JPH10243900A - Electric vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric vacuum cleaner which can maintain the suction force corresponding with the increase of refuse by a simple control circuit of a small-sized constitution. SOLUTION: A full wave rectified voltage of an AC power source 17 is applied to a charging circuit 26 equipped with a resistor circuit 24, a variable resistor 23 of an at-hand operation part, and a condenser 25 to charge the condenser 25, and the charging voltage is input to the emitter of a transistor 27, and also, the voltage for which a rectified voltage is divided by a resistor 28 and a resistor 29, is input to a base as a reference voltage, and by a turning on of the transistor 27 at the time when the charging voltage exceeds the reference voltage, a trigger is output of the gate of a two-directional thyristor 18 through a transistor 36 and a photo-triac coupler 34, and by a phase of its timing, power is fed to an electric blower 2. When refuse is accumulated in a dust collecting chamber, and a negative pressure becomes a specified value, a pressure switch 42 shortcircuits the resistor 40 of a resistor circuit 24, and the charging time constant is made smaller, and the phase is quickened, and the input to the electric blower 2 is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cleaner for controlling a suction force by detecting a pressure in a dust collecting chamber.

[0002]

2. Description of the Related Art A conventional vacuum cleaner will be described below. Conventionally, this kind of vacuum cleaner is disclosed in Japanese Patent Application Laid-Open No. 1-12982.
The configuration disclosed in Japanese Patent Application Laid-Open No. 2 (1993) -212 was common.

FIG. 15 is a partial cross-sectional external view showing the structure of a vacuum cleaner. In the figure, 1 is a vacuum cleaner main body, 2 is an electric blower for collecting dust, 3 is a suction port, 4 is a hose, 5 is a hand operating section, 6 is an extension pipe, 7 is a suction tool, 8
Is a dust collection chamber.

FIG. 16 is a circuit diagram showing a configuration of a conventional vacuum cleaner. In the figure, 9 is a pressure sensor for detecting a decrease in pressure on the side of the electric blower 2 from the dust collection chamber 8 in the vacuum cleaner main body 1, and 10 is a pressure sensor whose time constant is determined by resistors 11a, 11b, 11c and 11d. 9 are differentially detected operational amplifiers, 12a, 12b and 13 are electrolytic capacitors for preventing noise, respectively, and 14a, 14b and 14c are respectively predetermined reference voltages and operational amplifiers 1 and 2.
Voltage comparators 15a and 15 for comparing with an output voltage of 0
b, 15c are voltage comparators 14a, 14b, 1
A PNP transistor controlled by the output signal of 4c,
Reference numeral 16 denotes a control hand volume for setting the output of the vacuum cleaner.

The operation of the above configuration will be described.
The output voltage of the pressure sensor 9 is changed to resistances 11a, 11b, 11
The suction pressure of the vacuum cleaner is detected while amplifying by a differential amplifier circuit constituted by c and 11d and an operational amplifier 10, and the detected output is detected by voltage comparators 14a and 14b.
14c. Further, the voltage comparator 14a,
The non-inverting inputs of 14b and 14c have 14a <14b <14
A voltage set to be c is applied. As a result, the detection output decreases, and the output of the operational amplifier 10 becomes the voltage comparator 1
When the voltage exceeds the set voltage of 4a, the output of the electric blower 2 is increased by changing the value on the set value side of the control hand-held volume 16 by the output of the voltage comparator 14a. When the pressure further decreases and the output voltage of the operational amplifier 10 further increases and exceeds the set voltage of the voltage comparator 14b, the output of the voltage comparator 14b is also added, and the output of the electric blower 2 further decreases, and the pressure further decreases. When the output voltage of the operational amplifier 10 further rises, the output of the voltage blower 14c is added, and the output of the electric blower 2 further rises.

[0006] The above operation compensates for a reduction in suction force due to clogging of the dust collection filter.

[0007]

In such a conventional vacuum cleaner, since a semiconductor pressure sensor 9 is used, the output must be amplified by an operational amplifier 10 or the like. For example, there is a problem that the configuration of the control circuit becomes complicated, the shape becomes large, and the reliability is reduced.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a vacuum cleaner having a simple configuration, a small size, and a highly reliable control circuit.

[0009]

According to the present invention, when power is supplied from an AC power supply to an electric blower by phase control, the resistance value is switched by a pressure switch that opens and closes at a predetermined negative pressure in a dust collection chamber. A charging circuit for charging a capacitor with a rectified voltage of the AC power supply through a resistor circuit provided and a variable resistor provided in a hand operation unit; and comparing the charging voltage of the capacitor with a reference voltage based on the rectified voltage. And a trigger circuit for determining a control timing, wherein an input to the electric blower is controlled by switching a resistance value of the resistance circuit by the pressure switch in accordance with a negative pressure in the dust collection chamber. It is a vacuum cleaner.

With this arrangement, when dust accumulates in the dust collection chamber and the negative pressure becomes a predetermined negative pressure, the resistance value of the resistance circuit in the charging circuit is switched to a small value, whereby the timing of the phase control is advanced and the electric motor is driven. The suction force can be controlled to be increased by increasing the input to the blower, and the suction force can be maintained with a simple and small circuit. In addition,
The above operation is reversible to negative pressure.

According to a second aspect of the present invention, a plurality of pressure switches having mutually different sensitive pressures are provided, and the resistance value of the resistance circuit is switched stepwise according to the negative pressure in the dust collection chamber. 1 is a vacuum cleaner according to 1.

