JPH0230683B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an input control device for a vacuum cleaner, and more particularly to an input control device having a structure suitable for controlling input to a motor that rotates a fan in response to clogging of a filter. be.

Conventionally, in vacuum cleaners, it has been proposed to detect the air volume and control the input of the motor that rotates the fan, but as a means of detecting the air volume, there is no suitable method in terms of size, accuracy, reliability, etc. There is no such thing, and it has not been put into practical use to this day.

The present invention has been made in view of the above, and its purpose is to control the input of the motor that rotates the fan according to the clogging of the filter without directly detecting the air volume. The purpose of the present invention is to provide an input control device for a vacuum cleaner.

The above object of the present invention includes a fan, a motor for rotating the fan, and a filter provided between a part that houses the motor and the fan, and a part that houses dust sucked from a suction body. An input control device for controlling input to the motor of a vacuum cleaner, comprising: a pressure sensor for detecting negative pressure in a ventilation path between the fan and the filter; and a sensor for detecting an applied voltage or an inflow current to the motor. means for producing a control signal that increases in proportion to the output signal of the pressure sensor and decreases in proportion to the output signal of the detection means; and an input for the motor based on the control signal. This can be achieved by providing a control means for controlling the.

Hereinafter, the operating principle of the present invention will be explained in detail using FIGS. 1 to 4.

First, as shown in FIG. 1, the negative pressure in the ventilation passage between the fan and the filter placed in front of the fan has a linear relationship with the air volume. and,
The relationship differs depending on the voltage applied to the motor that rotates the fan, and if the voltages are V ₁ , V ₂ , and V ₃ and the relationship is V ₁ < V ₂ < V ₃ , then l and m, respectively. , n.

Next, regarding the relationship between the above negative pressure and the voltage applied to the motor, as shown in FIG. 2, as the applied voltage increases, the negative pressure increases linearly.

When the applied voltage is constant, the negative pressure decreases almost linearly as the air volume increases, but if the air volume decreases due to filter clogging, the increase in negative pressure is detected and feedback is applied. When the voltage applied to the motor is increased, the air volume increases and the negative pressure also increases.In this case, the relationship between the negative pressure and the air volume is, for example, initially the relationship l in Figure 1. The relationship is m. As a result, the increase in negative pressure is detected again and fed back, causing the applied voltage to increase further and eventually becoming uncontrollable. Therefore, the voltage applied to the motor is also detected in addition to the negative pressure. Air volume Q is the applied voltage of the motor
As V _M increases, it increases linearly, so Q∝V _M ...(1). Also, as the negative pressure H between the fan and the filter increases, the air volume Q decreases linearly, so Q∝-H...(2). Therefore, Q=K ₁ V _M −K ₂ H ...(3) holds true.

Also, the relationship between filter clogging F and negative pressure H is as follows:
As shown in FIG. 3, since it changes linearly with the motor applied voltage _VM as a parameter, it can be expressed as H=K _{3 VM} + K ₄ F (4).

On the other hand, the relationship between filter clogging F and air volume Q is as follows:
As shown in FIG. 4, since it changes linearly with the applied voltage _VM as a parameter, it is expressed as Q=K _{5 VM} −K ₆ F (5).

If the filter is clogged, the air volume Q will decrease, so in order to increase the air volume,
The voltage applied to the motor must be increased in proportion to the reduction in air volume. To do this, the voltage V _M ' newly applied to the motor may be set to a value expressed by the following equation.

V _M ′=V _M0 −K ₇ Q (6) where, V _M0 ; reference voltage In equations (3) to (6), K ₁ to K ₇ are constants.

Substituting equation (3) into equation (6), we get V _M ′=V _M0 −K ₁ K ₇ V _M +K ₂ K ₇ H ……(7). Therefore, from equation (7), if negative pressure H and applied voltage V are detected and fed back, the control will be similar to equation (6), and the same as input control according to changes in air volume. It can be seen that input control is possible.

Furthermore, by substituting equation (4) into equation (7) and rearranging, V _M ′=V _M0 + (K ₂ K ₄ K ₇ −K ₁ K ₇ ) V _M +K ₂ K ₄ K ₇ F
...(8) becomes. Here, if K ₂ K ₄ = K ₁ ...(9), then V _M ′ = V _M0 + K ₂ K ₄ K ₇ F ...(10), and regardless of the voltage applied to the motor, the filter eye It can be seen that input control according to the blockage becomes possible.

In this way, by detecting the motor applied voltage V _M and the negative pressure H between the fan and the filter, and using the above relational expression to control the motor applied voltage as if by obtaining a signal for the air volume Q, the filter Enables input control according to clogging.

