JPH06254014A - Bottom nozzle of vacuum cleaner - Google Patents

Abstract

PURPOSE:To improve the dust collection performance by preventing the deterioration of the dust collection performance caused by a drop of the speed of revolution of a rotary brush at the time when the number of revolutions of an air turbine drops. CONSTITUTION:In a bottom nozzle 32 provided with a rotary brush 38, an air turbine 39 and a motor 40 are provided as driving sources of the rotary brush 38, and a means for switching an operation of the motor is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floor nozzle for an electric vacuum cleaner having a rotating brush effective for cleaning carpets and the like.

[0002]

2. Description of the Related Art Conventionally, floor nozzles for electric vacuum cleaners of this type have been disclosed in JP-A-63-59922 and JP-A-63-63.
As shown in Japanese Patent Publication No. 421, etc., the configuration shown in FIG.

The reference numeral 1 designates an air turbine 2 which is rotated by the suction force of an electric blower (not shown) disposed in the main body of the electric vacuum cleaner, and a rotary brush 3 which scavenges the dust in the carpet, in the suction chamber 4. A floor nozzle provided with a belt 5 for transmitting the driving force of the air turbine 2 to the rotating brush 3. Further, the turbine chamber 6 in which the air turbine 2 is arranged
On the wall 7 separating the suction port 4 from the turbine chamber 6 and the suction port 4
And a communication port 8 for communicating with
A lid 9 for closing the above is provided, and a lever 10 connected to this lid 9 for opening and closing the communication port 8 is provided. When the surface to be cleaned is a carpet by switching the lever 10, the communication port 8 is opened and the air turbine 2 is rotated by the suction force of the electric blower.
It is transmitted to the rotary brush 3 through the rotary brush 3 to rotate the rotary brush 3 to scrape up the dust inside the carpet and suck it in. In the case of a floor or tatami mat, the communication port 8 is closed and the air tabin 2 is closed. The dust is sucked while the rotation of the rotary brush 3 is stopped at the same time as the rotation is stopped.

[0004]

However, in such a conventional structure, when the carpet is used on a carpet having a long bristle, the rotation of the rotary brush 3 cannot be sufficiently obtained due to the resistance of the carpet, so that the dust in the carpet can be reliably removed. I can't scrape it up. Further, when dust is accumulated in the dust collecting chamber of the vacuum cleaner body, the amount of air for rotating the air turbine 2 is reduced, so that the rotation speed of the rotating brush 3 is reduced and the force for scraping the dust in the carpet is reduced. Is weakened and the dust collection efficiency is reduced.

As described above, in the conventional structure, the number of revolutions of the rotary brush 3 for scraping up the dust in the carpet easily changes depending on various conditions such as the type of the carpet and the strength of the suction force. There were many cases where they did.

The present invention solves such a problem, and the number of rotations of the rotary brush 3 during use can be set so as to always be a certain value or more, so that the dust collection performance is significantly lowered. It is an object of the present invention to provide a floor nozzle of an electric vacuum cleaner which is intended to prevent the above.

[0007]

The technical means of the first invention for solving the above-mentioned problems includes a suction chamber containing a rotating brush, an air turbine for supplying a driving force to the rotating brush, and an electric motor. It is provided with a turbine chamber and an electric motor chamber that are provided, and a transmission unit that transmits the driving force to the rotating brush, and constitutes a unit that selectively switches the operation of the electric motor.

The means of the second invention has a means for detecting the amount of air flowing into the turbine chamber when the air turbine is rotating, and the air amount detecting means selectively switches the operation of the electric motor.

The means of the third aspect of the invention comprises means for alternately switching the operation of the electric motor at regular intervals.

The means of the fourth invention has means for detecting the number of revolutions of the air turbine or the rotating brush, and the operation of the electric motor is selectively switched by this number of revolutions detecting means.

The means of the fifth invention comprises means for detecting the rotational speed of the air turbine and means for detecting the pressure in the intake passage, and the rotation speed detecting means and the pressure detecting means select the rotation of the electric motor. It will be switched to.

According to a sixth aspect of the present invention, there is provided a detecting means for detecting the number of revolutions of an air turbine or a rotating brush, and a configuration for controlling the rotation of an electric blower built in the main body of the electric vacuum cleaner by the number of revolutions detecting means. Is to be set up.

