at least a silicone material and an antibacterial material, but is not limited thereto.

In addition, as shown in FIG. 2 , the mask body 10 is a band fixing member for fixing the contact part 15 for making the mask body 10 in close contact with the wearer's face, and the ear band (not shown). (17), and a cartridge coupling hole (19) formed so that the filter cartridge 20 can be detachably coupled may be provided.

The adhesion part 15 is formed at the end of the mask body 10 in contact with the wearer's face when the mask body 10 is mounted on the wearer's face. The structure of the adhesion part 15 is not specifically limited. For example, as shown in FIG. 2 , the close contact portion 15 extends from the end of the mask body 10 toward the inner surface 13 of the accommodation space 11 so as to correspond to the curved shape of the wearer's face. It may have a curved shape to be formed. This close contact portion 15 is in close contact with the wearer's face when the mask body 10 is worn to widen the contact area between the mask body 10 and the face, so that air can enter and exit between the mask body 10 and the face. It can prevent gaps from forming.

A pair of band fixing members 17, one at each left and right both ends of the mask body 10, may be installed in total. Each of the band fixing members 17 has at least one band coupling hole 17a to which an ear band (not shown) for fixing the mask body 10 to the wearer's face is coupled. The wearer may fix the ear band to the band coupling hole 17a of each of the band fixing members 17 and then hang the ear band on the ear, thereby fixing the mask body 10 to the wearer's face.

The cartridge coupling hole 19 is formed to penetrate the mask body 10 in the thickness direction. The number of formation of the cartridge coupling hole 19 is not particularly limited. For example, as shown in FIG. 3 , the cartridge coupling hole 19 may be formed as a total pair so as to be positioned one by one on the left and right with respect to the center of the mask body 10 .

The formation position of the cartridge coupling hole 19 is not particularly limited. For example, the cartridge coupling hole 19 is spaced apart from the wearer's respirator by a predetermined extra interval, and may be formed to be positioned at a height corresponding to the wearer's respirator when the mask 1 is worn.

In addition, as shown in FIG. 4 , a cartridge fitting groove 19a for fitting a filter cartridge 20 to be described later may be concavely formed on the inner surface of the cartridge coupling hole 19 .

5 is a combined perspective view of the filter cartridge shown in FIG. 4 , FIG. 6 is an exploded perspective view of the filter cartridge shown in FIG. 5 , and FIG. 7 is a cross-section of the mask shown in FIG. It is a cross-sectional view showing

5 and 6 , the filter cartridge 20 is detachably coupled to the cartridge coupling hole 19 of the mask body 10 through the case 21 and the cartridge coupling hole 19 . A filter 22 that collects and removes foreign substances contained in the air supplied to the wearer's respirator, and a cover sheet 23 that covers the filter 22 may be provided.

The case 21 includes a first case 24 for accommodating the filter 22 and the cover sheet 23 , and a second case 25 coupled to the first case 24 so as to open and close the first case. ), and so on. The case 21 is preferably made of a soft synthetic water material that can be elastically deformed, but is not limited thereto.

The first case 24 has a size and shape corresponding to the cartridge coupling hole 19 so that it can be inserted into the cartridge coupling hole 19 or drawn out from the cartridge coupling hole 19 .

As shown in FIG. 6 , the first case 24 has a receiving groove 24a formed therein to separably receive the filter 22 and the cover sheet 23 , and air can pass therethrough. A plurality of first through-holes (24b) formed so as to be, a flange (24c) formed to be detachably fitted into the cartridge fitting groove (19a) of the mask body (10), and a second case (25) A case fixing member 24d for fixing to the first case 24 may be provided.

As shown in FIG. 6 , the receiving groove 24a is recessed to have a predetermined depth in the center of the first case 24 . Correspondingly, the first through-holes 24b are formed to penetrate the first case 24 in the thickness direction so as to communicate with the receiving groove 24a. As shown in FIG. 6 , the first through holes 24b are preferably formed in a radial shape around the center of the first case 24 , but are not limited thereto.

As shown in FIG. 6 , the flange 24c is formed along the circumference of the first case 24 so that it can be detachably fitted into the cartridge fitting groove 19a of the cartridge coupling hole 19 . In addition, as shown in Figure 7, the flange (24c) is preferably formed so as to be inserted by a predetermined depth into the cartridge fitting groove (19a). As described above, the mask body 10 and the case 21 are made of an elastically deformable material, and while the mask body 10 and the case 21 are elastically deformed, the flange 24c is inserted into the cartridge fitting groove 19a. By fitting into or separating from the cartridge fitting groove (19a), the filter cartridge 20 can be mounted on the cartridge coupling hole 19 or separated from the cartridge coupling hole 19 .

