CN211885011U

CN211885011U - Blowback filter mask

Info

Publication number: CN211885011U
Application number: CN202020268385.0U
Authority: CN
Inventors: 郭铁岩; 张会珍
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-03-06
Filing date: 2020-03-06
Publication date: 2020-11-10
Anticipated expiration: 2030-03-06

Abstract

The utility model relates to a blowback filter mask. This blowback filter mask includes at least: gauze mask main part, fan, filter piece, discharge valve, controller are equipped with two business turn over gas pockets and an exhaust hole in the gauze mask main part at least, the fan set up in the business turn over gas pocket, filter the piece set up in the fan outside, discharge valve set up in the exhaust hole, the controller with fan electric connection. The utility model discloses possess following advantage and at least one among the positive effect: air is injected into the mask main body through the forward rotation of the fan, so that the air suction resistance of a wearer is reduced, and the air suction quality and safety of the wearer are guaranteed; the dust, tiny particles, bacteria and viruses intercepted outside the filtering piece are blown off through the reverse rotation of the fan, so that the filtering effect and the service life of the filtering piece are improved. In addition, when one fan of the two fans stops running, the other fan enters a constant speed mode to run, the purpose of backwashing can be achieved, and particularly, the exhaust hole is better sealed by a screw cap.

Description

Blowback filter mask

Technical Field

The utility model relates to a sanitary and healthy protective equipment technical field, concretely relates to blowback filter mask.

Background

As is well known, when the mask is used, filter substances intercepted on the outer side of a filter layer of the mask are attached or accumulated along with the extension of wearing time, so that the effective filtering area is reduced, the filtering resistance is increased, the breathing of a wearer is not smooth, and the phenomenon of oxygen deficiency can be caused when the wearer wears the mask for a long time.

Chinese patent CN201711266431.2 discloses an electric mask backwashing all-in-one machine, which only has one air inlet and one filtering membrane, and can not be backwashed during wearing, and can only be backwashed when not wearing; meanwhile, the back washing can not be automatically controlled, the back washing can only be manually controlled, and the air for the back washing is not pure air filtered by the filtering membrane.

To overcome the defects in the prior art, the application provides a back-blowing filter mask.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main aim at overcomes at least one kind of defect among the prior art, provides a blowback filter mask. The utility model discloses a fan corotation, the cooperation of reversal realize washing away the foreign matter on the filter piece for wearing personnel's air feed, guarantee to filter the purpose that can long-time high-efficient use.

In order to realize the technical scheme, the utility model discloses a following technical scheme:

according to an aspect of the utility model, a blowback filter mask is provided, include at least:

the mask comprises a mask body, wherein the mask body is at least provided with two air inlet and outlet holes and an exhaust hole; the air inlet and outlet holes are not only used as air inlet channels, but also can be used as air outlet channels, and the air outlet holes can only be used as air outlet channels and cannot be used for air inlet channels;

the fans are arranged in the air inlet and outlet holes, and the number of the fans is equal to that of the air inlet and outlet holes;

the filtering piece is arranged outside the fan and used for intercepting foreign matters in the air entering the inlet cover body;

the exhaust valve is arranged in the exhaust hole and can prevent external air from entering the port cover body from the exhaust hole;

and the controller is electrically connected with the fan and is used for controlling the forward rotation and the reverse rotation of the corresponding fan.

In the utility model, a fan is arranged at each air inlet and outlet hole, and a filter element is arranged outside the fan to form an independent filter system; the two air inlet and outlet holes, the two fans and the two filtering pieces respectively form two independent filtering systems which are distributed on two sides of the mouth and nose of the human body; each independent filtering system can work independently or two filtering systems can work simultaneously.

According to the utility model discloses an embodiment, still include the protection casing, set up in filter the piece outside.

According to an embodiment of the present invention, the exhaust valve is a one-way valve; the exhaust valve comprises a valve body and a valve fixing piece, and the valve body is matched with the exhaust hole through the valve fixing piece; correspondingly, the valve fixing piece is provided with a vent hole which is used as a channel for exhausting gas in the mask main body. The one-way valve only allows air in the mask main body to be discharged through the exhaust valve, and does not allow external air to enter the mask main body through the exhaust valve.

