JPH0779786B2 - Vacuum cleaner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention relates to a vacuum cleaner that can be used with a so-called charging / discharging dual power source with reduced power loss.

(Prior Art) Conventionally, as a vacuum cleaner using a secondary battery, for example, a configuration described in Japanese Patent Laid-Open No. 62-47326 is known.

The electric vacuum cleaner described in Japanese Patent Laid-Open No. 62-47326 is to drive the electric motor by controlling the on / off of the direct current of the secondary battery by the chopper control unit and supplying it to the electric motor.

In addition, in the electric vacuum cleaner using the secondary battery as described above, when the handle has the switch, generally, electric power is transmitted between the switch of the handle, the electric blower and the power source at a battery voltage or less.

(Problems to be Solved by the Invention) However, since the voltage of the secondary battery is low, it is necessary to increase the current in order to obtain the required power.
Is a current value and R is a resistance value, W = I ² R, so that the power loss is very large.

In particular, in an electric vacuum cleaner such as an upright type or a bloom type, since the handle is separated from the main body of the vacuum cleaner, the power transmission path to the switch of the handle becomes very long and the power loss becomes very large. However, there is a problem that it is difficult to provide a switch on the handle and supply power for control.

The present invention has been made in view of the above problems, and a switch is provided in a handle apart from an electric vacuum cleaner body with a small power loss,
Another object of the present invention is to provide an electric vacuum cleaner provided with a brush DC motor that can be driven by a common power source.

[Structure of Invention]

(Means for Solving Problems) An electric vacuum cleaner according to a first aspect of the present invention includes an electric blower having a DC motor and a secondary battery, and an electric vacuum cleaner provided with a dust collecting portion communicating with the electric blower. Main body, a handle attached to the main body of the electric vacuum cleaner, a suction port provided on the suction side of the dust collecting portion of the main body of the electric vacuum cleaner, having a built-in DC motor for the brush, and driving the rotating brush with the DC motor for the brush A power conversion circuit that includes a body, an inverter circuit that is connected to the secondary battery, and that converts the direct current of the secondary battery into an alternating current, and that boosts the voltage to almost commercial alternating voltage; and an output of the power conversion circuit that is connected to the electric blower. A rectifier for the blower that rectifies the
A brush rectifier that is connected to the brush DC motor and rectifies the output of the power conversion circuit, and is disposed in the handle, and is connected between the power conversion circuit and the blower rectifier and the brush rectifier. And a switch for controlling the electric blower and the brush DC motor.

An electric vacuum cleaner according to a second aspect of the present invention includes an electric blower main body having a built-in electric blower having a DC electric motor and a secondary battery, and provided with a dust collecting portion communicating with the electric blower, and attached to the electric vacuum cleaner main body. The handle, the power cord detachably connected to the handle, the suction side of the dust collecting part of the vacuum cleaner body, the DC motor for the brush is built in, and the rotating brush is driven by the DC motor for the brush. And a power conversion circuit that is connected to the secondary battery and that includes an inverter circuit that converts the direct current of the secondary battery into an alternating current, and that boosts the voltage to approximately commercial alternating current voltage; and the power conversion circuit that is connected to the electric blower. A blower rectifier that rectifies the output of the circuit, a brush rectifier that is connected to the brush DC motor and rectifies the output of the power conversion circuit, and the power converter that is disposed in the handle. A switch which is connected between a blower and the blower rectifier and the brush rectifier, and which controls the electric blower and the brush DC motor and selectively switches the power conversion circuit and the AC power source. is there.

(Operation) In the vacuum cleaner of the first invention, when the AC power source is used as the power source, the electric blower and the brush DC motor are driven through the blower rectifier and the brush rectifier, and the secondary battery is used as the power source. In this case, the power converter circuit converts the direct current of the secondary battery into alternating current and boosts the voltage to almost commercial alternating current, and drives the electric blower and the brush direct current electric motor through the blower rectifier and the brush rectifier. Further, the electric blower and the brush DC motor are controlled by controlling the AC from the secondary battery through the commercial AC power source or the power conversion circuit that flows through the switch of the handle. Since the current can be reduced by boosting the voltage of the secondary battery by the power conversion circuit, the power loss can be reduced even if the switch is provided in the handle and the transmission path becomes long.

