CN87201337U

CN87201337U - Axial-flow type powder-absobing electric eraser

Info

Publication number: CN87201337U
Application number: CN 87201337
Authority: CN
Inventors: 张传彪
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-01-26
Filing date: 1987-01-26
Publication date: 1987-11-25

Abstract

An axial-flow type powder-absorbing electric eraser of the utility model is mainly applied to classroom teaching, laboratories and teaching and research sections. The axial-flow type powder-absorbing electric eraser has the function of absorbing the powder dust erased by a felt eraser, and adopts the principle of air draft of an axial flow fan. Two air inlet channels are designed and a rubber ring for closing dust is arranged between the center and the circumference of the felt eraser and the casing of the axial-flow type powder-absorbing electric eraser. The powder dust erased by the felt eraser is absorbed by the attracting force by the rotating of a blower fan under the closing function of the rubber ring for closing dust. The mixed gas adulterated in the air is absorbed into the axial-flow type powder-absorbing electric eraser through the two air inlet channels, and thus the effective dust suction is achieved.

Description

Axial-flow type powder-absobing electric eraser

The present invention relates to a kind of teaching specific purpose tool, be specifically designed to and erase the board.

Existing blackboard eraser has two kinds: a kind of is the hairbrush blackboard eraser; A kind of is the felt blackboard eraser.Use these two kinds of blackboard erasers the phenomenon that dust is existed everywhere always to occur.The dust pollution that flies up the space, classroom, it had both endangered the healthy of teacher and classmates, affect indoor environmental hygiene and personal hygiene again, particularly to the high instrument of these precision being played in various degree infringement by the teaching and research room's dust that electronic computer is housed and is furnished with precision instrument.

Task of the present invention mainly provides a kind of dust absorption blackboard eraser, and it can be with in the basic all suctions of the chalk dust under the wiping blackboard eraser.

Task of the present invention is finished as follows: a minisize axial-flow formula blower fan is housed in rub body inside, blower fan is made up of one 1.5～6 volts a DC micromotor and a helical blade, blade circumference place is furnished with a blade shroud, the bottom of blade shroud is that felt is wiped, and blade shroud and felt are wiped and all together be fixed in the rub body with bolt.It is to be posted on the felt seat with 4～8 felt pieces are sticking that felt is wiped, and leaves the wide gap of 4～10mm between every adjacent two felt pieces.Be furnished with an envelope dirt cushion rubber at rub body bottom lower edge, play the effect of envelope dirt, envelope dirt cushion rubber exceeds felt and wipes 3～6mm.In the rub body top by adorning micro machine, battery case, supply socket, switch and both positive and negative polarity contact and conductor part.When inhaling the work of powder blackboard eraser, at first Push switch is connected ring current, at this moment blower fan rotation is under the suction of blower fan, by the dust under the felt wiping, enter in the rub body through two ventilation roads, a part is wiped center hole by the gap between the felt piece through felt and is entered in the rub body; Another part dust then enters in the rub body by the annular circumferential slit that rub body lower edge internal diameter and felt are wiped between the external diameter.Suck the interior mist of rub body under the effect of filter screen, gas flows to the space from air outlet, and dust is then stayed in the rub body.Therefore reach the pollution purpose of staticizing room air.The present invention is easy to use, and pick-up performance is good, and dust-absorbing rate reaches about 97%, with soon drift about to the space less than dust.

Below with reference to embodiment and accompanying drawing thereof the present invention is further described.

Fig. 1 is the longitudinal sectional drawing of a kind of concrete structure of the present invention.

Fig. 2 is a kind of upward view of the present invention.

Fig. 3 is a kind of vertical view of the present invention.

Fig. 4 is a principle of the invention circuit diagram.

