JPS631847B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a suction port for a vacuum cleaner, and particularly to a suction port for a carpet.

(Prior Art) Generally, this type of suction port has a rotating brush that is located inside the suction port body and projects outward from the dust suction opening at the bottom of the main body, and a dust suction passage that is connected to the dust suction opening. It is equipped with an impeller that is rotated by the suction air flow, and a transmission means that is interposed between the rotating brush and the impeller and rotates the rotating brush as the impeller rotates, and the rotating brush has the effect of scraping up and sucking in dust. The dust-absorbing action of the airflow makes it possible to efficiently clean carpets.
(see publication). In such a suction port, if the filter becomes increasingly clogged, not only will the dust suction effect of the suction air flow decrease, but the rotational speed of the rotating brush will also decrease, which will also reduce the dust scraping effect. As a result, it becomes impossible to clean the toilet effectively. Therefore, in order to be able to constantly and efficiently clean the carpet, it is necessary to be able to constantly monitor changes in the dust suction power.

On the other hand, a vacuum cleaner that was able to display the dust suction power at the suction port was developed in 1973.
This is proposed in Publication No. 69960. In this proposal, another suction passage is provided in the suction port body in addition to the dust suction passage, and this suction passage is provided with an indicating impeller that rotates with the air flow, and the change in the pattern on the end surface of this impeller is monitored. By looking through the display window,
This makes it possible to determine the strength of the dust suction power.

(Problem to be solved by the invention) By the way, the suction port for the carpet was opened in 1973.
If a dust suction power display device such as that shown in Publication No. 69960 is adopted, it is possible to know the performance deterioration of the carpet cleaning due to filter clogging, but the following problems still remain.

For example, even if the filter is not clogged and the suction airflow is sufficient to absorb dust, if the impeller is locked by foreign matter or the rotation speed decreases due to lint or other entanglements, A situation occurs in which the raking action of the rotating brush is extremely reduced, making it impossible to efficiently clean the carpet. In such a case, the above-mentioned conventional display device has the disadvantage that it is incorrectly determined that the carpet is in a state suitable for cleaning.

In addition, in the above-mentioned conventional display device, the pattern on the end surface changes slightly depending on the rotation speed of the display impeller, and it is necessary to judge whether it is suitable or not based on the subtle change, and the judgment itself has a large variation. It is something that occurs.

However, the present invention provides a suction port for a vacuum cleaner that can accurately determine whether or not it is in a state suitable for carpet cleaning, and can also accurately recognize the state at a glance.

(Means for Solving the Problems) The present invention solves the above problems, and the details thereof will be explained below using drawings corresponding to embodiments.

Utilizing an impeller 11 that is rotated by the suction air flow flowing through the dust suction passage 5 and rotates the rotating brush 7,
A generator 15 that generates electricity by the rotation of this impeller 11
will be established. Then, the voltage generated by this generator is compared with a preset reference voltage, and the rotating brush 7 is
The display lamp 16 is controlled by the rotation detection means and switches from being lit to being turned off or from being turned off to being turned on when the voltage generated by the generator 15 falls below a reference voltage. It is prepared.

(Function) With the above configuration, when the rotational speed of the impeller 11 decreases due to a decrease in suction airflow due to filter clogging, or when the rotational speed of the impeller 11 decreases due to locking due to foreign matter or entanglement of lint, In either case, it can be accurately determined that the voltage generated by the generator 15 is below the reference voltage and the condition is not suitable for carpet cleaning, and the determination result can be accurately recognized by the state of the indicator lamp 16. There is no variation in recognition.

(Example) Examples of the present invention shown in the drawings will be described in detail below.

First, in the suction port for the carpet shown in FIGS. 1 to 3, reference numeral 1 denotes a suction port body which has a sled 2 having a dust suction opening 3 installed at the bottom and connects a suction pipe 4 to the rear part. A dust suction passage 5 communicating between the dust suction opening 3 and the suction pipe 4 is formed. Reference numeral 6 indicates brush bristles disposed laterally in front of the dust suction opening 3;
7 is rotatably supported by a bearing 8, and the dust suction opening 3
It is a rotating brush that projects outward through the partition wall 9 and is positioned outside the dust suction passage 5 by penetrating the partition wall 9 at both ends thereof, and has a tooth-shaped pulley 10 at one end thereof. Reference numeral 11 denotes an impeller located inside the dust suction passage 5 and rotated by the suction air flow.A shaft 12 of the impeller is positioned outside the dust suction passage 5 with both ends thereof penetrating the partition wall 9, and has a tooth-shaped pulley 13 at one end. A belt 14 is stretched between the pulleys 10 and 13 and together constitutes a deceleration transmission means, which rotates the rotating brush 7 as the impeller 11 rotates. 15 is a dust suction passage 5 formed by a partition wall 9.
A generator consisting of a DC motor located outside is connected to the other end of the shaft 12 and generates electricity by rotating the impeller 11. Reference numeral 16 is an indicator lamp provided on the upper surface of the suction port main body 1, which indicates whether or not the state is suitable for cleaning the bathtub.

