JPH07322989A - Vacuum cleaner - Google Patents

Abstract

PURPOSE:To provide a vacuum cleaner capable of stably giving sucking force in response to the dust quantity in a dust collection chamber for comfortable cleaning. CONSTITUTION:This vacuum cleaner is provided with a controller (1) 11 setting the phase control angle of a motor 1 with the signal of a dust sensor section 12 detecting the dust passing through an air passage and a controller (2) 5 setting the phase control angle of the motor 1 with the signal of a pressure sensor section 7 detecting the vacuum pressure in a dust collection chamber 18. The phase control angle of the motor 1 is determined based on the respective phase control angles, and the sucking force in response to the dust quantity is stably provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vacuum cleaner which detects the amount of dust passing through an air flow path and the vacuum pressure in a dust collecting chamber and controls the suction force by using them.

[0002]

2. Description of the Related Art In recent years, there has been a strong demand for easy cleaning in a short time. Also, floors of various materials,
With the introduction of carpets and the like, the targets for cleaning are diversifying. Therefore, in order to satisfy these requirements, an increasing number of electric vacuum cleaners use a hand-held operation unit or an electronic circuit inside the main body to change the suction force.

A conventional electric vacuum cleaner will be described below. As shown in FIGS. 6 and 7, the cleaner body 50 includes a dust collection chamber, a motor 1, a cord reel, and the like, and the cleaner body 50 includes a hose 51, a hand operation unit 52, and an extension pipe 53. The nozzle 54 is attached.

The hand operation unit 52 has a control means and outputs a signal for controlling the phase of the motor 1. This signal controls the firing angle of the bidirectional thyristor 2 to control the electric power supplied to the motor 1.

The control means includes a power supply section 8 for supplying electric power to the inside thereof, a zero volt detection section 9 for detecting a zero volt point of an AC power supply, and a switch section 13 for the user to select whether the operation is turned on or off. The display unit 14 displays an operating state and the like, the dust sensor unit 12 detects dust passing through the air flow path, and the phase control transmission unit 6 outputs a phase control signal in response to a signal from the control unit 16.

There is also a method of detecting the vacuum pressure in the dust collecting chamber and controlling the phase control angle of the motor 1 according to the vacuum pressure with the same configuration as described above.

By using the above structure, there is an advantage that the user can easily perform the cleaning without manually adjusting the suction force of the vacuum cleaner.

[0008]

However, the conventional method using the dust sensor section 12 has a drawback that the suction force is reduced when much dust or the like is accumulated in the dust collecting chamber inside the cleaner body 50. Further, in the method using the vacuum pressure, since the vacuum pressure in the dust collecting chamber changes depending on the state of the nozzle 54 and the floor surface, there is a limit to the control of the suction force by changing the amount of dust.

The present invention solves the above-mentioned problems of the prior art. Even when dust in the dust collecting chamber increases and the suction force tends to decrease, the vacuum pressure in the dust collecting chamber is detected and the suction force decreases. The first purpose is to be able to comfortably clean by controlling the motor so as to suppress the above. In addition, even when the vacuum pressure in the dust collection chamber is increased or when the amount of dust in the air flow path is large, the control is performed so that a stronger suction force is generated, and it is possible to clean comfortably.
The purpose of. In addition, it prevents the unsafe operation and failure due to the heating of the motor that occurs when a large amount of dust is accumulated in the dust collection chamber or when the air flow path is clogged with dust, etc. The third purpose is to stretch. A fourth object is to provide a pressure sensor that is inexpensive and has excellent durability.

[0010]

In order to achieve the first object, an electric vacuum cleaner according to the present invention is provided with a dust sensor unit for detecting passage of dust and the like in an air flow path, and a vacuum pressure in a dust collection chamber. A pressure sensor unit for detecting the pressure sensor, and a control unit for controlling the motor in the cleaner body according to the signals of the dust sensor unit and the pressure sensor unit. When controlling the motor speed so that if the dust sensor detects a dust amount above a predetermined value, the motor speed is added to a preset value to control the motor. Two
In order to achieve the purpose of, the motor phase control angle and dust calculated based on the signal of the pressure sensor unit by the control unit that controls the motor in the cleaner body according to the signals of the dust sensor unit and the pressure sensor unit. In order to compare the motor phase control angle calculated based on the signal of the sensor unit and to make the phase control angle with a high rotation speed the final value, and to achieve the third object The control unit that controls the electric power supplied to the motor inside the cleaner body according to the signals of the dust sensor and the pressure sensor causes the pressure sensor to detect a predetermined pressure value or more, and the dust sensor does not detect dust. In this case, it is determined that a large amount of dust is accumulated in the dust collection chamber or dust is generated inside the air flow path, and the electric power supplied to the motor is controlled to be a predetermined value or less. In order to achieve the above, the pressure sensor unit includes a pipe, a cylinder, a piston that slides inside the cylinder by the pressure inside the cylinder, a spring that presses the piston in the direction opposite to the pipe, and a slide connected to the piston. The configuration includes a plate, a resistor and a sliding piece that are in contact with a position where the sliding plate moves, and an electric terminal.

