JPH08131380A - Vacuum cleaner - Google Patents

Abstract

PURPOSE: To provide a vacuum cleaner in which the number of connection wires between a main body part and a hand operating section is small and the power is easily adjustable. CONSTITUTION: A main control circuit is connected to a hand operating circuit 10a with two conductors A and B and the hand operating circuit is provided with a 'stop' switch K1 , a 'weak' switch K2 and a 'strong' switch K3 . When the 'weak' switch K2 is turned on, transistors Q2 and Q4 are turned on and a half wave of an alternating current is fed to the conductors A and B at a positive half cycle thereof in the conductor A. When the 'strong' switch K3 is turned on, the transistors Q2 and Q4 are turned on and a half wave of an alternating current is fed to the conductors A and B at a positive cycle thereof in the conductor B. In this manner, the size of ignition phase angle of current for motor driving is switched with the main control circuit depending on which of the half waves is fed to the conductors A and B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vacuum cleaner, and more particularly to an electric vacuum cleaner devised to reduce wiring between a main body and a hand-operated portion.

[0002]

2. Description of the Related Art A generally well-known vacuum cleaner is a suction motor, a main body having a drive control circuit for the motor, a suction nozzle, and a bellows hose connecting the suction nozzle and the main body. And a hose part consisting of an extension pipe, and a handy operation part is equipped with a start-up on / off switch, a volume for adjusting power, and a push button for switching.

In this type of vacuum cleaner, the main control circuit of the main body part and the electric circuit part of the hand operation part are provided with two conductors for power supply and two conductors for signal supply, for a total of four conductors. The four tubes are arranged inside the bellows hose.

[0004]

In the above-mentioned conventional electric vacuum cleaner, power adjustment is often continuous and continuously variable adjustment by the volume. However, in the case of household use, the householder often does not know the optimum power for the object to be cleaned, sometimes cleaning with high power, when the curtain etc. is abruptly sucked into the nozzle or brush, I often changed to low power in a hurry. In order to avoid this, the power adjustment can be performed by step switching using push buttons, but as described above, it is necessary to connect the main body section and the hand operation section with four conducting wires, which results in a relatively high production cost. In addition, there is a problem that it is heavy and inconvenient for an old man, a child or the like to swing around and clean.

The present invention has been made in view of the above problems, and an object thereof is to provide an electric vacuum cleaner in which power adjustment is easy and the number of connecting conductors between the main body portion and the hand operation portion is small. I am trying.

[0006]

The vacuum cleaner of the present invention is provided with a suction motor, a bidirectional three-terminal thyristor for driving the suction motor, and a point of the bidirectional three-terminal thyristor. A main control circuit comprising a main control circuit section including a firing pulse generating circuit for generating a firing pulse for arcing, and a hand operation section having a switch for activating the main control circuit section, Section and the hand operation section are connected to each other, and a two-wire conducting wire for supplying an AC power supply voltage from the main control circuit to the hand operation section is provided, and the hand operation section has a first switch for selecting a weak operation, and a strong operation. Of the second switch for selecting the first switch and the first energizing circuit for flowing the positive or negative polarity of the AC power supply to the conductor of the two wires in response to the operation of the first switch. Respond to the operation A second energizing circuit for energizing the two-wire conducting wire with a current having a polarity opposite to that of the current passed by the first energizing circuit. A first current detection circuit that detects that a current has flowed, a second current detection circuit that detects that the opposite polarity current has flowed to the two conductors, and a current detection of the first current detection circuit A first ignition pulse generating circuit for generating an ignition pulse for energizing the bidirectional three-terminal thyristor over a predetermined first phase angle in response to an output; and the second ignition pulse generating circuit.
In response to the current detection output of the current detection circuit, the bidirectional three-terminal thyristor has a second phase larger than the first phase angle.
Second firing pulse to energize over the phase angle of
The firing pulse generation circuit of is provided.

