JPS6314612B2 - - Google Patents

Description

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

Conventionally, when the filter of a vacuum cleaner becomes clogged and the air volume decreases, a method of increasing the input power of the electric blower to compensate for this decrease is to install a thyristor 101 in series with the electric blower 100, as shown in FIG. There has been an attempt to change the input power of the electric blower 100 by connecting the electric blower to the electric blower and changing the gate current using a variable resistor 102 linked to a wind receiving plate (not shown). In such a configuration, the input power of the electric blower 100 is determined by the resistance value of the variable resistor 102 (and therefore the position of the wind receiving plate). At this time, the position of the wind receiving plate changes, the resistance value decreases, and the input power of the thyristor 101 increases. However, since there is a one-to-one correspondence between the position of the wind plate and the air volume, even if the position of the wind plate changes due to a decrease in the air volume, and the input increases and the air volume increases, the position of the wind plate will change from the original position. On the contrary, the return input power decreases. Therefore, with this method, the air volume cannot be set completely, and is only effective in compensating to some extent for the reduction in air volume due to filter clogging.

The present invention aims to solve the above problems,
Examples thereof will be described below based on the drawings. In Figure 2, 1 is the case of the vacuum cleaner body, 2
is a filter, and an electric blower 3 is provided behind it. 4 is a hose, and 5 is a connecting pipe that connects the case 1 and the hose 4. Air and dust sucked through a hose 4 are separated by a filter 2, and the air is discharged from an exhaust port 6. 7 is an air volume sensor provided between the front of the electric blower 3 and the filter 2. This function is as shown in Fig. 3.
The signal is input to the control circuit 8, and the electric blower 3 is operated by its output. The configuration of the control circuit 8 is as shown in FIG. 4, in which the output of the sensor 7 is used in a comparison circuit 9 to determine whether the air volume is large or small relative to a set value or is appropriate. When the output of the comparison circuit 9 is larger or smaller than the set value, the value in the storage circuit 10 is increased or decreased. Do not change when appropriate. And this memory circuit 10
The input power control circuit 11 determines the input to the electric blower 3 based on the value of .

In the above configuration, the input power of the electric blower 3 is determined by the value of the memory circuit 10, so when the air volume is larger or smaller than the set value, the comparison circuit 9 determines the output of the sensor and outputs the Memory circuit 10
Increase or decrease the value of. Therefore, since the value in the memory circuit 10 changes, the output of the input power control circuit 11 increases or decreases. As a result, the input power of the electric blower 3 increases or decreases. When the air volume reaches the set value, the output of the comparison circuit 9 that compares and determines the output of the sensor 7 indicates that it is an appropriate value, and the value of the memory circuit 11 is increased.
Therefore, the input power of the electric blower 3 is maintained at the input power at that time.

As described above, according to the present invention, the output of the airflow sensor 7 is judged by the comparison circuit 9, and when the airflow is larger or smaller than the set value, the value in the memory circuit 10 is increased or decreased, and the input is performed based on that value. The power control circuit 11 determines the input power of the electric blower 3, and when the air volume is equal to the set value, the value in the memory circuit 10 is maintained as it is, so that when the air volume decreases due to filter clogging, etc. The suction force can be maintained by increasing the input power of the electric blower 3. In addition, if the floor nozzle is far from the floor and the air volume is too large, it will work to lower the input, and if it is attached to the floor and the air volume decreases, it will work to increase it to the set value, so you can avoid wasting power. It is very economical.

FIG. 5 shows the relationship between the air volume and vacuum degree of a vacuum cleaner having such a circuit configuration. In FIG. 5, reference numeral 12 indicates the relationship between air volume and degree of vacuum in the conventional case, and 13 in the case of the present invention. As described above, in the case of the present invention, the air volume does not exceed a certain level, making it very economical.

FIG. 6 shows an embodiment of the sensor, which has an electrode plate 15 connected to a wind receiving plate pulled by a spring 14 provided in front of the electric blower 3. When the air volume is large, the electric blower 3 It rotates toward , contacts the electrode 16, and outputs a signal indicating a large air volume. On the other hand, when the air volume is low, it contacts the electrode 17 and outputs a signal indicating that the air volume is small. While this signal is being output, the value in the memory circuit 10 continues to increase or decrease, and therefore the electric blower 3
The input power continues to increase or decrease during that time.
When the air volume reaches the set value, the electrode 15 is in the position shown in Fig. 6 and does not come into contact with any of the electrodes 16 and 17, the value in the memory circuit 10 stops increasing and decreasing, and the input power of the electric blower 3 remains at that time. maintained at the value.

By providing the electrode plate 15 and the electrodes 16 and 17 connected to the wind receiving plate in this way, a sensor with a simple and stable structure can be manufactured.

Further, as another embodiment of the sensor, the same effect can be obtained by providing a magnet connected to the wind receiving plate and a reed switch close to the moving position of the magnet. In this case, since the switch part is sealed, there is no problem with the contact part and it operates stably even in an atmosphere with a lot of dust.

