JPH0458928A - Vacuum cleaner - Google Patents

Abstract

PURPOSE:To safely execute the dust suction quantity display by a small size and with high accuracy by constituting the dust suction quantity display part so that a DC voltage outputted from a detecting part and plural reference voltages whose values are different stepwise are compared by plural comparators, and a light emission implement is connected to output sides of each comparator, respectively. CONSTITUTION:A current flowing in a motor 5 is detected by a current transformation line 6, converted to a DC voltage by a diode 10 and a smoothing capacitor 11, voltage-divided by resistances Ra, Rb, and inputted to an inversion input terminal of a comparator ICI. On the other hand, to a non-inversion input terminal of the comparator IC1, an output voltage of a stabilizing circuit 9 is voltage-divided by resistances R1a, R1b and applied as a reference voltage. In such a state, a current flowing to a motor of a motor-driven air blower, that is, a conversion voltage and the reference voltage are compared by the comparator IC1, and in the case of exceeding the reference voltage, as for an input voltage to the comparator IC1, an inversion input terminal voltage becomes higher than a non-inversion input terminal voltage and an LFD lamp D1 is not turned on. However, when a dust suction filter of the vacuum cleaner is clogged and a motor current of the motor-driven air blower drops, as for the input voltage of the comparator ICI, the inversion input terminal voltage becomes lower than the non-inversion input terminal voltage and the LED lamp D1 is turned on.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a vacuum cleaner, and more particularly to a vacuum cleaner equipped with a dust suction amount display function that displays the degree of clogging of a dust suction filter.

(B) Conventional technology Conventionally, in this type of vacuum cleaner, the motor current of the electric blower is detected.The current detection method is to detect the terminal voltage of a resistor inserted in series with the electric blower motor. What is detected is known (for example,
1-42574).

(c) Problems to be Solved by the Invention However, in such conventional vacuum cleaners, since the motor current of the electric blower is large, a resistor with a large capacity and size is required, and the resistor itself generates heat. There was a problem.

This invention was made in consideration of these circumstances,
The present invention provides a vacuum cleaner that uses a current transformer as a means for detecting the motor current of an electric blower.

(d) Means for Solving the Problems This invention provides an electric blower using an AC commutator motor and a vacuum cleaner equipped with a dust intake amount display section, which includes a current transformer for detecting the motor current of the electric blower; A detection unit that detects the output current of this current transformer as a DC voltage is provided, and a plurality of comparators compare the DC voltage output from this detection unit with a plurality of reference voltages with stepwise different values. This vacuum cleaner is characterized in that the dust suction amount display section is configured such that a light emitting device is connected to each output side of the vacuum cleaner.

(E) Function When the dust filter of the vacuum cleaner becomes clogged, the current flowing to the AC commutator motor of the electric blower decreases. The current transformer detects and outputs this motor current, and the detection unit converts the output current of the current transformer into a DC voltage. is input to the comparator of By comparing these two voltage values with each comparator, each light emitting device lights up when the voltage is equal to or less than the reference voltage. In other words, it is a vacuum cleaner equipped with a dust suction amount display device in which the number of light-emitting devices that light up in accordance with the dust suction amount increases sequentially, and it is possible to display the dust suction amount in a small size, safely, and with high accuracy.

(f) Examples The present invention will now be described in detail based on examples shown in the drawings. This invention is not limited by this.

FIG. 1 shows a perspective view of the main body of a vacuum cleaner according to an embodiment of the present invention, and includes a main body case part 11 containing an electric blower (not shown) using an AC commutator motor, and a main body. The dust suction amount display device 3 and the machine switch 4 installed on the top surface of the case part 1 are shown.

