JP4980401B2 - Electric vacuum cleaner - Google Patents

Description

  The present invention relates to a vacuum cleaner in which a dust collection chamber is installed on the suction side of an electric blower.

Conventionally, filtration type filters have been used to prevent the inhalation of dust into the electric blower mounted on the vacuum cleaner body of the vacuum cleaner, but the suction force is reduced by increasing the air resistance of the ventilation path. There was concern. Further, when the filter is clogged, it takes time and effort to wash the filter or replace it with a new filter.
Therefore, there is a vacuum cleaner having a filter cleaning function that has been developed in recent years. For example, the filter itself is vibrated by rotating a motor-driven gear to shake off clogged dust (see, for example, Patent Document 1).
Another type of vacuum cleaner sweeps out filter clogging with a rotating body with a brush that rotates by the blowing force of air flowing into the suction port (see, for example, Patent Document 2).

Japanese Patent No. 3831708 (Claim 1, FIG. 2) JP 2008-35886 A (Claim 2, FIG. 2)

  The above-mentioned conventional vacuum cleaner has a structure that removes dust by shaking the filter body by vibration, or a structure that removes dust adhering to the filter with a brush that rotates by air blowing force. The weight and volume of the main body are increasing. For this reason, it cannot be said that it is convenient for the user, and there has been a problem that vibration and noise are involved in cleaning the filter.

  The present invention has been made in order to solve the above-described problems, and can save time and effort of filter maintenance without increasing the weight and volume of the main body of the vacuum cleaner. An object of the present invention is to provide a vacuum cleaner that can suppress the decrease and is convenient for the user.

The vacuum cleaner according to the present invention is provided in the vacuum cleaner body, and has a brushless DC motor having a blower fan for sucking dust from the floor nozzle, and a collector provided in the vacuum cleaner body on the suction side of the brushless DC motor. A three-phase bridge connection is established with a dust chamber, a dust collection filter inserted between the dust collection chamber and the brushless DC motor, and a check valve that can be opened and closed at the suction port of the dust collection chamber leading to the floor nozzle. In addition, the switching element is turned on so that the brushless DC motor rotates with an inverter that converts DC voltage into AC voltage and applies it to the brushless DC motor, and the direction in which dust is sucked in as a forward rotation. - an inverter control device for off control, the inverter control device, when detecting the operation of the power switch, brushless DC motor intermittently To on and off control of the switching elements so as to reverse rotate, causes closed by the check valve inlet of the dust collecting chamber by the blowing from the blowing fan to the dust collecting chamber, the deposited dust in the dust-collecting filter I tried to remove it.

In the present invention, a brushless DC motor on and off controlling the switching element to intermittently reverse rotation, is closed by the check valve inlet of the dust collecting chamber by the blowing from the blowing fan to the dust collecting chamber At the same time, the dust attached to the dust collecting filter was removed. Thereby, it becomes possible to remove the dust adhering to the dust collection filter by wind pressure, and the maintenance of the dust collection filter can be saved. Moreover, the fall of the attraction | suction force at the time of normal operation can be suppressed, and use for a long time is attained. Furthermore, it contributes to energy saving by suppressing a decrease in suction force, and does not increase the weight and volume of the main body of the vacuum cleaner when the same function is added, so that a user-friendly vacuum cleaner can be provided.

It is a block diagram which shows the external appearance of the vacuum cleaner which concerns on Embodiment 1 of this invention. It is a schematic diagram which shows the internal structure of the vacuum cleaner main body of the electric vacuum cleaner which concerns on Embodiment 1. FIG. It is sectional drawing which shows the electric blower of the vacuum cleaner which concerns on Embodiment 1. FIG. It is a block diagram which shows the structure of the drive circuit of the vacuum cleaner which concerns on Embodiment 1. FIG. FIG. 5 is a circuit diagram of the DC power supply device shown in FIG. 4. FIG. 5 is a circuit diagram of the inverter shown in FIG. 4. It is an equivalent circuit of the brushless DC motor shown in FIG. 4, and a voltage waveform diagram at the time of forward rotation and reverse rotation of the motor. FIG. 3 is a schematic diagram illustrating a dust collection chamber of the cleaner body in the first embodiment. FIG. 3 is a schematic diagram showing an air flow within the cleaner body in the first embodiment. It is a schematic diagram which shows the air flow in the cleaner body in the vacuum cleaner of Embodiment 2 of this invention.

