CN103223214A - Semi-open type positive-pressure air supplying and purifying helmet shield - Google Patents
Semi-open type positive-pressure air supplying and purifying helmet shield Download PDFInfo
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- CN103223214A CN103223214A CN2013100851220A CN201310085122A CN103223214A CN 103223214 A CN103223214 A CN 103223214A CN 2013100851220 A CN2013100851220 A CN 2013100851220A CN 201310085122 A CN201310085122 A CN 201310085122A CN 103223214 A CN103223214 A CN 103223214A
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Abstract
The invention discloses a semi-open type positive-pressure air supplying and purifying helmet shield which comprises a helmet, a shield, a power unit, an air filtering device and an air pressure and voltage alarm device as well as a static pressure box, wherein the shield is arranged in front of the helmet; a shield body extends downward to cover outside a human face; a gap is formed between the shield and the human face; the power unit comprises a fan and a power supply; the static pressure box, the power unit and the air filtering device are the arranged in the helmet; two ends of the static pressure box are an air inlet end and an air outlet end respectively; a blow-off nozzle facing downward is arranged at the front edge of the helmet; the fan in the power unit and the air filtering device are arranged in middle of the static pressure box and at the air inlet end respectively; and the air filtering device is a filter with a filter element made of an electret air filtering material. The helmet shield has functions of preventing dust, waste gas and bacterial virus, no other external connection pipeline device is required to be carried, the structure is simple, a user can conveniently wear the helmet shield and breathe smoothly and comfortably with the helmet shield.
Description
Technical field
The present invention relates to faceplate, be specifically related to a kind of forced draft semi open model faceplate that purifies air.
Background technology
Along with the generation of RDs such as SARS, bird flu and popular, and the dust of atmospheric environment, waste gas etc. pollute aggravation, and people more and more recognize the importance of respiratory protection and respiratory health, and protective respirator receives increasing concern for this reason.Although but relevant respiratory protective equipment has experienced the development in a century nearly, still is difficult at present enter in the middle of the daily life, even be difficult to when the protection epidemic situation, play a role.Tracing it to its cause, is because present respiratory protective equipment exists following shortcoming and problem:
1. no matter being the gas mask of the simplest mouth mask down to complexity, all is sealed basically, greatly the comfortableness of influence breathing;
2. general articles for use protection effect is not good, adopts the self-absorbing filtering type structure usually, and its air-tightness and security are relatively poor, can only prevent the part dust and can not protect relevant bacterial virus or exhaust emission.And can protect the isolation type equipment that is generally of relevant bacterial virus or exhaust emission, it is bulky, bulky complex costs an arm and a leg, and must the traction compressed gas cylinder and the long tube that purifies air of conveying, wear use with action all very inconvenient.
3. the power blast type air cleaning face shield that occurs recently also must wear numerous and jumbled parts such as breeze fan, respiratory siphon and driving power on one's body in addition, and major part also can only be prevented dust and can not be protected relevant virus and bacterium.
For this reason, people need a kind of new type purification air device, and the dust of can preventing that it should have large-scale in the past respiratory protective equipment concurrently just has can protect safeguard functions such as relevant bacterial virus or exhaust emission again, and it is light and handy convenient, price is suitable, and good looking appearance is breathed comfortable freely suitable.Not only be suitable for medical worker, traffic police and road administration personnel etc. and be in the personnel that work under highly infective or the high dust exhaust environment throughout the year, also can be common people in order to breathe usefulness that safety is found pleasure in.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of forced draft semi open model faceplate that purifies air is provided, this faceplate can blow the positive pressure purification air to the wearer, the function that has anti-dust waste gas and bacteriological protection virus simultaneously, and simple in structure, lightly attractive in appearance, wear conveniently, breathe smooth along comfortable.
The present invention realizes that the technical scheme of above-mentioned purpose is:
A kind of forced draft semi open model faceplate that purifies air, comprise the helmet, face shield, power set, air filter and air pressure and voltage alarm device, wherein, described face shield is arranged on the front portion of the helmet, face shield body extension downwards covers in outside the human face, has the gap between face shield and the human face; Described power set comprise blower fan and power supply; It is characterized in that:
Also comprise plenum chamber, this plenum chamber and described power set, air filter and air pressure and voltage alarm device all are arranged in the helmet, and wherein, the two ends of described plenum chamber are respectively air intake and outlet air end, and wherein outlet air end is positioned at the front portion of the helmet; The leading edge place of the described helmet is provided with blowing mouth down, and this blowing mouth is communicated with the outlet air end of plenum chamber;
Blower fan in the described power set and air filter are arranged at the middle part and the air intake of plenum chamber respectively, and wherein, described air filter is for using the filter of electret air filtering material as filter core.
