CN220898011U - Mask capable of changing filter cloth for preventing and controlling virus infectious disease - Google Patents

Abstract

The mask capable of replacing the filter cloth for preventing and controlling the virus infectious diseases comprises a support, the filter cloth and a headband or an ear strap, wherein the support consists of an outer support and an inner support, the frame of the outer support is connected with the frame of the inner support through plug connection, the periphery of the inner support is provided with a leak-proof inner curled edge, or the inner periphery of the inner support is provided with a leak-proof sealing piece made of a high-elasticity material; or the periphery of the double brackets is provided with a leak-proof film sealing edge sleeve which is also used for preventing side leakage and is made of high-elasticity materials; the filter cloth is arranged between the inner bracket and the outer bracket. Compared with the existing KN95 type medical mask, the mask has the advantages that the structure is simple, the filter cloth is convenient to replace, and the mask can be reused after the filter cloth is replaced; the sealing performance is better, and different filter materials are used, so that the level of the KN 95-near KN 100-level mask can be respectively achieved.

Description

Mask capable of changing filter cloth for preventing and controlling virus infectious disease

Technical Field

The utility model relates to a mask for preventing and controlling virus infectious diseases, in particular to a mask for preventing and controlling virus infectious diseases, which is provided with replaceable filter cloth.

Background

The N90 plane disposable medical surgical mask widely used at present has the advantages of simple structure, convenient use, low price and easy acceptance by consumers. The defect is that the heat-sealing points around the mask body are too dense, excessive and hard, the sealing performance is poor, the elasticity of the nose clip is small, the leakage rate is high, viruses are easy to enter from the gaps around the mask, and the wet resistance is increased quickly after the mask is used; the ear belt is too thin, the tightness of the ear belt can not be adjusted when the ear belt is worn, and the ear belt is difficult to wear and is stable; the edge folds on the two sides of the mask are large; the total leakage rate of the public in practical use is up to more than 10%. The spread of the virulent viral infectious diseases cannot be effectively prevented; the KN 95-level mask with better performance is a national product like beauty 3M, is not fit with the faces of people of all ages and both sexes, the ear bands can not be adjusted and used as the head bands, and can only prevent and control about 85-95% of virus infection, and in addition, many people only deal with the fact that the mask is hung on the ears and does not seriously press nose clamping strips, the real anti-infectious disease efficiency is less than or equal to 90%, the resistance is large, the wet resistance rising rate is also large, the price is high, filter cloth can not be replaced, 1 filter cloth is discarded every day, and the national infectious disease, the unit and the individual are difficult to use for a large amount for a long time, and the virus infection can not be prevented and controlled more than 99%.

CN211932731U discloses a removable filter core type antivirus mask, wraps antivirus mask body, the equal fixed mounting in left and right sides of antivirus mask body has the elastic webbing, set up the mounting groove in the front wall of antivirus mask body, the inside rear fixed mounting of mounting groove has the snap fastener socket of relative setting all around, first filter core has been placed to the inside of mounting groove, the mounting hole has been seted up on the first filter core, the inside fixed mounting of mounting hole has snap fastener plug, and snap fastener plug joint in snap fastener socket, the storage groove has been seted up in the top of antivirus mask body, the front and back wall top fixed mounting of storage groove has the magic face of facing, the inside grafting of storage groove has the second filter core, the position fixed mounting of the relative magic face of facing of second filter core top has the magic face of facing, and the magic face of facing is glued on the magic face of facing. The structure is complex, the use is inconvenient, the unit price is expensive, and the problem of leakage around the mask is not solved.

CN213698614U discloses a reusable anti-virus mask, which comprises a rubber pad, wherein the outer wall of the rubber pad is processed with first meshes, the left side and the right side of the outer wall of the rubber pad are fixedly connected with belt bodies, and the top of the rubber pad is provided with a replacement mechanism; the replacement mechanism comprises a groove frame, a rubber ring, a filter element, a cover body and a second mesh; the groove frame is fixedly connected to the top of the rubber pad, the rubber ring is fixedly connected to the inner wall of the groove frame, the filter element is attached to the bottom of the inner wall of the groove frame, the cover body is in interference fit with the inner wall of the rubber ring, the bottom of the cover body is attached to the top of the filter element, and the second mesh is machined on the outer wall of the cover body; the left and right sides of the outer wall of the groove frame are provided with fixing mechanisms for fixing the cover body. The problems of complex structure, poor sealing performance, low antivirus efficiency, high price and the like exist.

