JPS6058846B2 - vacuum cleaner - Google Patents

Description

[Detailed description of the invention] The present invention relates to a vacuum cleaner.

Generally, when it comes to vacuum cleaners, if the load on the electric blower increases due to an increase in the amount of dust collected or a shift from floor cleaning to shoe tongue cleaning, etc., the dust collection power decreases, so it is necessary to increase the input to the electric blower. be. Therefore, the input of the electric blower is controlled by a control circuit that includes a power control element such as a triax, but conventionally, a manual regulator using a variable resistor connected to this control circuit was attached to the handle of the vacuum cleaner itself. The input power to the electric blower is increased or decreased by changing the resistance by this manual regulator. Therefore, in the case of this conventional method, manual adjustment is required, and the operation must be performed by returning to the cleaner body, which is troublesome and does not allow efficient cleaning. Furthermore, since it is possible to drive the electric blower even if the filter unit is forgotten to be attached, there are many accidents in which the electric blower is damaged due to dust due to carelessness.
The present invention has been made in view of the above points, and it is possible to automatically control the input of an electric blower according to load fluctuations.
It is an object of the present invention to provide a vacuum cleaner that can improve cleaning efficiency and protect an electric blower from dust.

In the present invention, when the load fluctuates, the air volume in the dust collection intake air passage changes, and the actuating body is moved accordingly to change the magnetic flux density using a magnetic sensing element placed opposite the magnetic source. By detecting this and controlling the control circuit for the electric blower based on the amount of change in magnetic flux density caused by this magnetically sensitive element, it is possible to automatically control the input of the electric blower to an appropriate value in accordance with load fluctuations, and furthermore, By providing a magnetic source in the filter unit, when the filter unit is forgotten to be attached, the output of the magnetic sensing element is set to zero and the electric blower is automatically stopped, thereby preventing failure of the electric blower due to dust. It is configured so that it can be done.

An embodiment of the present invention will be described based on the drawings.

First, FIGS. 1 and 2 schematically show a vacuum cleaner, in which an electric vacuum cleaner 1 and a dust case 2 are divided into two parts. Here, a locking hole 3 and a fixed locking part 4 are formed on the upper and lower front surfaces of the electric case 1, and a clamp 5 and a fixed locking part (not shown) are formed on the rear side of the dust case 2 correspondingly. (2) are provided, and both are removably connected. An electric blower 7 having a fan cover 6 is supported by support rubber 8 and the like and is built into the electric case 1, and the front side is a bag guard plate 10 in which a plurality of air intake holes 9 are formed. Further, the inside of the dust case 2 is a dust collection chamber (not shown) communicating with the suction port 11, and a filter unit 12 is removably inserted in the rear part thereof. As a result, when the electric case 1 and the dust case 2 are combined, the electric blower 7 suctions the dust from the suction port 11 to the dust collection chamber and the filter unit 12.
A dust collecting air intake air passage 13 is formed which passes through the bag guard plate 1-0 and heads toward the exhaust side via the air intake hole 9 of the bag guard plate 1-0. The filter unit 12 has a rectangular cylindrical filter frame 14 in which a pre-filter 15, a polyurethane filter 16, and a filter 17 formed by folding a dense mesh paper material in a zigzag shape are sequentially attached to the filter frame 14. is filter 1
A plurality of shape-retaining ribs 18 that are located between the gaps of the filter 17 and define the shape of the filter 17, and a backing 19 that is bonded to the inner surface of the dust case 2 are provided. Further, a dust removing body 20 for removing dust from the filter 17 is rotatably attached to a partition plate 21 on the exhaust side of the dust case 2. Next, as shown in FIG.
It is attached by 4.

A movable plate 26, which serves as an actuating body, is provided on the front side of the fixed plate 23 and is rotatable about a fulcrum 25. I'm being kicked. A magnetic source 27 such as a permanent magnet and a magnetic sensing element 28 are attached to the movable plate 26 and the rib 18 of the filter frame 14 so as to face each other.

