CN114849098A - Portable mask and electric air purification respirator comprising same - Google Patents

Abstract

The present invention specifically relates to a low cost lightweight face mask and powered air purifying respirator including the same that includes a uniquely configured face mask and air purifier. The mask includes a transparent flexible first sheet, a second sheet, an adjustment structure, and a support structure. 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

Portable mask and electric air purification respirator comprising same

Technical Field

The present invention relates in particular to a low cost lightweight face mask for a powered air purifying respirator and a powered air purifying respirator incorporating the same.

Background

People usually wear a mask to prevent common influenza virus and new coronavirus. The mask has a certain leakage rate, for example, the leakage rate of a flat medical surgical mask is up to more than 30% when the mask is worn normally; even the KN95 mask has a leakage rate of about 10%. Moreover, when the mask is worn, the breathing is affected, especially for children and people with poor breathing. In order to prevent the transmission of virus droplets, people wear transparent protective masks, but the protective effect on airborne viruses or germs cannot be achieved.

In high-risk areas, Powered Air Purifying Respirators (PAPRs) are commonly employed by humans. 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.). PAPR pressurizes air after it has been filtered, and then delivers it to a respirator hood, and maintains a positive pressure inside the respirator hood relative to the outside, thereby preventing outside contaminated air from entering the respirator hood, with a very low leak rate (typically less than 0.5%).

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, much smaller in air volume than a professional type PAPR, high in leakage rate (generally over 1%) due to the fact that the purifier needs to be used with a special mask, far inferior to the professional type PAPR in positive pressure protection effect, and 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 lightweight facepiece for a PAPR and a powered air purifying respirator incorporating the same.

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, wearing comfort, convenient carrying 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 support structure comprises an elastic cushion and a mask fixing component; 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 of the first sheet and the support structure are connected together; the support structure holding the mask fixed to the wearer's head and holding the cushion against 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 relative distance of the left and right side edges of the first sheet can be adjusted by the adjustment structure and/or the support structure to maintain the left and right side edges of the first sheet against the wearer's head 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 and the relative distance between the left side edge and the right side edge of the first sheet material 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 regulating structure and the elastic pad form an enclosed area around the wearer's face when worn.

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

In one embodiment of the present invention, the mask fixing assembly includes at least one elastic band, and both ends of the elastic band are connected to left and right sides of an upper end of the first sheet, respectively.

In one embodiment of the invention, the elastic pad is one or a combination of sponge and foam.

In one embodiment of the present invention, the elastic pad is a composite of sponge and foam, the end connected to the first sheet is sponge, and the end near the head is foam.

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 1mm, preferably between 0.2 and 0.5 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 elastic cushion.

In one embodiment of the invention, the mask air inlet is supported by an air inlet sleeve.

In one embodiment of the invention, the air inlet sleeve is a rigid material.

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

The mask can be used as a mask of not only a power air purifying respirator, but also other types of masks, such as an oxygen inhalation mask and a steel cylinder type positive pressure 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 present invention, an economical and lightweight powered air purifying respirator is provided, which includes an air purifier and a face mask 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 accommodates the filter assembly 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 one elastic ring, and the elastic ring is 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 one notch is disposed on each of the left and right edges of the back and/or front of the turbofan, so as to limit the 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 elastic pad.

In one embodiment of the present invention, an L-shaped bracket is provided at an upper end of the first sheet to support and fix the air supply purification unit.

In one embodiment of the invention, the mask attachment assembly includes a first elastic strap and a second elastic strap; two ends of the first elastic band are respectively connected with two sides of the upper end of the first sheet; one end of the second elastic band is connected with the air supply purification unit, and the other end of the second elastic band is connected with the middle part of the first elastic band.

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 the elastic cushion and the elastic band, so that the cost and the weight are greatly reduced.

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

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

5) 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.

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

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

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

9) 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.

