JPS5949723A - Control apparatus of electric cleaner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a vacuum cleaner in which the suction air volume is controlled to be constant.

Configuration of conventional example and its problems Figure 1 shows the suction air volume detection configuration of a conventional vacuum cleaner, in which 1 is a wind plate provided in the ventilation path of the vacuum cleaner, and 2 is the air blast plate. A spring that controls the movement of 1,
Reference numeral 3 denotes a rotary variable resistor that is attached to the rotating shaft of the wind baffle plate 10 and configured to change its resistance value according to the deflection of the baffle plate 1. When the wind flows from the direction of V in the vacuum cleaner, the wind baffle plate 1 rotates to an angle where the force received by the wind and the back pressure exerted by the spring 2 are balanced and then stops. Here, the force received from the wind is proportional to the wind speed, and the wind speed is further proportional to the air volume.

That is, the force that the wind baffle 1 receives from the wind is proportional to the air volume inside the vacuum cleaner, and the stopping angle (hereinafter referred to as deflection angle) of the wind buff board 1 is an angle that is in a functional relationship with the wind volume. The rotary variable resistor 3 is used to detect the deflection angle of the wind plate 1, and its resistance value changes depending on the deflection angle of the wind plate 1. Therefore, by detecting the resistance value of the rotary variable resistor 3, the air volume can be detected. That is, the conventional vacuum cleaner attempts to control the suction air volume to a constant value by controlling the electric motor so that the resistance value of the rotary variable resistor 3 is constant. However, in the variable resistor 3 of the variable resistor type P, the sliding frictional resistance of the shaft is large, and therefore a large torque is required to drive the shaft. However, the wind receiving plate 1 of the conventional air flow rate detection means has a large shape in order to absorb the force received from the wind. 1. The torque received from the wind is small in response to minute changes in the wind profile, and when constant air flow control is performed without being able to detect it, problems such as hysteria in operation, variation in operation, and insensitive operation occur, causing control. It had the disadvantage that it could not be done accurately.

Purpose of the Invention The present invention eliminates the drawbacks of the prior art described in 11-1. By detecting the deflection angle of the wind deflection plate without contacting the wind deflection plate, the driving torque can be reduced, and high performance can be achieved. This makes it possible to control the wind travel...'.

Composition of the Invention The vacuum cleaner control device of the present invention includes a magnet interlocking with a wind baffle and a magnetic resistance element provided opposite to the magnet, and operates a control circuit by the output of the magnetic resistance element. The intake air volume is controlled to a set value.

Description of examples The embodiment will be explained below based on FIGS. 2 and 3.

In the figure, 1 and 2 are the same wind plate as in Fig. 1 and springs for its back pressure, 4 is a magnet that is attached to the rotating shaft of the wind plate 1 and moves in conjunction with it, and 5 is the magnet. installed opposite to 4,
A magnetoresistive element (hereinafter referred to as an MR element) detects the direction of the magnetic field generated by the magnet 4, 6 is an electric motor, 7 is a bidirectional three-terminal XIRISC that controls the electric motor 6, and 8 is the bidirectional +I゛ three-terminal. Gate control device for controlling the gate of Zyristor, R1-R9 are resistors, A1-A2
1I′i operational amplifier. In the above configuration, the wind receiving plate 1 forms an angle of deviation that has a fixed functional relationship with respect to the air volume, similar to the conventional example. Since the magnets 4 are placed on the rotating axis of the wind baffle plate 1 in some cases and move in conjunction with the baffle plate 1, the direction of the magnetic field created by the magnets 4 on the rotating axis is wind board 1
It also changes according to the deflection angle determined by the air volume.

The MR element has a resistance value that changes depending on the direction of the magnetic field generated by the magnet 4, and detects the direction of the magnetic field created by the magnet 4, and changes the resistance value according to the change in direction. be. In other words, there is a certain correlation between the resistance value of the MR element 5 and the air flow rate, and the air flow rate can be detected by detecting the resistance value of the MR element 5, and the resistance value of the MR element 6 is always equal to the set value. By controlling the electric motor 6, the suction air volume of the vacuum cleaner can be kept constant.

In FIG. 3, resistors R1 to R2 are for input setting of operational amplifier A1, and together with resistor R3 and operational amplifier A1, constitute a constant current source circuit between the output side and the negative input side of the operational amplifier. The resistors R6 to R9 and the operational amplifier A2 constitute a differential amplifier rl+, and this differential amplifier 113 outputs the set voltage value divided by the resistors R4 and R5, and the M
The output voltages of the R element 4 are compared, and the difference is increased and outputted. The gate control device 8 changes the gate trigger phase of the bidirectional three-terminal 7 according to the output of the operational amplifier A2, and controls the gate of the bidirectional three-terminal Zyrister 7 so that the output value of the operational amplifier A2 always becomes the set value. This is a gate control device configured to control the output of the electric motor 6 by controlling the gate of the bidirectional three-terminal Zyristor 7.
The output of element 5 is controlled to be constant. That is, by performing the above control, the suction air volume of the vacuum cleaner is always constant, and a vacuum cleaner with a constant suction air volume is realized.

Here, since the MR element 5 is spatially separated, it does not have any sliding frictional resistance unlike a conventional rotary variable resistor. Therefore, the movement of the wind receiving plate 1 is smooth, and it operates sensitively even to minute changes in wind speed, so that a high-performance air volume control device with high detection accuracy can be constructed. Furthermore, since the operating loss of the wind baffle plate 1 is small, it can be sufficiently immobile even with low torque, and the shape of the wind baffle plate can also be made smaller.

Effects of the Invention As described above, according to the present invention, it is possible to construct a vacuum cleaner control device that is highly sensitive to small airflows, is highly accurate, and is compact.

[Brief explanation of the drawing]

Fig. 1 shows a suction windage inspection part in a conventional vacuum cleaner, a is a side view, b is a front view, Fig. 2 is a suction air volume detection part in an embodiment of the present invention, d is a side view, b is a front view, and FIG. 3 is a circuit diagram. 1...Blow plate, 2...Spring, 4...
...Magnet, 5... Magnetoresistive element. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] A baffle plate is installed in the ventilation duct to detect the air volume,
a spring provided to apply a force in the direction opposite to the direction of the force received by the wind baffle plate to suppress the movement of the baffle plate; a magnet that moves in conjunction with the baffle plate; A control device for a vacuum cleaner, comprising magnetic resistance elements arranged to face each other, and a control circuit that controls the suction air volume of the vacuum cleaner to a set air volume based on the output of the magnetic resistance elements.