A preferred version of the present invention, wherein, the described helmet double-decker that outer helmet shell and interior helmet shell combine of serving as reasons, form mezzanine space between outer helmet shell and the interior helmet shell, its gap is 15～25mm, and described plenum chamber, power set, air filter and air pressure and voltage alarm device all are arranged in this mezzanine space.Whole faceplate is any extension tube attached of traction, line or other external equipment not, only stays a power source charges socket, uses to power source charges with work.
A preferred version of the present invention, wherein, described plenum chamber is the smooth circular arc passage of inner surface, the top that this circular arc passage strides across the helmet by the rear portion of the helmet extends to the front portion of the helmet.
A preferred version of the present invention, wherein, described blowing mouth is the circular arc opening along the leading edge setting of the helmet.
A preferred version of the present invention, wherein, the length of described circular arc opening is slightly larger than the length of wearer's left eye outer rim to the right eye outer rim.
A preferred version of the present invention, wherein, the cover body with shape of face slick and sly arc-shaped curved surface of described face shield for making, this face shield and the described helmet by the high transparent PVC of preventing atomization combine formation to the wearer from forehead down to its chin and covering curtain shape positive pressure purification air-flow drainage channel to two ectocanthion and cheek.
A preferred version of the present invention, wherein, the length of described plenum chamber is 80～125mm, its cross section sectional area is 256～976mm
2The wind speed of the wind that described blowing mouth blows out is 0.28m/s～0.31m/s, and forms the curtain shape wind band of range greater than 15cm.
A preferred version of the present invention, wherein, described electret air filtering material is electret static synthetic fibers filtering materials.
A preferred version of the present invention, wherein, described air pressure and voltage alarm device comprise pressure capsule system and voltage sensor system, wherein, pressure capsule system comprises be used to detect the pressure sensor of plenum chamber internal gas pressure and the pressure early warning circuit that gives the alarm when the required working resistance of filter is excessive; Described voltage sensor system comprises be used to detect power source voltage and voltage detecting that gives the alarm and early warning circuit when brownout; Described pressure early warning circuit comprises reference power supply, phase inverter, multivibrator and the buzzer that connects successively; Described voltage detecting comprises sample circuit, phase inverter, multivibrator and the buzzer that is connected successively with early warning circuit.
A preferred version of the present invention, wherein, described power supply is that output voltage is the chargeable miniature lithium battery group of 10V, capacity 〉=2700mAh, described blower fan be the air quantity excursion between 13CFM～20CFM and static current of lcd be not more than the low-power consumption blower fan of 280mA.
Operation principle of the present invention is: drive air after the blower fan work and flow, under the pressurization of plenum chamber, set up enough pressure differentials in the filter both sides, make air to use the filter of electret air filtering material preferably by strainability as filter core, air is by this filter the time, because electrostatic adsorption, airborne grit and the bacterium that adheres to thereof, virus are by filtering; Cleaned air passes is carried downwards for the user from blowing mouth with enough big wind speed and is breathed, should be meant the enough big normal pressure of generation in the space that is enough between face shield and user face by enough big wind speed, prevent to enter the gap of extraneous air before user's face and face shield edge, but this wind speed can be greatly to making the user do not feel like oneself, be generally 0.28m/s～0.31m/s, and range is contained all organs (mouth, nose, eye) relevant with breathing of wearer greater than 15cm to arrive wearer's chin position; Make the wearer only breathe purifying air that it provides, and do not allow the air of external contamination enter, thereby reach not only filtering bacterium, virus but also get rid of the effect of dust, waste gas.