10) The leakage rate of the electric air purifying respirator is lower than 1%, the leakage rate of some embodiments is lower than 0.3%, 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 of the present invention;

FIG. 2 is an inside view of a first embodiment of the present invention with the mask laid flat (without the mask attachment assembly);

FIG. 3 is a perspective view of the mask flexure (without the mask attachment assembly) of the first embodiment of the present invention;

FIG. 4 is a perspective view of the supply air purification unit and air duct of the first embodiment of the present invention;

FIG. 5 is a side view of the outlet side of the blower cleaning unit according to the first embodiment of the present invention;

FIG. 6 is an exploded view of the supply air purification unit and air duct of the first embodiment of the present invention;

FIG. 7 is a side sectional view of a supply air cleaning unit according to a first embodiment of the present invention;

FIG. 8 is a front perspective view of a powered air purifying respirator of a second embodiment of the present invention;

FIG. 9 is a front perspective view of a powered air purifying respirator of a third embodiment of the present invention;

FIG. 10 is a perspective view of a supply air purification unit and air duct of a third embodiment of the present invention;

FIG. 11 is an exploded view of a blower purification unit according to a third embodiment of the present invention;

FIG. 12 is a rear perspective view of a turbofan according to a third embodiment of the invention;

FIG. 13 is a front perspective view of a powered air purifying respirator of the fourth embodiment of the present invention;

FIG. 14 is a perspective view of a blower purifying unit and an air duct according to a fourth embodiment of the present invention

FIG. 15 is a rear perspective view of a turbofan according to a fourth embodiment of the invention;

fig. 16 is a rear perspective view of a turbofan according to a fifth embodiment of the invention;

FIG. 17 is a front perspective view of a powered air purifying respirator of a sixth embodiment of the present invention;

FIG. 18 is an inside view of a face shield (without a face shield attachment assembly) according to a sixth embodiment of the present invention;

FIG. 19 is a front perspective view of a powered air purifying respirator of the seventh embodiment of the present invention.

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. Mounting hole 212, limiting hole 213 and reinforcing structure

2131. Male buckle 2132, female buckle 214 and edge wrapping belt

2141. Hemming stitch 2142, hemming band edge 22, second sheet

23. Adjusting structure 231, sleeve 232 and adjusting rope

233. Pleat 24, support structure 240, resilient pad

2401. Sponge cushion 2402, foam cushion 241 and mask fixing assembly

2411. A first elastic band 2412, a second elastic band 2413 and a Chinese character ri' shaped button

2414. Elastic collar 25, mask cavity 251, flat cavity

26. Mask air inlet 261, air inlet sleeve 27 and L-shaped support

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

41. Bellows 42, fastening assembly 421, 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", "left side", "right side", "inner side", "outer side", "front side", "back side", 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, 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 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 "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 will be further explained 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 mask and a lightweight economical powered air purifying respirator equipped therewith. Fig. 1 to 7 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 3.

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 an elastic cushion 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 it is desired to increase the airtightness of the mask, a composite material comprising an air-impermeable polymer film may be selected.

Figure 2 is an inside view of the mask lay-flat (without the mask attachment assembly) 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. 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 pair of snap fasteners: the male buckle 2131 and the female buckle 2132 can be fastened, the face mask 2 can be folded left and right and then buckled, the area is smaller, and the carrying is convenient. 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 two ends of the adjusting rope 232 are limited by the limiting holes 212 to slide, so that the length of the adjusting rope 232 in the middle of 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, the adjusting rope 232 generates a contraction force, the first sheet 21 shown in fig. 3 is bent, and the linear distance between the two limiting holes 212 is also reduced. The sleeve 231 is laid flat with a length larger than the straight distance between the two stopper holes 212 after the first sheet 21 is bent, and thus the sleeve 231 becomes smaller in length by forming the wrinkles 233. When worn, with the adjustment structure 23 abutting beneath the wearer's head, typically beneath the chin, the adjustment structure 23 being stretch-deformed to generate a contractive force to maintain the adjustment structure 23 abutting beneath the wearer's head, while also maintaining the left and right edges of the first sheet 21 against the left and right sides of the wearer's head with the mask attachment assembly 241. The length of the adjusting string 232 between the left and right edges of the first sheet 21, i.e. between the two limiting holes 212, is changed to adjust the close fit between the adjusting structure 23 and the left and right edges of the first sheet 21 and the head of the wearer.