In this electric vacuum cleaner, when the first switch of the hand operation unit is operated, the two conductors connecting the main control circuit unit and the hand operation unit have only one of positive and negative polarities (for example, positive). Current is supplied by the first energizing circuit. This current is detected by the first current detection circuit, and in response, an ignition pulse having a small phase angle is generated by the first ignition pulse generation circuit and is applied to the bidirectional three-terminal thyristor. Is arced. In this case, since the firing phase angle is small, the power of the motor is “weak”.

Next, when the second switch, not the first switch, is operated, a current having only the opposite polarity (for example, negative) is applied to the two conducting wires by the second energizing circuit. This current is detected by the second current detection circuit, and in response to this, an ignition pulse larger than the first phase angle is generated by the generation of the second ignition pulse circuit and is added to the bidirectional three-terminal thyristor. And is fired. In this case, since the firing phase angle is large, the power of the motor is “strong”.

In this vacuum cleaner, two lines are used to supply AC power from the main control circuit to the hand operation unit and to transmit "strong" and "weak" power selection signals from the hand operation unit to the main control circuit. Since it is shared by the conducting wires, only two conducting wires are required to connect the main control circuit and the hand operation unit.

[0010]

The present invention will be described in more detail with reference to the following examples. FIG. 4 is a diagram showing an external appearance of an electric vacuum cleaner in which the present invention is implemented. This vacuum cleaner has a main body 41
, The bellows hose 42, the hand operation part 43, and the extension tube 44
And a T-shaped suction part 45. Body part 4
1 includes a suction motor, a main control circuit, a dust collecting bag, and the like.

On the surface of the hand operation unit 43, a "stop" switch K ₁ , a "weak" switch K ₂ and a "strong" switch K are provided.
₃ is provided, and the circuit section is housed inside. Two conductors A and B are stretched in the bellows hose portion 42, and the two conductors A and B connect the hand operation circuit 10a and the main control circuit 10b as shown in FIG. There is. These two conducting wires A and B are connected to an AC plug 10c which is connected to a commercial AC power source, and are connected to the main control circuit 10b.
AC voltage is supplied to the hand operation unit 10a via the hand operation circuit 10a and "stop", "weak", "strong" from the hand operation circuit 10a.
For supplying a positive polarity or negative polarity current for the selection by the main control circuit.

FIG. 2 shows the circuit connection of the hand operation circuit 10a.
It is a circuit diagram shown. IC1 is a circuit with two flips.
A stop switch K₁One end of
Iodo d₁RS of IC1 via₁Connected to terminals
Together with the diode d₆Via RS₂Connected to the terminal
"Weak" switch K₂One end of the diode d₂Through
Also the RS of IC1₁It is connected to the terminal and
Iodo d_FourVia ST₂Connected to the terminals,
Itch K₃One end of the diode d₃Through S of IC1
T₁It is connected to the terminal and the diode d_FiveThrough
IC1 RS ₂It is connected to the terminal. switch
K₁, K₂, K₃And the other end of₁₆And
Indexer C₂Is connected to the connection point of.

The set output terminal O ₁ of IC1 is connected to the base of an NPN transistor Q ₁ via a resistor R ₆ , and the set output terminal O ₂ is connected to the base of an NPN transistor Q ₂ via a resistor R _8. It is connected to the. The emitter of the transistor Q ₁ is connected to the base of the transistor Q ₁ via the resistor R _7, and is connected to the power supply line b via the light emitting element L ₁ . The emitter of the transistor Q ₂ is also connected to its own base via the resistor R ₉ and is also connected to the power supply line b via the light emitting element L ₂ . The light emitting element L ₁ lights up when the “strong” switch K ₃ is turned on,
The light emitting element L ₂ lights up when the “weak” switch K ₂ is turned on.

