CN111135498A

CN111135498A - Protective mask

Info

Publication number: CN111135498A
Application number: CN201811310914.2A
Authority: CN
Inventors: 郭顺平; 贺淑刚; 李良
Original assignee: Mehow Innovative Ltd
Current assignee: Mehow Innovative Ltd
Priority date: 2018-11-06
Filing date: 2018-11-06
Publication date: 2020-05-12

Abstract

The invention provides a protective mask which comprises a mask body, a filtering unit and a first sealing ring, wherein the mask body is provided with an arched structure enclosed towards the inner side, and a plurality of first vent holes penetrating through two sides are formed in the arched structure; the filtering unit has an arch structure which is approximately the same as the mask body, is attached to the inner side of the mask body and is used for filtering the respiratory air; the first sealing ring comprises a first ring body and a second ring body which are sequentially connected along the radial direction of the ring body, one end of the first ring body is connected to the edge of the inner side of the mask body, the other end of the first ring body extends towards the direction far away from the center of the mask body, the extending direction of the first ring body and the extending direction of the edge of the mask body form an acute angle, and the second ring body is curled towards the center of the mask body from the tail end of the first ring body; when the mask is worn, the protective mask is arranged on the face of a user, and the first sealing ring is pressed against the outer edge of the mouth and the nose. The protective mask provided by the invention can adapt to more users with different face sizes, and the application range is expanded.

Description

Protective mask

Technical Field

The invention relates to the technical field of wearable protective devices, in particular to a protective mask.

Background

The protective mask can filter air entering human respiratory tract, and a user can effectively prevent the oral cavity or the nasal cavity from inhaling harmful substances in the air after wearing the protective mask, thereby reducing the threat of air pollution to human health. For the protection effect who improves protective mask, prior art sets up the sealing washer by elastic material and make in face body subsides face one side usually, and during the use, the sealing washer laminating is at user's face for it is inboard that gas can not flow into the face guard through the gap between face guard and the face. However, because different human face sizes are greatly different, the elastic sealing ring has a certain elastic deformation capacity, but still cannot meet the requirements of all users.

Disclosure of Invention

The invention provides a protective mask, which is used for solving the problem that the existing protective mask is difficult to be suitable for users with different facial structures.

The invention aims to provide a protective mask which comprises a mask body, a filtering unit and a first sealing ring, wherein the mask body is provided with an arched structure enclosed towards the inner side, and a plurality of first vent holes penetrating through two sides are formed in the arched structure; the filtering unit is provided with an arch structure which is approximately the same as the mask body, is attached to the inner side of the mask body and is used for filtering the respiratory air; the first sealing ring comprises a first ring body and a second ring body which are sequentially connected along the radial direction of the ring body, one end of the first ring body is connected to the inner side edge of the mask body, the other end of the first ring body extends towards the direction far away from the center of the mask body, the extending direction of the first ring body and the extending direction of the edge of the mask body form an acute angle, and the second ring body is curled towards the center of the mask body from the tail end of the first ring body; when the mask is worn, the protective mask is arranged on the face of a user, and the first sealing ring is pressed against the outer edge of the mouth and the nose.

Further, the lengths of the left end and the right end of the first ring body are not less than 5 mm; the included angle between the extending direction of the left end and the extending direction of the right end of the first ring body and the extending direction of the left end and the right end of the mask body is not more than 60 degrees.

Further, the filter unit comprises a filter element, a first supporting piece and a second supporting piece, wherein the filter element is of a flexible sheet structure; the first supporting piece is of an arched plate-shaped structure, and a plurality of second vent holes are formed in the first supporting piece; the second supporting part is provided with a ring-shaped structure matched with the edge structure of the first supporting part, and a barrier strip is arranged on the second supporting part; the first supporting piece and the second supporting piece are clamped with each other from two sides of the filter element and then fix the filter element.

Further, be equipped with a plurality of first buckles and/or second draw-in groove on the first supporter, be equipped with first draw-in groove and/or second buckle on the second supporter, first supporter and second supporter are through the mutual block connection of first buckle and first draw-in groove, second buckle and second draw-in groove.

Furthermore, the lateral wall of the outer side of the first supporting piece is also provided with a plurality of convex columns, and in the process of clamping the filter element, the tail ends of the convex columns are abutted against the inner side of the filter element.

Further, the filtering unit is also provided with a first one-way valve which can allow gas to be discharged from the inner side to the outer side of the protective mask.