According to a seventh aspect of the invention, a magnet is arranged on the rotating shaft as a means for detecting the number of rotations of the air turbine or the rotating brush.

The means of the eighth invention is a means for detecting the number of revolutions of the air turbine or the rotary brush, and is for sensing and determining the electromotive force of the electric motor.

According to a ninth aspect of the present invention, means for detecting the amount of dust in the intake passage is provided, and the operation of the electric motor is selectively switched by the dust amount detection means.

The means of the tenth aspect of the invention has means for detecting the rotational speed of the air turbine or the rotary brush, and means for controlling the electromotive force of the electric motor by the rotational speed detecting means.

According to the eleventh aspect of the invention, the rotation direction of the rotary brush driven by the air turbine and the rotation direction of the rotary brush driven by the electric motor are set to opposite directions.

[0018]

The operation of the above configuration is as follows.

According to the first aspect of the present invention, the air turbine and the electric motor are provided as the driving source of the rotary brush, and the means for selectively switching the operation of the electric motor is provided, so that the surface to be cleaned becomes dirty. When the rotation speed of the air turbine decreases or the rotation speed of the air turbine decreases, the driving force of the electric motor is also added to amplify the rotation of the rotating brush and dust inside the rug can be reliably cleaned, improving the dust collection performance and improving the air turbine and electric motor. Since the rotating brush is rotated by the driving force, a sufficient rotating speed of the rotating brush can be obtained even if the output of the electric motor is reduced, and the electric motor can be miniaturized and the labor can be saved. In addition, power is usually saved by rotating a rotating brush with an air turbine.

According to the second aspect of the present invention, the air turbine is rotated by having a means for detecting the amount of air flowing into the turbine chamber when the air turbine is rotating, and having a structure for selectively switching the operation of the electric motor by the air amount detecting means. By detecting a decrease in the amount of air flow to be caused, the operation of the electric motor is automatically turned on, a driving force is applied to the rotary brush, and the decrease in rotation of the rotary brush due to the air turbine is compensated for, thereby preventing deterioration in dust collection performance.

According to the third aspect of the present invention, the means for alternately switching the operation of the air turbine and the operation of the electric motor at regular intervals is provided, so that dust or foreign matter that has caused a large decrease in the air volume has been sucked in. This prevents the rotating brush from locking and damaging the electric motor.

According to the fourth aspect of the present invention, there is provided means for detecting the number of revolutions of the air turbine or the rotary brush, and the operation of the electric motor is selectively switched by the means for detecting the number of revolutions. Even if the amount of wind that rotates the turbine does not decrease, the resistance of the carpet lowers the rotation speed of the air turbine or rotating brush, but at this time, when the rotation speed of the air turbine or rotating brush decreases, the electric motor is automatically The operation is turned on and the driving force of the electric motor and the air turbine compensates for the decrease in the rotational speed of the rotating brush to prevent the deterioration of the dust collection performance. Further, when the rotation of the rotating brush returns to the normal number of rotations, the electric motor is automatically turned off, and the rotating brush is rotated only by the driving force of the air turbine to reduce the power consumption.

According to the fifth aspect of the present invention, it is provided with a means for detecting the rotational speed of the air turbine and a means for detecting the pressure in the intake passage. The rotational speed detecting means and the pressure detecting means selectively operate the electric motor. By switching to, when the rotation speed of the rotating brush decreases due to the resistance of the carpet etc., the rotation speed detection means turns on the operation of the electric motor, and when the pressure drops due to dust accumulated in the dust collection chamber, etc. The operation of the electric motor can be turned on by the pressure detection means, and the rotation of the rotary brush can always be maintained at a certain level or more, and the power consumption can be reduced without lowering the dust collection performance.

According to the sixth aspect of the present invention, the detecting means for detecting the rotational speed of the air turbine or the rotating brush, and the rotational speed detecting means for controlling the rotation of the electric blower built in the main body of the electric vacuum cleaner are provided. By doing so, when the rotation of the air turbine or the rotating brush decreases, the rotation of the electric blower is automatically increased to increase the suction force and the rotation speed of the air turbine and the rotating brush also increase, improving dust collection performance. Is. Also, when the rotation of the air turbine or rotating brush exceeds a certain level, the rotation of the electric blower is automatically reduced to reduce the suction force, and the number of rotations of the air turbine or rotating brush is reduced to reduce noise. It is a thing.

