JPS6053622B2 - vacuum cleaner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an energy-saving control circuit for a vacuum cleaner used in general households.

BACKGROUND ART A conventional control circuit for a vacuum cleaner of this type has a structure as shown in FIG. 5, as disclosed in, for example, Japanese Patent Application Laid-open No. 114056/1983.

In short, the motor 1 and the bidirectional control rectifier 2 are connected in series to the power supply, the ignition element 3 is connected to the gate of the bidirectional control rectifier 2, and the negative characteristic heat-sensitive resistor 4 and the capacitor 5 are connected. The point where the other end of the ignition element 3 is connected to the connection point is also 0.

The negative resistance heat-sensitive resistor 4 is installed on the outer frame of the motor 1 or in the exhaust flow path. The operation of this circuit is that when sufficient air is flowing through the dust filter, the air volume is large, so motor 1
The exhaust temperature of the motor 1 is low, the resistance value of the negative characteristic heat-sensitive resistor 4 is large, the firing angle of the bidirectional control rectifier 2 is large, and the motor 1
The power consumption of is small. If the dust filter becomes clogged, the exhaust temperature of motor 1 will be high due to the low air volume.
The resistance value of the negative characteristic heat-sensitive resistor 4 is small, the firing angle of the bidirectional control rectifier 2 is small, the power consumption of the motor 1 is large, the suction force is increased, and the suction force is reduced due to filter clogging. It supplements the Further, as another example, as shown in Wani Publication No. 50-6444, the structure was as shown in FIGS. 6 and 7.

That is, a motor 6 (the name shown in the conventional example is used as is) and a bidirectional thyristor 7 are connected in series to a power supply, a bidirectional trigger diode 8 is connected to the gate of the bidirectional thyristor 7, and a resistor 9 is connected to the other end. and the connection point between the capacitor 10 and the capacitor 10.

The resistance value of the resistor 9 changes in conjunction with the piston 14, which changes depending on the vacuum pressure in the gap 13 between the blower 11 and the dust collection bag 12. The operation of this circuit is such that when sufficient air is flowing through the dust filter, the vacuum pressure in the gap 13 is low, the movement of the piston 14 is small, the resistance value of the resistor 9 is large, and the current in the bidirectional thyristor 7 is is small, and the input to the electric motor 6 can be kept small.

As more dust accumulates in the dust filter, the vacuum pressure in the gap 13 increases, and the movement of the piston 14 increases.
When the resistance value of the resistor 9 is small and the current of the bidirectional thyristor 7 becomes large, the input of the electric motor 6 becomes large, increasing the suction force, and the amount of dust in the dust collection filter decreases, causing the suction force to decrease. It supplements the Still another conventional example has a structure as shown in FIGS. 8 to 10, as shown in the specification and drawings of Japanese Patent Application No. 56-9359 filed by the same applicant as the present application.

That is, an electric blower 15 (the name shown in the conventional example is used as is) and a power control circuit 16 are connected in series, and the electric power of the electric blower 15 is controlled by an air volume sensor 17.

The operation of this circuit is that when the floor nozzle is separated from the surface to be cleaned and lifted into the air, the amount of air passing through the electric blower 15 increases, the output of the airflow sensor 17 increases, and is compared with the reference voltage 18. , the power control circuit 16 reduces the power of the electric blower 15.

When cleaning is performed by lowering the floor nozzle onto the surface to be cleaned, the air volume decreases, and the output of the air volume sensor 17 decreases and falls below the reference voltage 18, and the power control circuit 16 increases the power of the electric blower 15. Actual cleaning can be performed by increasing the suction power. This operation will be explained using the air volume vs. degree of vacuum characteristic curve in FIG. 10. When the floor nozzle is lifted into the air, the pressure loss is small, so a resistance curve like 19 is obtained.

When the floor nozzle is lowered onto the surface to be cleaned, pressure loss occurs between the surface to be cleaned and the floor nozzle, resulting in a resistance curve shown in 20. 2
1 is a characteristic curve when the electric blower 15 is operated at full power, and 22 is a characteristic curve when the power is reduced by the power control circuit 16.

The air volume at which the air volume sensor 7 exceeds the reference voltage 18 is set to 23 (reference air volume). When cleaning is carried out by lowering the floor nozzle onto the surface to be cleaned, the resistance curve of the floor nozzle becomes 20, and even if the air volume increases with the electric power of the electric blower 15, its operating point remains between the characteristic curve 21 and the resistance curve 20. The intersection point is 24,
This is because the air volume is smaller than the reference air volume 23, so the output of the air volume sensor 17 is small, and the power control circuit 16 is connected to the electric blower 1.
5, the operating point stabilizes at 24.

Next, when the floor nozzle is lifted into the air, the operating point of the floor nozzle moves to the right (toward the larger air volume) along the characteristic curve 21.
Resistance curve 19 and characteristic curve 21 when the floor nozzle is in the air
trying to go to intersection 25.