Thus, the electric blower can be controlled more precisely. According to a third aspect of the present invention, there is provided a resistance circuit in which, when power is supplied from an AC power supply to an electric blower by phase control, a resistance value is continuously changed by a pressure-actuated variable resistor that is sensitive to a predetermined negative pressure in a dust collection chamber. And a charging circuit for charging a capacitor with a rectified voltage of the AC power supply via a variable resistor provided in the hand operation unit; and a timing of the phase control by comparing the charged voltage of the capacitor with a reference voltage based on the rectified voltage. And a trigger circuit for determining the input voltage to the electric blower by continuously changing the resistance value of the resistance circuit by the pressure-operated variable resistor corresponding to the negative pressure in the dust collection chamber. It is a vacuum cleaner.

Accordingly, when dust accumulates in the dust collection chamber and the negative pressure increases, the resistance value of the resistance circuit in the charging circuit is continuously changed to a small value, whereby the timing of the phase control is sequentially made earlier. However, as the negative pressure increases, the input to the electric blower can be increased to increase the suction force, and the suction force can be maintained with a simple and small circuit.

According to a fourth aspect of the present invention, a temperature detecting element whose resistance changes with the temperature in the vacuum cleaner main body is provided in the resistance circuit, and the input of the electric blower is controlled according to the temperature of the vacuum cleaner main body. An electric vacuum cleaner according to any one of claims 1 and 2, wherein

[0015] Thus, when the temperature inside the main body of the vacuum cleaner rises by using the vacuum cleaner for a long time, the input to the electric blower is reduced, and the load on the electric blower is reduced to suppress the temperature rise. Can be.

According to a fifth aspect of the present invention, there is provided a vacuum cleaner according to any one of the first and second aspects, wherein the pressure switch is opened and closed at a negative pressure when the air volume is higher than the maximum suction power. is there.

Thus, when the negative pressure increases and the input to the electric blower is increased by the pressure switch, the electric blower can be operated at the maximum suction power.

According to a sixth aspect of the present invention, the resistance circuit includes a semi-fixed resistor, and the input to the electric blower when the resistance value of the variable resistor of the hand operation unit is set to zero is set to a predetermined value by the semi-fixed resistor. An electric vacuum cleaner according to any one of claims 1 to 5, wherein the electric vacuum cleaner is set.

Thus, it is possible to absorb the characteristic variation of the electric blower and set so that the suction force for each vacuum cleaner does not vary.

According to a seventh aspect of the present invention, there is provided a vacuum cleaner according to any one of the first to sixth aspects, wherein a voltage obtained by clipping a resistance-divided voltage of a rectified voltage of an AC power supply with a Zener diode is used as a reference voltage.

Thus, it is possible to improve a change in input to the electric blower when the frequency of the AC power supply changes.

The present invention according to claim 8 is the vacuum cleaner according to any of claims 1 to 6, wherein a voltage obtained by dividing a rectified voltage of an AC power supply by an inductance and a resistance is used as a reference voltage.

Thus, it is possible to set so that the input to the electric blower does not change even if the frequency of the AC power supply changes.

[0024]

In the present invention according to the first aspect, the rectified voltage of the AC power supply means a non-smooth unidirectional voltage having a full-wave rectified waveform or a half-wave rectified waveform.
In the embodiment, a full-wave rectified voltage is used. Also, the charging circuit is connected in series with a variable resistor provided in the hand operation unit, a resistor circuit including a plurality of resistors and a pressure switch, and a capacitor,
A circuit for charging the capacitor with the rectified voltage. The reference voltage means a voltage obtained by dividing the rectified voltage by resistance division. The trigger circuit means a circuit that determines a timing for giving a phase angle for controlling a phase of an AC voltage applied to the electric blower, and is a unit that outputs a trigger at a timing based on the charging voltage of the capacitor and the reference voltage. .

This means means for outputting a trigger at the intersection of the level of the integrated waveform of the full-wave rectified waveform and the level of the reference voltage waveform obtained by dividing the full-wave rectified waveform. In addition,
It is apparent from the characteristics of the waveform that the levels do not cross unless the reference voltage is a divided voltage of the full-wave rectified voltage. In the embodiment, the reference voltage and the charging voltage are respectively applied to the base and the emitter of the transistor, the voltages are compared, and a trigger is output at a matching timing. Since the level of the charging voltage waveform of the capacitor changes according to the charging time constant, the trigger timing at the intersection, that is, the control phase, can be changed by switching the resistance value of the resistance circuit by the pressure switch. According to the first aspect of the present invention, the dust (dust) accumulates in the dust collection chamber and the pressure (negative pressure) rises. When the pressure reaches a predetermined pressure, the pressure switch is switched to reduce the resistance value of the resistance circuit, and the control phase is advanced. To increase the input to the electric blower.

A phototriac coupler is interposed between the output of the transistor and the gate of a bidirectional thyristor for phase-controlling the input to the electric blower, and a trigger is output via optical coupling. I have.

In the present invention according to claim 2, the sensitive pressure means the pressure at which the pressure switch switches.
A plurality of pressure switches having different sensitive pressures are provided, and the resistance value of the resistance circuit is switched stepwise.

In the present invention according to claim 3, the pressure-actuated variable resistor means an element whose resistance value changes with pressure, and for example, a pressure-sensitive element using a semiconductor can be used. The resistance value of the resistance circuit is determined by the pressure (negative pressure) in the dust collection chamber.
And the input to the electric blower is continuously controlled.