[0011]

In these configurations, the vacuum pressure in the dust collection chamber is detected by using the pressure sensor unit, the vacuum pressure value is converted into the resistance value and sent to the control unit, and the dust sensor unit is used to perform the air flow passage. The amount of dust passing inside is detected and sent as a pulse to the control unit.At the control unit, the phase control angle of the motor corresponding to the resistance value from the pressure sensor unit is set, and the number of pulses from the dust sensor unit and The amount of dust is determined by the pulse length, and when the amount of dust is greater than or equal to a predetermined value, the final motor phase control angle is set by adding it to the already set motor phase control angle. In the control unit, the motor phase control angle set corresponding to the resistance value from the pressure sensor unit and the motor phase control angle corresponding to the dust amount determined by the number of pulses and pulse length from the dust sensor unit are compared. However, the motor is controlled with the phase control angle at which the rotation speed of the motor increases as the final phase control angle of the motor. Further, in the control unit, when the resistance value from the pressure sensor is equal to or higher than a predetermined value and the amount of dust calculated by the number of pulses and the pulse length from the dust sensor unit is equal to or lower than the predetermined value, dust or the like is collected in the dust collection chamber. It is determined that a large amount is accumulated or dust or the like is clogged in the air flow path, and the electric power supplied to the motor is controlled to be a predetermined value or less. Also, when the vacuum pressure in the dust collection chamber rises, the piston, which was pressed by the spring in the direction opposite to the pipe,
It moves to a position that is equal to the spring pressure, and with the movement of the piston, the sliding plate connected to the piston slides on the resistor and the resistance value between the electrical terminals equipped on the pressure sensor changes. Will be done.

[0012]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, the motor 1 is built in the cleaner body 3 and is controlled by the bidirectional thyristor 2 by signals from the control unit (2) 5 and the phase control transmission unit 6. The control unit (1) 11 uses the signal from the zero volt detection unit 9 provided for synchronizing the power source from the power source unit 8 that supplies a stable power source and the AC power source 4, and uses the signal from the dust sensor unit 12. Set the motor control phase angle according to. The control unit (2) 5 sets the phase control angle of the motor according to a signal from the pressure sensor unit 7 arranged in the passage of the dust collection chamber 18 so that the vacuum pressure in the dust collection chamber 18 can be measured. However, the control for changing the phase control angle is performed so that the change of the suction force is reduced according to the change of the vacuum pressure.
Further, the value of the phase control angle from the control unit (1) 11 is added to obtain the final motor phase control angle. That is, the motor 1 is controlled by the motor phase control angle corresponding to the value detected by the pressure sensor unit 7 provided in the dust collection chamber 18, but when the amount of dust passing through the air flow path becomes a predetermined value or more, The phase control angle of is the phase control angle according to the amount of dust. In the figure, 10 is an electronic circuit, 17 is a hose, 19 is a dust collecting bag, and 20 is a cord reel.

In the operation of the electric vacuum cleaner configured as described above, the relationship between the air volume and the vacuum pressure is as shown by the curve 21 at the maximum rated operation as shown in FIG. The curve 22 is displayed during control. When the passage of dust is not detected, the air volume decreases as the vacuum pressure increases, but by controlling the motor 1 according to the vacuum pressure,
As shown by the curve 23 in FIG. 3B, the decrease in the air volume can be suppressed to some extent. Furthermore, if the amount of dust is equal to or greater than the predetermined value, it is possible to obtain the amount of air according to the amount of dust as shown by the curve 24 in FIG.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to FIG.

FIG. 4A shows the phase control angle set by the signal from the dust sensor section 12 with an AC waveform added, and FIG. 4B shows the phase control set by the signal from the pressure sensor section 7. AC waveform added to the corner, Fig. 4
Finally, (c) shows the voltage across the bidirectional thyristor 2. As shown in the figure, in each of the phase control angles of the dust sensor unit 12 and the pressure sensor unit 7, the phase control angle that increases the power supply is the final phase control angle. Therefore, when a stronger suction force is required, the motor rotation speed is automatically increased, and the dust collection efficiency can be improved.

(Embodiment 3) A third embodiment of the present invention will be described below.

Since the structure of this embodiment is the same as that of the first embodiment, the description thereof will be omitted. The operation will be described with reference to FIG. If a large amount of dust is accumulated in the dust collection bag, or if dust is clogged in the hose 17 or extension pipe, the dust collection chamber 1
The vacuum pressure in 8 rises abnormally. Therefore, the air volume decreases, that is, the cooling air of the motor 1 decreases, and the motor 1 may be abnormally heated. In the present embodiment, when the pressure sensor unit 7 detects a pressure equal to or higher than a predetermined value, the control as shown by the curve 25 is performed so as to decrease the rotation speed of the motor 1 for a certain period of time, whereby the abnormal heating of the motor 1 is performed. Can be prevented.