According to the seventh invention, by disposing a magnet on the rotating shaft as means for detecting the number of rotations of the air turbine or the rotating brush, a change in the magnetic field due to the rotation of the magnet as the shaft rotates can be prevented. It is possible to easily provide a small and light rotation speed detection means by detecting the rotation speed.

According to the eighth aspect of the present invention, as a means for detecting the rotational speed of the air turbine or the rotary brush, the electromotive force of the electric motor is sensed and the change thereof is discriminated, whereby the rotational speed of the electric motor provided for driving is determined. Since it can also serve as the detection means, it can be constructed at low cost and can be made compact and lightweight without using a separate component.

According to the ninth aspect of the invention, a means for detecting the amount of dust in the intake passage is provided, and the operation of the electric motor is selectively switched by the dust amount detecting means, so that the amount of dust in the intake passage is large. Occasionally, the rotation of the electric motor is turned on to increase the number of rotations of the rotating brush, and the dust in the rug is firmly scraped out to improve the dust collection performance. On the contrary, when the amount of dust in the intake passage is small, the rotation of the electric motor is turned off and the rotating brush is rotated only by the air turbine to suck the dust efficiently, labor-savingly and reliably.

According to the tenth aspect of the present invention, there is provided means for detecting the rotational speed of the air turbine or the rotary brush, and by providing means for controlling the electromotive force of the electric motor by the rotational speed detecting means, the rotational speed can be reduced. When it exceeds a certain level, the electric motor is operated as a generator to control the generated electric power and change it to a load to reduce the rotation of the rotating brush,
It is intended to reduce noise.

According to the eleventh aspect of the invention, the rotation direction of the rotary brush driven by the air turbine and the rotation direction of the rotary brush driven by the electric motor are set to opposite directions, and the operation of the electric motor is switched on and off at regular intervals. By doing so, the rotating brush rotates in the opposite direction when the electric motor is turned on and off, and the carpet bristles can be raked up from both sides, resulting in a significant improvement in dust collection performance.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1 and FIG. 2, reference numeral 21 denotes a dust collecting chamber 22 having an upward opening on the front side, and a motor 23 for sucking dust, a cord winding device 25 around which a power cord 24 is wound, and the like on the rear side. In the built-in vacuum cleaner main body (hereinafter referred to as the main body), a paper bag 26 accumulating dust is detachably attached to the dust collection chamber 22, and a lid 27 is provided so as to cover the upper opening thereof.
Is rotatably arranged on the main body 21. An intake port 30 to which a connection pipe 29 of a hose 28 is attached is formed in a lid 27 in front of the main body 21, a handle 31 is formed at the tip of the hose 28, and a floor nozzle 32 is a floor nozzle pipe 33. And the extension pipes 34A and 34B. The main body 21 has a caster 35 for moving on the lower surface.
And the rollers 36 are arranged on the side surfaces. Also,
The suction chamber 37 of the floor nozzle 33 is provided with a rotary brush 38 for scraping out dust that has entered the rug, and an air turbine 39 and an electric motor 40 for giving a driving force to the rotary brush 38 are provided in a turbine chamber 41 and an electric motor chamber 42, respectively. The air turbine 39 and the electric motor 40 are arranged and connected to the rotating brush 38 via a belt A43 and a belt B44. The turbine chamber 41 is communicated with the suction chamber 37 through a communication port 46 formed in the wall 45, and the switching lever 4
The communication plate 46 can be opened and closed by a shield plate 48 connected to the communication port 7. Further, a ventilation port 49 communicating with the floor nozzle pipe 33 is provided on the wall 45 on the floor nozzle pipe 33 side of the communication port 46, and is similarly opened and closed by a shielding plate 48. An opening 48 ′ is formed in the shielding plate 48 so that the ventilation port 49 opens when the communication port 46 is shielded. Reference numeral 50 denotes a limit switch disposed in the electric motor room 42 for switching the operation of the electric motor 40 between on and off. Normally, it is in an off state, but when the switching lever 47 is positioned to the left. It contacts the lever 50 'of the limit switch 50 to turn on the operation of the electric motor.