Embodiment 1.
FIG. 1 is a configuration diagram showing an external appearance of a vacuum cleaner according to Embodiment 1 of the present invention, FIG. 2 is a schematic diagram showing an internal configuration of a vacuum cleaner body of the vacuum cleaner according to Embodiment 1, and FIG. It is sectional drawing which shows the electric blower of the vacuum cleaner which concerns on the form 1.
As shown in FIG. 1, the electric vacuum cleaner of the present embodiment has a floor nozzle 1, a cylindrical operation stick 2 detachably connected to the floor nozzle 1, and an operation stick 2 via an operation unit 3. A flexible hose 4 detachably connected and a cleaner body 5 to which the hose 4 is detachably connected are provided. The floor nozzle 1 is provided with a rotary nozzle brush on the side facing the floor surface, and is configured by a mechanism that facilitates suction of dust. The operation unit 3 is attached to the suction side of the hose 4 and is provided with a power switch for turning the power on and off, a selection switch for selecting a suction force, and the like.

  As shown in FIG. 2, the cleaner body 5 includes a dust collection chamber 51, a suction chamber 52 provided with the electric blower 8, and a circuit chamber 53 provided with a drive circuit 9. A dust collection filter 7 is provided between the dust collection chamber 51 and the suction chamber 52, and an exhaust filter 10 is provided on the exhaust side of the circuit chamber 53. Further, a check valve 6 for opening and closing a suction port 51 a communicating with the floor nozzle 1 is attached in the dust collection chamber 51. The dust collection chamber 51 uses a paper filter system or a cyclone system that separates air and dust and accumulates only dust. The dust collection filter 40 provided on the exhaust side of the dust collection chamber 51 has a structure that prevents dust from entering the suction chamber 52.

  The electric blower 8 provided in the suction chamber 52 includes a brushless DC motor 81 and a blower fan 85, as shown in FIG. The brushless DC motor 81 includes a rotor 83 using a permanent magnet and a stator 84. The blower fan 85 has a structure attached to the rotating shaft 82 of the rotor 83 of the brushless DC motor 81. The blower fan 85 is generally an axial fan or the like.

4 is a block diagram showing the configuration of the driving circuit of the electric vacuum cleaner according to Embodiment 1, FIG. 5 is a circuit diagram of the DC power supply device shown in FIG. 4, FIG. 6 is a circuit diagram of the inverter shown in FIG. FIG. 5 is an equivalent circuit of the brushless DC motor shown in FIG. 4 and voltage waveform diagrams at the time of forward rotation and reverse rotation of the motor.
The drive circuit 9 in the vacuum cleaner of this embodiment includes a DC power supply 91 that rectifies an AC voltage of a commercial power supply (for example, 100 V) applied via a power cable (not shown), and a DC power supply 91. The main circuit includes an electrolytic capacitor 92 that smoothes the rectified voltage, and an inverter 93 that converts the DC voltage smoothed by the smoothing capacitor 92 into an AC voltage and applies the AC voltage to the brushless DC motor 81 of the electric blower 8. The drive circuit 9 includes a motor current detector 94 that detects a current flowing through the brushless DC motor 81, a control power supply circuit 95 that generates a control voltage, and a DC bus voltage detector that detects a voltage input to the inverter 93. 96, a position detector 97 that detects the position of the rotor 83 of the brushless DC motor 81, and an inverter control device 98.

  As shown in FIG. 5, the DC power supply 91 includes a reactor 91 a and a converter 91 b in which four diodes 91 c are bridge-connected. The inverter 93 includes six switching elements MOS-FET 93a connected in a three-phase bridge, and a free-wheeling diode 93b connected in reverse to each MOS-FET 93a. Although it has been described that the MOS-FET 93a is used as the switching element of the inverter 93, the inverter 93 may be configured by a commonly used IGBT, for example.