As shown in FIG. 6 , the case fixing member 24d includes a first stopper 24e protruding from one surface of the flange 24c facing the wearer's face, that is, the rear surface of the flange 24c, and the flange 24c. ) may be provided with a hook groove (24f), etc. formed in a concave indentation on the inner surface of the first stopper (24e) so as to be located at one end of the rear surface.

The second case 25 is coupled to the first case 24 so as to be superimposed on the first case 24 or spread in parallel with the first case 24 . For example, shown in Figure 6?? As shown, the second case 25 is foldably coupled to the other end of the rear surface of the flange 24c opposite to the one end so as to be positioned on the opposite side of the hook groove 24f with respect to the receiving groove 24a. can be

In addition, the second case 25 has a predetermined shape and a predetermined shape so that one end can be in contact with the hook groove 24f while closing the receiving groove 24a when it is overlapped with the first case 24 . have a size

As shown in FIG. 6 , the second case 25 is hook-coupled to a plurality of second through-holes 25a formed to allow air to pass therethrough, and a hook groove 24f of the case fixing member 24d. It may have a coupling hook 25b formed to do so, and a second stopper 25c formed to press the filter 22 and the cover sheet 23 accommodated in the receiving groove 24a, and the like.

The second through-holes 25a have the second case 25 in the thickness direction so as to communicate with the receiving groove 24a when the second case 25 is disposed to overlap the first case 24 . formed to penetrate. As shown in FIG. 6 , the second through holes 25a are preferably formed to have a slit shape, but are not limited thereto.

As shown in FIG. 6 , the coupling hook 25b has a hook groove 24f so that the second case 25 can be hook-coupled to the hook groove 24f when the second case 25 is arranged to be superimposed on the first case 24 . ) is formed at the one end of the second case 25 in contact with. The coupling hook 25b may detachably fix the second case 25 to the first case 24 so that the filter 22 and the cover sheet 23 do not separate from the receiving groove 24a. .

As shown in FIG. 6 , the second stopper 25c includes the filter 22 and the cover sheet accommodated in the receiving groove 24a when the second case 25 is disposed to be superimposed on the first case 24 . (23) is formed to protrude on one surface of the second case 25 facing the receiving groove (24a) so as to press the filter 22 in the thickness direction.

The number of the second stoppers 25c to be formed is not particularly limited, and at least one second stopper 25c may be formed at a predetermined interval. As shown in FIG. 7 , the second stopper 25c presses the filter 22 and the cover sheet 23 inserted into the receiving groove 24a to close the filter 22 and the cover sheet 23 . It can be fixed so as not to flow in the receiving groove (24a).

FIG. 8 is a plan view of the filter shown in FIG. 6 , and FIG. 9 is a cross-sectional view illustrating a cross section of the filter shown in FIG. 8 taken along line II-II.

As shown in FIGS. 8 and 9 , the filter 22 includes a filter sheet 26 for collecting and removing foreign substances contained in air, and solid oxygen 27 applied to at least one surface of the filter sheet 26 . and a guide sheet 28 that is laminated on the filter sheet 26 to cover the filter sheet 26 and guides air to flow along a predetermined path.

The filter sheet 26 may be configured to include at least one of various types of filters capable of collecting and removing foreign substances contained in air. For example, the filter sheet 26 may be composed of an electrostatic filter formed to collect microparticles using static electricity after high-voltage current is applied to the porous nonwoven material to make the microstructure stand out with static electricity.

The filter sheet 26 has a shape and size corresponding to the receiving groove 24a so that it can be inserted into the receiving groove 24a or taken out from the receiving groove 24a.

As shown in FIG. 9 , solid oxygen 27 is preferably applied to both surfaces of the filter sheet 26 , but is not limited thereto. The solid oxygen 27 is preferably applied in a powder form, but is not limited thereto.