According to an embodiment of the present invention, the valve body is preferably a rubber sealing piece.

According to an embodiment of the present invention, the filter member includes one or more of a melt-blown fabric layer, a composite fiber layer, a HEPA particle filter, and an activated carbon filter.

According to an embodiment of the present invention, the fan is powered by a battery.

According to the utility model discloses an embodiment, the shape of gauze mask main part suits with human mouth nose, be equipped with the sealing washer around the gauze mask main part, prevent that the outside air from getting into around the gauze mask main part.

According to the utility model discloses an embodiment, the both sides of gauze mask main part all are connected with the ear area, the ear area passes through the fixed orifices and is connected with the gauze mask main part.

According to the utility model discloses an embodiment, the business turn over gas pocket includes first business turn over gas pocket, second business turn over gas pocket, is located human oronasal part both sides respectively. Each air inlet and outlet hole is sequentially provided with a fan, a filter piece and a protective cover from inside to outside.

According to the utility model discloses an embodiment, be equipped with the air vent on the protection casing, protection casing and business turn over gas pocket fixed connection prevent that fan, filtration piece from breaking away from business turn over gas pocket department.

According to an embodiment of the present invention, the exhaust hole is located below the mouth and nose of the human body.

According to an embodiment of the utility model, battery, controller are fixed in wearing personnel's shoulder, arm, waist or jacket pocket, convenient to carry.

According to an embodiment of the present invention, the fan can be operated in both forward and reverse directions, and can be operated at high and low speeds, i.e. the rotation direction and the rotation speed of the fan can be adjusted;

when the fan rotates forwards, air is injected into the mask main body, and foreign matters in the air are intercepted outside the filter piece;

when the fan rotates forwards at a high speed, the air suction amount of a wearer can be ensured, and the air suction resistance is reduced;

when the fan rotates forwards at a low speed, the pressure of a wearer during expiration can be reduced, and the expiration resistance is reduced;

when the fan rotates reversely, air in the mask main body is discharged through the air inlet and outlet holes, and foreign matters intercepted outside the filtering piece are blown off.

According to the utility model discloses an embodiment, the fan includes first fan, second fan, and wherein first fan is installed in first air inlet and outlet hole, and the second fan is installed in second air inlet and outlet hole. The motors of the first fan and the second fan are direct-current brushless variable frequency motors, and the sound is reduced to 26 decibels when the motors work.

According to an embodiment of the present invention, when the first fan positively rotates to inject air into the mask body, the foreign matters in the air are intercepted outside the first fan external filter element, and the pure air is inhaled by the wearer;

when the second fan positively rotates to inject air into the mask main body, foreign matters in the air are intercepted at the outer side of the second fan external filtering piece, and pure air is sucked by a wearer;

or when the first fan and the second fan are simultaneously and positively rotated to inject air into the mask main body, foreign matters in the air are intercepted at the outer sides of the outer filtering pieces of the first fan and the second fan, and the pure air is sucked by a wearer;

the remaining air and/or exhaled air is expelled from the exhaust vent when the wearer inhales.

According to an embodiment of the present invention, when the first fan rotates forward and the second fan rotates backward, the air injected by the first fan and the air exhaled by the wearer are sucked away by the second fan and exhausted through the second air inlet/outlet hole, and the foreign matter intercepted outside the external filter of the second fan is blown off;

or when the second fan rotates forwards and the first fan rotates backwards, the air injected by the second fan and the air exhaled by the wearer can be sucked away by the first fan and exhausted through the first air inlet and outlet hole, and meanwhile, foreign matters intercepted by the outer side of the first fan external filtering piece are blown off.

According to an embodiment of the present invention, the controller is preferably a single chip microcomputer or a programmable controller. Furthermore, the controller is provided with a control button or a touch screen for selecting on/off, setting mode and setting mode parameters.

