JP2007195789A - Vacuum cleaner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum cleaner performing dust detection alarm and suction force control only when collecting dust from a floor surface. <P>SOLUTION: The vacuum cleaner includes an operating means for operating the motion of an electric blower 2, a dust-detecting means 11 for detecting the passage of dust in a dust collection channel, and a microcomputer (controlling means) 15 for receiving a signal from a dust-detecting means 11 to change suction force in a plurality of steps and performing alarm, and the microcomputer 15 is provided with a time period not receiving the signal from the dust-detecting means 11 or reducing motion sensitivity. Therefore, the vacuum cleaner of high handleability is provided which enables the dust detection alarm and suction force control only when collecting dust from a floor surface. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vacuum cleaner, and more particularly to control of dust detection notification.

  Conventionally, in this type of vacuum cleaner, as shown in FIG. 5, a control circuit 104 having an electric blower 102 and a signal processing unit 103 is built in the cleaner main body 101, and the hand operating unit 105 and the cleaner main body 101 are connected. The hose 106, the electric motor 108 built in the suction tool 107, the rotating brush 109 that scoops up the dust rotated by the electric motor 108, and the extension pipe 110 that connects the suction tool 107 and the hand operation unit 105. The operation unit 105 controls the suction force control of the electric blower 102 and the presence / absence of rotation of the electric motor 108.

In addition, multiple suction forces such as “off”, “automatic”, “strong”, and “weak” positions can be selected at the hand control unit. In the “strong” position, the suction force is reduced by reducing the air volume in dust collection. Therefore, in most cases, the air volume is detected by the current detection means 111 of the electric blower 102 and control is performed so as to increase the suction force. In recent years, the ability to detect the air volume by current detection has been used, and dust is collected and the current value is reduced. When the current value falls below a preset current value, the user can be notified of dust disposal and the suction force can be reduced. The control which considered this is also performed. Further, in the “Random” and “Weak” positions, a dust detecting means 112 for detecting the passage of dust is provided at the connection portion of the hose 106 on the cleaner body 101 side in the dust collecting path, and when there is dust, the suction force is increased. Control to improve dust collection efficiency is also performed so as to perform cleaning (see, for example, Patent Document 1).
JP 2002-248070 A

  However, in the conventional configuration, since the dust detection means is provided in the connection portion of the main body 101 hose 106, dust attached to the hose 106, the extension pipe 110, etc. during the previous cleaning when the cleaner is operated is removed. The dust passes through the dust detection means 112 to notify the user even though the dust is not collected from the floor surface, thereby increasing the suction force and consuming wasteful power. It was. Similarly, when the air volume that opens and closes the suction port is changed, the dust is not collected from the floor surface, but a notification is given by the remaining dust such as the hose 106, and the suction force is increased. There was a problem that it was raised and wasted power.

  In order to solve the above-described conventional problems, an electric vacuum cleaner of the present invention includes an electric blower that generates a suction force, a dust collecting unit that collects sucked dust, and a driving unit that drives the electric blower. , Operation means for operating the electric blower, dust detection means for detecting the passage of dust in the dust collection path, and a signal from the dust detection means to change the suction force in a plurality of stages and also notify The control means provides a period during which no signal is received from the dust detection means or a period during which the operation sensitivity is reduced. This makes it possible to perform dust detection notification and suction force control only when dust is being collected from the floor surface.

  The vacuum cleaner of the present invention can perform dust detection notification and suction force control only when dust is collected from the floor surface, so that wasteful power is not consumed, and notification that is suitable for actual use. Can be done.

  The first invention includes an electric blower that generates a suction force, dust collecting means for collecting sucked dust, driving means for driving the electric blower, and operating means for operating the electric blower. A dust detection means for detecting the passage of dust in the dust collection path; and a control means for receiving a signal from the dust detection means to vary the suction force in a plurality of stages and for performing notification. By providing a period during which no signal is received from the dust detection means or a period during which the operation sensitivity is reduced, dust detection notification and suction force control can be performed only when dust is collected from the floor. It is no longer necessary to consume a large amount of power, and it is possible to make notifications according to actual use.