As shown in fig. 1, 2 and 3, the upper end of the first sheet 21 and the elastic pad 240 are connected together, and this embodiment is connected by gluing. The second sheet 22 and the elastic pad 240 are both located on the side of the first sheet 21 facing the head of the wearer, i.e. the inner side of the first sheet 21. In this embodiment, the elastic pad 240 is a composite of sponge and foam; one end connected with the first sheet 21 is made of thick sponge 2401, and the other end is made of thin EVA foam pad 2402; the thin EVA foam can improve the skin-adhering feeling when being worn and reduce the discomfort of partial wearers when the forehead contacts the sponge. To enhance the airtightness of the mask 2, the portion of the elastic pad 240 near the mounting hole 211 is gradually thinned.

The first sheet 21, the second sheet 22, the adjustment structure 23 and the elastic pad 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 and deformed to form a flat cavity 251. When worn, the inner side of the elastic pad 240, the left and right side edges of the first sheet 21, and the adjustment structure 23 abut against the head of the wearer. 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; an air-permeable component can also be arranged on the mask, for example, the elastic cushion 240 is made of an air-permeable sponge, or an air outlet of the mask is arranged, or a one-way breather valve is arranged on the first sheet or the second sheet, and the air in the mask cavity 25 can be discharged to the outside through the one-way breather valve, but the outside air can not 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, 4 to 7. 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. 6 is an exploded view of the air supply purification unit 4 and the air duct 5 of the present embodiment, and fig. 7 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 houses the filter assembly 32 and communicates with the outside of the housing 30 through the intake vent 306. As shown in fig. 4, 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 part of the electric air purifying respirator, and can also be used alone as a portable air purifier in places such as bedrooms, offices, automobiles and the like.

The mask air inlet can be arranged on the first sheet material or the second sheet material, and can also be arranged on the elastic cushion, and preferably is arranged on the elastic cushion. 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 air inlet 26 of the mask is disposed in the middle of the elastic pad 240, and has a shape similar to the shape of the air outlet of the air duct or the air outlet of the air cleaner, and the periphery of the elastic pad is supported and reinforced by a rigid material, such as the air inlet sleeve 261 in fig. 3, which is made of plastic. In this embodiment, the blowing and purifying unit 4 of the air purifier 3 is disposed above the elastic pad 240; an L-shaped bracket 27 is further provided at the upper end of the first sheet 21 for supporting and fixing the blast cleaning unit 4.

The air duct 5 in fig. 4 is a square hollow cylinder, is separated from the shell 30, and is connected with the shell 30 by gluing, and the air outlet of the shell 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 dimensions of the inlet sleeve 261 on the mask are slightly larger than the external dimensions of the airway tube 5, and when the airway tube 5 is inserted into the inlet sleeve 261, both are effectively sealed, improving the air tightness of the mask 2. 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 mask fixing assembly 241 in fig. 1 includes two elastic bands, wherein two ends of a first elastic band 2411 respectively pass through the mounting hole 211 of the first sheet 21 to be connected with the first sheet 21, one end of a second elastic band 2412 is connected to the middle of the first elastic band 2411, the other end is connected to the blowing purification unit 4, and the second elastic band 2412 can share part of the weight of the blowing purification unit 4. The two elastic bands are provided with a Chinese character 'ri' shaped button 2413 for adjusting the length of the elastic bands. The mask attachment assembly 241 holds the mask 2 on the wearer's head and holds the elastic pad 240 against the wearer's head; while holding the left and right side edges of the first sheet 21 close to or against the left and right sides of the wearer's head together with the adjustment structure 23. The first elastic band 2411 is further provided with an elastic ring 2414 for fixing and supporting the power source 33. The elastic band can be replaced by a rubber ring or a plastic ring, and if an inelastic plastic ring is adopted, a lock catch structure can be added on the plastic ring to adjust the circumference; but elastic bands are preferred, which are low cost and simple and comfortable to wear.

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 components in the air purifier 3 except the filtering component 32 can be sterilized or cleaned for repeated use, so that the use cost is reduced by the separated design.

