JP4549369B2 - Vacuum cleaner - Google Patents

Description

  The present invention relates to a vacuum cleaner provided with a suction body in which an electric motor for a rotating brush suitable for cleaning a carpet or the like that does not suck dust is good.

  An electric vacuum cleaner provided with a suction body in which an electric motor for a rotating brush is installed is described in, for example, Japanese Patent Application Laid-Open No. 2000-210234 (Patent Document 1).

  Further, an electric vacuum cleaner provided with a suction body provided with a display lamp that indicates the output of a motor provided in the vacuum cleaner stepwise is disclosed in Japanese Patent Laid-Open No. Hei 5-161579 (Patent Document 2).

JP 2000-210234 A JP-A-5-161579

  The vacuum cleaner described in Patent Document 1 or the like can be operated in any operation mode even when the operation mode (strong operation (high speed), medium operation (medium speed), weak operation (low speed)) of the electric motor for the rotating brush is switched. It was difficult to judge whether he was driving in

  In the vacuum cleaner described in Patent Document 2, a power supply wire that supplies power to a lamp driving circuit that drives a display lamp provided on a suction body and a signal supply wire that supplies signals to the lamp driving circuit are separately extended. The pipe is crushed to electrically connect the vacuum cleaner body and the mouthpiece. For this reason, the wiring of the extension pipe becomes complicated and unsuitable for mass production.

  In addition, the display using the display lamp requires a stable display that does not disturb the lighting. Furthermore, there is also a vacuum cleaner provided with an automatic switching control device in which the operation mode of the rotary brush motor is automatically switched according to the load state.

  In this automatic switching, the load current of the rotating brush motor is detected and controlled by a current detection circuit. However, when switching from a weak operation (low speed) operation mode such as flooring or tatami to a medium operation (medium speed) operation mode such as a shallow carpet, automatic switching is performed smoothly and there is a problem.

  An object of this invention is to provide the vacuum cleaner suitable for mass production, without the wiring of an extension pipe becoming complicated in view of said subject.

  The present invention relates to a vacuum cleaner including a suction body having a rotary brush motor whose operation mode can be changed by phase-controlled AC power, and the rotary brush motor according to the AC power supplied to the suction body. It has the display means which displays an operation mode, It is characterized by the above-mentioned.

  ADVANTAGE OF THE INVENTION According to this invention, wiring is not complicated and the vacuum cleaner suitable for mass production can be provided.

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

  First, an overall outline of a vacuum cleaner will be described with reference to FIG.

  As shown in FIG. 1, the vacuum cleaner includes a cleaner body 1, a suction body 2, an extension pipe 3, and a suction hose 4. The ventilation pipe line including the extension pipe 3 and the suction hose 4 connects the cleaner body 1 and the suction body 2 so as to communicate with each other.

  The vacuum cleaner main body 1 has an electric blower in which a blower that sucks air and an electric motor that drives the blower are integrated. In addition, a dust collection filter that collects dust by filtering dust from the air sucked by the electric blower is disposed on the front side (upstream side) of the electric blower.

  The suction body 2 is connected to the tip of the extension pipe 3 of the ventilation duct, and the rear end of the suction hose 4 is connected to the cleaner body 1. Due to the suction force of the electric blower, the dust air sucked into the suction body 2 flows through the ventilation duct and is collected by the dust collecting filter of the cleaner body 1.

  The extension tube 3 has a handle portion 5. A hand switch 6 is provided on the handle portion 5. The vacuum cleaner is operated by pressing the hand switch 6. The hand switch 6 will be described in detail later.

  The mouthpiece 2 will be described with reference to FIGS.

  The mouthpiece 2 has a mouthpiece body 20 and a joint 21. The suction body 20 and the joint 21 are connected by a universal joint. As shown in FIG. 3, when the upper case 22 is removed, the inside of the mouthpiece body 20 is viewed.