However, since the reference air volume 23 is in the middle, the sensor 1
7, the power control circuit 16 controls the electric blower 1.
5, the characteristic curve changes to 22. Therefore, the operating point is the intersection 26 of the characteristic curve 22 and the resistance curve 19. At the intersection point 26, the air volume is large according to the reference air volume 23, and the output of the air volume sensor 17 remains large and the operating point is stabilized at 26. Problems to be Solved by the Invention However, in the case of JP-A-50-114056, instead of directly measuring the air volume, the exhaust temperature of the motor is detected as a substitute characteristic for the air volume using a negative characteristic heat-sensitive resistor 4. Therefore, if a large amount of dirt is sucked into the filter in a short period of time, or if vinyl, etc. is sucked into the suction port and the vinyl is removed after the motor heats up, the suction performance will change rapidly. However, the problem was that the motor's heat changed only gradually, and the response speed could not keep up and control was delayed.

In addition, in the case of Utility Model Publication No. 50-64444, the vacuum pressure in the gap 13 is measured as a substitute characteristic for the air volume, and the amount of dust in the filter is detected. In this case, the vacuum pressure in the gap 13 increases somewhat → the input of the electric motor 6 becomes large → the suction force increases, and the suction force increases → the vacuum pressure in the gap 13 increases even more → the input of the electric motor 6 increases even more → the suction force increases, and so on. Because of this, even if it is just a little bit of garbage, it will quickly reach full power.

Conversely, when the vacuum pressure in the gap 13 drops due to some movement of dust due to the air flow inside the filter from the full power state, the control is activated to gradually reduce the suction force, and the power is reduced to the minimum power. In such a case,
The operation was very unstable. Furthermore, the patent application 1986-9
In the case of the specification and drawings of No. 3592, as shown in FIG.
For example, when cleaning a curtain or the like, the movement moves to the left along the characteristic curve 22 from the operating point 26 (the intersection of the characteristic curve 22 and the resistance curve 19) when it is in the air, and reaches the resistance curve 27. The operating point 2 is about to move to the intersection 28 with
8 (intersection point 28) has a smaller air volume than the standard air volume 23, so
The power control circuit 16 is activated and the characteristic curve changes to 21.

Therefore, the operating point is the intersection point 2 of the characteristic curve 21 and the resistance curve 27.
Move to 9. Since the air volume at the operating point 29 is larger than the reference air volume 23, the power control circuit 16 is activated, and the characteristic curve changes to 22.The above operation is repeated again, and the operating point goes back and forth between 28 and 29, becoming stable. The problem was that it didn't. Therefore, the present invention provides a power control circuit that has a fast response speed and stable operation.

Means for solving the problems and the technical means of the present invention for solving the above problems is to directly detect the air volume with an air volume sensor and to reduce the input from large to small, instead of using substitute characteristics. , the reference air volume increasing the input from small to large,
They are set separately to provide hysteresis.

action The effect of this technical means is as follows.

In other words, since the air volume is directly detected by the air volume sensor, there is no time lag or error, and the reference air volume for reducing the input from large to small is set to the larger air volume side than the reference air volume for increasing the input from small to large. Therefore, once the input changes from large to small, the reference air volume for increasing the input from small to large does not decrease even if the air volume is reduced slightly, so the input remains stable at small. Conversely, once the input changes from small to large,
Even if the air volume is slightly increased, the input will not increase to the standard air volume that reduces the input from large to small, so the input will remain large and stable. As a result, stable control characteristics with smooth response can be obtained.

EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings.

In Fig. 1, 31 is the main body case of the vacuum cleaner, 32
is a filter, and an electric blower 33 is provided behind it.

34 is a hose, and 35 is a connecting vibe that connects the case 31 and the hose 34.

The air and dust sucked from the hose 3-4 are filtered through the filter 32.
The dust is separated and air is discharged from the exhaust port 36. 3
Reference numeral 7 denotes an air volume sensor provided in the air flow path, and in this embodiment, it is provided in front of the electric blower 33 and further behind the filter 32.

FIG. 2 shows an example of the electrical configuration of the vacuum cleaner of this embodiment, in which an input power control circuit 38 is connected in series with the electric blower 33.
is connected, and the output of a comparator 39 is connected to the input of the power control circuit 38. An air flow sensor 37 is connected to one input of the comparator 39 via a resistor 40, and also to one input of the comparator 39.
A reference voltage 41 is connected to each input. Furthermore, a resistor 42 is connected between the output of the comparator 39 and the four inputs. When the output of the comparator 39 is the same, the human power control circuit 38 reduces the input power. In the above configuration, when the floor nozzle is on the floor, the air volume is also lower than the set value, and the comparator 3
There is no output of 9.

At this time, the four input voltages of the comparator 39 are the output of the airflow sensor 37;
If it is l2, ■.

N4?廿: becomes. Next, when the floor nozzle is removed from the floor and the air volume increases, the output of the air volume sensor 37 increases and the comparator 39 reverses and outputs an output. ,, Let the value of the reference voltage 41 be Vll.

And the input is reduced. Next, when the floor nozzle is placed on the floor and the air volume decreases, the comparator 39 reverses again and there is no output.If the output voltage of the air volume sensor 37 at this time is 2, and the output of the comparator 39 is 9, then 2 :Vll(■10×12)-V9KlO9-.

