JPH01285236A - Dust detector for vacuum cleaner - Google Patents

Abstract

PURPOSE:To improve the reliability for detecting dust, handleability and maintenance work by a method wherein, at a suction port, a light emitting device which emits light and a light receiving device which inputs the light from the light emitting device and outputs its signal, are provided in facing each other so as to put an air flow path between them, and a motor speed is controlled by the signal from the light receiving device. CONSTITUTION:When dust is detected by a LED 36 and a phototransistor 37 which are fitted in a packing 35 for a suction port, the speed of a motor 22 is automatically increased and strong suction force is obtained, since its signal is inputted to a phase control circuit 39 and voltage is applied to the motor 22 through a two-way thyristor. After the dust passes through, the speed of the motor 22 is restored to the original speed again. On the other hand, when the phototransistor 37 does not catch the light signal emitted from the LED 36 for a specified time or more, the motor 22 is stopped and a warning lamp 43 is turned on.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a dust detection device for a vacuum cleaner that detects dust passing through an air passage of the vacuum cleaner and controls the input of a motor.

2. Description of the Related Art A conventional vacuum cleaner of this type will be explained with reference to the drawings. 6 to 7, 1 is the main body of the vacuum cleaner with a built-in motor 2t, and in front of it is a hose 3, an extension pipe 4. It has a floor suction tool 5t. A tip end pipe is fixed to the hose 3, and the end thereof is removably fitted to an extension pipe 4. 7 is a switch for starting and stopping the motor 2; Furthermore, a pair of LKD 8 and phototransistor 9 are provided inside the tip pipero, facing each other, and when dust passes through this portion, a signal is transmitted.

A dust detection circuit 10 detects the output of the phototransistor 9 and sends a signal to a phase control circuit 11 inside the main body 1. A bidirectional thyristor 12 controls the voltage applied to the motor 2 based on this signal. 13 is a power source.

The operation of the vacuum cleaner configured as described above will be explained. When dust is detected by the LED 8 and phototransistor 9 provided on the tip pipe 8, a signal is sent to the 1-phase control circuit 11.

Voltage is applied to the motor 2 through the bidirectional thyristor 12, and the rotation speed of the motor 2 is automatically increased to exert a strong suction force. Then, after the dust has passed, it descends again.

Furthermore, as another conventional example, JP-A-61-213030
When dust passes between the LXD 8 and the phototransistor 9, the display circuit 14 displays the passage through the dust detection circuit 1° (No. 8).
figure).

In addition, another conventional example is shown in FIG.
A paper bag 16 is inserted into the front dust collection chamber 16. When the paper bag 16 is filled with dirt, the pressure inside the dust collection chamber 16 decreases, and the indicator 18 moves forward at the same time as the indicator spring 17 provided above due to the pressure difference with the outside air pressure. At this time, the user looks at the indicator 18 from the window 19.
By knowing the movement of the paper bag 16, the user is informed that it is time to replace the paper bag 16. 20 is an intake port into which the hose 3 is inserted.

Problems to be Solved by the Invention However, in the above configuration, the tip pipe has 8 LEDs,
Since the phototransistor 9 and the dust detection circuit 1o are provided, the weight of the operating part at the user's hand becomes heavy, making cleaning tiring.

In addition, the pipe tip was easily dropped to the floor and was prone to failure.

Furthermore, a signal line is required for the dust detection circuit 10 up to the tip pipe, and for this purpose, it is necessary to provide a signal line inside the hose 3 along with a signal line to the switch 7 for starting and stopping the motor 2. . Therefore hose 3
It was heavy, inconvenient to use, and tiring to clean.

Also, 'LRD8. When the surface of the phototransistor e becomes dirty, it must be cleaned, but the tip pipe has a small inner diameter, making cleaning difficult and not easy to maintain.