CN212088231U discloses a reusable anti-virus mask, comprising a mask, a cloth cylinder is sewed above the front face of the mask, steel wires are in interference fit with the inside of the cloth cylinder, and an isolation layer is arranged on the front face of the mask. This repeatedly usable's anti-virus mask, through the cooperation between gauze mask, the gasket, first elastic cord, cloth pocket and the horizontal cloth, through the mode of changing the gasket, guarantee the protection effect of this repeatedly usable's anti-virus mask, reduce the waste of material, and then reduce cost, be fit for use in batches, it is fixed through the ear that the mode of cover at the head replaces traditional gauze mask, avoid the ear uncomfortable, through the plastic cap, the rubber slide rail, the cooperation between rubber strip, plastic transparent plate and the third elastic cord, improve protection effect, be applicable to medical, through the frame, cardboard and two-dimensional code, make things convenient for other people to recognize, provide convenient for use. The utility model also has the problems of complex structure, poor sealing performance, low antivirus efficiency, high price and the like.

CN211751898U also discloses a reusable anti-virus mask, comprising a transparent cover, a filter screen and a hanging rope, wherein the left end of the transparent cover is embedded with a marking area, the right end of the transparent cover is fixedly connected with a silica gel strip, and the bottom of the transparent cover is provided with a filter component; the filter component comprises a rubber ring, a second filter screen and a clamping component. This repeatedly usable's antivirus mask, through the cooperation of transparent cover, sign district, string rope, silica gel strip and filter component, after the device uses, the accessible is high voltage sterilization negative electrode piece and high voltage sterilization positive electrode needle lead to high voltage and effectively kill its filter component inside remaining germ, also can carry out repeatedly usable after the high temperature sterilization to transparent cover and filter component device simultaneously, avoid discarding the back and cause secondary pollution, also greatly reduced the wasting of resources of gauze mask, be favorable to the environmental protection. Through the cooperation of transparent cover, sign district, string rope for the second filter screen can dismantle according to user's service condition or number of times, and then is convenient for change the active carbon filter ball. However, the utility model also has the problems of complex structure, poor sealing performance, low antivirus efficiency, expensive unit price and the like.

Disclosure of utility model

The utility model aims to solve the first technical problem of providing a mask capable of preventing and controlling virus infectious diseases, which has the advantages of simple structure, convenient filter cloth replacement, good sealing performance and high virus prevention efficiency.

The second technical problem to be solved by the utility model is to provide the mask capable of preventing and controlling the virus infectious diseases, which is convenient to replace the filter cloth and has the adjustable tightness of the ear straps or the head bands and is capable of replacing the filter cloth.

The utility model solves the first technical problem of the mask, which adopts the technical proposal that the mask capable of changing filter cloth for preventing and controlling virus infectious diseases comprises a bracket, filter cloth and a headband or ear belt, wherein the bracket consists of an outer bracket and an inner bracket, the frame of the outer bracket is connected with the frame of the inner bracket through plug connection, the periphery of the inner bracket is provided with a leak-proof inner curled edge, or the periphery of the inner bracket is provided with a leak-proof sealing element made of high elastic material; or the sealing film edge sleeve which is made of high-elasticity materials and is used for preventing the side leakage of the inner and outer double brackets and the peripheral leakage of the mask face is arranged at the periphery of the inner and outer brackets; the filter cloth is positioned between the inner bracket and the outer bracket.

Among the various connection modes of the outer bracket and the inner bracket, the plug connection mode is preferable, because the connection mode is plug connection and split, the filter cloth is replaced, the operation is simpler and more convenient, and the filter cloth replacement speed is faster.

Further, the plugging mode is as follows: grooves integrated with the frames and convex strips corresponding to the grooves are respectively arranged on the frames of the inner and outer brackets; the groove is in interference fit with the convex strips. The convex strips are inserted into the grooves, and the inner support and the outer support are connected with each other. In addition, the periphery of the filter cloth is arranged in the groove, and then the convex strips are inserted into the groove, so that the inner and outer brackets can be connected, the filter cloth can be further fixed, and the side leakage phenomenon of the periphery of the double brackets can be effectively reduced or even avoided.