The design of several sections of the present invention and work are to cooperatively interact, and is all linked with one another.At first select the filter of electret air filtering material, guarantee efficient Chalk-dust filtering waste gas and bacterial virus simultaneously as filter core; Even but skilled in the art will recognize that and use electret air filtering material as the filter of filter core Chalk-dust filtering and bacterial virus simultaneously, can be owing to the electret air filtering material air-tightness is better, must provide enough big pressure reduction just can make air from wherein passing through, and if with this filter application on faceplate, just need on user's body, wear numerous and jumbled parts such as high-power powerful breeze fan, respiratory siphon and driving power in addition, must cause complex structure, use inconvenience; And the present invention is provided with plenum chamber in the helmet, the enough blast of also convertible acquisition make air pass through filter under the miniature low-power consumption blower fan situation using can to make the present invention by plenum chamber, and still can keep the wind speed of 0.28m/s～0.31m/s after by filter.And just because of having adopted miniature low-power consumption blower fan, just make the present invention can adopt minicell to maintenance reach 8 hours the power supply operate as normal, could make that also all these parts all can be placed in the helmet, not be with external wind regime of pipeline or power supply in addition and do not need to involve; Make the present invention not only have the function of anti-dust waste gas and bacteriological protection virus simultaneously, and simplified structure, it is quite convenient to use.
The present invention compared with prior art has following beneficial effect:
1, the present invention has the function of anti-dust waste gas and bacteriological protection virus simultaneously, and all parts all are arranged in the helmet, need not to connect complicated external device (ED), need not any external line equipment of traction, and not only appearance is succinct, uses also very convenient.And have only bulky, bulky complex in the prior art, cost an arm and a leg and use inconvenient large-scale protective device for respiration just to have the function of anti-dust and bacteriological protection virus simultaneously.
2, the present invention is a forced draft semi open model faceplate, fresh air after will filtering on one's own initiative is sent to user's snout, the user need not cover mouth and nose, can breathe swimmingly naturally, and comfortableness strengthens greatly, especially air outlet is the circular arc opening along the leading edge setting of the helmet, cleaned air passes is blowed downwards with 0.28m/s～0.31m/s wind speed, form range and be＞the curtain shape wind band of 15cm, make air-flow even, feel comfortable, effect is better.
3, can adopt miniature low-power consumption blower fan, miniature long-acting rechargeable battery, the back of can once charging is long-time to break away from the external power source continuous operation more than 8 hours, can be suitable for using under various occasions.Not only be suitable for regular traffic police, road administration and the relevant workshop staff who is under the dust ash haze exhaust emission environment, also be suitable for the medical personnel of hospital and the health and epidemic prevention personnel wear use.Particularly it is lightly attractive in appearance, wear conveniently, also is suitable for general public and uses in occasions such as the motorcycle of riding, bicycles.
4, possess cell voltage safe early warning and filter and change warning function, the prompting user is lower than normal working voltage at supply voltage, and filter is too many because of laying dust, when causing working resistance excessive it is changed or charges.Can guarantee that user's faceplate when wearing faceplate of the present invention is in the duty of normal dedusting bacteriological filtration.
But grit and the bacterial virus of 5, the present invention's filtering 〉=0.5 μ m.And prove after measured, under the external environment of slight pollution, wear under the faceplate person nose of the present invention and mouthful between, the air purification effect at cheek place, eyes exterior angle and each position of chin in the nose outside can reach the level that purifies air of 4 grades of ten grades of GBs (GB/T16292) or international standards, bacterial population is zero.Even under the external environment situation of severe contamination, its clean-up effect still can reach ten thousand grades of purification levels, reaches the effect of very desirable filtration, purification air.
Description of drawings
Fig. 1～Fig. 4 is the purify air structural representation of a specific embodiment of faceplate of forced draft semi open model of the present invention, and wherein, Fig. 1 is front view (complete section), and Fig. 2 is left view (complete section), and Fig. 3 is a upward view, and Fig. 4 is a partial perspective view.
Fig. 5 is the purify air electrical schematic diagram of pressure early warning circuit in the faceplate of forced draft semi open model of the present invention.
Fig. 6 is the purify air electrical schematic diagram of voltage detecting and early warning circuit in the faceplate of forced draft semi open model of the present invention.
Schematic diagram when Fig. 7 carries out measure of merit for faceplate that forced draft semi open model of the present invention is purified air is worn on the emulation head mould.
The specific embodiment
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing, but embodiments of the present invention are not limited thereto.
Referring to Fig. 1～Fig. 4, the forced draft semi open model of the present invention faceplate that purifies air mainly is made up of the helmet 1, face shield 2, power set, air filter, plenum chamber 4 and air pressure and voltage alarm device, wherein:
The described helmet 1 double-decker that outer helmet shell 11 and interior helmet shell 12 combine of serving as reasons is the mezzanine space of a sealing between the two.This helmet 1 is by the engineering plastics manufacturing, and its size is according to head part's shape and average size design, and its rigidity meets the relevant shock resistance standard of country.The gap of mezzanine space is 15～25mm, is used to place power set, air filter, plenum chamber 4 and air pressure and voltage alarm device.