Fig. 8 is a front perspective view of the powered air purifying respirator of the second embodiment. The mask fixing component 241 of this embodiment includes an elastic band, and the air supply purification unit 4 is disposed in the middle of the elastic band and is located behind the wearer's brain when worn; the air duct is a corrugated pipe 41, and the air supply purification unit 4 is connected with the mask air inlet 26 through the corrugated pipe 41. The design of the air supply purification unit 4 arranged at the back of the head can reduce the pollution of the spray of the opposite side to the filter assembly 32 when the wearer faces other people, and can also reduce the weight born by the front of the head when the wearer wears the air supply purification unit, thereby improving the comfort. The lower end edges of the first sheet 21 and the second sheet 22 of the mask 2 are adhesively connected, again to form a flat cavity. The reinforcing structure 213 of this embodiment comprises rivets and the elastic pad 240 of the mask 2 is a sponge.

Fig. 9 is a front perspective view of a powered air purifying respirator of the third embodiment. Fig. 10 is a perspective view of an air supply purification unit and an air duct of a third embodiment, and fig. 11 is an exploded view of the air supply purification unit of the third embodiment. Fig. 9 to 11 show that the blower cleaning unit 4 in the present embodiment is designed to have 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 a plurality 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 glue. 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. 10 and 11, 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. 10 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. 12 is a rear perspective view of the turbofan according to the third 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.

The mask attachment assembly 241 of this embodiment includes an elastic band, wherein the ends of the elastic band are connected to the first sheet 21 through the mounting holes 211 of the first sheet 21. The elastic band is provided with a Chinese character 'ri' button 2413 for adjusting the length of the elastic band. The elastic band is further provided with an elastic ring 2414 for fixing the power supply 33 of the air cleaner 3. The power connection line 34 is directly led out from the turbo fan 31, and the control assembly 341 is arranged in the middle and is connected with the power supply 33 through the USB connector.

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, 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. 13 is a front perspective view of a powered air purifying respirator of a fourth embodiment, fig. 14 is a perspective view of a supply air purifying unit and air duct of the fourth embodiment, and fig. 15 is a rear perspective view of a turbo fan of the fourth embodiment. As shown in fig. 13 to 15, compared to the third embodiment, the turbo fan 31 of the present embodiment has two air inlets: a front intake vent 312 and a back intake vent 315. The two filter assemblies 32 are respectively arranged on the front 311 and the back 314 of the turbofan 31, and are respectively arranged between the filter assemblies and the turbofan by the front elastic sealing gasket 43 and the back elastic sealing gasket 45, so as to enhance sealing. The elastic sealing gaskets can be adhered to the front and the back of the fan. The two filter assemblies 32 and the turbo fan 31 are bound together by two elastic bands 43. Compared with the third embodiment, the present embodiment adds one filter assembly 32, the wind resistance will be reduced, and the wind volume will be increased. In this embodiment, the power connection line 34 is directly led out from the turbo fan 31 and connected to the power supply 33 through a USB connector.

The fifth embodiment is the same as the fourth embodiment except for the back of the turbo fan. Fig. 16 is a rear perspective view of the turbofan of the fifth embodiment. As shown in fig. 16, the rear cover 51 is provided on the rear surface 314 of the turbo fan 31 of the present embodiment, and a circular rear ventilation opening 52 is provided in the middle; when weight reduction is desired, only one filter assembly may be used. By placing a baffle 53 having a shape and thickness corresponding to the back vent 52 in the back vent 52 and sealing it with tape, the back inlet 315 is sealed from the inlet air, and the turbo fan 31 is converted to a single inlet fan of the type described in the third embodiment. Thus, this embodiment may include two filter elements as in the fourth embodiment, or may include only one filter element as in the third embodiment.

Fig. 17 is a front perspective view of a powered air purifying respirator of the sixth embodiment. In this embodiment, the filter assembly 32 and the turbo fan 31 are fastened together by gluing, and the gluing material is a double-sided adhesive tape that is easily peeled off, which can enhance the air tightness.

