JPH11128134A - Electric vacuum cleaner - Google Patents

Abstract

(57) [Problem] To provide an electric vacuum cleaner for controlling electric power of an electric blower by electric current of the electric blower, and the electric blower abnormally heats even if the power supply voltage of the electric blower fluctuates and the power supply voltage increases. To prevent An electric blower for suction, a current detecting means for detecting a current flowing through the electric blower, and a phase control means for controlling electric power of the electric blower according to an output of the current detecting means. And a voltage detecting means 13 for detecting fluctuations in the power supply voltage, comparing the output of the current detecting means 5 with a reference level, and controlling the power of the electric blower 2 to the phase controlling means 11.
When the increase in the power supply voltage is detected by the output of the voltage detection means 13, the reference level is changed, the control amount by the phase control means 11 is reduced, and the power consumption of the electric blower is reduced to the normal power supply voltage. By maintaining the same, the temperature rise of the electric blower 2 is suppressed regardless of the fluctuation of the power supply voltage.

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 of an electric blower.

[0002]

2. Description of the Related Art A conventional vacuum cleaner will be described with reference to FIGS. First, the overall configuration of the vacuum cleaner will be described with reference to FIG. That is, in the main body 1 of the electric vacuum cleaner, an electric blower 2 for generating a suction force and a dust collecting chamber 9 for collecting dust sucked by the electric blower 2 are provided. A suction port 3 facing the dust collection chamber 9 is provided in front of the main body 1, and one end of a hose 4 is connected to the suction port 3.
At the other end of the hose 4, a hand operation unit 6 is provided. One end of the extension tube 7 is connected to the hand operation unit 6, and a suction tool 8 is connected to the other end of the extension tube 7. And electric blower 2
When the is operated, dust on the floor surface is sucked from the suction tool 8, and the sucked dust is collected in the dust collection chamber 9 via the extension pipe 7 and the hose 4. In order to control the driving of the electric blower 2, there is a circuit configuration shown in FIG. That is, the electric blower 2 is connected to the AC power supply 12 via the bidirectional thyristor 12, and the electric power of the electric blower 2 is controlled by performing the phase control by the bidirectional thyristor 12.

Further, in recent vacuum cleaners, suction performance is improved. “Suction power”, which is one of the suction performances of the vacuum cleaner, will be described. FIG. 13 operates the electric blower 2 by controlling the phase with a certain fixed phase,
FIG. 4 is a diagram showing the relationship among the air volume, power consumption, degree of vacuum, and suction power when the air volume is changed. The degree of vacuum and the air volume are such that the air volume increases and the vacuum level decreases.
In addition, since the suction power is calculated by a constant × air volume × vacuum degree, the suction power becomes a peak at the time of the air volume from the relationship between the air volume and the vacuum degree, and the air volume increases and decreases at the peak. Then, the suction power decreases as if drawing a parabola. Furthermore, in an actual vacuum cleaner, the suction power is designed to be performed at an air flow near the peak.

In addition, Japan (Japan) has restrictions such as the JIS standard and the Electrical Appliance and Material Control Law, and the rated power consumption of a household vacuum cleaner must be 1 kW or less. Therefore, the maximum power consumption is 1 kW. It is necessary to keep it below. In addition, when the suction power is larger than the airflow at which the suction power is peaked, the power consumption increases as shown in FIG. 13, so that the power consumption is set to the rated power consumption at the point where the suction power becomes the peak. Then, the power consumption exceeds the rated power consumption when the suction power exceeds the peak airflow, while the power consumption exceeds the rated power consumption when the suction power decreases below the peak airflow. Will drop.

Therefore, in recent years, the suction power has peaked,
That is, electric power control is performed so that the power consumption is maximized at the maximum air flow, and control of the vacuum cleaner that maximizes the suction power is proposed, and this is becoming mainstream.