According to another aspect of the utility model, a use method of a backwash filter mask is provided, the controller is provided with three operation modes:

one mode is a constant speed mode, namely, the fan continuously and positively turns to supply air in the mask main body at a constant speed, and the air in the mask main body is exhausted through the exhaust hole;

the other mode is a pulse mode, namely the running speed of the fan changes from high to low and then from low to high in a circulating pulse type manner to positively turn to the mask main body for supplying air, and the air in the mask main body is exhausted through an exhaust hole;

the third mode is a back-flushing mode, namely the first fan rotates forwards and the second fan rotates backwards simultaneously, or the first fan rotates backwards and the second fan rotates forwards simultaneously; after the interval reaches the set time, the original forward rotation fan is converted into reverse rotation, meanwhile, the original reverse rotation fan is converted into forward rotation, and the air in the mask main body is discharged through the air inlet and outlet hole at the position of the reverse rotation fan.

According to an embodiment of the present invention, the controller can monitor the operation status of the fans, and when one of the fans stops operating, the controller will control the other fan to enter the constant speed mode; the gas in the mask main body is discharged through the air inlet and outlet hole and the exhaust hole at the position of the stop operation fan, so that foreign matters intercepted outside the filtering piece can be blown off.

According to the utility model discloses an embodiment, when exhaust vent department sealed through the nut, gaseous business turn over gas pocket, the filtration piece of stopping operation fan department of looping through in the gauze mask main part is discharged, has realized blowing off the foreign matter of filtering a outside interception to the back flush of filtration piece.

According to the utility model discloses an embodiment, when pulse mode state operation, when carrying out high-speed to low-speed forward operation by two fans of controller control, pulse frequency is the same with the respiratory frequency who wears personnel, and the realization is breathed in the time high-speed corotation air supply volume big pressure of fan and is high, and the fan low-speed corotation air supply volume little pressure is low during expiration, improves the respiratory effect and the sensation of wearing personnel.

According to the above technical scheme, the utility model discloses possess at least one in following advantage and the positive effect:

air is injected into the mask main body through the forward rotation of the fan, so that the air suction resistance of a wearer is reduced, and the air suction quality and safety of the wearer are guaranteed; the dust, tiny particles, bacteria and viruses intercepted outside the filtering piece are blown off through the reverse rotation of the fan, so that the filtering effect and the service life of the filtering piece are improved.

In addition, when one fan of the two fans stops running, the other fan enters a constant speed mode to run, the purpose of backwashing can be achieved, and particularly, the exhaust hole is better sealed by a screw cap.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural view of an embodiment of a back-blowing filter mask according to the present invention;

FIG. 2 is a schematic structural view of the first gas inlet/outlet hole in FIG. 1;

FIG. 3 is a schematic structural view of the second gas inlet/outlet hole in FIG. 1;

FIG. 4 is a schematic view of the vent of FIG. 1;

fig. 5 is a schematic structural view of the exhaust hole in fig. 4 during exhausting.

The reference numerals are explained below:

1-mask main body, 11-first air inlet and outlet hole, 12-second air inlet and outlet hole, 13-exhaust hole, 14-sealing ring, 15-fixing hole, 2-first fan, 3-second fan, 4-filtering piece, 5-exhaust valve, 51-valve body, 52-valve fixing piece, 6-protective cover and 7-vent hole.

Detailed Description

In the description of the present invention, "a plurality" means two or more unless otherwise specified. The terms "inner," "upper," "lower," and the like, refer to an orientation or a state relationship based on that shown in the drawings, which is for convenience of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. To those of ordinary skill in the art, the specific meaning of the above terms in the present invention is understood according to the specific situation.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances for purposes of describing the embodiments of the invention herein.

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in the attached drawings 1-5, the utility model relates to a blowback filter mask, which comprises a mask main body 1, a first fan 2, a second fan 3, a filter piece 4, an exhaust valve 5, a protective cover 6, a controller and a battery.

In this embodiment, the mask body 1 is provided with a first air inlet/outlet hole 11, a second air inlet/outlet hole 12 and an exhaust hole 13; the first and second air inlet and outlet holes 11 and 12 can be used not only as air inlet channels but also as air outlet channels, and the air outlet hole 13 can only be used as an air outlet channel and cannot be used for an air inlet channel. The first fan 2 is disposed in the first air inlet/outlet hole 11, and the second fan 3 is disposed in the second air inlet/outlet hole 12. The filter members 4 are provided in two groups, which are respectively disposed outside the first fan 2 and the second fan 3, and the filter members 4 are used for intercepting foreign matters in the air entering the inlet cover body 1, wherein the foreign matters include, but are not limited to, dust, fine particles, bacteria and viruses. The exhaust valve 5 is arranged in the exhaust hole 13 and can prevent external air from entering the inlet cover body 1 from the exhaust hole 13; the controller is respectively electrically connected with the first fan 2 and the second fan 3 and is used for controlling the forward rotation and the reverse rotation of the corresponding fans, and the first fan 2 and the second fan 3 are powered by batteries. The controller and the battery are fixed on the shoulders, the arms, the waist or the jacket pocket of a wearer, and the carrying is convenient.

