JPH114788A - Vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum cleaner realizing stable absorbing force in a practical area by more accurately and precisely detecting the quantity of dust collected in a dust bag and controlling an electric blower according to the detected dust quantity. SOLUTION: At the vacuum cleaner provided with the electric blower 16 being a dust collecting source and the dust bag 7 provided between the blower 16 and an absorbing port 4 and collecting dust included in an air flow absorbed from the port 4 by the driving of the blower 16, a controller 17 controls the number of the revolution of the blower 16 according to the number of the revolution of the blower 16 and a pressure difference between the pressure of a ventilator inside of the bag 7 detected by a pressure sensor 14 and the pressure of a ventilator between the bag 7 and the blower 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cleaner, and more particularly, to the detection of the amount of dust collected in a dust bag and the control of an electric blower as a dust collection source.

[0002]

2. Description of the Related Art FIG. 9 shows a schematic diagram of a conventional vacuum cleaner. In the figure, 1 is a vacuum cleaner main body, 2 is a suction hose, 3 is an extension pipe, 4 is a suction port, 5 is a dust collection chamber, 6
Is a dust collection chamber cover, 7 is a garbage bag, 8 is a suction hose connection pipe, 9 is an exhaust port, 16 is an electric blower, 17 is a control device, 18 is an operation unit, and 19 is a display unit.

When an operation switch provided on an operation section 18 is turned on, an electric blower 16 is driven by a control device 17 to extend the suction pipe 4, the extension pipe 3, the suction hose 2, and the suction hose connecting pipe 8 from the suction port 4. , An airflow is generated into the trash bag 7 stored in the dust collection chamber 6.
The airflow is discharged from the exhaust port 9 after dusts and the like contained therein are collected by the garbage bag 7.

As described above, the refuse gradually accumulates in the garbage bag 7, and as the amount of refuse collected in the garbage bag 7 increases, the resistance in the airflow path increases, and The airflow from 4 into the garbage bag 7 is weakened,
If no treatment is given as it is, the suction force will decrease rapidly, and the desired cleaning ability will not be obtained.

In order to solve such a problem, Japanese Patent Publication No. 2-30683 discloses a garbage bag 7 and an electric blower 16.
A pressure sensor for measuring a negative pressure (hereinafter, referred to as “pressure outside the trash bag 7”) of the ventilation path between the electric blower 16 and the electric blower 16.
Means for detecting the applied voltage or the inflow current to the motor, and controlling the applied voltage to the motor according to the pressure outside the trash bag 7 and the applied voltage or the inflow current to the motor. Is disclosed.

[0006]

Here, the suction force of the vacuum cleaner increases in proportion to the rotation speed of the electric blower and decreases in proportion to the amount of dust. Therefore, in order to stably maintain a sufficient suction force, the rotation speed of the electric blower must be controlled according to the amount of dust. That is, unless the amount of dust is accurately detected, a sufficient suction force cannot be stably maintained.

On the other hand, in the input device of the vacuum cleaner, since the driving voltage of the motor is controlled in accordance with the pressure outside the trash bag 7, there are the following problems.
Since the pressure outside the dust bag 7 increases in proportion to the amount of dust collected, there is certainly a close relationship between the amount of dust and the pressure outside the dust bag. However, the change in the pressure outside the dust bag 7 with respect to the change in the amount of dust is very small, and even if the amount of dust is the same, the pressure outside the dust bag 7 depends on the grounding state of the suction port 4 on the floor surface. Changes greatly.

Accordingly, it is difficult to stabilize the suction force accurately with respect to a change in the amount of dust, and in a practical region where the state of contact of the suction port 4 with the floor surface is not constant, the electric blower 16 The rotation speed becomes very unstable, and a stable suction force cannot be realized.

In addition, since the drive voltage of the motor is controlled, the rotation speed of the electric blower 16 is equivalent to the drive voltage of the motor, but the vacuum cleaner is not used due to variations in motor characteristics. There is also a possibility that individual differences may occur in the suction force of the ink.