The operation of the above configuration is as follows. Switching lever 4 when the surface to be cleaned is the floor or tatami mat
7 is operated to shield the communication port 46 by the shielding plate 48, and the rotary brush 38 is not rotated and air is sucked from the ventilation port 49. When the surface to be cleaned is a carpet, the switching lever 47 is operated to open the communication port 46 and intake air to the air turbine 3
9 is rotated, the driving force is transmitted to the rotary brush 38 via the belt A43, and the rotary brush 38 is rotated to scrape up and inhale the dust accumulated in the carpet. Further, when the carpet has long bristles, the rotation of the rotary brush 38 is reduced due to its resistance, or when the suction force is reduced and the rotation of the air turbine 39, that is, the rotation of the rotary brush 38 is reduced, a force sufficient to raise the carpet is obtained. In this case, the ventilation plate 49 is closed by the shielding plate 48, the communication port 46 is opened, and the air turbine 39 is rotated to operate the switching lever 47 to contact the lever 50 ′. Then, by turning on the limit switch 50, the operation of the electric motor 40 is turned on to turn on the air turbine 3 via the belt B44.
The rotating brush 38 is rotated together with the driving force of 9.

According to the second aspect of the invention, as shown in FIGS. 3 and 4, the air volume detecting means 51 for detecting the air volume flowing into the turbine chamber 41 is provided, and the air volume detecting means 51 is a constant air volume. The switch 52 is arranged so that the operation of the electric motor 40 is turned on when it becomes. The relationship between the number of revolutions of the rotating brush 38 by the air turbine 39 and the air volume at this time is shown in FIG. 5. If the air volume decreases, the air turbine 39
Therefore, the rotation speed of the rotating brush 38 also decreases. Therefore, when the air flow rate becomes a certain level or less, the electric motor 40 is automatically rotated to rotate the rotating brush 38 together with the driving force of the air turbine 39, and the air volume is reduced, and the dust collection performance is deteriorated due to the insufficient rotational force of the air turbine 39. To prevent.

According to the third aspect of the invention, as shown in FIG. 6, the air volume detecting means 51 for detecting the air volume flowing into the turbine chamber 41 is provided, and the air volume detecting means 51 has a constant air volume. The means 5 is configured to turn on the operation of the electric motor 40 at the same time, and means 5 for switching the operation of the electric motor 40 on and off at a constant time interval for several cycles after the operation of the electric motor 40 is turned on by the air volume detection means 51.
3 are arranged. Thus, for example, when a large amount of dust is sucked into the suction chamber 37 of the floor nozzle 32, the air volume decreases, so that the air volume detection unit 51 immediately turns on the electric motor 40 to operate the electric motor 40.
Instead of operating the electric motor 40 all the time, the electric motor 40
By repeating the operation of ON and OFF for several cycles,
It is possible to detect whether the decrease in air volume is caused by the accumulation of dust in the dust collection chamber 22 or another abnormal state, which saves unnecessary power consumption and locks the rotary brush 38 with large dust, so that the electric motor 40 is operated. It is intended to prevent damage.

According to the fourth aspect of the invention, as shown in FIGS. 7 and 8, the rotation speed detecting means 54 for detecting the rotation speed of the air turbine 39 is arranged in the turbine chamber 41, whereby the air turbine 39 is provided. The electric motor 40 is configured to be turned on when the rotational speed reaches a certain rotational speed. The rotation speed of the air turbine 39 does not decrease only when the air volume decreases, but changes due to the difference in resistance given to the rotating brush 38 due to the length of the carpet bristles, for example. Even so, the rotation of the rotary brush 38 may decrease. Therefore, by detecting the change in the number of rotations of the rotating brush 38, it is possible to prevent the number of rotations of the rotating brush 38 from decreasing due to the kind of rug, the accumulation of dust in the dust collecting chamber 22, and the like. This is to prevent the decrease.