In addition, in the configuration of the indicator 18 in FIG.
When air-permeable dust such as cotton dust is sucked into the paper bag 16, the pressure in the dust collection chamber 16 does not decrease much and the indicator 18 does not operate. Therefore, the garbage protrudes from the paper bag 16 and the air inlet 20. This extended to hose 3, making it impossible to notify the user that it was time to replace the paper bag.

In view of the above-mentioned problems, the present invention aims to improve the reliability of dust detection, ease of use, and ease of maintenance, and provides a dust detection device for a vacuum cleaner that can appropriately notify when it is time to replace a paper bag. .

Means for Solving the Problems The technical means of the present invention for achieving the above objects are as follows:
For inserting the connecting pipe fixed to the end of the hose.
A light-emitting part that emits light and a light-receiving part that receives the light from the light-emitting part and outputs a signal are placed across the air passage in the air intake port provided in the lid that covers the upper part of the dust collection chamber into which the paper bag is inserted. The motor rotation speed is controlled by a signal from the light receiving section.

Effect This effect is as follows. When a paper bag inserted into the dust collection chamber sucks air-permeable dust such as cotton dust, the suction power of the vacuum cleaner itself does not decrease much, so it continues to be sucked in and overflows from the paper bag to the hose side. However, since the light emitted from the light emitting part provided at the intake port is cut off, the motor can be stopped.

Furthermore, by removing the hose connection pipe, the surfaces of the light emitting section and the light receiving section on the air passage side provided in the intake port can be easily cleaned, improving maintainability.

Example An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 21 denotes a main body that includes a motor 22, a cord reel (not shown), and the like. A paper bag 24 is attached to the dust collection chamber 23 in front of the main body 21. A floor suction device 26 is connected to the paper bag 24.
, extension pipe 26. Garbage is sent through the hose 27. A hand control unit 28 is attached to the tip of the hose 27, and a switch 29 is used to start and stop the motor 22.
is the provision. Further, the other end of the hose 27 has a main body 22.
A connecting pipe 32 is fixedly attached to the air intake port 31 of the lid 3o, which covers the upper opening of the dust collecting chamber 23, and is detachably attached thereto.

Reference numeral 33 denotes an intake port rotating body provided inside the lid 30, which fixes the connecting pipe 32 of the hose 27 and rotates at the same time.

Reference numeral 34 denotes an opening paper provided on the paper bag 24, which connects the intake port gasket 3.
6, air tightness with the intake port rotating body 33 is achieved.

Inside this intake port gasket 36 is an L ICD 3e.

A phototransistor 37 is placed facing each other, and when dust passes through this portion, a signal is transmitted.

38 is a dust detection circuit that detects the output of this phototransistor 37, and 39 is a phase control circuit that receives the output of the dust detection circuit 38 and sends a signal to the bidirectional thyristor 4o that controls the voltage applied to the motor 22. be. 41 is a power source.

42 is a phase control circuit 3 when the phototransistor 37 does not receive light from the LED 36 for a certain period of time or more.
9 is an alarm means that issues an alarm, and in this embodiment, the signal is received from the outside of the main body 21.

A warning light 43t is provided.

To explain the operation of the vacuum cleaner configured as above, the L]ED36 provided in the intake port gasket 36
When dust is detected by the phototransistor 37, a signal is sent to the phase control circuit 39, voltage is applied to the motor 22 through the bidirectional thyristor 4o, the rotation speed of the motor 22 is automatically increased, and strong suction is detected. Demonstrate strength. After the dust has passed, the rotational speed of the motor 22 decreases again.

Further, when the phototransistor 37 does not receive light from the LED 36 for a certain period of time or more, the motor 22 stops rotating and the warning light 43 lights up at the same time.