Transistor Q₁Is a resistor R_TenTo
Through PNP type transistor Q₃Connected to the base of
Transistor Q₂Is a resistor R₁₁Through
PNP type transistor Q_FourConnected to the base of
It Transistor Q₃, Q_FourCommon collector
Transistor Q connected to the gate of the transistor 4₃Emi of
Resistance is resistance R₁₂Connected to your own base via
And the resistance R₁₄, Diode d₇Connected to conductor B via
Has been done. Transistor Q_FourThe emitter of the resistor as well
R₁₃Is connected to its own base via
R_Fifteen, Diode d ₈Connected to conductor A via
It

The conductors A and B are connected to the input terminal of the rectifier circuit 2, the (+) output terminal a of the rectifier circuit 2 is connected to the anode of the thyristor 4, and the (-) output terminal c is connected. A series circuit of a resistor R ₁₆ and a capacitor C ₂ is connected therebetween, and a zener diode ZD ₁ and a resistor R ₁₈ are further connected in parallel to the capacitor C _2, and the terminal voltage of the resistor R ₁₈ is used as a power supply voltage for the IC 1 and the switch. It is provided at a common connection point of K ₁ , K ₂ and K ₃ . A parallel circuit of a resistor R ₁₇ and a capacitor C ₄ is connected between the cathode and the gate of the thyristor 4, and a capacitor C ₃ is connected between the cathode of the thyristor 4 and the power supply line c. The voltage across the capacitor C ₃ is the dust sensor 3 Is given to.

FIG. 3 is a circuit diagram showing the circuit connection of the main control circuit 10b. In FIG. 3, the conductor R has a resistance R
₂₁ and a resistance R ₃₈ connected in series to the conductor B. One end of the resistor R ₂₂ to the load side end of the resistor R ₂₁ is connected to the AC power plug end of the resistor R _21, a thyristor 11
Is connected to the cathode of the thyristor 11, a parallel circuit of a resistor R ₂₃ and a capacitor C ₂₁ is connected between the cathode and the gate of the thyristor 11, and the other end of the resistor R ₂₂ is connected to the gate of the thyristor 11.

The anode of the thyristor 11 has resistors R ₂₄ and R
₂₈ is connected to the base of the PNP-type transistor Q ₂₂ through, whereas the base of the transistor Q ₂₂ is connected to its emitter via a resistor R _29, diodes d ₂₂ between the collector and the emitter is connected, the collector Is connected to the emitter of a PNP type transistor Q ₂₄ via a resistor R ₃₀ .

Transistor Q_{twenty four}The emitter and DC power supply
Capacitor C between in e_{twenty five}Connected to the
Resistance R between d and e₃₅And resistance R₃₆Series circuit and resistor R
₄₂, And the series circuit of thyristor 13 is connected in parallel.
Has been done. Transistor Q _{twenty four}The base of diode d
₂₇Through the resistor R₃₅And resistance R₃₆Connected to the connection point of
Transistor Q_{twenty four}The collector is a resistor R₄₀And the diode
d₂₆Connected to the gate of thyristor 13 via
It A resistor R is provided between the gate and cathode of the thyristor 13.₄₁When
Capacitor C₂₇Parallel circuit is connected.

Resistance R_{twenty four}And resistance R₂₈Is a resistor R₂₆To
Through PNP type transistor Q_{twenty one}Connected to the base of
Transistor Q_{twenty two}Emitter, diode d_{twenty two}Mosquito
Sword, resistance R₂₉Point f at one end of the transistor and the transistor Q
_{twenty one}Diode d between the emitters of _{twenty one}But the connection point f and
Jista Q_{twenty one}Resistance R between the bases of_{twenty five}And capacitor C_{twenty three}Average
The column circuit is connected, the connection point f and the resistor R_{twenty four}And resistance R₂₆of
Capacitor C between the connection points _{twenty two}Are connected. Also,
Langista Q_{twenty one}The collector is a resistor R₂₇Through the siri
It is connected to the gate of the star 13.