In addition, this movable plate 26 has a compression/compression spring 2 with respect to the fixed plate 23.
A stopper piece 30 is formed near the fulcrum 25 and is biased in the direction of separation by the fulcrum 9 to restrict the amount of expansion. The force of this compression spring 29 is adjusted by an adjustment screw 31. A lid 32 is detachably attached to the locking hole 33 of the bag guard plate 10 so as to cover the fixed plate 23 and the movable plate 26. An inlet 34 is formed in the lid 32 so as to face the air intake hole 22, and a filter 35 is attached to the inlet 34 to prevent dust from adhering to the magnetic perturbation element 28 and the like. . As a result, a bypass air path 36 is formed in which the air intake flow passes through the filter 35 of the inlet 34, escapes through the air intake hole 22, and joins together by using a part of the lower end of the dust collecting air intake air path 13.
Further, an adjustment hole 37 is formed in the lid body 32 so as to face the adjustment screw 31, and is normally closed by a removable stopper 38 to prevent dust from flowing into the interior of the lid body 32. Next, a control circuit for the electric blower 7 is shown in FIG.

First of all, basically the cord reel 3 is connected to an AC power source.
9, the electric blower 7 and a power control element, such as a triax 41, are connected in series via a fuse 40, and capacitors Cl, C2, and C3 for noise prevention are connected to the cord reel 39 side. A primary winding 43 of a transformer 42 is also connected thereto. A hand switch 45 insulated from the AC power source is connected to the secondary winding 44 of the transformer 42 via the wiring inside the suction hose, and
A full wave rectifier circuit 46 is connected. A constant voltage circuit 49 is connected to the output side of the full-wave rectifier circuit 46, which mainly includes a transistor 47, a Zener diode 48, a resistor R1, and a smoothing capacitor C. The output side of this constant voltage circuit 49 includes a light emitting diode D1 and a resistor R2.
, transistor 50 are connected. Further, the triax 41 is connected to a series protection circuit that absorbs surges caused by a resistor R3 and a capacitor C5. A trigger element 51 such as a diac is connected to the gate of this triac 41, and a light receiving element R6 such as semi-fixed resistors R4, R5 and CdS is connected to the other end of this trigger element 51.
, a trigger circuit including a capacitor C6 is connected.
Here, the resistance value of the light-receiving element R6 is variable according to the amount of light received from the light-emitting diode D1, and it is configured as a single package with the light-emitting diode D1, but it is designed to prevent light leakage. If it is, it may be a combination of single units. Furthermore, resistors R7 and R8 are installed before these.
, a hysteresis correction circuit including a capacitor C7 is connected. The magnetically sensitive element 28 is also connected to the constant voltage circuit 49, and an 0P amplifier 52 is provided to which the amount of change in magnetic flux density detected by the magnetically sensitive element 28 is input as an electrical signal. .

By applying the output of this 0P amplifier 52 to the transistor 50 via the variable resistor R9 and the diode D2,
The light emitting diode D1 is driven with the amount of light emitted according to the output. In such a configuration, the movable plate 26 supporting the magnetic sensing element 28 is pushed by the compression spring 29 and regulated by the stopper piece 30, so that the initial state of the magnetic flux density received from the magnetic source 27 is set. Therefore, when the remote control switch 45 at the hand of the suction hose is set to 0N, the tri-attack 41 is triggered by the trigger element 51 while being regulated by the resistance value of the light receiving element R6 corresponding to the light emitting diode D1 corresponding to the initial state. Input control of the electric blower 7 is performed. Therefore, when the amount of air passing through the dust collection intake air path 13 increases as the load fluctuates, the amount of air passing through the bypass air path 36 also increases, and the movable plate 26 is fixed against the compression spring 29. Board 23
It will move to the side.