In other words, when comparing VLl and VL2, is VL2 better?
If it is lower by 7.

This shows that when the air volume is lower by the output power of the air volume sensor 37, the output of the comparator 39 becomes 0 and the input increases. This is shown in Fig. 3 in terms of air volume versus vacuum degree characteristics. 43 is the characteristic of the electric blower, 44 is the one when the input is reduced, 45 is the resistance curve when the floor nozzle is placed on the floor, 46 is the resistance curve when the floor nozzle is raised from the floor, and 47 is the one when the input is reduced. This is the operating point when

Here, 48 is a set air volume for reducing the input, which corresponds to V in the output of the air volume sensor. 49 indicates the set air volume when increasing the input, and the output of the air volume sensor is VL2.
corresponds to

In this way, by shifting the settings for the air volume that reduces the input and the air volume that increases the input, the air volume that increases the input (Q2
) 49 can be made lower than the air volume at the operating point 47 when the input is reduced, so an unstable state does not occur. Further, since there is no need to set the air volume setting (Q1) 48 for reducing the input to 47 or less, the setting range can be widened and adjustment can be made easily. To explain in more detail, in FIG. 3, when a floor nozzle is used on a resistance curve 50 between the floor and the air, for example for cleaning curtain fur, etc., the resistance curve 50 falls along the characteristic curve 44 from the operating point 47 when used in the air. Moving to the left, the operating point is the resistance curve 50 and the characteristic curve. Moving to the intersection 51 of the line 44.

Since the operating point 51 does not fall below the set air volume (Q2) of 49, the input does not increase and becomes stable at the operating point 51. If the resistance curve 45 was used before moving to the resistance curve 50, the operating point 52 is moved to the right along the characteristic curve 43 and the operating point 53 is located at the intersection of the resistance curve 53 and the characteristic curve 43. Move to. This operating point 53 also does not exceed the set air volume (Q1) of 48, so the input does not decrease and becomes stable at the operating point 53. (Normally, when cleaning sofa curtains, etc., the floor nozzle floats in the air once, so it becomes stable at 51.) In this way, even when the load is an intermediate resistance curve, it is unstable as before. It can be used stably without causing problems. Further, as shown in FIG. 4, a switching plate 56 is connected to a switch (not shown) with a gap provided between a shaft 55 linked to the wind receiving plate 54 and a receiving portion 57 of the switching plate 56 of this shaft 56. The switching plate 5
A similar effect can be obtained by providing hysteresis in the movement of 5.

Furthermore, a switch connected to the wind receiving plate is used as an airflow sensor, and a reversing spring is used for this switch to turn ON<50F.
It goes without saying that a similar effect can be obtained by providing hysteresis at the position of F. In addition, since the sensor is an airflow sensor that directly measures the airflow, the response speed is fast and there are fewer malfunctions. Effects of the Invention As described above, according to the present invention, in an energy-saving vacuum cleaner that controls the input power control circuit of an electric blower using the output of the airflow sensor provided in the air flow path, the input power control circuit operates to control the input power. Set amount Q of air volume to reduce
1. By setting the air volume setting value Q2, which detects a decrease in air volume and increases the input, so that Q1>Q2, a vacuum cleaner that is stable, easy to adjust, and easy to mass produce can be obtained. I can do it.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of a vacuum cleaner showing an embodiment of the present invention, Fig. 2 is an electrical wiring diagram thereof, Fig. 3 is an air volume vs. vacuum degree characteristic diagram in the present invention, and Fig. 4 is an air volume sensor and other diagrams. FIG. 5 is an electrical wiring diagram of a conventional vacuum cleaner, FIG. 6 is an electrical wiring diagram of another conventional vacuum cleaner, and FIG.
Figure 8 is a schematic configuration diagram of the same vacuum cleaner, Figure 8 is a schematic diagram of another conventional vacuum cleaner, Figure 9 is the electrical connection diagram, and Figure 10 is the air volume vs. degree of vacuum characteristic. It is a diagram. 33... Electric blower, 37... Air volume sensor, 38... Input power control circuit, 39...
・Comparator, 40, 42... Resistor, 54...
... Wind receiving plate, 55 ... Shaft, 56 ... Switching plate.

Claims (1)

[Claims] 1. In a vacuum cleaner that controls the input power of an electric blower using the output of an air volume sensor provided in an air flow path, a set value (Q1) of the air volume at which the input power is reduced by the air volume sensor.
and the air volume setting value (Q2) that increases the input power.
A vacuum cleaner set so that 1>Q2. 2 Connect the output of the air volume sensor to the input of the comparator via a resistor, connect a resistor between the output terminal of the comparator and the input terminal, and control the input control circuit of the electric blower with the output of the comparator. Claim 1 characterized in that
Vacuum cleaner as described in section. 3. The vacuum cleaner according to claim 1, wherein a switch having different ON and OFF positions is used as the air volume sensor. 4. As an airflow sensor, a shaft connected to a wind receiving plate and a switch changeover plate with a gap provided between the receiving part of this shaft are used,
The vacuum cleaner according to claim 1, wherein hysteresis is set on the switch changeover plate with respect to the movement of the wind receiving plate.