CN201172347Y - Dust absorbing device for blackboard - Google Patents

Abstract

A blackboard dust suction device which can remove chalk dust is composed of a body, an electric blower fan, a filter, a filter casing, an end cover, a connecting hose and a blackboard eraser. When working, the electric blower fan rotates in high speed to generate negative pressure, the negative pressure sucks in and filters the chalk dust generated when cleaning a blackboard via the blackboard eraser, the hose and the filter, and finally cleaned air is discharged.

Description

The blackboard dust exhaust apparatus

Affiliated technical field

The utility model relates to a kind of device of absorbing blackboard chalk dust mark, is a kind of teaching aid.

Background technology

Chalk and blackboard have obtained using widely in teaching, make the utilization rate of chalk and blackboard reduce though have now in a lot of advanced persons' the educational technology equipment input teaching, chalk and blackboard are to understanding the most intuitively of bringing of student and the cheap chalk and the blackboard of having determined of distinctive calligraphy structure of body word and the price of blackboard chalk own is difficult to withdraw from teaching field.But it is exactly can produce a large amount of dust when brushing person's handwriting that chalk has a very harmful side effect, directly endangers teachers and students' health.

Just there is the people to eliminate the blackboard dust by every means a long time ago, also proposed many practical approaches, in the middle of patent application the earliest, can both find the trace of these designs.But up to now, dropped into the dust suction scrubbing brush of producing on the market and substantially just divided two big classes: a class is the hand-held scrubbing brush.The fatal shortcoming of this class scrubbing brush is exactly that power little (some still is a passive delivery), filter dirt are simple, and direct result is exactly both cannot not inhaled intactly dust, and that the dust of inspiration is also filtered is unclean, and practical value is little.Another kind of is exactly special negative pressure generation device and filter, and they separate with scrubbing brush, between connect with flexible pipe.Also just be quite analogous to domestic vacuum cleaners.Very big shortcoming of this class device is exactly that dust suction and filter dirt part are substantially all directly indiscriminately imitated domestic vacuum cleaners, and sucking chalk powder does not need the so big power of domestic vacuum cleaners, and chalk dust its ash footpath with respect to the dust in general place distributes very extensive, concentration is very high, and its effect is also undesirable.So really long-term, effective, cheap ground filtering dust, present existing blackboard dust exhaust apparatus is difficult to reach requirement.

Summary of the invention

Can not effectively eliminate the disease of covering of chalk dust in order to overcome existing blackboard brush, the utility model provides a kind of dust exhaust apparatus, and the dust that it produces in the time of absorbing the brushing chalk writing is done the best the environment of a health is provided for numerous teachers and students.

The utility model is achieved in that it is similar to domestic vacuum cleaners, but its power section is after a large amount of experiments and the motor that selected power is fit to, scrubbing brush is what to separate with dust suction, dust filtration device, dust suction filter dirt part is installed on the body of wall of below, blackboard middle with bolt, connects dust filtration device and hollow blackboard brush with a flexible pipe.The negative pressure that dust exhaust apparatus produces passes to blackboard brush through dust filtration device, flexible pipe, produces negative pressure around blackboard brush, and the chalk dust mark that produces when brushing blackboard just is sucked into dust filtration device, discharges clean air after filtering the powder mark.

Characteristics of the present utility model are exactly dust filtration device, it is not that a sort of single dust filtration device in the past designing comes the leaching mark, but all bear certain filter dirt task by each part in this integral body, the final clean air of discharging, it is achieved in that the common bellows that hose adopts concavo-convex annular groove, rather than the flexible pipe of inner wall smooth.Dust filtration device adopt large diameter cylinder type hollow metal combined type filter (as the diesel engine air filter), cleaner adopts abundant cloth near the end socket of that end of air inlet.The chalk dust that the classroom produces is a lot, and all have more than is needed how long Chalk-dust filtering normally just of general dust filtration device because filtration channel has blocked up completely dust, can't normally use.Because dust is many, so cleaner often must get and clean, and the filter of domestic type is unable to undergo the repeated multiple times cleaning, so the utility model adopts metal composite formula filter core, it can repeated multiple times clean, and metal composite formula filter core inside has very big space can bear the task of heavier absorption dust.But the filter dirt effect of independent metal composite formula filter core is very poor, and it filters unclean dust substantially.The utility model is when cleaning filter core, flexible pipe and end socket cloth is together got wet soak, and like this, when the very high air communication of dust concentration is crossed flexible pipe, can collide because of the tube wall with humidity and is adsorbed with regard to having greatly dust, rests in the annular groove.When air-flow flows out pipeline when entering cleaner, because action of inertia, dust will at first bump against with filter core end socket cloth, this again can some dust can be adsorbed by wet cloth.Afterwards, air-flow scatters around filter core and discharges by filter core, motor, because be cylindrical filter core, so in identical big or small space, the flow area of this filter core is maximum, and the diameter of filter core is also bigger, so air-flow its flow velocity when entering filter core can reduce greatly, and the dust of this moment seldom and kinetic energy very little, easily will be adsorbed by filter core fully, final air of discharging cleaning.