[0020] One end of a resistor R ₃₇ to the load side end of the resistor R ₃₈ is connected thyristors 1 to the AC power plug end of the resistor R ₃₈
Two cathodes are connected, a parallel circuit of a resistor R ₃₉ and a capacitor C ₂₆ is connected between the cathode and the gate of the thyristor 12, and the other end of the resistor R ₃₇ is connected to the gate of the thyristor 12. The anode of the thyristor 12, the resistance R _33, is connected via the R ₃₁ to the base of the PNP-type transistor Q _23, the base of the transistor Q ₂₃ is connected through a resistor R ₃₂ to its emitter, collector and emitter While the diode d ₂₅ is connected to the diode d ₂₅ , the collector is connected to the emitter of the transistor Q ₂₄ via the resistor R ₃₄ . The emitter of the transistor Q ₂₃ is connected to the (+) output terminal d of the rectifier circuit 15, and this output terminal d and the connection point f
A diode d ₂₄ having the output terminal d side as an anode is connected in between, and a diode d ₂₃ is connected between the connection point f and the AC power source plug side of the conductor B.

Between the AC power supply terminals C and D, a series circuit of a suction motor 16 and a bidirectional three-terminal thyristor 14,
The surge absorber 17 and the capacitor C ₃₀ are connected in parallel, the cathode of the bidirectional three-terminal thyristor 14 is connected to one power supply terminal D, and the resistor R is connected between the anode and the cathode of the bidirectional three-terminal thyristor 14. A series circuit of ₄₄ and capacitor C ₂₉ is connected. In addition, a resistor R is provided between the gate and the cathode of the bidirectional three-terminal thyristor 14.
The parallel circuit of ₄₃ and the capacitor C ₂₈ is connected, and the anode and cathode of the bidirectional three-terminal thyristor 14 are the rectifier circuit 1.
5, and the direct current (+) (-) both output terminals d and e of the rectifier circuit 15 are connected to the anode of the diode d _{24 and} the cathode of the thyristor 13.

Next, the operation of the vacuum cleaner of the embodiment will be described. When the "weak" switch K ₂ of the hand operation circuit 10a is turned on, a reset signal to the RS ₁ terminal of IC1 is also is input a set signal to the ST ₂ terminal, O ₂ pin is "high", the O ₁ terminal It becomes “low”. When the O ₂ terminal is high, the transistor Q ₂ is turned on and the light emitting element L ₂ is turned on. When the transistor Q ₂ is turned on, the transistor Q ₄
Turns on. Then, in the half cycle in which the conductor A is positive, the diode d ₈ , the resistor R ₁₅ , the transistor Q ₄ , and the resistor R ₁₇
A current flows through the parallel circuit of the capacitor C ₄ and the capacitor C ₄ to turn on the thyristor 4. Capacitor C ₄ also holds the next half cycle of the charging voltage, keeping thyristor 4 on. Therefore, the DC output voltage of the rectifier circuit 2 is supplied to the dust sensor 3. The DC output of the rectifier circuit 2 is, of course, through the resistor R ₁₆ and always IC ₁ and the key switch K ₁ ,
It is supplied to K ₂ and K ₃ .

When the "strong" switch K ₃ is turned on, the IC
The second flip-flop of 1 is reset and the first flip-flop is set. Therefore, the output O ₁ terminal is “high”, the output O ₂ terminal is “low”, the transistor Q ₁ is turned on, the transistor Q ₃ is also turned on, and the diode d ₇ and the resistor R ₇ are turned on during the positive half cycle of the conductor B. ₁₄ ,
Transistor Q _1, the light-emitting element L ₁ and the current light-emitting element L ₁ flows is turned on. When the transistor Q ₃ is turned on and the terminal voltage of the resistor R ₁₇ is increased, the thyristor 4 is turned on, the power supply voltage is supplied to the dust sensor 3, and the charging voltage of the capacitor C ₄ turns on the thyristor 4 for the next half cycle. Is maintained.