In the vacuum cleaner of the second invention, when the AC power source is used as the power source, the electric blower and the brush DC motor are driven via the blower rectifier and the brush rectifier, and the secondary battery is used as the power source. The power conversion circuit converts the direct current of the secondary battery into alternating current and boosts the voltage to almost commercial alternating current, and drives the electric blower and the direct current electric motor through the blower rectifier and the brush rectifier. Further, the electric blower and the brush DC motor are controlled by controlling the AC from the secondary battery through the commercial AC power source or the power conversion circuit that flows through the switch of the handle. Since the current can be reduced by boosting the voltage of the secondary battery by the power conversion circuit, the power loss can be reduced even if the switch is provided in the handle and the transmission path becomes long. Furthermore, when the power cord is not needed, the power cord can be removed from the handle, and the switch of the handle can selectively switch between the power conversion circuit and the AC power source.

(Example) Hereinafter, the structure of one example of the vacuum cleaner of the present invention will be described with reference to the drawings.

In FIG. 2, reference numeral 1 is a main body of the electric vacuum cleaner. The main body 1 of the electric vacuum cleaner has a substantially cylindrical main body case 2 having front and rear surfaces opened, and a front lid 3 for opening and closing the front opening of the main body case 2. , A rear lid 5 that opens and closes the rear opening 4 of the main body case 2. A handle 11 provided on a cylindrical support 10 is attached to the rear lid 5.

Further, the inside of the main body case 2 is formed in the center, and the communication port
It is divided into front and rear by a partition wall 13 having an opening formed therein, and the front of the partition wall 13 is a dust collecting part 14. On the other hand, behind the partition wall 13 in the main body case 2, an electric blower 15 having a DC motor with the suction side communicating with the dust collecting section 14 is arranged, and a flow is provided in front of the electric blower 15. A box-shaped battery storage chamber in which a diffuser 16 that diffuses air is opened toward the rear opening 4 of the main body case 2 behind the electric blower 15.
17 is formed, and a secondary battery 18 such as a lead storage battery is removably housed in the battery housing chamber 17.

Further, the handle 11 is provided with a switch 19 which is a switch for controlling the electric blower 15 inside, and an operating body 20 for operating the switch 19 is provided on the upper surface. Also, on the rear end of the handle 11, the flag of the power cord 21
A jack 23 is provided to which 22 is detachably connected. Further, inside the main body case 2, there is provided a circuit board 24 located below the electric blower 15 and having a control circuit mounted therein.

Further, the rear lid body 5 is attached to the main body case 2 with screws 27 or the like. The rear lid 5 has an exhaust port 28 communicating with the exhaust side of the electric blower 15.

On the front surface of the main body case 2, a locking claw portion 31 is formed at the upper end and an engagement receiving portion 32 is formed at the lower end. On the other hand, at the rear portion of the front side lid body 3, a locking tool 34 urged by a spring 33 is pivotally attached to the upper end, and an engaging portion 35 is projectingly formed at the lower end. Then, this engaging portion 35
Is rotatably engaged with the engagement receiving portion 32 of the main body case 2, and the locking tool 34 is disengageably engaged with the locking claw portion 31 of the main body case 2. The front lid 3 is locked to the unit 2. Further, the front lid 3 is formed with a cylindrical suction port 36 that faces the dust collecting portion 14, and the suction port 36 is tapered toward the rear side. Further, a jack 37 is provided on the front surface of the front lid body 3, and the jack 37 is electrically connected to the secondary battery 18 and the switch 19 via a lead wire 38 passing through the inside of the main body case 2. .

