JPS6340094B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a vacuum cleaner, and an object thereof is to provide an energy-saving vacuum cleaner that does not allow input power more than necessary to flow into an electric blower.

In conventional vacuum cleaners, when the floor nozzle is lifted into the air, the air volume is maximized, even though it does not actually suck up dirt, and therefore the power consumption is maximized. There were flaws. Therefore, changes in the air volume and pressure when the floor nozzle is lifted into the air, or the rotational speed of the electric blower are detected, and a power control circuit connected in series with the electric blower is activated to input the electric blower's input. A method of reducing power consumption and saving power has been proposed. However, all of these methods depend on the air volume, pressure, and
In addition, since the rotation speed of the electric blower is used as a standard, when dust accumulates in the dust collection chamber, the air volume, pressure, and rotation speed of the electric blower will change as if the floor nozzle were in the air. In such a case, even if the floor nozzle is lifted into the air, the input power of the electric blower cannot be reduced, and the purpose of power saving cannot be achieved. Nakatsuta.

Therefore, the present invention aims to solve the above-mentioned conventional drawbacks, and embodiments thereof will be described below based on the drawings.

In Figure 1, 1 is the main body case of the vacuum cleaner, 2 is the filter, and behind it is the electric blower 3.
is provided. 4 is a hose, and 5 is a connecting pipe that connects the main body case 1 and the hose 4. hose 4
The air and dust sucked in are separated by a filter 2, and the air is discharged from an exhaust port 6. 7 is an air volume sensor provided in the air flow path.

Figure 2 shows an example of a control circuit, in which an electric blower 3
A power control circuit 8 is connected in series with the power control circuit 8, and the output of the comparator 9 is connected to the input terminal of the power control circuit 8. A memory circuit 10 for storing the maximum or minimum value of the output of the sensor 7 at fixed time intervals is connected to one of the two input terminals of the comparator 9;
The output of the sensor 7 is connected to the other input terminal of the sensor.

In the above configuration, when the output of the sensor 7 becomes the same as the value stored in the storage circuit 10, the comparator 9 outputs an output, and the power control circuit 8 reduces the input power. Further, due to this decrease in input power, the air volume, pressure, rotation speed of the electric blower, etc. fluctuate, so the comparator 9 is provided with hysteresis to prevent the comparator 9 from inverting.

Note that the sensor 7 may be the air volume sensor 7 shown in FIG. 1, or the same can be said of a signal based on pressure or the rotational speed of an electric blower.

As described above, according to the present invention, the maximum or minimum value of the sensor output for each fixed time period is stored, the stored value is compared with the sensor value, and the power control circuit is operated to control the input power. Even if the dust collection chamber is clogged with debris, the air volume, pressure, and
Alternatively, the number of revolutions of the electric blower can be stored in a memory circuit, and the input power can be limited by comparing that value with the sensor value, thereby making it possible to provide a power-saving vacuum cleaner. , the effect is great.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing an embodiment of the vacuum cleaner of the present invention, and FIG. 2 is a control circuit diagram. 3... Electric blower, 7... Sensor, 8... Power control circuit, 9... Comparator, 10... Memory circuit.

Claims (1)

[Claims] 1. A sensor that detects air volume or pressure or the rotation speed of an electric blower, a memory circuit that stores the maximum or minimum value of the output value of this sensor at fixed time intervals, and a memory circuit that stores the value of this memory circuit and the output value of the sensor. A vacuum cleaner comprising a comparator for comparison and a power control circuit controlled by the output of the comparator and connected in series with an electric blower.