Further, the filter material is electrostatic filter cloth, impregnated carbon fiber felt, impregnated foam plastic sheet or washable fine fiber felt, etc. The electrostatic filter cloth has electrostatic adsorption effect, so that the electrostatic filter cloth has better and more effective filtration and adsorption effects on viruses. The impregnated carbon fiber felt and the impregnated foam plastic sheet filter material have the functions of moisture absorption, deodorization and the like besides dust prevention and toxicity prevention. The washable fine fiber felt is convenient for repeated washing, is repeatedly used, and is more effective in dust prevention.

Further, the electrostatic filter cloth is bare-edge electrostatic filter cloth. The bare edge electrostatic filter cloth is more favorable for clamping the electrostatic filter cloth between the frame of the outer support and the frame of the inner support, and particularly is favorable for arranging the edge of the electrostatic filter cloth in the groove for connecting the inner support and the outer support, so that gaps are avoided at the contact position of the bare edge (the non-woven fabric protective layers on the front and back edges) of the electrostatic filter cloth and the inner support and the outer support, and the sealing performance of the mask is further enhanced.

Further, the electrostatic filter cloth is ultra-low resistance high-efficiency electrostatic filter cloth with the thickness more than or equal to 0.1 mm; the high-efficiency electrostatic filter cloth is electrostatic filter cloth with the filtering efficiency of 99%, 99.9% and 99.97% respectively. The anti-virus effect of the mask reaches KN96, KN98 and near KN100 level respectively.

Further, the electrostatic filter cloth is formed by thin-point light thermal synthesis and is in the same shape as the mask support body. The electrostatic filter cloth adopts thin-point light thermal synthesis, so that the flexibility of the electrostatic filter cloth mask and the air tightness during face fitting can be improved.

Further, a non-woven fabric protective layer with the width of 0.5-3 cm is arranged on the periphery of the electrostatic filter cloth. By the design, the air tightness of the mask can be further improved.

Further, the inner bracket and the outer bracket are semi-football-shaped or bowl-shaped elliptic net-shaped brackets; or an elastically contractible stent.

Further, the sealing film limit cover is equipped with the great mouth nostril such design that corresponds with human mouth nostril when the gauze mask is worn, is favorable to increasing the gauze mask gas tightness, reduces the resistance of breathing in, the travelling comfort that the reinforcing gauze mask was worn.

Further, an air outlet valve (for patients with infectious diseases, no air outlet valve is provided for anti-virus discharge) is arranged on the bracket.

Furthermore, the cross sections of the ribs of the inner support and the outer support are in a water drop shape, and the filter cloth is lightly touched by waves, so that the suction resistance can be reduced.

Further, grooves and convex edges for fixing the periphery of the electrostatic filter cloth are formed in the periphery of the inner bracket and the periphery of the outer bracket; or a plurality of evenly distributed grooves and raised strips with the length of 4-20 mm (preferably 6-15 mm, more preferably 8-12 mm) for fixing the periphery of the electrostatic filter cloth are arranged. Or a plurality of concave-convex clamping grooves with the length of 2-20 mm which are uniformly distributed and used for fixing the periphery of the filter cloth are arranged;

further, a shutter cover for preventing rain and hemoptysis and splashing or a plastic film cover with an air inlet hole below is arranged on the outer support. The mask with the design is particularly suitable for being worn by people in the rainy season in the south and in medical care and the like during high-risk operation.

Further, the side leakage prevention sealing piece made of high-elasticity materials is a leakage prevention airtight elliptic diaphragm or a round sealing ring piece made of latex diaphragm or high-elasticity rubber or plastic diaphragm, or is a three-dimensional leakage prevention strip or leakage prevention groove or inflatable flat square thin hose made of airtight foam or rubber or plastic; the leakage-proof strip, leakage-proof groove, leakage-proof pipe, leakage-proof sheet or inner winding edge arranged on the periphery of the inner support is coated with leakage-proof skin care cream.

Further, the side leakage prevention sealing piece arranged at the peripheral face of the inner support is a leakage prevention strip, a leakage prevention groove, a leakage prevention pipe, a leakage prevention sheet or a leakage prevention skin care cream smeared on the leakage prevention inner winding edge. So as to further improve the air tightness of the mask.

Furthermore, the radian of the semi-rugby-shaped or bowl-shaped circular bracket is designed according to the data of 29 average radians of standard head type No. 7 of GB/T2428-1981 for men and women so as to fit the face shape of most Chinese people, thereby being beneficial to reducing side leakage.

