JPH05253153A - Dust detector for vacuum cleaner - Google Patents

Abstract

PURPOSE:To heighten convenience for use by controlling the input preset value of a fan motor, the fan motor and display in accordance with dust quantity at that time in the dust detector of a vacuum cleaner. CONSTITUTION:The input setting part 26 of the fan motor 27 is composed of only a simply-connected resistor 29, and the comparative arithmetic operation of an output value in accordance with the input preset value of the fan motor 27 with the dust quantity at that time can be performed by employing such constitution that a detection voltage conversion part 25 which converts input to a voltage in accordance with the dust quantity by the signal of a light receiving part 3, and an arithmetic part 31 which performs the comparative arithmetic operation with the output of the input setting part 26 of the fan motor 27 are provided, and the control for the fan motor 27 and the display are performed by such output. Thereby, since the fan motor 27 and the display can be controlled, it is possible to inexpensively and easily design operability fitted in the preset input of the fan motor 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust detector for an electric vacuum cleaner, which detects dust passing through an air passage of the electric vacuum cleaner to control a fan motor and a display.

[0002]

2. Description of the Related Art A conventional dust detector for an electric vacuum cleaner will be described below.

As shown in FIGS. 3 and 4, a light emitting diode 44 is disposed in a suction passage 43 extending from a floor suction port 51 of an electric vacuum cleaner to a suction port 42 of a cleaner body, and a light emitting diode 44 facing the light emitting diode 44. The phototransistor 45 is provided, and the light from the light emitting diode 44 is received by the phototransistor 45.

The voltage change amplifier 34 includes resistors 46, 47,
48, a capacitor 49, and an OP amplifier 50, the comparing section 37 is composed of resistors 53, 54, 55, and an OP amplifier 56, and the input setting section 35 is set to have different total resistance values. Variable type resistors 62, 6
3 and a resistor 57.

In the figure, 36 is a phase controller, 39 is a fan motor, 58 and 59 are transistors, and 60 and 61 are relays.

The operation of the dust detecting device for the electric vacuum cleaner configured as above will be described below.

If dust is contained in the suction airflow flowing through the suction passage 43 during the cleaning work, the light emitted from the light emitting diode 44 is blocked by the dust, and the amount of light received by the phototransistor 45 is reduced and the output voltage is reduced. growing. As a result, the output voltage of the voltage change amplification unit 34 once decreases and then increases. Since the dust detection time is extremely short and the fan motor 39 cannot be controlled, the voltage change is converted by the capacitor 52 as shown in FIG. Then, the output voltage of the comparison unit 37 is 5V in the steady state, but once the dust passes, the output voltage once decreases to 0V, and then returns to 5V again after a fixed time. The output of the comparison unit 37 is the transistors 58 and 59.
The transistor 59 is turned on when there is no dust, and the transistor 58 is turned on when dust passes. As a result, the relay 60 or 61 is selected, and the double variable resistor 62 or 63 of the input setting unit 35 is selected. Therefore, the output voltage of the input setting unit 35 changes depending on the presence or absence of dust, and the phase control unit 36 receives this and controls / drives the input of the fan motor 39. By this operation, the input of the fan motor 39 is controlled by a constant input when dust is detected as shown in FIG. At the same time, the output voltage of the comparison unit 37 is input to the display unit 38, the display element 40 is turned on when there is no dust, and the display element 41 is turned on when dust is passing through. This informs the detection state of dust.

[0008]

However, in the above-mentioned conventional configuration, a large amount of time is spent to secure the characteristics of the two variable resistors 62 and 63, and at the same time the relay 60,
Since 62 is also used, the cost increases, the problem that fine control cannot be performed according to the amount of dust, and the time after dust detection is constant regardless of the setting input of the fan motor 39. Therefore, if the same time has not elapsed when setting weak input or when setting strong input, the input state set by the user does not return, and strong input is used when you want to perform cleaning gently (with weak input). The state lasted for a long time, and there was a problem that it became a dissatisfaction point in use.

The present invention solves the above-mentioned problems of the prior art, and it is possible to obtain the operability according to the setting input of the fan motor, and it is easy to design, the cost and the vacuum cleaner are excellent in usability. An object of the present invention is to provide a dust detection device.

[0010]

In order to achieve this object, a dust detection device for an electric vacuum cleaner according to the present invention emits light into an air passage through which suction air flows, and receives light from the light emitting unit. A light receiving unit that outputs a signal according to the amount of received light, a detection voltage conversion unit that converts the voltage of the light receiving unit into a voltage that corresponds to the amount of dust, an input setting unit that sets the input of the fan motor, and a detection voltage conversion unit And a calculation unit for comparing and calculating the output of the input setting unit, a fan motor control unit for controlling the fan motor by the signal of the calculation unit, and a display control unit for controlling the display unit by the signal of the calculation unit.

[0011]

In this configuration, the fan motor and the display unit are controlled by the value obtained by comparing and calculating the input set value of the fan motor and the output value corresponding to the amount of dust at that time.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a light receiving portion 3 for receiving light from a light emitting portion 1 using a light emitting diode 2 arranged in an air passage through which intake air flows and outputting a signal according to the amount of received light is provided. Uses a phototransistor 4 and a resistor 5. The amplification unit 6 that amplifies the signal of the light receiving unit 3 includes resistors 7,
8, a capacitor 9 and an OP amplifier 10.
The delay unit 11 that temporarily holds detection of dust is
It is composed of the resistor 12, the capacitor 13, and the diode 14, and it is possible to eliminate malfunction of the light receiving unit 3 due to disturbance such as static electricity. This output signal is generated by resistors 15, 1
Comparing unit 1 composed of 6, 17 and OP amplifier 18
9 is input and it is determined whether or not dust detection is performed. And
The detection voltage conversion unit 25 including the resistors 20, 21, 22 and the capacitor 23 and the transistor 24 receives the output of the light receiving unit 3 and converts the dust detection time into a voltage level. That is, the capacitor 23 is discharged at the same time as the dust detection, but is gradually charged for a time determined by the characteristic values of the resistor 22 and the capacitor 23. That is, the output voltage of the detection voltage conversion unit 25 is 5 V when dust is not detected and 0 V when dust is detected.

