JPH06304094A - Central cleaner - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a central cleaner that is quiet and does not have an unpleasant humming noise. An acceleration frequency conversion means 18 for mounting an acceleration sensor 17 on an inner wall of a motor chamber 11 having two sucking motors 9 and 10 therein and converting an output signal of the acceleration sensor 17 into a frequency. A central control unit that forms a motor drive circuit by a control unit 19 that receives the output signal of the acceleration frequency conversion unit 18 and two motor drive units 20 and 21 that receive the output signal of the control unit 19 and drive the motors 9 and 10. Cleaner.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a central cleaner.

[0002]

2. Description of the Related Art In recent years, electric vacuum cleaners have become more and more powerful and quieter. Particularly in central cleaners, a method of increasing the electric power of a suction motor to make cleaning more effective has become mainstream. .

Conventionally, this type of central cleaner is shown in FIG.
The configuration as shown in is general, and the configuration will be described below with reference to the drawings.

As shown in the drawing, it comprises a first motor 1 for suction, a motor chamber 3 containing a second motor 2, and a dust collecting chamber 5 containing a filter 4 for filtering the sucked dust. The main body 6 is placed outdoors or under stairs, and the intake port 7 side is connected to each room, and the exhaust port 8 is placed outdoors or under the floor of the house so that the exhaust air is emitted.

In the above structure, when the main body 6 is operated, the first motor 1 and the second motor 2 rotate to generate a suction force, and dust contained in the air sucked from the intake port 7 is collected in the filter 4. The collected and filtered air passes through the first motor 1 and the second motor 2 while being cooled,
It is discharged from the exhaust port 8.

[0006]

In such a conventional central cleaner, since the suction motor has been increased in output along with the recent increase in power of electric vacuum cleaners, the motor is rotated at a high speed. With a large air volume and high vacuum pressure, the suction is strong and the sound is loud. Although two identical motors are used, the number of revolutions of each motor is different due to variations in the manufacturing process, so that similar rotational frequencies of the motors produce similar beats, causing the body to vibrate and cause unpleasant humming. It was a sound. For this reason, there is a possibility that it may become a serious problem under the situation of noise reduction in recent years, and the addition of a vibration damping material for vibration damping causes a decrease in performance and an increase in manufacturing cost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a central cleaner which is free of unpleasant humming noise and quiet in sound.

[0008]

The central cleaner of the present invention for achieving the above object has a motor chamber containing two motors for suction and a dust collecting chamber containing a dust bag. The acceleration sensor is attached to the inner wall of the motor chamber, and the acceleration frequency conversion means converts the output signal of the acceleration sensor into a frequency, the control means receives the output signal of the acceleration frequency conversion means, and the output signal of the control means. A motor drive circuit is configured by two motor drive means for driving the receiving motor.
The third means is to provide a resonance plate on the inner wall of the motor and attach an acceleration sensor to the resonance plate. The third means is
A frequency separating means for receiving an output signal of the acceleration frequency converting means and detecting a rotation frequency component of the motor may be provided between the acceleration frequency converting means and the control means, and the fourth means may be the first motor. The first acceleration sensor is attached to the first acceleration sensor, the first acceleration frequency converting means for converting the output signal of the first acceleration sensor into a frequency, and the second acceleration sensor attached to the second motor; A second acceleration frequency converting means for converting the output signal of the second acceleration sensor into a frequency, and a control means for receiving the output signals of the two acceleration frequency converting means.
Means attaches the first pressure sensor near the intake port of the first motor, attaches the second pressure sensor near the intake port of the second motor, and outputs the output signals of the two pressure sensors. And a control means for receiving.

[0009]

In the central cleaner having the above structure, the acceleration frequency conversion means for converting the output signal of the acceleration sensor into a frequency, the control means for receiving the output signal of the acceleration frequency conversion means, and the output of the control means. Since it is composed of two motor driving means for receiving the signal and driving the motor, it is possible to prevent the generation of the humming noise by matching the rotational speeds of the two motors.

In the second means, the resonance plate is provided on the inner wall of the motor chamber, and the acceleration sensor is attached to the resonance plate. Therefore, the amplitude of vibration required for the sensitivity of the acceleration sensor can be sufficiently obtained, and two resonance plates can be obtained. It is possible to easily match the rotation speeds of the motors and prevent the generation of a beating noise.