Further, a lining moisture absorbing sheet for absorbing vapor and odor generated by breathing in the mask, reducing the rising of wet resistance of the mask and avoiding static electricity from disappearing is arranged between the outer support and the inner support or inside the inner support. This design may improve wearing comfort.

Further, the moisture absorption sheet is made of a foamed plastic sheet or a carbon fiber felt having a thickness of 2 to 8mm (preferably 3 to 5.0mm, more preferably 4.0 mm), a high aperture ratio, a high hygroscopicity, and a small resistance.

Further, the high elastic material is latex, high elastic rubber, plastic film or airtight high elastic chemical fiber thin cloth, airtight foam plastic, etc.

Further, the tip of the inner hemming of the inner bracket is provided with an inner hemming nose clip which can clamp two sides of the nose bridge, or a metal nose bridge strip is independently arranged. With this design, the air tightness can be further improved.

Further, the height and the width of the two sides of the inner curled nose clip are respectively 2-20 mm.

Further, the length of the metal nose bridge strip is 6-10 cm, and the width is 0.3-1 cm.

For the mask with the leak-proof inner curled edge at the periphery of the inner support, when the curled radian of the leak-proof inner curled edge corresponding to the two sides of the nose bridge is designed to be increased by 0.5-1.5 cm according to the specified radian of GB/T2428-1981, a metal nose bridge strip can be omitted.

The inner support and the outer support of the mask are preferably manufactured by injection molding of medical thermoplastic plastics respectively. The inner bracket (and the inner curled edge thereof, if the inner bracket is provided with the inner curled edge) and the outer bracket are connected by grooves and convex strips which are integrally injection-molded with the relevant inner bracket and the outer bracket.

The second technical problem of the utility model is solved by adopting the technical proposal that the headband or the ear belt is provided with a headband or ear belt tightness adjusting mechanism for adjusting the wearing tightness of the mask.

Further, the headband or ear belt tightness adjusting mechanism is a backstop adjusting piece or a backstop adjusting hook.

Further, the non-return adjusting piece is a double-hook double-hole non-return adjusting piece or a double-hole non-return adjusting piece.

Further, the ear strap is provided with a backstop adjusting hook. The ear belt can be changed into a head belt with adjustable wearing tightness by additionally arranging a backstop adjusting hook. Therefore, the two side ear belts can be conveniently changed into the head belts with adjustable wearing tightness, the adaptability and the anastomotic property of the mask to different head types are enhanced, and the wearing tightness of the mask can be conveniently adjusted. The ear strap is convenient to use when worn in areas without infectious disease risk.

Further, the width of the ear band or headband is 0.4 to 1.6cm (preferably 0.5 to 0.8 cm). A slightly wider width of the ear strap or headband is advantageous for enhanced wear comfort and reliability.