Furthermore, the first one-way valve comprises a valve seat and a valve plate, the valve seat is arranged on the first support body, and the valve plate is arranged in the valve seat; and the filter element and the second supporting piece are provided with a first through hole and a second through hole which are opposite to the first one-way valve.

Further, the protective mask also comprises a water absorption strip; the two ends of the barrier strip are connected to the bottom end of the second clamping portion and the bottom end of the second supporting piece respectively, and a groove for containing the water absorbing strip is formed in the outer side of the barrier strip.

Furthermore, an installation seat is arranged on the side wall of the inner side of the first support body, and the installation seat is annularly arranged on the periphery of the first one-way valve; the protective mask further comprises a nose mask, the nose mask is of a ring-shaped structure and comprises a fixing ring, a second sealing ring and at least one second one-way valve, the outer end of the fixing ring is mounted on the mounting seat, the second sealing ring is connected to the inner end of the fixing end, and the second one-way valve is arranged on the side wall of the fixing ring; when the protective mask is worn, the second sealing ring is pressed against the outer edge of the nose, and a first cavity for covering the nose of a user is formed between the inner side of the nose cover and the filtering unit; a second cavity for covering the mouth of the user is formed among the interior of the first sealing ring, the filtering unit and the exterior of the nose mask; the second one-way valve may allow gas to flow from the second chamber into the first chamber.

Furthermore, the protective mask also comprises two groups of headband components, one end of each headband component is respectively connected with the wing parts at the left end and the right end of the mask body, and the other ends of the headband components can be mutually connected, so that the protective mask can be fixed on the head of a user; the head band assembly comprises a connecting piece, a head band and a fixing sleeve, the connecting piece comprises a first connecting end and a second connecting end, the first connecting end is used for being connected with the wing part of the mask body, a groove penetrating to the tail end of the second connecting end is formed in the side wall of the second connecting end, and at least one second protruding clamping column is arranged on the inner wall of the groove; one end of the head band is provided with a connecting part matched with the groove structure, and a second clamping hole for sleeving the second clamping column is formed in the connecting part; the thickness of the inner cavity of the fixed sleeve is the same as that of the second connecting end and the head band; during assembly, the fixing sleeve penetrates through the head band, the connecting part is clamped in the groove of the second connecting end, the fixing sleeve is moved to be sleeved outside the second connecting end, and detachable connection of the head band and the mask body is achieved.

In the wearing process of the protective mask, after the sealing ring is pressed, a folded cambered surface structure is formed between the first ring body and the second ring body, and the cambered surface structure can deform in a larger range after being stressed, so that the protective mask can adapt to more users with different facial sizes, and the application range of the protective mask is expanded; in addition, first sealing washer is at the pressurized in-process, and first circle physical stamina provides reverse elasticity for the second circle body, has further promoted the wainscot effect of first sealing washer.

Drawings

Fig. 1 is a schematic view of a protective mask according to a first embodiment of the present invention.

Fig. 2 is a schematic view of the assembly of a portion of a face shield in accordance with a first embodiment of the present invention.

Figure 3 is a top view of a mask body and seal ring assembly according to a first embodiment of the present invention.

Figure 4 is a rear view of the mask body and seal assembly of the first embodiment of the present invention.

Fig. 5 is a cross-sectional view taken at the position a-a in fig. 4.

Fig. 6 is an exploded view of a filter unit according to a first embodiment of the present invention.

Fig. 7 is a schematic structural view of a second support body in the first embodiment of the present invention.

Fig. 8 is an assembly view of the first support body and the second support body in the first embodiment of the present invention.

Figure 9 is a schematic view of the first support body and the nose mask assembled in accordance with the first embodiment of the present invention.

Fig. 10 is a schematic view of the assembly of the mask body and headgear assembly in a first embodiment of the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

In this specification, it should be noted that "upper", "lower", "left", "right", "top" and "bottom" refer to the corresponding orientations of the protective mask when worn; when the protective mask is worn, one side or end close to the face of a user is an 'inner side' or an 'inner end', and one side or end far away from the face of the user is an 'outer side' or an 'outer end'.