In this embodiment, the protective cover 6 is disposed outside the filter member 4. The protective cover 6 is provided with a vent hole 7, and the protective cover 6 is fixedly connected with the first air inlet and outlet hole 11 and the second air inlet and outlet hole 12 to prevent the first fan 2, the second fan 3 and the filtering piece 4 from being separated from the corresponding air inlet and outlet holes.

In this embodiment, the exhaust valve 5 is a one-way valve; the exhaust valve 5 comprises a valve body 51 and a valve fixing piece 52, wherein the valve body 51 is matched with the exhaust hole 13 through the valve fixing piece 52; accordingly, the valve fixing member 52 is provided with a vent hole 7 as a passage for discharging gas from the mask body 1. The one-way valve only allows air in the mask main body 1 to be discharged through the exhaust valve, and does not allow external air to enter the mask main body through the exhaust valve. Further, the valve body 51 is preferably a rubber sealing sheet.

In this embodiment, the filter member 4 includes one or more of a meltblown fabric layer, a composite fiber layer, a HEPA particle filter, and an activated carbon filter. The melt-blown cloth layer is made of polypropylene serving as a main raw material, the fiber diameter is 1-5 micrometers, and the superfine fibers with unique capillary structures increase the number and the surface area of fibers in unit area, so that the melt-blown cloth has good filtering property, shielding property, heat insulation property and oil absorption property, and can be used in the fields of air, liquid filtering materials, isolating materials, absorbing materials, mask materials, heat-insulating materials, wiping cloth and the like. Wherein, the composite fiber layer can effectively filter formaldehyde, peculiar smell and PM2.5 micro particles. The HEPA particle filter screen is a multi-layer folding filter screen, the filtering function of the HEPA particle filter screen is in direct proportion to the surface area of the HEPA particle filter screen, the HEPA particle filter screen is unfolded, the unfolded area is increased by 15 times compared with the folded area, the HEPA particle filter screen can filter particles smaller than 0.3 micrometer in the air, such as bacteria, viruses, fungal spores, pollen, asbestos and the like suspended in the air, the filtering rate at least reaches 99.97 percent, and the HEPA particle filter screen is widely applied to hospitals, laboratories, precision production workshops and other places with strict air quality requirements. The active carbon filter screen can effectively filter and purify air peculiar smell and harmful chemical pollutants, such as formaldehyde, benzene compounds, ammonia and the like.

In this embodiment, the shape of the mask body 1 is adapted to the mouth and nose of a human body, and the sealing rings 14 are disposed around the mask body 1 to prevent outside air from entering the mask body 1. Both sides of the mask body 1 are connected with ear straps (not shown), and the ear straps are connected with the mask body 1 through fixing holes 15.

In this embodiment, the first air inlet/outlet hole 11 and the second air inlet/outlet hole 12 are respectively located at two sides of the mouth and nose portion of the human body, and the exhaust hole 13 is located below the mouth and nose portion of the human body.

The first fan 2 and the second fan 3 of the utility model can be operated in forward direction and reverse direction, and can be operated at high speed and low speed, namely, the rotation direction and the rotation speed of the fans can be adjusted; when the first fan 2 and the second fan 3 are in a positive rotation state, air is injected into the mask main body 1, and meanwhile foreign matters in the air are intercepted outside the filter piece 4; when the first fan 2 and the second fan 3 rotate forwards at high speed, the air suction amount of a wearer can be ensured, and the air suction resistance is reduced; when the first fan 2 and the second fan 3 rotate forwards at a low speed, the pressure of the wearer during expiration can be reduced, and the expiration resistance can be reduced. When the first fan 2 or the second fan 3 is rotated reversely, the air in the mask body 1 is discharged through the corresponding air inlet and outlet holes, and dust, micro particles, bacteria, viruses and the like intercepted outside the filter piece 4 are blown off.