The guide sheet 28 is provided so as to cover the filter sheet 26 and the solid oxygen 27 applied to the filter sheet 26 . For example, as shown in FIG. 8 , the guide sheet 28 is provided on one side of the filter sheet 26 and the filter sheet 26 so as to cover the solid oxygen 27 applied to one side of the filter sheet 26 . The first guide sheet 28a laminated on one surface of the filter sheet 26 to cover the other surface of the filter sheet 26 opposite to the one surface and the solid oxygen 27 applied to the other surface of the filter sheet 26. It may have a second guide sheet 28b laminated on the other surface of the .

The guide sheet 28 is preferably made of a non-breathable material. For example, the guide sheet 28 may be made of a non-breathable synthetic resin material.

The first guide sheet 28a and the second guide sheet 28b each have a larger area than the filter sheet 26, and the receiving grooves can be inserted into the receiving grooves 24a or withdrawn from the receiving grooves 24a. It has a shape and size corresponding to (24a).

When the first guide sheet 28a and the second guide sheet 28b are provided in this way, the filter sheet 26 does not protrude outside the gap between the first guide sheet 28a and the second guide sheet 28b. It may be interposed in a gap between the first guide sheet 28a and the second guide sheet 28b. When the filter sheet 26 is disposed in this way, as shown in FIG. 9 , the filter sheet 26 and solid oxygen 27 are disposed between the center of the first guide sheet 28a and the center of the second guide sheet 28b. is positioned, and the outer portion of the first guide sheet 28a and the outer portion of the second guide sheet 28b face each other.

It is preferable that the outer portion of the first guide sheet 28a and the outer portion of the second guide sheet 28b face each other so as to seal the gap therebetween. For example, the outer portion of the first guide sheet 28a and the outer portion of the second guide sheet 28b may be attached to each other by thermal fusion. When the outer portion of the first guide sheet 28a and the outer portion of the second guide sheet 28b are attached as described above, the gap between the first guide sheet 28a and the second guide sheet 28b is sealed, so that the solid oxygen 27 ), it is possible to prevent the oxygen generated from leaking to the outside through the gap between the first guide sheet 28a and the second guide sheet 28b.

Also, as shown in FIG. 9 , the first guide sheet 28a guides air from the outside of the filter 22 to the filter sheet 26 or from the filter sheet 26 to the outside of the filter 22 . It may have a plurality of first guide holes (28c) formed at a predetermined interval to do so. Correspondingly, the second guide sheet 28b is provided at predetermined intervals to guide air from the outside of the filter 22 to the filter sheet 26 or from the filter sheet 26 to the outside of the filter 22 . It may have a plurality of second guide holes (28d) formed.

As shown in FIG. 8 , each of the first guide holes 28c and the second guide holes 28d preferably has a circular shape, but is not limited thereto. That is, each of the first guide holes 28c and the second guide holes 28d may have a polygonal shape or various other shapes. In addition, the number and size of the first guide holes 28c and the second guide holes 28d are not particularly limited, and the number of the first guide holes 28c and the second guide holes 28d is formed. and the size may be variously determined in consideration of the filter load.

As shown in FIG. 9 , the first guide holes 28c and the second guide holes 28d are formed to face each other with the filter sheet 26 and the solid oxygen 27 interposed therebetween. Preferably, it is not limited thereto. That is, the first guide holes 28c and the second guide holes 28d may be formed to be alternately positioned with the filter sheet 26 and the solid oxygen 27 interposed therebetween.

According to the first guide sheet 28a and the second guide sheet 28b, air supplied from the outside when the wearer breathes in, air discharged from the wearer's respiratory tract when the wearer exhales, and solid oxygen 27 The oxygen or the like may be guided to pass through the filter sheet 26 only through the first guide holes 28c and the second guide holes 28d. According to these first guide holes 28c and second guide holes 28d, the first guide sheet 28a and the second guide sheet 28b are suitable for the wearer to breathe smoothly with the filter load. It is possible to control the level, and it is possible to prevent the oxygen generated from the solid oxygen 27 from leaking out of the filter 22 without being supplied to the wearer's respiratory system.

The cover sheet 23 is provided to cover the filter 22 to protect it from the outside. For example, as shown in FIG. 6 , the cover sheet 23 includes a first cover sheet 23a provided to cover the first guide sheet 28a of the filter 22 , and the filter 22 . A second cover sheet 23b provided to cover the second guide sheet 28b may be provided.

This cover sheet 23 is made of a breathable material. For example, the cover sheet 23 may be made of a non-woven fabric having air permeability. In addition, the cover sheet 23 has a shape and size corresponding to the receiving groove 24a so as to be inserted into the receiving groove 24a or to be withdrawn from the receiving groove 24a.

