JPH01151428A - Dust detector in electric cleaner - Google Patents

Abstract

PURPOSE: To improve detection performance of dirts by arranging a light emitting section emitting light in an air path through which dusts flow and a photodetecting part receiving light from the light emitting section each in plurality facing each other longitudinally and radially at a varied angle. CONSTITUTION: When dirts are detected by light emitting sections 29 and photodetecting sections 30 provided radially in plurality at a hand operation part 27, a signal is sent to a phase control circuit 32. A voltage is applied to a motor 22 through a bidirectional thyristor 33 and the number of revolutions automatically increases to develop an intense suction force. The light emitting sections 29 and the photodetecting sections 30 are arranged in a pair radially from the center with respect to a circle of the shape of the cross-section of the hand operation part 27 to minimize a part that does not allow dirts to intercept light from the light emitting section 29. As the adjacent light emitting sections 29 and photodetecting sections 30 are arranged so as to be deviated in position and angle, even when the dirts can not be detected by one pair of the light emitting section 29 and the photodetecting section 30, three- dimensional detection is accomplished securely because the dirts pass through detecting parts many times during the passage thereof thereby enabling efficient cleaning.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a dust detection device for a vacuum cleaner, which detects dust passing through the air passage of the vacuum cleaner and controls the input of a motor, for example. be.

2. Description of the Related Art A conventional vacuum cleaner of this type will be explained with reference to the drawings. 6, in FIG. 6, 1 is the main body of the vacuum cleaner,
A motor 2 for driving the fan is built inside. Reference numeral 3 denotes a hand control section of the vacuum cleaner, which has a cylindrical cross-sectional shape, and has a switch 4 for turning off the motor 2, a light emitting section 6 such as an LED, and a light receiving section 6 such as a phototransistor. A pair of these parts are provided opposite each other, and when dirt passes through these parts, a signal is sent.

A dust detection circuit 7 detects the output of the light receiving section 6 and sends a signal to a phase control circuit 8 inside the main body 1. Reference numeral 9 denotes a bidirectional thyristor that controls the voltage applied to the motor 2 based on this signal. 10 is a power source.

To explain the operation of the vacuum cleaner configured as above, when dust is detected by the light emitting part 5 and the light receiving part 6 provided in the hand control part 3, a signal is sent to the phase control circuit 8, and both Motor 2 through tropic thyristor 9
When voltage is applied to the machine, its rotational speed automatically increases, creating a strong suction force. Then, after the dust has passed, it descends again.

As another conventional example, as shown in FIG. 7, when dust passes between the light emitting section 5 and the light receiving section 6, the display circuit 11 indicates that the dust has passed through the dust detection circuit 7. Publication number 61-213030).

Problems to be Solved by the Invention However, in the conventional configuration described above, as shown in FIG.
Since there are only a pair of , it is possible to sense even if dirt passes through the shaded area A, but it is impossible to increase the rotation speed of the motor 20 or to indicate that the dirt has passed. In other words, it does not fulfill its function. In particular, small dust tends to adhere to the wall surface of the hand-held operation unit 3 due to static electricity and cannot be detected.

Further, as shown in FIG. 5B, if water is sucked in, either the light emitting section 5 or the light receiving section 6 will malfunction, and the function of sensing dust will no longer be achieved.

In view of the above problems, the present invention provides a dust detection device for a vacuum cleaner with improved dust detection performance.

Means for Solving the Problems The technical means of the present invention for solving the above problems is to provide a light emitting part that emits light in the air passage through which dust flows, and a light emitting part that receives light from the light emitting part. A plurality of light receiving sections for outputting signals are arranged radially so as to face each other with different air passage directions and angles.

Effect This effect is as follows. By detecting dust in the air passage three-dimensionally, the area that cannot be sensed is extremely reduced, making it possible to reliably transmit the passage of dust as a signal, and also detecting the passage of smaller dust, making it possible to detect dust. This provides improved functionality and efficient cleaning.

Furthermore, even if water is accidentally inhaled, basic functionality can be maintained because the light-emitting part and light-receiving part are mounted at different angles, and some parts remain that will not malfunction unless immersed in water.

