JPH0685756B2 - Vacuum cleaner - Google Patents

Description

FIELD OF THE INVENTION The present invention relates to household and industrial vacuum cleaners.

2. Description of the Related Art In recent years, along with westernization of daily life, rugs are often used as floor materials in rooms, and in order to absorb dust from the insides of rugs, rugs with a high suction work rate are required. , The electrical input to the blower motor has also increased.

Further, the rotation speed of the blower electric motor of the electric vacuum cleaner can be selectively controlled by the operation unit at hand according to the object to be cleaned, and the cleaning can be performed with the minimum required intake air volume, thereby saving power and reducing noise. In addition, a dust sensor is provided between the suction port and the dust collector, and the rotation number of the blower motor is automatically increased when dust is detected.

Hereinafter, the conventional vacuum cleaner as described above will be described with reference to the drawings. FIG. 3 is an electric circuit diagram of a conventional vacuum cleaner. In FIG. 3, reference numeral 1 denotes a variable resistor for continuously variably controlling the number of revolutions of the blower motor 2 in the hand operation part of the electric vacuum cleaner, which is output from the phase control circuit 3 according to its resistance value. The bidirectional thyristor 4 changes the conduction angle of the AC power supply 5 with respect to the blower motor 2 according to the gate signal to change the rotation speed of the blower motor 2. Reference numeral 6 is an electromagnetic relay that closes the contacts and short-circuits the variable resistor 1 in response to a dust detection signal from the dust sensor circuit 7. Reference numeral 8 is a light emitting diode (hereinafter referred to as LED), and 9 is a current limiting resistor of the LED 8. Reference numeral 10 denotes a phototransistor that receives light from the LED 8. The phototransistor 10 changes the intensity of light from the LED 8 caused by the presence or absence of sucked dust into a current change, and the dust sensor circuit 7 detects this and outputs a dust detection signal. Reference numeral 11 is a load resistance of the phototransistor 10.

FIG. 4 is an external view of the electric vacuum cleaner. In FIG.
Reference numeral 12 is a suction port for sucking dust from the floor, and an electric cleaning device including the blower electric motor 2 and a dust collector through a pipe 13, a hand operation unit 14 for changing the rotation speed of the blower electric motor 2, and a hose 15. It is connected to the body 16 of the machine. 17 is a pipe 13
The LED 8 and the phototransistor 10 are installed in the dust sensor section provided in the.

FIG. 5 is an enlarged view of the hand operation unit 14 of FIG. In FIG. 5, reference numeral 18 denotes a knob connected to the slider of the variable resistor 1 shown in FIG. 3, and by changing this knob 18, the blower air is blown so as to obtain a suction air volume according to a cleaning object such as a carpet or a tab. The rotation speed of the electric motor 2 is set.

The operation of the electric vacuum cleaner configured as described above will be described below.

First, by operating the variable resistor 1 built in the hand operation unit 14 with the knob 18, the blower motor 2 is passed through the bidirectional thyristor 4 controlled by the phase control circuit 3.
A phase-controlled current is applied to the blower motor 2, and the blower motor 2 rotates at a set rotation speed, enabling cleaning.

In the case of this example, when the resistance value of the variable resistor 1 increases, the rotation speed of the blower electric motor 2 decreases, and when the resistance value is short-circuited, the rotation speed becomes maximum. Therefore, by operating the variable resistor 1 according to the type of the object to be cleaned, the intake air volume according to the type of the object to be cleaned can be obtained.

Next, when the dust is sucked from the suction port 12 and passes through the dust sensor unit 17 composed of the LED 8 and the phototransistor 10, the light from the LED 8 is blocked by the dust and does not reach the phototransistor 10, and the dust sensor circuit 7 operates to close the contact of the electromagnetic relay 6. Therefore, the variable resistor 1 is short-circuited, and the blower motor 2 rotates at the maximum rotation speed.
Furthermore, after a certain period of time (3 seconds in the case of the embodiment) elapses when there is no dust passing through the dust sensor unit 17, the contact of the electromagnetic relay 6 opens and returns to the rotation speed set by the variable resistor 1. This operation pattern of the blower motor 2 is shown in FIG. 2 (B).

However, in the conventional configuration as described above, even if the knob position of the variable resistor 1 of the hand operation unit 14 is set to, for example, the "curtain" position of the minimum rotation speed, suction is performed. If there is dust, the number of rotations of the blower electric motor 2 becomes the maximum, and there is a problem in operability such that the curtain is sucked in and the sound becomes loud.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide an electric vacuum cleaner that has improved operability and can be cleaned quietly.

Means for Solving the Problems In order to solve the above problems, the electric vacuum cleaner of the present invention sets a minimum rotation speed of the blower electric motor and a setting unit for changing the set rotation speed of the blower electric motor at the hand operation unit. The minimum rotation speed setting unit, the dust sensor unit provided between the suction port or the suction unit and the dust collector, and when the dust sensor unit detects dust, the setting of the setting unit from the minimum rotation number of the minimum rotation speed setting unit is performed. It is provided with a switching means for switching to the rotation speed and a phase control circuit for controlling the rotation of the blower motor at the rotation speed switched by the switching means.

