JPH01135325A - Electric cleaner - Google Patents

Abstract

PURPOSE: To retain a constant suction power, and enable effective cleaning, by controlling the revolution of a motor driving a fan so as to increase the revolution stepwise in accordance with the increase of dust. CONSTITUTION: A light emitting part 19 giving out light into an air passage in which dust flows and a light receiving part 20 receiving the light from the light emitting part 19 and outputting signals are arranged so as to face each other, ahead of a motor 12. The passed volume of dust is stored in a memory circuit 22 by the output of a dust detection circuit 21 detecting the output of the light receiving part 20. And further, in a comparison circuit 23, when the passed volume of dust exceeds a specified volume, a signal is output to a phase control circuit 24. That is, the revolution number of the motor 12 is increased stepwise in accordance with the passed volume of dust. As the result, a constant suction power can be retained and effective cleaning can be done and further, the cleaning time can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a vacuum cleaner for general household use.

2. Description of the Related Art As shown in FIG. 6, a conventional vacuum cleaner of this type has a fan and a drive motor 2 built into the main body 1, and the motor 2 is controlled by a switch 4 provided on a hand control section 3. It was something. 6 is a power source.

FIG. 6 shows the amount of dust accumulated in a paper bag (not shown) provided in front of the motor 2 and the change in suction power.

Further, as another conventional example, as in Japanese Patent Application Laid-Open No. 61-213030, LED6. When dust passes through the phototransistor 7, it passes through the dust detection circuit 8 and is displayed on the display circuit 9 (No. 7).
figure).

Problems to be Solved by the Invention However, with the conventional configuration, as shown in Fig. 6, a high suction power is achieved at point A when no dust is being sucked in, but as dust accumulates, the suction power gradually decreases. Put it away. The only way to prevent this decrease in suction power is to replace the paper bag, which increases the cost and puts a burden on consumers. In addition, basic performance was not maintained, and floors could not be properly cleaned.

Further, in other conventional examples as well, merely indicating the passage of dust does not lead to improvement in actual usability, and no effect can be obtained.

In view of the above problems, the present invention provides a vacuum cleaner that can detect the passage of dirt and maintain a constant suction power.

Means for Solving the Problems The technical means of the present invention for solving the above problems is to include a light emitting part that emits light into the air passage through which dust flows, in front of the motor, and a light emitting part that emits light into the air passage through which dust flows. A light receiving section that receives light and outputs a signal is provided facing each other, a dust detection circuit that detects the output of the light receiving section, a storage circuit that stores the amount of passing dust based on the output of the dust detection circuit, The motor is equipped with a comparator circuit that sends a signal to the phase control circuit when the amount of passing dust exceeds a predetermined value, and the number of revolutions of the motor is increased in stages as the amount of passing dust increases.

Effect This effect is as follows. It sucks in dust, emits light, and detects the passing of dust by the light receiving section.When the amount of dust that has passed exceeds a certain value, the motor is controlled to increase its rotational speed, and this operation is repeated. As a result, even if the amount of dust sucked increases, the suction power will not decrease.
Efficient cleaning is maintained.

Embodiment One embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

Reference numeral 11 denotes a main body that includes a motor 12 for driving a fan, a paper bag 13 for collecting dust, and the like. Garbage is sent to the paper bag 13 through a floor suction port 14, an extension pipe 15, and a hose 16. Reference numeral 17 denotes a hand control unit attached to the hose 16, and is provided with a switch for starting and stopping the motor 12.

An LED 19 as a light-emitting part and a phototransistor 2o as a light-receiving part are provided facing each other inside the hand-operated part 17, and when dust passes through these parts, a signal is sent. 21 is a dust detection circuit that detects the output of the phototransistor 20, and 22 is a storage circuit that stores the number of passages of dust based on the output of the dust detection circuit 21. Furthermore, 23 is a phase control circuit 24 that controls the phase of the motor 12 when the number of passing particles exceeds a predetermined value.
This is a comparison circuit that emits a signal to. 26 is phase control circuit 2
This is a bidirectional thyristor that controls the voltage applied to the motor 12 based on the signal from the motor 4. 26 is a power source.