Description of drawings

The utility model is described in further detail below in conjunction with Figure of description.

Fig. 1 is a structure chart of the present utility model.

1. bodies among the figure, 2. electric fan, 3. filter case, 4. metal brings back to life the formula filter core, 5. shutoff .6, end cap .7, hose .8, blackboard brush.

The specific embodiment

In Fig. 1, body (1) is cylindrical, has two support foots to be installed on the metope with bolt above it, and motor (2) is installed in the body (1).Cylindrical filter case (3) is plugged on the body (1), cylindrical metal brings back to life formula filter core (4) and is placed in the housing (3), one end of filter core (4) covers with shutoff (5) and seals. and end cap (6) is installed on the filter case (3), a protruding handle of cylindrical hollow is arranged on the end cap (6), hose (7) one ends are associated on the protruding handle of end cap (6), and an end connects with blackboard brush (8).

It is that 220 volts low-power exchanges series excited machine that motor (2) is selected rated voltage for use, though this motor noise more greatly, can directly use city's power supply, and use cost is low.Filter case (3) is made up of the different hollow cylinder of two sections diameter, has emptying aperture to communicate between two sections.Filter case (3) connects rather than screw thread or bayonet socket by the mode of pegging graft with body (1), because housing can often be taken off cleaning, and bayonet socket or thread connection concerning pass student particularly the pupil installation and demolition all not quite convenient, can meet the demands fully and cooperate tight slightly socket to connect.Metal composite formula filter core (4) is placed in the housing (3), seals port with shutoff (5) above, and shutoff (5) can be made with a common thick cloth.End cap (6) covers on housing (3), form a sealed space with housing (3), because when work, be negative pressure in the housing (3), so end cap (6) is pressed on the housing (3) tightly by atmosphere, need only the ora terminalis of housing (3) do level and smooth seal especially with regard to guaranteeing sealing, can certainly be stained with one deck soft material in end cap (6) inner surface outer ring and guarantee sealing, also adopt grafting to connect for easy to use between end cap (6) and the housing (3).One end of hose (7) is enclosed within on the protruding handle of end cap (6), and the other end is enclosed within on the handle of blackboard brush (8), can dismantle easily.Oversize flexible pipe can cause the inconvenience of use, also can cause inspiratory resistance to increase, so body (1) is installed under the blackboard on the wall, so just can brush time blackboard with the shortest flexible pipe.Blackboard brush (8) is that inside has the hollow scrubbing brush of gas channel around leading to, and it can do circular or rectangle, can also do that a speciality hollow handle one end links to each other with flexible pipe with scrubbing brush, an end so that the shorter student's use of height.

During use, after motor was connected power supply, the negative pressure that the fan blade rotation produces sucked the air around the scrubbing brush through blackboard brush, flexible pipe, filter core, discharge through motor again.The powder mark that produces during erasing blackboard also just is inhaled into air-flow, and is considered the filter of dirt device only.A bolt is respectively ordered in the appropriate location on two headwalls of blackboard, and scrubbing brush just can hang on the bolt so that use with the back.The break-make of motor power can directly be controlled with the veneer switch of installing on the wall, also can control with the key switch on the body.

Every use a period of time all can be taken off flexible pipe, filter core and shutoff cloth by the student on duty, and water is rinsed well then, slightly moisture is dried and just can reinstall, and reuses.

The utility model is manually made a model and is used after three months proving effect good in school, and it is convenient to clean.Suck under the prerequisite of dust in assurance, power of motor is little, economize on electricity.Noise is also less, does not hinder normal speech.When unique inconvenience is exactly erasing blackboard, sway about the flexible pipe meeting of having dragged behind the scrubbing brush, cause singlehanded use inconvenience, just can deal with problems well but only need to hold flexible pipe with another, all finished by the student in following class hour and brush the powder mark in a large number, this point is not difficult to accomplish.

Claims (1)

1, a kind of installation blackboard dust exhaust apparatus on the wall, electric fan, dust filtration device, hose are installed on body, and the other end of hose is connected to the hollow blackboard brush, it is characterized in that: its filter core is a metal composite formula hollow circular cylinder filter core that can repeatedly clean.

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