JPH04193242A - Display circuit for vacuum cleaner - Google Patents

Abstract

PURPOSE:To enable a user to know about a proper time for exchanging a dust bag by arranging a control element for controlling motor rotational-frequency, a plurality of pressure sensors, display elements, and the like, and by connecting one power source among the pressure sensors, to a commercial power source, to provide the input of potential difference between both the ends of the control element, to other power sources. CONSTITUTION:To a commercial power source 11, a motor 12 and a TRIAC (control element) 13 are connected in series, and to the gate of the control element 13, a phase controlling circuit 14 is connected, and by the circuit, the rotational frequency of the motor 12 is controlled. Besides, a plurality of pressure sensors 20, 38 arranged in an air suction course, comparators 22-24, 40-42 with different comparing levels connected to the respective output sides of the pressure sensors 20, 38 and display elements 30-32, 48-50 to be connected to the output sides of the comparators 22-24, 40-42 and for lighting according to output levels, are arranged. One power source of the pressure sensors 20, 38 is connected to the commercial power source 11, and the input of potential difference between both the ends of the control element 13 to the other power source is provided. As a result, a time for exchanging a dust bag can be displayed in multi-step.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a display circuit for detecting clogging of a dust collector in a vacuum cleaner.

2. Description of the Related Art In recent years, vacuum cleaners have come to be equipped with means for displaying the amount of dust collected. Conventionally, the electric circuit of this type of vacuum cleaner has generally been as shown in FIG. This will be explained below with reference to the drawings.

As shown in the figure, a motor 2 connected to a power source 1 is connected to a triac 3, and the triac 3 is controlled by a phase control circuit 4 to control the rotation speed of the motor 2 and change the suction force of the vacuum cleaner. I try to do that.

When dust accumulates in the garbage bag inside the vacuum cleaner, a pressure switch 5 installed in the air suction flow path closes and a lamp 6 lights up to notify the user that it is time to replace the garbage bag. It had become.

Problems to be Solved by the Invention In the display circuit of such a conventional vacuum cleaner, the setting of the pressure switch 5 is such that it operates when the suction force is maximum and the garbage bag is full of dust. Because there are
If the suction force is low, even if the garbage bag is full of dust, the pressure switch 5 will not close and the display will not be displayed. I don't know when to prepare a replacement garbage bag,
There was a problem with it being difficult to use.

The present invention solves the above-mentioned problems, and a first object of the present invention is to display the garbage bag replacement time in multiple stages even when the suction power of the vacuum cleaner is high or low.

The second purpose is to appropriately display the time to replace the garbage bag by switching the display element, regardless of whether the suction force of the vacuum cleaner is large or small.

Means for Solving the Problems In order to achieve the above object, the present invention provides a first means for solving the problems, which includes a control element that controls the rotational speed of a blowing motor, and a plurality of pressure control elements provided in an air suction path. A sensor, a comparator with a different comparison level connected to the output side of each of the pressure sensors, and a display element connected to the output side of the comparator and lit according to the output level, at least one of the pressure sensors One power source is connected to a commercial power source, and the other pressure sensor is configured to input the potential difference between both ends of the control element.The second problem solving means is a pressure sensor connected to a commercial power source. The device has a comparator section that cuts off the power output when a potential difference occurs between both ends of the control element.

Effects In the above configuration, the effects of the first problem solving means are as follows:
A pressure sensor connected to a commercial power source detects the air suction pressure regardless of the potential across the control element, outputs it to the comparison means, compares this signal with a set value, and can be lit by the display element, and other The pressure sensor detects the pressure when a potential across the control element is generated and outputs it to the comparison means, compares this signal with a set value, and lights up the display element. In addition, the second problem-solving means works by cutting off the power output when a potential difference occurs between the two ends of the control element of the pressure sensor connected to the commercial power supply by the comparison section, and turning off the display element due to a change in the rotation of the motor. let

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2.