Referring to fig. 1 to 5, a first embodiment of the present invention provides a face shield 1, which includes a face shield body 11, a filtering unit 12 and a first sealing ring 13, wherein the face shield body 11 has an inwardly enclosed arch structure, and a plurality of first ventilation holes 111 are formed through the arch structure; the filtering unit 12 has an arch structure substantially the same as that of the mask body 11, is attached to the inner side of the mask body 11, and is used for filtering the respiratory air; the first sealing ring 13 comprises a first ring body 131 and a second ring body 132 which are sequentially connected along the radial direction of the ring bodies, one end of the first ring body 131 is connected to the inner side edge of the mask body 11, the other end of the first ring body extends in the direction away from the center of the mask body 11, the extending direction of the first ring body 131 and the extending direction of the edge of the mask body 11 form an acute angle, and the second ring body 132 is curled from the tail end of the first ring body 131 to the center of the mask body 11; when the face guard is worn, the face guard 1 is arranged on the face of a user, and the first sealing ring 13 is pressed against the outer edge of the mouth and the nose.

In the compression process of the sealing ring structure provided by the embodiment, a folded arc-shaped structure is formed between the first ring body and the second ring body, and the arc-shaped structure can deform in a larger range after being stressed, so that the protective mask can adapt to more users with different facial sizes, and the application range of the protective mask is expanded; in addition, first sealing washer is at the pressurized in-process, and first circle physical stamina provides reverse elasticity for the second circle body, has further promoted the wainscot effect of first sealing washer.

Further, the lengths of the left and right ends of the first ring body 131 are not less than 5 mm; the extending direction of the left end and the right end of the first ring 131 and the extending direction of the left end and the right end of the mask body 11 form an included angle of not more than 60 degrees. This scheme can further increase the sealing washer to the deformation range of controlling both ends.

The mask body can be made of woven materials or injection-molded plastic or silica gel materials.

For the material of the first sealing ring, preferably, the first sealing ring 11 is formed by injection molding of silica gel.

Various connection modes can be provided for the mask body and the first sealing ring, for example, the silica gel sealing ring can be connected with the mask body made of textile materials in a sewing, bonding and other modes; can be connected with the mask body by secondary injection molding and the like.

In this embodiment, the mask body 11 is formed by injection molding of elastic plastic; the first sealing ring 13 is made of liquid silicone and is connected to the edge of the inner side of the mask body 11 by a secondary injection molding method.

Further, the face guard 1 further includes at least one mounting part 14, the mounting part 14 includes a decorative plate and a connecting part connected to a proximal end of the decorative plate, the decorative plate is used for mounting an ornament, and the connecting part is detachably fixed to the face guard body 11 from an outer side. In this embodiment, the connecting portion is clamped in the first vent hole 111. This scheme can conveniently set up or change the embellishment through setting up the installed part to make the protective face mask appearance more pleasing to the eye.

Further, the first sealing ring 13 further includes a flange 133 extending from a connection with the mask body 11 to a center direction of the mask body 11, and a clamping groove is formed between the flange 133 and the mask body 11 and is used for clamping an edge of the filtering unit 12. This scheme can realize dismantling of filter unit and insert and establish to be favorable to filter unit's installation and change.

In an alternative embodiment of the invention, in the injection molding process of the mask body, a clamping groove with an opening facing the center of the mask body is formed at the inner edge of the mask body, and the clamping groove is used for clamping the edge of the filtering unit.

Further, as shown in fig. 6 to 7, the filter unit 12 may allow gas to flow through from both sides, and includes a filter element 121, a first support 122, and a second support 123, the filter element 121 being used for filtering dust and particles; the first supporting member 122 and the second supporting member 123 are detachably engaged with each other from two sides of the filter element 121, and are used for fixing and supporting the filter element 121. The filter unit non-deformable that this scheme provided is favorable to the installation and dismantles going on of step.

In the present invention, in order to realize the filtration of the gas by the filter element, the first support member and the second support member need to be designed into a structure that can allow the gas to flow through, for example, a plurality of through holes can be arranged on the first support member and/or the second support member, the first support member and/or the second support member can be arranged into a grid structure, the first support member and/or the second support member can be arranged into a ring-shaped structure, and one or more barrier strips can be arranged on the first support member and/or the second support member. In this embodiment, the filter element 121 is a flexible sheet-shaped structure; the first supporting member 122 is an arched plate-shaped structure, and a plurality of second vent holes l221 are formed in the first supporting member; the second supporting member 123 has a ring-shaped structure matched with the edge structure of the first supporting member 122, and a barrier 1231 is arranged thereon; the first support member 122 and the second support member 123 can be engaged with each other to clamp and fix the filter cartridge 121. The steps for assembling the filter unit provided in this example are as follows: after the filter element 121 is attached to the outer side of the first supporting member 122, the ring-shaped structure of the second supporting member 123 is pressed and clamped on the edge of the first supporting member 122 to fix the edge of the filter element 121.