Action With the above configuration, if there is no dust passing through the dust sensor,
The blower motor rotates at a constant number of revolutions regardless of the settings on the hand control unit, and when the dust sensor detects dust that has been sucked in, it is switched and controlled by the control unit to set the number of revolutions set on the hand control unit. Since the fan motor rotates, it can be cleaned gently at a low speed in a place with little dust, and can be powerfully cleaned at a high speed in a place with a lot of dust according to the object to be cleaned. Moreover, in the case of the curtain with the minimum number of rotations, even if dust is detected and the rotation changes according to the cleaning target, there is no drastic level increase as in the past, and there is no sudden volume change. Don't be surprised by the sudden loud noise.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. It should be noted that components having the same effects as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted.

FIG. 1 is a circuit diagram of an electric vacuum cleaner showing an embodiment of the present invention. In FIG. 1, one end of the resistor 21 is the phase control circuit 3
Connected to one end of the variable resistor 1 connected to the other end, the other end is connected to the contact a of the electromagnetic relay 22 as a control means, the contact b is connected to the slider of the variable resistor 1, and the contact c is a common contact. Are connected to the phase control circuit 3.

The operation will be described below. In FIG. 1, the variable resistor 1 is operated to control the rotation of the blower motor 2. At this time, if there is no dust that is sucked and passes through the dust sensor unit 17,
The contact c of the electromagnetic relay 22 is connected to the side of the resistor 21 and is connected to the side of the resistor 21, and regardless of the value of the variable resistor 1 of the hand operation unit 14, the blower motor 2 has the rotation speed set by the resistor 21. It rotates a certain amount.

Next, when the dust sensor unit 17 detects dust, the dust sensor circuit 7
The contact c of the electromagnetic relay 22 is switched to b by the output of the above and is connected to the slider side of the variable resistor 1 and rotates at the rotation speed of the blower electric motor 2 set by the variable resistor 1 of the hand operation unit 14. That is, when the knob of the variable resistor 1 is at the position of the curtain, sofa, fold, or carpet to be cleaned, as shown in FIG. 5, the blower motor rotates corresponding to each position.

As a result, as shown in FIG. 2 (A), when the dust sensor unit 17 does not detect dust, the blower electric motor 2 rotates at a constant low speed set by the resistor 21. On the other hand, when dust is detected, the number of rotations can be set to an appropriate number according to the cleaning target set by the hand operation unit 14. The operating characteristics of the blower motor 2 shown in FIG. 2 (A) can be designed relatively freely by the ratio of the resistance values of the variable resistor 1 and the resistor 21.

EFFECTS OF THE INVENTION As described above, according to the present invention, when dust is not detected by the dust sensor unit, the blower motor is constantly rotated regardless of the rotation speed setting in the hand operation unit, and when dust is detected, the hand operation unit is detected. Switching control is performed to increase the rotation speed of the blower motor up to the rotation speed set in, so it is possible to clean quietly at a certain low speed rotation in a place with little dust, and in a place with a lot of dust, depending on the cleaning target. Also, the rotation speed of the blower motor is increased, and high-speed rotation enables powerful cleaning.
Moreover, since the change to high-speed rotation is performed by switching to the number of rotations set according to the cleaning target, there is no drastic level-up, which is seen when the conventional curtain is the cleaning target, and there is no sharp increase. You won't be surprised by a loud volume change. Further, when dust is not detected, the blower motor is rotated at the lowest rotation speed, so that power consumption can be reduced.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an electric vacuum cleaner showing an embodiment of the present invention,
2 (A) and 2 (B) are operation pattern diagrams of the fan motor according to the embodiment of the present invention and the conventional example, FIG. 3 is a circuit diagram of the conventional electric vacuum cleaner, and FIG. 4 is an external view of the electric vacuum cleaner. Figure, fifth
The drawing is an enlarged detailed view of the hand operation unit in FIG. 1 ... Variable resistor, 2 ... Blower motor, 3 ... Phase control circuit, 4 ... Bidirectional thyristor, 7 ... Dust sensor circuit, 12 ... Suction port, 14 ... Hand operation part, 16 ... … Main body (dust collector), 17 …… Dust sensor, 22 …… Electromagnetic relay (control means).

Claims (1)

[Claims] 1. A setting unit for varying a set rotation speed of a blower motor with a hand operation unit, a minimum rotation speed setting unit for setting a minimum rotation speed of the blower motor, and a suction port or a portion between a suction port and a dust collector. A dust sensor unit, a switching unit for switching the minimum rotation speed of the minimum rotation speed setting unit to the set rotation speed of the setting unit when dust is detected by the dust sensor unit, and a blower motor at the rotation speed switched by the switching unit. Vacuum cleaner with a phase control circuit that controls the rotation of the.