[0010] In summary, the conventional vacuum cleaner cannot accurately and accurately detect the amount of collected dust, and thus does not realize a stable suction force.

Therefore, the present invention detects the amount of collected dust more accurately and accurately and controls the electric blower in accordance with the detected amount of dust.
An object of the present invention is to provide a vacuum cleaner that realizes a stable suction force in a practical range.

[0012]

In order to achieve the above object, in the electric vacuum cleaner according to the first aspect, an electric blower serving as a dust collecting source is provided between the electric blower and a suction port,
In a vacuum cleaner having a garbage bag that collects dust contained in the airflow sucked from the suction port by driving the electric blower, a rotation speed detecting unit that detects a rotation speed of the electric blower, A pressure sensor for inputting the pressure of the ventilation path inside the garbage bag and the pressure of the ventilation path between the garbage bag and the electric blower, and detecting a pressure difference between these two pressures; A dust amount detecting means for detecting an amount of dust collected in the dust bag based on a rotation speed to be detected and a pressure difference detected by the pressure sensor.

Here, first, the pressure in the ventilation path inside the garbage bag (hereinafter referred to as the "pressure inside the garbage bag") decreases in proportion to the amount of dust collected in the garbage bag. The pressure difference between the pressure inside the bag and the pressure outside the trash bag (hereinafter simply referred to as “pressure difference”) is closely related to the amount of trash.
In addition, since the pressure inside the garbage bag and the pressure outside the garbage bag change oppositely to a change in the amount of garbage, the pressure difference reacts more sensitively than the pressure outside the garbage bag alone. Also,
The pressure outside the garbage bag changes according to the state of the suction port being grounded to the floor, but the pressure inside the garbage bag also changes in the same way, so that both pressure changes are canceled out. Then, even if the pressure difference is the same, the amount of dust actually collected differs depending on the number of rotations of the electric blower (hereinafter, simply referred to as “number of rotations”).

In view of the above, according to the configuration of the first aspect, since there is a dust amount detecting means for detecting the amount of dust based on the pressure difference and the number of rotations, the amount of dust can be reduced. More accurate and accurate detection is possible.

[0015] In the vacuum cleaner according to the second aspect,
2. The vacuum cleaner according to claim 1, wherein the airflow sucked from the suction port is parallel to and adjacent to a suction hose connection pipe that guides the airflow into the garbage bag, and one end of the pipe is connected to a ventilation path inside the garbage bag. A first pressure guiding tube provided so as to communicate with the pressure sensor, and the other end of the first pressure guiding tube is connected to the pressure sensor, whereby the pressure of the ventilation path inside the garbage bag is input to the pressure sensor. .

According to the above configuration, the pressure inside the garbage bag can be input to the pressure sensor with a simple structure, and the pressure inside the garbage bag at the portion where the first pressure guiding tube is provided can change the amount of dust. Since it changes most sensitively, the amount of dust can be detected more accurately.

Further, in the electric vacuum cleaner according to the third aspect,
The vacuum cleaner according to claim 2, wherein the garbage bag comprises:
A backing sheet provided with a suction opening and a pressure guiding opening; a first opening having a smaller diameter than the suction opening; A rubber sheet having a second opening smaller in diameter than the pressure opening;
The suction opening is provided such that the center of the opening and the center of the suction opening and the center of the second opening and the center of the pressure guiding opening substantially coincide with each other, and the suction hose connection pipe is connected to the suction opening. And one end of the first pressure guiding tube communicates with the inside of the garbage bag through the pressure guiding opening and the second opening, while communicating with the inside of the garbage bag through the first opening.