In the third means, since the frequency separation means for receiving the output signal of the acceleration frequency conversion means and detecting the rotation frequency component of the motor is provided between the acceleration frequency conversion means and the control means, the acceleration sensor Since the rotation frequency component of the motor can be detected in the area with high operation sensitivity of
It is possible to easily match the rotation speeds of the two motors and prevent the occurrence of a beating noise.

According to a fourth means, a first acceleration sensor is attached to the first motor, and a first acceleration frequency converting means for converting an output signal of the first acceleration sensor into a frequency, and a second acceleration frequency converting means. Attach the second acceleration sensor to the motor of
Since the output signal of the second acceleration sensor is converted into a frequency by the second acceleration frequency conversion means, and the control means for receiving the output signals of the two acceleration frequency conversion means is provided, two motors are provided. It is possible to prevent the generation of a beat noise by matching the rotation speeds of the.

In the fifth means, a first pressure sensor is attached near the intake port of the first motor, and a second pressure sensor is attached near the intake port of the second motor. Since the control means for receiving the output signal of the pressure sensor is provided, the rotational speeds of the two motors can be made to coincide with each other, and the generation of a humming noise can be prevented in advance.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 and 2, a motor chamber 1 containing a first motor 9 for suction and a second motor 10 for suction.
1. A main body 14 consisting of a dust collection chamber 13 containing a dust collection bag 12 for filtering sucked dust is placed outdoors or under stairs, and the suction port 15 side is connected to each room and the exhaust port 16 Is installed outdoors or under the floor of the house so that exhaust air can be emitted. An acceleration sensor 17 is attached to the inner wall of the motor chamber 11, an acceleration frequency conversion means 18 for converting the output signal of the acceleration sensor 17 into a frequency, and a control means 19 for receiving the output signal of the acceleration frequency conversion means 18.
A motor drive circuit is constituted by a first motor drive means 20 for driving the first motor 9 and a second motor drive means 21 for driving the second motor 10 in response to the output signal of the control means 19. There is.

In the second embodiment, a resonance plate 22 is provided on the inner wall of the motor chamber 11 and the acceleration sensor 17 is attached to the resonance plate 22.
I am attached.

In the third embodiment, a frequency separating means 23 for receiving an output signal of the acceleration frequency converting means 18 and detecting a rotational frequency component of a motor is provided between the acceleration frequency converting means 18 and the control means 19. There is.

In the fourth embodiment, the first acceleration sensor 24 is attached to the first motor 9 and the output signal of the first acceleration sensor 24 is received to convert it into frequency. 25, and the second acceleration sensor 26 is attached to the second motor 10, and the second acceleration sensor 26
And the second acceleration frequency converting means 27 for converting the output signal of the
The control means 19 receives the output signals of 5 and 27.

In the fifth embodiment, the first pressure sensor 28 is mounted near the intake port of the first motor 9, and the second pressure sensor 29 is mounted near the intake port of the second motor 10. Control means 19 for receiving the output signals of the two pressure sensors
Is equipped with.

In the above structure, when the main body 14 is operated, the first motor 9 and the second motor 10 rotate to generate suction force, and the dust sucked from the suction port 15 is collected in the dust collecting bag 12. The filtered air passes through the first motor 9 and the second motor 10 while being cooled, and is discharged from the exhaust port 16.

In the first embodiment, if the rotation speeds of the first motor 9 and the second motor 10 are different, the vibrations of the two motors interfere with each other, and the frequency difference between the rotation frequencies of the two motors. Vibration occurs. This is the main body 14
Is vibrated to be heard as a humming sound, but the acceleration sensor 17 attached to the inner wall of the motor chamber 11 detects the humming vibration. The output signal of the acceleration sensor 17 is converted into a beat frequency by the acceleration frequency conversion means 18 and input to the control means 19. The control means 19 reduces the rotation speed of the first motor 9 by the first drive means 20 and confirms the input of the control means 19. Here, the control means 1
If the input of 9 is reduced, the rotation speed of the first motor 9 is reduced until the input becomes zero. If the input of the control means 19 has increased, the number of rotations of the first motor 9 is returned to the original value,
The rotation speed of the second motor 10 is reduced by the second drive means 21, and the rotation speed of the second motor 10 is reduced until the input of the control means 19 becomes zero. By this operation, the rotation speeds of the first motor 9 and the second motor 10 match, and the beat noise disappears.