  The above-described inverter control device 98 performs on / off control of the MOS • FET 93a based on the position of the rotor 83 detected by the position detector 97, and at the same time, a target corresponding to the suction force selected by the selection switch of the operation unit 3 The MOS • FET 93a is controlled so that electric power can be obtained. Whether the target power has been reached is determined by comparing the target power with the power obtained from the product of the current detected by the motor current detector 94 and the voltage detected by the DC bus voltage detector 96. .

  Further, for example, when the inverter control device 98 detects that the power switch is turned on, the inverter 93 causes the electric blower 8 to rotate in the direction opposite to the rotation direction (forward rotation) at the time of normal operation for a predetermined period of time when the power switch is detected. To control. The predetermined time is, for example, about 1 minute, and the rotation speed during reverse rotation is set in advance. Due to the reverse rotation of the electric blower 8, indoor air is sucked from the exhaust filter 10, passes through the circuit chamber 53 and the suction chamber 52, hits the dust collection filter 7, and flows into the dust collection chamber 51. At this time, the check valve 6 closes the suction port 51 a by the wind pressure, and the dust adhering to the dust collection filter 7 is sent into the dust collection chamber 51.

Here, a method for reversely rotating the electric blower 8 will be described with reference to FIG.
FIG. 7 is a voltage waveform diagram applied to each phase of the brushless DC motor and the equivalent circuit of the brushless DC motor in the first embodiment.
There are various methods for driving the electric blower 8 by the inverter 93, such as rectangular wave driving and sine wave driving. In this embodiment, the electric blower 8 is rotated by sine wave driving. In the equivalent circuit of the brushless DC motor 81 shown in FIG. 7 (1), when AC voltage is applied in the phase order of the U phase, V phase, and W phase as shown in FIG. Rotate (forward rotation). Further, for example, as shown in FIG. 7 (3), when an AC voltage is applied in the order of the U phase, the W phase, and the V phase, the motor rotates in the reverse direction. The reverse rotation of the brushless DC motor 81 is performed by turning on / off the MOS / FE 93 a of each phase of the inverter 93 by the inverter control device 98.

FIG. 8 is a schematic diagram showing the dust collection chamber of the cleaner body in the first embodiment.
When the electric blower 8 is rotating forward, air is sucked from the floor nozzle 1 side, so that the check valve 6 is opened by the air flow (see FIG. 8 (1)). On the other hand, when the electric blower 8 rotates in the reverse direction, the check valve 6 is pressed against the inner wall surface of the dust collection chamber 51 by the air flow from the reverse direction to discharge air to the floor nozzle 1 side. 51a is closed (refer FIG. 8 (2)). Thereby, the dust in the dust collecting chamber 30 can be collected without flowing out. The check valve 6 closes the suction port 51a by its own weight when the electric blower 8 is stopped.

Next, operation | movement of the vacuum cleaner of this Embodiment is demonstrated using FIG.
FIG. 9 is a schematic diagram showing an air flow in the cleaner body in the first embodiment.
When the inverter control device 98 of the drive circuit 9 detects that the power switch of the operation unit 3 is turned on, the inverter control device 98 controls the inverter 93 so that the electric blower 8 rotates backward at a predetermined rotational speed for a predetermined time. Due to the reverse rotation of the electric blower 8, the indoor air is sucked from the exhaust filter 10 as shown in FIG. 9 (2), passes through the circuit chamber 53 and the suction chamber 52, hits the dust collection filter 7, and the dust collection chamber. 51 flows in. At this time, the check valve 6 provided in the dust collecting chamber 51 is pressed against the inner wall surface of the dust collecting chamber 51 by the air flow flowing in through the dust collecting filter 7, and closes the suction port 51a. On the other hand, the dust adhering to the dust collection filter 7 is removed by the wind pressure and collected in the dust collection chamber 51.

  When a predetermined time has elapsed since the electric blower 8 is reversely rotated, the inverter control device 98 controls the inverter 93 so that the electric blower 8 stops rotating and then rotates forward. Due to the forward rotation of the electric blower 8, dust is sucked together with air from the floor nozzle 1, and reaches the cleaner body 5 through the stick 2 and the hose 4. At this time, the sucked air and dust are separated by flowing into the dust collection chamber 51 by opening the check valve 6 as shown in FIG. 9 (1), and only dust is collected in the dust collection chamber 51. It is done. Further, the separated air passes through the dust collection filter 7 to the suction chamber 52 and the circuit chamber 53 and is discharged from the exhaust filter 10 into the room.

