JPH0339130A - Controller of vacuum cleaner - Google Patents

Abstract

PURPOSE:To secure necessary rotational frequency and suppress noise and enable operation to be performed quietly and comfortably by setting a quiet operation mode, and by regulating the maximum level of rotational frequency of a motor according to the change of a dust quantity, to change the level. CONSTITUTION:A quiet operation mode 19 is selected by operating a switch 1, and is controlled by a phase controlling circuit 18. Rotational frequency when no dust is detected is set to be lower than that 22 when no dust is detected in a standard mode 20, and sound is quietly set. When a small quantity of dust 23 is detected, then the rotational frequency of a motor is increased by one step, and when a medium quantity 24 of the dust is detected in the same manner, then the rotational frequency is increased by one step more. Then, in any case, the rotational frequency is set to be lower than that in the standard mode 20. When a large quantity 25 of the dust is detected, then the rotational frequency is controlled not to be increased till the level of rotational frequency 21 when the motor is fully electrified, and the then rotational frequency is set to be maximum rotational frequency in the quiet operation mode 19.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a control device for industrial and household vacuum cleaners in which the rotational speed of a motor can be controlled.

Conventional technology In recent years, as people's lifestyles have become more Westernized and carpets have become more popular, vacuum cleaners are required to have a high suction power in order to reliably suck up dust from the pile of the carpet. The electrical input has also increased.

Furthermore, the rotational speed of the vacuum cleaner's motor can be selectively controlled depending on the object to be cleaned, allowing for quiet operation that allows cleaning with the minimum amount of suction air required.

Additionally, a dust sensor is installed between the suction port and the dust collector, and when dust is detected, the motor rotation speed is automatically increased to ensure dust is sucked in.

Hereinafter, the conventional vacuum cleaner as described above will be explained with reference to the drawings. In Fig. 3, numeral 1 is a switch for variable control of the rotation speed of the motor 2 using the hand control unit of the vacuum cleaner.By operating this switch 1, a gate signal is output from the phase control circuit 3. The two-way thyristor 4 varies the conduction angle of the AC power source 6 to the motor 2, thereby varying the rotation speed of the motor 2.

6a is a light emitting diode, 7 is a current limiting resistor thereof, and 8b is a phototransistor that receives light from the light emitting diode 6a.
The sensor detects the amount of light passing through the light emitting diode 6a according to the amount of dust sucked in and converts it into a current change. 9 is a load resistance of the phototransistor 6b. 10
is a capacitor for transmitting the voltage change at the collector end of transistor b) to the amplifier 11. The output from the amplifier 11 is compared with a comparison voltage 13 by a comparator 12 and input to the phase control circuit 3. 14 is a constant voltage source.

The operation of the vacuum cleaner configured as above will be described above.

Switch 1 built into the vacuum cleaner's hose control unit
By operating , a phase-controlled current is applied from the phase control circuit 3 to the bidirectional thyristor 4, and the motor 2 rotates at a predetermined set rotation speed.

Here, as shown in FIG. 4, when the amount of dust 16 sucked in changes, the amount of light reaching the shift transistor 6b from the light emitting diode 6d changes, so the collector potential of the phototransistor 6b changes and its The result is capacitor 1
Phase control circuit 3 via o+m width converter 11 and comparison 12
A gate signal is input to an internal microcomputer (hereinafter simply referred to as microcomputer) and sent from the phase control circuit 3 to the bidirectional thyristor so as to increase or decrease the rotation speed of the motor 2. Thereby, the rotation speed of the motor can be changed in multiple stages depending on the amount of dust detected by the dust sensor section 8.

With switch 1, you can also select silent operation in which the motor 20 rotation speed is fixed at a low constant rotation speed.

Problems to be Solved by the Invention However, with the conventional configuration described above, if silent operation is selected, only a constant rotation speed can be obtained, whereas if automatic operation using the dust sensor is selected, the motor will rotate at the maximum rotation speed. However, there was a paradox that it was noisy.

The present invention solves the above-mentioned conventional problems, and even when silent operation is selected at the control panel, the rotation speed is changed within the set rotation speed when dust is detected.
To provide a vacuum cleaner that can clean quietly with the minimum number of revolutions necessary to ensure suction power.

Means for Solving the Problems To achieve this object, the vacuum cleaner of the present invention has a silent operation mode, sets the motor rotation speed low, and when the dust sensor section detects dust, It has a control means for rotating the motor at a set rotation speed.

By this means, if you select the static pressure mode and operate the vacuum cleaner, the rotation speed can change within the set range depending on the amount of dust, and if you set the maximum rotation speed to an appropriate value, It becomes possible to clean quietly.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 2 is an electrical circuit diagram of a vacuum cleaner according to the present invention. In FIG. 2, 18 is a phase control circuit. In addition,
Since the present embodiment shown in FIG. 2 basically has the same configuration as the conventional device shown in FIG. 4, the same components are given the same numbers and detailed explanations will be omitted.

The operation of the vacuum cleaner configured as above will be described below.

FIG. 1 is an operating state diagram of the vacuum cleaner of the present invention, and 19 is a
2o represents the change in rotational speed depending on the amount of dust in each of the quiet mode and standard mode. 21 is the number of revolutions when the motor is fully conductive.

The silent mode shown at 19 is selected by operating the switch 1 and controlled by the phase control circuit 18. The rotation speed when no dust is detected is set lower than 22 when no dust is detected in the standard mode, thereby making the gutter 2 quieter. When a small amount of dust, indicated by 23 in FIG. 1, is detected, the rotational speed of the motor is increased by one step, and similarly, when a medium amount of dust is detected, the rotational speed is increased by another step. In either case, the rotation speed in the standard mode is set. Even when a large amount of noise is detected (1st Europe 6), as shown in the same figure, the rotation speed is controlled so as not to increase at 21 level lv1, and the rotation speed at this time is the maximum rotation speed that can be pressed to silent mode. shall be.

As mentioned above, by regulating the maximum rotation speed in silent mode and changing it in a region lower than that rotation speed,
Noise can be kept low.

Incidentally, in the embodiment shown in FIG. 1, the rotation speed was changed in four stages depending on the amount of dust, but it may be set in any number of stages.

Moreover, the silent mode may be set not only in one pattern but also in a plurality of patterns, such as silent modes 1, 2, . . . .

Further, as in the standard mode, a display device for displaying the amount of dust and the number of rotations may be provided.

Furthermore, the user may be able to arbitrarily select the maximum rotation speed in the silent mode.

Effects of the Invention As described above, the present invention provides a silent mode and regulates and changes the maximum level of rotation speed according to changes in the amount of dust, thereby ensuring the necessary rotation speed, suppressing noise, and achieving quiet operation. This makes it possible to create an excellent vacuum cleaner that can be operated comfortably.

[Brief explanation of drawings]

FIG. 1 is an operating state diagram of a vacuum cleaner according to an embodiment of the present invention, FIG. 2 is an electric circuit diagram of a vacuum cleaner according to an embodiment of the present invention, and FIG. 3 is an electric circuit diagram of a conventional example. FIG. 4 is a sectional view of the dust sensor section. 2...Motor, 8...Dust sensor section.

Claims (1)

[Claims] A dust sensor section is provided in the air flow path to detect passing dust, and the electric power of the motor is controlled based on the signal from the dust sensor section. A control device for a vacuum cleaner in which a rotation speed corresponding to the dust sensor output can be set in a mode.