Further, a dust collecting filter 41 is removably inserted into the dust collecting portion 14, and the dust collecting filter 41 is held between the front lid 3 and the peripheral portion of the front surface of the body case 2 so that the dust collecting filter 41 can come in contact with and separate from the front lid 3. It is composed of a mouth frame 42 and a bag-shaped filter material 43 fixed to the mouth frame 42.

Further, 46 is a suction port body for the floor, and this suction port body 46 has a case body 48 having an opening formed with a dust suction port 47 on the lower surface, and the case body 48 rotates facing the dust suction port 47. Brush 49 is rotatably installed, and brush DC motor
50 are arranged. And this DC motor for brushes
An endless belt 53 for transmitting rotation is wound around a pulley 51 fixed to a rotating shaft of 50 and a pulley 52 fixed to a rotating brush 49.

A rotary pipe 54 is supported at the rear of the case body 48 so as to be vertically rotatable about a fulcrum 55, and a bent cylindrical connecting pipe 56 is circumferentially rotated at the rear of the rotary pipe 54. It is movably fitted and connected. The rear portion of the connecting pipe 56, that is, the exhaust side is tapered toward the rear, and the rear portion of the connecting pipe 56 has a suction port 36 of the vacuum cleaner body 1.
It is detachably taper-fitted therein, and the suction port 36 and the dust suction port 47 of the suction port body 46 are communicated with each other through the connection pipe 56 and the rotary pipe 54.

Further, the suction port body 46 is a connection cord electrically connected to the brush DC motor 50 and extending outward from the case body 48.
57 is provided, and a plug 58 that is detachably connected to the jack 37 of the electric vacuum cleaner body 1 is provided at the tip of the cord 57.
Is connected and fixed.

Next, the circuit of the above embodiment will be described with reference to FIG.

The first switching element 19a of the switch 19 from the commercial AC power source 61 through the power cord 21 and the power transmission path 62 wired in the handle 11.
And a rectifier 66 for a blower and a rectifier 67 for a brush via a first switching element 23a of the jack 23, the transmission paths 64, 65 and a second switching element 19b of the switch 19 via an electric transmission path 63. , Are connected in series via the electric power transmission path 68 and the power cord 21. The blower rectifier 66 is connected to the electric blower 15, and the brush rectifier 67 is connected to the brush DC motor 50.

In addition, the commercial AC power source 61 includes a power cord 21 and a transmission line 69.
Through the third switching element 19c of the switch 19 and the transmission line 70 to the one end of the primary winding 77 of the transformer 76 via the connection point between the transmission line 64 and the transmission line 65, and the other end of the primary winding 77. Is connected to a commercial AC power supply 61 via a power transmission path 68 and a power supply cord 21.
The secondary winding 78 of this transformer 76 is
The second switching element 23b of the jack 23 and the transmission line 8 via 79
The fourth switching element 19d of the switch 19 and the transmission line via 0
It is connected to one end of an oscillator 82 composed of a multivibrator via 81.

Further, a resistor 85, a resistor 86, a resistor 87 and a resistor 88 are connected from one end of the oscillator 82, a capacitor 89 is provided between the other ends of the resistors 85 and 86, and a resistor 89 is provided between the other ends of the resistors 87 and 88. The capacitor 90 is connected. The collector of the transistor 91 is connected to the connection point of the resistor 85 and the capacitor 89, the base of the transistor 91 is connected to the connection point of the resistor 87 and the capacitor 90, and the collector of the transistor 92 is connected to the connection point of the resistor 88 and the capacitor 90. 92 base is resistance
The connection point between 86 and capacitor 89 is connected.

