JP2537209B2 - Electric vacuum cleaner and method for controlling electric vacuum cleaner - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vacuum cleaner, and more specifically, it detects the suction force inside the vacuum cleaner and detects the input of the electric blower based on the detection signal. The present invention relates to an improved vacuum cleaner to be controlled and a method of controlling the vacuum cleaner.

[Conventional technology]

Prior to the description of the present invention, a control system of various conventionally proposed electric vacuum cleaners will be described with reference to FIGS. 7 to 10.

In FIG. 7, 1 is an electric blower, 2 is a bidirectional semiconductor element, 3 is a trigger element connected to the gate of the bidirectional semiconductor element 2, 4 is a variable resistor, 5 is a capacitor, and is shown in FIG. In the vacuum cleaner, the user manually adjusts the variable resistor 4 to change the firing angle of the bidirectional semiconductor element 2 to change the input of the electric blower 1. According to the electric vacuum cleaner shown in FIG. 7, the input of the electric blower can be controlled by the user's judgment according to the place to be cleaned.

Further, in the electric vacuum cleaner shown in FIG. 8, a negative characteristic heat sensitive resistor 4'is connected in place of the variable resistor 4 shown in FIG. 7, and the negative characteristic heat sensitive resistor 4'is connected. In the electric vacuum cleaner shown in FIG. 8, when the air volume of the electric blower 1 is large, the exhaust temperature is low and the resistance value of the negative characteristic thermal resistance 4'is growing. Therefore, at this time, the firing angle of the bidirectional semiconductor element 2 is large, and the input of the electric blower 1 is small. On the other hand, the filter is clogged and the electric blower 1
When the amount of the air is reduced, the exhaust temperature is increased and the resistance value of the negative characteristic heat sensitive resistor 4'is reduced. Therefore, at this time, the firing angle of the bidirectional semiconductor element 2 is small and the input of the electric blower 1 is large. That is, the decrease in suction force due to clogging of the filter is compensated.

Next, in the electric vacuum cleaner shown at 10 o'clock, the variable resistance 4 is made to interlock with the piston 6 that operates in response to the negative pressure inside the vacuum cleaner body case 9 to change its resistance value. According to the vacuum cleaner shown in FIG. 10,
As the clogging of the filter 7 progresses, the piston 6 moves in the direction of the arrow in the figure, the resistance value of the variable resistor 4 decreases, and the firing angle of the bidirectional semiconductor element 2 decreases.
The input of the electric blower 1 becomes large. Therefore, like the vacuum cleaner shown in FIG. 8, it is possible to compensate for the decrease in suction force due to filter clogging.

Furthermore, in the electric vacuum cleaner shown in FIG. 9, the air volume sensor 15 'detects the air volume inside the vacuum cleaner, and the comparator compares it with the reference voltage.
According to the electric vacuum cleaner shown in the figure, if the air volume inside the vacuum cleaner is equal to or larger than the set value, the output of the air volume sensor 15 'is large and exceeds the reference voltage. Therefore, the output of the amplifier 23 is increased to increase the power control circuit. 8 reduces the input of the electric blower 1. If the air volume inside the vacuum cleaner is below the set value, the output of the air volume sensor 15 'is small and falls below the reference voltage, so the output of the amplifier 23 is made small and the power control circuit 8 increases the input of the electric blower 1. . Therefore, when the suction port of the vacuum cleaner is lifted in the air, since the air volume inside the vacuum cleaner is large, the electric blower 1
The input of the electric blower 1 can be increased because the air volume inside the cleaner is small when the cleaner suction port is placed on the floor. That is, according to the electric vacuum cleaner shown in FIG. 9, the electric blower 1 can be set to full power only when dust is sucked from the floor surface.

Prior art relating to the electric vacuum cleaner includes, for example, Japanese Utility Model Laid-Open No. 50-64449, Japanese Patent Laid-Open No. 50-114056, and Japanese Utility Model Publication 57-19077.
And JP-A-57-209027.

