CN114849096A - Protective mask and electric air purifying respirator with same - Google Patents

Abstract

The invention relates to a low-cost protective mask and a power-driven air purifying respirator equipped with the same. The mask includes a transparent flexible first sheet, a second sheet, an adjustment structure, and a support structure. The support structure comprises a visor and a cap body. The adjustment structure may be used to adjust the fit of the mask to the face of the wearer. The air purifier comprises a turbine fan and a filtering component, and is compact in structure and small in size. The electric air purifying respirator has the advantages of light weight, low manufacturing cost, low leakage rate and convenient wearing and use.

Description

Protective mask and electric air purifying respirator with same

Technical Field

The invention particularly relates to a low-cost protective mask and a power-driven air purifying respirator with the same.

Background

In high-risk places containing high-concentration dust, harmful gas, germs, and the like, a powered air-purifying respirator (PAPR) is widely used. The PAPR consists of an electric air cleaner and a breathing protective mask (a mask, a half mask, a full mask, a hood, an isolation suit, etc.). The electric air purifier filters air through the filtering component, and the filtered air is pressurized and then sent to the breathing protective cover through the electric air supply component, and a certain positive pressure value is kept inside the breathing protective cover relative to the outside. Compared with the traditional self-suction respirator or breathing mask, the PAPR not only can overcome the resistance generated during air filtration, but also can reduce the breathing burden of a user; and under the same conditions, the specified protection factor of the PAPR is about 10-50 times that of the self-suction respirator.

The PAPR has high protection level, but the conventional PAPR has larger volume, heavier weight, inconvenient carrying and wearing and high price. CN102811772A discloses a powered air purifying respirator, which comprises an air purifying assembly (including a fan, a filter box and a battery) and a head cover, and can provide protection for the whole face, but the air purifying assembly of the respirator is heavy, and usually weighs more than 1 kg. CN105169826A provides a portable air purifier. The air purifier integrates the electric blower and the filtering component into a whole, and has compact structure and light weight; however, the air purifier is small in fan, the air volume is much smaller than that of a professional PAPR, the air purifier needs to be used with a special mask, the leakage rate is high (generally more than 1%), the positive pressure protection effect is far inferior to that of the professional PAPR, and the air purifier is only suitable for common dust prevention and haze prevention.

CN102958571 discloses a full-face mask type PAPR, in which the air purification component is in the full-face mask, but the structure is complex, the cost is high, the whole air purification component (including blower, filter box and battery) is integrated in the full-face mask, the weight is heavy, the burden on the head of the user is increased, and in addition, it is inconvenient to replace the battery and the filter material. CN111165965A discloses an air purification protective face mask, included the cap body, protective face mask, protection scarf, fan and air cleaner, but the structure is also more complicated, and the fan is the little axial fan of wind pressure, and the face mask below is not sealed, has not formed effectual malleation protection.

In general dust-proof or virus-proof situations, especially in daily epidemic prevention, there is a need for a more portable, more economical, more convenient to use, more comfortable to wear, and at the same time, a protective product with a high protection factor (low leakage rate), including air purifiers, face masks, and PAPRs.

Disclosure of Invention

It is an object of the present invention to overcome the above-mentioned deficiencies of the prior art and to provide a low cost protective face mask and powered air purifying respirator equipped therewith.

The electric air purifying respirator comprises the face mask and an air purifier.

The electric air purifying respirator has the advantages of compact structure, low cost, light weight, comfortable wearing and low leakage rate.

In one aspect of the present invention, a low cost face mask for a PAPR is provided, the face mask comprising a first sheet of material, a second sheet of material, an adjustment structure, and a support structure; the supporting structure comprises a brim and a cap body; the first sheet material is flexible, transparent, and impermeable; the second sheet is flexible, pliable; the lower end edge of the first sheet and the lower end edge of the second sheet are superposed and joined together; the upper end edge of the first sheet is connected with the front end of the brim; the second sheet is arranged on one surface of the first sheet facing the head of a wearer; the support structure holding the mask fixed to the wearer's head; the adjustment structure and the upper end edge of the second sheet are connected together; the left end and the right end of the adjusting structure are connected with the left side edge and the right side edge of the first sheet material; the length of the adjustment structure may be adjusted to maintain the adjustment structure against the head of the wearer when worn.

In one embodiment of the invention, the adjustment structure comprises an adjustment cord and a sleeve; the adjusting rope is wrapped by the sleeve; the left side edge and the right side edge of the first sheet are respectively provided with a limiting hole; two ends of the adjusting rope respectively penetrate through the two limiting holes; the limiting holes limit sliding of the adjusting ropes, so that the length of the adjusting structure can be adjusted by changing the length of the adjusting ropes between the two limiting holes.

In one embodiment of the invention, the adjustment structure is elastic.

In one embodiment of the invention, the adjustment cord is elastic.

In one embodiment of the invention, the sleeve is formed by folding the upper end edge of the second sheet.

In one embodiment of the invention, the adjustment structure comprises an elastic strip; the elastic strip is stretched when worn, generating a contractive force so that the adjustment structure abuts against the wearer's head.

In one embodiment of the invention, the first sheet, the second sheet, the adjustment structure and the visor, when worn, form an enclosed area around the wearer's face.

In one embodiment of the invention, the left and right edges of the first sheet, the adjustment structure and the cap are adapted to abut against the head of the wearer when worn.

In one embodiment of the invention, the front end of the cap peak is provided with a sheet fixing frame; the outer side surface of the sheet fixing frame is provided with at least two fixing buckles; the upper end edge of the first sheet is provided with at least two fixing holes; the first sheet is connected to the front end of the visor by buckling the fixing hole with the fixing buckle on the sheet fixing frame.