The utility model has the following beneficial effects: (1) The support is designed to be composed of an inner support and an outer support, the inner support and the outer support are convenient to insert, disassemble and install, and the filter cloth is convenient to replace naturally; the filter cloth wrapped in the middle of the double brackets is also easy to detach and replace, and can be reused after replacement, and the planar mask with the lowest total price is used; if the filter cloth is in shortage, hot air (preferably about 70 ℃) can be used for blowing for 20 minutes or ozone or chlorine dioxide and other gases which can be sterilized by 100% are used for irradiating for 1 minute, the used filter cloth is sterilized, and the filter cloth can be reused after being subjected to static electricity regeneration; if used correctly, the electrostatic filter cloth can be reused for up to ten times; (2) The connection of the inner and outer brackets can be selected in various ways: for the filter cloth with different grades and thicknesses, the latex membrane sleeve is generally preferably connected in a sleeving and fixing mode or an inserting mode, and the filter cloth can be conveniently inserted into the connecting groove in the connecting mode and is clamped by the inner bracket and the outer bracket; because the width of the groove is limited, the ultra-low resistance filter cloth with special thickness is difficult to smoothly insert into the connecting grooves of the inner bracket and the outer bracket, and at the moment, the inner bracket and the outer bracket are tightly sleeved into a whole by using the sealing film edge sleeve, so that the basic side leakage and high air tightness can be ensured; (3) The preferable scheme is that the latex leakproof membrane sleeve is sleeved on the periphery of the bracket or the latex membrane is glued on the outer or inner bracket by one-time thermal synthesis, so that the faced leakproof membrane has high elasticity and is very easy to be matched with different fat and thin facial forms of people of all ages and both sexes; when the latex film with slight viscosity is selected to manufacture the leakage-proof film sleeve, the air tightness is better; the high-elastic rubber or plastic film sleeve or other high-elastic material film sleeve and the leak-proof latex film sleeve can be replaced with each other; the periphery of the inner bracket is extended inwards to form a leak-proof inner curled edge or be stuck with a leak-proof sheet such as a latex membrane, a leak-proof strip, a leak-proof groove and a leak-proof pipe, so that the processing is simple and the cost is low; the operation with high risk can be further carried out by coating a layer of sticky leak-proof skin care cream on the leak-proof sheet, the leak-proof strip or the leak-proof pipe before use, so that the leak-proof effect can be further enhanced, no leakage is ensured, and the level of N100 is reached. When the filtration efficiency of the modified filter cloth is more than or equal to 99.97%, the virus-proof efficiency of the mask is as high as near N100 level; (4) The size of the support is not changed, filter materials with different thicknesses can be easily clamped so as to adapt to the operation with different protection requirements, namely, various filter materials with different thicknesses and different protection performances can be respectively clamped between the inner support and the outer support without changing the support, namely, 1 mask can be respectively used for the operation with different levels of risk areas with different protection requirements only by selecting electrostatic filter cloth or other dustproof and gasproof filter materials with different levels of filtration effects; (5) When the high elastic membrane leakage-proof ferrules such as latex films and the like are used as leakage-proof sealing pieces, concave-convex grooves can be omitted at the peripheral edges of the inner bracket and the outer bracket, and only 1-2 circles of concave-convex ribs are respectively added at the periphery of the inner bracket and the outer bracket for clamping filter cloth; a circle of convex ribs can be additionally arranged at the corresponding positions around the periphery of the outer bracket to prevent the latex film sleeve ring from slipping off, or the latex film sleeve ring is directly adhered around the outer bracket or the inner bracket, so that the manufacturing and the processing are simpler and more convenient; (6) The tip of the outer bracket is provided with a bracket type large convex inner curled nose clip which can clamp two sides of the nose bridge, or a metal nose bridge strip is independently arranged, so that the side leakage can be prevented more effectively, and the air tightness is better; (7) The moisture absorbing sheet which is used for absorbing the moisture and the odor generated by the breathing in the mask, reducing the rising of the wet resistance of the filter material and avoiding the disappearance of static electricity of the filter material is arranged in the inner bracket, so that the moisture and the odor generated by the breathing in the mask can be absorbed, the rising of the air suction resistance of the filter material is reduced, the static electricity of the filter material is avoided, the wearing comfort is good, and the using validity time of the mask is prolonged; (8) In the preferred scheme, the cross sections of the ribs of the inner and outer brackets are in a water drop shape, the wave type lightly touches the filter cloth, the air suction resistance is small and soft, and the ribs are easy to fit with different facial forms of men, women, old and young of Chinese.

The design is that the anti-leakage inner hemming of the mask and the inner hemming nose clips on the two sides of the nose are designed according to national standard GB2428-1981, the modeling size, radian and elasticity of the nose clips, the degree of strain fit of different facial forms, the electrostatic force of pressure combined electrostatic filter cloth, the shrinkage force of the mask support, the optimal force points and the tensile force of 4 head straps on the mask edge and the like are comprehensively and optimally matched, so that the optimal comfort level of the mask during long-time wearing is ensured under the condition of always keeping the optimal stability and the optimal air tightness of the mask is ensured, and the KN 99' virus transmission control of the ultra-low resistance three-dimensional thick electrostatic filter cloth special for patients and suspected patients is a breakthrough.

In summary, compared with the mask with the same type of anti-infectious disease, the mask is the safest mask with the lowest total use cost, the lowest rising rate of resistance and wet resistance, the smallest total leakage and the anti-virus efficiency up to KN99 and near KN100 grade at present; because the three-dimensional thick filter cloth has small resistance, the mask for controlling virus transmission can be made into a mask specially used for infectious patients to wear, which is greatly beneficial to accurately preventing and controlling epidemic of infectious diseases.

Drawings

Fig. 1 is a schematic structural diagram of embodiment 1 of the present utility model.

FIG. 2 is an enlarged schematic view of the single hole check tab of the headband in the embodiment of FIG. 1.

Fig. 3 is an enlarged schematic view of a headband tightness double-hole backstop adjusting sheet according to an embodiment of the present utility model.

Fig. 4 is a schematic structural diagram of embodiment 2 of the present utility model.