  As shown in FIGS. 3 and 4, the rotating brush 23 extending horizontally is placed on the mouthpiece body 20 so as to be freely rotatable. The rotary brush 23 has a brush implanted around it. The rotary brush motor 24 installed in the suction body 20 is transmitted with rotational power to the rotary brush 23 via a belt.

  With the rotation of the rotating brush 23, dust existing in the carpet is scraped out and sucked into the mouthpiece 2. The rotating brush motor 24 has a plurality of operation modes. The strong operation (high speed), medium operation (medium speed), and weak operation (low speed) included in the operation mode are automatically or arbitrarily switched according to the load of the rotating brush motor. The operation mode can be provided in addition to the three modes.

  The mouthpiece 2 includes a display mechanism (display means) that displays the operation mode of the rotating brush motor. As shown in FIG. 4, FIG. 3, and FIG. 25B, a light guide member 26, a circuit board 27 around the power source, other circuit boards 28, lead wires 29, and a transparent window 30.

  Two pairs of LEDs 25A. 25B is placed symmetrically on the left and right. LED25A. The light guide member 26 placed so as to face 25B is arranged so as to extend to the left and right of the mouthpiece 2. LED25A. The light emitted from 25B passes through the light guide member 26, so that the light guide member 26 emits light. LED25A. 25B, the light guide member 26, and the transparent window 30 become a display part of a display means.

  When the LED 25A is lit, the light guide member 26 emits red light. When the LED 25B is lit, the light guide member 26 emits green light. Two LEDs 25A. When 25B lights up together, the light guide member 26 becomes orange. Thus, the display color to emit light changes depending on the location where the LED is lit and the increase / decrease in lighting.

  The changing display color is displayed from the transparent window 30. The display of the color change extending in the longitudinal direction of the mouthpiece 2 can be seen by the mouthpiece 2. The display of this color change and the operation mode of the rotating brush motor are determined. Red is a strong operation (high speed) operation mode, orange is a medium operation (medium speed) operation mode, and green is a weak operation (low speed) operation mode, but other combinations may be used. It is also possible to use lamps other than LEDs for illumination.

  As described above, since the operation mode of the rotary brush motor can be recognized by the color change of the display mechanism (display means) provided in the mouthpiece 2, it is possible to provide a vacuum cleaner that is easy to identify and easy to use.

  The hand switch 6 will be described with reference to FIG.

  The hand switch 6 includes a power brush on / off push button 60, a strong / medium / weak push button 61, an automatic push button 62, and a cut push button 63.

  The power brush on / off push button 60 is a push button for manually operating the rotary brush motor 24. When the power brush on / off push button 60 for setting the manual switching mode is pressed, the rotary brush motor 24 is operated. Further, when the power brush ON / OFF push button 60 is pressed, the operation of the rotary brush motor 24 is stopped.

  The strong / medium / weak push button 61 is a push button for switching the operation mode of the rotary brush motor 24 and the electric blower of the cleaner body 1 together. In the order of strong operation (high speed), medium operation (medium speed), weak operation (low speed), and strong operation (high speed), the strong / medium / weak push button 61 switches the operation mode.

  The automatic push button 62 is a push button that automatically sets the operation mode switching of the rotary brush motor 24. When the automatic push button 62 is pressed, the automatic switching mode is set. When the automatic push button 62 is pressed further, the setting of the automatic switching mode is canceled.

  When the off push button 63 is pressed, a standby state is entered. This is used when the setting by the push button is canceled or when the rotary brush motor 24 is locked.

  An initial transition form in which the automatic push button 62 is pressed will be described with reference to FIG.

  In step 620, the automatic push button 62 is depressed. Immediately after that, the speed fluctuation (increase / decrease) of the rotary brush motor 24 based on the operation mode of the strong operation (high speed) is repeated (step 621). At a rate of increase / decrease of 10 percent, the speed change operation is performed for about 3 seconds (622), and then a predetermined strong operation (high speed) is performed (step 623).