Further, the collector of the transistor 91 is the base of the transistor 93, and the collector of the transistor 92 is the transistor 94.
Connected to the base of. The emitter of the transistor 91 and the emitter of the transistor 92 are connected together with the emitter of the transistor 93 and the emitter of the transistor 94 to the negative electrode of the secondary battery 18, and the positive electrode of the secondary battery 18 is connected to the secondary winding 78 of the transformer 76. This secondary winding connected to the midpoint of
One end of 78 is connected to the collector of transistor 93. Further, the other end of the secondary winding 78 of the transformer 76 is connected to the third switching element 23c of the jack 23 via the electric transmission path 95, and the collector or the anode of the transistor 94 is connected via the electric transmission path 96 to the transistor 91. , 92, 93, 94 and the cathode of the diode 97 connected between the positive electrode of the secondary battery 18 and the transmission line 98.
Selective switching connection is made via.

Then, the oscillator 82, the transistors 93, 94 and the transformer 76
For example, a power conversion circuit 99 that includes an inverter circuit that converts the direct current of the secondary battery 18 into alternating current
Are configured.

Also, jack 23 is for plug 22 of power cord 21.
It becomes the AC power supply side by inserting it in 23 and jack 23
Switch to the secondary battery side by removing the plug 22 from. Then, when the switch 19 is turned on, the first switching element
The switching element 19a and the second switching element 19b are closed, and when the switching element is turned off, the third switching element 19c and the fourth switching element 19d are closed.

Next, the operation of the circuit shown in FIG. 1 will be described.

First, by connecting the plug 22 to the jack 23 of the electric vacuum cleaner body 1, the first switching element 23a of the jack 23 is closed, the second switching element 23b is opened, and the third switching element 23c is transformed. The secondary winding 78 of the device 76 and the diode 97 are connected. And
When charging the secondary battery 18, turn off the switch 19,
Open the switching element 19a of the second, open the second switching element 19b, the third
The switching element 19c is closed and the fourth switching element 19d is opened. Then, from the commercial AC power supply 61 to the third switching element 19 of the switch 19.
A voltage is applied to the primary winding 77 of the transformer 76 via c, a stepped-down voltage is induced in the secondary winding 78, and the secondary battery 18 is charged by rectifying it with the diode 97.

Then, when driving the electric blower 15 and the brush DC motor 50, the switch 19 is turned on. As a result, AC is applied from the commercial AC power supply 61 to the blower rectifier 66 via the first switching element 19a of the switch 19, the first switching element 23a of the jack 23, and the second switching element 19b of the switch 19, The blower rectifier 66 rectifies and drives the electric blower 15, and an alternating current is applied to the brush rectifier 67. The brush rectifier 67 rectifies and drives the brush DC motor 50.

On the other hand, when the plug 22 from the jack 23 of the vacuum cleaner body 1 is removed, the first switching element 23a of the jack 23 is opened, the second switching element 23b is closed, and the third switching element 23c is The secondary winding 78 of the transformer 76 and the collector of the transistor 94 are connected. Then, when the electric blower 15 and the brush DC motor 50 are driven by the secondary battery 18, the switch 19 is turned on, the first switching element 19a is opened, and the second switching element 19b is closed. The switching element 19c is opened and the fourth switching element 19d is closed. Then, a voltage is applied from the positive electrode of the secondary battery 18 to the oscillator 82 of the power conversion circuit 99 via the second switching element 23b of the jack 23 and the fourth switching element 19d of the switch 19. Since the oscillator 82 constitutes a multivibrator, the transistor 91 and the transistor 92 are alternately turned on and off, and the base current is alternately passed to the base of the transistor 93 and the base of the transistor 94. As a result, the secondary winding 78 of the transformer 76 is provided with a current whose direction alternates by half, and a boosted AC voltage is induced in the primary winding 77.
The alternating current is rectified by the rectifier 66 for the blower to drive the electric blower 15, and the rectifier 67 for the brush is rectified to drive the brush DC motor 50.

In addition, if the first switching element 19a and the fourth switching element 19d of the switch 19 and the second switching element 19b and the third switching element 19c are not interlocked and separate switches are provided, the secondary battery 18 can be provided. It is possible to drive the electric blower 15 and the brush DC electric motor 50 while charging.

Further, if the blower rectifier 66 and the brush rectifier 67 are connected in parallel to the power source and each switch is provided, they can be individually controlled and driven.