Described face shield 2 is arranged on the front portion of the helmet 1, and face shield 2 bodies extension downwards cover in outside the human face (comprising from forehead down to the zone between chin and the eyes exterior angle, the left and right sides), have the gap between face shield 2 and the human face; This face shield 2 preventing atomization transparent cover that high transparent PVC is made of serving as reasons, its surface are the slick and sly arc-shaped curved surface of shape of face.This face shield 2 stops that except that plaing a part extraneous air directly blows to user's mouth and nose, with the described helmet 1 combine formation to the wearer from forehead down to its chin and cover curtain shape positive pressure purification air-flow drainage channel to two ectocanthion and cheek.During work, the speed of described positive pressure purification air-flow is preferably 0.28m/s～0.3m/s, and operating distance is＞15cm (being the distance of common people's forehead to mouth); Make this positive pressure purification air-flow make the wearer breathe the air while of pure and fresh purification, air virus and the bacterium that can blow the retaining external environment condition can not enter its breathing path.The purifying gas flow of about in addition 0.3m/s wind speed can not cause the discomfort of wearer's skin etc., and the wearer is felt as Mu Chunfeng, and very comfortable, particularly in summer, this purifying gas flow can also play refrigerant cool effect.Generally, can make wearer's breathing safety, comfortable, clean.
Described power set comprise blower fan 5 and power supply, and wherein, blower fan 5 adopts miniature low-power consumption blower fan 5, MAGIC4012VB-C28 type mixing blower fan for example, and its air quantity excursion is between 13CFM～20CFM, and static current of lcd is not more than 280mA.Power supply adopts minicell group 101 in chargeable long cruising time, and for example capacity is 〉=the lithium ion battery group of 2700mAh, can provide 〉=DC voltage of 10V, can guarantee that blower fan 5 continuous operations reached more than 8 hours.
Described air filter is for using the filter 7 of electret air filtering material as filter core 8, and wherein, electret air filtering material is electret static synthetic fibers filtering materials.Filtering when it utilizes electrostatic interaction to realize bacterium, virus, waste gas and dust, to the filter efficiency of the 0.5 above particle of μ m particle diameter and bacterium, virus more than 99.99%.The working life of the filter core 8 of electret air filtering material filter is worked in the environment of slight pollution, is more than 7 years, even work in the environment of serious pollution, the life-span also will be longer than half a year.
Described plenum chamber 4 is arranged in the mezzanine space, and its two ends are respectively air intake and outlet air end, and wherein outlet air end is positioned at the front portion of the helmet 1, and air intake is positioned at the rear portion of the helmet 1; Particularly, this plenum chamber 4 is the smooth circular arc passage of inner surface, and the top that this circular arc passage strides across the helmet 1 by the rear portion of the helmet 1 extends to the front portion of the helmet 1.Described circular arc passage forms in the following manner: be provided with the wallboard 41 that two rear portions from the helmet 1 are crossed over the top of the helmet 1 and extended to the front portion of the helmet 1 in the described mezzanine space, the inner surface of the inner surface of this two wallboard 41 and outer helmet shell 11 between this two wallboard 41 and interior helmet shell 12 constitutes the circular arc air flue of smooth seal jointly.Usually the length of this circular arc passage is that 80～125mm, cross-sectional area are 256～976mm
2The time pressurized effect better, in the present embodiment, the length of getting the circular arc passage is 100mm, cross-sectional area is 400mm
2In addition, described circular arc passage also can be to be made of parts that are independent of outer helmet shell and interior helmet shell, and for example the inner chamber by the circular arc pipeline that forms by injection moulding constitutes, and this circular arc pipeline is fixedly connected in the mezzanine space.
The leading edge place of the described helmet 1 is provided with blowing mouth 6 down, and this blowing mouth 6 is communicated with the outlet air end of plenum chamber 4.Particularly, this blowing mouth 6 is arranged between the circular edge of the outer helmet shell of the helmet 1 front portion and interior helmet shell, this air outlet is that the length of this circular arc opening is slightly larger than the length of wearer's left eye outer rim to the right eye outer rim along the circular arc opening of the leading edge setting of the helmet 1.
Referring among Fig. 1 shown in the arrow, during work, under the pressurization of blower fan 5 and plenum chamber 4, extraneous air passes filter 7 and enters plenum chamber 4 through the air intake of plenum chamber 4, and through the outlet air end output of plenum chamber 4 backs from plenum chamber 4, blow out downwards from blowing mouth 6 at last, form curtain shape wind band.