When the "stop" switch K ₁ is turned on, the IC
Both flip-flops 1 are reset, both output terminals O ₁ and O ₂ become low, both transistors Q ₁ and Q ₂ are off, and neither light emitting element L ₁ nor L ₂ lights up. Of course, since the transistors Q ₃ and Q ₄ are not turned on, the thyristor 4 is not turned on either. Therefore, the power supply voltage is not supplied to the dust sensor 3.

In the main control circuit 10b, the hand operation circuit 10
When the "weak" switch K ₂ of a is turned on, the transistor Q ₂ of the hand operation circuit 10a is turned on, conductor A positive and becomes half cycle only lead A, current flows in the B, and the resistor R ₃₈ A current flows from the conductor B to the terminal D, and conversely, a current flows from the terminal C to the conductor A in the resistor R ₂₁ . Therefore, in the thyristor 11, the voltage of the resistor R ₂₁ is negatively applied to the gate and does not turn on, but in the thyristor 12, the voltage of the resistor R ₃₈ is positively applied to the gate and is turned on. By turning on the thyristor 12, the base of the transistor Q ₂₃ becomes a low potential relative to the emitter, the transistor Q ₂₃ is turned on,
The capacitor C ₂₅ is charged via the resistor R ₃₄ . When the charging voltage of the capacitor C ₂₅ exceeds a predetermined value, the transistor Q ₂₄ is turned on, and the predetermined voltage is given to the gate of the thyristor 13 via the resistor R ₄₀ and the diode d ₂₆ , so that the thyristor 13 is turned on. By this turning on, the rectifier circuit 1
An ignition pulse is applied to the gate of the bidirectional three-terminal thyristor 14 via 5, and the bidirectional three-terminal thyristor 14 is turned on. When the bidirectional three-terminal thyristor 14 is turned on, the motor 16 is driven. Where thyristor 13
Since the timing of turning on, that is, the timing (phase angle) of issuing the ignition pulse is determined by the time constant of the resistor R ₃₄ and the capacitor C ₂₅ , the time constant is set in advance to a relatively small phase angle that does not cause full firing. By making the settings, the motor 16 operates in “weak” mode.

"Strong" switch K _{3 of the} hand operation circuit 10a
Is turned on, the transistor Q of the hand operation circuit 10a
_{Since 1} is turned on, the current flows through the conductors A and B only in the half cycle in which the conductor B becomes positive (the conductor A becomes negative), and the resistance R
₃₈ in the direction from terminal D to conductor B, and resistor R ₂₁ in conductor A
A current flows from the terminal to the terminal C. Therefore, the thyristor 12 does not turn on, but the thyristor 11 turns on. When the thyristor 11 is turned on, the base of the transistor Q _{22 has} a low potential with respect to the emitter, and the transistor Q _{22 has} a low potential.
₂₂ is turned on, and the capacitor C ₂₅ is charged via the resistor R ₃₀ . When the charging voltage of the capacitor C ₂₅ reaches a predetermined value, the transistor Q ₂₄ also turns on, and accordingly the thyristor 13
Is turned on and an ignition pulse is generated. But here
Even though the "strong" switch K ₃ is on
To prevent sudden strong operation, the time constants of the resistor R ₃₀ and the capacitor C ₂₅ are set to values at which the firing phase angle does not reach full firing.

On the other hand, when the thyristor 11 is turned on, the capacitors C ₂₂ and C ₂₃ are charged. However, since the time constants of the resistor R ₂₅ and the capacitor C ₂₃ are large, the transistor Q ₂₁ is turned on in half cycle charging. Absent. However, after several cycles of charging, the transistor Q ₂₁ turns on. As a result, the gate of the thyristor 13 is forced to a high potential via the transistor Q ₂₁ and the resistor R ₂₇ , the thyristor 13 is turned on at a phase angle close to full firing, and a firing pulse is generated. This completes the bidirectional three-terminal thyristor 14.
Is also turned on, and the motor 16 shifts to “strong” operation. That is, in this embodiment, even if the switch for "strong" operation is selected, a slow start method is adopted in which "weak" or "medium" operation is performed for a short period of time, and then "strong" operation is performed. We are trying to prevent the occurrence of defects due to.