According to a fourth aspect of the present invention, a positive temperature coefficient thermistor is used as the temperature detecting element so that the resistance value of the resistance circuit increases as the temperature of the vacuum cleaner body increases. Since the resistance of the positive temperature coefficient thermistor is quite large, it can be used as a parallel element in a resistance circuit.

The present invention according to claims 5 to 7 is as described. In the present invention according to claim 8, the rectified voltage is divided by an inductance and a resistance into a reference voltage, and when the frequency of the AC power supply changes, the change in the level of the reference voltage is relatively relative to the change in the charging voltage of the capacitor. Set to be the same. This prevents the timing at which the two waveforms intersect from changing with the frequency of the AC power supply.

[0031]

Embodiments will be described below.

(Embodiment 1) Hereinafter, Embodiment 1 of a vacuum cleaner according to the present invention will be described with reference to the drawings.

FIG. 1 is a circuit diagram showing the configuration of this embodiment. The mechanical configuration of the vacuum cleaner is the same as that in FIG. In the figure, an electric blower 2 is connected to an AC power supply 17.
A rectifier circuit 19 comprising a diode bridge is connected, and a Zener diode 21 is connected to an output of the rectifier circuit 19 via a resistor 20. A charging circuit 26 including a resistor 22, a variable resistor 23, a resistor circuit 24, and a capacitor 25 is connected to both ends of the Zener diode 21, and a connection point between the resistor circuit 24 and the capacitor 25 is connected to an emitter of a transistor 27. A series circuit of a resistor 28 and a resistor 29 is connected to both ends of the Zener diode 21, and a common connection point is connected to a base of the transistor 27 via a diode 30. The variable resistor 23 includes a slide volume 31, a semi-fixed resistor 32,
And a resistor 33, which is built into the hand operation unit 5.

Further, a series circuit of a primary side of a phototriac coupler 34, a resistor 35 and a transistor 36 is connected to both ends of the Zener diode 21.
A secondary circuit of the phototriac coupler 34 is connected to a series circuit of a resistor 37 and a resistor 38. The collector of transistor 27 is connected to the base of transistor 36 via a resistor. A common connection point between the secondary side of the phototriac coupler 34 and the resistor 38 is a bidirectional thyristor 18.
Connected to the gate. The resistance circuit 24 in the charging circuit 26 includes a series connection of a semi-fixed resistor 39 and a resistor 40,
1 are connected in parallel, and a pressure switch 42 is connected to the resistor 40 in parallel. The pressure switch 42 is off when the amount of dust in the dust collection chamber 8 is small.

The operation of the above configuration will be described.
A charging voltage having a waveform obtained by integrating a waveform obtained by performing full-wave rectification of the AC power supply 17 by the rectifier circuit 19 is generated in the capacitor 25 of the charging circuit 26, while the full-wave rectification is provided at a common connection point between the resistors 28 and 29. A divided voltage having the generated waveform is generated as a reference voltage. The charge voltage waveform of the capacitor 25 is applied to the emitter of the transistor 27, and the reference voltage is applied to the base of the transistor 27. Since this reference voltage is a voltage obtained by dividing the full-wave rectified voltage, the waveform and the charging voltage waveform can be set so that the levels intersect. When the reference voltage is reached, the transistor 27 is turned on, and a trigger is output to the gate of the bidirectional thyristor 18 via the transistor 36 and the phototriac coupler 34. At this time, since the level of the charging voltage waveform of the capacitor 25 is determined by the charging time constant of the charging circuit 26, the trigger timing is determined by the charging time constant. Although the description has been made ignoring the potential difference of the diode 30 and the base-emitter voltage of the transistor 27, it goes without saying that it is actually taken into consideration. This is the same in the description of the second to eighth embodiments.

When there is little dust in the dust collection chamber 8, the pressure switch 42 is off, and the resistance 22, the variable resistance 23,
The bidirectional thyristor 18 is fired at a timing determined by a charging time constant by the resistance circuit 24 and the capacitor 25, and the electric blower 2 is controlled at a predetermined phase. When dust accumulates in the dust collection chamber 8, the pressure (negative pressure) in the dust collection chamber 8 increases, and the pressure switch 42 is turned on to short-circuit the resistor 40 in the resistance circuit 24. Since the resistance value decreases and the charging time constant decreases, and the level of the charging voltage waveform of the capacitor 25 increases, the timing of the trigger applied to the bidirectional thyristor 18 is advanced.
That is, the control phase of the electric blower 2 is advanced, the input is increased, and the suction force is increased.

FIG. 2 is a characteristic diagram showing the operation of the present embodiment. FIG. 2A shows the relationship between the input W of the electric blower 2 and the air volume Q. The curve A shows the input W when the pressure switch 42 is off.
The curve B shows the relationship when the pressure switch 42 is on. As can be seen from the figure, the curve B indicates that a larger input is given to the electric blower 2 than the curve A in order to obtain the same air volume. FIG. 2B shows the relationship between the pressure P (negative pressure) in the dust collection chamber 8 and the air volume Q. The curve C shows the pressure P and the air volume Q in the dust collection chamber 8 when the pressure switch 42 is off. The curve d shows the relationship when the pressure switch 42 is on. As can be seen from the figure, when the air volume is the same, the curve C indicates that the pressure is lower than that of the curve D.

