KR940009654B1 - Suction speed controller of vacuum cleaner - Google Patents

Abstract

Suction power controller comprises a sensor part (10), an amplifying part (20) and a microcomputer (30). The sensor (10) senses a vibration frequency signal from a power brush (4), and the vibration frequency is amplified by an amplifier (20). The microcomputer senses a power added to the power brush (4), generates a suction power in inverse proportion to the power, and then operates a motor. A constant suction power is maintained, not related to a push-pull suction tube, by controlling contact load between a power brush and a bottom part.

Description

Suction force control device of vacuum cleaner

Figure 1a is a schematic diagram of the electric brush device of the present invention, (b) is a cross-sectional view of the electric brush device.

2 is a configuration of the suction force control of the vacuum cleaner of the present invention.

3 is a detailed configuration diagram of FIG.

4 is a signal flow diagram of the present invention.

5 is an explanatory diagram of the movement of the ferrite core according to the force applied to the brush.

6 is a positional correlation diagram of an oscillation frequency and a ferrite core.

7 is a correlation graph of oscillation frequency and suction power.

* Explanation of symbols for main parts of the drawings

1: suction pipe 2: electric brush device

3: bottom surface 4: electric brush

5: electric brush shaft 6: piston connection

7: spring 8: ferrite core

9: coil 10: pressure sensing unit

20: amplification unit 30: micom

Q1: Transistor C1-C3: Capacitor

R1-R4: Resistance

The present invention relates to a technology for controlling the suction force of the vacuum cleaner, and in particular, when the user pushes or pulls the dust suction tube, in consideration of the change of load according to the contact state of the electric brush and the bottom surface, the vacuum is always suitable to maintain a constant suction force It relates to a suction force control device of the cleaner.

In general, the user repeatedly pushes and pulls the dust suction pipe for cleaning. When the dust suction pipe is pushed, the contact force between the power brush and the bottom surface is relatively good, so the suction power is high, and the dust suction pipe is removed. When pulled, the suction force is low because the contact between the brush and the bottom of the suction pipe is much worse than when it is pushed.

As a result, when the suction pipe is pushed, the cleaner takes a lot of load, but when it is pulled, the load is very small.In this case, when the brush and the floor are in close contact, the connector may be damaged by the user's forcing, Falling away takes a lot of time and stamina, and even more so with a mop cleaner.

The present invention has been invented to maintain an even suction force when the user pushes or pulls by detecting the force pushing and pulling the dust suction pipe in order to solve such a conventional defect, as described in detail by the accompanying drawings as follows. .

Figure 1a is a schematic view of the electric brush apparatus of the present invention, (b) is a cross-sectional view of the electric brush apparatus, as shown in this, the electric brush 4 is pushed forward in contact with the bottom surface (3) As a result, the spring 7 installed at the rear end of one shaft 5 of the electric brush 4 is compressed toward the suction pipe 1 side, and the ferrite core 8 connected to the piston connection 6 enters into the coil 9. When the pushing force of the electric brush 4 is removed, the ferrite core 8 is retracted out of the coil 9 by the restoring force of the spring 7.

2 is a configuration of the suction force control of the vacuum cleaner of the present invention, as shown therein, consisting of the condenser (C1, C2) and the coil (9) oscillation of the frequency corresponding to the force applied to the electric brush (4) An amplifier configured to output a signal, a transistor Q1, a capacitor C3, and a resistor R1-R4 and amplify an oscillation output fed back from the pressure detector 10 ( 20) and the microcomputer 30 which drives the electric motor so that a suction force inversely proportional to the force is generated by judging the force applied to the electric brush 4 by counting the oscillation pulses output to the amplification unit 20. When described in detail with reference to Figures 3 to 6 attached to the operation and effects of the present invention configured as described above are as follows.