EMBODIMENT OF THE INVENTION Hereinafter, this invention will be specifically demonstrated based on Example drawing.

5 and 6 show an embodiment of the present invention. FIG. 7 shows another embodiment of the invention.

In FIG. 5, the main body 1 of the vacuum cleaner has a main body case part 1a that constitutes a part that houses a fan 2 and a motor 3 that rotates the fan 2.
and a dust case portion 1b that constitutes a portion for storing the garbage 4.

A suction hose 5 is connected to the dust case portion 1b. A suction body 6 is attached to the tip of the suction hose 5.

The filter 7 is connected to the motor 3 as shown in FIG.
It is located in front of the fan 2 and between the part that accommodates the fan 2 and the part that accommodates the garbage 4. The pressure sensor 8 detects negative pressure in the ventilation passage 9 between the filter 7 and the fan 2 (differential pressure between the pressure in the ventilation passage 9 and atmospheric pressure), and is provided in the main body 1 of the vacuum cleaner. .

FIG. 6 shows a circuit diagram of the input control device 10 for a vacuum cleaner. In Figure 6, 11 is a power supply, 12
is a capacitor, 13 is a resistor, these are power supply 1
1 and connected in series with capacitor 1
Triac 14 is connected to the series circuit of 2 and resistor 13.
are connected in parallel. 15 is triack 14
This is a diac connected between the gate terminal of the capacitor 12 and the connection point a of the capacitor 12 and the resistor 13. A resistor 16, diodes 17 to 20, and a transistor 21 are connected to both ends a and b of the resistor 13 as shown in the figure, and the base of the transistor 21 is
It is connected via a resistor 22 to the output terminal of an operational amplifier 24, which has a resistor 23 connected between the inverting input terminal and the output terminal. The output voltage of the pressure sensor 8 is input to the non-inverting input terminal of the operational amplifier 24 via the resistor 25.

The primary side of the transformer 26 is further connected to both ends of the motor 3, and the secondary side of the transformer 26 is connected to the
The g and i terminals of a diode bridge consisting of diodes 27 to 30 are connected, and the DC voltage generated between f and h of the diode bridge is applied to a resistor 31.
The signal is input to the inverting input terminal of the operational amplifier 24 via the inverting input terminal of the operational amplifier 24. 32 is a capacitor connected between f and h of the diode bridge. Note that the non-inverting input terminal of the operational amplifier 24 is grounded via a resistor 33, and further connected via a resistor 34 to a battery that generates the reference voltage _VR .

The means for detecting the voltage applied to the motor 3 is constituted by an electrical component surrounded by a dashed line 100 in FIG. That is, in this embodiment, the detection means 100 is composed of a transformer 26, diodes 27 to 30, and a capacitor 32.

A generating means for generating a control signal which increases in proportion to the output signal of the pressure sensor 8 and decreases in proportion to the output signal of the detection means 100 is indicated by the dashed line 200 in FIG. Consists of electrical components surrounded by That is,
In this embodiment, the generating means 200 includes a battery, an operational amplifier 24, resistors 23, 24, and a battery for generating the reference voltage _VR .
It consists of 31, 33, and 34.

The control means for controlling the input of the motor 3 based on the control signal from the generation means 200 is a sixth
In the figure, it is constituted by electrical parts surrounded by a dashed line 300. That is, the control means 300 controls the capacitor 12, the triax 1
4, a diode 15, resistors 13 and 16, diodes 17 to 20, and a transistor 21.

In the input control device described above, the output voltage of the pressure sensor 8 increases linearly as the negative pressure increases, and this voltage is applied to the non-inverting input terminal of the operational amplifier 24. On the other hand, tryack 1 is applied to motor 3.
The alternating current voltage that is tapped and applied by the amplifier 4 is applied as a direct current voltage to the opposite input terminal of the operational amplifier 24 via the transformer 26, the diodes 27 to 30, and the capacitor 32. Now, the output voltage of the pressure sensor 8 is _VH , the DC voltage from the capacitor 32 proportional to the motor applied voltage is _Vv ,
Furthermore, if the resistance values of the resistors 31, 25, and 34 are R ₅ , R ₆ , and R ₈ , and R ₈ , R ₅ , and R ₆ are respectively, then the output voltage V ₀ of the operational amplifier 24 is V ₀ =R ₆・R ₇ /R ₅・R ₈・R ₃ +R ₅ /R ₆ +R ₇ V _R +R ₆ /R ₅ R ₃ +R ₅
/R ₆ +R ₇ V _H −R ₃ /R ₅ V _V Here, R ₃ and R ₇ are the resistance values of resistors 23 and 33, respectively. V _R is the reference voltage. This corresponds to the relational expression (7) between the motor applied voltage V _M and the negative pressure H between the filter 7 and the fan 2. From the relationship between equations (3) and (10), the output voltage V ₀ of the operational amplifier 24 is proportional to the air volume Q.
As V decreases, the output voltage V ₀ increases. This output voltage V ₀ is applied to the base terminal of a transistor 21 via a resistor 22, and a DC voltage obtained by full-wave rectification of an AC voltage by a bridge made up of diodes 17 to 20 is applied in the forward direction to the transistor 21. has been done.