When the amount of dust in the dust collection chamber 8 is small, FIG.
Although the operation is performed within the range indicated by the solid line of the curve A in FIG. 2A and the range indicated by the curve C in FIG. 2B, dust (dust) accumulates in the dust collection chamber 8 and the pressure (negative pressure) increases. When the pressure reaches the indicated pressure, the pressure switch 42 is turned on, and the input to the electric blower 2 is switched so as to increase. Therefore, the range of the solid line of the curve B in FIG. Operates on a range. As can be seen from the figure, the operating characteristics are switched according to the predetermined pressure, so that the hysteresis operation is performed as shown in the figure.

As described above, according to the present embodiment, the pressure switch 42 detects the pressure in the dust collecting chamber 8 by the pressure switch 42, and the charging time constant of the charging circuit 26 is switched by the pressure switch 42 to thereby control the electric blower. The input to the electric blower 2 is switched by switching the input to the electric blower 2 when the dust (dust) accumulates in the dust collection chamber 8 and the pressure (negative pressure) increases to a predetermined value, thereby shortening the charging time constant. It can be controlled to increase and increase the suction force so that the suction force can be maintained.

(Embodiment 2) Hereinafter, a vacuum cleaner according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a circuit diagram showing the configuration of the present embodiment. The same components as those in FIG. 1 are denoted by the same reference numerals, and detailed description is omitted. This embodiment is different from the first embodiment in that two pressure switches having different sensitive pressures are provided in the resistance circuit 24 and the dust collection chamber 8 is provided.
The charging time constant of the charging circuit 26 is set to 3
It is to switch to the stage.

In FIG. 3, the resistor circuit 24 in the charging circuit 26 is configured by connecting a resistor 41 in parallel to a series circuit of a semi-fixed resistor 39, a resistor 40, and a resistor 43.
The pressure switch 42 is connected in parallel with the resistor 43, and the pressure switch 44 is connected in parallel with the resistor 43. The pressure switch 42 and the pressure switch 44 are both off when there is no dust in the dust collection chamber 8, but the pressures at which they are turned on are different from each other.

The operation of the above configuration will be described.
When there is little dust in the dust collecting chamber 8, the pressure switches 42 and 44 are off, and the resistor 22, the variable resistor 23, the resistor circuit 24 including the resistors 40 and 43, the semi-fixed resistor 39 and the resistor 41, The bidirectional thyristor 18 is fired at a timing determined by the charging time constant of the capacitor 25 and the electric blower 2 is energized at a phase given by the timing. When dust accumulates in the dust collection chamber 8, the pressure (negative pressure) in the dust collection chamber 8 increases, first, the pressure switch 42 is turned on, the resistor 40 is short-circuited, and the resistance value of the resistance circuit 24 decreases. , The charging time constant becomes shorter, and the firing timing of the bidirectional thyristor 18 becomes earlier. When the pressure (negative pressure) in the dust collection chamber 8 further increases, the pressure switch 44 is also turned on, the resistance 43 is short-circuited, the resistance value of the resistance circuit 24 is further reduced, the charging time constant is further reduced, and the bidirectional operation is performed. The firing timing of the sex thyristor 18 is further advanced. That is, the control phase of the electric blower 2 is further advanced, the input is increased, and the suction force is further increased. As described above, the input to the electric blower 2 is switched in three stages according to the pressure (negative pressure) in the dust collection chamber 8.

FIG. 4 is a characteristic diagram showing the operation of this embodiment. FIG. 4A shows the relationship between the input W of the electric blower 2 and the air volume Q, and FIG. 4B shows the relationship between the pressure P (negative pressure) in the dust collection chamber 8 and the air volume Q. The operation is the same as that of the first embodiment, and a description thereof will be omitted. However, the hysteresis is smaller than that of the first embodiment, and a more precise control is shown.

As described above, according to this embodiment, the pressure in the dust collecting chamber 8 is detected in two stages by the pressure switch 42 and the pressure switch 44 having different sensitive pressures, and the charging circuit 2
The charging time constant of the pressure switch 42 and the pressure switch 44
In this way, when dust accumulates in the dust collection chamber 8, the input to the electric blower 2 is increased by switching to three steps so as to shorten the charging time constant, thereby increasing the suction force. As described above, the suction force can be maintained with more precise control.

It goes without saying that the number of pressure switches is not limited to two. (Embodiment 3) Hereinafter, a vacuum cleaner according to a third embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a circuit diagram showing the configuration of this embodiment. The same components as those in FIG. 1 are denoted by the same reference numerals, and detailed description is omitted. This embodiment is different from the first embodiment in that the resistor circuit 24 is connected to the semi-fixed resistor 39.
And a pressure-operated variable resistor 45 in series, so that the charging time constant of the charging circuit 26 is continuously changed according to the pressure change in the dust collection chamber 8.

In FIG. 5, the resistance circuit 24 is constituted by a series circuit of a semi-fixed resistor 39 and a pressure-operated variable resistor 45. The resistance value of the pressure-operated variable resistor 45 changes continuously according to the pressure. Here, it is assumed that the resistance value decreases as the pressure (negative pressure) increases.