  As described above, when the automatic switching mode is selected with the automatic push button 62, the speed increase / decrease of the rotary brush motor based on the strong operation (high speed) operation mode is increased prior to the setting of the strong operation (high speed). Run for a few seconds. As a result, it is possible to realize that the automatic switching mode has been selected due to the fluctuation accompanying the speed fluctuation.

  In addition to this speed fluctuation, the display color is changed by switching the lighting of the LED of the display means by changing the power supplied to the rotating brush motor 24 (alternative 1), or by using a sound notification means such as a buzzer ( Alternative 2) It can be further felt that the automatic switching mode has been selected.

  Instead of shifting to a predetermined strong operation (high speed) (step 623), a medium operation (medium speed) or a weak operation (low speed) may be used.

  The operation mode of the rotary brush motor 24 and the display of the display mechanism (display means) will be described with reference to FIGS.

  The overall electric circuit of the vacuum cleaner shown in FIG. 6 has a cleaner main body side electric circuit 100, a mouthpiece side electric circuit 300, and two electric wires 200 connecting the two electric circuits. The two electric wires 200 supply electric power to the mouthpiece-side electric circuit 300, and are fed to a ventilation pipe line including the extension pipe 3 and the suction hose 4.

  The vacuum cleaner main body side electric circuit 100 is mostly occupied by the control board 102 except for the electric motor 101 of the electric blower.

  The control board 102 includes various control means. Mainly, the microcomputer 103 which is a main part of the control means, the drive circuit 104 of the electric motor 101, the semiconductor switching element including the triac 105 which drives the electric motor 101, the drive circuit 106 of the electric motor 24 for the rotating brush, and the rotating brush A semiconductor switching element including a triac 107 for driving the electric motor 24 and a current detection circuit 108 (detection means) for detecting a load current of the rotary brush electric motor 24 are included.

  A commutator motor is used as the motor 101 and the rotating brush motor 24. A brushless motor can be used instead of the commutator motor. The operation modes of the motor 101 and the rotating brush motor 24 are switched by speed control. The speed control is performed by changing the phase time width of the AC power supplied to the motor 101 and the rotating brush motor 24 by phase control.

  When the drive circuit 104 and the drive circuit 106 adjust the energization phase time width of the triac 105 and the triac 107, the electric motor 101 and the rotary brush electric motor 24 rotate at speeds of various operation modes.

  Most of the mouthpiece-side electric circuit 300 is occupied by the mouthpiece control board 301 except for the rotary brush motor 24. The inlet control board 301 shows the power supply circuit board 27 and the other circuit boards 28 together.

  The suction control board 301 is occupied by the electric circuit of the display means described above. The electric circuit of the display means includes a rectifier circuit 302, a voltage dividing circuit 303, a constant voltage power supply circuit 304, a rectangular wave shaping circuit 305, and a waveform comparison circuit 306. Further, the electric circuit of the display means includes the LED 25A. 25B includes LED1, LED2, LED drive circuit (A) 307, and LED drive circuit (B) 308.

  LED1, LED2, LED drive circuit (A) 307, and LED drive circuit (B) 308 are included in the display unit of the display means described above.

  The waveform comparison circuit 306 functions as a switching unit (switching unit) that switches increase / decrease of lighting of LED1 and LED2 and a lighting location.

  Since the electric circuit of the display means is connected in parallel to the rotating brush motor 24, AC power having the same phase and the same waveform as the AC power supplied to the rotating brush motor 24 is supplied.

The rectifier circuit 302 converts the phase-controlled AC power into pulsating DC. The direct current of the pulsating flow is divided by the voltage dividing circuit 303. The divided direct current of 10 V pulsating current is supplied to the constant voltage power supply circuit 304. The constant voltage power supply circuit 304 converts the pulsating direct current having a large voltage variation into a DC constant voltage of 10 V, and supplies driving power for the LED1, LED2, LED driving circuit (A) 307, and LED driving circuit (B) 308. .

  The rectangular wave shaping circuit 305 creates a rectangular wave signal to be supplied to the waveform comparison circuit 306. The waveform comparison circuit 306 drives the LED drive circuit (A) 307, drives the LED drive circuit (B) 308, or drives both simultaneously according to the rectangular wave signal.