As shown in the figure, a motor 12 and a triac 13 are connected in series to a commercial power source 11.

A phase control circuit 14 is connected to the gate of the triac 13, and this circuit controls the rotation speed of the motor.

In addition, the commercial power supply 11 has a first diode 15 and a first
A power supply resistor 16 is connected thereto, and a first Zener diode 17 and a first electrolytic capacitor 18 constitute a first DC power supply circuit. This first DC power supply circuit includes a first constant current source 19 and a first pressure sensor 20.
is connected, and its output is amplified by the first amplifier 21. The output of the first amplifier 21 is the output of the first amplifier 21. connected to one input terminal of the second and third comparators 22, 23.24,
The first to fourth resistors 25 and 26 are connected to the input side of each comparator.
．． 27.28 is connected. Also number 1. A fifth resistor 2 is connected to the output of the second and third comparators 22.23°24.
9, first to third light emitting diodes (hereinafter referred to as LEDs) 30, 31, 32 are connected as shown in the figure.

Further, the anode of a second diode 33 is connected to the connection point between the motor 12 and the triac 13, the second power supply resistor 34 is connected to the cathode, and the second Zener diode 35 and the second electrolytic The capacitor 36 constitutes a second DC power supply circuit. A second constant current source and a second pressure sensor 38 are connected to this second DC power supply circuit, and this output is sent to a second amplifier 3.
It is designed to be amplified by 9. second amplifier 3
The output of 9 is connected to the output of the 4th to 6th comparators 40, 41, 42, and the 10th input side is connected to the 6th to 9th resistors 43, 44, 45, 46 as shown in the figure. There is. Further, as shown in the figure, fourth to sixth LEDs 48, 49, and 50 are connected to the output side of each comparator through a tenth resistor 47.

Here, the first pressure sensor 20 and the second pressure sensor 38 and the first amplifier 21 and the second amplifier 39 are the same, and the operations of the third comparator 24 and the sixth comparator 42 are the same. The level setting is as follows: 3rd comparator>6th comparator.

The main body 55 of the vacuum cleaner has a hose 562, a handle 57. It is composed of an extension tube 58 and a floor nozzle 59, and a display 60 is attached to the upper part of the main body 55.

To explain the operation in the above configuration, first, the motor 12
When the is rotating at its maximum, the potential difference of the triac 13 is approximately OV, so the voltage of the second Zener diode 35 is also Ov, so that the fourth to sixth LEDs 48
．． 49.50 will never light up. As dust accumulates in the garbage bag and the pressure in the air flow path gradually increases, the output voltage of the first pressure sensor 20 also gradually increases, which is amplified by the first amplifier 21 and ~Third comparator 22, 23.24. When the comparison level is reached, the first to third LEDs 30, 31, and 32 will be lit in order, informing the user that it is time to replace the garbage bag. Next, the phase of the motor is controlled by the phase control circuit 14, and the motor 1
2, a potential difference occurs between both ends of the triac 13, and the voltage rectified by the second diode 33 and the second power supply resistor 34 is applied to the second Zener diode 35 and the second electrolyte. Stabilized by the capacitor 36, the second pressure sensor 38 also operates. Here, once the dust has accumulated in the garbage bag, the pressure in the air flow path will not become very high, but in this state, the output level of the second amplifier 39 is set to a level that turns on the sixth comparator 42. If the garbage bag is left in place, the sixth LED 50 lights up, allowing the user to know when it is time to replace the garbage bag.

In this way, according to this embodiment, the time to replace the garbage bag can be seen at a glance regardless of the rotation speed of the motor 12, and the LE
Since the D lights are lit one after the other, you can know in advance how much garbage you can suck up.