The operation of the above configuration will be described.
When dust accumulates in the dust collection chamber 8, the pressure (negative pressure) in the dust collection chamber 8 increases, the resistance value of the pressure-operated variable resistor 45 decreases, the resistance value of the resistance circuit 24 decreases, and the battery is charged. The charging time constant of the circuit 26 is also shortened and the bidirectional thyristor 18
The ignition timing of is faster. When the pressure (negative pressure) in the dust collection chamber 8 further increases, the resistance value of the pressure-operable variable resistor 45 further decreases, the resistance value of the resistance circuit 24 further decreases, and the charging time constant further shortens. The firing timing of the directional thyristor 18 is further advanced. That is, the control phase of the electric blower 2 is further advanced, the input is increased, and the suction force is increased. The above operation is performed continuously.

FIG. 6 is a characteristic diagram showing the operation of this embodiment. The contents of the characteristic diagram are the same as those of the first and second embodiments, and detailed description is omitted. However, in this embodiment, since the change of the input to the electric blower 2 is performed in a stepless manner, hysteresis occurs. Input can be changed smoothly.

As described above, according to the present embodiment, the point of the bidirectional thyristor 18 for continuously detecting the pressure in the dust collection chamber 8 by the pressure-operated variable resistor 45 and controlling the energization of the electric blower 2 is described. The charging time constant of the charging circuit 26 for determining the arc timing is configured to be continuously changed by the pressure-operated variable resistor 45, and is continuously reduced to reduce the charging time constant when dust accumulates in the dust collection chamber 8. , The input of the electric blower 2 is increased, and the suction force is controlled to be continuously increased so that the suction force can be maintained with a smooth operation.

(Embodiment 4) Hereinafter, a vacuum cleaner according to Embodiment 4 of the present invention will be described with reference to the drawings. FIG. 7 is a circuit diagram showing the configuration of this embodiment. The same components as those in FIG. 1 are denoted by the same reference numerals, and detailed description is omitted. This embodiment is different from the first embodiment in that the resistor 41 in the first embodiment is replaced by the temperature detecting element 46 in the resistance circuit 24.
, The charging time constant of the charging circuit 26 is
It is to change according to the temperature inside. In this embodiment, a temperature detecting element 46 such as a positive temperature coefficient thermistor whose resistance value increases as the temperature increases is used.

The operation of the above configuration will be described.
As in the first embodiment, when dust accumulates in the dust collection chamber 8, the pressure (negative pressure) in the dust collection chamber 8 increases, the pressure switch 42 is turned on, the resistor 40 is short-circuited, and the resistance circuit 24 The resistance value becomes smaller, the charging time constant becomes shorter, and the ignition timing of the bidirectional thyristor 18 becomes earlier. That is, the control phase of the electric blower 2 is advanced, the input is increased, and the suction force is increased.

Here, when the operation of the electric blower 2 is prolonged and the temperature inside the vacuum cleaner main body 1 rises, the temperature detecting element 4
6 increases, the resistance of the resistance circuit 24 increases, the charging time constant increases, and the bidirectional thyristor 1
8, the ignition timing is delayed. That is, the control phase of the electric blower 2 is delayed, the input is reduced, and the load on the electric blower 2 is reduced.

As described above, according to the present embodiment, the pressure switch 42 detects the pressure in the dust collection chamber 8 and
The temperature of the vacuum cleaner main body 1 is detected by the temperature detecting element 46, and the charging time constant of the charging circuit 26 that determines the firing timing of the bidirectional thyristor 18 that controls the energization of the electric blower 2 is switched by the pressure switch 42. It is configured to change according to the temperature inside the vacuum cleaner main body 1, and when dust accumulates in the dust collection chamber 8, the charging time constant is switched so as to be shortened to increase the input of the electric blower 2 and increase the suction power. Control so as to maintain the suction force, and the operation of the electric blower
When the temperature inside increases, the charging time constant is lengthened by the temperature detecting element 46 to reduce the input to the electric blower 2, thereby reducing the load and improving the durability.

(Embodiment 5) Hereinafter, a vacuum cleaner according to a fifth embodiment of the present invention will be described with reference to the drawings. In addition,
The configuration and operation of this embodiment are the same as those of the first embodiment. In this embodiment, the pressure switch 42 is set so as to switch the charging time constant of the charging circuit 26 at a preferable operating point.

FIG. 8 is a characteristic diagram showing the operation of this embodiment. In FIG. 8B, a curve E indicates a suction power determined by the pressure P and the air volume Q, and the maximum point is the maximum suction power. Needless to say, it is preferable that the operating range of the electric blower 2 operates near the maximum suction power.
Now, the pressure switch 42 is set to the air volume Q0 at the maximum suction power.
When the air blower is set to open and close at the pressure P1 at the time of the higher air volume Q1, the operation range when the input to the electric blower 2 is largely switched becomes a range including the maximum suction power, and the maximum suction performance can be exhibited. . If the sensitive pressure of the pressure switch 42 is opened and closed at the pressure P2 when the air flow Q2 is smaller than the air flow Q0 at the point of the maximum suction power, the suction performance is not sufficiently exhibited.

As described above, according to the present embodiment, by setting the opening / closing pressure of the pressure switch 42 to a pressure corresponding to a flow rate higher than the flow rate at the maximum suction power, dust is collected and the dust collection chamber 8 is opened. Can be switched so as to exhibit the maximum suction performance when the pressure (negative pressure) increases.

(Embodiment 6) Hereinafter, a vacuum cleaner according to a sixth embodiment of the present invention will be described with reference to the drawings. In addition,
The configuration and operation of this embodiment are the same as those of the first embodiment. In the present embodiment, the charging time constant of the charging circuit 26 is adjusted according to the individual variation of the electric blower 2.