  By driving the LED drive circuit (A) 307 and the LED drive circuit (B) 308, the LEDs 1 and 2 are turned on.

  The lighting of LED 1 and LED 2 corresponds to the operation mode of the rotating brush motor 24 as described above, and the display according to the operation mode is displayed according to the color, so that the operation mode can be easily known. Can do.

  The generation of the rectangular wave signal and the relationship between the rectangular wave signal and the operation mode will be described with reference to FIG.

  FIG. 7 shows waveforms 401, 402, and 403 (upper side) of the phase-controlled AC power supplied to the rotary brush motor 24 and rectangular wave signals 501, 502, and 503 (lower side) generated by the rectangular wave shaping circuit 305. Side).

  A waveform 401 has a phase time of 100% energization (long), a waveform 402 has a phase time of 70% energization (middle), and a waveform 402 has a phase time of 60% energization (short). The rectangular wave signals 501, 502, and 503 are generated so as to meet this phase time. Therefore, the rectangular wave signal 501 corresponds to a strong operation (high speed) operation mode, the rectangular wave signal 502 corresponds to a medium operation (medium speed) operation mode, and the rectangular wave signal 503 corresponds to a weak operation (low speed) operation mode. .

  When the input of the rectangular wave signal 501 is read, the waveform comparison circuit 306 outputs the LED driving circuit (A) 307 so as to be driven. When the input of the rectangular wave signal 503 is read, the waveform comparison circuit 306 outputs so that the LED driving circuit (B) 307 is driven. When the input of the rectangular wave signal 502 is read, the waveform comparison circuit 306 outputs so that both the LED drive circuit (A) 307 and the LED drive circuit (B) 308 are driven.

  As a result, display according to the color corresponding to the operation mode of strong operation (high speed), medium operation (medium speed), and weak operation (low speed) is performed on the display unit of the display means. Can be easily known.

This husband by the display means according to the operating mode of the rotating brush electric motor 24 s display is realized by generating a square wave signal commensurate with the phase time width of the phase controlled AC power to the rotary brush electric motor 24 No electric wires other than supplying AC power are required.

  For this reason, there is no need to provide a signal line for electrically connecting the vacuum cleaner body and the suction body as described in Patent Document 2 to the extension pipe that connects the vacuum cleaner body and the suction body. It is not complicated and suitable for mass production.

  In the above embodiment, the rectangular wave signal corresponding to the phase time width of the phase-controlled AC power is used, but the amount of AC power phase-controlled, the phase time width, where it is supplied to the rotary brush motor 24, Any AC waveform may be read and displayed according to the operation mode.

  Among these, the use of a rectangular wave signal corresponding to the phase time width does not complicate the circuit configuration and is suitable for mass production.

  Next, avoidance of the influence of the counter electromotive force of the rotary brush motor on the rectangular wave signal will be described with reference to FIG.

  The DC waveforms 402A and 402B of the pulsating flow shown in FIG. 8 are waveforms that are taken into the rectangular wave shaping circuit 304 from the voltage dividing circuit 303. This corresponds to the AC power waveform 402 shown in FIG.

  The rectangular wave shaping circuit 304 generates a rectangular wave signal 502 using the pulsating DC waveforms 402A and 402B.

  The rectangular wave signal 502 rises (ON) when the voltage of the DC waveform of the pulsating current reaches the threshold value 1 (threshold of the start specified voltage that determines the start time), and the voltage of the DC waveform of the pulsating current determines the threshold value 2 (determines the end time). It falls (off) when it falls below the threshold of the end specified voltage.

  As shown in FIG. 8, the back electromotive force component 4020 of the rotating brush motor 24 is affected at the end of the pulsating DC waveform. When the threshold value 2 is set to a low value like the threshold value 1, the end point of the rectangular wave signal 502 extends as indicated by the hatched line 5020. Moreover, the extension time is not constant and is indefinite.