  As described above, according to the first embodiment, when the on operation of the power switch of the operation unit 3 is detected, the electric blower 8 is reversely rotated at a predetermined rotational speed for a predetermined time, and the reverse rotation is performed. The suction port 51a of the dust collection chamber 51 is closed by the check valve 6 by the air flow. Therefore, it becomes possible to remove the dust adhering to the dust collection filter by wind pressure, and the maintenance work of the dust collection filter can be saved. Moreover, the fall of the attraction | suction force at the time of normal operation can be suppressed, and use for a long time is attained. Furthermore, it contributes to energy saving by suppressing a decrease in suction force, and does not increase the weight and volume of the main body of the vacuum cleaner when the same function is added, so that a user-friendly vacuum cleaner can be provided.

Embodiment 2.
FIG. 10 is a schematic view showing an air flow in the cleaner body in the electric vacuum cleaner according to Embodiment 2 of the present invention.
In the present embodiment, the check valve 6 that closes the suction port 51a of the dust collecting chamber 51 when the electric blower 8 is reversely rotated by turning on the power switch of the operation unit 3 does not allow dust to pass through. It has a structure to pass through. Other parts are the same as those in the first embodiment.

  In the vacuum cleaner configured as described above, when the power switch of the operation unit 3 is turned on as described above, the inverter control device 98 of the drive circuit 9 detects the on operation of the power switch and uses this as a timing. During a predetermined time, the inverter 93 is controlled so that the electric blower 8 rotates in reverse at a predetermined rotation speed. Due to the reverse rotation of the electric blower 8, the indoor air is sucked from the exhaust filter 10 as shown in FIG. 10 (2), passes through the circuit chamber 53 and the suction chamber 52, hits the dust collection filter 7, and the dust collection chamber. 51 flows in. The check valve 6 provided in the dust collection chamber 51 is pressed against the inner wall surface of the dust collection chamber 51 by the air flow flowing in through the dust collection filter 7, and closes the suction port 51a. At this time, the air flowing into the dust collecting chamber 51 flows into the hose 4 through the check valve 6 and is discharged from the floor nozzle 1 through the stick 2. On the other hand, the dust adhering to the dust collection filter 7 is removed by the wind pressure and collected in the dust collection chamber 51.

  When a predetermined time has elapsed since the electric blower 8 is reversely rotated, the inverter control device 98 controls the inverter 93 so that the electric blower 8 stops rotating and then rotates forward. The air flow and dust treatment in this case are the same as in the first embodiment. That is, dust is sucked together with air from the floor nozzle 1 by the forward rotation of the electric blower 8, and reaches the cleaner main body 5 through the stick 2 and the hose 4. As shown in FIG. 10 (1), the sucked air and dust are opened and separated into the dust collection chamber 51 by opening the check valve 6, and only dust is stored in the dust collection chamber 51. Further, the separated air is discharged, passes through the dust collection filter 7, reaches the suction chamber 52 and the circuit chamber 53, and is discharged from the exhaust filter 10 into the room.

  As described above, in the second embodiment, since the check valve 6 has a structure that allows only air to pass therethrough, the flow of air is improved during the reverse rotation of the electric blower 8, and dust adhering to the dust collection filter 7. This can prevent a decrease in the ability to remove dust. In addition, since the air passing through the check valve 6 is discharged from the floor nozzle 1 through the hose 4 and the stick 2, dust remaining in the hose 4, the stick 2 and the floor nozzle 1 can be removed. It can be used in a beautiful state, and is convenient for the user.

In the first and second embodiments, when removing dust adhering to the dust collection filter 7, when the power switch of the operation unit 3 is turned on, the electric blower 8 is set at a predetermined number of rotations for a predetermined time. Although the reverse rotation is continuously performed, the electric blower 8 may be driven by the following control.
(1) When the power switch of the operation unit 3 is turned on, the electric blower 8 is intermittently reversely rotated at a predetermined rotational speed for a predetermined time.
(2) When the power switch of the operation unit 3 is turned on, the electric blower 8 is alternately rotated forward and reverse at a predetermined rotational speed for a predetermined time.