  According to a second aspect of the present invention, the period when the signal from the dust detection unit is not received or the operation sensitivity is lowered is a predetermined time after the signal from the operation unit is received and the electric blower is activated, so that the operation starts. Dust adhering to the hose, extension pipe, etc. is removed due to the change in the air flow, and the dust detection means detects the dust so that notification and suction force control are no longer performed, and use feeling is not consumed without consuming unnecessary power. You can make a notification that suits your needs.

  According to a third aspect of the present invention, there is provided an operation means capable of selecting a plurality of suction forces, and the control means does not accept a signal from the dust detection means or varies a predetermined time for reducing the operation sensitivity by the selected suction force. Dust at low suction force is shortened by shortening the time that is not accepted during low suction force control where the air flow stability is fast compared to high suction force where the air flow stability is slow due to high air flow and slow slow start time If the suction force does not increase without detection, it is possible to suppress the remaining on the floor surface.

  4th invention is equipped with the air volume detection means which detects the dust amount of a dust collection means with an air volume, an electric current, rotation speed, or pressure, and a control means does not receive the signal from a dust detection means, or reduces operational sensitivity The period is the time from the operation of the electric blower operating until the air flow is almost stabilized after receiving the signal from the operating means, so that dust attached to the hose, extension pipe, etc. can be removed due to the air flow change at the start of operation, When the dust is detected by the dust detection means, notification and suction force control are not performed, and notification according to the actual use can be performed without consuming unnecessary power.

  According to a fifth aspect of the present invention, the control means does not accept a signal from the dust detection means or reduces the operation sensitivity when a sudden air flow change occurs during the operation. Dust adhering to hoses and extension pipes can be removed due to a change in air flow, and the dust detection means detects the dust so that notification and suction force control are no longer performed, and the user feels that they can use it without consuming unnecessary power. You can make a notification that suits your needs.

  6th invention is equipped with the impact detection means which detects the impact of a cleaner, and a control means does not receive the signal from a dust detection means, or when the impact occurs in a cleaner during the period which reduces operational sensitivity As a result, the light axis of the light detection element and the light receiving element of the dust detection means are shifted due to an impact, and the amount of light is changed, so that the dust detection means does not react, and it is possible to use it without consuming unnecessary power. You can make a notification that suits your needs.

  In a seventh invention, the dust detection means includes a plurality of amplification means that can detect the size of the dust, and the control means does not accept a signal from the dust detection means or can detect a period during which the operation sensitivity is reduced. By changing the length, the period for not accepting signals to detect small dust is long, but the period for not accepting signals to detect large dust does not accept small dust that has adhered, but the floor surface It is possible to react to a large amount of dust, and it is possible to suppress the remaining on the floor surface because dust detection is not performed and the suction force does not increase.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a circuit block diagram of the electric vacuum cleaner according to the first embodiment of the present invention, and FIG. 2 is an external view of the electric vacuum cleaner.

  In FIG. 2, reference numeral 1 denotes a main body of the electric vacuum cleaner, which has an electric blower 2 for generating a suction force and collecting dust in a dust collecting means (not shown). Reference numeral 3 denotes a hose, which connects the vacuum cleaner main body 1 to the hand operating unit 4 for switching operation positions such as “strong”, “automatic”, and “weak” which are the strength of the suction force of the electric blower 2. Reference numeral 6 denotes a suction tool for sucking dust on the surface to be cleaned in contact with the floor surface, and has a built-in rotary brush 7 for scraping dust on the surface to be cleaned and an electric motor 8 for driving the rotary brush 7. The rotating brush 7 is driven by the electric motor 8 via a belt (not shown) or the like, or the electric motor 8 is built in the rotating brush 7 and the rotating brush is connected via a gear (not shown) or the like. 7 or the like.

  Reference numeral 5 denotes an extension pipe which allows the suction tool 6 and the hose 4 to communicate with each other and can be expanded and contracted. By operating the hand operating unit 4 and driving the electric blower 2 and the electric motor 8, dust on the surface to be cleaned is scraped up from the suction tool 6, and the dust passes through the extension pipe 5 and the hose 3 to be used in the vacuum cleaner. While being transported to the main body 1, dust is collected in a dust collection chamber (not shown) built in the main body 1 of the vacuum cleaner, and the suction air is discharged from the main body 1 of the vacuum cleaner. A control circuit 9 that controls the operation of the electric blower 2 and the electric motor 8 in response to an operation from the hand operation unit 4 is built in the cleaner body 1.