FIG. 3 shows an embodiment related to the second problem-solving means of the present invention. In each figure, the same parts are numbered the same as in FIG. 1 described above. The difference from the first problem solving means is that a comparator section 61 is provided. In other words, the power of the seventh comparator 51 is supplied from the second power supply, the negative power is biased by the 11th and 12th resistors 52 and 53, and the 10th power is biased by the 13th resistor 54. It is at ground level. The output of this seventh comparator 51 is connected to the first power supply as shown.

To explain the operation in the above configuration, first, the motor 12
When the TRIAC 13 is rotating at its maximum, the potential difference of the triac 13 is approximately OV, so the voltage of the second Zener diode 35 is also OV, so that the fourth to sixth LEDs 48
, 49.50 will never light up. As dust accumulates in the garbage bag and the pressure in the air flow path gradually increases, the output voltage of the first pressure sensor 20 also gradually increases, which is amplified by the first amplifier 21 and ~1 when the comparison level of the third comparator 22, 23, 24 is reached
~The third LED 30, 31, and 32 will light up to notify the user that it is time to replace the garbage bag. Next, the phase of the motor is controlled by the phase control circuit 14, and the motor 12
When the rotational speed of the triac 13 decreases, a potential difference occurs between both ends of the triac 13, and the voltage rectified by the second diode 33 and the second power supply resistor 34 is transferred to the second Zener diode 35 and the second electrolytic capacitor. 36, and the second pressure sensor 38 is also activated.

Here, once the dust has accumulated in the garbage bag, the pressure in the air flow path does not become very high, but in this state, the output level of the second amplifier 39 is set to a level at which the sixth comparator 42 turns on. When set to , the sixth LED 50 lights up, making it possible to notify the user of the time to replace the garbage bag.

Also, at this time, the seventh comparator 51 is also in the operating state and is turned on, so the second power supply is at the ground level.
The first to third LEDs are never lit.

In this way, according to this embodiment, no matter what the rotational speed of the motor 12 is, it can be seen at a glance whether it is time to replace the garbage bag, and the LE
Since D lights up sequentially, you can know in advance how much dirt can be sucked up, and when the motor rotation is strong or weak, one LED will not light up, so there will be no misjudgment. It is something.

Effects of the Invention As is clear from the above description of the embodiments, the display circuit for a vacuum cleaner of the present invention includes a control element for controlling the rotational speed of a blowing motor, and a plurality of control elements provided in the air suction path. a pressure sensor, a comparator with a different comparison level connected to the output side of each of the pressure sensors, and a display element connected to the output side of the comparator that lights up according to the output level. At least one power source is connected to a commercial power source, and the other pressure sensor is configured to input the potential difference between both ends of the control element, so that the user can determine the appropriate time to replace the garbage bag regardless of the speed of the motor. It has significant practical value, as it can inform users and improve ease of use.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a display circuit of a vacuum cleaner according to an embodiment of the first problem-solving means of the present invention, FIG. 2 is an external perspective view of the vacuum cleaner, and FIG. FIG. 4 is a circuit diagram of a display circuit of a vacuum cleaner according to an embodiment related to problem solving means 2, and FIG. 4 is a circuit diagram of a conventional vacuum cleaner. 11...Motor, 13...Control element,
20.38...Pressure sensor, 22.23,2
4.40.41゜42...Comparator, 30,31
．． 32, 48, 49° 50...Display element. Name of agent: Patent attorney Haruaki Ogata and 2 others Figure 2

Claims (2)

[Claims] (1) A control element that controls the rotation speed of a blower motor;
Multiple pressure sensors installed in the air suction path,
Comparators with different comparison levels are connected to the output side of each of the pressure sensors, and a display element is connected to the output side of the comparator and lights up according to the output level, and at least one of the pressure sensors has a power source. A display circuit for a vacuum cleaner, which is connected to a commercial power source, and the other pressure sensor inputs the potential difference between both ends of the control element. (2) The display circuit for a vacuum cleaner according to claim 1, wherein the pressure sensor connected to the commercial power source has a comparison section that cuts off the power output when a potential difference occurs between both ends of the control element.