JPH02307421A - Operation of electric vacuum cleaner - Google Patents

Abstract

PURPOSE:To reduce a sudden change of a motor speed and to heighten its controllability, by a method wherein the motor speed raised by dust-detection at a dust-sending part is, by stages, returned to an initial preset speed prior to the dust-detection whenever a specified time elapses. CONSTITUTION:Until dusts are detected, a motor speed is kept at the level of a line 19 and when the dusts are detected, the motor speed is raised at the level of a line 20. After a specified keeping time elapses, the motor speed is dropped at the level of a line 21. After that, after the speed is kept at the level of the line 21 during a time, e.g., one second, the speed is dropped at the level of a line 22, and once more, after one second, the speed is returned at the initial level of the line 19. In this way, since the motor speed raised by the dust-detection is returned at a preset speed prior to the dust-detection after it is dropped by stages, a sudden change of the motor speed is reduced and its controllability can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a vacuum cleaner for industrial and household use in which the number of revolutions of a motor can be controlled.

Conventional technology In recent years, with the spread of carpets as people's lifestyles have become more Westernized, 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 target to be vacuumed, allowing cleaning to be performed with the minimum amount of suction air required, resulting in labor savings and quiet operation.

In addition, a dust sensor is provided between the suction port and the dust collector, and when dust is detected, the rotational speed of the motor is automatically increased to ensure that the dust is sucked in.

Hereinafter, the conventional vacuum cleaner as described above will be described with reference to the drawings. FIG. 4 is an electrical circuit diagram of a conventional vacuum cleaner. In FIG. 4, numeral 1 is a switch for variable control of the rotation speed of the motor 2 using the hand control unit of the electric cleaner; by operating this switch 1,
The bidirectional thyristor 4 varies the conduction angle of the AC M source 5 with respect to the motor 2 in response to a gate signal output from the phase control circuit 3, thereby varying the rotation speed of the motor 2.

A light emitting diode (hereinafter referred to as ED) 6 is connected to a constant voltage source 14 via a current limiting resistor 7, and a phototransistor 8 that receives light from the LED 6 is connected to the constant voltage source 14 via a load resistor to The intensity of the light from the LED 6, which is caused by the presence or absence of dust, is converted into a change in current. This voltage change at the collector end of the phototransistor 8 is transmitted to the amplifier 11 by a capacitor 10 connected to the collector.

The output of the layer width converter 11 is compared with a reference voltage 13 by a comparator 12 and input to the phase control circuit 3.

The operation of the vacuum cleaner configured as described above will be explained. By operating the switch 1 built into the hose hand control section of the vacuum cleaner, a phase-controlled current is applied from the phase control circuit 3 to the bidirectional thyristor 4, causing the motor 2 to rotate at a predetermined set rotation speed. do.

Here, as shown in figure ff15, the sucked dust 15 is
When passing between the ED 6 and the phototransistor 8, the collector potential of the phototransistor 8 changes, and this change is transmitted to the microcomputer (referred to as the jX lower microcomputer) inside the phase control circuit 3 via the capacitor 10, amplifier 11, and comparator 12. A gate signal is sent from the phase control circuit 3 to the bidirectional thyristor 4 so as to increase the rotation speed of the motor 2.

In the operating state explanatory diagram of FIG. 6, the rotational speed 17, which has increased due to the detection of dust, returns to the level of the rotational speed 16 set by the switch 1 after a predetermined holding time {circle around (2)} has elapsed.

Problems to be Solved by the Invention However, in the conventional configuration described above, dust is intermittently detected in order to return the motor to the rotation speed set by switch 1 after a predetermined holding time after the motor rotation speed increases. There were problems with operability, such as frequent rapid changes in the motor's rotational speed and sudden changes in the sound when the motor was in use.

The present invention solves the above-mentioned conventional problems, and aims to provide a vacuum cleaner that reduces rapid changes in the rotational speed of the motor and improves operability.

Means for Solving the Problems In order to solve the above problems, the method for operating a vacuum cleaner of the present invention is to reduce the number of rotations of the motor, which is increased by detecting dust with a dust sensor part, in stages at predetermined intervals. The rotation speed is restored to the set rotation speed before detection.

Effect: With this configuration, when the motor rotation speed that has increased due to dust detection is returned to the set rotation speed before dust detection, the motor rotation speed is returned to the set rotation speed in stages with time intervals, so that the motor rotation speed does not change suddenly. It disappears.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

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

The operation of the vacuum cleaner configured as described above will be explained. FIG. 1 is an explanatory diagram of the operating state of the vacuum cleaner. In Fig. 1 (A), until dust is detected, the motor rotation speed is maintained at 19, which was set with switch 1, and when dust is detected, the motor rotation speed is increased to a level of 20, and the predetermined holding time has elapsed. After that, I did not reduce the motor rotation speed to the level of 21. Next, after holding the rotation speed at level 21 for one second, for example, the rotation speed is reduced to level 22, and after another second, the rotation speed is returned to the initial level of 19.

Furthermore, as shown in FIG. 1(B), even if the degree is detected within the holding time at level 22, for example, it is possible to increase the rotational speed to level 20.

FIG. 3 is a flowchart for realizing the above embodiment. After setting the rotation speed of the motor with switch 1, the process shown in FIG. 3 is carried out until the rotation is stopped.

Note that in this example, the holding time was 1 second, but
It may be set arbitrarily, and the configuration may be such that the user can set it freely.

Furthermore, in this embodiment, two levels of rotational speed are set between the rotational speed levels 19 and 20, but multiple levels such as three levels may be used.
You may also configure a location etc.

Effects of the Invention As described above, according to the present invention, the motor rotation speed that has been increased due to dust detection is gradually reduced and returns to the set rotation speed before dust detection, so that sudden changes in the motor rotation speed can be prevented. can be reduced and operability improved.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the operating state of a vacuum cleaner according to an embodiment of the present invention, Fig. 2 is an electric circuit diagram for realizing the electric vacuum cleaner, and Fig. 3 is a flowchart of the electric vacuum cleaner. Fourth
5 is a sectional view of a dust sensor when detecting dust, and FIG. 6 is an explanatory diagram of the operating state of the vacuum cleaner in the conventional example. 6... Light emitting diode, 8... Phototransistor, 12... Comparator, 18... Phase control circuit. Fig. 1 Time a Fig. 2 6 --- Light absorption ion?・-・Phototransistor tag 2---- Grain layer H on top Fig. 3 Fig. 4 Hose call J cross II 5 Fig. 5 Fig. 6

Claims (1)

[Claims] 1. When dust is detected by the dust sensor installed in the electric flow path taken in by the motor, the motor rotation speed is changed, held for a predetermined time, and then the motor rotation speed is gradually increased at predetermined intervals. How to operate a vacuum cleaner to return to the set rotation speed before dust detection.