According to the above configuration, when the pressure inside the garbage bag is guided to the pressure sensor, this is realized by providing the mount with a special structure. Therefore, it is necessary to make the structure of the garbage bag itself special. Instead, it is economical to use a conventional trash bag simply by changing the mount. Also, a suction hose connecting pipe and a first
Pressure leakage inside the garbage bag from each joint between the pressure guiding tube and the garbage bag can be prevented, and the amount of garbage can be detected more accurately.

Further, in the vacuum cleaner according to the fourth aspect,
4. The vacuum cleaner according to claim 1, further comprising: a second impulse pipe provided at one end thereof so as to communicate with a ventilation path between the trash bag and the electric blower. 5. By connecting the other end to the pressure sensor, the pressure in the ventilation path between the dust bag and the electric blower is input to the pressure sensor.

With the above configuration, the pressure outside the trash bag can be input to the pressure sensor with a simple structure, and in combination with the configuration according to the second aspect, the pressure sensor and the inside of the trash bag can be input. Portions for inputting the pressure and the pressure outside the trash bag can be collected in, for example, a space (a dust collection lid) above a dust collection chamber that stores the trash bag, and can be compactly assembled.

Further, in the vacuum cleaner according to claim 5,
5. The vacuum cleaner according to claim 1, wherein the dust amount detector detects an amount of dust when a rotation speed of the electric blower is fixed. 6.

Further, according to the vacuum cleaner of the present invention, since the suction airflow is constant when the rotation speed of the electric blower is fixed, the error of the pressure difference due to the suction airflow can be reduced. In addition, the amount of dust can be more accurately detected.

Further, in the vacuum cleaner according to claim 6,
The vacuum cleaner according to any one of claims 1 to 5, wherein the rotation speed of the electric blower is controlled such that the maximum suction power of the vacuum cleaner is constant according to the amount of dust detected by the dust amount detection unit. Has a rotation speed control means for controlling the rotation speed.

Here, the relationship between the amount of collected dust and the rotation speed of the electric blower at which the suction power is a predetermined value can be obtained in advance by an experiment. If the rotation speed of the electric blower is controlled so that the rotation speed corresponds to the amount of dust detected in this data table, the maximum suction power can be kept constant. By doing so, it is possible to realize a stable suction force until the garbage bag becomes full regardless of the amount of collected dust. In addition, since the number of rotations is controlled instead of the driving voltage of the electric blower, there is no individual difference in suction power of the vacuum cleaner.

Further, in the vacuum cleaner according to claim 7,
The vacuum cleaner according to any one of claims 1 to 6, wherein a DC brushless motor is used as a motor constituting the electric blower.

With the above configuration, the number of rotations of the electric blower can be accurately and constantly kept constant, so that the amount of collected dust can be detected even more accurately, and the suction force can be further stabilized. Things.

[0027] In the vacuum cleaner according to claim 8,
The vacuum cleaner according to any one of claims 1 to 7, further comprising a dust amount notifying unit that performs a predetermined output according to the amount of dust detected by the dust amount detecting unit.

With the above arrangement, for example, display means is provided, and when the detected amount of dust is near the limit of the allowable amount of dust bags, a display output indicating that the dust bags are full is displayed on the display means. Thereby, it is possible to notify the user of the vacuum cleaner in a timely manner when to replace the trash bag.

[0029]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a vacuum cleaner according to an embodiment of the present invention. In the figure, 10
Is the first pressure guiding pipe, 11 is the second pressure guiding pipe, 12, 13
Is a pressure guiding tube, 14 is a pressure sensor, and 15 is a pressure sensor signal line. The same parts as those in FIG. 9 shown as the prior art are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 2 is an enlarged view of the vicinity of the garbage bag 7. The first pressure guiding pipe 10 is arranged in parallel with a suction hose connection pipe 8 for guiding the airflow sucked from the suction port 4 into the garbage bag 7. It is provided so that it may adjoin, and one end
The other end is provided outside the dust collection chamber 5 and communicates with the inside of the dust collection chamber cover 6 while communicating with the internal ventilation passage. The second pressure guiding pipe 11 has one end inside the dust collection chamber 5 and the outside of the trash bag 7, that is, a ventilation path between the trash bag 7 and the electric blower 16, and the other end connected to the dust collection chamber. 5 is provided so as to communicate with the inside of the dust collection chamber cover 6 outside.