Fig. 5 is a schematic view of an ear band backstop adjusting hook used by changing an ear band into a headband in the present utility model.

Fig. 6 is a schematic structural view of a headband tightness mutually-extruded double-hole non-return adjusting piece of the mask provided by the utility model.

Fig. 7 is a schematic view of another structure of a headband tightness double-hole backstop adjusting piece of the mask of the present utility model arranged at two ends of a headband.

Fig. 8 is a schematic view of an inner support structure without inner hemming and shrinkage function of the mask of the present utility model.

Fig. 9 is a schematic view of a retractable frame with a metal nose bridge clip and a narrow leak-proof inner curled edge for a mask according to the present utility model.

Fig. 10 is a schematic view of a collapsible support structure with a wide leak-proof inner curled nose clip and a chin pocket for an inner curl of a mask according to the present utility model.

FIG. 11 is a sectional view at E-E of FIG. 10.

FIG. 12 is a schematic view of another collapsible stent with broad leakage-proof latex membrane bands.

Fig. 13 is a schematic view of the shape of a side leakage wide seal leakage preventing strip made of a highly elastic material provided at the peripheral face of the inner frame.

Fig. 14 is a schematic view of the shape of a side leakage prevention seal leakage prevention groove made of a highly elastic material provided at the peripheral face of the inner bracket.

Fig. 15 is a schematic view of the shape of a side leakage prevention seal leakage prevention tube made of a highly elastic material provided at the peripheral face of the inner bracket.

Fig. 16 is a schematic view of a plastic film rain cover with 4 small fixing holes.

Fig. 17 is a schematic view of a shutter type rain cover with 4 fixing holes.

Detailed Description

The present utility model will be described in further detail with reference to the accompanying drawings and examples.

Example 1

Referring to fig. 1-3, the embodiment comprises a double support 1.3 consisting of an outer support and an inner support, wherein the double support 1.3 is tightly covered by a latex membrane sleeve 4.1 which is provided with an oral nostril and has a side leakage preventing function; the inner side of the inner bracket is provided with a lining moisture absorbing sheet which is used for absorbing vapor and odor generated by breathing in the mask, reducing the rising of the wet resistance of the mask and avoiding the disappearance of static electricity; the two sides of the double support 1.3 are respectively provided with an upper headband 5.1 and a lower headband 5.2; one side of the upper headband 5.1 is provided with a headband tightness single-hole non-return adjusting piece 3.1; the headband tightness single-hole non-return adjusting piece 3.1 can also be replaced by a double-hole non-return adjusting piece 3.2; the electrostatic filter cloth is fixed between an outer holder and an inner holder (shown in the figure).

The rate of rise of wet resistance in this example was only about 1/2 of that of a mask without a moisture absorbing sheet under the same conditions as that detected by the resistance detector.

Example 2

Referring to fig. 4-5, the present embodiment includes a double stent 1.3' consisting of an outer stent and an inner stent; the double-support 1.3 'is tightly sleeved and wrapped by a latex membrane sleeve with an nostril and a side leakage prevention function along with a 4.1' nostril which is slightly larger; s-shaped thin ribs 1.2 which are convenient for the contraction of the support are arranged in the middle of the inner support and the outer support; ear bands 5.3 are respectively arranged on two sides of the double brackets 1.3'; the ear belt 5.3 at one side is provided with an ear belt backstop adjusting hook 3.3; the electrostatic filter cloth 2 is sandwiched between an outer holder and an inner holder.

The middle of the inner bracket of the embodiment is slightly contractible.

Example 3

The difference between this embodiment and embodiment 1 is that the adjustment mechanism of the headband tightness is different: the headband tightness adjusting mechanism used in this embodiment is a headband tightness mutually-extruded double-hole non-return adjusting piece 3.4 (see fig. 6 for specific structure) arranged at two ends of a headband. By using the mutually-extruded double-hole non-return adjusting piece, two hands simultaneously pull the ends of 2 head bands, and the tightness of the head bands can be easily and once tensioned and adjusted.

Example 4

The difference between this embodiment and embodiment 1 is that the adjustment mechanism of the headband tightness is different: the headband tightness adjusting mechanism used in this embodiment is another headband tightness double-hole non-return adjusting piece 3.5 (see fig. 7 for specific structure) provided at both ends of the headband. The tightness of the headband with the non-return adjusting piece can be adjusted separately or simultaneously, and the two ends of the headband can be easily sleeved into or taken out from the holes of the double-hole non-return adjusting piece 3.5.