In one embodiment of the invention, the upper end edge of the first sheet is curved.

In one embodiment of the invention, the lower end edge of the first sheet and the lower end edge of the second sheet are superposed and joined together by one or a combination of gluing, sewing, stitching, stapling, hemming or welding.

In one embodiment of the present invention, the first sheet is one of polyethylene terephthalate (PET), polyvinyl chloride (PVC), Polycarbonate (PC), preferably PET.

In one embodiment of the present invention, the thickness of the first sheet is between 0.1 and 2mm, preferably between 0.2 and 1 mm.

In one embodiment of the present invention, the second sheet material is one or more of a fiber fabric and a high polymer film.

In one embodiment of the present invention, the fiber fabric is one of a polypropylene spun-bonded nonwoven fabric, a polyester fiber fabric, a polyurethane fiber fabric, and a polyamide fiber fabric.

In one embodiment of the present invention, the high polymer film is one of a Polyethylene (PE) film, a polypropylene (PP) film, a Thermoplastic Polyurethane (TPU) film, a polyvinyl chloride (PVC) film, and an ethylene-vinyl acetate copolymer (EVA) film.

In one embodiment of the present invention, the second sheet is one of a polypropylene spunbond/PE film composite nonwoven fabric, a polypropylene spunbond/meltblown/spunbond composite nonwoven fabric (SMS), a polypropylene spunbond/meltblown/spunbond composite nonwoven fabric (SMMS), a pongee coated TPU film composite material, and a pongee coated PE film composite material.

In one embodiment of the invention, a reinforcing structure is provided at the interface of the lower end edge joining region and the respective separation region of the first and second sheets to prevent the joining region from being peeled off.

In one embodiment of the invention, the reinforcing structure is one or more of a snap fastener, a rivet, and a suture.

In one embodiment of the invention, the reinforcing structure is a snap fastener, and the mask can be buckled after being folded left and right, so that the mask is convenient to carry.

In one embodiment of the present invention, two elastic pieces are connected to both sides of the upper end of the first sheet, respectively, to enhance air-tightness when worn.

In one embodiment of the invention, the mask is provided with a mask air inlet.

In one embodiment of the invention, the mask air inlet opens onto the visor.

In one embodiment of the invention, the mask is provided with a mask outlet.

In one embodiment of the invention, the visor is crescent shaped.

In one embodiment of the invention, the cap comprises a ferrule and a cap adjustment assembly; the front end of the hat hoop is connected with the rear end of the hat brim; the rear end of the cap hoop is connected with the cap body adjusting component; the cap body adjusting component can adjust the circumference of the cap body.

In one embodiment of the invention, the headgear includes a band, a crown, and a headgear adjustment assembly; the front end of the hat hoop is connected with the rear end of the hat brim; the rear end of the cap hoop is connected with the cap body adjusting component; the cap body adjusting component can adjust the circumference of the cap body; the inner surface of the lower end of the crown is connected to the outer surface of the band.

In one embodiment of the present invention, the cap body comprises a cap band, a visor bracket, a hinge shaft, and a cap body adjusting assembly; the front end of the brim support is connected with the rear end of the brim; the rear end of the cap hoop is connected with the cap body adjusting component; the cap body adjusting component can adjust the circumference of the cap body; the left side and the right side of the hat hoop are connected with the left side and the right side of the rear end of the hat brim support through the hinge shaft; the curves of the inner side surface of the brim support and the outer side surface of the front end of the hat hoop are similar, so that the brim support and the hat hoop are close to each other when the hat is worn.

In one embodiment of the invention, the visor support and the visor are integrally formed.

In an embodiment of the present invention, the cap body adjusting component is one of an elastic band, a magic tape, an adjusting button, and an adjusting knob.

The face mask can be used not only as a face mask of a power air purifying respirator, but also as a face mask of other types, such as a cylinder type positive pressure respirator, a long tube type respirator.

When the second sheet material is made of a material which is breathable and has filtering performance, such as melt-blown fabric, the mask can be independently used, has the same function as a mask, and has better performance than a KN95 mask.

In another aspect of the invention, an economical portable powered air purifying respirator is provided that includes an air purifier and a facepiece of the present invention.

In one embodiment of the present invention, the air cleaner is provided with an air outlet; and the air outlet of the air purifier is connected with the air inlet of the mask.

In one embodiment of the invention, the air purifier comprises an air supply purification unit and a power supply; the air supply purification unit comprises a turbine fan and a filtering component.

In one embodiment of the invention, the turbo fan and the filter assembly are contained within a single housing; the shell is provided with an air inlet and an air outlet; the shell comprises a base, an inner cover and an outer cover; a first cavity is arranged between the base and the inner cover; the first cavity accommodates the turbine fan and is provided with a ventilation opening and an air outlet; the ventilation opening is formed in the inner cover; a second cavity is arranged between the inner cover and the outer cover; the second cavity is used for accommodating the filtering component and is communicated with the outer side of the shell through the air inlet.

In one embodiment of the invention, elastomeric sealing gaskets are provided between the filter assembly and the inner cover and between the filter assembly and the outer cover.

In one embodiment of the invention, the supply air cleaning unit comprises at least one filter assembly; the turbo fan is provided with a fan air outlet and at least one fan air inlet; the filter assembly is arranged on the outer side of the air inlet of the fan; the back surface of the filter assembly covers the air inlet of the fan; one side of the fan air inlet of the turbofan and the back of the filter assembly are tightly combined together through a fastening assembly, so that when the turbofan runs, outside air can only pass through the filter assembly and then enter the turbofan through the fan air inlet.

