JPH04152926A - Vacuum cleaner - Google Patents

Abstract

PURPOSE:To execute the operation even when suction force is small by providing plural pressure switches which are provided in an air suction passage and whose setting operation pressure is different, and displaying a change time of a dust bag by a display element operated by a potential difference of both ends of a control element, in the case suction force is small. CONSTITUTION:When a motor 11 is subjected to phase control by a phase control circuit 14, and the number of revolutions of the motor 11 becomes lower, a potential difference is generated in both ends of a control element 12, a voltage rectified by a diode 23 and a power source resistance 24 is stabilized by a Zener diode 25 and a capacitor 26, and by resistances 27, 28, a bias is applied to the base of a transistor 29. When dust collects fully in a dust bag, even if pressure in an air passage does not reach operating pressure of a first pressure switch, when it reaches operating pressure of a second pressure switch 22, a second pressure switch 22 is turned on, therefore, the transistor 29 is also turned on, a second display element 21 is lighted and can inform a change time of the dust bag to a user. In such a way, even if the number of revolutions of the motor 11 becomes lower, a second display element 21 can be lighted, and the change time of the dust bag can be known at a glance.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a vacuum cleaner having a function of notifying the user when it is time to replace the garbage bag.

BACKGROUND OF THE INVENTION In recent years, there has been a demand for vacuum cleaners that are equipped with a function to notify the user when it is time to replace the garbage bag to notify the user when it is time to replace the garbage bag, depending on the state of the garbage inside the bag, even when the suction power is controlled. There is.

Conventionally, this type of vacuum cleaner has generally had a configuration as shown in FIG. The configuration will be explained below.

As shown in the figure, a motor 2 connected to a power source 1 is connected in series with a control element 3 such as a bidirectional sirinuta, and the rotation speed is controlled by a phase control circuit 4 to change the suction force. was. When dust accumulates in the garbage bag inside the electric return machine, the pressure switch 6 installed in the air suction channel turns on and the lamp 6 lights up, notifying the user that it is time to replace the garbage bag. It was something.

Problems to be Solved by the Invention In such conventional vacuum cleaners, the operating pressure of the Pressure Kanuino 6 is set to the maximum suction force, and the vacuum cleaner operates when the garbage bag is full of dust. Therefore, if the motor 2 is used with a low rotational speed and a small suction force, there is a big problem in that even if the garbage bag is full of dust, it will not be displayed.

The present invention is intended to solve the above-mentioned conventional problems, and its first object is to display the time to replace the garbage bag using a display element even when the suction force is small. The second objective is to appropriately display the time to replace the garbage bag with a single display element, regardless of whether the suction force is large or small.

Means for Solving the Problems In order to achieve the first object, the present invention includes a plurality of pressure switches disposed in the air suction flow path and having different set operating pressures, and at least one of the pressure switches is connected between the power supply and the first display element, and the other pressure switch is connected to the lighting control circuit of the second display element, which is operated by the potential difference between both ends of the control element connected in series with the motor. This is a means of solving the first problem.

In order to achieve the second objective, the first display element and the second display element in the first problem-solving means are made common.

Effect of the present invention By using the above-mentioned first problem solving means, when the suction force is large, the time to replace the garbage bag can be indicated by the first display element, and when the suction force is small, a display is displayed at both ends of the control element. Since a potential difference is generated, the time to replace the garbage bag can be displayed on the second display element.

Moreover, with the second problem solving means, the time to replace the garbage bag can be displayed on a single display element regardless of the magnitude of the suction force.

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

As shown in the figure, the motor 11 is connected to a power source 13 with a control element 12 such as a bidirectional thyristor connected in series. A phase control circuit 14 is connected to the gate of the control element 12, and the rotation speed of the motor 11 is controlled by this phase control circuit 14. In addition, the power supply 13 has a diode 16. Power supply resistance 16. A first pressure switch 17 and a first display element 18 are connected in series. This first
A diode 19 is connected in antiparallel to the display element 18 of. The lighting control circuit 2o controls the lighting of the second display element 21, and is connected to a second pressure switch 22, and the anode of a diode 23 is connected to the connection point between the motor 11 and the control element 12. A power supply resistor 24 is connected to the cathode, and a Zener diode 25. capacitor 26
This constitutes a DC power supply circuit. The base of a transistor 29 is connected to the resistors 27 and 28 connected to this DC power supply circuit, and the second pressure switch 22 and the second display element 21 are connected in series to the collector of the transistor 29 via a limiting resistor 3o. ing. Here, the set operating pressure of the first pressure switch 17 is set higher than the set operating pressure of the second pressure switch 22.

The motor 11 is connected to the vacuum cleaner body 3 together with a garbage bag (not shown).
1 and connected to this vacuum cleaner body 31.
A hand hand/l/33 is provided at the tip of the extension tube 34. A floor nozzle/1/3B is connected, and a phase control circuit 14 is installed inside the hand handle 33. Display section 3 on the vacuum cleaner body 31
6, the first display element 18 or the second display element 2
The lighting state of No. 1 can be easily recognized from the outside.