FIG. 4 is an electrical circuit diagram of the above-mentioned suction port, and 17
is a capacitor connected across the generator 15, 1
8 is a resistor connected between both ends of the generator 15; 19 is a Zener diode connected between both ends of the generator 15 forming a series circuit with the resistor 20; and 21 is a collector connected to one end of the generator 15 via the resistor 22. The emitter is connected to the other end of the generator 15 through the display lamp 16, and the base is connected to the Zener diode 19 and the resistor 20.
These are transistors connected between the two. The potential at point a is set to be higher than the reference voltage of the Zener diode 19 when the rotation speed of the rotating brush 7 is suitable for cleaning the carpet. That is, a capacitor 17, a resistor 18, a Zener diode 19, a resistor 20, and a transistor 21.
constitutes a rotation detection means for detecting the rotation state of the rotating brush 7 by comparing the voltage generated by the generator 15 with a reference voltage.

Next, its operation will be explained. Now, when the vacuum cleaner starts operating, the suction air flow by the fan inside the vacuum cleaner body is sucked into the vacuum cleaner body through the dust suction opening 3, the dust suction passage 5, the suction pipe 4, and the extension pipe and hose (not shown). This causes the impeller 11 to rotate due to the airflow. Then,
As the impeller 11 rotates, the rotating brush 7 rotates and the generator 15 generates electricity, and the generated voltage is applied between points a and b.

Therefore, if the filter is not clogged and exhibits strong dust suction power, and the rotation speed of the rotating brush 7 is at a rotation speed suitable for carpet cleaning, the potential at point a will be higher than the reference voltage of the Zener diode 19. and
The potential at point c is also high, turning on the transistor 21, thereby turning on the indicator lamp 16. By lighting the indicator lamp 16, the user determines that the condition is suitable for cleaning the carpet.

From this state, the amount of collected dust and the clogging of the filter increase, and the dust suction power gradually weakens, and the rotational speed of the rotating brush 7 decreases to a point that is not suitable for cleaning the carpet, or the impeller 11, for example, When the rotational speed of the rotating brush 7 decreases to a point where it is not suitable for carpet cleaning due to being locked by a foreign object such as a stick or entangled with lint, the potential at point a becomes lower than the reference voltage of the Zener diode 19 and reaches point c. The potential becomes negative, which turns off the transistor 21 and turns off the indicator lamp 16. When the indicator lamp 16 goes out, the user determines that the state is unsuitable for cleaning the carpet.

By arranging the indicator lamp 16 at the suction port, which is always visible during cleaning, the user can easily determine whether cleaning the carpet is suitable or not, even during cleaning.

FIG. 5 shows another embodiment of the present invention, in which an indicator lamp is turned on when the condition becomes unsuitable for cleaning, thereby eliminating problems with the life of the indicator lamp. In FIG. 5, 23 connects the collector to resistor 2.
4, the base of which is connected to one end of the generator 15, and the collector of the transistor 21, respectively, and an indicator lamp 16 is inserted between the emitter of this transistor 23 and the other end of the generator 15. The lamp 16 is turned off when the condition is suitable for cleaning the carpet, and turned on when the condition is not suitable.

(Effects of the Invention) As described above, according to the present invention, not only when the dust suction power decreases due to clogging of the filter, but also when the rotation speed decreases due to the impeller being locked by foreign matter or entangled with lint etc. , it is possible to determine that the condition is unsuitable for cleaning the bathtub and display it with an indicator lamp.This prevents the cleaning of the bathtub from being continued in an inefficient condition, and ensures that the bathtub is always cleaned efficiently. Furthermore, by glancing at the status of the indicator lamp, it is possible to easily and accurately recognize whether or not the carpet is in a suitable condition for cleaning, making it extremely excellent in practical use.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway top view showing one embodiment of the inventive suction port, FIG. 2 is a cross-sectional view taken along line A-A in FIG.
The drawings are a sectional view taken along the line BB in FIG. 1, FIG. 4 is an electric circuit diagram of the same as the above, and FIG. 5 is an electric circuit diagram of another embodiment of the suction port of the present invention. 7: Rotating brush, 11: Impeller, 15: Generator, 16: Display lamp.

Claims (1)

[Claims] 1. A rotary brush located inside the suction port body and protruding outward from the dust suction opening at the bottom of the main body, and an impeller located in the dust suction passage connected to the dust suction opening and rotated by the suction air flow, In a device in which a transmission means is interposed between a rotating brush and an impeller to rotate the rotating brush as the impeller rotates, a generator is provided that generates electricity according to the rotation of the impeller, and the generator generates electricity. A rotation detecting means is provided to detect the rotational state of the rotating brush by comparing the voltage with a reference voltage, and when the voltage generated by the generator is controlled by this rotation detecting means and falls below the reference voltage, the light is turned off or turned off. A vacuum cleaner suction port characterized by being equipped with an indicator lamp that switches to a lit state.