The control of the electric blower of this type of vacuum cleaner will be described with reference to FIG. In FIG. 11, reference numeral 5 denotes current detection means for detecting a current supplied to the electric blower 2.
Reference numeral 11 denotes a phase control unit that sets a phase control amount of the electric blower 2 according to a detection result of the current detection unit 5 and a set value of the hand operation unit 6 set by a user, and is configured by a microcomputer. 12 is an electric blower 2 based on the control result.
Is a bidirectional thyristor for driving the electric blower 2,
The current detecting means 5 and the bidirectional thyristor 12 are connected in series between the AC power supplies 10.

The operation of the above configuration will be described with reference to FIG. As shown in FIG.
For 0, Q1, Q2, and Q3, the power consumption is W0, W1,
The phase control amount is set to t0 (full energization) so that W2 and W3 are obtained,
Defined as t1, t2, and t3. In addition, it is set so that the suction power is maximized in the case of the power consumption W0. next,
FIG. 1 shows the output of the current detection means 5 with respect to the air flow.
FIG. 12B shows the output of the current detection means 5 and the amount of phase control.

At the current point A (air volume Q3, phase control amount t3, output V3 of the current detection means 5), if the suction device 8 is closed with paper or the like, and if the air volume is reduced, the power consumption is reduced as shown in FIG.
The output of the current detecting means 5 drops to the point B in FIG.
FIG. 12 (a) is reduced to point B (VB).
(B) is set to tB, and the power consumption increases because t3> tB. When the power consumption increases, the output of the current detection means 5 increases, delaying the phase control amount and reducing the power consumption. Eventually, it is stabilized at the point C (air volume Q2, phase control amount t2, output V2 of the current detection means 5) by the air path load resistance. As described above, when the suction tool 8 is covered with paper or the like or dust accumulates in the dust collection chamber 9, the air volume changes,
The operation indicated by the thick solid line in FIGS. 12A to 12C is performed, and the power consumption can be controlled to the maximum by reducing the air volume.

If the suction device 8 is operated while it is closed, or if the dust collection chamber 9 is operated for a long time while being full of dust, the electric blower 2 is abnormally heated. At this time, the output becomes V00 of the current detecting means 5, and when the phase control amount is set to t1 at that time, the power consumption becomes W
Since the temperature dropped from 3 to W4 at a stretch, the abnormal heating could be prevented.

[0010]

However, in such a conventional vacuum cleaner, when the power supply voltage of the AC power supply 10 fluctuates and increases, the output of the current detecting means 5 increases and the phase control amount is reduced to t1. Since the air volume point (the air volume point at which the output of the current detection means 5 reaches V00) is lower than Q00, there is a problem that the electric blower 2 is abnormally heated.

An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide a vacuum cleaner that prevents abnormal heating of an electric blower regardless of fluctuations in a power supply voltage.

[0012]

In order to achieve the above object, the present invention provides voltage detecting means for detecting a power supply voltage,
The reference level is changed according to the detected power supply voltage, and the phase control amount of the phase control means for controlling the power of the electric blower is reduced according to the reference level. This is to prevent abnormal heating.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION
An electric blower for suction, current detection means for detecting a current flowing through the electric blower, phase control means for controlling electric power of the electric blower in accordance with an output of the current detection means, and detecting a change in power supply voltage A voltage detection unit that compares the output of the current detection unit with a reference level, changes the power of the electric blower by the phase control unit, and changes the reference level according to the output of the voltage detection unit. In addition, even when the power supply voltage fluctuates, abnormal heating of the electric blower is prevented.

According to a second aspect of the present invention, there is provided an electric blower for suction, current detecting means for detecting a current flowing through the electric blower, and electric power of the electric blower in accordance with an output of the current detecting means. A voltage control means for detecting a change in power supply voltage, and a display means for comparing and displaying the output of the current detection means with a reference level, and providing a reference in accordance with the output of the voltage detection means. With this configuration, the output of the current detecting means can be accurately displayed even if the power supply voltage fluctuates.