In the second embodiment, the motor chamber 11
When the resonance plate 22 is attached to the inner wall of the motor chamber 11, the resonance plate 22 resonates with the beat vibration, and the vibration of the inner wall of the motor chamber 11 causes the resonance plate 22 to resonate.
Vibration becomes larger, and a larger output signal can be obtained than when the acceleration sensor 17 is attached to the inner wall of the motor chamber 11. Therefore, the substantial sensitivity of the acceleration sensor 17 is increased, even weak vibrations can be detected, the detection accuracy can be improved, and the beat noise can be greatly reduced.

In the third embodiment, when the frequency separating means 23 is provided, the rotational frequency component of the first motor 9 and the rotational frequency component of the second motor 10 are separated and detected,
The difference between the rotation frequencies of the two motors is input to the control means 19. The rotation speed of the motor is approximately 25,000 r / min
Therefore, the rotation frequency is about 400 Hz, and the variation in characteristics due to the manufacturing of the motor is about 10%, so the beat frequency is 40 Hz at the maximum. Since the sensitivity of the acceleration sensor 17 usually tends to decrease at 100 Hz or less, the substantial sensitivity of the acceleration sensor 17 increases when the rotational frequency of the motor having a higher frequency is detected than when the beat vibration itself having a low frequency is detected. become. Therefore, the detection accuracy can be improved, which greatly contributes to the reduction of the humming noise.

In the fourth embodiment, the first acceleration sensor 24 detects the vibration of the first motor 9, and the first acceleration frequency conversion means 25 is used by the first acceleration sensor 24.
Of the output signal of the second acceleration sensor 26, the second acceleration sensor 26 detects the vibration of the second motor 10, and the second acceleration frequency conversion means 27 receives the output signal of the second acceleration sensor 26. And the output signals of the two acceleration frequency conversion means are input to the control means 19. If the frequency of the signal output of the first acceleration frequency conversion means 25 is higher than the frequency of the signal output of the second acceleration frequency conversion means 27, the control means 19 causes the first driving means 20 to control the rotation speed of the first motor 9. Then, the rotation speed of the first motor 9 is decreased until the frequency difference becomes zero. If the frequency of the signal output of the first acceleration frequency conversion means 25 is lower than the frequency of the signal output of the second acceleration frequency conversion means 27, the rotation speed of the second motor 10 is reduced by the second drive means 21, and the frequency is reduced. The number of rotations of the second motor 10 is reduced until the difference of zero becomes zero. By this operation, the rotation speeds of the first motor 9 and the second motor 10 match, and the beat noise disappears. Detecting the rotation frequency of a high-frequency motor will increase the actual sensitivity of the acceleration sensor rather than detecting the low-frequency beat vibration itself, thus improving the detection accuracy and greatly contributing to the reduction of humming noise. To do.

In the fifth embodiment, the first pressure sensor 28 detects the pressure of the first motor 9, the second pressure sensor 29 detects the pressure of the second motor 10, and the two pressure sensors The output signal of the pressure sensor is input to the control means 19.
If the signal output of the first pressure sensor is higher than the signal output of the second pressure sensor, the control means 19 causes the first driving means 20 to decrease the rotation speed of the first motor 9 and the pressure difference becomes zero. The number of rotations of the first motor 9 is reduced up to.
If the signal output of the first pressure sensor is lower than the signal output of the second pressure sensor, the rotation speed of the second motor 10 is reduced by the second drive means 21 until the difference in pressure becomes zero. The rotation speed of the motor 10 is reduced. By this operation, the rotation speeds of the first motor 9 and the second motor 10 match, and the beat noise disappears.

[0026]

As is apparent from the above embodiments, according to the present invention, in the first means, the motor chamber containing the two suction motors and the dust collecting chamber containing the dust collecting bag are provided. An acceleration frequency conversion means for holding an acceleration sensor attached to the inner wall of the motor and converting an output signal of the acceleration sensor into a frequency, a control means for receiving an output signal of the acceleration frequency conversion means, and an output of the control means. Since the motor drive circuit is composed of the two motor drive means for receiving the signal and driving the motor, the rotational speeds of the first motor and the second motor match, and the beat noise disappears.
Therefore, it is possible to provide a central cleaner having a quiet sound without an unpleasant growl noise.