[Problems to be solved by the invention]

However, in the vacuum cleaner shown in FIG. 7,
Since the input control of the electric blower 1 is left to the judgment of the user, it is not always possible to perform accurate input control, and it is necessary to manually adjust the input each time, which is bothersome. Accompany.

Further, in the vacuum cleaner shown in FIG. 8, it takes some time to heat and cool the negative characteristic thermal resistance 4 ',
If a large amount of dust is sucked in in a short time, or if the filter is clogged suddenly, there is a drawback that the response to them is slow.In such a case, the required suction force cannot be obtained, or the electric There is a problem that the blower 1 consumes extra power.

Next, in the electric vacuum cleaner shown in FIG. 10, when the filter 7 is slightly clogged, the negative pressure inside the vacuum cleaner increases, and accordingly, the input of the electric blower 1 increases → the suction force increases →
There is a problem that the electric blower 1 performs full power operation even after a little dust by repeating the process of increasing the negative pressure and further increasing the input of the electric blower 1 → increasing the suction force → increasing the negative pressure. On the contrary, when the electric blower 1 performs full-power operation, dust is removed by the air flow in the filter 7, and the negative pressure in the cleaner drops, the suction force of the cleaner decreases. There is also a problem that the operation of the vacuum cleaner becomes unstable due to clogging of the filter 7 such that the power control circuit operates and the power of the electric blower 1 becomes the minimum power.

Further, in the electric vacuum cleaner shown in FIG. 9, when cleaning the curtain, for example, when the vacuum cleaner suction port sticks to the curtain and the negative pressure inside the vacuum cleaner increases, and the value exceeds the reference value, There is a problem that the input of the electric blower 1 is increased and the suction force is increased, the suction port of the vacuum cleaner strongly sticks to the curtain, and it becomes difficult to operate the vacuum cleaner.

In Japanese Patent Publication No. Sho 60-53622, two airflow rates (Q ₁ , Q ₂ ) are set to control the input of the electric blower, and when the airflow rate Q is large (Q> Q ₁ ), the input is reduced. , An electric vacuum cleaner that increases the input when the air volume Q is small (Q <Q ₂ ) and controls the input of the electric blower in this way,
In the vacuum cleaner disclosed in the same publication, the air volume at the maximum suction power is not recognized, and it is said that Q ₁ <Q _P with respect to the air volume Q _P at the maximum suction power. , would be to reduce the input of the maximum suction work rate, not obtained the necessary suction force, also when there is in Q _2> Q _P to the air flow rate Q _P at the time of maximum suction work rate, the maximum suction work rate However, there is a problem in that more input is consumed and wasted energy is wasted.

The present invention, in order to solve the problems of the prior art described above,
It has been made as a result of various investigations, and its purpose is to provide an improved vacuum cleaner and vacuum cleaner that have excellent responsiveness and stability of operation and can greatly contribute to energy saving. It is intended to provide a control method of.

[Means for solving problems]

In order to achieve the above-mentioned object, a feature of the present invention is to detect a main body case, an electric blower built in the main body case, a filter located on a suction side of the electric blower, and a suction force inside the cleaner. An electric vacuum cleaner having a vacuum cleaner suction force detection circuit and a power control circuit that controls an input of an electric blower based on a signal from the suction force detection circuit, and has a suction force almost corresponding to a suction power maximum. As a boundary, set values that are the first reference suction force and the second reference suction force are provided on the side where the suction force is large and the side where the suction force is small, and the detection value detected by the suction force detection circuit is set. Is greater than the first reference suction force and is less than the second reference suction force, the input of the electric blower is controlled to be reduced.

Further, a feature of the present invention is that the main body case,
The electric blower built into the main body case, the filter located on the suction side of the electric blower, the vacuum cleaner suction force detection circuit that detects the suction force inside the vacuum cleaner, and the electric power based on the signal from the suction force detection circuit An electric vacuum cleaner having a power control circuit for controlling the input of a blower, wherein a suction force corresponding to a maximum suction power is used as a boundary, and a suction force is increased on a side having a large suction force and a suction force on a side having a small suction force. 1 standard suction force,
When the second reference suction force is set and the detection value detected by the suction force detection circuit becomes larger than the first reference suction force and when it becomes smaller than the second reference suction force, The control is to reduce the input of the electric blower.