According to a third aspect of the present invention, there is provided an electric blower for suction, current detecting means for detecting a current flowing through the electric blower, and electric power of the electric blower in accordance with an output of the current detecting means. Phase control means for controlling the power supply voltage, and voltage detection means for detecting a change in the power supply voltage, when the power supply voltage is not fluctuated and the phase control is not performed, the power supply voltage fluctuation is detected by the voltage fluctuation means. Then, the phase control is performed by the phase control means. According to this configuration, the maximum power point is prevented from fluctuating even when the power supply voltage fluctuates, and abnormal heating of the electric blower is prevented.

According to a fourth aspect of the present invention, there is provided an electric blower for suction, a rotational speed detecting means for detecting a rotational speed of the electric blower, and the electric blower according to an output of the rotational speed detecting means. Phase control means for controlling the power of the power supply, and voltage detection means for detecting fluctuations in the power supply voltage, comparing the output of the rotation speed detection means with a reference level, changing the power of the electric blower by the phase control means According to this configuration, abnormal heating of the electric blower is prevented even when the power supply voltage fluctuates.

According to a fifth aspect of the present invention, there is provided a rotational speed detecting means for detecting the rotational speed of the electric blower, and a phase control means for controlling the electric power of the electric blower according to the output of the rotational speed detecting means. A voltage detecting means for detecting a change in the power supply voltage, and a display means for comparing and displaying the output of the rotational speed detecting means with a reference level, wherein the reference level is changed according to the output of the voltage detecting means. According to this configuration, accurate display can be performed even if the power supply voltage fluctuates.

According to a sixth aspect of the present invention, there is provided an electric motor comprising: a phase control means for controlling electric power of an electric blower in accordance with an output of a rotational speed detection means; and a voltage detection means for detecting a fluctuation of a power supply voltage. When the power supply voltage does not fluctuate and the phase control is not performed, when the power supply voltage fluctuation is detected by the voltage fluctuation means, the phase control means performs phase control. Even if it fluctuates, the maximum power point can be prevented from fluctuating, and abnormal heating of the electric blower can be prevented.

[0019]

【Example】

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. The same parts as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 1, reference numeral 13 denotes voltage detecting means for detecting a voltage fluctuation of the AC power supply 10.

The operation of the above configuration is as follows. That is, it is possible to determine whether the power supply voltage is high or normal by detecting the power supply voltage of the AC power supply 10 by the voltage detection means 13 and inputting the signal to the phase control means 11.

In FIG. 2, (A) shows when the power supply voltage is normal, and (A) shows when the power supply voltage is high. FIG.
In FIG. 2A, when the power supply voltage is normal (A), when the output of the current detecting means 6 becomes V00, the phase control amount is set to t1 as shown in FIG. 2B. Next, when the power supply voltage becomes high (a), when the output of the current detection means 6 is V00 and the phase control is performed, the same as when the power supply voltage is normal,
The current detection means changes as indicated by the dotted line in FIG. 2A, and the power consumption decreases at the point where the air volume is Q02.

In this embodiment, when the power supply voltage is high, the reference level at which the phase control amount is set to t1 is changed from that when the power supply voltage is normal. That is, the current detecting means 6
When the output becomes V01, the phase control amount is set to t1, and the power consumption is reduced at the point where the air volume is Q01. As a result, as shown in FIG. 2C, the amount of air for reducing power consumption can be reduced to about the same level as when the power supply voltage is normal, and abnormal heating of the electric blower can be prevented.

(Embodiment 2) Next, a second embodiment of the present invention will be described with reference to FIGS. Components having the same configuration as in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 3, reference numeral 14 denotes a display unit for displaying a replacement time of a garbage bag (not shown) when dust accumulates in the vacuum cleaner and the air volume decreases.