  In addition, the suction tool 6 is provided with a child nozzle 10 so as to be detachable so as to be able to clean a narrow gap with the suction tool body 9, and in the “automatic” position, the state of the suction tool 6 is “leaving”, “landing”, “ The operation mode is switched by the “sub nozzle”. A connecting portion between the hose 3 and the main body 1 in the intake path is provided with dust detection means 11 for detecting the passage of dust. When no dust is detected by the dust detection means 11, the electric power of the electric blower 2 or the electric motor 8 is detected. Is reduced, and if detected, the suction force of the electric blower 2 or the electric motor 8 is increased to reduce the power consumption when there is no dust and to save energy.

  In FIG. 1, the vacuum cleaner according to the present embodiment is divided into four blocks: a vacuum cleaner body 1, a hose 3 having a hand operating section 4, an extension pipe 5, and a suction tool 6. Reference numeral 12 denotes a rotating brush. 7 is an electric motor driving means for controlling the phase of the electric motor 8 that rotationally drives the electric motor 7. 13 is an electric blower driving means for phase-controlling the electric blower 2 that generates the suction force, and is connected in series with the electric blower 2. 14 is an air volume detecting means for detecting an air volume by a current change of the electric fan 2 and is connected in series with the electric fan 2. Reference numeral 15 denotes a microcomputer which is a control means for controlling the electric power supplied to the electric blower 2 and the electric motor 8, and includes switch operation information of the hand operation unit 4, dust passing information from the dust detection means 11, and current information of the electric blower 2. Based on this information, an ignition pulse for phase control is output to the motor driving means 12 and the electric blower driving means 13 based on the information, and control is performed.

  The air volume detection means 14 converts the current into a voltage with a current transformer or the like, rectifies and smoothes the current information, and inputs the current information to the microcomputer 15. The dust detection means 11 is composed of an infrared light emitting diode and a phototransistor, and the output signal of the dust detection means 11 is composed of an operational amplifier, a comparator, etc., and a pulse signal is generated by a conversion unit 16 having an amplification function and a filter function. Thus, the amount of light blocked by the passage of dust is converted into a voltage, and is input to the microcomputer 15 as a pulse waveform when there is a change in the set voltage or more. The power source of the dust detection means 11 is also controlled by the microcomputer 15, and is supplied only when dust detection is necessary. Reference numeral 17 denotes a first DC power supply device for transmitting a signal from the hand operating unit 4 to the control circuit 11 and is constituted by a negative power supply with reference to the common line. In addition, the first DC power supply device 17 is a negative power supply of 12 V or more in order to improve the reliability of the contact point between the main body 1 and the hose 3. Reference numeral 18 denotes a second DC power supply device serving as a power source for the microcomputer 15, which is created by stepping down from the first DC power supply device 17, and is a negative power supply based on the common line. Reference numeral 19 denotes a commercial power source for supplying power to the vacuum cleaner.

  About the vacuum cleaner comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  As shown in FIG. 1, the hand operation unit 4 includes a plurality of switches SW1 to SW3 and resistors r1 to r4. The hand operation unit 4 is operated by changing the divided voltage with the resistor R built in the circuit on the main body 1 side. Is recognized, and a signal is output from the microcomputer 15 to the electric motor driving means 12 and the electric blower driving means 13 to operate the electric blower 2 and the electric motor 8 with a suction force corresponding to the hand operation. . The operation line of the electric motor 8 has a safety switch 13 connected in series with the electric motor 8, and resistances r5 and r6 as shown in FIG. The microcomputer 15 determines whether the safety switch 13 is turned ON, the motor 8 is rotated, or only the child nozzle 10 is operated by the change of the divided voltage between the resistors R2 and R3 incorporated in the circuit on the main body 1 side. Is recognized and the suction force of the electric blower 2 is controlled.

  Here, in order to recognize the ON / OFF of the safety switch 13 and the rotation of the electric motor and to reliably transmit the hand operation signal, the electric motor 8 has an OFF period of a certain time. This is because the hose 3 has a resistance component, and when a current is passed through the motor 8, a voltage drop occurs in the resistance component and the AC component is superimposed on the DC component, so that the hand operation is not normally transmitted. Because. At the same time, the situation of the suction tool 6 is recognized by the divided voltage during the OFF period.