  For this reason, the phase time width of the rectangular wave signal 502 is not determined, and the waveform comparison circuit 305 repeats misjudgment, and the lighting of the LEDs 1 and 2 is disturbed.

  Therefore, the threshold value 2 is set so that the counter electromotive force of the rotating brush motor with respect to the AC power is not affected. Thereby, the end time of the rectangular wave signal 502 can be stabilized, and the lighting disturbance of the LED1 and LED2 is eliminated.

  On the other hand, the threshold 1 is preferably as low as possible. This is because the time width of the rectangular wave signal approaches the phase time width of the AC power subjected to phase control. Therefore, threshold 1 is set lower than threshold 2.

  The constant voltage power supply circuit 304 changes a pulsating direct current having a large voltage fluctuation into a 10 V direct current constant voltage. Since the LED drive circuit (A) 307, the LED drive circuit (B) 308, LED1, and LED2 are driven by this stable DC constant voltage, the lighting display of LED1 and LED2 is stabilized.

  Next, automatic switching of the operation mode of the rotating brush motor and smooth switching of the operation mode will be described with reference to FIGS. 9, 10, and 11.

  First, the current detection of the current detection circuit 108 (detection means) in which the rotary brush motor determines the load on the floor will be described with reference to FIG.

  FIG. 9 shows current vertically and time horizontally. The weak determination, medium determination, and strong determination shown here are measured values of the load current 900 that flows through the rotary brush motor by moving the suction body back and forth. The amplitude H of the load current 900 is small in the weak determination, and gradually increases to the medium determination and the strong determination.

  The period width L of the load current 900 is slightly changed by changing the speed of the front and rear movement of the mouthpiece.

  When the floor is folded and the flooring is performed, the amplitude H of the load current 900 is small and a weak determination is made. On the contrary, in a carpet with deep eyes, the amplitude H of the load current 900 is large and a strong determination is made. For a carpet with shallow eyes, it is judged as medium.

  Thus, by viewing the load current of the rotary brush motor detected by the current detection circuit 108 (detection means), it is possible to determine the load state (the type / situation of the floor surface to be cleaned) with respect to the rotary brush motor 24. On the basis of this determination, the microcomputer 103 shown in FIG. 6 is programmed so that the operation of the rotating brush motor 24 according to the load state is executed.

  The contents of the program will be described with reference to the state chart (state transition) shown in FIG.

  When the power brush on / off push button 60 of the hand switch 6 shown in FIG. 9 is pressed, the manual switching mode 1000 is selected. When the automatic push button 62 is pressed, the automatic switching mode 2000 is selected.

  In step 3000, the power is turned off. When the power is turned on, the standby state 3001 is entered. When the manual switching mode 1000 or the automatic switching mode 2000 is selected from the standby state 3001 and the off push button 63 is pressed, the standby state 3001 is restored.

  In the manual switching mode 1000, the process proceeds from the start step 1001 to the operation mode steps 1002, 1003, and 1004. Step 1002 is a strong operation (high speed) operation mode, step 1003 is a medium operation (medium speed) operation mode, and step 1004 is a weak operation (low speed) operation mode.

  Switching of the operation mode is performed with the strong / medium / weak push button 61. It switches in the order of strong operation (high speed) operation mode, medium operation (medium speed), weak operation (low speed), and strong operation (high speed).

  In the automatic switching mode 2000, the routine automatically moves from step 2001 to step 2002. Step 2002 is a strong operation (high speed) operation mode. The reason why the first step of the operation mode is the strong operation (high speed) is that there is a general tendency to start from the strong operation (high speed). Moreover, as will be described later, it is convenient for automatic determination of the load state.

  Step 2003 is an operation mode of medium operation (medium speed), and step 2004 is an operation mode of weak operation (low speed). The operation modes including strong operation (high speed), medium operation (medium speed), and weak operation (low speed) are automatically switched according to the determination of the load state.

  In the operation of the automatic switching mode 2000, as shown in FIG. 9, when shifting from step 2004 (weak operation (low speed) operation mode) to another operation mode, a program that passes through the strong operation (high speed) operation mode. Made the configuration.

