JPH0685757B2 - 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, with the westernization of life, rugs are often used as floor materials for rooms, and in order to absorb dust from the inside of the rug's hair, a material with a high suction work rate is required. As a result, the electric 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 is a variable resistor for continuously variably controlling the number of revolutions of the blower motor 2 at the hand operation part of the electric vacuum cleaner, which is output from the phase control circuit 3 according to the resistance value. The bidirectional thyristor 4 changes the conduction angle of the exchange power source 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 contact by a dust detection signal from the dust sensor circuit 7 and short-circuits the variable resistor 1. 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 is a phototransistor that receives the light from the LED 8. The phototransistor 10 changes the intensity of the 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 denotes a suction port for sucking dust on the floor, and an electric vacuum cleaner having a blower electric motor 2 and a dust collector built therein through a pipe 13, a hand operation unit 14 for changing the rotation speed of the blower electric motor 2, and a hose 15. Is connected to the main body portion 16. Reference numeral 17 denotes a dust sensor unit provided on the pipe 13, in which the LED 8, the phototransistor 10 and the like are installed.

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 varying the 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 incorporated 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.
The electric motor whose phase is controlled is added to the blower motor 2, and the blower motor 2 rotates at the set rotation speed to perform cleaning. In the case of this example, if the resistance value of the variable resistor 1 increases, the rotation speed of the blower motor 2 decreases, and the rotation speed becomes maximum when the resistance value is short-circuited. 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 dust is sucked from the suction port 12 and passes through the dust sensor section 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,
The blower motor 2 will rotate 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 good operability and can be cleaned quietly.

Means for Solving the Problems In order to solve the above problems, an electric vacuum cleaner according to the present invention has a setting unit for changing a set rotation speed of a blower motor at a hand operation unit and a rotation speed set by the setting unit. The rotation speed subtraction unit that reduces the rotation speed, the phase control circuit that controls the rotation of the blower motor at a rotation speed that is reduced by a certain proportion from the set rotation speed, and the dust sensor provided between the suction port or the suction port and the dust collector. Section and switching means for outputting the set rotation speed of the setting section to the phase control circuit without passing through the subtraction section when dust is detected by the dust sensor section.

Action With the above configuration, if there is no dust passing through the dust sensor,
When the blower motor is rotated at a rotational speed that is lower than the rotational speed set by the hand operation unit by a fixed ratio, and when the dust sensor unit detects the dust that has been sucked in, the switching control is performed by the control unit.
Since the blower motor rotates at the number of revolutions set by the hand control part, it can be cleaned gently at a low speed depending on the target to be cleaned in a place with little dust, and depending on the target to be cleaned in a place with a lot of dust. The proper rotation speed of the blower motor is restored, and high-speed rotation enables powerful cleaning. Moreover, since the change to high-speed rotation is performed at a fixed rate, there is no big level-up that is seen when conventional curtains are targeted for cleaning, and you will not be surprised by sudden volume changes. .

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
, The other end is connected to the slider of the variable resistor 1, the contacts of the electromagnetic relay 22 are connected to both ends of the resistor 21,
Resistor 21 is short-circuited when the contact is closed.

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 point of the electromagnetic relay 22 is opened, and the combined resistance seen from the phase control circuit 3 is the sum of the resistance values of the variable resistor 1 and the resistance 21 in series, which is lower than the rotation speed set by the hand operation unit 14. The rotation speed of the blower electric motor 2 is reduced by a fixed rate.

Next, when the dust sensor unit 17 detects dust, the dust sensor circuit 7
Output closes the contact of the electromagnetic relay 22 and short-circuits the resistor 21, and the combined resistance value seen from the phase control circuit 3 is the resistance value of only the variable resistor 1. That is, when the knob of the variable resistor 1 is located at the position to be cleaned, such as the curtain, the sofa, the fold, and the carpet as shown in FIG. 5, the blower motor 2 is rotated corresponding to each position.

As a result, when the dust sensor unit 17 detects dust as shown in FIG. 2 (A), the rotation speed of the blower motor 2 becomes a ratio according to the setting of the variable resistor 1 of the hand operation unit 14, and the rotation speed is changed. Can be increased. Blower motor 2 shown in FIG. 2 (A)
The operating characteristics of can be designed relatively freely by the ratio of the variable resistor 1 and the resistor 21.

EFFECTS OF THE INVENTION According to the present invention as described above, when dust is not detected by the dust sensor unit, the rotation speed of the blower motor is reduced by a fixed ratio from the rotation speed set by the hand operation unit, and dust is detected. Sometimes, switching control is performed so that the blower motor is rotated at the number of rotations set by the hand control unit, so in a place with little dust, you can gently clean at a low rotation speed according to the object to be cleaned, and in a place with a lot of dust. Then, it returns to the proper rotation number of the blower motor according to the cleaning target, and powerful cleaning can be performed at high speed. Moreover, since the change to high-speed rotation is performed at a constant rate, there is not a large level increase that can be seen when a conventional curtain is targeted for cleaning, and it may be surprised by a sudden volume change. Absent. Also, when cleaning the curtain, the set rotation speed is set low, but the rotation speed is further reduced if dust is not detected, so it is possible to reliably prevent the curtain from being sucked in, and to easily install the suction port of the vacuum cleaner from the curtain. The cleaning operation is good.

[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 changing a set rotation speed of a blower motor by a hand operation unit, a rotation speed subtraction unit for decreasing a rotation speed set by the setting unit by a fixed ratio, and a rotation speed reduced by a fixed ratio from the set rotation speed. The phase control circuit that controls the rotation of the blower motor by the number, the dust sensor unit provided between the suction port or the suction unit and the dust collector, and if dust is detected by the dust sensor unit, it is set without using the subtraction unit. An electric vacuum cleaner having switching means for outputting the set rotation speed of the unit to a phase control circuit.