In the second means, since the resonance plate is provided on the inner wall of the motor and the acceleration sensor is attached to the resonance plate, a larger output signal can be obtained than when the acceleration sensor is attached to the inner wall of the motor. The substantial sensitivity is improved, even weak vibrations can be detected, the detection accuracy can be improved, and it greatly contributes to the reduction of humming noise. Therefore, it is possible to provide a central cleaner having a quiet sound without an unpleasant growl noise.

In the third means, the frequency separating means for receiving the output signal of the acceleration frequency converting means and detecting the rotational frequency component of the motor is provided between the acceleration frequency converting means and the control means. Detecting a high rotation frequency of the motor increases the substantial sensitivity of the acceleration sensor, improves the detection accuracy, and greatly contributes to the reduction of humming noise. Therefore, it is possible to provide a central cleaner having a quiet sound without an unpleasant growl noise.

In the fourth means, the first acceleration sensor is attached to the first motor, the first acceleration frequency converting means for converting the output signal of the first acceleration sensor into a frequency, and the second acceleration frequency converting means. And a second acceleration frequency conversion means for converting the output signal of the second acceleration sensor into a frequency, the output signal of the two acceleration frequency conversion means being provided. Since the control means for receiving is provided, the rotation speeds of the first motor and the second motor match, and the beat noise disappears. Detecting the rotation frequency of a high-frequency motor will increase the actual sensitivity of the acceleration sensor rather than detecting the low-frequency beat vibration itself, thus improving the detection accuracy and greatly contributing to the reduction of humming noise. To do. Therefore, it is possible to provide a central cleaner having a quiet sound without an unpleasant growl noise.

In the fifth means, a first pressure sensor is attached near the intake port of the first motor, a second pressure sensor is attached near the intake port of the second motor, and two pressure sensors are attached. Since it has a control means for receiving the output signal of the pressure sensor,
The rotation speeds of the first motor and the second motor match, and the beat noise disappears. Therefore, it is possible to provide a central cleaner having a quiet sound without an unpleasant growl noise.

[Brief description of drawings]

FIG. 1 is a circuit configuration of a central cleaner showing an embodiment of the present invention.

FIG. 2 is an internal structure of a central cleaner showing another embodiment of the present invention.

FIG. 3 is a circuit configuration of a central cleaner showing another embodiment of the present invention.

FIG. 4 is a circuit configuration of a central cleaner showing another embodiment of the present invention.

FIG. 5 is a circuit configuration of a central cleaner showing another embodiment of the present invention.

FIG. 6 is a sectional view showing the internal structure of a conventional central cleaner.

[Explanation of symbols]

 9 1st motor 10 2nd motor 11 Motor room 12 Dust collection bag 13 Dust collection room 17 Acceleration sensor 18 Acceleration frequency conversion means 19 Control means 20 1st drive means 21 2nd drive means 22 Resonance board 23 Frequency separation Means 24 First acceleration sensor 25 First acceleration frequency conversion means 26 Second acceleration sensor 27 Second acceleration frequency conversion means 28 First pressure sensor 29 Second pressure sensor

Claims (5)

[Claims] 1. A motor chamber having two motors for suction and a dust collecting chamber having a dust bag, wherein an acceleration sensor is attached to an inner wall of the motor and receives an output signal of the acceleration sensor. A motor drive circuit is constituted by an acceleration frequency conversion means for converting the frequency, a control means for receiving the output signal of the acceleration frequency conversion means, and two motor drive means for receiving the output signal of the control means and driving a motor. A central cleaner. 2. The central cleaner according to claim 1, wherein a resonance plate is provided on the inner wall of the motor chamber, and an acceleration sensor is attached to the resonance plate. 3. The central cleaner according to claim 1, further comprising a frequency separating means provided between the acceleration frequency converting means and the control means for receiving an output signal of the acceleration frequency converting means and detecting a rotational frequency component of the motor. 4. A first acceleration frequency conversion means for mounting a first acceleration sensor on a first motor, converting an output signal of the first acceleration sensor into a frequency, and a second motor for the second motor. A second acceleration frequency conversion means for mounting the second acceleration sensor and converting the output signal of the second acceleration sensor into a frequency; and a control means for receiving the output signals of the two acceleration frequency conversion means. The central cleaner according to claim 1, wherein 5. A first pressure sensor is attached near the intake port of the first motor, a second pressure sensor is attached near the intake port of the second motor, and the outputs of the two pressure sensors are attached. A central cleaner according to claim 1 comprising control means for receiving signals.