CN2235905Y

CN2235905Y - Dust-collecting blackboard eraser

Info

Publication number: CN2235905Y
Application number: CN 95225177
Authority: CN
Inventors: 王俊成
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-10-27
Filing date: 1995-10-27
Publication date: 1996-09-25
Anticipated expiration: 2005-10-27

Abstract

The utility model relates to a dust-collecting blackboard eraser, comprising a casing and an eraser arranged on the casing. The utility model is characterized in that the casing is designed into the casing whose one side is provided with the space and the other side is opened to be provided with the easer, and the cross-section of the casing is rectangular. The space of the casing is provided with an electrostatic generator, and the electrostatic generator is composed of an electrical inductance tri-level oscillation circuit, a consequent pole booster coil L3, an iron core 13 among the consequent pole booster coil, as well as a diode D and a capacitor C connected in series and in parallel, wherein, both output ends are connected with the electrodes arranged in both sides of the opening point of the casing. The utility model has the advantages of simple structure, convenient operation, low cost, good dust-collecting effect, being convenient for popularization and application, etc.

Description

Dust absorption blackboard eraser

The utility model relates to the school supply and stationery technical field, particularly a kind of dust absorption blackboard eraser.

As everyone knows, blackboard eraser is with a long history as teaching aid, and this class ordinary blackboard eraser is dust from flying in use, has a strong impact on the physical and mental health of Faculty and Students.For this reason, people have developed various dust absorption blackboard erasers.In the rub body of blackboard eraser, be provided with by blower fan as adopting, filter the dust arrester that cloth bag is formed, adsorb dust, purify air, but it also exists noise bigger, and filtration cloth bag hole is very easily blocked by dust and reduces the deficiency of pick-up performance.

The problem that the utility model exists at prior art, design provides a kind of simple in structure, easy to use, and cost is lower, and pick-up performance is good, dust absorption blackboard eraser easy to utilize.

The utility model is achieved by following manner: a kind of dust absorption blackboard eraser, comprise housing and on eraser, it is characterized in that: housing is designed to a side and has the space opposite side we opens and eraser can be installed and the cross section is the housing of rectangle, in the space of housing one side electrostatic generator is set, this electrostatic generator is by inductance of three-point oscillating circuit and time utmost point step-up coil L ₃And therebetween iron core B, with time utmost point step-up coil L ₃Serial connection back and the diode D that connects and capacitor C are formed earlier, and wherein, we is connected two outputs and housing by the electrode of eraser both sides, the place of opening.

Said inductance of three-point oscillating circuit is by resistance R, the coil L of triode J and base stage and inter-collector serial connection ₁And L ₂, and emitter stage and the coil L of triode J ₁And L ₂Between the power supply E and the K switch of serial connection form.

Operation principle of the present utility model and process are: attract the principle of slight small item body according to electrostatic energy, load onto the electrostatic generator that is provided with in electrode and the housing around the housing of blackboard eraser, make the high voltage direct current of feeding attract the dust of kicking up in the process of erasing the board.Detailed process is the moment that power supply E connects, and flows through a Weak current I between the be knot of triode J ₆, will produce electric current I between ce _c, this electric current I _cAt L ₂On just produce negative down induced voltage, this voltage has aggravated I _bGrowth, thereby make I _cIncrease rapidly, enter the saturation conduction state until triode J.After the triode J conducting, I _cNo longer be subjected to I _bControl reaches stationary value, so coil L ₂On induced voltage descend coil L ₁On produce negative positive induced voltage down, I _bReduce, triode J withdraws from saturation state and enters the amplification region like this, like this I _bReduce just can make I _cReduce L thereupon ₂On induced voltage further descend, finally cause triode J to end rapidly, weight said process then forms self-oscillation.Owing to have alternating flux among the iron core B, so at inferior utmost point step-up coil L ₃On induce very high alternating voltage, this alternating voltage is through diode D rectification, we opens on the electrode of eraser both sides, place to be added on housing after the capacitor C filtering, and absorbs the dust that blackboard eraser is wiped.

The utility model is compared with prior art, have simple in structure, easy to use, characteristics such as cost is low, and pick-up performance is good, and is easy to utilize.

Fig. 1 is a stereogram of the present utility model;

Fig. 2 is a front view of the present utility model;

Fig. 3 is a circuit diagram of the present utility model.

Fig. 2 is as Figure of abstract.

Among the figure: 1 eraser, 2 housings, 3 electrodes, 4 electrostatic generators, 5 power supply E, 6 K switch, 7 triode J, 8 resistance R, 9 coil L ₂, 10 coil L ₂, 11 utmost point step-up coil L ₃, 12 diode D, 13 capacitor C, 14 iron core B, 15 outputs.

Most preferred embodiment of the present utility model, as Figure 1-3.A kind of dust absorption blackboard eraser, comprise housing 2 and on eraser 1, it is characterized in that: housing is designed to a side and has the space opposite side we opens and eraser 1 can be installed and the cross section is the housing of rectangle, electrostatic generator 4 is set in the space of housing 2 one sides, and this electrostatic generator 4 is by inductance of three-point oscillating circuit and time utmost point step-up coil L ₃11 and therebetween iron core B14, with time utmost point step-up coil L ₃11 are connected in series back and the diode D12 that connects and capacitor C 13 earlier forms, and wherein, two outputs 15 are connected with housing 2 our electrodes 3 of the place's of opening eraser 1 both sides.

Said inductance of three-point oscillating circuit is by resistance R 8, the coil L of triode J7 and base stage and inter-collector serial connection ₁9 and L ₂10 and emitter stage and the coil L of triode J7 ₁₉And L ₂The power supply E5 of 10 serial connections and K switch 6 are formed.

Claims

1, a kind of dust absorption blackboard eraser, comprise housing and on eraser, it is characterized in that: housing is designed to a side and has the space opposite side we opens and eraser can be installed and the cross section is the housing of rectangle, in the space of housing one side electrostatic generator is set, this electrostatic generator is by inductance of three-point oscillating circuit and time utmost point step-up coil L ₃And therebetween iron core B, with time utmost point step-up coil L ₃Serial connection back and the diode D that connects and capacitor C are formed earlier, and wherein, we is connected two outputs and housing by the electrode of eraser both sides, the place of opening.

2, dust absorption blackboard eraser as claimed in claim 1 is characterized in that: said inductance of three-point oscillating circuit is by resistance R, the coil L of triode J and base stage and inter-collector serial connection ₁And L ₂, and emitter stage and the coil L of triode J ₁And L ₂Between the power supply E and the K switch of serial connection form.