According to the fifth aspect of the invention, as shown in FIGS. 9 and 10, the rotation speed detecting means 54 for detecting the rotation speed of the air turbine 39 is provided in the turbine chamber 41 and the pressure in the intake passage is controlled. A pressure detecting means 55 for detecting is provided, the rotational speed detecting means 54 and the pressure detecting means 55 are connected in parallel, and the operation of the electric motor 40 is turned on regardless of which detecting means operates. As a result, when the dust collects in the dust collection chamber 22 or the pressure changes due to the difference in the adhesion between the floor nozzle 32 and the surface to be cleaned or the difference in the pressing force, the pressure detection means 55 operates and the air volume decreases. When some resistance is applied to the rotating brush 38 and the number of rotations decreases, the number-of-rotations detecting means 54 operates, the operation of the electric motor 40 is turned on in any case, and the number of rotations of the rotating brush 38 is kept above a certain level. It can be maintained and prevents deterioration of dust collection performance.

According to the sixth aspect of the invention, as shown in FIG. 11, the rotation speed detecting means 54 for detecting the rotation speed of the air turbine 39 and the electric blower 23 built in the main body 21 by the rotation speed detecting means 54. A control means 56 for controlling rotation is provided. As a result, when the rotation speed of the air turbine 39 decreases, the control means 56 operates to increase the rotation of the electric blower 23, thereby increasing the suction force and the rotation speed of the rotary brush 38 due to the increase in the air volume. By raising it, the dust collection performance is improved. On the contrary, when the rotational speed of the air turbine 39 is above a certain level, the control means 56 operates to lower the rotational speed of the electric blower 23, thereby reducing the air volume and lowering the rotational speed of the rotary brush, thereby saving power and noise. Is intended. In particular, when the floor nozzle 32 is lifted, the rotating brush 38 rotates in an unloaded state, so that the rotating speed of the electric blower 23 is lowered because the rotation speed becomes considerably high and the noise value increases due to the wind noise of the air turbine 39. With this, the number of rotations of the air turbine 39 is suppressed and low noise is achieved.

According to the seventh aspect of the invention, as shown in FIG. 12, the rotating shaft 39 'of the air turbine 39 is provided with the magnet 57 and the magnetic field sensing device 58.
At the same time, the magnet 57 rotates to change the magnetic field, and the change in the magnetic field can be detected by the magnetic field sensing device 58 as the rotational speed of the air turbine 39.

According to the eighth invention, the air turbine 39
When rotating the rotary brush 38 with only the electric motor 4
0 is rotated by the belt B44. Electric motor 4 at this time
The number of revolutions is detected by the change in electromotive current generated by the rotation of 0, and the electric motor 40 for driving can also serve as the number of revolutions detecting means 54, and it is not necessary to use a separate component.

According to the ninth aspect of the invention, as shown in FIGS. 13 and 14, the light emitting element 59 and the light receiving element 60 are relatively arranged so as to face the inside of the intake passage of the handle 31.
A dust amount detecting means 61 for detecting the change in the amount of light from the light receiving element 60 to the light receiving element 60 to detect the amount of dust in the intake passage is provided. Further, a switching device 62 for turning on / off the operation of the electric motor 40 in response to a signal from the dust amount detecting means 61 is provided. When the amount of dust in the intake passage is large by the dust amount detection means 61, the operation of the electric motor 40 is turned on, and when the amount of dust is small, the operation of the electric motor 40 is turned off and the rotary brush 38 is rotated by driving the air turbine 39. It is a thing. Therefore, the operation of the electric motor 40 and the air turbine 39 is automatically switched according to the amount of dust on the surface to be cleaned, power saving and dust collection performance can be improved, and effective cleaning according to the amount of dust can be performed. .

According to the tenth aspect of the invention, as shown in FIG. 15, the rotation speed detecting means 54 for detecting the rotation speed of the air turbine 39 or the rotating brush 38 and the rotation speed detecting means 5 are provided.
By providing the electromotive force control means 63 for controlling the electromotive force of the electric motor 40 by the signal from the rotary brush 38,
When the number of revolutions of the electric motor 40 exceeds a certain value, the electric motor 40 is made to act as a generator, and the electric power generated by this electric power generation operation is consumed by the electromotive force control means 63 to generate the electric motor 40.
Is used as a load to reduce the rotation speed of the rotating brush 38,
It is intended to reduce noise. In particular, when the floor nozzle 32 is lifted, the rotating brush 38 rotates in an unloaded state, so that the rotation speed is considerably high and the noise value increases due to the wind noise of the air turbine 39, and the rotation speed of the rotating brush 38 is suppressed. , Low noise.