Example 5

This embodiment differs from embodiment 2 in that the inner stent is a non-collapsible, leak-proof, inner crimped plastic inner stent 1.4 (see fig. 8 for specific construction). The plastic inner bracket 1.4 is provided with a nose bridge clip 7.

Example 6

The difference between this embodiment and embodiment 2 is that the upper part of the inner support 1.4' is provided with a nose bridge clip 7 and with a slightly narrower leak-proof inner crimp (see fig. 8 and 9 for specific structure of the inner support).

Example 7

The difference between the embodiment and the embodiment 2 is that the inner bracket is provided with a jaw pocket 1.5 and a wide leak-proof inner curled edge 1.7; the chin pocket is connected with the wide leak-proof inner curled edge and the inner curled edge nose clip into a whole (the specific structure is shown in fig. 10 and 11). The design has the best leakage-proof effect.

Example 8

The difference between the embodiment and the embodiment 2 is that the inner bracket is provided with a wide leak-proof inner curled edge 1.8 with a jaw pocket, and the sealing effect is better; the middle part of the inner bracket is provided with Z-shaped thin ribs, so that the bracket is convenient to be pressed and easy to shrink; the tip of the inner bracket is provided with an inner curled nose clip which can clamp two sides of the nose bridge, and a separately arranged metal nose bridge clip is omitted (see fig. 12 for a specific structure).

Example 9

The difference between this embodiment and embodiment 1 is that the outer bracket is further provided with a plastic film rain-proof cover 10, and the plastic film rain-proof cover is provided with 4 fixing holes, and the 4 fixing holes are sleeved on the 4 protruding columns of the outer bracket (the shape and structure of the plastic film rain-proof cover are shown in fig. 16).

Example 10

The difference between this embodiment and embodiment 1 is that the outer bracket is further provided with a shutter type rain-proof cover, the shutter type rain-proof cover is provided with 4 fixing holes, and the 4 fixing holes are sleeved on the 4 protruding columns of the outer bracket (the shape structure of the shutter type rain-proof cover is shown in fig. 17).

The components in the above-described embodiments, such as the headband tightness single-hole check adjusting piece, the headband tightness double-hole check adjusting piece, the ear band check adjusting hook used by the headband instead of the ear band check adjusting piece, the headband tightness mutually-extruded double-hole check adjusting piece, the headband tightness double-hole check adjusting piece, and the side leakage prevention sealing piece made of high elastic material, such as the leakage prevention strip 4.2, the leakage prevention groove 4.3, the leakage prevention pipe 4.4, and the plastic film rain-proof cover 10, the shutter type rain-proof cover, and the inner support, the outer support, etc. of different structures, may be variously combined without being limited by the described embodiments. Various modifications and combinations can be made without departing from the basic idea of the utility model, and the modifications and combinations belong to the protection scope of the patent.

The present application is not described or illustrated in detail in the specification, and belongs to common general knowledge of a person skilled in the art.

Claims (17)

1. The mask capable of replacing the filter cloth for preventing and controlling the virus infectious diseases comprises a support, the filter cloth and a headband or an ear strap, and is characterized in that the support consists of an outer support and an inner support, wherein the frame of the outer support is connected with the frame of the inner support through plug connection, the periphery of the inner support is provided with a leak-proof inner curled edge, or the periphery of the inner support is provided with a leak-proof sealing piece made of a high-elasticity material; or the sealing film edge sleeve which is made of high-elasticity materials and is used for preventing leakage between the two brackets and at the face is arranged at the periphery of the inner bracket and the outer bracket; the filter cloth is positioned between the inner bracket and the outer bracket; the support is an elastically contractible support.

2. The mask for preventing and controlling viral infectious diseases with replaceable filter cloth according to claim 1, wherein the plugging mode is as follows: grooves integrated with the frames and convex strips corresponding to the grooves are respectively arranged on the frames of the inner and outer brackets; the groove is in interference fit with the convex strips.

3. The mask for preventing and controlling viral infectious diseases, according to claim 1, wherein the filter cloth is an electrostatic filter cloth, a impregnated carbon fiber felt, a impregnated foam plastic sheet or a washable fine fiber felt.

4. A mask for preventing and controlling viral infectious diseases, which is provided with a replaceable filter cloth according to claim 3, wherein the electrostatic filter cloth is a bare-sided electrostatic filter cloth.