  SW1 to SW3 of the hand operation unit 4 can be switched between “strong”, “automatic / weak”, and “off”, and when the “strong” switch that is SW3 is pressed, the microcomputer 15 recognizes the divided voltage change, A signal is transmitted to the electric motor drive means 12 and the electric blower drive means 13 so that the electric blower 2 and the electric motor 8 operate with the phase control signal, and the electric blower 2 and the electric motor 8 operate with the phase-controlled voltage.

  The strong position is the position where the maximum suction force is generated, the suction force is not changed by the dust detection means 11, and the fact that the dust is detected is only notified by a display such as a visible light-emitting diode, etc. It has become. When dust accumulates in the dust collection chamber, the air flow decreases, so the current value of the electric blower 2 decreases. Therefore, since the air volume can be detected by detecting this current change with the air volume detecting means 14, the phase value is changed so that the input increases with a decrease in the air volume up to 1150 W so that the suction force does not decrease due to the decrease in the air volume.

  Further, since the amount of dust collected can be detected as the air flow decreases, the microcomputer 15 informs the user to throw away the dust in the dust collecting chamber when the current value is equal to or lower than the preset second current value. Further, when the current value becomes equal to or lower than the first current value, the suction force is reduced before the dust overflows from the dust collecting chamber.

  Next, when the “automatic / weak” switch that is SW2 is pressed, the microcomputer 15 recognizes the change in the divided voltage, and the electric motor driving means 12 and the electric fan driving means 13 are operated by the phase control signal to the electric blower 2 and the electric motor 8. The electric blower 2 and the electric motor 8 operate with a phase-controlled voltage. The entrusted position is a recommended position in consideration of energy saving, and the power of the electric blower 2 and the electric motor 8 is varied according to the state of the suction tool 6 and information from the dust detection means 11.

  When the state of the suction tool 6 is leaving the bed, the suction force of the electric blower 2 is small and is operated at a phase of 275 W when opened. When landing, the phase is 440 W at the time of opening, and the phase is varied so that the input becomes 550 W when the air volume detecting means 14 detects that the air volume has been reduced so that the suction force does not decrease due to the decrease in the air volume. The phase of the opening is 600 W so that dust in the gap can be easily removed when the child nozzle is used, and the phase of the opening is 275 W when it is only between the extensions.

  When SW2 is pressed again, it becomes a weak position and operates in the open 200W phase. By re-clicking, the automatic position and the weak position change alternately. In the operation mode depending on the state of each suction tool 6, the input rises in response to a signal from the dust detection means 11, and the present invention controls the microcomputer 15 for the signal from the dust detection means 11. Is the point.

  When the “automatic / weak” which is SW2 is pressed, the microcomputer 15 operates the electric blower 2 and simultaneously supplies power to the dust detection means 11, whereby the dust detection means 11 starts detecting dust. Dust is detected by the dust detection means 11 and a pulse signal is input to the microcomputer 15, but the microcomputer 15 ignores the information even if a pulse signal is input for a certain period of time (for example, 200 ms) where the air flow is stable. Does not change input or display.

  Normally, when three pulse signals are input to the microcomputer 15, the input is increased or the detection display is performed. However, if ten pulse signals are not input during this fixed period, the input is not increased or displayed. The operation sensitivity is lowered. Needless to say, the power may be supplied to the dust detection means 11 after a certain time has elapsed since the operation. Further, the operation sensitivity can be lowered by changing the amplification of the converter 16 and the comparator voltage. When “strong”, which is SW3, is pressed, the time for stabilizing the air flow becomes longer, so that the pulse input is ignored and a certain period for reducing the operation sensitivity is set to be longer (for example, 500 ms). FIG. 3 shows an operation explanatory diagram after the operation.