According to the eleventh aspect of the invention, as shown in FIG. 16, the rotating direction of the rotating brush 38 driven by the air turbine 39 and the rotating direction of the rotating brush 38 driven by the electric motor 40 are set to be opposite to each other. A timer device 64 for turning on and off the operation of the above is set at regular intervals. As a result, the electric motor 40 is regularly operated and the rotating brush 38 repeats normal rotation and reverse rotation, and the bristles of the carpet are raked up from both sides, so that the dust collection performance can be remarkably improved. Further, since the electric motor 40 only needs to rotate in one direction and it is not necessary to switch the rotational direction of the electric motor 40 as in the conventional case, the electric motor 40 can be downsized, its life can be improved, and the cost can be reduced.

[0043]

As described above, the present invention obtains the following great effects.

According to the first aspect of the present invention, an air turbine and an electric motor are provided as driving sources for the rotating brush, and the operation of the electric motor is selectively switched between on and off to rotate the air turbine due to a reduction in suction force. When the air volume is insufficient, the operation of the electric motor is switched to compensate for the decrease in the driving force of the air turbine by using the driving force of the electric motor as an auxiliary force, and the rotation speed of the rotating brush can be increased to raise the dust inside the carpet firmly. It is possible to prevent the deterioration of the dust collection performance. In addition, since the electric motor is installed to compensate for the decrease in the rotational speed of the air turbine, even if the output of the electric motor is small, a sufficient rotational speed of the rotating brush can be obtained, and the size and weight of the electric motor can be reduced and the air By operating the electric motor when the rotation speed of the turbine is high, the rotation speed of the rotating brush is further increased, and the dust collection performance is further improved. Furthermore, the rotary brush is usually rotated by driving only the air turbine, and power can be saved. Also, by installing an electric motor on the opposite side of the floor nozzle from which the air turbine is installed, the left and right weights of the floor nozzle are balanced, and the floor nozzle does not tilt when lifted, improving usability. It goes without saying that you can achieve this. Furthermore, if a handle is equipped with a changeover switch that turns the electric motor on and off,
Needless to say, the user can arbitrarily switch between labor-saving cleaning by driving the rotating brush of only the air turbine and firm cleaning by driving the rotating brush of the electric motor and the air turbine to improve usability.

According to the second aspect of the present invention, the air amount detecting means for detecting the amount of air flowing into the turbine chamber is provided, and the air amount detecting means selectively switches the operation of the electric motor on and off to collect dust. The electric motor is automatically operated when a large amount of dust is accumulated in the room and the suction force, that is, the air volume decreases.The air turbine driving force is insufficient. Even when doing so, the dust inside the carpet can be reliably scraped up to improve the dust collection performance.

According to the third aspect of the present invention, the operation of the air turbine and the electric motor is alternately switched at regular intervals for several cycles after the operation of the electric motor is started. It is possible to detect whether it has occurred due to an abnormal condition or another abnormal condition, prevent malfunction, reduce unnecessary power consumption, and prevent the rotating brush from being locked by a large dust and damaging the electric motor.

According to the fourth aspect of the invention, the number of revolutions detecting means for detecting the number of revolutions of the air turbine or the rotary brush is provided, and the operation of the electric motor is selectively switched by the number of revolutions detecting means, whereby the carpet It is possible to accurately detect a decrease in the rotation speed of the rotating brush due to a decrease in the type or the air volume, and at this time, the electric motor is turned on to increase the rotation speed of the rotating brush to further improve the dust collection performance.

According to the fifth aspect of the invention, the rotation speed detecting means and the pressure detecting means for detecting the pressure in the intake passage are provided, and the operation of the electric motor is selectively switched regardless of which detecting means operates. With this configuration, when the rotation speed of the rotating brush decreases due to the resistance of the carpet, the rotation speed detection means turns on the operation of the electric motor, dust is accumulated in the dust collection chamber, and the pressing force of the floor nozzle on the carpet is reduced. When the pressure drops due to a difference, the electric motor is turned on, and in any case, the electric motor is driven to compensate for the decrease in the driving force of the air turbine. Performance is not impaired,
Labor saving can also be achieved.