With reference to Fig. 1, Fig. 2, Fig. 3, this electronic suction powder blackboard eraser has a rub body made from plastics (32), and rub body (32) is made up of shell (1) and loam cake (19).One switch (14) is housed on the rub body.And use bolt (12) and bolt (28) that shell (1) and loam cake (19) are linked together respectively.On the median vertical line in the rub body (32) a gentle breeze machine is housed.With top one 3 volts micro machines (22) are housed at section (30), battery case (25), battery (20), socket (21), positive wire contact (18), cathode conductor contact (27), anode lead (17), GND lead (26), socket positive wire (15), socket cathode conductor (23).Micro machine (22) is fixed by bolts to the center of the section (30) of shell (1).Battery case (25) is fixed on the shell (1) with bolt (24).Anode lead (17), an end is connected with positive wire contact (18), and the other end is connected with the top connection of switch (14).GND lead (26) one ends are connected with cathode conductor contact (27), the other end is connected with the negative pole tap of micro machine (22), socket (21) is fixed on the upper side of shell (1), its positive pole is connected by the top connection of positive wire (15) with switch (14), and negative pole is connected by the negative pole tap of cathode conductor (23) with micro machine (22).Lead (16) one ends are connected with the lower contact of switch (14), and the other end is connected with the anodal tap of micro machine (22), and socket (21) is used to connect the plug of rectifier.Below the section (30) blade (7), blade (7) welds together with scolding tin with the axle of micro machine (22), the circumference of blade (7) is provided with a blade shroud (8) outward, and the inner space part of blade shroud (8) constitutes air compartment (5), and its space outerpace partly constitutes dust-storage chamber (11).Air compartment (5) plays guide effect to the mist that sucks in the rub body.Dust-storage chamber (11) plays the storage effect to the dust that sucks in the rub body.It is to be posted on the felt seat (4) with uniform the gluing of 502 glue with six felt pieces (3) that area equates that felt is wiped (33), and adjacent two felt pieces leave the wide slit of 5mm (31).The circular hole (6) that to leave a diameter at the center that felt is wiped (33) be φ 25mm, the circumference that felt is wiped (33) is outward an air inlet duct (2), both communicate circular hole (6) and air inlet duct (2) with air compartment (5) respectively.Felt is wiped (33) and blade shroud (8) is fixed on the shell (1) together with bolt (10).The lower end of shell (1) is furnished with an envelope dirt cushion rubber (9), it and blackboard plane are in angle of 45 degrees, and be higher than felt piece (3) 5mm, envelope dirt cushion rubber (9) mainly plays a part the sealing dust, dust under it will be wiped by felt is shut in the female surface of cushion rubber, and the inner edge of exhaust vent (34) is stained with filter screen (13) with 502 glue, and it plays sucking the filtration of the mist in the rub body.

When work, at first turn on the power switch (14), at this moment circuit is connected, the blower fan rotation, by the dust under felt wiping (33) wiping, a part flows in the air compartment (5) by air inlet duct (2), another part is that slit (31) and the circular hole (6) of 5mm enters air compartment (5) through width between the felt piece then, enter the interior mist of air compartment under the effect of filter screen (13), gas passes through filter screen and inflow space, and then dust is stayed in the dust-storage chamber (11).When getting dust, take off getting dirt bolt (29), Push switch (14) can blow out dust again.

When working with reference to Fig. 4, Push switch (14).Connect ring current, the negative pole that electric current is got back to battery (20) from battery (20) through lead (17), switch (14) lead (16), motor (22), lead (26) constitutes the closed-loop path, the blower fan rotation, when stopping, Push switch (14), the cut-off loop power supply, blower fan quits work.

Claims

1, blackboard eraser of being made up of rub body [32] and felt wiping [33] is characterized in that:

A, rub body are equipped with a dc fan in [32],

It is to be made of 4 to 8 felt pieces [3] and felt seat [4] that b, felt are wiped [33],

C, be equipped with in the lower end of shell [1] one with blackboard plane envelope dirt cushion rubber [9] in angle of 45 degrees.

2, according to claim 1 described blackboard eraser, it is characterized in that said dc fan is made up of 3 to 6 volts micro machine (22) and blade (7), the space at blade (7) place constitutes air compartment (5), and air compartment (5) space in addition constitutes dust-storage chamber (11).

3, according to the described blackboard eraser of claim 1, it is characterized in that said felt wipes the centre of (33) and leave a circular hole (6), every adjacent two of felt piece (3) are left 4 to 10mm wide gaps (31) and communicate with the center hole (6) of felt wiping (33).

4,, it is characterized in that said envelope dirt cushion rubber (9) and blackboard plane in angle of 45 degrees, and exceed felt piece (3) 3 to 6mm according to the described blackboard eraser of claim 1.