The garbage bag 7 has a detachable backing sheet 21. As shown in FIG. 3, the backing sheet 21 has a suction opening 211 having the same diameter as the outer diameter of the suction hose connection pipe 8. And a pressure-guiding opening 212 having the same diameter as the outer diameter of the first same-pressure pipe 10. The rubber sheet 22 having the first opening 221 having a smaller diameter than the diameter and the second opening 222 having a smaller diameter than the outer diameter of the first pressure guiding tube 10 is formed by the first opening 221 and the suction opening 21.
1 and the center of the second opening 222 and the center of the pressure-guiding opening 212 are adhered so that they substantially coincide with each other.

Then, a suction hose connecting pipe 8
Through the suction opening 191 and the first opening 201,
The first pressure guiding tube 10 includes a pressure guiding opening 192 and a second opening 2.
One end of the garbage bag 7 penetrates through the mount 19 through the base material 02. The inside of the dust collecting chamber 5 and the outside on the suction side are hermetically sealed by a seal packing 21 provided on the dust collecting chamber lid 6.

The pressure sensor 14 is a differential pressure type sensor that outputs an electric signal corresponding to a difference between two input pressures. One input of the pressure sensor 14 is a dust collection chamber of the first pressure guiding pipe 10 via a pressure guiding tube 12. 5 is connected to an end communicating with the outside, and the other input is connected to an end communicating with the outside of the dust collecting chamber 5 of the second pressure guiding pipe 11 via a pressure guiding tube 13, and the output thereof is It is provided to the control device 17 by the pressure sensor signal line 15. The pressure sensor 14 is provided inside the dust collection chamber cover 6.

With the above configuration, the pressure sensor 14 performs an output in accordance with the pressure difference between the pressure in the ventilation path inside the dust bag 7 and the pressure in the ventilation path outside the dust bag. FIG. 4 shows that the pressure difference increases in proportion to the amount of dust, and that the pressure difference differs depending on the rotation speed of the electric blower 16 even if the amount of dust is the same. Therefore, if the pressure difference and the number of rotations of the electric blower 16 are known, the amount of dust can be accurately detected.

When the amount of dust increases, the dust bag 7
Since the external pressure increases and the pressure inside the garbage bag decreases, the pressure difference is more sensitive to a change in the amount of dust than the pressure outside the trash bag 7 alone. The pressure inside the garbage bag 7 and the pressure outside the garbage bag fluctuate greatly depending on the state of the suction port 4 being in contact with the floor surface.
Fluctuations due to the grounding state of the suction port on the floor are canceled out, and are not affected by the grounding state of the suction port on the floor.

Also, the pressure inside the trash bag 7 is guided to the pressure sensor 14 by not having the trash bag 7 itself in a special structure, but having a special structure in the mount. Therefore, the conventional garbage bag can be used only by changing the mount, which is economical. Furthermore, it is possible to prevent pressure leakage inside the garbage bag 7 from the suction hose connection pipe 8 and the respective joints between the first pressure guiding tube 10 and the garbage bag 7, and the amount of collected dust can be more accurately determined. Can be detected.

Next, the configuration of the control device 17 is shown in FIG.
In the figure, DC power obtained from a rectifier circuit 31 and a smoothing capacitor 32 from a commercial power supply is supplied to an inverter 33. Inverter 33 has six FETs 331 to 3
36 and six reflux diodes 337 to 342, the output voltage of which is the output voltage of the high-voltage side FETs 331 and 33 of the supplied DC voltage.
The energization periods (electrical angle 120 degrees) of 2,333 are controlled by pulse width modulation and chopper operation. Further, the FETs 334 and 3 on the low potential side of the supplied DC voltage
The low resistance 34 is commonly connected to the drain terminals 35 and 336.