  As described above, in the present embodiment, the hand operation is performed, the electric blower is operated, and the signal from the dust detection means 11 is ignored or the operation sensitivity is lowered for a certain period until the air volume is stabilized. As a result, the dust attached to the hose, extension pipe, etc. is removed due to the change in the air volume at the start of operation, and the dust detection means detects the dust so that the notification and suction force control are not performed, and dust is removed from the floor. Since dust detection notification and suction force control can be performed only when dust is collected, wasteful power is not consumed, and notification suitable for use can be performed. Also, by reducing the time during which low suction force control, where air flow stability is fast, and low suction force control, which is slower than high suction force, where air flow stability is slow, the suction force does not increase without detecting dust at low suction force. Leftovers on the floor can be suppressed.

(Embodiment 2)
Since the circuit block diagram and the external view are the same as those in Embodiment 1, they are omitted.

  When the “automatic / weak” which is SW2 is pressed, the microcomputer 15 operates the electric blower 2. Here, since the microcomputer 15 can recognize the change in the air volume by the air volume detecting means 14, the signal from the air volume detecting means 14 is received. During the period until stabilization, even if a pulse signal from the dust detection means 11 is input, the information is ignored and no input change or display is performed. Or the operation sensitivity is lowered than usual. The same operation is performed when “strong” which is SW3 is pressed. Further, even when a large amount of dust adheres to the suction port during the operation of the electric blower 2 or a large amount of adhering dust is removed and the airflow change changes abruptly, the microcomputer 15 uses the signal from the airflow detection means 14 to change the airflow. Since the change can be recognized, the signal from the dust detection means 11 is similarly ignored or the operation sensitivity is lowered when the air volume changes suddenly during operation. FIG. 4 shows an operation explanatory diagram after the operation.

  As described above, in the present embodiment, since the air volume detecting unit 14 can detect the period during which the air volume is stabilized at each position, a signal is output from the air volume detecting unit 14 not only during the initial operation of the electric blower 2 but also during operation. Since the signal from the dust detection means 11 can be ignored and the operation sensitivity can be reduced, the dust attached to the hose, the extension pipe, etc. can be removed not only by the start of the operation but also by the change in the air volume during the operation, Since the dust detection means detects the dust, the notification and suction force control are not performed, and the dust detection notification and suction force control can be performed only when dust is collected from the floor. Electricity is not consumed, and notification suitable for actual use can be performed.

(Embodiment 3)
FIG. 5 is a circuit block diagram of the electric vacuum cleaner according to the third embodiment of the present invention.

  Since the impact detection means 20 such as an acceleration sensor is arranged in the vicinity of the dust detection means 11 and the output signal thereof is connected to the microcomputer 15, the description thereof is omitted.

  When the electric blower 2 collides with the wall of the room while the electric blower 2 is operating or receives an impact when passing over the sill, the microcomputer 15 can detect that the impact has been received by the impact detection means 20, and the impact detection means In the period when the signal from 20 is input or for a certain period after it is input, even if the pulse signal from the dust detection means 11 is input, the information is ignored and no input change or display is performed, or usually the operation sensitivity Is to lower. FIG. 6 shows an operation explanatory diagram after the operation.

  As described above, in the present embodiment, the impact detection means 20 reacts when the light axis of the dust detection means 11 and the optical axis of the light detection element 11 are shifted due to an impact, and the light quantity changes. Notification and suction force control are not performed, and dust detection notification and suction force control can be performed only when dust is collected from the floor surface, so that wasteful power is not consumed and the user experience is felt. It was possible to report.

(Embodiment 4)
FIG. 7 is a circuit block diagram according to the fourth embodiment of the present invention. 21 includes an operational amplifier, a comparator, or the like, which is an output signal of the dust detection means 11, and has an amplification function and a filter function. It is a classification signal output means for outputting a dust detection signal and a second dust detection signal that is determined and output by a second amplification unit having a larger second amplification factor. Reference numeral 22 denotes a first dust pulse waveform capturing unit that receives the first dust detection signal and outputs a pulse waveform to the microcomputer 15, and 23 receives the second dust detection signal and outputs the pulse waveform to the microcomputer 15. It is the 2nd dust pulse taking-in part. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  Hereinafter, the operation will be described.