Fig. 18 is an inside view of a sixth embodiment of a face shield (without a face shield attachment assembly). As shown in fig. 17 and 18, the adjusting structure 23 of the mask 2 of this embodiment comprises an elastic strip 61, and the fabric wrapped around the elastic strip 61 is sewn and stretched, and is connected to the upper end edge of the second sheet 22 by a connecting seam 62, and the fabric wrapped around the elastic strip 61 can be made of a material different from that of the second sheet 22, so that the adjusting structure 23 can be made of a material with a softer and more skin-friendly property. The two ends of the adjusting structure 23 are connected to two connection points 63 provided on the first sheet 21, and the connection points 63 may be rivets, snaps, etc. When the first sheet 21 is not worn, the length of the adjusting structure 23 is smaller than the distance between the two connecting points 63 when the first sheet 21 is laid flat, and under the contraction force of the adjusting structure 23, the first sheet 21 is bent, and the linear distance between the two connecting points 63 is smaller, and is generally smaller than the linear distance of the corresponding positions of the head of the wearer. When worn, the adjustment structure 23 needs to be stretched and the elastic strip 61 generates a contraction force to secure the adjustment structure 23 against the head of the wearer.

Fig. 19 is a front perspective view of a powered air purifying respirator of the seventh embodiment. The blast cleaning unit 4 of the present embodiment has dimensions of 56mm × 56mm × 38mm, and the total weight including the turbo fan 31 and the filter assembly 32 is 70g, which is smaller in size and lighter in weight than the first embodiment. The turbo fan 31 of the present embodiment has a rated voltage of 5V, a rated power of 1.2W, and a rotation speed of about 5000 rpm.

The mask attachment assembly 241 of this embodiment may also function as a mask attachment member using an elastic band. This embodiment also employs the same mask as the sixth embodiment, wherein the adjustment structure 23 comprises an elastic strip 61, and the upper end edge of the second sheet 22 and the stretched elastic strip 61 are sewn together to form the adjustment structure 23 which functions as the sixth embodiment, and the contraction force generated by the elastic strip 61 ensures that the adjustment structure 23 abuts against the head of the wearer.

HEPA with a filtration rate of over 99.95% was used as the filter assembly of the powered air purifying respirator of the seven embodiments, and the leakage rate of the powered air purifying respirator worn by a real person was tested, wherein the leakage rate was less than 1%, and the leakage rate of the powered air purifying respirator of the three embodiments was less than 0.3%. 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	5	6	7
								Leak rate	0.08％	0.09％	0.82％	0.94％	0.86％	0.48％	0.25％

The fans of the first embodiment and the second embodiment have the largest air quantity and the lowest leakage rate; the seventh embodiment has a small air volume and a slightly higher leakage rate than the first and second embodiments; the third embodiment to the sixth embodiment all adopt simple design, the leakage rate is higher than that of the above embodiments, firstly, no shell is used, the leakage is easy, and secondly, the air volume is small; but lighter in weight and less costly. These powered air purifying respirators can meet different needs of different populations.

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 mask provided by the present invention can be used in connection with several different air purifiers. 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 support structure comprises an elastic cushion and a mask fixing component; 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 of the first sheet material is connected with the elastic cushion; the support structure holding the mask fixed to the wearer's head and holding the cushion against 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 relative distance of the left and right side edges of the first sheet can be adjusted by the adjustment structure and/or the support structure to maintain the left and right side edges of the first sheet against the wearer's head when worn.

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 and the relative distance between the left side edge and the right side edge of the first sheet material can be adjusted by changing the length of the adjusting ropes between the two limiting holes.

3. A mask as claimed in claim 1 or claim 2, wherein the adjustment structure is resilient.

4. A mask according to claim 1 or 2, wherein the mask attachment assembly includes at least one elastic band having both ends connected to left and right sides of an upper end of the first sheet, respectively.

5. A powered air purifying respirator, comprising an air purifier and a face mask according to any one of claims 1-4; 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.

6. The powered air purifying respirator of claim 5, 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.

7. The powered air purifying respirator of claim 5, 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 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 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.

8. The powered air purifying respirator of claim 6 or 7, wherein the power source and the supply air purifying unit are separate, and wherein the power source and the supply air purifying unit are connected by wires.

9. The powered air purifying respirator of claim 6 or 7, wherein the mask air inlet opens onto the resilient pad; the air supply purification unit is arranged above the elastic cushion.

10. The powered air purifying respirator of claim 9, wherein the mask attachment assembly comprises a first elastic band and a second elastic band, wherein two ends of the first elastic band are connected to two sides of the upper end of the first sheet, respectively, one end of the second elastic band is connected to the supply air purifying unit, and the other end of the second elastic band is connected to the middle of the first elastic band.

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