Reference numeral 51 denotes a DC brushless motor in the electric blower 16, which is a rotor 5 having a four-pole permanent magnet as a field.
11, an armature winding 512 and a magnetic sensor 513 for detecting the position of the rotor 511. The position detection circuit 35 receives an output from the magnetic sensor 513 and generates a signal corresponding to the position of the rotor 511. The microcomputer 39 determines the rotation speed of the DC brushless motor 51, that is, the rotation speed of the electric blower 16, based on the signal generated by the position detection circuit 35. In response to the voltage drop at the low resistance 34, the current detection circuit 36 generates a signal corresponding to the drive current of the DC brushless motor 51 and supplies the signal to the microcomputer 39.

The drive circuit 37 includes a microcomputer 39
FE constituting the inverter 33
This is a circuit for driving T331 to T336. Note that the pulse width modulation circuit 38 includes the FETs 331, 332,
333 is a circuit for pulse width modulation of the energization period.

The microcomputer 39 includes a CPU 39
1, a ROM 392, and a RAM 393, which are connected by an address bus, a data bus, and a control bus (not shown), respectively.
According to the outputs of the position detection circuit 35 and the current detection circuit 36,
The drive of the DC brushless motor 51, that is, the electric blower 16 is controlled through the drive circuit 37 and the inverter circuit 33.

The ROM 392 stores the DC brushless motor 5
1 as well as various programs such as differential pressure data for each rotational speed. RAM393
Is composed of a recording unit for reading and writing various data required when the CPU 391 executes various programs in the ROM 392.

In the above configuration, the operation of the microcomputer 39 for controlling the rotation speed of the DC brushless motor 51, that is, the rotation speed of the electric blower 16, will be described.
This will be described with reference to the flowchart shown in FIG. First, when the operation switch on the operation unit 18 is turned on (#
601), the DC brushless motor 51 is started (# 602), and the rotation speed is controlled to be N1 (# 603). The rotation speed N1 is given from the rotation speed instruction circuit 40.

Next, when the rotation speed of the DC brushless motor 51 is fixed at N1 (Y in # 604), the pressure sensor 1
4 is input as differential pressure data (# 605), and referring to the data table shown in FIG. 7 in the ROM 392, the control rotational speed corresponding to the differential pressure data and the current rotational speed is determined. The number of rotations of the DC brushless motor 51 is controlled (# 606). As a specific example, when the rotation speed is N1 and the differential pressure data is P12, the rotation speed is N
The number of rotations of the DC brushless motor 51 is controlled so as to be 2.

The control rotation speed is the maximum rotation speed N.
When the maximum is reached (Y in # 607), a predetermined display is performed on the display unit 19 (# 608). When the control speed is Nmax
If not (N in # 607), the display unit 19
If a predetermined display is displayed, the display is stopped.

Next, when the rotation speed of the DC brushless motor 51 is fixed at the control rotation speed (Y in # 609), it is determined whether or not the operation switch is turned off (# 610), and the operation switch is turned off. If it is (Y of # 610), the DC brushless motor 51 is stopped (# 611), and # 601
Returning to the above, if the operation switch is not turned off (#
610, N), and return to # 605.

With the above control, the number of rotations of the electric blower 16 is controlled in accordance with the number of rotations and the differential pressure data, that is, in accordance with the amount of collected dust. The control rotation speed of the data table shown in FIG. 7 is the same as the rotation speed obtained by the experiment, in which the suction power is equal for each pair of the rotation speed and the differential pressure data, that is, for each amount of dust. Has become.

Therefore, as shown in FIG. 8, the maximum suction power of the vacuum cleaner can be kept constant irrespective of the amount of dust, and the excellent suction force can be stabilized until the amount of dust is full. Can be provided. Further, since the electric blower 16 (DC brushless motor 51) is controlled not by the driving voltage but by the number of rotations, there is no individual difference in the suction power of the vacuum cleaner.