  This is because the determination of the load state depends on the current detected by the current detection circuit 108 (detection means), and therefore the current change is small in the weak operation (low speed) operation mode, so that the determination cannot be made quickly. As can be understood from the description of FIG. 9, the detection current of the current detection circuit 108 (detection means) in the weak operation (low speed) operation mode is small, which makes determination difficult.

  As a result, although the load state (the type / situation of the floor surface to be cleaned) has changed, the operation mode that follows the transition is not smoothly performed, so that the usability is not good.

  Therefore, if there is a change in the load state during operation in the weak operation (low speed) operation mode, the load state can be determined by temporarily changing to the strong operation (high speed) operation mode and expanding the current change. It is done quickly without error. For this reason, it is possible to provide an easy-to-use vacuum cleaner in which the operation mode transition according to the load state (type / situation of floor to be cleaned) is smoothly performed.

  FIG. 12 is a graph showing each determination and detection current in each operation mode.

  As can be understood from this graph and the description of FIG. 12, in the weak operation (low speed) operation mode, the detected current is small from the weak determination to the strong determination, and the current change is small. On the other hand, in the strong operation (high speed) operation mode, the detected current is large and the current changes frequently from the weak determination to the strong determination.

  Therefore, when there is a change in the load state (the amplitude of the current is greater than the weak judgment) during the weak operation (low speed) operation mode, the mode is changed to the strong operation (high speed) operation mode. Judgment is made in operation mode. Since the current change expands, an accurate determination without error can be quickly performed.

It is a perspective view which concerns on the Example of this invention and shows the whole vacuum cleaner. It is a figure which concerns on the Example of this invention and looked at the suction body from the front. It is a perspective view which concerns on the Example of this invention and decomposed | disassembled and showed the suction body. It is a figure which concerns on the Example of this invention and removed the upper case and showed the inside of a suction mouth. It is a figure which concerns on the Example of this invention and shows the hand switch provided in the handle part of the extension pipe. FIG. 5 is a diagram schematically showing an overall electric circuit of a vacuum cleaner according to an embodiment of the present invention. It is a figure which concerns on the Example of this invention, and showed the rectangular wave signal which performs the display switching of the display means provided in the suction body and the power waveform from which the phase time width supplied to the motor for rotary brushes differs. FIG. 7 is a diagram for explaining a variation in time width of a rectangular wave signal due to an influence of a counter electromotive force and a rectified pulsating waveform obtained by rectifying the AC power waveform shown in FIG. 6 according to the embodiment of the present invention. FIG. 14 is a diagram for explaining a change in current amplitude of the current detection circuit according to the embodiment of the present invention. FIG. 7 is a diagram illustrating an automatic switching mode and a manual switching mode in a state chart (state transition) indicating an operation function according to the embodiment of the present invention. FIG. 5 is a diagram illustrating an initial operation function in which the manual switching mode is selected according to the embodiment of the present invention in a flowchart. FIG. 10 is a diagram illustrating a relationship between an operation mode and a detection current of a detection circuit in determining the load state in the automatic switching mode according to the embodiment of the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Vacuum cleaner main body, 2 ... Suction body, 3 ... Extension pipe, 4 suction hose, 5 ... Handle part, 6 ... Hand switch, 20 ... Suction body, 21 ... Joint, 22 ... Upper case, 23 ... Rotating brush, 24 Electric motor for rotating brush, 25A ... LED1, 25B ... LED, 26 ... Light guide member, 27 ... Circuit board around power supply, 28 ... Circuit board, 29 ... Lead wire, 30 ... Transparent window, 60 ... Button, 61 ... Button, 62 ... button, 63 ... button, 100 ... vacuum cleaner body side electric circuit, 101 ... electric motor, 102 ... control board, 103 ... microcomputer, 104 ... drive circuit, 105 ... triac, 106 ... drive circuit, 107 ... triac, 108 ... Current detection circuit, 200 ... electric wire, 300 ... mouthpiece side electric circuit, 301 ... mouthpiece control board, 302 ... rectifier circuit, 303 ... voltage dividing circuit, 304 ... constant voltage power supply circuit, 305 ... Shape wave shaping circuit, 306 ... Waveform comparison circuit, 401 ... Waveform, 402 ... Waveform, 403 ... Waveform, 402A ... DC waveform, 402B ... DC waveform, 501 ... Rectangular wave signal, 502 ... Rectangular wave signal, 503 ... Rectangular wave signal , 900 ... Load current, 1000 ... Manual switching mode, 2000 ... Automatic switching mode, 3001 ... Standby state, 4020 ... Component, 5020 ... Diagonal line, 620 ... Step, 621 ... Step, 622 ... Step, 623 ... Step, 3000 ... Step , 1001 ... step, 1002 ... step (strong operation (high speed) operation mode), 1003 ... step (medium operation (medium speed) operation mode), 1004 ... step (weak operation (low speed) operation mode), 2001 ... Step, 2002 ... Step (Operation mode of strong operation (high speed)), 2003 ... Step (Medium operation (medium speed) Operation mode), 2004 ... step mode of operation of the (weak operation (slow)).