Here, as shown in FIG.
Since the suction force of the main body 21 does not decrease much, the suction continues steadily, and the paper bag 24 overflows and comes out in the direction of the connecting pipe 32. At this time, since the light from the LKI) 36 is completely cut off, the phototransistor 37 cannot receive any light, and if this state continues for a certain period of time, the motor 22 will be stopped and the warning light 43 will be turned on. Become. In this way, the LXD 36. By providing the phototransistor 37, it becomes possible to carry out normal rotational speed control of the motor and at the same time to appropriately notify the user when it is time to replace the paper bag 24.

In addition, when the connecting pipe 32 is removed from the main body 21 after cleaning, the dust does not spill out, and the inside of the dust collection chamber 23 is prevented from being contaminated with overflowing dust when the paper bag 24 is replaced.

Furthermore, if the surfaces of the LIED 36 and phototransistor 37 become dirty and the dust detection function deteriorates, by removing the connecting pipe 32 of the hose 27, they can be easily seen from above and cleaned. It is easy to maintain.

Another embodiment is shown in FIG. 6, in which the connecting pipe 32 is made of a transparent material and the length is set to 240 paper bags 34.
If it is extended to this extent, it is possible to have the effect of removing dust adhering to the surface of the LIEDse and the phototransistor 37 on the outer peripheral surface when the connecting pipe 32 is attached or detached.

Furthermore, LKD36. The phototransistor 37 is connected to the main body 2.
By arranging it to the intake port 31 of No. 1, the hand operation section 28
There is no need to send a signal line to the terminal, the hose 27 becomes lighter, and usability is improved.

Furthermore, compared to the hand-held operating section 28, it is less susceptible to impact and has improved durability.

Effects of the Invention As described above, the present invention includes a light emitting part that emits light at the intake port of the main body into which a connecting pipe provided on a hose is inserted, and a light receiving part that receives light from the light emitting part and outputs a signal. The motor is provided with two parts facing each other across an air passage, and the rotation speed of the motor is controlled by the signal from the light receiving part, and the motor is stopped when no light is received from the light emitting part for a certain period of time. There is, and the following effects are achieved.

! In addition to controlling the motor rotation speed by detecting dust, it is also possible to appropriately notify the user when to replace the paper bag.

``It is hygienic without spilling garbage.

311CD, phototransistor cleaning becomes easier,
Improves maintainability.

■The hose is lighter and easier to use.

■It is less susceptible to impact and has improved durability.

[Brief explanation of the drawing]

Fig. 1 is an external view of a vacuum cleaner according to an embodiment of the present invention, Fig. 2 is a cross-sectional view of the same main part, Fig. 3 is the same electric circuit diagram, and Fig.
The figure is a cross-sectional view of the same main part, showing a state where it is clogged with dust. 6th
The figure is a sectional view of main parts of a vacuum cleaner in another embodiment, No. 6
The figure is an external view of a vacuum cleaner in a conventional example, Figure 7 is an electric circuit diagram of the same, Figure 8 is an electric circuit diagram of a vacuum cleaner in a second conventional example, and Figure 9 is an electric circuit diagram of a vacuum cleaner in a third conventional example. It is a sectional view of a vacuum cleaner. 21. Main body, 22. Motor, 24.
...Paper bag, 31...Intake port, 3'2...
... Connection pipe, 36 ... Intake donkey, connector, 36 ... LED, 37 ... Phototransistor, 38 ... Dust detection circuit. 39... Phase control circuit. Name of agent: Patent attorney Toshio Nakao and one other person;
- 1 ＋＋

Claims (1)

[Claims] A main body having a motor chamber containing a motor, a cord reel, etc., and a dust collection chamber in which a paper bag is inserted in front of the motor;
The cover includes a lid that covers the upper opening of the dust collection chamber and has an intake port for inserting a connecting pipe fixed to the end of the hose, and the intake port of the lid includes a light-emitting part that emits light. A vacuum cleaner that has a light receiving part that receives light from the light emitting part and outputs a signal facing each other across an air passage, and controls the rotation speed of the motor built into the main body based on the signal from the light receiving part. dust detection device.