Since the DC brushless motor 51 is employed as a motor constituting the electric blower 16,
The number of revolutions can be set finely, realizing a more stable suction force.

Further, when the rotation speed to be fixed next reaches Nmax, which is the maximum rotation speed, the amount of dust at this time is near the allowable limit of the dust bag.
For example, a predetermined display such as "full" is displayed at 9 so that the user can be notified in a timely manner when the garbage bag should be replaced.

In the above control shown in FIG. 6, the rotation speed is always fixed at N1 when the power is turned on.
Instead of this, every time the control speed changes, the changed control speed is updated and recorded in the non-volatile memory, and is fixed to the number of revolutions recorded in the non-volatile memory when the power is turned on. It may be. In this way, the number of rotations is fixed to the amount of dust from the time the power is turned on (assuming that the dust bag has not been replaced), and the time from when the suction force is exerted is sufficient. Is shortened.

[0051]

As described above, according to the vacuum cleaner of the first aspect, the amount of dust is determined by the pressure difference between the pressure inside the dust bag and the pressure outside the dust bag and the rotation speed of the electric blower. Since the apparatus has the dust amount detecting means for detecting, the amount of dust can be detected more accurately and accurately.

According to the second aspect of the present invention, the pressure inside the garbage bag can be input to the pressure sensor with a simple structure, and the garbage bag at the portion where the first pressure guiding tube is provided. Since the internal pressure changes most sensitively to the change in the amount of dust, the amount of dust can be detected more accurately.

According to the third aspect of the invention, when the vacuum cleaner according to the second aspect is realized,
It is economical to use a conventional garbage bag simply by changing the backing paper, and it is possible to prevent pressure leakage in the ventilation path inside the garbage bag and detect the amount of garbage more accurately. be able to.

According to the vacuum cleaner of the fourth aspect, the pressure outside the garbage bag can be input to the pressure sensor with a simple structure, and by combining with the structure of the second aspect, The pressure sensor and the part for inputting the pressure inside the trash bag and the pressure outside the trash bag can be integrated into, for example, a space (a dust collection lid) above a dust collection chamber for storing the trash bag, and can be compact. Can be summarized.

Further, according to the vacuum cleaner of the present invention, since the suction air volume is constant when the rotation speed of the electric blower is fixed, the error of the pressure difference due to the suction air volume can be reduced. In addition, the amount of dust can be more accurately detected.

Further, according to the vacuum cleaner of the present invention, a stable suction force can be realized until the dust bag becomes full regardless of the amount of dust collected. In addition, since the number of rotations is controlled instead of the driving voltage of the electric blower, there is no individual difference in suction power of the vacuum cleaner.

According to the electric vacuum cleaner of the present invention, the number of rotations of the electric blower can be kept constant with high accuracy, so that the amount of collected dust can be detected even more accurately. Thus, the suction force can be made more stable.

Further, according to the vacuum cleaner of the present invention, it is possible to notify the user of the vacuum cleaner in a timely manner when to replace the trash bag.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a vacuum cleaner according to an embodiment of the present invention.

FIG. 2 is an enlarged view around a garbage bag 7;

FIG. 3 is a diagram showing details of a garbage bag 7;

FIG. 4 is a diagram showing the relationship between the amount of dust collected in the dust bag 7, the pressure difference, and the rotation speed of the electric blower.

FIG. 5 is a diagram illustrating a configuration example of a control device 17;

FIG. 6 is a flowchart of control of the rotation speed of the DC brushless motor 51 by the microcomputer 39.

7 is a ROM 39 referred to in the control shown in FIG.
2 is an image diagram of a data table in FIG.

FIG. 8 is a diagram showing the relationship between the amount of dust collected and the suction power in the vacuum cleaner of the present embodiment.