When the mask 1 is provided as above, the external air when the wearer breathes in is purified by the filter 22 and mixed with oxygen generated from the solid oxygen 27 at the same time, and then supplied to the wearer's respirator. . As shown in FIG. 9 , the mask 1 can supply the air A1 in which the external air A0 and oxygen generated from the solid oxygen 27 are mixed to the wearer's respiratory tract, through which the It contains a sufficient amount of oxygen necessary for breathing and can stably supply cleanly purified air (A1) to the wearer's respiratory tract.

Further, in the mask 1 , the filter cartridge 20 can be detachably mounted to the mask body 10 , and the filter 22 can be detachably mounted to the filter cartridge 20 . Through this, the mask 1 can replace the filter cartridge 20 itself, or only the filter 22 can be selectively replaced. According to the mask 1, when the mask 1 is used for a long time, the mask 1 is continuously replaced by selectively replacing only the filter cartridge 20 or the filter 22 without replacing the mask 1 itself. As a result, the mask 1 can be used for a long time with a small maintenance cost.

The above description is merely illustrative of the technical spirit of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains.

Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

1: Mask
10: mask body
11: accommodating space
13: inner side
15: adhesion part
17: band fixing member
17a: band coupling hole
19: cartridge coupling hole
19a: Cartridge insertion groove
20: filter cartridge
21 : Case
22 : filter
23 : cover sheet
23a: first cover sheet
23b: second cover sheet
24: first case
24a: receiving groove
24b: first through hole
24c: flange
24d: Case fixing member
24e: first stopper
24f : hook groove
25: second case
25a: second through hole
25b : hook
25c: second stopper
26: filter sheet
27: solid oxygen
28: information sheet
28a: first guide sheet
28b: second guide sheet
28c: first guide
28d: second guide

Claims (11)

a mask body having a cartridge coupling hole; and
and a filter cartridge having a case detachably mounted to the cartridge coupling hole and a filter detachably mounted to the case,
The filter has a filter sheet for collecting and removing foreign substances contained in the air supplied to the wearer's respirator through the cartridge coupling hole, and solid oxygen applied to at least one surface of the filter sheet, the mask. According to claim 1,
wherein the filter further has a guide sheet laminated to the filter sheet and guiding the air to flow along a predetermined path. 3. The method of claim 2,
wherein the guide sheet has a plurality of guide holes formed at predetermined intervals to guide the air from the outside of the filter to the filter or from the filter to the outside of the filter. 4. The method of claim 3,
The solid oxygen is applied to both sides of the filter sheet, respectively,
The guide sheet includes a first guide sheet in which a plurality of first guide holes are formed at a predetermined interval and laminated on one surface of the filter sheet to cover the solid oxygen applied to one surface of the filter sheet, and a predetermined interval A mask having a second guide sheet having a plurality of second guide holes formed thereon and stacked on the other surface of the filter sheet to cover the solid oxygen applied to the other surface of the filter sheet opposite to the one surface. 5. The method of claim 4,
The filter sheet is interposed between the first guide sheet and the second guide sheet in a state where the outer portion of the first guide sheet and the outer portion of the second guide sheet face each other,
A mask, wherein the outer portion of the first guide sheet and the outer portion of the second guide sheet facing each other are attached so that a gap therebetween is sealed. 5. The method of claim 4,
The mask, wherein the first guide holes and the second guide holes are formed to face each other with the film sheet therebetween. According to claim 1,
The case, the mask having a first case in which the filter is accommodated, and a second case coupled to the second case to open and close the first case. 8. The method of claim 7,
The cartridge coupling hole has a cartridge fitting groove formed in a concave in the inner surface,
The first case, the mask having a flange formed along the circumference so as to be detachably fitted into the cartridge fitting groove. 8. The method of claim 7,
The first case has an accommodating groove formed therein to accommodate the filter, and a plurality of first through holes formed to communicate with the accommodating groove,
The second case has a plurality of second through-holes formed to communicate with the receiving groove, the mask. 10. The method of claim 9,
The first case further has a hook groove formed at one end,
The second case further has a coupling hook formed to be detachably hook-coupled to the hook groove when it is arranged to close the receiving groove. 10. The method of claim 9,
The second case may further include a stopper protruding from one surface to press the filter accommodated in the receiving groove when the second case is disposed to close the receiving groove.

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