[Action]

According to the present invention, the first reference suction force and the second reference suction force are respectively set on the side having a large suction force and the side having a small suction force with the suction force substantially corresponding to the maximum suction power as a boundary. When the set value is detected by the suction force detection circuit and becomes larger than the first reference suction force, and when the second reference suction force becomes smaller, the input of the electric blower is reduced. Therefore, when the vacuum cleaner suction port is lifted in the air, for example, it is possible to suppress excessive energy consumption, and there is a problem that the vacuum cleaner suction port strongly sticks to the curtain or the floor surface. It can be solved, and the operability of the vacuum cleaner can be improved.

〔Example〕

Hereinafter, the present invention will be described based on an embodiment of FIGS. 1 to 4.

FIG. 1 is a partially longitudinal side view showing the entire structure of the vacuum cleaner of the present invention, FIG. 2 is a block circuit diagram showing the operation system of the vacuum cleaner of the present invention, and FIG. 13
An electric circuit diagram showing details of the trigger circuit and the feedback circuit shown in (and 14), and FIG. 4 is an air volume-vacuum degree characteristic diagram of the vacuum cleaner of the present invention.

In FIG. 1, the electric blower 1 is located on the rear surface of the filter 7 and is fixed to the main body case 9. One end of a hose 50 is attached to the suction port 9a of the body case 9, one end of an extension pipe 49 is connected to the other end of the hose 50, and the suction port 48 is attached to the other end of the extension pipe 49. The pressure sensor 16 is provided in the air passage of the suction port 48. An air volume sensor 15 is provided between the suction side of the electric blower 1 and the filter 7.

With the above configuration, when the electric vacuum cleaner is operated with the switch turned on, the dust sucked through the suction port 48 passes through the extension tube 49 and the hose 50, enters the main body case 9 through the suction port 9a, and is filtered by the filter 7. Only filtered and clean air passes through the electric blower 1 and is discharged from the exhaust port 9b. Then
Since the pressure sensor 16 is provided in the ventilation passage of the suction port 48, when the suction port 48 sticks to the curtain, for example, and the air volume Q inside the cleaner becomes Q <Q ₂ (FIG. 4), the pressure sensor 16 is pressed. The sensor 16 detects and reduces the input of the electric blower 1,
The pressure H in the vacuum cleaner is controlled so that H ≦ H ₁ . That is, the air volume is detected by the pressure and the pressure is controlled. As a result, the suction between the suction port 48 and the curtain is weakened, and the curtain can be easily separated from the suction port 48. In addition, when the suction port 48 is placed on the floor surface and the suction port 48 strongly sticks to the floor surface, Q <Q ₂ is satisfied as in the above case. The input of the blower 1 is reduced, and the pressure H of the cleaner is reduced so that H ≦ H _{1 in} FIG. As a result, the suction between the suction port 48 and the floor surface is appropriately adjusted, and the suction port 48 can be easily operated.

In the present embodiment, the air volume inside the vacuum cleaner is detected based on the detection value of the pressure sensor 16. The relationship between the air volume Q inside the vacuum cleaner and the pressure H is as shown in FIG. Since there is a correlation, the air volume corresponding to this pressure can be detected from the detected pressure.

The installation location of the pressure sensor 16 is not limited to the ventilation passage of the suction port 48 as shown in FIG.
If it is provided in the ventilation path from the hose 50 to the hose 50, the air flow rate Q-pressure H characteristic shown in FIG. 4 can be directly detected, and the matching between the pressure sensor 16 and the power control circuit can be performed well. .