The operation and effect of the vacuum cleaner configured as above will be explained.

When the dust begins to be sucked in, the L provided on the hand control unit 17
EDl 9. The light between the phototransistors 20 is blocked, the dust detection circuit 21 detects this, and the storage circuit 22
send a signal to. Here, the number of dust particles passing through is memorized, and when the number of dust particles is larger than a predetermined number by the comparison circuit 23, a signal is sent to the phase control circuit 24, and the motor 12 is rotated through the bidirectional thyristor 26. It is something that increases the number. Looking specifically at Figure 4, we see that
In the section, when dust accumulates in the paper bag 13, the air volume decreases and the suction power gradually decreases.

However, the number of particles that have passed is detected, and when a predetermined number of particles have passed, a signal is sent from the comparator circuit 23, and the rotation speed of the motor 12 is increased by the phase control circuit 24 through the bidirectional thyristor 26. This increases the work rate. If this operation is repeated, as shown in FIG. 4, the suction power can be kept almost constant as more dust is sucked into the paper bag 13.

Recently, the suction power in a dust-free state has exceeded 200 W even for general household use, but in the conventional system, this corresponds to point A in FIG. However, in actual cleaning, even if the suction power is 200 W or more, if the suction power exceeds about 170 W, the dust collection efficiency on the floor remains almost constant, so it is considered that the cleaning effect is not much different. Therefore, in this embodiment, the initial suction power when there is no dust is set to 170 W at 8 points.

It is more efficient to maintain a constant suction power for a long time at 170W, which provides a sufficient cleaning effect, than to set the initial suction power to 200W and the suction power decreases drastically. This allows for time-saving cleaning.

Furthermore, since the suction power decreases rapidly, the paper bag 13 must be replaced frequently, which burdens the user with maintenance costs.

Incidentally, although the motor 120 rotation speed is gradually increased, since the motor 12 originally has a surplus power of 170 W compared to the 200 W output, there is no problem with durability or the like.

Effects of the Invention As described above, by providing a light emitting and light receiving section in the air passage, detecting the passage of dust, and also detecting the number of passages, and increasing the rotational speed of the motor in stages as the number of passages increases. , the following effects are achieved.

I Even if the amount of dust sucked increases, the suction power does not decrease,
Efficient cleaning is possible and cleaning time can be shortened.

■ There is no need to replace paper bags for a long period of time, and maintenance costs can be kept low.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a vacuum cleaner according to an embodiment of the present invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, Fig. 3 is a circuit diagram of the same, and Fig. 4 is a change in suction power. FIG. 5 is a circuit diagram of a conventional vacuum cleaner, FIG. 6 is a graph showing changes in suction power, and FIG. 7 is a circuit diagram of another conventional vacuum cleaner. 1″2... Motor, 19... Light emitting part (LED), 2o... Light receiving part (phototransistor), 21... Dust detection circuit, 22・・・・・・
...Memory circuit, 23...Comparison circuit. Name of agent: Patent attorney Toshio Nakao and one other person wi
I Figure 12-Motor Figure 3 Figure 4 Figure 5 Figure 6 Garbage amount

Claims (1)

[Claims] In front of the motor, a light emitting part that emits light into the air passage through which dust flows and a light receiving part that receives the light from this light emitting part and outputs a signal are provided facing each other, and the output of this light receiving part is detected. It has a dust detection circuit, a storage circuit that stores the amount of passing dust based on the output of the dust detection circuit, and a comparison circuit that issues a signal to the phase control circuit when the amount of passing dust exceeds a predetermined value. A vacuum cleaner that controls the rotation speed of the motor to increase in stages as the number of revolutions increases.