In FIG. 4, (A) shows the case where the power supply voltage is normal, and (A) shows the case where the power supply voltage is high. FIG.
In (a), when the power supply voltage is normal (A), when the output of the current detection means 6 becomes V0, it is determined that dust is full in the dust bag, and the display means 14 is displayed. The air volume at this time is Q0 from FIG.

Next, when the power supply voltage becomes high (A), the output of the current detecting means 6 is the same as V0 when the power supply voltage is normal.
When the display is performed by the display means 14, the air volume is displayed at the point of Q03.
When the display means 14 is displayed when the output of V1 becomes V1, the air volume is displayed at the point of Q0 even when the power supply voltage is high. As a result, accurate display can be performed with the same air volume without depending on the fluctuation of the power supply voltage.

(Embodiment 3) Next, a third embodiment of the present invention will be described with reference to FIG. Components having the same configuration as in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 5, (a) shows when the power supply voltage is normal, and (a) shows when the power supply voltage is high. FIG.
In FIG. 5A, when the power supply voltage is normal (A), the phase control amount is t0 when the output of the current detecting means 6 is V0, that is, the phase control is not performed. c)
Power consumption is maximized.

Here, when the power supply voltage rises (a)
Is that the output of the current detecting means 6 is V5 in FIG. 5 (a) to give a constant amount of phase control t5 (FIG. 5 (b)).
The power consumption can be prevented from exceeding W0 as shown in FIG. Thus, the maximum power consumption can be suppressed even when the power supply voltage increases due to the power supply voltage fluctuation.

(Embodiment 4) Hereinafter, a fourth embodiment of the present invention will be described with reference to FIGS. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 6, reference numeral 15 denotes a rotation speed detecting means for detecting the rotation speed of the electric blower 2 and outputting a voltage in response to a change in the rotation speed.

The operation of the above configuration is as follows. That is, it is possible to determine whether the power supply voltage is high or normal by detecting the power supply voltage of the AC power supply 10 with the voltage detection means 13 and inputting the signal to the phase control means 11.

FIG. 7A is a graph when the power supply voltage is normal, and FIG. 7A is when the power supply voltage is high. 7A, when the power supply voltage is normal (A), when the output of the rotation speed detecting means 15 becomes V00, FIG.
As shown in (b), the phase control amount is set to t1.

Next, when the power supply voltage rises (a),
When phase control is performed with the output of the rotation speed detection means 15 being V00, which is the same as when the power supply voltage is normal, the current detection means changes as indicated by the dotted line in FIG. Will fall.

In this embodiment, when the power supply voltage is high, the reference level at which the phase control amount is set to t1 is changed from that when the power supply voltage is normal. That is, the power consumption decreases at the point where the air volume is at Q02. However, if the phase control amount is set to t1 when the output of the rotation speed detecting means 15 becomes V01, the air volume at the point of Q01 is obtained. Power consumption can be reduced. As a result, the amount of air that reduces power consumption can be reduced to about the same level as when the power supply voltage is normal.

(Embodiment 5) Next, a fifth embodiment of the present invention will be described with reference to FIGS. The same components as those in the fourth embodiment are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 8, reference numeral 14 denotes a display unit for displaying a replacement time of a garbage bag (not shown) when dust accumulates in the vacuum cleaner and the air volume decreases.

In FIG. 9, (A) shows a case where the power supply voltage is normal, and (A) shows a case where the power supply voltage is high. In FIG. 9, when the power supply voltage is normal (A), the rotation speed detecting means 15
It is determined that the dust is full in the garbage bag when the output of becomes V0, and the display means 14 is displayed. The air volume at this time is Q0 from FIG.

Next, when the power supply voltage becomes high (a),
When the output of the rotational speed detecting means 15 is V0 and displayed on the display means 14 as in the case where the power supply voltage is normal, the air volume becomes Q03.
Therefore, if the display means 14 is displayed when the output of the rotation speed detection means 15 becomes V1, the air volume is displayed at the point of Q0 even when the power supply voltage is high. It will be. Thus, the display can be performed with the same air volume without depending on the fluctuation of the power supply voltage.