EXAMPLE An example of the present invention will be described below with reference to the drawings. 1st
In the figures, 21 is a main body that includes a motor 22, a paper bag 23, etc. A floor suction device 24 is connected to the paper bag 23.
, an extension pipe 25 , and a hose 26 . Reference numeral 27 denotes a hand control unit with a circular cross section attached to the hose 26, and is provided with a switch 28 for starting and stopping the motor 22.

Inside the hand operation unit 27, there is a light emitting unit 29 such as an LED, a light receiving unit 30 such as a phototransistor, and the like.
They are arranged radially at slightly different angles, and when dirt passes through these parts, a signal is sent out. 3
1 is a dust detection circuit that detects the output of this light receiving section 30; 3
2 receives the output of this dust detection circuit 31, and
This is a phase control circuit that sends a signal to the bidirectional thyristor 33 that controls the voltage applied to the thyristor 33. 34 is a power source.

To explain the operation of the vacuum cleaner configured as above, when dust is detected by the light emitting parts 29 and the light receiving parts 30 provided radially in the hand operation part 27,
A signal is sent to the phase control circuit 32, voltage is applied to the motor 22 through the bidirectional thyristor 33, the rotational speed is automatically increased, and a strong suction force is exerted. and,
After the dust has passed, the rotational speed of the motor 22 decreases again.

Here, the light emitting section 29 and the light receiving section 30 are arranged in pairs radially from the center of the circular cross-sectional shape of the hand operation section 27, so that dust cannot block the light from the light emitting section 29. Portions are smaller. In addition, since the adjacent light emitting section 29 and light receiving section 3o are arranged with shifted positions and angles, it is possible to three-dimensionally detect the time when the dust passes through, even if the pair of light emitting section 2e1 and the light receiving section 30 cannot detect it. Detection is reliable because it passes through the detection part many times.

Therefore, depending on the location where the trash passes, the
There is no such thing as a failure to clean the floor; the passage of dirt is reliably detected, the dirt status of the floor surface is accurately grasped, and the rotational speed of the motor 22 is increased to enable efficient cleaning. .

Furthermore, since the detection range within the circular cross section has been expanded, even small particles that could not be detected in the past can be detected without omission, making efficient cleaning possible.

Furthermore, as shown in Fig. 3, if water is accidentally inhaled, the light receiving section 3° located below may break down and become non-functional due to the influence of the water shown in X. Further, a light emitting section 29 and a light receiving section 30 are provided at an angle with respect to the vertical direction.
Since this is provided, other elements are not affected. Therefore,
Although the dust detection range becomes a little smaller, the basic functions of detecting dust and controlling the rotation speed of the motor 22 can be maintained.

In the above embodiment, the rotational speed of the motor was controlled using the output of the light receiving section, but the purpose of control is not specified; for example, it is also possible to control a dust passing amount indicator.

Effects of the Invention As described above, the present invention includes a plurality of light-emitting parts that emit light and light-receiving parts that receive light from the light-emitting parts in an air passage through which dust flows, so that the light-emitting parts face each other, one behind the other, In addition, by radially providing them at different angles, the following effects can be achieved.

(2) It is possible to detect three-dimensionally no matter where the dirt passes, and by reliable detection of dirt, it is possible to accurately grasp the dirt status of the floor surface.

It can detect even small particles in the mouth, further improving detection efficiency.

■Even if water is inhaled, functionality is maintained and durability is improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a dust detection section in an embodiment of the present invention, FIG. 2 is a partially cutaway sectional view of a vacuum cleaner, and FIG.
The Moom sectional view in the figure and FIG. 4 are the same circuit diagrams. FIG. 5 is a sectional view of a conventional dust detection device for a vacuum cleaner, and FIG. 6 is a circuit diagram thereof. FIG. 7 is a block diagram of another conventional dust detection device for a vacuum cleaner. 29... Light emitting section, 30... Light receiving section. Name of agent: Patent attorney Toshio Nakao and 1 other person29
-Light emitting part 30- Wheat tip part Fig. 1 q Fig. 4 Fig. 5 Fig. 6

Claims (1)

[Claims] In the air passage where dust flows, a plurality of light emitting parts that emit light and light receiving parts that receive light from the light emitting part and output a signal are arranged so as to face each other, and their positions are shifted in the angle and direction of the air passage. A vacuum cleaner dust detection device installed radially.