In one embodiment of the present invention, the fastening component is one or a combination of several of an elastic ring, a hoop, a ribbon, an adhesive tape, a double-sided adhesive tape and a hot melt adhesive, and the elastic ring is preferred.

In one embodiment of the invention, a resilient sealing gasket is provided between the turbo fan and the filter assembly.

In one embodiment of the invention, the fastening assembly comprises at least two elastic rings, and the elastic rings are wound around the left side and the right side of the turbo fan to bind the turbo fan and the filter assembly together so that the turbo fan and the filter assembly are in close fit.

In one embodiment of the present invention, at least two notches are respectively disposed on left and right side edges of the back surface and/or the front surface of the turbofan, so as to limit sliding of the elastic ring.

In one embodiment of the invention, the turbofan includes two air intakes, wherein one of the air intakes may be temporarily sealed so that the turbofan is converted into a single air intake turbofan.

In one embodiment of the invention, the power supply and the supply air cleaning unit are separate and are connected by a wire.

In one embodiment of the invention, the power source comprises a rechargeable battery.

In one embodiment of the invention, the power source is a mobile power source.

In an embodiment of the present invention, a control assembly is disposed on the wire, the control assembly includes a switch unit and/or a speed regulation unit, the switch unit can control the opening and closing of the turbofan, and the speed regulation unit can control the rotation speed of the turbofan.

In one embodiment of the invention, the filter component is one or more of a high efficiency air filter, an electrostatic filter, a filter cotton, a filter paper, a filter cloth or activated carbon.

In one embodiment of the invention, the filter assembly includes an outer frame and a filter element.

In one embodiment of the invention, the front and/or back of the outer frame of the filter assembly is annular.

In one embodiment of the invention, the resilient sealing gasket is annular.

In one embodiment of the present invention, the front and/or back of the outer frame of the filter assembly is a square ring shape; the elastic sealing washer is in a square ring shape.

In one embodiment of the present invention, the air supply purification unit is disposed above the visor.

In one embodiment of the present invention, the air outlet of the air cleaner is protruded and directly inserted into the air inlet of the mask.

In one embodiment of the present invention, the air outlet of the air purifier is connected to the air inlet of the mask through an air duct.

In one embodiment of the present invention, the rated voltage of the turbo fan ranges from 3V to 24V, preferably from 5V to 12V.

In one embodiment of the present invention, the rated power of the turbo fan is in the range of 0.5W to 5W, preferably 1W to 3W.

In one embodiment of the present invention, the rotation speed of the turbo fan ranges from 2000 rpm to 9000rpm (revolutions per minute), and preferably ranges from 3500 rpm to 6000 rpm.

Compared with the prior art, the invention has the obvious advantages and beneficial effects that:

1) the mask comprises a unique adjusting structure, so that the air tightness of the mask is enhanced, and the manufacturing cost is reduced.

2) The supporting structure of the mask adopts a simple brim and a cap body, so that the cost and the weight are greatly reduced.

3) The first sheet material of the mask is replaceable, so that the use cost is saved.

4) The air purifier has the advantages of simple structure, low cost, light weight and portability.

5) The unique structural design of the air purifier facilitates the replacement of the filter assembly and the battery.

6) The power supply and the air supply purification unit adopt a separation mode, so that the weight of the air supply purification unit is reduced, and the pressure above the forehead of a wearer is reduced; since the battery is replaceable, the weight of the battery can be reduced.

7) The control assembly is arranged on the lead, so that the wearer can control the fan to be started and regulate the speed conveniently.

8) The electric air purifying respirator has simple integral design and greatly reduced manufacturing cost.

9) The electric air purifying respirator is light in weight, and the wearing comfort is greatly improved.

10) The mask and the air purifier adopt a separation mode, the mask can be used as a disposable mask and can be repeatedly sterilized or cleaned, the air purifier can be repeatedly used, and the separation design is convenient for sterilization and cleaning and reduces the use cost.

11) The leakage rate of the electric air purifying respirator is lower than 1%, the leakage rate of most of the embodiments is lower than 0.2%, and the protection effect on viruses and dust can be greatly improved.

To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It is noted that the drawings may not be to scale for clarity of illustration and that this does not detract from the understanding of the invention. The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.

Drawings

FIG. 1 is a front perspective view of a powered air purifying respirator of a first embodiment;

fig. 2 is an inside view of the mask lay-flat (without support structure) of the first embodiment;

FIG. 3 is a side perspective view of the mask of the first embodiment;

FIG. 4 is a bottom perspective view of the mask of the first embodiment;

FIG. 5 is a front bottom perspective view of the support structure of the first embodiment;

FIG. 6 is a side perspective view of the support structure of the first embodiment;

FIG. 7 is a perspective view of the supply air cleaning unit and air duct of the first embodiment;

FIG. 8 is an exploded view of the supply air cleaning unit of the first embodiment;

fig. 9 is a side sectional view of the air supply purification unit of the first embodiment;

FIG. 10 is a front perspective view of a powered air purifying respirator of the second embodiment;

FIG. 11 is a front perspective view of the supply air purification unit and air duct of the second embodiment;

FIG. 12 is an exploded view of the supply air cleaning unit of the second embodiment;

FIG. 13 is a rear perspective view of a turbofan of the second embodiment;

FIG. 14 is a front perspective view of a powered air purifying respirator of the third embodiment;

FIG. 15 is a front perspective view of the support structure of the third embodiment;

FIG. 16 is a front perspective view of a powered air purifying respirator of the fourth embodiment;

FIG. 17 is a front perspective view of a powered air purifying respirator of the fourth embodiment (after rotation, without power supply and wires);

FIG. 18 is a front perspective view of the support structure (after rotation) of the fourth embodiment;

the attached drawings are as follows:

