CN2209053Y

CN2209053Y - Healthy blackboard eraser

Info

Publication number: CN2209053Y
Application number: CN 94231041
Authority: CN
Inventors: 李晓钧
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-12-09
Filing date: 1994-12-09
Publication date: 1995-10-04
Anticipated expiration: 2004-12-09

Abstract

The utility model discloses a blackboard eraser which can eliminate flying dust when the blackboard eraser is used for erasing a blackboard. The blackboard brush realizes dust removal through the special structure and the artful arrangement of a dust collecting cover, a casing, brush bristles, a brush bristle seat, a dust absorbing channel, a dust removing part, a motor-blower when the dust removing part forms instantaneous vacuum. The utility model has the advantages of simple and compact structure and high efficiency, and is a novel blackboard eraser which is suitable for educational systems to use.

Description

Healthy blackboard eraser

The utility model belongs to the educational system articles for use, relates to a kind of blackboard brush of being made up of bristle, hair brush base.

Traditional blackboard brush is exactly this structure, and it only can wipe the chalk dust on the blackboard.But can not eliminate flying upward, filling the air of dust.So both damage teacher, student's health, polluted environment again.

The purpose of this utility model just provides a kind of blackboard brush of eliminating dust from flying when cleaning off a blackboard.

The utility model purpose is achieved in that traditional blackboard brush is when wiping ash, dust outwards flies upward from bristle and blackboard contact-making surface edge, according to this characteristic, establish air suction opening in the hair brush base levels of traditional blackboard brush, one side then that it is without bristles is movably arranged on the dust exhaust apparatus.This dust exhaust apparatus is made up of housing, dust gathering arrester, dust-absorbing flue, dedusting portion, dust-collecting type motor-blower fan.Wherein, dust gathering arrester is an annular, and hoop covers bristle on housing top, thereby prevents that dust from escaping.Each sidewall height of this dust gathering arrester bottom when wiping ash all can contact blackboard with bristle and be advisable.Dedusting portion adopts known cyclone type dedusting portion, is convenient to capture dust and storage ash.Blast pipe is established on its top, the bottom sealing of falling the hawk.The blast pipe horizontal tangential is connected in the dedusting portion.Dedusting portion, dust-absorbing flue, motor-blower fan are assembled in the housing.Housing sidewall is established the inlet scoop.Dust-absorbing flue is the attaching parts of air suction opening and blast pipe.The inlet scoop and the blast pipe of motor-blower fan join.During work, make the blower fan inlet scoop towards ground.Connect power supply, draught fan impeller is under the high-speed driving of motor, and the blade in the impeller constantly to the air acting, makes the air in the impeller obtain energy, and to discharge blower fan at a high speed.Simultaneously, the air in the blower fan front end dedusting portion removes to replenish the air in the impeller continuously, causes dedusting portion to form instantaneous vacuum, promptly forms a Negative Pressure Difference with external atmosphere pressure in dedusting portion.Because the dust that bristle has been wiped is subjected to the dust gathering arrester restriction, can not escape.Thereby under this suction function, the dust that suction port is nearby kicked up all at a high speed enters dedusting portion along blast pipe with tangential direction with air-flow, obtains to rotatablely move.And the air-flow that is continued to enter extruding downwards, makes spiral motion.Like this, the centrifugal force that causes because of rotation has captured dust.Air-flow then forms one rising eddy flow and overflows through blast pipe, the air port of loosing.After cleaning off a blackboard, cut off the electricity supply, open down hawk, dust can be outwelled.

Certainly also can adopt the form that before motor-blower fan inlet scoop, installs filter mesh layer additional, and consider from its effect, also can establish again one utilize cam driven make bar and vibrate filter mesh layer fall the ash mechanism, so according to above-mentioned, dedusting portion can not be the cyclone type structure just, can be other random geometry.Blast pipe also needn't be horizontal tangential with dedusting portion and connect, and perhaps directly establishes air inlet in dedusting portion, and dust-absorbing flue joins with it.During work, dust-contained airflow enters dedusting portion through air suction opening, dust-absorbing flue, air inlet, filters through filter mesh layer, and clean air enters indoor again through blast pipe, the air port of loosing, and dust then is trapped in the dedusting portion.

Above-mentioned dust-collecting type motor-blower fan, the motor-blower fan of the medium and small dust catcher use of promptly selling in the market, it generally is made up of fan housing, impeller, guide wheel, bearing cap, motor, casing etc.Blower fan is a scroll casing type, and impeller is the backward type design.Better with the selection dry cell in the application of the utility model blackboard brush as the micromachine of power supply.Example: permanent magnetism series excitation type 782 type dc motors.Also can adopt blow-up direct current series motor or other motor as required.But motor speed requires to be not less than 6000 rev/mins.If motor-fan noise surpasses the national regulation limit value, must be provided with quieter material this moment at the motor casing inwall; Sound-absorbing material (noise reduction and sound-absorbing material are generally selected porous fiber shape polyurethane foam plastics, mineral wool etc. for use) is set in the motor outer ring.