Referring to Fig. 5 and Fig. 6, described air pressure and voltage alarm device comprise pressure capsule system and voltage sensor system, wherein:
Referring to Fig. 5, pressure capsule system comprises be used to detect the pressure sensor 9 of plenum chamber 4 internal gas pressures and the pressure early warning circuit that gives the alarm when the required working resistance of filter is excessive, described pressure sensor 9 is higher than the electronic pressure transmitter of 10pa for precision, be used to respond to the operating pressure in the plenum chamber 4, too much at filter 7 laying dusts, when causing working resistance greater than 240Pa, i.e. touch switch effect.Described pressure early warning circuit comprises reference power supply, phase inverter, multivibrator and buzzer 102.Under the situation of filter 7 operate as normal, its working resistance is less than 240Pa, so the electronic pressure transmitter in parallel with reference power supply is in off state, to the phase inverter input is high level, behind phase inverter, be output as low level, multivibrator can not be worked, and can not produce oscillator signal, and buzzer 102 does not sound the alarm; But it is too many to work as filter 7 laying dusts, when causing working resistance greater than 240Pa, electronic pressure transmitter promptly is in "on" position, give the phase inverter input low level, behind phase inverter, be output as high level, thereby start multivibrator work and produce the output square-wave signal, trigger buzzer 102 and send chimes of doom, change filter 7 with the prompting user.
Referring to Fig. 6, the voltage sensor system comprises is used to detect power source voltage and voltage detecting that gives the alarm and early warning circuit that when brownout this voltage detecting and early warning circuit comprise sample circuit, phase inverter, multivibrator and buzzer 102.Sample circuit is connected in parallel on battery pack 101 outputs to gather battery pack 101 voltages; When battery pack 101 voltages during at 〉=10V, the voltage signal of the battery pack 101 that collects is a high level, is output as low level behind phase inverter, and multivibrator can not be worked, and can not produce oscillator signal, and buzzer 102 does not sound the alarm; When detecting battery pack 101 output voltages near the starting voltage of blower fan 5 (＜10V), battery pack 101 voltage signals that collect are low level, behind phase inverter, be output as high level, thereby start multivibrator work and produce the output square-wave signal, trigger buzzer 102 and send chimes of doom, change battery pack 101 or give battery pack 101 chargings with the prompting user.
Referring to Fig. 1, above-mentioned pressure sensor 9, buzzer 102, battery pack 101 and relevant circuit board 10 and lead all are arranged in the mezzanine space; Any pipe of traction, line only stay a power source charges socket with external other wind regime power supplys to the user wearing when using again, use to power source charges doing, thus lightly attractive in appearance, be convenient to wear.
Below in conjunction with concrete experiment the effect of forced draft semi open model faceplate of the present invention is done further checking.
Referring to Fig. 7, forced draft semi open model faceplate of the present invention is worn on the emulation head mould, and it is inserted in the glass box of the wide spectrum aerosol generator that has special imitation atmosphere pollution, (concentration of suspended particulate is about 3 * 10 in the air by international standard the slight pollution environment to be set respectively
5Individual/L); (concentration of suspended particulate is about 10 to the intermediate pollution environment in the air
7Individual/L); And the environment of severe contamination (concentration of suspended particulate is about 10 in the air
9Individual/L).Purify air under the faceplate working condition starting forced draft semi open model of the present invention then, the gas velocity of nose, mouth, chin and eyes exterior angle, both sides of wearing head mould and cheek place each point and bacterium and grit and aerosol amount are measured.Income effect is: the wind speed of each point is all between 0.28～0.3m/s.The particle diameter of each point is that 0.5 μ m to 5 μ m grit and aerosol amount are less than 350/m under the slight pollution environment
3, particle diameter is zero greater than 5 μ m grits and aerosol amount, and every m in the air
3Swim the bacterium number and in 30 minutes the sedimentation bacterium number of every collection ware also be zero, be better than ten grades of levels of GB cleanliness factor.Under the intermediate pollution environment, 0.5 μ m to the 5 μ m grit and the aerosol amount of each point are less than 3385/m
3, be zero greater than 5 μ m grits and aerosol amount, and the bacterium number/m that swims in the air
3And sedimentation bacterium/ware 30min also is zero, is better than hundred grades of levels of GB cleanliness factor.Even under the environment of severe contamination, the air purity of each point also is much better than ten thousand grades of levels of GB cleanliness factor.Guarantee that the wearer can both breathe the very air of sanitary safe under various contaminated environment.