(Embodiment 6) Next, a sixth embodiment of the present invention will be described with reference to FIG. The circuit configuration is the same as in the fourth embodiment.

In FIG. 10, (A) shows when the power supply voltage is normal, and (A) shows when the power supply voltage is high. FIG.
In FIG. 10A, when the power supply voltage is normal (A), the phase control amount is t0, that is, the phase control is not performed when the output of the rotation speed detecting means 15 is V0.
(C) The power consumption is maximized.

Here, when the power supply voltage rises (a)
The output of the rotation speed detecting means 15 is given by V5 in FIG.
(B)) and the power consumption is W as shown in FIG.
It can be set not to exceed 0. As a result, the maximum power consumption can be suppressed even when the power supply voltage fluctuation is high.

[0044]

According to the first aspect of the present invention,
Since the reference level is changed according to the power supply voltage detected by the voltage detection means, and the phase control amount of the phase control means for controlling the power of the electric blower is reduced according to the reference level, the power supply voltage fluctuates. Even in such a case, abnormal heating of the electric blower can be prevented.

According to the second aspect of the present invention, there is provided display means for comparing and displaying the output of the current detection means with the reference level, and changing the reference level in accordance with the output of the voltage detection means. The output of the current detecting means can be accurately displayed even if the power supply voltage fluctuates, and the replacement time of the dust bag can be appropriately displayed without depending on the fluctuation of the power supply voltage.

According to the third aspect of the present invention, when the power supply voltage does not fluctuate and the phase control is not performed on the electric blower, if the power supply voltage fluctuation is detected by the voltage fluctuation means, the phase control means turns on the power. Since the phase control is performed, the maximum power is prevented from fluctuating and increasing even if the power supply voltage fluctuates, and abnormal heating of the electric blower is prevented.

According to the fourth aspect of the present invention, the phase control is performed by the rotation speed detecting means and the reference level, and the reference level is changed according to the power supply voltage detected by the voltage detecting means. Since the phase control amount of the phase control means for controlling the power of the electric blower according to the reference level is reduced, abnormal heating of the electric blower can be prevented even when the power supply voltage fluctuates.

According to the fifth aspect of the present invention, there is provided display means for comparing and displaying the output of the rotational speed detecting means with the reference level, and changing the reference level in accordance with the output of the voltage detecting means. Even if the voltage fluctuates, the output of the rotation speed detecting means can be accurately displayed, and the timing for replacing the garbage bag can be appropriately displayed without depending on the fluctuation of the power supply voltage.

According to the sixth aspect of the present invention, the phase control is performed by the rotation speed detecting means and the reference level. When the power supply voltage of the electric blower is not changed and the phase control is not performed, When the power supply voltage fluctuation is detected by the voltage fluctuation means, phase control is performed by the phase control means.
Even if the power supply voltage fluctuates, the maximum power is prevented from fluctuating and increasing, and abnormal heating of the electric blower is prevented.

[Brief description of the drawings]

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

FIG. 2 (a) is a characteristic diagram of the output V of the current detecting means of the vacuum cleaner and the air volume Q. (b) is a characteristic diagram of the control phase S of the vacuum cleaner and the output V of the current detecting means. Characteristic diagram of electric power W and air volume Q of the vacuum cleaner

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

FIG. 4 shows an output V and an air flow Q of a current detecting means of the vacuum cleaner.
Characteristic diagram with

FIG. 5 (a) is a characteristic diagram of electric power W and air volume Q of a vacuum cleaner according to a third embodiment of the present invention. (B) Characteristics of output V and air volume Q of current detecting means of the vacuum cleaner. Fig. (C) Characteristic diagram of electric power W and air volume Q of the vacuum cleaner

FIG. 6 is a circuit block diagram of a vacuum cleaner showing a fourth embodiment of the present invention.