Above-mentioned dust gathering arrester can be made with rubber or thin plastics.Parts such as housing, dust-absorbing flue, dedusting portion can adopt the engineering plastics manufacturing.

Owing to adopted dust exhaust apparatus in the above-mentioned solution, can eliminate flying upward of dust effectively.It is simple in structure, compact.It is convenient that bristle, hair brush base, dust gathering arrester are changed.If adopt the engineering plastics manufacturing, in light weight, cost is lower, is easy to make.

Below in conjunction with drawings and Examples the utility model is described in further detail.

Fig. 1 is the part assembling drawing that the utility model protects strong blackboard brush.

Fig. 2 is the side view that the utility model protects strong blackboard brush.

Fig. 3 is the vertical view that the utility model protects strong blackboard brush.

Fig. 4 is the cutaway view along the A-A line among Fig. 3.

As seen from Figure 1, Figure 2, the utility model is made up of dust gathering arrester 1, housing 2, bristle 3, hair brush base 4, dust-absorbing flue 5, dedusting portion 6, motor-blower fan 7.Dust gathering arrester 1 is an annular.Each sidewall tranverse sectional thickness successively decreases to the bottom gradually from the top, is an outer font of casting aside.This dust gathering arrester 1 hoop is on housing 2, and housing 2 each lateral wall are established the limited block 10 of an above vertical parallel, in order to clamp the inner edge of the thick end of dust gathering arrester 1 each sidewall cross section.During work, contact with blackboard by the thin end of the cross section of dust gathering arrester 1 each sidewall, thereby dust gathering arrester 1 is unlikely the sidewall curls inward with the displacement of brush.Bristle 3, hair brush base 4 by dust gathering arrester 1 around.Bristle 3 directly embeds hair brush base, the locating slot that hair brush base 4 inserts on housing 2 inwalls.Around the bristle 3, promptly the periphery of hair brush base 4 levels and locating slot levels are established the corresponding four ribbon air suction openings 9 in position.For better dedusting condition is provided, baffled 8 on hair brush base 4, in order to stop bristle 3 bottom edge extensions, this baffle plate 8 is a tubulose, joins with the periphery of the air suction opening of hair brush base 4 levels.Dust-absorbing flue 5, dedusting portion 6, motor-blower fan 7 are assembled in the housing 2.Dust-absorbing flue 5 is four tubaeform long tubes.Each long tube constitutes an integral body by contiguous block 12.Be connected by dust-absorbing flue 5 between the bottom air suction opening 9 of locating slot on blast pipe 13 and the housing 2.Dedusting portion 6 is a diffusion type cyclone dust removal portion, and cylindrical portions may is horizontal involute and connects in blast pipe 13 and this dedusting portion 6, connects inverted cone under this cylinder.Connect ash bucket 14 under the inverted cone.It is the retaining ash-pan that the radiation shield of falling infundibulate 20(title radiation shield meaning in specification and claims afterwards thereof also is housed in the inverted cone bottom).Establish blast pipe 19 in this cylinder, it is cone formula spread support 21 that blast pipe 19 stretches out above-mentioned cylindrical portions may.This spread support 21 joins with the holder 23 of housing 2 madial walls.Motor-blower fan 7 is installed on the holder 23, and is equipped with Shockproof rubber circle 22 before the motor rear fan by fastening cover 24, spot welding one projection behind the motor casing, and this projection falls in the groove of holder 23, increases the stability of motor-blower fan 7.Be provided with the air port 11 of loosing at housing 2 one ends near fan outlet.The bottom of ash bucket 14 adheres to slotted rubber gasket 15, compresses sealing by falling hawk 16.Fall hawk 16 by lateral pin 17 intert be installed in housing 2 hollow out end.Open and close by set clamp 18 controls on housing 2 shells.

Present embodiment has adopted the DC series excitation motor.Battery case 25 is used to deposit dry cell.Plate 27 is convenient to the dismounting of battery, motor-blower fan.Power switch 26 is some contact-making switches, is loaded on housing 2 outsides.Fingerstall 28 tilting housing 2 outsides of being fixed in, size can put in forefinger is advisable, and being used to prevents to accidentally drop breaks and protects strong blackboard brush.

