JPH0127733B2 - - Google Patents

Description

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

Conventionally, when the filter of a vacuum cleaner becomes clogged and the air volume decreases, a method of increasing the input power of an electric blower to compensate for this is to install a thyristor 1 in series with the electric blower 100, as shown in FIG.
Some attempts have been made to change the input power of the electric blower 100 by connecting 01 and changing the gate current using a variable resistor 102 linked to a wind receiving plate (not shown). In such a configuration, the resistance value of the variable resistor 102 (position of the wind receiving plate)
Since the input power of the electric blower 100 is determined by, for example, when the air volume decreases due to filter clogging, the position of the wind receiving plate changes, the resistance value decreases, and the gate current of the thyristor 101 increases. As a result, the input power of the electric blower 100 increases. In this type of system, there is a one-to-one correspondence between the position of the wind plate (resistance value of the variable resistor) and the air volume, so if you try to compensate for the decrease in air volume by increasing the input power of the electric blower, the position of the wind plate will increase. A variable resistor must be used that can greatly change the resistance value with a small change in position. It is extremely difficult to manufacture a variable resistor in which the resistance value changes significantly with a slight movement of the variable resistor's slider, and it is practically impossible to produce it. Therefore, the present invention aims to solve the above-mentioned conventional drawbacks, and embodiments thereof will be described below based on the drawings.

In FIG. 2, 1 is a 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. Reference numeral 7 denotes an air volume sensor, which is installed in front of the electric blower 3 and behind the filter 2 in this embodiment, but it can be placed at any position within the air flow path. As shown in FIG. 3, the output of the airflow sensor 7 is input to one input terminal of an amplifier 8, and the variable reference power supply 19 is input to the other input terminal of the amplifier 8. and amplifier 8
outputs the sum or difference between the air volume sensor 7 and the variable reference power source 19 to control the input power control circuit 9 of the electric blower 3.

FIG. 4 shows the P-Q characteristics of the vacuum cleaner when the electric blower 3 is controlled in the above configuration. In FIG. 4, reference numeral 10 indicates the characteristics when the electric blower is directly connected to a power source without connecting a control circuit. As shown in the figure, when the degree of vacuum is low, the air volume is large, which means that the air volume is highest when the floor nozzle is away from the floor, and therefore the power consumption is large. The relationship between this air volume and input power is shown at 10' in FIG. 11 is a conventional example (first
(shown in the figure), the degree of vacuum increases slowly as the air volume decreases.

Therefore, in this case, when the floor nozzle is away from the floor, the air volume is certainly low, and therefore 11'
As shown in Figure 4, the input power is also low, but when the floor nozzle is attached to the floor, that is, on the P-Q characteristic in Figure 4, the air volume 13 at the intersection with the floor resistance curve 12 is low.
is lower than the air volume 14 when no control is performed, and the actual cleaning ability is lower. On the other hand, Fig. 4, 15 shows the P-Q characteristics of a vacuum cleaner using the control system of the present invention, and in this case, even a slight change in air volume causes an input as shown in Fig. 5, 15'. The electric power suddenly increases, the electric blower 3 rotates at high speed, and the degree of vacuum increases. Therefore, the air volume when the floor nozzle is attached to the floor, that is, the air volume determined from the intersection with the resistance curve 12, is 14, which is the same air volume as when no control is performed. This shows that the cleaning ability is equivalent to that without control. However, once the floor nozzle is removed from the floor and the air volume begins to increase, the input power begins to drop rapidly as shown at 15', and when the floor nozzle is in the air, it is much lower than without control. This results in lower input power.

According to the invention, the output of the airflow sensor installed in the air flow path of the vacuum cleaner is amplified by an amplifier, and the input power of the electric blower is controlled by the output, so that the user can operate the floor nozzle. It is possible to provide an energy-saving vacuum cleaner in which the input power decreases when the vacuum cleaner is removed from the floor, and the input power quickly increases when the vacuum cleaner is placed on the floor to exhibit a predetermined cleaning ability.

FIG. 6 shows the method of initial setting of input power, that is, the method of setting input power when the floor nozzle is separated from the floor.
It is a wind receiving plate linked to the wind receiving plate, and is biased by a spring 17. The other end of the spring 17 is connected to an adjustment part such as a screw 18. By moving this screw 17, the urging force changes, and even with the same air volume, the position of the wind receiving plate 16 can be changed and the input power can be changed.

As described above, according to the present invention, the output of the air volume sensor provided in the air flow path is amplified by an amplifier in relation to a variable reference power source, and the input voltage of the electric blower is controlled based on the set value using the output. It is possible to provide an energy-saving vacuum cleaner that is easy to use, has a simple configuration, and has great industrial value.

[Brief explanation of drawings]

Fig. 1 is a wiring diagram of a conventional vacuum cleaner, Fig. 2 is a sectional view of a vacuum cleaner showing an embodiment of the present invention, and Fig. 3 is a sectional view of a vacuum cleaner according to an embodiment of the present invention.
The figure is the electrical wiring diagram, and Figure 4 is the vacuum cleaner's P-
A Q characteristic diagram, FIG. 5 is an explanatory diagram showing air volume and input power, and FIG. 6 is a schematic configuration diagram showing an example of initial input setting. 3...Electric blower, 7...Air volume sensor, 8...
Amplifier, 9... Input power control circuit, 16... Wind receiving plate, 18... Screw, 19... Variable reference power supply.

Claims (1)

[Claims] 1. Connect the output of the air volume sensor provided in the air flow path to the input of an amplifier, and this amplifier compares the input with another variable reference power source and outputs it, and this output is connected to the input power control circuit of the electric blower. A vacuum cleaner characterized in that the electric blower is connected to a control terminal of the electric blower, and the input power of the electric blower is changed according to changes in air volume.