To explain the operation in the above configuration, first, the motor 11
When the zener diode 2 is rotating at its maximum, the potential difference across the control element 12 is approximately oV.
Since the voltage of 5 is also oV, the second display element 21 does not light up. Here, when the garbage bag is full of dust and the pressure in the air flow path reaches the operating pressure of the first pressure switch 17 installed in the air flow path, the first pressure switch 17 is turned on. The first display element 18 lights up to inform the user that it is time to replace the garbage bag.

Next, the phase of the motor 11 is controlled by the phase control circuit 14, and when the rotation speed of the motor 11 becomes low, a potential difference is generated between both ends of the control element 12, and the voltage rectified by the diode 23tiI source resistor 24 is transferred to the Zener diode. 2
6. Stabilized by capacitor 26 and resistor 27.28
Otherwise, a bias is applied to the bake of transistor 29. Here, once the dust has accumulated in the garbage bag, even if the pressure in the air flow path does not reach the operating pressure of the first pressure switch 17, when it reaches the operating pressure of the second pressure switch 22, Since the second pressure switch 22 is turned on, the transistor 29 is also turned on, and the second display element 21 lights up to inform the user that it is time to replace the garbage bag.

As described above, according to the vacuum cleaner of the embodiment of the present invention, no matter what the rotational speed of the motor 11 is, when dust accumulates in the garbage bag, the first display element 18 or the second display element 21 is turned on. You can see at a glance when it's time to replace the garbage bag.

Next, another embodiment of the present invention will be described with reference to FIG. Components having the same configuration as those in the above embodiment are given the same reference numerals and explanations will be omitted.

As shown, the diode 15. The voltage rectified by the power supply resistor 16 is stabilized by a Zener diode 37 and a capacitor 38, and the first pressure switch 17 is connected between the Zener diode 37 and the anode of the diode 39. The cathode of the diode 39 in the housing is connected to the pressure of a comparator 42 provided in the lighting control circuit 41 through a resistor 4o. A display element 45 connected to a pull-up resistor 43 and a resistor 44 is connected to the pressure of the comparator 42. One terminal of the comparator 42 is connected to the connection point of the resistors 27 and 28. The pressure switch 22 is also connected to the second pressure switch 22 and the resistor 46.

47 is a reverse current prevention diode.

To explain the operation in the above configuration, first, the motor 1
1 is performing maximum rotation, no voltage is generated across the Zener diode 26 and the comparator 42 does not operate. At this point, if the garbage bag is full of dust, the first problem is
If the pressure switch 17 is set to turn on, current flows through the diode 39° resistor 40.44, and the display element 46 lights up. Next, the motor 11 is connected to the phase control circuit 1
When the rotation speed is low, a voltage is generated across the control element 12, and a constant voltage is generated across the Zener diode 26.

Here, when there is no dust accumulated in the garbage bag, the second pressure switch 22 is OFF, so the pressure of the comparator 42 becomes LOW, and the display element 46 does not light up.

Next, when the garbage bag is full of dust, the second pressure switch 22 is turned on, and the output of the comparator 42 becomes HIGH.
Tonashi, pre-up resistor 43. Current flows through the resistor 44,
The display element 46 lights up.

As described above, according to the vacuum cleaner of the embodiment of the present invention, it is possible to appropriately display the time to replace the garbage bag on the single display element 45 regardless of whether the rotation speed of the motor 11 is high or low. Become.

Effects of the Invention As is clear from the embodiments, the present invention includes a plurality of pressure switches disposed in the air suction flow path and having different set operating pressures, and at least one of the pressure cuff inches is connected to a power supply and a second pressure cuff. 1 display element, and the other pressure switch is connected to the lighting control circuit of the second display element, which is operated by the potential difference between both ends of the control element. The first display element or the second display element can notify the user of the appropriate time to replace the garbage bag, thereby improving usability. In addition, since the first display element and the second display element are made common, it is possible to notify when it is time to replace the garbage bag with a single display element.
It's very easy to see.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a vacuum cleaner according to an embodiment of the present invention, FIG. 2 is a perspective view of the same vacuum cleaner, and FIG. 3 is a circuit diagram of a vacuum cleaner according to another embodiment of the present invention. FIG. 4 is a circuit diagram of a conventional vacuum cleaner. 11...Motor, 12...Control element, 13
...Power source, 17...First pressure switch, 18...First display element, 20...-Lighting control circuit, 21...Second Display element, 22...
Second pressure switch. Name of agent: Patent attorney Akira Okaji and 2 others (Motor training)

Claims (2)

[Claims] (1) A motor that controls the rotation speed and suction force by connecting control elements such as bidirectional thyristors in series, and multiple pressure switches with different set operating pressures arranged in the air suction flow path. and at least one of the pressure switches
The pressure switch is connected between a power supply and the first display element, and the other pressure switch is connected to a lighting control circuit of the second display element operated by a difference between electrodes at both ends of the control element. (2) The vacuum cleaner according to claim 1, wherein the first display element and the second display element are common.