Claims (4)

A vacuum cleaner body having a blower motor, a suction body having a rotary brush motor whose operation mode can be changed by AC power of phase control, an AC power provided to the rotary brush motor provided in the vacuum cleaner body In a vacuum cleaner comprising a control means for performing phase control, the suction body and the main body of the vacuum cleaner, and a ventilation duct through which an electric wire supplying the AC power is wound,
The mouthpiece has display means for changing display according to a phase time width of the AC power supplied to the rotary brush motor ,
An electric circuit of the display means is connected in parallel to the rotary brush motor in the suction body, and acquires the AC power supplied from the cleaner body to the rotary brush motor via the ventilation duct. ,
The electric circuit of the display means includes a rectifier circuit that converts alternating current power of the phase time width into direct current, a voltage dividing circuit that divides the direct current, a constant voltage power supply circuit that converts the direct current to a constant direct current, and A rectangular wave shaping circuit that generates a rectangular wave signal corresponding to the phase time width of the AC power according to the operation mode; and a waveform comparison circuit that drives a display driving circuit according to the rectangular wave signal. Characterized vacuum cleaner. A vacuum cleaner body having a blower motor, a suction body having a rotary brush motor whose operation mode can be changed by AC power of phase control, an AC power provided to the rotary brush motor provided in the vacuum cleaner body In a vacuum cleaner comprising a control means for performing phase control, the suction body and the main body of the vacuum cleaner, and a ventilation duct through which an electric wire supplying the AC power is wound,
The mouthpiece has display means for changing display according to a phase time width of the AC power supplied to the rotating brush motor ,
An electric circuit of the display means is connected in parallel to the rotary brush motor in the suction body, and acquires the AC power supplied from the cleaner body to the rotary brush motor via the ventilation duct. ,
An electric circuit of the display means includes a rectifier circuit that converts the alternating current power of the phase time width into a direct current of the pulsating current, a voltage dividing circuit that divides the direct current of the pulsating current, and a direct current of the pulsating current that is a constant voltage direct current. And a rectangular wave shaping that generates a rectangular wave signal corresponding to the phase time width of the AC power according to the operation mode using the pulsating direct current divided by the voltage dividing circuit. A vacuum cleaner comprising: a circuit; and a waveform comparison circuit that drives a display drive circuit in accordance with the rectangular wave signal . The vacuum cleaner according to claim 1 or 2,
The rectangular wave shaping circuit generates the rectangular wave signal by rising when the divided DC voltage reaches a threshold value 1 and decreasing when the divided DC voltage falls below the threshold value 2. ,
The threshold value 1 is lower than the threshold value 2. The electric vacuum cleaner according to claim 3,
The threshold value 2 is set to a value that does not affect the counter electromotive force of the rotating brush motor with respect to AC power.

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