5. The mask for preventing and controlling viral infectious diseases with replaceable filter cloth according to claim 3, wherein the electrostatic filter cloth is ultra-low resistance high-efficiency electrostatic filter cloth with thickness of 0.2-6 mm, and the high efficiency is electrostatic filter cloth with the filtering efficiency of 99.00-99.97% according to risk degree.

6. A mask for preventing and controlling viral infectious diseases, which is characterized in that the electrostatic filter cloth is a homomorphic electrostatic filter cloth which is synthesized by light heat at a thin point and is adapted to the shape of a mask bracket body.

7. A mask for preventing and controlling viral infectious diseases by replacing filter cloth according to claim 3, wherein the periphery of the electrostatic filter cloth is removed with a non-woven protective layer having a width of 0.5-3 cm.

8. A cloth replaceable virus infection prevention mask according to any one of claims 1 to 7 wherein the inner and outer supports are semi-football shaped or bowl shaped oval mesh supports.

9. The filter cloth replaceable mask for preventing and controlling viral infectious diseases according to any one of claims 1 to 7, wherein the cross sections of the ribs of the inner bracket and the outer bracket are in a water drop shape.

10. The mask for preventing and controlling viral infectious diseases according to any one of claims 1 to 7, wherein the periphery of the outer bracket is further provided with a groove for fixing the periphery of the filter cloth and a convex edge corresponding to the groove; or a plurality of concave-convex clamping grooves with the length of 2-20 mm which are uniformly distributed and used for fixing the periphery of the filter cloth are arranged; the sealing film is sleeved with nostrils corresponding to nostrils of a human body when the mask is worn.

11. A cloth replaceable virus infection prevention mask according to any one of claims 1 to 7 wherein said side leakage prevention seal made of highly elastic material is a leakage prevention oval membrane or circular gasket made of latex membrane or highly elastic rubber, plastic membrane, or a three-dimensional leakage prevention strip or leakage prevention groove or inflatable flat square thin hose made of air-impermeable foam or rubber or plastic; the leak-proof strip, leak-proof groove, leak-proof pipe, leak-proof membrane or inner winding edge arranged on the periphery of the inner bracket is coated with leak-proof skin care cream.

12. The mask for preventing and controlling viral infectious diseases by replacing filter cloth according to any one of claims 1 to 7, wherein a louver cover for preventing rain and hemoptysis splashing or a plastic film cover with an air inlet hole is arranged below the outer bracket.

13. The mask for preventing and controlling viral infectious diseases with replaceable filter cloth according to any one of claims 1 to 7, wherein a moisture absorbing sheet for absorbing vapor and odor generated by respiration in the mask, reducing the rise of resistance of filter materials and avoiding the disappearance of static electricity of the filter materials is arranged between the inner support and the outer support or inside the inner support; the thickness of the moisture absorption sheet is 2-8.0 mm, and the moisture absorption sheet is made of a foam plastic cover or a carbon fiber felt with high aperture ratio, high moisture absorption and small resistance; the high-elasticity material is latex, high-elasticity rubber, plastic film, airtight high-elasticity chemical fiber thin cloth or airtight foam plastic.

14. The mask for preventing and controlling viral infectious diseases according to claim 13, wherein the thickness of the moisture absorption sheet is 3-5.0 mm.

15. The filter cloth replaceable mask for preventing and controlling viral infectious diseases according to claim 14, wherein the thickness of the moisture absorption sheet is 4.0-4.5 mm.

16. The mask for preventing and controlling viral infectious diseases by replacing filter cloth according to any one of claims 1 to 7, wherein an inner curled nose clip capable of clamping two sides of a nose bridge is arranged at the tip of the inner bracket, and the height and width of the two sides of the inner curled nose clip are respectively 2-20 mm; or a metal nose bridge strip is arranged independently; the length of the metal nose bridge strip is 6-10 cm, and the width is 0.3-1 cm.

17. The filter cloth replaceable virus infection prevention and control mask according to any one of claims 1 to 7, wherein the headband or the ear belt is provided with a headband or ear belt tightness adjusting mechanism for adjusting the wearing tightness of the mask; the headband or ear belt tightness adjusting mechanism is a backstop adjusting piece or a backstop adjusting hook; the non-return adjusting piece is a double-hook double-hole non-return adjusting piece or a double-hole non-return adjusting piece; the width of the ear belt or the head belt is 0.4-1.6 cm.