FIG. 9 is a characteristic diagram showing the operation of the present embodiment, and shows the relationship between the input W of the electric blower 2 and the air volume Q. As shown by the dashed line in the figure, the characteristics of the air volume Q with respect to the input W of the electric blower 2 vary individually. There are a high input and a low input required to obtain the same air volume. Therefore, the semi-fixed resistor 39 in the resistor circuit 24 is adjusted in a state where the resistance value of the variable resistor 23 provided in the hand operation unit 5 is set to zero, and as shown by a solid line, the electric power is supplied to each electric vacuum cleaner main body 1. The relationship between the input W of the blower 2 and the air volume Q is set to be a predetermined input.

FIG. 10 is a waveform diagram showing the state of the adjustment by the voltage applied to the electric blower 2. FIG. 10A shows an applied voltage waveform of the electric blower 2 when the pressure switch 42 is off, and FIG. 10B shows an applied voltage waveform of the electric blower 2 when the pressure switch 42 is on. In the drawing, those having a high input, that is, those requiring a high input,
The resistance value of the semi-fixed resistor 39 is set large to delay the control phase when the input value is low, that is, when the input value is low.

When the amount of dust in the dust collecting chamber 8 is small, FIG.
As shown in (a), the operation is performed without any individual difference in a state where the semi-fixed resistor 39 is adjusted. When dust accumulates in the dust collection chamber 8, the pressure P (negative pressure) in the dust collection chamber 8 increases, and the pressure switch 4
2 is turned on and the resistor 40 is short-circuited. In this case as well, the setting of the semi-fixed resistor 39 corresponds to the individual difference.
It acts to absorb individual differences as shown in FIG.

As described above, according to this embodiment, the semi-fixed resistor 39 in the resistance circuit 24 is adjusted for each vacuum cleaner main body 1 so that the characteristics of the input W and the air volume Q of the electric blower 2 are the same. By setting to, variations in the characteristics of the electric blower 2 are absorbed, and it is possible to provide a vacuum cleaner in which the suction power of each vacuum cleaner main body 1 has a small variation.

Embodiment 7 Hereinafter, a seventh embodiment of the vacuum cleaner of the present invention will be described with reference to the drawings. FIG.
FIG. 2 is a circuit diagram showing a configuration of the present embodiment. Example 1
The same components as those described above are denoted by the same reference numerals, and detailed description is omitted. This embodiment is different from the first embodiment in that a zener diode 47 is connected in parallel with a resistor 29 for setting a reference voltage.
Are connected to each other to cope with a frequency change of the AC power supply 17.

The operation of the above configuration will be described.
FIG. 12 is a waveform chart showing the operation of this embodiment. FIG.
11A shows the voltage waveform at point A in FIG. 11, that is, the waveform of the voltage across the Zener diode 21 in comparison with the frequency of the AC power supply 17 of 60 Hz and 50 Hz. It is. The waveform p shown by the dashed line in FIG.
, The charging voltage waveform of the capacitor 25, the waveform q shown by the solid line is the voltage at the point B in FIG.
That is, it shows a reference voltage waveform. In this embodiment, as shown by the waveform q, the reference voltage waveform at the point B is clipped by the zener by the zener diode 47.

In FIG. 12B, when the charging of the charging circuit 26 progresses and the voltage at the point C becomes higher than the voltage at the point B and becomes higher than the clipped voltage, the transistor 27 is turned on. Since the bidirectional thyristor 18 is turned on, the voltage in the hatched portion of the waveform shown in FIG. 12C is applied to the electric blower 2. The ON timing is set so as to be in the waveform region clipped by the Zener diode 47.

In the trigger circuits described in the first to sixth embodiments, the level of the charging voltage waveform of the capacitor 25 decreases as the frequency of the AC power supply 17 increases, while the level of the resistance-divided reference voltage waveform changes. Does not change with frequency. Therefore, with the circuit of the first embodiment shown in FIG.
In the case of changing to z, the level of the waveform of the charging voltage of the capacitor 25 becomes relatively smaller than the level of the waveform of the reference voltage, the phase of the trigger is delayed, and the input to the electric blower 2 is reduced. Conversely, as the frequency decreases, the input to the electric blower 2 increases. On the other hand, in this embodiment, the reference voltage is clipped by the Zener diode 47, and the voltage is compared in the clipped range, so that the change in the relative level is reduced, and the input change to the electric blower 2 is reduced. Has improved.

As described above, according to the present embodiment, the zener diode 47 is inserted into the base of the transistor 27 and the waveform of the reference voltage is clipped to a predetermined value, so that the phase for triggering the bidirectional thyristor 18 is AC. Power supply 17
Can be improved so that it does not greatly change with respect to the frequency change of
Even if z, the input of the electric blower 2 can be made substantially the same, and it is possible to provide a vacuum cleaner whose suction force is stable with respect to frequency.

Embodiment 8 Hereinafter, an eighth embodiment of the vacuum cleaner of the present invention will be described with reference to the drawings. FIG.
FIG. 2 is a circuit diagram showing a configuration of the present embodiment. Example 1
The same components as those described above are denoted by the same reference numerals, and detailed description is omitted. This embodiment differs from the first embodiment in that an inductance 48 is provided instead of the resistor 28 in the first embodiment. As shown in the figure, a voltage obtained by dividing the rectified waveform of the AC power supply 17 by the inductance 48 and the resistor 29 is set as a reference voltage applied to the base of the transistor 27.