Further, a plurality of first buckles and/or second clamping grooves are arranged on the first support body 122, first clamping grooves and/or second buckles are arranged on the second support body 123, and the first support body 122 and the second support body 123 are connected through the mutual clamping of the first buckles and the first clamping grooves, and the mutual clamping of the second buckles and the second clamping grooves.

Furthermore, a plurality of protruding columns 1222 are further disposed on the outer side wall of the first supporting member 122, and during the clamping process of the filter element 121, the ends of the protruding columns 1222 are abutted against the inner side of the filter element 121. The projection that this scheme provided can play the supporting role to the filter core, avoids the filter core closely to laminate on first support piece outside lateral wall to avoid the filter core to adsorb inhomogeneous and influence filter core life's problem.

Furthermore, a plurality of protrusions are annularly arranged on the outer edge of the first supporting member 122 and/or the inner side of the ring-shaped structure of the second supporting member 123, and when the filter element 121 is clamped between the first supporting member 122 and the second supporting member 123, the protrusions are pressed on the edge of the filter element. This scheme can make the filter core fixed inseparabler, avoids the filter core to shift.

Further, the first support 122 and/or the second support 123 are provided with an accommodating hole 1232, and the accommodating hole 1232 is used for placing a fragrant bead, a medicine, and the like. In this embodiment, the receiving hole 1232 is formed in the second support 123.

Further, the filter unit 12 is provided with a first check valve which can allow gas to be discharged from the inside of the face shield to the outside. This scheme is through setting up first check valve for exhaled gas can be preferentially discharged to the protective face mask outside from first check valve, thereby has reduced the volume of exhaled gas from filter core exhaust, has prolonged the life of filter core.

In this embodiment, the first one-way valve includes a valve seat 1223 and a valve plate 1224, the valve seat 1223 is disposed on the first support 122, and the valve plate is disposed in the valve seat 1223; the filter element 121 and the second support member 123 are provided with a first through hole 1211 and a second through hole 1233 opposite to the first check valve.

Further, a first clamping portion is arranged on the outer side of the first support body 122, and the first clamping portion is annularly arranged on the periphery of the edge of the valve seat; the second support body 123 is provided with a second clamping portion clamped with the first clamping portion, and the edge of the first through hole of the filter element 121 is clamped between the first clamping portion and the second clamping portion.

Further, the protective mask also comprises a water absorption strip 15; the two ends of the barrier strip 1231 are connected to the bottom end of the second clamping portion and the bottom end of the second supporting member 123 respectively, and a groove for accommodating the water absorbing strip 15 is formed in the outer side of the barrier strip 1231. This scheme can in time absorb the moisture in the gas of following first check valve exhalation, prevents that moisture from gathering influence face guard protecting effect. This scheme will absorb water the strip setting in the below of first check valve gas outlet, can in time clear away the moisture in the expired gas, avoid moisture to gather inside protective face mask.

Furthermore, the water absorption strip 15 is provided with a first clamping hole, and the inner wall of the groove is provided with a first clamping column for clamping the first clamping hole. This scheme can avoid the strip that absorbs water to drop.

Further, a retaining ring surrounding the second through hole 1233 and the outer side of the slot is arranged on the outer side of the second supporting member 123, and when the filtering unit 12 is arranged on the inner side of the mask body, the retaining ring tightly abuts against the inner side of the mask body. This scheme can be with the restriction of expired gas in the inboard cavity that encloses with the face guard body of retaining ring, makes expired gas directly flow from the first air vent on the face guard body, avoids expired gas to flow back to the second cavity in from the filter unit.

Furthermore, a first water through hole penetrating through the bottom end of the check ring is formed in the bottom end of the mask body, and a second water through hole communicated with the first water through hole is formed in the bottom end of the mask body. This scheme is through setting up first limbers and second limbers, can make the moisture shunt of condensation in the expired gas to the protective face mask outside.

Further, a plurality of protrusions are further annularly disposed on the outer edge of the second supporting member 123. This scheme can increase the frictional force when filter unit inserts and establishes, avoids filter unit and face guard body inner edge bonding and damage face guard.

Further, as shown in fig. 8, the top end of the first supporting body 122 is screwed to the top end of the second supporting body 123. Specifically, in this embodiment, the top end of the first support body 122 is provided with a horizontal connecting rod, the top end of the second support body 123 is provided with a screw joint buckle for clamping the connecting rod, and the screw joint between the first support body 122 and the second support body 123 can be realized by clamping the screw joint on the connecting rod. This scheme can improve the integrated level of filter unit, has reduced the degree of difficulty that first supporter and second supporter align the block, has simplified filter unit's assembly procedure.