On the other hand, the input setting section 26 for setting the input of the fan motor 27 is composed of a resistor 28 and a variable resistor (single station) 29, which has a high resistance when the weak input is set and a low resistance when the strong input is set. Then, the output voltage of the input setting section 26 becomes a voltage when the weak input is set: 3V and a voltage when the strong input is set: 0V. Then, the detection voltage conversion unit 25 and the input setting unit 26
The output voltage of the operation unit 31 is composed of the diode 30.
Is compared and calculated, and this output voltage is 5 when dust is not detected.
V, when dust is detected: 0V, which returns to a non-detection voltage after dust is detected, but the returning time varies depending on the input set value at this time. The output of the calculation unit 31 is input to the fan motor control unit 32 and the display control unit 33, and control can be performed according to the input set value and the amount of dust at that time.

The operation of the dust detection device for the electric vacuum cleaner configured as described above will be described with reference to FIG.

When the input setting unit 26 is set to a weak input, the output of the calculation unit 31 is 5V unless dust is detected. When dust is detected here, the output voltage of the detection voltage conversion unit 25 tries to drop to 0V, but the output voltage of the detection voltage conversion unit 25 is clipped at about 3V by the diode 30 of the calculation unit 31. After passing the dust, the output voltage of the detection voltage conversion unit 25 returns to 5V,
The voltage of the arithmetic unit 31 also returns to 5V. However, when the input setting unit 26 is set to a strong input, the output of the calculation unit 31 is 5V when dust is not detected, but when dust is detected, the output voltage of the detection voltage conversion unit 25 is 0V. And is not clipped by the diode 30 of the arithmetic unit 31. After the dust has passed, the output voltage of the detection voltage conversion unit 25 returns to 5V, so the voltage of the calculation unit 31 also returns to 5V.
This time is longer than the time when the weak input is set.
Therefore, the fan motor control unit 32 performs control by the output of the calculation unit 31 for a longer time when the strong input is set than when the weak input is set, and the display control unit 33 also performs the same control. , The control is performed such that the dust detection time becomes longer when the strong input is set than when the weak input is set.

That is, by using the output of the arithmetic unit 31, more detailed control can be performed according to the input set value and the amount of dust at that time.

As described above, according to the present embodiment, the variable resistor 29 as the input setting section 26 may be a single resistor, and the time required to secure the characteristics of the two resistors as in the prior art is unnecessary, so that the design time is reduced. It can be shortened. At the same time, the relays used in the past are not required, so that the cost can be reduced.

At the same time, one input set value of the fan motor 27 and an output value corresponding to the amount of dust at that time are compared and calculated, thereby controlling the fan motor 27 and the display unit to set the fan motor 27. The operability according to the input can be obtained.

[0020]

As is apparent from the above description of the embodiment, the present invention determines the amount of dust by the signal of the light receiving portion according to the light receiving amount from the light emitting portion arranged in the air passage through which the suction air flows. A detection voltage conversion unit that converts the voltage to a corresponding voltage, an input setting unit that sets the input of the fan motor, a calculation unit that compares and calculates the outputs of the detection voltage conversion unit and the input setting unit, and fan motor control based on the signals of the calculation unit With the configuration that includes the control unit and the display control unit, it is possible to obtain operability according to the setting input of the fan motor, and realize a dust detection device for vacuum cleaners that is easy to design, cost effective, and easy to use. It is possible.

[Brief description of drawings]

FIG. 1 is a block circuit diagram of a dust detection device for an electric vacuum cleaner according to an embodiment of the present invention.

FIG. 2 (a) is a graph showing an output of a comparison unit depending on the presence / absence of dust in the dust detection device of the same vacuum cleaner, (b) is a graph showing an output of the detection voltage conversion unit of the above, and (c) is the same as above. A graph showing the relationship between the output of the detection voltage conversion unit and the output of the input setting unit (d) is a graph showing the relationship between the output of the detection voltage conversion unit and the output of the arithmetic unit

FIG. 3 is a block circuit diagram of a conventional dust detection device for an electric vacuum cleaner.

FIG. 4 is a cross-sectional view of the main parts of the dust detection device of the electric vacuum cleaner.

FIG. 5 is a graph showing the relationship between the output of the OP amplifier and the voltage change of the capacitor depending on the presence or absence of dust in the dust detection device of the vacuum cleaner.

FIG. 6 is a graph showing the relationship between the input value of the fan motor and the setting value of the input setting unit of the dust detection device of the vacuum cleaner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Light emitting unit 3 Light receiving unit 25 Detection voltage converting unit 26 Input setting unit 31 Computing unit 32 Fan motor control unit 33 Display control unit

Claims (1)

[Claims] 1. A light emitting portion arranged in an air passage through which suction air flows, a light receiving portion for receiving light of the light emitting portion and outputting a signal according to a light receiving amount, and the suction air according to a signal of the light receiving portion. A detection voltage conversion unit for converting the voltage according to the amount of dust inside, an input setting unit for setting the input of the fan motor, a calculation unit for performing a comparison calculation of the outputs of the detection voltage conversion unit and the input setting unit, and the calculation A dust detection device for an electric vacuum cleaner, comprising: a fan motor control unit that controls a fan motor according to a signal from the control unit; and a display control unit that controls a display unit according to a signal from the calculation unit.