1. electric air purifying respirator 2, face mask 3 and air purifier

4. Air supply purification unit 5, air duct 21, first sheet material

211. Fixing hole 212, limiting hole 213 and reinforcing structure

214. Edge wrapping tape 2141, edge wrapping sewing thread 2142, and edge of edge wrapping tape

215. Rivet 22, second sheet 23, adjustment structure

231. Cannula 232, adjustment cord 233, plication

24. Supporting structure 241, brim 2411, sheet mount

2412. Fixing buckle 2413, brim support 242 and cap body

2421. Hat hoop 2422, hat body adjusting component 2423 and hat crown

2424. Power supply support 2425, brim support 2426, articulated shaft

25. Mask cavity 251, flat cavity 26, mask air inlet

30. Casing 301, first cavity 302, second cavity

303. Base 3031, recess

304. Inner cover 3041, vent 3042, and first elastic seal gasket

305. Outer cover 3051, protrusion 3052, second elastic sealing washer

306. Air inlet 307, air outlet 3081 and hinge

3082. Buckle 309, power source 31, turbofan

311. Front 312 of fan, front air inlet 313 and fan air outlet

314. Fan back 315, back air inlet 32 and filter assembly

33. Power supply 34, power connection line 341 and control assembly

42. Fastening assembly 421 and elastic ring

43. Front elastic sealing gasket 44, notch 45 and back elastic sealing gasket

51. Back cover plate 52, back vent 53, and baffle plate

61. Elastic strip 62, connecting seam 63 and connecting point

Detailed Description

Term(s) for

In the description of the present invention, it should be noted that the terms "upper end", "lower end", "front end", "rear end", "left side", "right side", "inner side", "outer side", "front side", "back side", "above", "below", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

As used herein, the term "medial side" refers to the side that faces the head of the wearer when worn.

As used herein, the term "upper end" refers to the end that, when worn, is near the top of the wearer's head.

As used herein, the term "lower end" refers to the end opposite the upper end when worn.

As used herein, the term "front end" refers to the end of the wearer that is directly in front of the face when worn.

As used herein, the term "posterior end" refers to the end opposite the anterior end when worn.

As used herein, the terms "left side of the mask" and "right side of the mask" refer to the side that, when worn, is closer to the left or right side of the wearer's face.

As used herein, the term "headgear" refers to an assembly for surrounding and tightly hooping a head.

As used herein, the term "filter assembly front face" refers to the side of the filter assembly that receives air.

As used herein, the term "filter assembly back" refers to the side that vents air from the filter assembly.

As used herein, the term "annular" refers to hollow-out in the middle, and may be circular, square, or irregular.

As used herein, the term "fan speed" refers to the speed of the fan at rated power without the filter assembly and air exit resistance.

As used herein, the term "fan front" refers to the side of the fan containing the fan outlet from which the fan wheel rotates counterclockwise as viewed.

As used herein, the term "fan back" refers to the side from which the fan wheel rotation is clockwise as viewed.

As used herein, the term "left side of the fan" refers to the side of the fan that is to the left of the outlet.

As used herein, the term "right side of the fan" refers to the side of the fan that is to the right of the air outlet.

The present invention is further explained below with reference to specific examples, which are not intended to limit the present invention in any way.

A first embodiment of the present invention provides a face shield and a portable, economical powered air purifying respirator equipped therewith. Fig. 1 to 9 show a specific structure of the first embodiment. As shown in fig. 1, the powered air purifying respirator 1 includes a face mask 2 and an air purifier 3. The structure of the mask 2 will now be described in detail with reference to figures 1 to 6.

The mask 2 comprises a first sheet 21, a second sheet 22, an adjustment structure 23 and a support structure 24, the support structure 24 comprising a visor 240 and a mask securing assembly 241. In this example, the first sheet 21 is a transparent flexible 0.3mm thick PET sheet and the second sheet 22 is a flexible shorn TPU film composite. If it is desired to increase the breathability of the mask, breathable composites of the SMS or SMMS type may be selected; if increased mask air-tightness is desired, a composite material comprising an air-impermeable polymeric membrane may be selected.

Figure 2 is an inside view of the mask lay-flat (without support structure) of the first embodiment. When laid flat, the first sheet 21 and the second sheet 22 are both flat, and have the same shape at their lower ends, and the lower end edge curves are superposed. The lower end edge of the first sheet 21 and the lower end edge of the second sheet 22 are overlapped and joined together, the edge-covering tape 214 covers the overlapped lower end edges of the first sheet 21 and the second sheet 22, and the edge-covering thread 2141 is sewn to join the two; the dashed line in the edge-wrapping band 214 in fig. 1 and 2 is edge-wrapping stitching 2141, and the curve immediately above the dashed line is edge-wrapping band 2142. The second sheet 22 is located on the side of the first sheet 21 facing the head of the wearer, i.e. on the inner side of the first sheet 21. In order to prevent the lower end edge connecting region of the first and second sheets 21 and 22 from being peeled off when worn, a reinforcing structure 213 is provided at the interface of the connecting region and the respective separation region of the first and second sheets 21 and 22. The reinforcing structure in this embodiment is a rivet. As shown in fig. 2 and 3, the first sheet 21 and the second sheet 22 are separated from each other at the upper end of the reinforcing structure 213, and are overlapped and connected together at the lower end edge of the reinforcing structure 213.