Although the firing pulse generating circuit using the thyristor is shown in the above embodiment, another well-known firing pulse generating circuit may be used such as replacing the thyristor with a transistor.

[0029]

According to the present invention, there are provided two lines for supplying power from the main control circuit unit to the hand operation unit and two lines for transmitting a signal for power switching from the hand operation unit to the main control circuit unit. Since it is shared, it is possible to obtain a vacuum cleaner with a power control that is push button-controlled with a lightweight and inexpensive intake hose.

Further, it is a push button type having three steps of "strong", "weak", and "stop", and it can be easily operated even by a weak person such as an old man or a child.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an electric circuit of an electric vacuum cleaner according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a circuit connection of a hand operation circuit of the electric vacuum cleaner of the embodiment.

FIG. 3 is a circuit diagram showing a circuit connection of a main control circuit of the electric vacuum cleaner of the embodiment.

FIG. 4 is a diagram showing an appearance of the electric vacuum cleaner of the embodiment.

[Explanation of symbols]

10a Hand operation circuit K ₁ Stop switch K ₂ Weak switch K ₃ Strong switch Q ₁ , Q ₂ , Q ₃ , Q ₄ Transistor A, B Conductor

Claims (4)

[Claims] 1. A suction motor, a bidirectional three-terminal thyristor for driving the suction motor, and a firing pulse for generating a firing pulse for firing the bidirectional three-terminal thyristor point. In a vacuum cleaner including a main control circuit unit including a generation circuit and a hand operation unit having a switch for activating the main control circuit unit, the main control circuit unit and the hand operation unit are connected to each other, and A first switch for selecting a weak operation is provided on the hand operation unit, the conductor having two wires for supplying an AC power supply voltage from the control circuit to the hand operation unit,
A second switch for selecting a strong operation; a first energizing circuit that causes a positive or negative polarity of an AC power source to flow through the two wires in response to an operation of the first switch;
In response to the operation of the switch, a second energizing circuit that energizes the two-wire conducting wire with a current having a polarity opposite to that of the current passed by the first energizing circuit is provided. A first current detection circuit for detecting that the current of one polarity has flowed in the conducting wire, a second current detection circuit for detecting that the current of the opposite polarity has flowed in the conducting wire of the two wires, and A first ignition pulse generation circuit for generating an ignition pulse for energizing the bidirectional three-terminal thyristor over a predetermined first phase angle in response to the current detection output of the first current detection circuit; Second ignition pulse in response to the current detection output of the current detection circuit, which generates an ignition pulse for energizing the bidirectional three-terminal thyristor over a second phase angle larger than the first phase angle. An electric vacuum cleaner having a generating circuit. 2. A third ignition pulse generating circuit for generating an ignition pulse for energizing the bidirectional three-terminal thyristor over a third phase angle smaller than the second phase angle, the second current. It starts in response to the current detection output of the detection circuit,
Until the time is up, the bidirectional three-terminal thyristor is ignited by the ignition pulse of the third ignition pulse generating circuit, and in response to the time up, the second ignition pulse generating circuit The vacuum cleaner according to claim 1, further comprising a timer circuit for firing the bidirectional three-terminal thyristor with a firing pulse. 3. The vacuum cleaner according to claim 2, wherein the second phase angle causes the bidirectional three-terminal thyristor to fully ignite. 4. A first display unit that displays a message to the effect that the first energizing circuit operates in response to the operation of the first energizing circuit, and a message that displays that effect in response to the operation of the second energizing circuit. The vacuum cleaner according to claim 1, wherein the vacuum cleaner is provided with a second display unit that operates.