It goes without saying that the same effect can be obtained by using a variable resistor in which a slider and a wind receiving plate are connected, or a variable inductance, a variable capacitor, etc., which have been conventionally proposed as a sensor.

In FIG. 7, a capacitor 18 is used as a memory circuit. In this case, for example, if the electrode plate 15 and electrodes 16 and 17 are used as a sensor, when the air volume is large, the electrode plate 15 and the electrode 16 come into contact with each other, and the capacitor 18 The electric charge is discharged through the resistor 19, and the voltage of the capacitor 18 decreases, so that the set input value of the input power control circuit 11, which determines the input power of the electric blower 3 based on the voltage of the capacitor 18, becomes lower. Then, when the air volume decreases and reaches the set value, the electrode plate 15 does not come into contact with either electrode 16, 17, so the voltage value of the capacitor 18 is maintained at a constant value, so the input to the electric blower 3 remains constant. maintained. Therefore, the air volume remains constant. Conversely, when the air volume decreases, the electrode plate 15 comes into contact with the electrode 17, and the capacitor 18 is charged by the power source through the resistor 21. Then, since the voltage of the capacitor 18 increases, the input power to the electric blower 3 increases, and the air volume also increases. In this way, by using the capacitor 18 as the memory circuit 10 and determining the input power to the electric blower 3 based on the charging voltage of the capacitor 18, it is possible to create a stable memory circuit with a very simple configuration and at low cost.

It goes without saying that a digital counter circuit or the like may also be used as the memory circuit.

Further, as shown in FIG. 8, a power source 23 whose voltage is divided by a variable resistor 22 having a wind receiving plate connected to a slider.
It is also conceivable to connect the output 24 of 24 to an amplifier 26 that compares and amplifies the reference voltage 25, and connect this output to the capacitor 18 via the charging control circuit 27. The charging control circuit 27 changes the current for charging and discharging the capacitor 18 according to the output of the amplifier 26. If the air volume is significantly different from the set value, the air volume is increased quickly by charging and discharging the capacitor 18 quickly. Can be set value. Needless to say, this is not limited to the case where the capacitor 18 is used as a memory circuit. Easy-to-use control can be achieved by changing the speed at which the value in the memory circuit increases or decreases depending on the magnitude of the difference between the output of the airflow sensor and the reference value.

As another example, the speed at which the air volume is decreased when the air volume is large is slowed down, and the speed at which the air volume is increased when the air volume is small is increased, thereby moving the floor nozzle away from the floor and bringing it back onto the floor. To provide an easy-to-use vacuum cleaner that can maintain that state for a short period of time, and can quickly increase the air volume when it is placed on the floor after being kept off the floor for a while.

Further, as shown in FIG. 9, the output of the memory circuit 10 or the output of the input power control circuit 11 may be connected to the display 28. The displayed value at this time indicates the set value of the input power of the electric blower 3. If this value is larger, that is, the larger the setting input is, the pressure loss of the filter is increasing, and it is possible to indicate that the filter is clogged with dirt.

In the embodiment shown in Fig. 2, the sensor is positioned after the filter and before the blower, but it does not have to be in this particular position, and the same effect can be obtained at any position within the air flow path within the vacuum cleaner. It goes without saying that it can be done.

As described above, according to the present invention, the comparison circuit detects whether the output of the airflow sensor installed in the air flow path of the vacuum cleaner is large, small, or appropriate for the set value, and when the output is large or small, the memory circuit is By increasing or decreasing the value and setting the electric blower's input power according to the value in the memory circuit, it is possible to always control the air volume to a constant level, and even when the filter becomes clogged with dust, the cleaning ability is reduced. This has great effects, such as being able to clean the floor without having to worry about it, and since the air volume is constant when the floor nozzle is away from the floor, there is no wasted power consumption.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a conventional example, FIG. 2 is a schematic configuration diagram of a vacuum cleaner showing an embodiment of the present invention, and FIGS. 3 and 4 are block diagrams of a control circuit showing an embodiment of the present invention.
Figure 5 is a characteristic diagram, Figure 6 is an explanatory diagram showing an example of the airflow sensor, Figure 7 is a circuit diagram when a capacitor is used in the memory circuit, and Figure 8 is a case where the value of the comparison circuit is amplified. The circuit diagram of FIG. 9 is a block diagram when a display is attached. 3...Electric blower, 7...Air volume sensor, 9...
Comparison circuit, 10... Memory circuit, 11... Input power control circuit, 15... Electrode plate, 16, 17... Electrode, 18... Capacitor, 22... Variable resistor,
28...Indicator.

Claims (1)

[Claims] 1 An air volume sensor installed in the air flow path, a comparison circuit that compares the output of this air volume sensor with a set value, a memory circuit that stores the output value of this comparison circuit, and an input of the electric blower based on the output of this memory circuit. A vacuum cleaner characterized by having a constant air volume control device comprising an input power control circuit that sets power.