The operation of the above configuration will be described.
FIG. 14 is a waveform chart showing the operation of this embodiment. FIG.
13A shows the voltage waveform at the point A in FIG. 13, that is, the waveform of the voltage between both ends of the Zener diode 21, which is a waveform that has been full-wave rectified by the rectifier circuit 19. Further, a waveform p shown in FIG. 14 (b) indicates a voltage at point C in FIG. 13, that is, a charging voltage waveform of the capacitor 25, and a waveform q indicates a voltage at point B in FIG. When the charging of the charging circuit 26 progresses and the voltage at the point C exceeds the voltage at the point B, the transistor 27 is turned on, and at that time, the bidirectional thyristor 18 is turned on, as shown in FIG. The shaded portion of the waveform is applied to the electric blower 2.

As described in the seventh embodiment, the voltage at the point C
That is, the level of the charging voltage waveform of the capacitor 25 changes according to the frequency of the AC power supply 17. On the other hand, when a reference voltage obtained by simply dividing the full-wave rectified voltage by resistance is applied to the point B, the level of the reference voltage waveform does not change with the frequency. , The trigger timing changes depending on the frequency of the AC power supply 17. In this embodiment, the full-wave rectified voltage is divided by the inductance 48 and the resistor 29 and given as a reference voltage, so that the level of the reference voltage is also set to change with respect to the frequency. It can be set so that the relative level between the level and the level of the waveform of the reference voltage does not change with respect to the frequency. Therefore, even if the frequency of the AC power supply 17 changes, the trigger timing does not change, and the input to the electric blower 2 can be set so as not to change with the frequency of the AC power supply 17.

As described above, according to the present embodiment, the full-wave rectified voltage is divided by the inductance 48 and the resistor 29 and used as the reference voltage, so that even if the frequency of the AC power supply 17 changes, the electric blower 2 The input can be kept unchanged, and a vacuum cleaner with a stable suction force with respect to frequency can be provided.

[0071]

According to the first aspect of the present invention, there is provided an AC power supply via a resistance circuit in which a resistance value is switched by a pressure switch which opens and closes at a predetermined negative pressure in a dust collection chamber and a variable resistor provided in a hand operation unit. The charging voltage of the capacitor of the charging circuit that charges the capacitor with the rectified voltage is compared with a reference voltage based on the rectified voltage, the timing of the phase control is determined, the input to the electric blower is phase-controlled, and the dust collection is performed. By using a vacuum cleaner that controls the input to the electric blower by switching the resistance value of the resistance circuit by the pressure switch in accordance with the negative pressure in the room, the circuit can be simplified and reduced in size. The suction force can be maintained in response to an increase in dust.

According to a second aspect of the present invention, there is provided an electric cleaning apparatus in which a plurality of pressure switches having different sensitive pressures are provided, and the resistance value of the resistance circuit is changed stepwise in accordance with the negative pressure in the dust collection chamber. By using a fan, the electric blower can be controlled more precisely.

According to a third aspect of the present invention, a resistance circuit in which a resistance value can be continuously changed by a pressure-actuated variable resistor responsive to a negative pressure in a dust collection chamber and a variable resistor provided in a hand operation unit are provided. The charging voltage of the capacitor of the charging circuit that charges the capacitor with the rectified voltage of the AC power supply, the phase control of the input to the electric blower by determining the timing of the phase control by comparing with the reference voltage based on the rectified voltage, By making the vacuum cleaner so as to control the input to the electric blower by continuously changing the resistance value of the resistance circuit by the pressure-operating type variable resistor corresponding to the negative pressure in the dust collection chamber, With a circuit that is reduced in size with a simple configuration, the suction force can be maintained continuously in response to an increase in dust.

According to a fourth aspect of the present invention, a temperature detecting element whose resistance changes with the temperature inside the vacuum cleaner main body is provided in the resistance circuit, and the input of the electric blower is controlled according to the temperature of the vacuum cleaner main body. By using the vacuum cleaner according to any one of claims 1 and 2, when the temperature inside the vacuum cleaner body rises due to long-time use, the input to the electric blower is reduced and burdened. And the temperature rise can be suppressed.

According to a fifth aspect of the present invention, there is provided the electric vacuum cleaner according to any one of the first and second aspects, wherein the pressure switch is opened and closed at a negative pressure when the air volume is higher than the maximum suction power. By doing so, it is possible to operate at the maximum suction power when the input to the electric blower is increased by the pressure switch.

According to a sixth aspect of the present invention, the resistance circuit includes a semi-fixed resistor, and the input to the electric blower when the resistance value of the variable resistor of the hand operation unit is set to zero is set to a predetermined value by the semi-fixed resistor. By setting the vacuum cleaner according to any one of claims 1 to 5 to be set, it is possible to absorb variations in characteristics of the electric blower and set the suction power of each vacuum cleaner so as not to vary. Can be.

According to a seventh aspect of the present invention, there is provided a vacuum cleaner according to the first to sixth aspects, wherein a voltage obtained by clipping a resistance divided voltage of a rectified voltage of an AC power supply with a zener diode is used as a reference voltage. Even if the frequency of the AC power supply used changes, the input to the electric blower can be improved so as not to change significantly.

The present invention according to claim 8 is used by making the electric vacuum cleaner according to any of claims 1 to 6 a voltage obtained by dividing a rectified voltage of an AC power supply by an inductance and a resistance as a reference voltage. It can be set so that the input to the electric blower does not change even if the frequency of the AC power supply changes.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a configuration of a first embodiment of a vacuum cleaner according to the present invention.