In this embodiment, the motors of the first fan 2 and the second fan 3 are dc brushless variable frequency motors, and the sound is as low as 26 db during operation.

In this embodiment, the controller may be a single chip microcomputer or a programmable controller. Furthermore, the controller is provided with a control button or a touch screen for selecting on/off, setting mode and setting mode parameters. The controller is provided with three modes of operation:

one mode is a constant speed mode, namely the first fan 2 and the second fan 3 simultaneously or independently supply air into the mask main body 1 in a constant speed and continuous forward rotation mode; in the constant speed mode, the rotating speeds V1 of the first fan 2 and the second fan 3 are required to be set through the controller;

the second mode is a pulse mode, namely, the first fan 2 and the second fan 3 simultaneously or independently and continuously supply air to the mask main body 1, and the running speeds of the first fan 2 and the second fan 3 are circularly and pulse-type changed from high to low and then from low to high to positively turn to the mask main body 1 to supply air; in the pulse mode, the controller is required to set a high speed V2 of the fan, a high speed continuous operation time length T2 of the fan, a low speed V3 of the fan and a low speed continuous operation time length T3 of the fan;

and thirdly, in the backwashing mode, after the first fan 2 and the second fan 3 continuously rotate forward for a set time, the first fan 2 keeps rotating forward, the second fan 3 is changed into rotating backward, or the first fan 2 is changed into rotating backward while the second fan 3 keeps rotating forward, and in the backwashing mode, the corresponding fan continuous forward rotation time length T4, forward rotation speed V4, fan reverse rotation speed V5, fan reverse rotation time length T5 and fan reverse rotation times N need to be set through the controller.

Of course, the above-mentioned pulse mode and the back-flushing mode can be operated in combination, and the controller can monitor the operation states of the first fan 2 and the second fan 3, and when one of the fans fails to operate, the controller can control the other fan to enter the constant-speed mode.

In specific use, after the mask is worn at the mouth and the nose, the controller is used for setting an operation mode or a combined mode and then is fixed on the shoulders of a wearer.

When the constant speed mode is selected, when the first fan 2 singly supplies air into the mask main body 1 in a constant speed forward rotation mode, the first fan 2 continuously supplies air into the mask main body 1 in a forward rotation mode at a speed of V1, external air enters the main body 1 through the protective cover 6, the filter piece 4 and the first fan 2 through the first air inlet and outlet hole 11 to be inhaled by a wearer, and air exhaled by the wearer and residual air after inhalation are exhausted from the exhaust hole 13 through the exhaust valve 5; similarly, when the second fan 3 alone supplies air in the constant-speed forward rotation mask body 1, or when the first fan 2 and the second fan 3 simultaneously supply air in the constant-speed forward rotation mask body 1, the same situation as the above-mentioned case that the first fan 2 supplies air in the constant-speed forward rotation mask body 1 is adopted, and the details are not repeated here.

When a user selects a pulse mode by using the controller, the first fan 2 operates alone, the second fan 3 is in a stop operation state, the first fan 2 operates at a high speed V2 firstly, the low speed V3 is reduced to operate when the continuous high speed V2 reaches T2, and the high speed V2 is increased again when the continuous low speed V3 reaches T3, so that the first fan 2 continuously and cyclically changes to operate in a continuous forward rotation mode between the high speed V2 and the low speed V3; when the wearer selects the pulse mode by using the controller and the second fan 3 operates alone, the first fan 2 is in the stop operation state, the second fan 3 is firstly operated at the high speed V2, and is reduced to the low speed V3 when the continuous operation time reaches T2, and is increased to the high speed V2 when the continuous low speed V3 reaches T3, so that the second fan 3 is always operated in the continuous forward rotation mode in a cyclic change mode between the high speed V2 and the low speed V3.