(Fourth Embodiment) The fourth embodiment of the present invention will be described below. As shown in FIG. 5, the pressure sensor unit 7
The pipe 30 is connected to the inside of the dust collecting chamber 18 of the cleaner body, and has a function of connecting the inside of the cylinder 31 following the pipe 30 to the inside of the dust collecting chamber 18. Inside the cylinder 31, there is a piston 32 that moves according to the vacuum pressure inside the cylinder 31. The piston 32 is a spring 33
Is pressed so that it is located in the opposite direction to the pipe 30. However, when the pressure inside the cylinder 31 becomes negative, the piston 32 moves to a position where it becomes equal to the spring pressure of the spring 33. The movement of the piston 32 depends on the connecting rod 34.
And the sliding plate 35 connected to the connecting rod 34 is operated. One of the sliding plates 35 is a resistor 36.
, And the other is in contact with the sliding piece 37. Therefore, the resistance value changes in accordance with the vacuum pressure in the dust collection chamber 18.

With the above structure, the pressure sensor portion 7 has a simple structure, is inexpensive, and has good durability, so that the failure rate is reduced and the reliability can be improved.

[0021]

As is apparent from the above description, according to the present invention, since the suction force according to the amount of dust and the vacuum pressure can be obtained, it is not necessary to manually control the suction force by the user. It is possible to clean comfortably, to prevent the motor from heating up, to prevent unsafe operation, to prevent problems, etc., and to provide a pressure sensor with a simple structure that is inexpensive and has good durability. It is possible to realize an excellent vacuum cleaner.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an electronic circuit of a vacuum cleaner according to a first embodiment of the present invention.

FIG. 2 is a schematic sectional view of a cleaner body of the electric vacuum cleaner.

FIG. 3 is a diagram showing the relationship between the air volume and the vacuum pressure when the electric vacuum cleaner operates.

FIG. 4 is a graph of a phase control angle of the electric vacuum cleaner according to the second embodiment of the present invention.

FIG. 5 (a) is a schematic cross-sectional view of a pressure sensor part of an electric vacuum cleaner according to a fourth embodiment of the present invention, and (b) is a circuit diagram of the pressure sensor part.

FIG. 6 is an external perspective view of a conventional vacuum cleaner.

FIG. 7 is a block diagram of an electronic circuit of the electric vacuum cleaner.

[Explanation of symbols]

 1 Motor 5 Control Section (2) 6 Phase Control Transmission Section 7 Pressure Sensor Section 11 Control Section (1) 12 Dust Sensor Section 15 Hand Control Section 30 Pipe 31 Cylinder 32 Piston 33 Spring 35 Sliding Plate 36 Resistor 37 Sliding Piece 38, 39, 40 electrical terminals

Claims (4)

[Claims] 1. A dust sensor unit for detecting passage of dust in an air flow path, a pressure sensor unit for detecting vacuum pressure in a dust collection chamber, and a vacuum cleaner in response to signals from the dust sensor unit and the pressure sensor unit. A control unit for controlling the rotation speed of the motor inside the main body is provided, and when setting the rotation speed based on the signal of the pressure sensor unit so that the suction force is constant,
An electric vacuum cleaner characterized in that control is performed so as to increase the number of rotations for dust amount of a predetermined value or more. 2. A dust sensor unit for detecting the passage of dust in the air flow path, a pressure sensor unit for detecting the vacuum pressure in the dust collection chamber, and a vacuum cleaner in response to signals from the dust sensor unit and the pressure sensor unit. Equipped with a control unit that controls the rotation speed of the motor inside the main body, comparing the rotation speed calculated based on the signal of the pressure sensor and the rotation speed calculated based on the signal of the dust sensor unit, a high rotation speed value The electric vacuum cleaner is characterized by controlling so that the final rotation speed. 3. A dust sensor section for detecting the passage of dust in the air flow path, a pressure sensor section for detecting the vacuum pressure in the dust collecting chamber, and cleaning in response to signals from the dust sensor section and the pressure sensor section. A control unit for controlling the rotation speed of the motor inside the machine body is provided, and the rotation speed of the motor is reduced when the pressure sensor detects a vacuum pressure of a predetermined value or more and the dust sensor unit does not detect dust. Vacuum cleaner that is characterized by controlling as follows. 4. The pressure sensor unit includes a pipe serving as an air flow path, a cylinder continuing from the pipe, a piston that slides inside the cylinder according to the pressure inside the cylinder, and the piston is always the pipe. Is a spring that presses in the opposite direction, a sliding plate that is connected to the piston and slides in accordance with its operation, a resistor and a sliding piece that are attached to the position where the sliding plate moves, and the sliding plate. The electric vacuum cleaner according to any one of claims 1 to 4, further comprising a moving plate, the resistor, and an electric terminal attached to the sliding piece.