FIG. 2 is a characteristic diagram showing an operation of the embodiment.

FIG. 3 is a circuit diagram showing a configuration of a second embodiment of the vacuum cleaner according to the present invention.

FIG. 4 is a characteristic diagram showing the operation of the embodiment.

FIG. 5 is a circuit diagram showing a configuration of a third embodiment of the vacuum cleaner according to the present invention.

FIG. 6 is a characteristic diagram showing an operation of the embodiment.

FIG. 7 is a circuit diagram showing a configuration of a vacuum cleaner according to a fourth embodiment of the present invention.

FIG. 8 is a characteristic diagram showing the operation of the vacuum cleaner according to the fifth embodiment of the present invention.

FIG. 9 is a characteristic diagram showing an operation of the vacuum cleaner according to the sixth embodiment of the present invention.

FIG. 10 is a waveform chart showing the operation of the embodiment.

FIG. 11 is a circuit diagram showing a configuration of a seventh embodiment of the vacuum cleaner of the present invention.

FIG. 12 is a waveform chart showing the operation of the embodiment.

FIG. 13 is a circuit diagram showing a configuration of a vacuum cleaner according to an eighth embodiment of the present invention.

FIG. 14 is a waveform chart showing the operation of the embodiment.

FIG. 15 is a partial cross-sectional external view illustrating a configuration of a vacuum cleaner.

FIG. 16 is a circuit diagram showing a configuration of a conventional vacuum cleaner.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Vacuum cleaner main body 2 Electric blower 3 Suction port 4 Hose 5 Hand operation part 6 Extension tube 7 Suction tool 8 Dust collection room 17 AC power supply 18 Bidirectional thyristor 19 Rectifier circuit 20,22,28,29,33,35, 37,38,4
0, 41, 43 Resistance 21, 47 Zener diode 23 Variable resistance 24 Resistance circuit 25 Capacitor 26 Charging circuit 27, 36 Transistor 30 Diode 31 Slide volume 32, 39 Semi-fixed resistance 34 Phototriac coupler 42, 44 Pressure switch 45 Pressure operation type Variable resistance 46 Temperature detection element 48 Inductance

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Oshima ▲ Yasu ▼ Ouo 1006 Kadoma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd.

Claims (8)

[Claims] An electric blower for sucking dust, a dust collecting chamber for collecting the sucked dust, a main body of a vacuum cleaner including a control circuit for controlling the electric blower, and a user using an output of the electric blower. A hose having a hand-operated portion incorporating a variable resistor to be adjusted, wherein the control circuit is a bidirectional thyristor for supplying power to the electric blower from an AC power supply by phase control, and a predetermined negative pressure in the dust collection chamber. A charging circuit that charges a capacitor with a rectified voltage of the AC power supply through a resistor circuit whose resistance value is switched by a pressure switch that opens and closes with the variable resistor; and a reference voltage based on the rectified voltage, the charging voltage of the capacitor. A trigger circuit for controlling the bidirectional thyristor at a timing determined by comparison, wherein the pressure switch responds to a negative pressure in the dust collection chamber by the pressure switch. An electric vacuum cleaner wherein an input to the electric blower is controlled by switching a resistance value of a resistance circuit. 2. The vacuum cleaner according to claim 1, further comprising a plurality of pressure switches having different sensitive pressures, wherein the resistance value of the resistance circuit is switched stepwise according to the negative pressure in the dust collecting chamber. 3. A vacuum cleaner main body having a built-in electric blower for sucking dust, a dust collection chamber for collecting the sucked dust, a control circuit for controlling the electric blower, and a user using an output of the electric blower. A hose having a hand-operated operation section with a built-in variable resistor for adjusting, wherein the control circuit is a bidirectional thyristor for supplying electric power to the electric blower from the AC power supply by phase control, and a negative pressure in the dust collection chamber. A charging circuit for charging a capacitor with a rectified voltage of the AC power supply through a resistor circuit whose resistance value can be continuously changed by a responsive pressure-operated variable resistor and the variable resistor; A trigger circuit for controlling the bidirectional thyristor at a timing determined by comparison with a reference voltage based on the pressure-operated type variable resistor corresponding to a negative pressure in the dust collection chamber. A vacuum cleaner wherein the input to the electric blower is controlled by changing the resistance value of the resistance circuit. 4. A resistance circuit having a temperature detecting element whose resistance value changes with the temperature inside the vacuum cleaner main body, wherein an input to the electric blower is controlled according to the temperature inside the vacuum cleaner main body. The vacuum cleaner according to any one of claims 1 to 2. 5. The vacuum cleaner according to claim 1, wherein the pressure switch opens and closes at a negative pressure when the air flow is higher than the air flow at the maximum suction power. 6. The resistance circuit has a semi-fixed resistor, and sets the resistance value of the semi-fixed resistor so that the input to the electric blower when the resistance value of the variable resistor in the hand operation unit is set to zero becomes a predetermined value. The vacuum cleaner according to any one of claims 1 to 5, wherein the vacuum cleaner is used. 7. The vacuum cleaner according to claim 1, wherein a voltage obtained by clipping a resistance-divided voltage of the rectified voltage with a Zener diode is used as a reference voltage. 8. The vacuum cleaner according to claim 1, wherein a voltage obtained by dividing the rectified voltage by an inductance and a resistance is used as a reference voltage.