As shown in fig. 2, the upper end edge of the second sheet 22 is folded and sewn into a sleeve 231; the sleeve 231 may be folded from another sheet and then connected to the second sheet 22. The adjusting rope 232 penetrates through the sleeve 231 and is wrapped by the sleeve, the adjusting rope 232 of the embodiment is an elastic rope, the rope without elasticity can also be used as the adjusting rope, but the tightness between the adjusting structure 23 and the head is affected after the adjusting rope is worn, and the head movement is also affected; the sleeve can be changed into an elastic sleeve, and an inelastic rope is used as an adjusting rope, so that the adjusting function can be achieved. The left and right edges of the first sheet 21 are respectively provided with a limiting hole 212, two ends of the adjusting rope 232 respectively penetrate through the two limiting holes 212 on the first sheet 21, and the diameter of the limiting hole 212 is smaller than that of the adjusting rope 232, so that the limiting holes 212 can limit the sliding of the adjusting rope 232 when the adjusting rope 232 is stretched. After the two ends of the adjusting rope 232 are stretched towards the left side and the right side, the limiting holes 212 limit the sliding of the two ends of the adjusting rope 232, so that the length of the adjusting rope 232 between the two limiting holes 212 is smaller than the length of the first sheet 21 between the two limiting holes 212 when the first sheet is tiled, and the adjusting rope 232 generates a contraction force; the sleeve 231 is laid flat with a length greater than the straight distance between the two stopper holes 212 after the first sheet 21 is bent, and then the sleeve 231 is reduced in length by forming the wrinkles 233, as shown in fig. 3. When worn, the adjustment structure 23 is positioned immediately below the wearer's head, typically below the chin, and the stretching deformation of the adjustment structure 23 generates a contractive force to hold the adjustment structure 23 immediately below the wearer's head, while also holding the left and right edges of the first sheet 21 against the left and right sides of the wearer's head with the support structure 24. The fitting degree of the adjusting structure 23 and the head of the wearer is adjusted by changing the length of the adjusting string 232 between the left and right edges of the first sheet 21, i.e., the length between the two limiting holes 212.

As shown in fig. 1 to 4, the upper end of the first sheet 21 and the visor 240 are coupled together. Fig. 5 shows that the front end of the visor 240 is provided with an arc-shaped sheet fixing bracket 2411, and the outer side surface of the visor is provided with three fixing buckles 2412 which are in a buckle structure. The three fixing holes 211 and the three fixing buckles 2412 of the first sheet 21 are aligned and buckled, so that the first sheet 21 can be fixed on the sheet fixing frame 2411 to form an arc shape surrounding the face. The sheet holder 2411 is spaced from the front edge of the visor 240 for easy hand-held wearing.

Figures 5 and 6 show that support structure 24 includes bill 241 and cap 242, and cap 242 includes collar 2421, cap adjustment assembly 2422 and crown 2423. The front end of the hat band 2421 is connected with the rear end of the brim 241; the rear end of the cap hoop 2421 is connected with a cap body adjusting component 2422; the cap body adjusting component 2422 can adjust the circumference of the cap body; the inner surface of the lower end of crown 2423 and the outer surface of band 2421 are attached. In the present embodiment, the front end of the hat band 2421 and the rear end of the visor 241, the inner surface of the lower end of the crown 2423 and the outer surface of the hat band 2421 are all connected together by sewing; the cap body adjusting component 2422 is an elastic band. The cap 242 further has a power support 2424 for fixing and supporting the power supply 33.

When worn, the first sheet 21, the second sheet 22, the adjustment structure 23, and the bill 240 form an enclosed area around the wearer's face, i.e., the mask cavity 25 as shown in FIG. 3, wherein the first sheet 21 and the second sheet 22 are bent to form a flat cavity 251. When worn, the inner side surface of the front end of the cap band 2421, the left and right side edges of the first sheet 21 and the regulating structure 23 abut against the wearer's head. Air enters the mask cavity 25 from the mask air inlet 26 after being filtered and pressurized by the air purifier; when the face mask 2 and the wearer's head are not completely sealed, air is expelled from the face mask 2 at various leak points against the wearer's head; the mask may also be provided with a mask outlet, for example, a one-way breather valve may be provided on the first or second sheet or the visor, so that air in the mask cavity 25 may be exhausted to the outside through the one-way breather valve, but outside air cannot enter the mask cavity 25 through the one-way breather valve.

The structure of the air cleaner 3 will be described in detail with reference to fig. 1, 7 to 9. The air cleaner 3 includes an air supply cleaning unit 4 and a power supply 33, and the air supply cleaning unit 4 includes a turbo fan 31 and a filter assembly 32. Fig. 8 is an exploded view of the air supply purification unit 4 and the air duct 5 of the present embodiment, and fig. 9 is a side sectional view of the air supply purification unit 4 of the present embodiment, both of which show that the turbo fan 31 and the filter assembly 32 are housed in one case 30. The housing 30 is provided with an air inlet 306 and an air outlet 307. The housing 30 includes a base 303, an inner cover 304, and an outer cover 305. A first cavity 301 is provided between the base 303 and the inner lid 304. The first cavity 301 accommodates the turbo fan 31 and is provided with a vent 3041 and an air outlet 307; the vent 3041 opens on the inner lid 304. A second cavity 302 is disposed between the inner cover 304 and the outer cover 305, and the second cavity 302 accommodates the filter assembly 32 and communicates with the outside of the housing 30 through an air inlet 306. As shown in fig. 7, the air inlet 306 in this embodiment is composed of 6 rectangular holes.

To facilitate replacement of the filter assembly 32 and to enhance sealing, the cover 305 and base 303 are connected by two cylindrical hinges 3081 to facilitate opening and closing, and snap-fitting the cover 305 and base 303 by snap-fits 3082. In order to further enhance the air tightness of the second chamber 302, the lower end of the outer cover 305 is provided with a protrusion 3051 at the peripheral edge, the upper end of the base 303 is provided with a groove 3031 at the peripheral edge, and when the outer cover 305 is fastened, the protrusion 3051 and the groove 3031 are tightly sealed.