According to the above-described embodiment, when the commercial AC power supply 61 is used, the blower rectifier 66 and the brush rectifier 67 are used, and when the secondary battery 18 is used, the power conversion circuit 99 is used to convert the AC into almost AC power. After boosting the voltage to a voltage, the electric blower 15 is again used by using the blower rectifier 66 and the brush rectifier 67.
And the DC motor 50 for brushes are driven.
Can be commonly used to save parts and the like, and current can be passed through the transmission path 65 at high voltage and low current, so that power loss is reduced.

Further, since the power cord 21 is provided on the rear side of the handle, it is not necessary to step on the power cord 21 during operation.

〔The invention's effect〕

According to the electric vacuum cleaner of the first aspect of the present invention, since the voltage of the secondary battery is boosted by the power conversion circuit, even if a switch is provided on the handle, a small power loss can be achieved. The vacuum cleaner makes it easier to operate the vacuum cleaner.

Further, since the electric blower and the brush DC motor are provided with the blower rectifier and the brush rectifier, respectively, a common power source is used, so that the number of parts can be reduced.

According to the electric vacuum cleaner of the second aspect of the present invention, since the voltage of the secondary battery is boosted by the power conversion circuit, a small power loss can be achieved even if a switch is provided in the handle, and the opening and closing of the handle The vacuum cleaner makes it easy to operate the vacuum cleaner, and the power supply for both direct and direct use can be used. The power cord is detachable from the handle, so it is easy to handle and the range where the power cord does not reach can be easily cleaned.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the electric vacuum cleaner of the present invention,
FIG. 2 is a perspective view of the same. 1 ... Vacuum cleaner main body, 11 ... Handle, 14 ... Dust collector, 15
...... Electric blower, 18 …… Secondary battery, 19 …… Switch that is a switch, 21 …… Power cord, 50 …… Brush DC motor, 66 …… Blower rectifier, 67 …… Brush rectifier, 99
...... Power conversion circuit.

Claims (2)

[Claims] 1. An electric vacuum cleaner main body having a built-in electric blower having a DC electric motor and a secondary battery and provided with a dust collecting portion communicating with the electric blower; and a handle attached to the electric vacuum cleaner main body. A suction port body provided on the suction side of the dust collecting portion of the electric vacuum cleaner body and having a built-in brush DC motor for driving a rotating brush with the brush DC motor; and a secondary battery connected to the secondary battery. A power conversion circuit that includes an inverter circuit that converts the direct current into an alternating current to a voltage of almost a commercial alternating current, a blower rectifier that is connected to the electric blower and rectifies the output of the power conversion circuit, and the brush direct current motor. A brush rectifier that is connected and rectifies the output of the power conversion circuit; and a power conversion circuit, the blower rectifier, and the brush rectifier that are disposed in the handle. Is connected between an electric vacuum cleaner, characterized in that a switch for controlling the electric blower and the DC motor brushes. 2. An electric vacuum cleaner main body having a built-in electric blower having a DC electric motor and a secondary battery, and provided with a dust collecting portion communicating with the electric blower; and a handle attached to the electric vacuum cleaner main body. A power cord detachably connected to the handle; and a suction port body provided on the suction side of the dust collecting part of the vacuum cleaner body, which has a built-in brush DC motor and drives the rotating brush with the brush DC motor. A power conversion circuit that is connected to the secondary battery and that includes an inverter circuit that converts the direct current of the secondary battery into an alternating current, and that boosts the voltage to approximately commercial alternating current voltage; and rectifies the output of the power conversion circuit that is connected to the electric blower. A blower rectifier, a brush rectifier that is connected to the brush DC motor and rectifies the output of the power conversion circuit, and is disposed in the handle, the power conversion circuit and the A switch that is connected between the blower rectifier and the brush rectifier and that controls the electric blower and the brush DC motor and that selectively switches between the power conversion circuit and the AC power source. Vacuum cleaner.