When the controller is used by a wearer to select the pulse mode to simultaneously operate the first fan 2 and the second fan 3, the first fan 2 and the second fan 3 are simultaneously operated at the high speed V2, the continuous operation time reaches T2, the low speed V3 is reduced, and the continuous operation time reaches T3, the high speed V2 is increased again, so that the first fan 2 and the second fan 3 are continuously and cyclically changed to be operated in the continuous forward rotation mode between the high speed V2 and the low speed V3. When the pulse mode operation is selected by the wearer by using the controller, the corresponding continuous operation time length T2 of the fan high-speed V2 is set to be consistent with the inhalation time length of the wearer, the corresponding continuous operation time length T3 of the fan low-speed V3 is set to be consistent with the exhalation time length of the wearer, and the air supply quantity of the corresponding fan in the high-speed V2 operation process can ensure the requirement of the inhalation quantity of the wearer.

When the respirator operates in a pulse mode, the first fan 2 and the second fan 3 are always in positive rotation and do not rotate reversely, so that dust, tiny particles, bacteria and viruses are intercepted outside the filter piece 4 when outside air enters the respirator body 1, the inhalation safety of a wearer is ensured, meanwhile, when the wearer inhales air, the first fan 2 and/or the second fan 3 carry out high-speed V2 operation to inflate the respirator body 1, the air supply amount in the respirator body 1 is large, the air supply pressure is high, the wearer can easily inhale air, when the wearer exhales air, the first fan 2 and/or the second fan 3 carry out low-speed V3 operation to inflate the respirator body 1, the air supply amount in the respirator body 1 is small, the air supply pressure is low, and the wearer can easily exhale air.

When the wearing person selects the back washing mode to operate by using the controller, the first fan 2 keeps rotating forwards when the continuous forward rotation time of the first fan 2 and the second fan 3 reaches T4 at the speed of V4, the second fan 3 rotates reversely at the speed of V5, and then the outside air enters the inlet cover main body 1 from the first air inlet/outlet hole 11 through the protective cover 6, the filter element 4 and the first fan 2 to be inhaled by the wearing person, wherein dust, tiny particles, bacteria and viruses in the outside air are intercepted on the outer side of the filter element 4, so that the quality and safety of inhalation of the wearing person are ensured; the air exhaled by the wearer during expiration and the air injected by the first fan 2 are exhausted through the second air inlet/outlet hole 12, the second fan 3, the filter element 4 and the protective cover 6, so that when the air passes through the filter element 4 from inside to outside, dust, tiny particles, bacteria and viruses on the outer side of the filter element 4 can be washed away and taken away; when the continuous reverse rotation operation time of the second fan 3 reaches T5, the second fan 3 is changed to rotate at the speed V4 in the forward rotation mode, and simultaneously the first fan 2 is changed to rotate at the speed V5 in the reverse rotation mode, and then the outside air enters the mask body 1 from the second air inlet/outlet hole 12 through the protective cover 6, the filter element 4 and the second fan 3 to be inhaled by the wearer, wherein dust, tiny particles, bacteria and viruses in the outside air are intercepted on the outer side of the filter element 4, and the quality and the safety of inhalation of the wearer are ensured. The air that the person of wearing exhales when exhaling and the air that second fan 3 injected are discharged through first air inlet and outlet 11, first fan 2, filter piece 4, protection casing 6, and the air will wash away the dust, tiny particle, bacterium, the virus of filtering the piece 4 outside when filtering piece 4 from inside to outside like this. When the continuous reverse rotation time length of the first fan 2 reaches T5, the first fan 2 is changed to rotate in the forward rotation mode at the speed V4, the second fan 3 is changed to rotate in the reverse rotation mode at the speed V5, when the sum of the reverse rotation times of the first fan 2 and the second fan 3 reaches N times, the first fan 2 and the second fan 3 are all changed to rotate in the forward rotation mode and continuously operate at the speed V4, and when the continuous forward rotation time length of the first fan 2 and the second fan 3 reaches T4, the first fan 2 is changed to rotate in the reverse rotation mode again, so that the first fan 2 and the second fan 3 alternately operate in the forward rotation mode and the reverse rotation mode.

When a user selects the pulse mode and the back washing mode to operate in a combined mode by using the controller, the first fan 2 and the second fan 3 firstly operate according to the pulse mode, when the pulse mode operation time length reaches T4, the first fan 2 and the second fan 3 are changed into the back washing mode to operate, when the sum of the reverse rotation times of the first fan 2 and the second fan 3 is equal to N, the pulse mode operation is changed into the pulse mode operation again, and therefore the first fan 2 and the second fan 3 are operated circularly and alternately between the pulse mode and the back washing mode all the time.