Above-mentioned is preferred implementation of the present invention; but embodiments of the present invention are not subjected to the restriction of foregoing; other any do not deviate from change, the modification done under spiritual essence of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (10)
1. forced draft semi open model faceplate that purifies air, comprise the helmet, face shield, power set, air filter and air pressure and voltage alarm device, wherein, described face shield is arranged on the front portion of the helmet, face shield body extension downwards covers in outside the human face, has the gap between face shield and the human face; Described power set comprise blower fan and power supply; It is characterized in that:
Also comprise plenum chamber, this plenum chamber and described power set, air filter and air pressure and voltage alarm device all are arranged in the helmet, and wherein, the two ends of described plenum chamber are respectively air intake and outlet air end, and wherein outlet air end is positioned at the front portion of the helmet; The leading edge place of the described helmet is provided with blowing mouth down, and this blowing mouth is communicated with the outlet air end of plenum chamber;
Blower fan in the described power set and air filter are arranged at the middle part and the air intake of plenum chamber respectively, and wherein, described air filter is for using the filter of electret air filtering material as filter core.
2. the forced draft semi open model according to claim 1 faceplate that purifies air, it is characterized in that, the described helmet double-decker that outer helmet shell and interior helmet shell combine of serving as reasons, form mezzanine space between outer helmet shell and the interior helmet shell, its gap is 15～25mm, and described plenum chamber, power set, air filter and air pressure and voltage alarm device all are arranged in this mezzanine space.
3. the forced draft semi open model according to claim 2 faceplate that purifies air is characterized in that described plenum chamber is the smooth circular arc passage of inner surface, and the top that this circular arc passage strides across the helmet by the rear portion of the helmet extends to the front portion of the helmet.
4. the forced draft semi open model according to claim 1 faceplate that purifies air is characterized in that, described blowing mouth is the circular arc opening that the leading edge along the helmet is provided with.
5. the forced draft semi open model according to claim 4 faceplate that purifies air is characterized in that, the length of described circular arc opening is slightly larger than the length of wearer's left eye outer rim to the right eye outer rim.
6. the forced draft semi open model according to claim 5 faceplate that purifies air, it is characterized in that, the cover body with shape of face slick and sly arc-shaped curved surface of described face shield for making, this face shield and the described helmet by the high transparent PVC of preventing atomization combine formation to the wearer from forehead down to its chin and covering curtain shape positive pressure purification air-flow drainage channel to two ectocanthion and cheek.
7. the forced draft semi open model according to claim 5 faceplate that purifies air is characterized in that the length of described plenum chamber is 80～125mm, and its cross section sectional area is 256～976mm
2The wind speed of the wind that described blowing mouth blows out is 0.28m/s～0.31m/s, and forms the curtain shape wind band of range greater than 15cm.
8. according to each described forced draft semi open model of claim 1～7 faceplate that purifies air, it is characterized in that described electret air filtering material is electret static synthetic fibers filtering materials.
9. the forced draft semi open model according to claim 1 faceplate that purifies air, it is characterized in that, described air pressure and voltage alarm device comprise pressure capsule system and voltage sensor system, wherein, pressure capsule system comprises be used to detect the pressure sensor of plenum chamber internal gas pressure and the pressure early warning circuit that gives the alarm when the required working resistance of filter is excessive; Described voltage sensor system comprises be used to detect power source voltage and voltage detecting that gives the alarm and early warning circuit when brownout; Described pressure early warning circuit comprises reference power supply, phase inverter, multivibrator and the buzzer that connects successively; Described voltage detecting comprises sample circuit, phase inverter, multivibrator and the buzzer that is connected successively with early warning circuit.
10. the forced draft semi open model according to claim 1 faceplate that purifies air, it is characterized in that, described power supply is that output voltage is the chargeable miniature lithium battery group of 10V, capacity 〉=2700mAh, described blower fan be the air quantity excursion between 13CFM～20CFM and static current of lcd be not more than the low-power consumption blower fan of 280mA.
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| CN201310085122.0A CN103223214B (en) | 2013-03-15 | 2013-03-15 | Semi-open type positive-pressure air supplying and purifying helmet shield |
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| CN201310085122.0A CN103223214B (en) | 2013-03-15 | 2013-03-15 | Semi-open type positive-pressure air supplying and purifying helmet shield |
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