In order to enhance the air tightness of the cavity between the vent 3041 and the air outlet 307, the space between the turbo fan 31 and the base 303 and the space between the turbo fan 31 and the inner cover 304 are sealed by sealing glue. In order to ensure that air can only enter the turbo fan 31 through the filter assembly 32, a first elastic sealing washer 3042 in a square ring shape is disposed on one side of the inner cover 304 facing the filter assembly 32, and a second elastic sealing washer 3052 in a square ring shape is disposed on one side of the outer cover 305 facing the filter assembly 32, and when the filter assembly 32 is assembled and the outer cover 305 is fastened, the two elastic sealing washers are elastically deformed to form a seal around the edges of the upper and lower surfaces of the filter assembly 32. The elastic sealing gasket and the surface can be directly adhered, and the elastic sealing gasket can be made of foam, such as EVA foam or rubber foam.

With the above design, the following air circulation passages are formed in the housing 30 of the air cleaner 3: air enters the second chamber 302 only through the inlet 306, is filtered by the filter assembly 32, passes through the vent 3041, is pressurized by the turbo fan 31, and is exhausted through the outlet 307.

The filter assembly 32 may be any one or more of a high efficiency air filter (HEPA), an electrostatic filter, a filter cotton, a filter paper, a filter cloth, or activated carbon. The filter assembly 32 in this embodiment is a HEPA, and includes an outer frame and a filter element, the filter element is a folded filter paper, the middle of the filter element is reinforced by a rubber rib, and the filter element and the outer frame are bonded and sealed by glue. The air filtering effect is mainly determined by the sealing degree of the filter element and the outer frame, and users can select different types and different filtering grades of filters according to actual needs. The HEPA used in the filter assembly 32 of this embodiment has a filtration efficiency of over 99.95% for 0.3 micron particles.

The back and the front of the outer frame of the filter assembly 32 in this embodiment are square rings, and the first elastic sealing washer 3042 and the second elastic sealing washer 3052 are also square rings, which have similar shapes and can seal effectively after being sealed.

The turbo fan 31 is connected with a power interface 309 arranged on the base 303 through a lead, and is connected with a power supply 33 through a power connection line 34. The power supply interface 309 in this embodiment is a dc power supply interface. The power supply 33 is a cylindrical mobile power supply, and comprises a section of cylindrical lithium ion battery; the power supply 33 has charging and discharging functions and an output voltage of 5V. The rated voltage range of the turbine fan is 3V-24V, preferably 5V-12V; when the output voltage of the power supply 33 is 5V, the rated voltage of the fan is preferably 5V. The rated power of the turbo fan 31 is in the range of 0.5W to 5W, preferably 1W to 3W. The rotation speed of the turbo fan 31 is in the range of 2000 to 9000rpm, preferably 3500 to 6000 rpm. The turbine fan 31 of the present embodiment has a rated voltage of 5V, a rated power of 1.5W, and a rotational speed of about 4500 rpm.

In fig. 1, a control assembly 341 is disposed in the middle of the power connection line 34, and is provided with a switch unit and a speed regulation unit, wherein the switch unit can control the turning on and off of the turbo fan, and the speed regulation unit can control the rotation speed of the turbo fan; the control unit 341 can control the switching and speed regulation by setting the number of times and the duration of the key, for example, the long time is to start or stop the fan, and the short time is to adjust the wind speed. The control unit 341 can be disposed on the power supply 33 or the power connection line 34, and is more convenient for the wearer to operate when disposed on the power connection line 34.

The size of the air supply purification unit 4 of the present embodiment is 63mm × 63mm × 41mm, and the total weight including the turbo fan 31 and the filter assembly 32 is 89g, which is convenient for carrying. The air purifier can be used as an air purifying component of the electric air purifying respirator, and can also be independently used as a portable air purifier in bedrooms, offices, automobiles and other occasions.

The mask air inlet may be provided on either the first or second sheet material, or on the visor, preferably on the visor. The air outlet of the air purifier is connected with the air inlet of the mask, and can be directly connected or connected through an air duct. In this embodiment, the mask air inlet 26 is disposed in the middle of the visor 240, and has a shape similar to the shape of the air duct port or the air outlet of the air cleaner. In this embodiment, the blowing purification unit 4 of the air purifier 3 is disposed above the visor 240, and the visor 240 can support and fix the blowing purification unit 4.

The air duct 5 in fig. 7 is a square hollow cylinder, is separated from the casing 30, and is connected with the casing 30 by gluing, and the air outlet of the casing 30 is the air outlet of the air purifier; the air duct and the base 303 can be integrally formed by injection molding, so that the air duct becomes a part of the shell 30, and the air outlet of the original air duct becomes the air outlet of the air purifier. The internal dimension of the mask air inlet 26 is slightly larger than the external dimension of the air duct 5, and when the air duct 5 is inserted into the mask air inlet 26, the air duct and the air duct are effectively closed, so that the air tightness of the mask 2 is improved. The design enables the air duct 5 to conduct air and prevent leakage, and also plays a role in supporting and fixing the air supply purification unit 4.

The air purifier 3 and the face mask 2 adopt a separated design, so that the face mask 2 is convenient to replace, the face mask 2 can be used as a disposable product and can also be repeatedly sterilized and cleaned for use, and the first sheet 21 can be replaced; the separate design reduces the cost of use by allowing the components of the air purifier 3, except for the filter assembly 32, to be sterilized or cleaned for reuse.