FIG. 9 is a diagram showing a schematic configuration of a conventional vacuum cleaner.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Vacuum cleaner main body 2 Suction hose 3 Extension pipe 4 Suction port 5 Dust collection chamber 6 Dust collection chamber lid 7 Trash bag 8 Suction hose connection pipe 9 Exhaust port 10 1st pressure-introduction pipe 11 2nd pressure-induction pipe 12, 13 Pressure guiding tube 14 Pressure sensor 15 Pressure sensor signal line 16 Electric blower 17 Control device 18 Operation unit 19 Display unit 21 Mount 211 Suction opening 212 Pressure guiding opening 22 Rubber sheet 221 First opening 222 Second opening 23 Seal Packing 31 Rectifier circuit 32 Smoothing capacitor 33 Inverter 331, 332, 333, 334, 335, 336
FETs 337, 338, 339, 340, 341, 342
Diode for free circulation 34 Low resistance 35 Position detection circuit 36 Current detection circuit 37 Drive circuit 38 Pulse width modulation circuit 39 Microcomputer 391 CPU 392 ROM 393 RAM 40 Revolution number instruction circuit 51 DC brushless motor 511 Rotor 512 Armature winding 513 Magnetic field Sensor

Claims (8)

[Claims] 1. An electric blower serving as a dust collection source, provided between the electric blower and a suction port, and driving the electric blower to collect dust contained in an airflow sucked from the suction port. In a vacuum cleaner having a garbage bag, a rotation number detecting means for detecting a rotation number of the electric blower, a pressure of a ventilation path inside the garbage bag, and a pressure of a ventilation path between the garbage bag and the electric blower. And a pressure sensor for detecting a difference between these two pressures, and an amount of dust collected in the dust bag by the rotation speed detected by the rotation speed detecting means and the pressure difference detected by the pressure sensor. A dust amount detecting means for detecting the amount of dust. 2. A suction hose connecting pipe for guiding an air flow sucked from the suction port into the garbage bag, adjacent to the suction hose connection pipe, and one end of the pipe is provided so as to communicate with an air passage inside the garbage bag. It has a 1st impulse line, The pressure of the ventilation path inside the garbage bag is inputted into the pressure sensor by connecting the other end of the 1st impulse line to the pressure sensor. Item 6. The vacuum cleaner according to Item 1. 3. The garbage bag has a backing provided with a suction opening and a pressure guiding opening, and a suction hose connection pipe is provided on a surface of the backing inside the garbage bag. A rubber sheet having a first opening smaller than the outer diameter of the first opening and a second opening smaller than the outer diameter of the first pressure guiding tube;
The center of the first opening and the suction opening, the second
An opening and a center of the pressure guiding opening are provided so as to substantially coincide with each other, and the suction hose connection pipe is connected to the first pressure guiding tube via the suction opening and the first opening. The vacuum cleaner according to claim 2, wherein one end of the vacuum cleaner communicates with the inside of the garbage bag through the pressure guiding opening and the second opening. 4. A second pressure guiding tube having one end connected to a ventilation path between the dust bag and the electric blower, and the other end of the second pressure guiding tube connected to the pressure sensor. The vacuum cleaner according to any one of claims 1 to 3, wherein the pressure in the ventilation path between the dust bag and the electric blower is input to the pressure sensor. 5. The vacuum cleaner according to claim 1, wherein the dust amount detector detects the amount of dust when the rotation speed of the electric blower is fixed. 6. A rotating speed control means for controlling the rotating speed of the electric blower so that the maximum suction power of the vacuum cleaner is constant according to the amount of dust detected by the dust amount detecting means. The vacuum cleaner according to any one of claims 1 to 5, comprising: 7. The vacuum cleaner according to claim 1, wherein a DC brushless motor is used as a motor constituting the electric blower. 8. The vacuum cleaner according to claim 1, further comprising a dust amount notifying unit that outputs a predetermined amount according to the amount of dust detected by the dust amount detecting unit.