In this embodiment, the controller 7 can monitor the operation states of the first fan 2 and the second fan 3, and when one of the fans stops operating, the controller 7 controls the other fan to enter the constant speed mode; the air in the mask body 1 is discharged through the air inlet and outlet hole and the air outlet hole 13 at the position of the stop fan, so that the foreign matters intercepted outside the filter piece 4 can be blown off. The fan out of service condition includes the reason for the fan failure and the reason for the controller to control the fan to be inoperative.

Further, when the exhaust hole 13 is sealed by a nut, the gas in the mask body 1 sequentially passes through the air inlet and outlet hole at the fan stopping operation and is discharged from the filtering piece 4, so that the back washing of the filtering piece 4 is realized, and the foreign matters intercepted outside the filtering piece 4 are blown off.

In addition, when the controller monitors that the first fan 2 has a fault, the controller sends an instruction to control the second fan 3 to operate in a constant speed mode; on the contrary, when the controller monitors that the second fan 3 is out of order, the controller sends an instruction to control the first fan 2 to operate in the constant speed mode.

In summary, the utility model injects air into the mask body through the positive rotation of the fan, thereby reducing the inhalation resistance of the wearer and ensuring the inhalation quality and safety of the wearer; the dust, tiny particles, bacteria and viruses intercepted outside the filtering piece are blown off through the reverse rotation of the fan, so that the filtering effect and the service life of the filtering piece are improved. In addition, when one fan of the two fans stops running, the other fan enters a constant speed mode to run, the purpose of backwashing can be achieved, and particularly, the exhaust hole is better sealed by a screw cap.

It is to be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth herein. The present invention is capable of other embodiments and of being practiced and carried out in a variety of ways. The foregoing variations and modifications fall within the scope of the present invention. It will be understood that the invention disclosed and defined herein extends to all alternative combinations of two or more of the individual features mentioned or evident from the text and/or drawings. The embodiments described herein explain the best modes known for practicing the invention and will enable others skilled in the art to utilize the invention.

Claims

1. A blowback filter mask, comprising at least:

the mask comprises a mask body, wherein the mask body is at least provided with two air inlet and outlet holes and an exhaust hole;

the fan is arranged in the air inlet and outlet hole;

2. The blowback filter mask of claim 1 further comprising a protective shield positioned outside said filter element.

3. The reverse blowing filter mask of claim 1 wherein said exhaust valve includes a valve body and a valve retainer, said valve body cooperating with said exhaust vent through said valve retainer.

4. The blowback filter mask of claim 1 or 2 wherein said filter comprises one or more of a meltblown layer, a composite fiber layer, a HEPA particulate filter, and an activated carbon filter.

5. The reverse blowing filter mask of claim 1 wherein said mask body is shaped to fit the nose and mouth of a human body and said mask body is provided with a seal around the perimeter to prevent the ingress of ambient air from the perimeter of the mask body.

6. The reverse blowing filter mask of claim 1 wherein said fan is capable of operating in both forward and reverse directions, and is capable of operating at high and low speeds, i.e., the fan is adjustable in both rotational direction and rotational speed;

7. The reverse blowing filter mask of claim 1 or 6 wherein the fan comprises a first fan and a second fan, wherein the first fan is mounted in the first inlet and outlet aperture and the second fan is mounted in the second inlet and outlet aperture.

8. The reverse blowing filter mask of claim 7 wherein when air is injected into the mask body in a forward direction of the first fan, foreign matter in the air is trapped outside the filter element of the first fan and clean air is provided for the wearer to inhale;

9. The reverse blowing filter mask according to claim 7 wherein when the first fan rotates in a forward direction and the second fan rotates in a reverse direction, air injected by the first fan and air exhaled by the wearer are sucked away by the second fan and exhausted through the second air inlet/outlet, and foreign matter trapped outside the filter element of the second fan is blown away;

10. The reverse blowing filter mask of claim 2 wherein the protective shield is provided with air vents, the protective shield being fixedly connected to the air inlet and outlet to prevent the fan and filter elements from being removed from the air inlet and outlet.