FIG. 7 (a) is an output V of a rotation speed detecting means of the electric vacuum cleaner.
(B) Characteristic diagram of control phase S of the vacuum cleaner and output V of rotation speed detecting means (c) Characteristic diagram of electric power W and air volume Q of the vacuum cleaner

FIG. 8 is a circuit block diagram of a vacuum cleaner showing a fifth embodiment of the present invention.

FIG. 9 shows output V and air flow Q of current detection means of the vacuum cleaner.
Characteristic diagram with

FIG. 10 (a) is a characteristic diagram of electric power W and air volume Q of a vacuum cleaner showing a sixth embodiment of the present invention. (B) Characteristics of output V and air volume Q of current detection means of the electric vacuum cleaner. Fig. (C) Characteristic diagram of electric power W and air volume Q of the vacuum cleaner

FIG. 11 is a circuit block diagram of a conventional vacuum cleaner.

FIG. 12 (a) is an output V of current detection means of the vacuum cleaner.
(B) Characteristic diagram of control phase S of the vacuum cleaner and output V of current detection means (c) Characteristic diagram of electric power W and air volume Q of the vacuum cleaner

FIG. 13 is a diagram showing the relationship between the air flow rate, power consumption, suction power, and degree of vacuum of the vacuum cleaner.

FIG. 14 is a side view of a vacuum cleaner.

[Explanation of symbols]

 2 Electric blower 5 Current detecting means 11 Phase control means 13 Voltage detecting means 14 Display means 15 Revolution detecting means

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Hiroyuki Senoo 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (6)

[Claims] 1. An electric blower for suction, a current detecting means for detecting a current flowing through the electric blower, a power control means for controlling electric power of the electric blower according to an output of the current detecting means, and a power supply Voltage detecting means for detecting a change in voltage, comparing the output of the current detecting means with a reference level, changing the power of the electric blower by the power control means, and changing the reference level according to the output of the voltage detecting means. Change the vacuum cleaner. 2. An electric blower for suction, current detection means for detecting a current flowing through the electric blower, power control means for controlling electric power of the electric blower according to an output of the current detection means, and a power supply. A vacuum cleaner, comprising: voltage detection means for detecting a change in voltage; and display means for comparing and displaying the output of the current detection means with a reference level, and changing the reference level according to the output of the voltage detection means. 3. An electric blower for suction, current detecting means for detecting a current flowing through the electric blower, power control means for controlling electric power of the electric blower in accordance with an output of the current detecting means, and a power supply. An electric vacuum cleaner comprising a voltage detecting means for detecting a change in voltage, wherein the electric power is controlled by the power control means when a power supply voltage fluctuation is detected by the voltage detecting means when the electric blower is not controlled in power. 4. An electric blower for suction, rotation speed detecting means for detecting rotation of the electric blower, power control means for controlling electric power of the electric blower in accordance with an output of the rotation speed detecting means, A voltage detection unit that detects a change in a power supply voltage, compares an output of the rotation speed detection unit with a reference level, changes power of the electric blower by the power control unit, and responds to an output of the voltage detection unit. Vacuum cleaner that changes the reference level. 5. An electric blower for suction, rotation speed detecting means for detecting rotation of the electric blower, power control means for controlling electric power of the electric blower in accordance with an output of the rotation speed detecting means, A vacuum cleaner comprising: voltage detection means for detecting a change in power supply voltage; and display means for comparing and displaying the output of the rotation speed detection means with a reference level, wherein the reference level is changed according to the output of the voltage detection means. . 6. An electric blower for suction, a rotation speed detecting means for detecting rotation of the electric blower, a power control means for controlling electric power of the electric blower in accordance with an output of the rotation speed detecting means, and a power supply voltage. A vacuum cleaner comprising a voltage detecting means for detecting fluctuations in the electric blower, wherein the power control means performs power control when a power supply voltage fluctuation is detected by the voltage detecting means when the electric blower is not power-controlled.