  In the first and second embodiments, the electric blower 8 is reversely rotated when the power switch of the operation unit 3 is turned on as described above. However, the electric blower is turned off after the power is turned off by re-operation of the power switch. 8 may be rotated in the reverse direction. As a power source for rotating the electric blower 8 in the reverse direction, for example, a voltage charged in the electrolytic capacitor 92 of the drive circuit 9 is used. Moreover, as control of the electric blower 8 at that time, in addition to those described in the first and second embodiments, either (1) or (2) described above may be used.

  Furthermore, in Embodiments 1 and 2, the reverse rotation of the electric blower 8 is driven at a constant rotational speed, but the present invention is not limited to this. For example, a plurality of rotation speeds are set in advance in the inverter control device 98 of the drive circuit 9, and the rotation speed is selected by the switch of the operation unit 3 when the electric blower 8 is reversely rotated or reversely rotated. Then, the inverter control device 98 controls the inverter 93 so that the electric blower 8 rotates in reverse at the selected number of rotations.

DESCRIPTION OF SYMBOLS 1 Floor nozzle, 2 Stick, 3 Operation part, 4 Hose, 5 Vacuum cleaner main body, 6 Check valve, 7 Dust collection filter, 8 Electric blower, 9 Drive circuit, 10 Exhaust filter, 51 Dust collection chamber, 51a Suction port, 52 suction chamber, 53 circuit chamber, 81 brushless DC motor, 82 rotating shaft, 83 rotor, 84 stator, 85 blower fan, 91 DC power supply, 91a reactor, 91b converter, 91c rectifier diode, 92 electrolytic capacitor, 93 inverter, 93a MOS FET, 93b freewheeling diode,
94 motor current detector, 95 control power supply circuit, 96 DC bus voltage detector, 97 position detector, 98 inverter control device.

Claims (7)

A brushless DC motor provided in the vacuum cleaner body and having a blower fan for sucking dust from the floor nozzle;
A dust collection chamber provided on the suction side of the brushless DC motor in the vacuum cleaner body;
A dust collection filter inserted between the dust collection chamber and the brushless DC motor ;
A check valve that is openably and closably provided at a suction port of the dust collection chamber that communicates with a floor nozzle;
An inverter having six switching elements connected in a three-phase bridge, converting a DC voltage to an AC voltage and applying the same to the brushless DC motor;
An inverter control device that controls on / off of the switching element so that the brushless DC motor rotates with the direction of sucking dust as a forward rotation ,
The inverter control device, when detecting the operation of the power switch, the brushless DC motor is the on-off control of the switching element to intermittently reverse rotation, it is blown from the blower fan into the dust collecting chamber A vacuum cleaner characterized in that the suction port of the dust collecting chamber is closed by the check valve, and dust attached to the dust collecting filter is removed. 2. The electric cleaning according to claim 1, wherein the check valve closes the suction port of the dust collecting chamber and allows only air to pass through the suction port when the brushless DC motor rotates reversely. Machine. 3. The electric vacuum cleaner according to claim 1, wherein the inverter control device is driven at a predetermined number of rotations for a predetermined time when the brushless DC motor is reversely rotated. 3. The electric vacuum cleaner according to claim 1, wherein when the brushless DC motor is rotated in the reverse direction, the drive circuit is driven alternately with a forward rotation at a predetermined rotation speed for a predetermined time. The inverter control device, when the power is turned on from the off state, the electric vacuum cleaner according to any one of claims 1 to 4, characterized in that to reverse the rotation of the brushless DC motor. The inverter control device, when the power is turned off from the on state, the electric vacuum cleaner according to any one of claims 1 to 4, characterized in that to reverse the rotation of the brushless DC motor. The inverter control device has a plurality of rotation speeds set in advance, and when the rotation speed is selected when the brushless DC motor is reversely rotated or reversely rotated, the brushless DC motor is rotated at the rotation speed. The vacuum cleaner according to any one of claims 1 to 6 , wherein the vacuum cleaner is reversely rotated.

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