Fig. 10 is a front perspective view of the powered air purifying respirator of the second embodiment. Fig. 11 is a perspective view of an air supply purification unit and an air duct of the second embodiment, and fig. 12 is an exploded view of the air supply purification unit of the second embodiment. Fig. 10 to 12 show that the mask 2 of the present embodiment is the same as the first embodiment, but the blast cleaning unit 4 is designed in a simpler structure: the turbo fan 31 is provided with a front air inlet 312 and a fan air outlet 313; the front air inlet 312 is arranged on the front 311 of the fan; the filter assembly 32 is disposed outside the front air inlet 312; the back side of the filter assembly 32 covers the front intake vent 312. The filter assembly 32 and the turbo fan 31 are sealed together by the fastening assembly 42 so that the outside air can enter the turbo fan 31 only through the filter assembly 32 when the turbo fan 31 is operated. This simple structure realizes the basic function of the air cleaner. The fastening component can be one or a combination of materials such as an elastic ring, a hoop, a bandage, an adhesive tape, a double-sided adhesive tape, a hot melt adhesive and the like, and the elastic ring is preferred. The fastening assembly 42 in this embodiment is two elastic rings 421, which pass around the left and right sides of the turbo fan 31 to bind the turbo fan 31 and the filter assembly 32 together, so that the two are tightly fitted. The design reduces structural components, reduces weight and saves manufacturing cost, and is compatible with filter assemblies with different thicknesses and even different shapes.

The filter assembly 32 in this embodiment is a HEPA, and includes an outer frame and a filter element, the filter element is a folded filter paper, the middle of the filter element is reinforced by a rubber rib, and the filter element and the outer frame are adhered and sealed by an adhesive. The HEPA used in the filter assembly 32 has a filtration efficiency of over 99.95% for 0.3 micron particles.

As shown in fig. 11 and 12, the addition of the front elastomeric seal 43 around the perimeter of the fan front 311 increases the air-tightness between the turbofan 31 and the filter assembly 32. A resilient sealing gasket may be adhered to the blower face 311. The back of the outer frame of the filter assembly 32 is square ring, the front elastic sealing washer 43 is also square ring, the shapes of the two are similar, and the two can be sealed effectively after being mutually sealed.

The air outlet 313 of the air blower of this embodiment is the air outlet of the air cleaner, and is connected with the air duct 5. The air duct 5 in fig. 11 is a square hollow cylinder, and is connected with the air outlet 313 of the fan by gluing, and the air duct and the fan can also be integrally formed by injection molding. Fig. 13 is a rear perspective view of the turbofan according to the second embodiment, and as shown, two notches 44 are provided at both left and right side edges of the rear surface 314 of the turbofan for preventing the elastic ring 421 from sliding and falling off.

With the above design, the following air flow channels are formed in the air supply purification unit 4 of the air purifier 3: the air can only pass through the filter assembly 32 from the outside, then enter the turbo fan 31 through the front air inlet 312, and is pressurized by the turbo fan 31 and then discharged through the fan air outlet 313.

The size of the air supply purification unit 4 of the present embodiment is 53mm × 53mm × 32mm, the total weight including the turbo fan 31 and the filter assembly 32 is 45g, and only half the weight of the air supply purification unit of the first embodiment, so that the air purifier 3 is more miniaturized and more portable. The turbine fan 31 of the present embodiment has a rated voltage of 5V, a rated power of 1W, and a rotational speed of about 4500 rpm.

Fig. 14 is a front perspective view of a powered air purifying respirator of the third embodiment, and fig. 15 is a perspective view of a support structure of the third embodiment. As shown in fig. 14 to 15, the mask 2 of the present embodiment adopts a simpler structure than the masks of the first and second embodiments: cap 242 does not include a crown, but only a hoop 2421 and a cap adjustment assembly 2422, which form a closed loop; the sheet fixing frame 2412 is provided at the front end edge of the visor 241. The hat hoop 2421, the brim 241 and the sheet fixing frame 2412 are made of high polymers and are formed by integral injection molding. The inner surface of the hat hoop 2421 can be added with an elastic lining to improve the wearing comfort and the air tightness. This design further reduces the cost of the mask and is more suitable for use when the air temperature is high.

Fig. 16 is a front perspective view of a powered air purifying respirator of the fourth embodiment. Fig. 17 is a front perspective view of a powered air purifying respirator of the fourth embodiment (after rotation, without power supply and wires), and fig. 18 is a front perspective view of a support structure of the fourth embodiment (after rotation). The cap body 242 of the mask 2 of the present embodiment includes a cap band 2421, a visor bracket 2425, a hinge shaft 2426, and a cap body adjusting assembly 2422; the front end of the visor bracket 2425 is connected with the rear end of the visor 241; the rear end of the hat band 2421 and the hat body adjusting component 2422; the cap body adjusting component 2422 can adjust the circumference of the cap body; the left side and the right side of the hat hoop 2421 are connected with the left side and the right side of the rear end of the hat brim support 2425 through a hinge shaft 2426; the inner side of the visor mount 2425 and the outer side of the front end of the visor 2421 are similar in curve so that they fit snugly when worn. The visor bracket 2425, the visor 241, and the sheet fixing bracket 2412 may be integrally injection molded. This design is convenient to wear, and the front end of the mask 2 can be rotated back around the headgear 2421 before wearing, as shown in fig. 17; after the headgear 2421 is worn, the front end of the mask 2 is rotated forward around the headgear 2421 to close the inner side of the visor mount 2425 and the outer side of the front end of the headgear 2421. The lower end edge of the first sheet 21 and the lower end edge of the second sheet 22 of the mask 2 of this embodiment are joined together by gluing and are reinforced by adding a plurality of rivets 215. The lower end edge of the first sheet 21 and the lower end edge of the second sheet 22 may also be connected by means of snap fasteners, replacing the rivet 215 with a snap fastener, which facilitates the removal and replacement of the two.