  The dust detection unit 11 sends the detection signal to the classification signal output unit 21 as a detection signal. The classification signal output means 21 first amplifies the received signal by the first amplifying unit, and if the result exceeds a predetermined threshold value, outputs it as a first dust detection signal. Furthermore, regardless of whether the output level is the first dust detection signal or not, if the amplification result in the second amplification unit exceeds a predetermined threshold value, the second dust detection signal is output. That is, in the case of relatively large dust, since it can be determined that the reaction has occurred with the first amplification factor, both the first dust detection signal and the second dust detection signal are output. In the case of small dust, the first amplification factor does not reach the determination level, and since it can be determined that the reaction has occurred only at the second amplification factor, only the second dust detection signal is detected. By classifying the judgment based on the difference in amplification factor, the passage speeds of the light emitting and receiving parts are equal, and the difference in pulse width cannot be obtained sufficiently (for example, dust having a diameter of 0.1 mm and dust having a diameter of 0.03 mm). Can be distinguished as signals.

  Since the size of the dust can be distinguished by the two amplification factors, the pulse input that detects small dust is ignored at the beginning of operation or when there is a sudden change in air volume, and large dust is detected for a certain period of time that reduces the operation sensitivity. Ignore the pulse input and set the time to lower the motion sensitivity to be longer.

  As described above, in the present embodiment, the size of dust can be distinguished by having a plurality of amplifying means, and a signal for detecting small dust is not accepted by changing the size to a size that can detect dust. Although the period is long, the signal to detect large dust is not accepted, so that the small dust adhering does not react, but it can react to the large dust on the floor, and it sucks in without detecting dust Leftovers on the floor due to the lack of strength can be suppressed.

  As described above, since the electric vacuum cleaner according to the present invention can change the volume of the voice notification according to the state of the vacuum cleaner, the problem that the voice notification is not transmitted to the user can be solved. Therefore, application development not only for household vacuum cleaners but also for business vacuum cleaners where maintenance is more important is useful.

The circuit block diagram of the vacuum cleaner in Embodiment 1 of this invention External view of the vacuum cleaner in the same embodiment Operation explanatory diagram in the same embodiment Operation explanatory diagram in Embodiment 2 of the present invention Circuit block diagram of the electric vacuum cleaner according to Embodiment 3 of the present invention Operation explanatory diagram in Embodiment 3 of the present invention The circuit block diagram of the vacuum cleaner in Embodiment 4 of this invention External view of conventional vacuum cleaner

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Electric blower 4 Hand operation part 11 Dust detection means 13 Electric blower drive means 14 Air volume detection means 15 Microcomputer 20 Impact detection means

Claims (7)

An electric blower for generating a suction force, a dust collecting means for collecting the sucked dust, a driving means for driving the electric blower, an operating means for operating the electric blower, and a dust collecting path A dust detecting means for detecting the passage of dust; and a control means for receiving a signal from the dust detecting means to vary the suction force in a plurality of stages and for giving a notification. The control means receives a signal from the dust detecting means. A vacuum cleaner characterized by providing a period during which no operation is accepted or a period during which operational sensitivity is reduced. 2. The electricity according to claim 1, wherein the period during which the signal from the dust detection means is not received or the operation sensitivity is lowered is a predetermined time after the signal from the operation means is received and the electric blower is activated. Vacuum cleaner. An operation means capable of selecting a plurality of suction forces is provided, and the control means does not accept a signal from the dust detection means or varies a predetermined time for reducing the operation sensitivity according to the selected suction force. The electric vacuum cleaner according to 2. It is provided with an air volume detecting means for detecting the dust amount of the dust collecting means by the air volume, current, rotation speed or pressure, and the control means does not accept a signal from the dust detecting means or reduces the operation sensitivity from the operating means. 2. The electric vacuum cleaner according to claim 1, wherein the time is from when the electric blower operates until the air flow is substantially stabilized. 5. The electric vacuum cleaner according to claim 4, wherein the control means does not accept a signal from the dust detection means, or the period during which the operation sensitivity is lowered is when an abrupt air flow change occurs during operation. An impact detection means for detecting the impact of the vacuum cleaner is provided, and the control means does not accept a signal from the dust detection means, or the period during which the operation sensitivity is reduced is when the impact occurs in the vacuum cleaner. The electric vacuum cleaner according to claim 1. The dust detection means includes a plurality of amplification means that can detect the size of the dust, and the control means does not accept a signal from the dust detection means, or is variable depending on the size of the dust that can detect the period during which the operation sensitivity is reduced. The electric vacuum cleaner according to claim 1, wherein

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