As shown in Figure 3, Figure 4, housing 2, dust-absorbing flue 5, dedusting portion 6, holder 23 adopt the engineering plastics cast in aggregates.During work, make the blower fan inlet scoop towards ground (shown in Fig. 3 arrow).The Motor Drive draught fan impeller rotates at a high speed, and dust laden air enters dust-absorbing flue 5 by air suction opening 9, enters 6 formation of dedusting portion along the involute direction and rotatablely moves, and the air-flow extruding rotation that is continued to enter flows downward.Dust gets rid of under action of centrifugal force to wall and continues downwards with the rotation main flow, when reaching the cone bottom, because the reflex of radiation shield 20, most of swirling eddy reflection is discharged through central row tracheae 19, a small amount of swirling eddy is upwards discharged along inverted cone lower edge and radiation shield 20 centre bores in company with near the dense dust that gathers wall, eddy flow rises in forming, and discharges through blast pipe 19.

Because of dedusting portion 6 has adopted inverted cone and radiation shield 20, the dust that has separated is fallen along the circumferential weld between radiation shield 20 and inverted cone, radiation shield 19 tops, be that dedusting portion 6 bottom center portions then do not have the dust accumulation, purifying gas flow is risen when returning dedusting portion 6 middle parts, hardly carry over.Thereby, prolonged motor service life.

The utility model is not subjected to that the embodiment that paints limits among the figure, all can change in a lot of places.Housing 2 is not to be equipped with hair brush base 4, and it also can be other baffled 8 at the air suction opening 9 of locating slot bottom, and bristle 3 directly is contained in the upper surface of housing 2.

Dust-absorbing flue 5 is four tubaeform long tubes not necessarily, also can be one from blast pipe 13 upwardly extending circular cowlings.With 9 covers of the air suction opening on the locating slot of housing 2 within it.In addition, dedusting portion 6 is diffusion type not necessarily, also can be other similar cyclone dust removal portion.

Claims

1, a kind of strong blackboard brush of protecting of bristle and hair brush base that comprises, it is characterized in that: the outside of bristle (3) is provided with dust gathering arrester (1), this dust gathering arrester (1) with bristle (3) around wherein, when wiping ash, can prevent that dust from escaping, bristle (3) embeds in the hair brush base (4), establish air suction opening (9) on the described hair brush base (4), hair brush base (4) is installed on the housing (2), dedusting portion (6) is established in this housing (2) inside, in order to capture, the storage dust, establish blast pipe (13) in the described dedusting portion (6), dust-absorbing flue (5) places between air suction opening (9) and the blast pipe (13), these dedusting portion (6) one ends are mounted with motor-blower fan (7), and the other end is by falling hawk (16) sealing, and the air port (11) of loosing is located on the housing (2).

2, a kind of blackboard brush as claimed in claim 1, it is characterized in that establishing locating slot on the described housing (2), in order to settle hair brush base (4), described hair brush base (4) is provided with baffle plate (8), in order to prevent bristle (3) bottom margin extension, the periphery of hair brush base (4) levels is established the corresponding air suction opening in position (9).

3, a kind of blackboard brush as claimed in claim 2 is characterized in that described baffle plate (8) is a tubulose, joins with the air suction opening (9) of hair brush base (4) levels.

4, a kind of blackboard brush as claimed in claim 2 is characterized in that establishing on the described locating slot air suction opening (9).

5, a kind of blackboard brush as claimed in claim 1 is characterized in that described dust gathering arrester (1) is an annular, is installed on the housing (2), and with bristle (3) cover within it, its sidewall tranverse sectional thickness from one end to the other side successively decreases fully.

6, a kind of as claim 1 or 5 described blackboard brush, it is characterized in that described housing (2) lateral wall establishes one with upper limit position block (10), in order to clamp the inner edge of dust gathering arrester (1).

7, a kind of as claim 1 or 4 described blackboard brush, it is characterized in that an end of described dust-absorbing flue (5) and blast pipe (13) join, the other end and housing (2) are gone up locating slot and are joined, and the air suction opening on the locating slot (9) is comprised wherein.

8, a kind of as claim 1 or 7 described blackboard brush, it is characterized in that described dust-absorbing flue (5) is the tubaeform long tube more than, connect by contiguous block (12) between each long tube.

9, a kind of blackboard brush as claimed in claim 1, it is characterized in that described dedusting portion (6) adopts cyclone type dedusting portion, establish blast pipe (19) in this dedusting portion (6), the part that blast pipe (19) stretches out dedusting portion (6) is spread support (21), motor-blower fan (7) joins with spread support (21), the bottom of dedusting portion (6) and fall and to establish sealing gasket (15) between the hawk (16), the hawk (16) that falls is installed on the housing (2).

10, a kind of blackboard brush as claimed in claim 1 is characterized in that described housing (2) outside is provided with fingerstall (28), is used for inserting finger.