HEPA with a filtration rate of over 99.95 percent is used as the filter component of the electric air purifying respirators of the four embodiments, and the leakage rate of the filter component worn by a real person is tested, wherein the leakage rate is lower than 1 percent, and the leakage rate of most embodiments is lower than 0.2 percent. The test method comprises the following steps: after the test experimenter wore the electronic air purification respirator, the concentration of 0.3 micron particle of the air after the purification in the face guard cavity and the concentration of 0.3 micron particle in the outside air, and the ratio between the two is regarded as the leakage rate. The results are given in the following table:

examples	1	2	3	4
					Leak rate	0.07％	0.72％	0.10％	0.14％

For epidemic prevention and dust prevention, the electric air purification respirator has the advantages of good protection effect, low cost and convenient and comfortable wearing.

As can be seen from the above examples, the present invention provides several masks and several air purifiers, which are used in conjunction. The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the technical scope of the present invention.

Claims (10)

1. A face mask for a powered air purifying respirator, characterized by: the mask comprises a first sheet of material, a second sheet of material, an adjustment structure, and a support structure; the supporting structure comprises a brim and a cap body; the first sheet material is flexible, transparent, and impermeable; the second sheet is flexible, pliable; the lower end edge of the first sheet and the lower end edge of the second sheet are superposed and joined together; the upper end edge of the first sheet is connected with the front end of the brim; the second sheet is arranged on one surface of the first sheet facing the head of a wearer; the support structure holding the mask fixed to the wearer's head; the adjustment structure and the upper end edge of the second sheet are connected together; the left end and the right end of the adjusting structure are connected with the left side edge and the right side edge of the first sheet material; the length of the adjustment structure is adjustable to maintain the adjustment structure against the head of the wearer when worn; the adjustment structure is resilient.

2. The mask according to claim 1, wherein the adjustment structure comprises an adjustment cord and a sleeve; the adjusting rope is wrapped by the sleeve; the left side edge and the right side edge of the first sheet are respectively provided with a limiting hole; two ends of the adjusting rope respectively penetrate through the two limiting holes; the limiting holes limit sliding of the adjusting ropes, so that the length of the adjusting structure can be adjusted by changing the length of the adjusting ropes between the two limiting holes.

3. A mask as claimed in claim 1, wherein the front end of the visor is provided with a sheet holder; at least two fixing buckles are arranged on the outer side face of the sheet fixing frame; the upper end edge of the first sheet is provided with at least two fixing holes; the first sheet is connected to the front end of the visor through the fastening holes and the fastening buckles on the sheet fastening frame.

4. The mask according to any one of claims 1-3, wherein the cap includes a band and a cap adjustment assembly; the front end of the hat hoop is connected with the rear end of the hat brim; the rear end of the cap hoop is connected with the cap body adjusting component; the cap body adjusting assembly can adjust the circumference of the cap body.

5. The mask of claim 4 wherein the cap comprises a band, a cap adjustment assembly, and a crown; the inner surface of the lower end of the crown is connected to the outer surface of the band.

6. A mask as in any one of claims 1-3, wherein the cap includes a cap band, a visor bracket, a hinge axis, and a cap adjustment assembly; the front end of the brim support is connected with the rear end of the brim; the rear end of the cap hoop is connected with the cap body adjusting component; the cap body adjusting component can adjust the circumference of the cap body; the left side and the right side of the hat hoop are connected with the left side and the right side of the rear end of the hat brim support through the hinge shaft; the curves of the inner side surface of the brim support and the outer side surface of the front end of the hat hoop are similar, so that the brim support and the hat hoop are close to each other when the hat is worn.

7. A powered air purifying respirator, characterized by comprising an air purifier and a face mask according to any one of claims 1-6; the mask is provided with a mask air inlet; the air purifier is provided with an air outlet; and the air outlet of the air purifier is connected with the air inlet of the mask.

8. The powered air purifying respirator of claim 7, wherein the air purifier comprises a supply air purifying unit and a power source; the air supply purification unit comprises a turbine fan and a filtering component; said turbo fan and said filter assembly being contained within a housing; the shell is provided with an air inlet and an air outlet; the shell comprises a base, an inner cover and an outer cover; a first cavity is arranged between the base and the inner cover; the first cavity accommodates the turbine fan and is provided with a ventilation opening and an air outlet; the ventilation opening is formed in the inner cover; a second cavity is arranged between the inner cover and the outer cover; the second cavity is used for accommodating the filtering component and is communicated with the outer side of the shell through the air inlet.

9. The powered air purifying respirator of claim 7, wherein the air purifier comprises a supply air purifying unit and a power source; the air supply purification unit comprises a turbine fan and at least one filtering component; the turbine fan is provided with a fan air outlet and at least one fan air inlet; the filter assembly is arranged on the outer side of the air inlet of the fan; the back surface of the filter assembly covers the air outlet of the fan; one side of the fan air inlet of the turbofan and the back of the filter assembly are tightly combined together through a fastening assembly, so that when the turbofan runs, outside air can only pass through the filter assembly and then enter the turbofan through the fan air inlet; the fastening component is one or a combination of a plurality of elastic rings, hoops, bands, adhesive tapes and double-sided adhesive tapes.

10. The powered air purifying respirator of claim 8 or 9, wherein the mask air inlet opens onto the visor; the air supply purification unit is arranged above the brim; the power supply is separated from the air supply purification unit, and the power supply is connected with the air supply purification unit through a conducting wire.

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