By the way, in the present invention, the minimum set value Q ₂ of the electric blower input control air volume has a relationship of Q ₂ <Q _{P with} respect to the air volume Q _P at the time of maximum suction work rate, as described above. By setting the air flow rate value Q ₂ as the air flow rate at the lower limit point of the suction force in advance, it is possible to reduce the input as much as possible below the limit of the suction force, avoid unnecessary power consumption, and overload the electric blower 1. Can be prevented.

Further, in the present invention having the above configuration, when the filter 7 is clogged and the air volume in the cleaner becomes Q <Q ₂ , the pressure sensor 16 detects this and increases the input of the electric blower 1. By controlling the pressure H in the cleaner to be H ≧ H _{2 in} FIG. 4, the suction force can be increased and the cleaner can be continuously operated for a longer period of time than before.

Further, in the present invention having the above-mentioned configuration, the air flow sensor 15 is provided on the suction side of the electric blower 1, and the air flow Q in FIG. The air flow rate Q is constant, and therefore the air flow rate Q is also determined by the air flow rate sensor 15 provided on the suction side of the electric blower 1.
Can be directly detected, and there is no problem in matching between the air volume sensor 15 and the power control circuit. In addition to this, when the mounting position of the air volume sensor 15 is on the rear surface of the filter 7, the air volume sensor 15 is It is possible to effectively prevent deterioration and malfunction. Thus, in the vacuum cleaner, since necessary and the suction work rate maximum time indicated by the symbol Q _P in Figure 4 sufficient suction force is adapted to obtain, suction force extra in more airflow Therefore, it means that excessive energy is consumed, but if the maximum air volume value Q ₁ of the air volume sensor 15 is set in advance, even when the vacuum cleaner suction port 48 is lifted in the air, However, it does not consume excessive energy, and the noise generated at the suction port 48 is small.

Next, the overall operation system of the vacuum cleaner of the present invention will be described with reference to FIG.

In Figure 2, the power supply voltage V is applied to the power control circuit 8 comprising more trigger circuit 10 which controls the point arc angle and bidirectional semiconductor element 2, the terminal voltage V _M of the electric blower 1 is output. According to this V _M , the fan G _M of the electric blower 1 rotates at the rotation speed N, and the aerodynamic performance G _{P of the} vacuum cleaner determines the suction force P. This P, the air flow sensor 15 and pressure sensor 16 detects the air volume of Q _1, Q _2, the converter K _Q1, K _Q2, is converted into each of the voltage V _Q1, V _Q2, amplifiers K _1, K ₂ , amplified by V ₁ and V ₂ .

Outputs V ₁ and V ₂ from the air volume detection circuit 11 and the pressure detection circuit 12 are feedback circuits 1 that perform respective signal processing.
Enter 3 and 14, and set air flow Q through each adjustment circuit K ₃ and K _4.
1 is compared with the reference voltages V _S1 and V _S2 determined by Q ₂ , and if Q> Q ₁ or Q <Q ₂ is satisfied, the trigger circuit 10
Output a voltage of V ₃ or V ₄ , increase the firing angle,
The input of the electric blower 1 is reduced.

By the above operation, if Q> Q ₁ , the input of the electric blower 1 is reduced so that the detection value of the air volume sensor satisfies Q ≦ Q ₁ , and if Q <Q ₂ , the electric blower 1 is controlled. The input is reduced to control the detection value of the pressure sensor to be H≤H ₁ or H≥H ₂ . That is, it is controlled so as to move in the direction of the arrow in FIG. With air flow sensor to detect Q ₁ is in this embodiment, so that use of the air flow sensor to detect the Q _2, the pressure and air volume in vacuum cleaners are both correlated, if necessary The pressure sensor and the air flow sensor may be selected. Further, in this embodiment, two sensors, a pressure sensor and an air flow sensor, are used, but it goes without saying that control can be performed using either one of the pressure sensor and the air flow sensor.

