JPS62295636A - Electric cleaner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] 3. Detailed description of the invention Industrial applications The present invention relates to a vacuum cleaner for household use and the like.

Conventional technology Conventionally, vacuum cleaners that aim to improve cleaning efficiency by varying the output depending on the type of floor surface detect the airflow rate of the fan with an airflow sensor, etc., and control the motor rotation speed to maintain a constant airflow rate. It was something to keep.

Problems to be Solved by the Invention When cleaning with a vacuum cleaner, even if the motor output is low, sufficient suction power can be obtained for relatively smooth surfaces such as tatami mats and floors. It can suck up dust, etc., and in the case of carpets, etc., it is necessary to increase the output of the motor to a high output to suck up dust, etc. Such output control can be realized by the means described above, that is, by controlling the air volume to a constant value.

However, the means for detecting air volume is not simple in construction and is expensive, making it difficult to use in household vacuum cleaners and the like. In addition, when using a method that maintains a constant air volume, it has the opposite effect on carpets with long piles; even when the suction port of the vacuum cleaner is placed close to the carpet, the piles are long, so even at low output, the air volume tends to flow through the gaps between the piles. , the output of the vacuum cleaner will be low. However, with long pile carpets, dirt accumulates deep within the pile, so you have to use high power to clean it. In other words, with the conventional method, it was not possible to thoroughly clean carpets with long piles.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention includes a motor for driving a fan, a sound wave output means for outputting sound waves toward the floor surface, and detection of reflected sound of the sound waves from the floor surface. a sound wave input means for
The device includes level detection means for detecting and determining the volume level of the input sound wave, holding means for holding the output of the level detection means, and output control means for controlling the output of the motor by the output of the holding means. .

Function According to the present invention, it is more efficient to use a low power output to clean things such as folds and floors, and in the case of carpets, etc., the longer the bristles are, the more it is necessary to clean the vacuum cleaner with a higher power output. The volume of the output sound wave reflected from the floor surface by the sound wave output means is detected by the sound wave input means, the level detection means, and the holding means. There is little reflection on carpets, etc. That is, the degree of reflection of sound waves is detected, the type of floor surface is detected, and the output of the shimoter is controlled by the output control means so that the output corresponds to the type of the floor surface.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3. In FIG. 1, numeral 1 denotes a sound wave output means, which consists of an ultrasonic speaker 8. Reference numeral 2 denotes a sonic manual output stage, which is composed of an ultrasonic microphone 9. 3 is a level detection means, and an amplifier circuit 10
and an AD conversion circuit 11. 4 is a level holding means, and 5 is an output control means, which is composed of a microcomputer 12 and an output control circuit 13. 6 is a power supply, and 14 is a fan drive motor. When ultrasonic waves are emitted from the ultrasonic speaker 8 toward the floor surface, reflected waves are reflected back at an intensity corresponding to the condition of the floor surface. In other words, strong reflected waves are obtained in places with flat surfaces such as tatami mats or wooden floors, while only weak reflected waves are obtained in places with uneven surfaces such as carpets. This reflected wave is received by the ultrasonic microphone 9. The ultrasonic speaker 8 and the ultrasonic microphone 9 may be attached to the bottom of the vacuum cleaner facing downward as shown in Figure 2, or they may be attached in any other way as long as the waves reflected from the floor can be obtained. It's okay. The reflected wave received from the floor is amplified to an appropriate level by an amplifier circuit 10 and input to an AD conversion circuit 11. The AD conversion circuit 11 encodes the signal according to the level. The encoded signal is taken into the microcomputer 12 and held until the next signal is taken in. The microcomputer 12 performs output control based on the data it holds, and the method for doing so will be described below. A zero volt detection circuit is connected to the microcomputer 12, and generates a pulse when the power supply voltage is zero volts, as shown in FIG. This pulse is recognized by the microcomputer 12, and an output control signal is sent to the output control circuit 13 seconds after pulse generation Δ. Output control circuit 13
is composed of a bidirectional three-terminal thyristor, etc., and by using a signal from the microcomputer 12 as a gate signal, the energization state of the motor 14 becomes as shown in the shaded area in FIG. 3a.

Therefore, by changing the value of ", the phase of the motor 14 can be controlled and its output can be varied. Therefore, if the value of Δt is changed according to the data in the microcomputer 12 converted from the ultrasonic input, an appropriate motor output can be obtained depending on the floor surface.

Effects of the Invention As described above, according to the present invention, the output of a vacuum cleaner motor can be controlled in a simple and inexpensive manner, and the output can be automatically switched to low output when cleaning tatami mats, wooden floors, etc., and high output when cleaning carpets, etc. We can provide an alternative vacuum cleaner with high cleaning efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a circuit showing an embodiment of the present invention, FIG. 2 is an overall side view of a vacuum cleaner, and FIG. 3 is an explanatory diagram of motor output control. 1... Sound wave output means, 2... Sound wave input means, 3... Level detection means, 4...
Level holding means, 5...Output control means, 14...
····motor. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure f Sound wave output means 2 + Tomo Rikiko stage Figure 2 15 runs 8 Kazuyoshi Yanser Figure 3

Claims (1)

[Claims] a motor for driving a fan, a sound wave output means for outputting sound waves toward the floor surface, a sound wave input means for inputting the reflection of the sound waves from the floor surface, a level detection means for detecting the volume level of the input sound waves; A vacuum cleaner comprising: a holding means for holding the output detected by the level detecting means; and an output control means for controlling the output of the motor based on the output of the holding means.