When the user pushes the electric brush 4 forward while the electric brush 4 is in contact with the bottom surface 3 for cleaning, the electric brush 4 is pushed toward the suction pipe 1 and the spring 7 and the piston connecting part 6 As shown in FIG. 5, the ferrite core 8 enters the coil 9 through which current flows, thereby changing the magnetic field generated in the coil 9 and changing the magnetic field. Changes the inductance value of the coil 9.

Then, at the moment when the operation of pushing the electric brush 4 is stopped as described above, the ferrite core 8 is moved to its original position by the restoring force of the spring 7, and while the user continues cleaning, By the same action, the inductance value of the coil 9 is changed repeatedly.

Output generated by the oscillation action composed of the condensers C1 and C2 and the coil 9 while the user cleans as described above In addition to being supplied to the microcomputer 30, at this time, since the feedback voltage V _f is supplied to the control terminal (base) of the transistor Q1 through the capacitor C3, the oscillation frequency f _t has a sufficient gain. This oscillation action continues.

As shown in FIGS. 5 and 6, when the user pushes the suction pipe 1 hard, the ferrite core 8 enters the coil 9 and the inductance value of the coil 9 is increased, so that the pressure sensing unit 10 is increased. The oscillation frequency (f _t ) output from the lower becomes low, on the contrary, if the suction pipe (1) is pushed weakly, the ferrite core (8) is not completely entered into the coil (9), the inductance value of the coil (9) is The oscillation frequency f _t is increased by decreasing.

As in FIG. 5, the initial state before the suction tube 1 is pushed forward, that is, the position before the ferrite core 8 enters the coil 9, is located in the linear portion on the displacement and frequency correlation graph of FIG. When fixed to the minimum point position (X _min ) for positioning, the position of the core 8 in the coil 9 will be at the maximum point (X _m ax) until the spring 7 is fully retracted while the user is cleaning. At this time, the oscillation frequency is the end point frequency (f _min ) of the linear portion. In addition, as shown in FIG. 7, the microcomputer 30 counts the number of pulses of the oscillation signal f _t input from the pressure sensing unit 10 for a predetermined time T ₁ , thereby initial setting value P1. If it is determined that a higher frequency is input, the suction force is increased until the initial setpoint P2 is reached.

If it is determined that the oscillation frequency (f _t ) is lower than the maximum value (f _max ), the power brush (4) is in a state of being lifted in the air to cut off the power to prevent unnecessary power consumption.

As described in detail above, the present invention generates a suction force inversely proportional to the force applied to the suction pipe to prevent the user from pushing the suction pipe a little harder, that is, the mop part sticks to the floor and becomes very difficult to clean. It can be, even if pushed lightly provides sufficient suction power can be easily cleaned, there is an advantage that can prevent the damage of parts by the force, and prevent unnecessary waste of power.

Claims (3)

A pressure sensing unit 10 for outputting an oscillation signal having a frequency corresponding to the force applied to the electric brush 4, an amplifying unit 20 for amplifying the oscillation output fed back from the pressure sensing unit 10, and It is characterized in that it consists of a microcomputer (30) for driving the electric motor to generate a suction force inversely proportional to the force to determine the force applied to the electric brush 4 by counting the oscillation pulse output to the amplifier 20 Suction force control device of vacuum cleaner. 2. The pressure sensing unit (10) according to claim 1, wherein the pressure sensing unit (10) is provided on the rear end of one shaft (5) of the electric brush (4) by the electric brush (4) being pushed forward in contact with the bottom surface (3). When the ferrite core 8 connected to the piston connection 6 enters the inside of the coil 9 while the 7 is compressed to the suction pipe 1 side, and the pushing force of the electric brush 4 is removed, the spring ( 7) The suction force control apparatus of the vacuum cleaner, characterized in that the ferrite core (8) by the restoring force to generate the oscillation signal of the frequency according to the change in inductance generated when the coil (9) is retracted out. According to claim 1 or 2, if the oscillation frequency input to the microcomputer 30 is lower than the maximum value (f _max ), it is determined that the electric brush 4 is spaced apart from the floor surface (3) Suction force control device of the vacuum cleaner, characterized in that for blocking.