Also, in FIG. 2, reference numerals 10 and 13 (and 1 respectively)
In Fig. 3 showing the details of the trigger circuit and feedback circuit shown in 4), the air volume inside the vacuum cleaner is
Converted to voltage through the air flow sensor 15 connected to _CC ,
The input value is determined through the resistor 17. If Q> Q ₁ with respect to the reference voltage determined by the resistor 19, the output of the amplifier 23 is
Amplified by the gain determined by resistors 21 and 19, +
Is output to the amplifier 31 in the subsequent stage through the diode 27 and the resistor 29. If Q ≦ Q ₁ , the output becomes −, a current flows through the diode 25, and the current is not output to the amplifier 31 in the subsequent stage. Similarly, the pressure sensor 16 is also input through the resistor 18, and when Q <Q ₂ with respect to the reference voltage determined by the resistor 20, the pressure sensor 16 is amplified by the amplification degree determined by the resistors 20 and 22, and the diode 28 is output as a + output. Then, it is sent to the subsequent amplifier 31 through the resistor 29. If Q ≧ Q ₂ , the output becomes −, a current flows through the diode 26, and the amplifier 31 at the subsequent stage
Is not output to In the latter stage amplifier 31, the resistance 30 and
It is amplified by the amplification degree determined by 32, the electric potential V _{S at the} S point is determined by the power control automatic / manual switch 33, and the trigger element 3 is divided by the resistors 34, 35 having resistance values R ₁ , R ₂ respectively. The voltage of the anode A of the triggered trigger element 3 And Power transformer 36, rectifier 37, current limiting resistor 38,
The AC power supply 40 is converted to a low voltage DC by the constant voltage diode 39, and the capacitor 5 is passed through the main body switch 41 and the variable resistor 4.
Assuming that the gate voltage charged to V _G is V _G = V _G , the bidirectional semiconductor element 2 is passed through the pulse transformer 42 when V _A = V _G.
A trigger signal is sent to the gate of and the input of the electric blower 1 is controlled. Therefore, the input changes as the potential at the point S changes. The outputs of the feedback circuits 13 and 14 are set to appropriate values, and as shown in FIG. 4, Q> Q ₁
The input is reduced by, and control such that H ≦ H ₁ or H ≧ H ₂ is possible with Q <Q ₂ . Also, change the switch 33 to the main unit switch 41.
If it is connected to the side, the potential at point S will be determined, and if the resistance value R _X of the variable resistor 4 is changed, the time constant determined by the capacitance C of the capacitor 5 will change and the time when V _A = V _G will change. Alternatively, the input of the electric blower 1 can be manually adjusted.

The present invention is as described above, and the operation system of the vacuum cleaner of the present invention will be summarized below.

That is, in the present invention, as described above, the set value of the air volume for performing the input control of the electric blower 1 is two points of Q ₁ > Q _P > Q ₂ with respect to the air volume Q _P at the time of maximum suction work rate, When the air volume Q of the vacuum cleaner is Q> Q ₁ , the input of the electric blower 1 is reduced, so that, for example, when the vacuum cleaner suction port 48 is lifted in the air, excessive energy is not consumed. Also, the noise generated at the vacuum cleaner suction port 48 can be reduced.

Further, in the present invention, even when the suction port 48 of the vacuum cleaner is in close contact with the object and the cleaner air volume Q is Q <Q ₂ , the input of the electric blower 1 is controlled so as to be reduced. It is possible to solve the problem that the suction port 48 of the vacuum cleaner strongly sticks to the curtain or the floor surface, for example, and to improve the operability of the vacuum cleaner and to prevent the electric blower 1 from being overloaded.

Further, in the present invention, when the filter 7 is clogged and the air volume Q of the vacuum cleaner becomes Q <Q ₂ , the electric blower 1
By controlling so as to increase the input of, the suction force can be increased and the operation of the vacuum cleaner can be continued for a longer time than before.

FIG. 5 is a trigger circuit which is another embodiment of the vacuum cleaner of the present invention.
An electric circuit diagram showing the details of 10 and the feedback circuit 13 (and 14), and FIG. 6 is a flowchart of the circuit operation shown in FIG.