Further, as shown in fig. 9, an installation seat 1225 is disposed on a side wall of the inner side of the first support 122, and the installation seat 1225 is annularly disposed on the periphery of the first check valve; the protective mask 1 further comprises a nose mask 16, the nose mask has a ring-shaped structure and comprises a fixing ring 161, a second sealing ring 162 and at least one second one-way valve 163, the outer end of the fixing ring 161 is mounted on the mounting seat 1225, the second sealing ring 162 is connected to the inner end of the fixing end 151, and the second one-way valve 163 is arranged on the side wall of the fixing ring 161; when the protective mask is worn, the second sealing ring 162 is pressed against the outer edge of the nose, and a first cavity for covering the nose of a user is formed between the inner side of the nose mask 16 and the filtering unit 12; a second cavity for covering the mouth of the user is formed between the interior of the first sealing ring 13 and the exterior of the filter unit 12 and the nose mask 16; the second one-way valve 163 may allow gas to flow from the second chamber into the first chamber. This scheme is through setting up the nose cup for protective mask is particularly useful for inhaling through oral cavity and/or nasal cavity, the breathing mode of nasal cavity expiration. When the respirator inhales through the oral cavity, the air entering the second cavity can be inhaled through the oral cavity; when the nasal cavity inhales, under the action of negative respiratory pressure, air entering the second cavity can flow into the first cavity through the second one-way valve and then is inhaled into the lung of a user. Compare with the protective face mask that does not set up the nose cup, exhale gas can discharge from first check valve fast under the effect of first cavity internal pressure, can not be in diffusion to the second intracavity to effectively reduced exhale gas at the inboard volume of gathering of protective face mask, avoided moisture in the exhale gas to condense the filter effect who influences the filter core in the filter core, promoted the travelling comfort that protective face mask used.

Further, the fixing ring 161 is made of a plastic material, and the second sealing ring 162 is made of a silicone material; the fixing ring 161 and the second sealing ring 162 are coupled by a two-shot molding method.

Further, as shown in fig. 10, the protective mask 1 further includes two sets of headband assemblies respectively connected to the wing portions at the left and right ends of the mask body 11, the headband assembly includes a connecting member 171, a headband 172 and a fixing sleeve 173, the connecting member 171 includes a first connecting end and a second connecting end, the first connecting end is used for being connected with the wing portion of the mask body 11, a groove penetrating to the end of the second connecting end is formed on the side wall of the second connecting end, and at least one second protruding clamping column is formed on the inner wall of the groove; one end of the head band 172 is provided with a connecting part 1721, the structure of the connecting part 1721 is matched with the groove structure, and a second clamping hole for being sleeved on a second clamping column is formed in the connecting part; the thickness of the inner cavity of the fixing sleeve 173 is the same as the thickness of the second connecting end and the head band 172; during assembly, the fixing sleeve penetrates through the head band, the connecting part 1721 is arranged in the groove of the second connecting end in a matching manner, and the fixing sleeve 173 is moved to be sleeved outside the second connecting end to realize detachable connection of the head band and the mask body; the other ends of the two groups of headband assemblies can be connected with each other, so that the mask body can be fixed on the head of a user. The bandeau connected mode simple structure that this scheme provided is difficult for droing.

In this embodiment, the connecting member and the mask body may be fixedly connected by a secondary injection molding method. Further, the headband assembly further comprises an ear hook 174, wherein the ear hook 174 is made of an elastic material and comprises an ear hanging belt 1741 located in the middle and two movable sleeves 1742 connected to two ends of the ear hanging belt 1741, and the two movable sleeves 1742 are used for being sleeved on the same headband 173. The protective face mask that this scheme provided is wearing the in-process, and the bandeau subassembly is fixed behind user's head, and the ear-hang is used for hanging and establishes at user's ear to make wearing of protective face mask more stable.