As a result, the magnetically sensitive element 28 is moved further away from the magnetic source 27 than in the initial state, and the magnetic flux density received from the magnetic source 27 decreases as the displacement of the movable plate 26 increases. In this way, the amount of change in the magnetic flux density detected by the magnetic sensing element 28 due to the change in air volume appears as a change in the amount of light emitted from the light emitting diode D1 via the 0P amplifier 52 and the transistor 50, and thereby the light receiving element R6 The resistance value of is varied, the conduction phase angle of the triax 41 is changed from the initial state, and the input to the electric blower 7 is reduced. Conversely, as the displacement of the movable plate 26 becomes smaller, the input to the electric blower 7 increases. In this way, during cleaning, the input to the electric blower 7 is automatically adjusted based on the magnetic sensing element 28 according to the degree of load, so cleaning efficiency can be improved without any troublesome operations. I can do it. In other words, when the load increases due to cleaning etc., the electric blower 7
It is possible to increase the input to the electric blower 7, or to decrease the input to the electric blower 7 when the load is light, such as when cleaning a wooden floor. Moreover, when the filter unit 12 is forgotten to be attached, there is no output from the magnetically sensitive element 28, and the electric blower 7 is stopped. Therefore, there is no possibility that the electric blower 7 will be damaged by dust. Here, the magnetic flux density of the magnetic sensing element 28 directly received from the magnetic source 27 is varied according to the amount of movement of the movable plate 26, and this movable plate 26 is connected to the lower end of the dust collection intake air passage 13. Since it is provided in the bypass air passage 36 located in a part,
When viewed from the entire dust-collecting intake air passage 13, the influence of the movable plate 26 and the like is small, so the provision of the movable plate 26 and the like does not reduce efficiency. In addition, the initial positions of the movable plate 26 and the magnetic perturbation element 28 and the spring pressure of the compression spring 29 can be adjusted using the adjusting screw 31, and variations in magnetic force can be canceled. In this case, when the electric case 1 and the dust case 2 are separated, the adjustment screw 31 is located at the front of the electric case 1 as shown in FIG. By inserting a screwdriver, adjustments can be easily made even after assembly. By the way, electric case 1
A light-emitting indicator 54 is provided on the upper part of the handle 53 as a dust meter. Therefore, the circuit shown in FIG. 6 uses the light-emitting indicator 54 as shown in FIG.
A circuit has been added for this purpose.

That is, the light-emitting indicator 54 is made up of, for example, five light-emitting diodes D3, D4, D5, D6, and D7 arranged in a row, and its light emission is controlled based on the output from the OP amplifier 52. Although this circuit will not be described in detail, the output from the 0P amplifier 52 is connected to the resistor R.
It is inputted to the amplifier 55 with l5 as a load and outputted via the transistor 56. The light emitting diodes D3, D4, D5, and D6 are each connected to a constant voltage circuit 5.
Comparison amplifiers 58, 59, 60, 61, 6 connected to 7
2. Driver transistors 63, 64, 65, 66
, 67, and comparison amplifiers 58, 59, 60, 61, 6
2, the output of the transistor 56 is connected to the resistor R2O,
It is input via R2l, R22, R23, and R24. However, in accordance with the amount of change in air volume detected by the magnetically sensitive element 28, the light-emitting indicator 54 causes the diode D3 to emit light, the diodes D3 and D4 to emit light,
The input of the electric blower 7 is indicated by the light emission of the diodes D3, D4, D5, etc. In this circuit, the resistors Rl2 and Rl3 are used to reduce the influence of the trigger circuit on the triac 41 side and the indicator 54 side on each other. Note that as a means for providing a magnetic source in the filter unit 12, a magnetized magnetic material may be mixed in the filter frame 14 and the backing 19.
The present invention is configured as described above, and detects changes in magnetic flux density by moving an actuating body equipped with a magnetically sensitive element facing a magnetic source in response to changes in the air volume in the i-dust intake air path. Therefore, it is possible to control the control circuit according to the amount of change in magnetic flux density using the magnetic sensing element, and thereby automatically control the input of the electric blower to an appropriate value according to load fluctuations. By providing a magnetic source in the filter unit, it is possible to automatically stop the electric blower when the filter unit is forgotten to be attached, thereby preventing malfunctions of the electric blower due to dust. It is effective.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is an exploded perspective view, Fig. 2 is a partially cutaway side view, Fig. 3 is a perspective view of the filter unit, and Fig. 4 shows the main parts. FIG. 5 is an enlarged vertical sectional side view, FIG. 5 is an enlarged horizontal sectional view of a part of the filter unit, FIG. 6 is a circuit diagram, and FIG. 7 is a circuit diagram showing a modified example. 7...Electric blower, 12...Filter unit, 1-3...Intake air duct for dust collection, 26...
...Movable plate (operating body), 27...Magnetic source, 2
8...Magnetic sensing element.

Claims (1)

[Claims] 1 In a vacuum cleaner body that has a built-in electric blower, filter unit, etc., the air volume is changed by being located in the dust collection intake air path between the electric blower and the filter unit whose input is controlled by a control circuit in the vacuum cleaner body. A magnetic source is provided in the filter unit, and the magnetic flux is continuously changed between the working body and the magnetic source according to the amount of movement of the working body. A vacuum cleaner characterized in that a magnetically sensitive element that outputs an electric signal for controlling a control circuit is fixed facing the magnetic source.