According to the sixth aspect of the present invention, the rotation speed detection means and the structure for controlling the rotation of the electric blower in association with the rotation speed detection means increase the rotation of the electric blower when the rotation speed of the rotating brush decreases. The suction force is increased and the rotation of the rotary brush is increased, so that the dust collection performance can be improved. On the other hand, when the rotation speed of the rotating brush is high, the rotation of the electric blower is lowered to reduce the noise of the main body and the suction force is reduced, and the rotation speed of the air turbine decreases due to the wind noise in the suction chamber and the rotation speed of the air turbine. The wind noise at the time of rotation can be reduced, and a large noise reduction can be achieved. In particular, when the floor nozzle is lifted, the rotating brush rotates in a no-load state, so the rotation speed is considerably high, and the noise level rises due to the wind noise of the air turbine, making it noisy by lowering the rotation of the electric blower. It is effective for suppressing the number of rotations and reducing noise.

According to the seventh aspect of the present invention, by disposing a magnet on the rotating shaft as means for detecting the number of rotations of the air turbine or the rotating brush, the change of the magnetic field due to the rotation of the magnet with the rotation of the shaft is prevented. It is possible to easily provide a small and light rotation speed detection means by detecting the rotation speed.

According to the eighth aspect of the present invention, as a means for detecting the rotational speed of the air turbine or the rotating brush, the electromotive force of the electric motor is sensed and its change is discriminated, whereby the rotational speed of the electric motor provided for driving is changed. Since it can also serve as the detection means, it can be constructed at low cost and can be made compact and lightweight without using a separate component.

According to the ninth aspect of the invention, the dust amount detecting means for detecting the dust amount in the intake passage is provided, and the operation of the electric motor is selectively switched by the dust amount detecting means, whereby the electric motor is operated when the dust amount is large. By rotating the rotating brush, the dust inside the rug can be reliably scratched up to improve the dust collection performance, and when the amount of dust is small, the rotating brush can be rotated by the air turbine to save electricity and perform efficient and labor-saving cleaning. Is.

According to the tenth aspect of the present invention, by providing means for detecting the rotational speed of the air turbine or the electric motor and means for controlling the electromotive force of the electric motor by the rotational speed detecting means, the rotational speed of the rotating brush is constant. When it becomes the above, it acts as a generator and the electric power generated by this power generation is consumed by the electromotive force control means to use the rotation of the electric motor as a load against the rotation of the rotating brush, thereby lowering the rotation speed of the rotating brush and reducing it. It is intended to make noise. It is especially effective in reducing noise when the floor nozzle is floated in the air.

According to the eleventh aspect of the invention, the rotation direction of the rotary brush driven by the air turbine and the rotation direction of the rotary brush driven by the electric motor are set to opposite directions, and the operation of the electric motor is switched on and off at regular intervals. By providing the switching device, the rotating brush repeats forward and reverse rotations, and the bristles of the carpet are scraped from both sides, so that the dust collection performance can be significantly improved. Furthermore, since the electric motor only needs to rotate in one direction and it is not necessary to switch the electric motor's rotational direction as in the conventional case, the electric motor can be downsized, its life can be improved, and its cost can be reduced.

As described above, the present invention obtains an extremely effective effect in practical use.

[Brief description of drawings]

FIG. 1 is a side view of a vacuum cleaner in a use state showing an embodiment of a first invention.

FIG. 2 is an internal configuration diagram of a floor nozzle showing an embodiment of the first invention.

FIG. 3 is an internal configuration diagram of a floor nozzle showing an embodiment of the second invention.

FIG. 4 is a circuit diagram showing an embodiment of the second invention.

[Fig. 5] Correlation graph between the rotational speed of the rotating brush and the air volume

FIG. 6 is an internal configuration diagram of a floor nozzle showing an embodiment of the third invention.

FIG. 7 is an internal configuration diagram of a floor nozzle showing an embodiment of the fourth invention.

FIG. 8 is a circuit diagram showing an embodiment of the fourth invention.

FIG. 9 is an internal configuration diagram of a floor nozzle showing an embodiment of the fifth invention.

FIG. 10 is a circuit diagram showing an embodiment of the fifth invention.