FIG. 2 is an electrical circuit diagram of one embodiment shown in FIG.
00v line with fuselage switch 4, AC commutator motor 5,
A current transformer 6 is arranged, and a secondary DC power supply circuit is constituted by a transformer 7, a bridge circuit 8, a stabilizing circuit 9, and the like. The output of the current transformer 6 is connected to the inverting input terminal of each of the comparators ICl-IC3 via a diode 10, a smoothing capacitor 11, and resistors R2L and Rb. The output of the stabilizing circuit 9 is connected to a comparator IC via resistors R1a, R1b, R2a, R2b and R3a, R3b, respectively.
It is connected to the non-inverting input terminals of I, IC2, and IC3. The outputs of the comparators ICI, IC2, rc3 are connected to the LED lamps DI, D2. Connected to D3.

FIG. 3 is a detailed view of the current transformer shown in FIG. 2, which is composed of a ferrite core 62L and a winding 6b, and has a structure in which a motor power line B of an electric blower passes through the current transformer. Note that Ro is the winding 6b
is the output resistor connected across the .

In FIG. 2, the current flowing through the motor 5 is detected by a current transformer 6, converted to a DC voltage by a diode 10 and a smoothing capacitor 11, divided by a resistor RaRb, and inputted to an inverting input terminal of a comparator ICI. On the other hand, the output voltage of the stabilizing circuit 9 is divided by resistors R1a and R1b and applied as a reference voltage to the non-inverting input terminal of the converter ICI.

Here, the current flowing through the motor of the electric blower, that is, the converted voltage, is compared with the reference voltage by the comparator ICI, and if it is higher than the reference voltage, the input terminal to the comparator C1 is as follows: Inverting input terminal voltage > Non-inverting input terminal voltage, and the LED lamp DI does not light up. However, when the dust filter of the vacuum cleaner becomes clogged and the motor current of the electric blower decreases, the input voltage of the comparator ICI becomes the inverting input terminal voltage and the non-inverting input terminal voltage, and the LED lamp D1 lights up.

In this embodiment, the converted voltage is further connected to the resistor R2a.

It is compared with a plurality of reference voltages divided stepwise through R2b, R3a, and R3b by a comparator IC21C3. Since the resistance ratio of these voltage dividing resistors is set to the relationship R1a/R1b<R2a/R2b<R3a/R3b, each comparator C1, IC
2, the non-inverting input voltage of IC3, that is, the reference voltage, are set to Vl, V2. If V3, then V 1 >V 2 >V
There will be a relationship of 3. As a result, as the converted voltage decreases, the LED lamps D2 . D3 lights up sequentially.

Here, as shown in FIG. 4, the current value flowing through the motor of the electric blower of the vacuum cleaner is highest in the initial state, and the current value decreases as dust is sucked in and the filter section becomes clogged. Therefore, in this embodiment, the LED lamp starts from a non-lit state, and as the filter section becomes clogged, the LED lamp changes to D1. D2 lights up, and finally all the LED lamps light up.

(G) Effects of the Invention According to the present invention, a large series resistor that causes a problem of heat generation for current detection is not required, and a vacuum cleaner equipped with a small, safe and highly accurate dust suction amount display device can be obtained. It will be done.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a vacuum cleaner showing an embodiment of the present invention;
Fig. 2 is an electric circuit diagram of one embodiment shown in Fig. 1, Fig. 3 is a detailed diagram of the current transformer shown in Fig. 2, and Fig. 4 shows the effects of electric blower on the degree of clogging of the vacuum cleaner's dust filter. 3 is a graph showing changes in motor current. 5... AC commutator motor of electric blower, 6...
・Current transformer for motor current detection, 10... Diode for current transformer output detection, 11.
...Smoothing capacitor, ICI~IC3...Comparator, DI-D3...
...LED lamp, R1a=R3b...Resistance for reference voltage division.

Claims (1)

[Claims] 1. In a vacuum cleaner equipped with an electric blower using an AC commutator motor and a dust suction amount display section, a current transformer is used to detect the motor current of the electric blower, and the output current of this current transformer is detected as a DC voltage. A detection unit is provided, and the DC voltage output from the detection unit is compared with multiple reference voltages with stepwise different values using multiple comparators, and a dust suction device is connected to the output side of each comparator. A vacuum cleaner characterized by comprising a quantity display section.