On the other hand, the motor 3 is subjected to AC phase control by a triax 14 and a diax 15, and the firing angle of this AC phase control is determined by the magnitude of the current flowing into the capacitor 12.
The current flowing into the transistor 2 is determined by the base currents of the resistors 13 and 16 and the transistor 21. Therefore, the voltage applied to the motor 3 is
It is controlled by the output voltage V ₀ of 4. The air volume Q is
It decreases when the filter 7 becomes clogged. When the air volume Q decreases, the output voltage V ₀ of the operational amplifier 24 increases, so if the polarity is set as shown in equation (4),
When the filter 7 is clogged, the capacitor 12
The inflow current increases, the firing angle of the AC phase control decreases, and as a result, the voltage applied to the motor 3 increases, and the suction force of the vacuum cleaner increases.

According to the above-mentioned embodiment, instead of measuring the air volume that changes depending on the clogging of the filter 7, the negative pressure between the filter 7 and the fan 2 and the voltage applied to the motor 3 are detected. Since a signal corresponding to the air volume is obtained from the signal and the motor 3 is controlled using this signal, input control of the vacuum cleaner can be easily performed.

In addition, in Fig. 1, the relationship between air volume and negative pressure is shown using the voltage applied to the motor as a parameter, but as shown in Fig. 7, the relationship between air volume and negative pressure is shown using the inflow current of the motor as a parameter. The same holds true when showing the relationship with pressure. In FIG. 7, o, p, and q are inflow currents I ₁ , I ₂ , and I ₃ , respectively, and I ₁ <I ₂ <I ₃
It is as follows. Therefore, filter 7 and fan 2
The negative pressure between the motor 3 and the current flowing into the motor 3 may be detected and used for input control, and the same effect can be achieved.

As explained above, according to the present invention, the output of the detection means increases in proportion to the output signal of the pressure sensor that detects the negative pressure between the filter and the fan, and the output of the detection means that detects the voltage applied to the motor or the inflow current. Since the motor input is controlled based on a control signal that decreases in proportion to the signal, it is easy to control the input of the motor that rotates the fan in response to filter clogging without directly detecting the air volume. Thus, there is provided an input control device for a vacuum cleaner that can be operated in a reliable manner.

[Brief explanation of drawings]

Figure 1 is a diagram showing the relationship between the negative pressure in the ventilation passage between the fan and the filter and the air volume when the applied voltage of the motor is taken as a parameter, and Figure 2 is the relationship diagram between the applied voltage and the above negative pressure. 3 is a relationship diagram between filter clogging and the above negative pressure when the voltage applied to the motor is used as a parameter, and FIG. A diagram showing the relationship between clogging and air volume, FIG. 5 is a structural diagram showing an embodiment of the vacuum cleaner to which the present invention is applied, and FIG. 6 is a circuit diagram showing an embodiment of the input control device of the present invention. FIG. 7 is for explaining another embodiment of the present invention, and is a relationship diagram between the air volume and the negative pressure when the inflow current of the motor is used as a parameter. 1...Main body of the voltage vacuum cleaner, 2...Fan, 3...
...Motor, 6...Suction body, 7...Filter, 8...
... Pressure sensor, 9 ... Ventilation path, 100 ... Detection means, 200 ... Creation means, 300 ... Control means.

Claims (1)

[Claims] 1 A fan, a motor that rotates this fan,
In an input control device for controlling an input to the motor of a vacuum cleaner, the input control device includes the motor and a filter provided between a part that stores the fan and a part that stores dust sucked from the suction body. a pressure sensor for detecting negative pressure in the ventilation passage between the fan and the filter; a detection means for detecting an applied voltage or an inflow current of the motor; A vacuum cleaner comprising: a generating means for generating a control signal that decreases in proportion to the output signal of the detecting means; and a controlling means for controlling the input of the motor based on the control signal. input control device.