FIG. 11 is a circuit diagram showing an embodiment of the sixth invention.

FIG. 12 is an internal configuration diagram of a floor nozzle showing an embodiment of the seventh invention.

FIG. 13 is a partial sectional view of a handle showing an embodiment of the ninth invention.

FIG. 14 is a circuit diagram showing an embodiment of the ninth invention.

FIG. 15 is an internal configuration diagram of a floor nozzle showing an embodiment of the tenth invention.

FIG. 16 is an internal configuration diagram of a floor nozzle showing an embodiment of the eleventh invention.

FIG. 17 is an internal configuration diagram of a floor nozzle showing a conventional example.

[Explanation of symbols]

 32 Floor Nozzle 38 Rotating Brush 39 Air Turbine 40 Electric Motor 41 Turbine Room 42 Electric Motor Room 45 Wall 46 Communication Port 47 Switching Lever 48 Shielding Plate 48 'Opening 49 Vent 50 Limit Switch 50' Lever 51 Air Flow Detection Means 52 Switch 53 Switching Means 54 rotation speed detection means 55 pressure detection means 56 control means 57 magnet 58 magnetic field detection device 61 dust amount detection means 62 switching device 63 electromotive force control means 64 timer device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masakuni Soejima 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor, Masakazu Onda 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (13)

[Claims] 1. A suction chamber containing a rotating brush, a turbine chamber in which an air turbine for giving a driving force to the rotating brush and an electric motor are respectively disposed, an electric motor chamber, and a transmitting means for transmitting the driving force to the rotating brush. A floor nozzle for an electric vacuum cleaner, comprising means for selectively switching the operation of the electric motor. 2. A floor of an electric vacuum cleaner according to claim 1, further comprising means for detecting the amount of air flowing into the turbine chamber when the air turbine is rotating, and the operation of the electric motor is selectively switched by the air amount detecting means. nozzle. 3. A floor nozzle for an electric vacuum cleaner according to claim 2, further comprising means for alternately switching the operation of the electric motor at certain intervals. 4. A floor nozzle for an electric vacuum cleaner according to claim 1, wherein an electric motor is arranged on the side of the floor nozzle opposite to the side on which the air turbine is arranged. 5. The floor of the electric vacuum cleaner according to claim 1, further comprising means for detecting the number of revolutions of the air turbine or the rotating brush, and the operation of the electric motor is selectively switched by the number of revolutions detecting means. nozzle. 6. An air turbine or a rotating brush is provided with a means for detecting the number of revolutions and a means for detecting the pressure in the intake passage, and the operation of the electric motor is selectively switched by the number of revolutions detecting means and the pressure detecting means. The floor nozzle for an electric vacuum cleaner according to claim 1, wherein: 7. A detection means for detecting the rotation speed of an air turbine or a rotating brush, and the rotation speed detection means,
A floor nozzle for an electric vacuum cleaner, comprising means for controlling rotation of an electric blower built into the electric vacuum cleaner body. 8. A floor nozzle for an electric vacuum cleaner according to claim 5, wherein a magnet is arranged on a rotating shaft as means for detecting the number of rotations of the air turbine or the rotating brush. 9. A floor nozzle for an electric vacuum cleaner according to claim 5, wherein the means for detecting the number of revolutions of the air turbine or the rotary brush is to detect the electromotive force of an electric motor for discrimination. 10. A floor nozzle for an electric vacuum cleaner according to claim 1, further comprising means for detecting the amount of dust in the intake passage, and the operation of the electric motor is selectively switched by the dust amount detecting means. 11. A floor nozzle for an electric vacuum cleaner according to claim 1, wherein the operation of the electric motor is selectively switched by a changeover switch arranged on a handle portion which is gripped and operated by a user. 12. The electric machine according to claim 1, further comprising means for detecting the rotational speed of the air turbine or the rotating brush, and means for controlling the electromotive force of the electric motor by the rotational speed detecting means. Floor nozzle for vacuum cleaner. 13. A means for setting the rotation direction of a rotary brush driven by an air turbine and the rotation direction of a rotary brush driven by an electric motor in opposite directions, and arranging means for switching the operation of the electric motor at regular intervals. The floor nozzle of the electric vacuum cleaner according to claim 1.