An alternative embodiment of the present invention further provides a face shield, which is different from the first embodiment only in that one end of the ear-hanging strap is connected to the movable sleeve, and the other end is fixedly connected to the headband/face shield body.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A protective mask is characterized by comprising a mask body, a filtering unit and a first sealing ring, wherein the mask body is provided with an arched structure enclosed towards the inner side, and a plurality of first vent holes penetrating through two sides are formed in the arched structure; the filtering unit is provided with an arch structure which is approximately the same as the mask body, is attached to the inner side of the mask body and is used for filtering the respiratory air; the first sealing ring comprises a first ring body and a second ring body which are sequentially connected along the radial direction of the ring body, one end of the first ring body is connected to the inner side edge of the mask body, the other end of the first ring body extends towards the direction far away from the center of the mask body, the extending direction of the first ring body and the extending direction of the edge of the mask body form an acute angle, and the second ring body is curled towards the center of the mask body from the tail end of the first ring body; when the mask is worn, the protective mask is arranged on the face of a user, and the first sealing ring is pressed against the outer edge of the mouth and the nose.

2. The face shield according to claim 1, wherein the first ring body has a length of not less than 5mm at both left and right ends; the included angle between the extending direction of the left end and the extending direction of the right end of the first ring body and the extending direction of the left end and the right end of the mask body is not more than 60 degrees.

3. A face shield according to claim 2, wherein the filter unit comprises a filter element, a first support member and a second support member, the filter element being of a flexible sheet-like construction; the first supporting piece is of an arched plate-shaped structure, and a plurality of second vent holes are formed in the first supporting piece; the second supporting part is provided with a ring-shaped structure matched with the edge structure of the first supporting part, and a barrier strip is arranged on the second supporting part; the first supporting piece and the second supporting piece are clamped with each other from two sides of the filter element and then fix the filter element.

4. The face shield according to claim 3, wherein the first support body is provided with a plurality of first fasteners and/or second fasteners, the second support body is provided with a plurality of first fasteners and/or second fasteners, and the first support body and the second support body are connected by the first fasteners and the first fasteners, and the second fasteners.

5. A face shield according to claim 4, wherein the outer side wall of the first support member further comprises a plurality of protruding posts, and the ends of the protruding posts abut against the inner side of the filter element during the engagement of the filter element.

6. A face shield according to claim 5, wherein the filter unit is further provided with a first one-way valve which allows gas to escape from the inside of the face shield to the outside.

7. A face shield according to claim 6, wherein the first one-way valve comprises a valve seat and a valve plate, the valve seat being disposed on the first support body, the valve plate being disposed within the valve seat; and the filter element and the second supporting piece are provided with a first through hole and a second through hole which are opposite to the first one-way valve.

8. A face shield according to claim 7, further comprising a water-absorbing strip; the two ends of the barrier strip are connected to the bottom end of the second clamping portion and the bottom end of the second supporting piece respectively, and a groove for containing the water absorbing strip is formed in the outer side of the barrier strip.

9. A face shield according to claim 7, wherein the first support body is provided with a mounting seat on the inner side wall thereof, and the mounting seat is arranged around the periphery of the first one-way valve; the protective mask further comprises a nose mask, the nose mask is of a ring-shaped structure and comprises a fixing ring, a second sealing ring and at least one second one-way valve, the outer end of the fixing ring is mounted on the mounting seat, the second sealing ring is connected to the inner end of the fixing end, and the second one-way valve is arranged on the side wall of the fixing ring; when the protective mask is worn, the second sealing ring is pressed against the outer edge of the nose, and a first cavity for covering the nose of a user is formed between the inner side of the nose cover and the filtering unit; a second cavity for covering the mouth of the user is formed among the interior of the first sealing ring, the filtering unit and the exterior of the nose mask; the second one-way valve may allow gas to flow from the second chamber into the first chamber.

10. The face guard according to claim 1, wherein the face guard further comprises two sets of headband assemblies, one end of each headband assembly is connected with the left and right wing parts of the face guard body, and the other ends of the headband assemblies can be connected with each other, so that the face guard can be fixed on the head of a user; the head band assembly comprises a connecting piece, a head band and a fixing sleeve, the connecting piece comprises a first connecting end and a second connecting end, the first connecting end is used for being connected with the wing part of the mask body, a groove penetrating to the tail end of the second connecting end is formed in the side wall of the second connecting end, and at least one second protruding clamping column is arranged on the inner wall of the groove; one end of the head band is provided with a connecting part matched with the groove structure, and a second clamping hole for sleeving the second clamping column is formed in the connecting part; the thickness of the inner cavity of the fixed sleeve is the same as that of the second connecting end and the head band; during assembly, the fixing sleeve penetrates through the head band, the connecting part is clamped in the groove of the second connecting end, the fixing sleeve is moved to be sleeved outside the second connecting end, and detachable connection of the head band and the mask body is achieved.