That is, in the embodiment shown in FIG. 5, a program according to the flowchart as shown in FIG. 6 is assembled on the microcomputer 43, and the air flow sensor 15 and the pressure sensor 16 are installed.
The analog signal of is digitized by A / D converters 44 and 45,
The output according to the flowchart of FIG.
The signal is converted to an analog signal by 6,47 and the signal is amplified by the amplifier 31 to determine the potential at the point S. It should be noted that in both FIG. 3 and FIG. 5, Q ≦ Q _S , H ≦ H _S (initial setting: sixth
In the case of (), there is no amplified output, point S has a constant minimum potential, and the input of the electric blower 1 does not change.

〔The invention's effect〕

As described above, according to the present invention, the first reference suction force, the first reference suction force, and the first reference suction force are respectively set on the side having a large suction force and the side having a small suction force with the suction force substantially corresponding to the maximum suction power as a boundary. When the reference suction force of 2 is set and the detection value detected by the suction force detection circuit becomes larger than the first reference suction force and becomes smaller than the second reference suction force, Since the input of the electric blower is reduced, excessive energy consumption can be suppressed, for example, when the vacuum cleaner suction port is lifted in the air. You can solve problems such as sticking strongly,
The operability of the vacuum cleaner can be improved.

[Brief description of drawings]

1, FIG. 2, FIG. 3, and FIG. 4 show an embodiment of the present invention. FIG. 1 is a partially longitudinal side view showing the entire structure of the vacuum cleaner of the present invention, and FIG. FIG. 3 is a block circuit diagram showing the operation system of the inventive vacuum cleaner, FIG. 3 is FIG.
FIG. 4 is an electric circuit diagram showing details of the trigger circuit and the feedback circuit shown in (and 14), FIG. 4 is an air volume-vacuum degree characteristic diagram of the cleaner of the present invention, and FIG. 5 is another embodiment of the cleaner of the present invention. 6 is an electric circuit diagram showing details of the trigger circuit 10 and the feedback circuit 13 (and 14), FIG. 6 is a flow chart of the circuit operation shown in FIG. 5, and FIGS. Electric circuit diagram of the proposed vacuum cleaner,
FIG. 10 is a vertical cross-sectional side view showing a schematic configuration of a conventional electric vacuum cleaner different from FIGS. 7, 8 and 9. 1 ... Electric blower, 7 ... Filter, 9 ... Main body case, 9a ... Main body case suction port, 15 ... Air volume sensor, 16 ...
… Pressure sensor, 48… Suction port, 49… Extension tube, 50… Hose.

Claims (2)

(57) [Claims] 1. A main body case, an electric blower built into the main body case, a filter located on the suction side of the electric blower, a cleaner suction force detection circuit for detecting the suction force inside the cleaner, and the suction force. An electric vacuum cleaner having a power control circuit for controlling the input of an electric blower based on a signal from a detection circuit, wherein a suction force almost corresponding to a maximum suction power is a boundary,
First on each side of high suction force and low suction force
Set the set value that becomes the reference suction force and the second reference suction force of
When the detection value detected by the suction force detection circuit becomes larger than the first reference suction force, and
The electric vacuum cleaner is controlled so as to reduce the input of the electric blower when it becomes smaller than the reference suction force of. 2. A main body case, an electric blower built in the main body case, a filter located on the suction side of the electric blower, a cleaner suction force detection circuit for detecting the suction force inside the cleaner, and the suction force. An electric vacuum cleaner having a power control circuit for controlling the input of an electric blower based on a signal from a detection circuit, wherein a suction force almost corresponding to a maximum suction power is a boundary,
First on each side of high suction force and low suction force
The reference suction force and the second reference suction force are set, and when the detection value detected by the suction force detection circuit becomes larger than the first reference suction force, and smaller than the second reference suction force. When it becomes, the control method of the electric vacuum cleaner is characterized by controlling so as to reduce the input of the electric blower.