JPS6058968B2 - vacuum cleaner - Google Patents

Description

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

Technical background of the invention and its problems In general, in the case of vacuum cleaners, when 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. Electric blower input needs to be increased.

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;It is something that I have been controlling for a while. As such, in order to automatically control the input of the electric blower according to changes in the load, an actuating body is installed in the intake air passage for dust collection by the electric blower, and the actuator moves according to changes in air volume. Some devices control a control circuit by detecting changes in the amount of movement of the body using a converter.

However, such a device has a problem in that it is not possible to easily adjust variations in the input power of the electric blower. Purpose of the Invention 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 in a stable state according to load fluctuations, and to ensure proper performance. To provide a vacuum cleaner in which the input of an electric blower can be easily adjusted from the outside.

Summary of the Invention The present invention moves an actuating body according to the change in the air volume in the dust collection intake air passage when the load fluctuates, and detects the change in the amount of movement using a magnetically sensitive element. It is possible to control the control circuit and automatically control the input of the electric blower to an appropriate value according to load fluctuations, and also has an adjustment screw that adjusts the pressing force of the elastic body that biases the operating body. Adjustment screws are provided to adjust the stationary position gate of the actuating body, so it is easy to ensure proper performance.These adjustment screws are located on the coupling surface and exposed to the outside, so the adjustment is easy. It is designed to be easy to operate.

Embodiment of the Invention A first embodiment of the present invention will be described based on FIGS. 1 to 4. FIG.

First, FIGS. 1 and 2 schematically show a vacuum cleaner, in which a main body case 1 and a dust case 2 are divided into two parts. Here, a locking hole 3 and a fixed locking part 4 are formed at the top and bottom of the front surface of the main body 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), and both are removable. A fan cover 6 is provided inside the main body case 1.
A bag guard plate 10 is provided with an electric blower 7 supported by support rubber 8 and the like, and a plurality of air intake holes 9 formed on the front surface. In addition, the dust case 2
The interior thereof is a dust collection chamber (not shown) communicating with a suction port 11, and filter units 1 and 2 are removably inserted in the rear part of the chamber. As a result, when the main body 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 path 13 is formed which passes through the air intake hole 9 of the bag guard plate 10 and heads toward the exhaust side. FIG. 3 shows an enlarged view of the structure near the lower part of the bag guard plate 10, including the dust-collecting intake air passage 13.

First, a relief intake hole 14 equivalent to the intake hole 9 is formed, and
On the front side, a fixing plate 15 is attached with screws 16. Bag guard plate 1
It is attached to 0. A movable plate 18 is provided on the front side of the fixed plate 15 and is rotatable about a fulcrum 17, with its upper end facing the air intake hole 14. Here, the fixed plate 15 and the movable plate 1
8. includes a magnetic source 19 such as a permanent magnet and a magnetic sensing element 20.
are installed so that they are facing each other. Further, the movable plate 18 is provided between the support part 21 of the fixed plate 15, the adjustment screw 23 screwed into the screw hole 22 of the movable plate 18, and the integral receiving part 24. A stopper piece 26 is formed in the vicinity of the fulcrum 17, which is biased in the separation direction by a compression spring 25 as an elastic body and restricts the amount of expansion. A lid body 27 is detachably attached to the locking hole 28 of the bag guard plate 10 so as to cover the fixed plate 15 and the movable plate 18. This cover body 27 has a vent hole 14.
An inlet 29 is formed opposite to the inlet 29, and in order to prevent dust from adhering to the magnetically sensitive element 20, etc.,
A filter 30 is attached. As a result, the intake air flow is directed to the inlet 2 by using a part of the lower end of the intake air passage 13 for dust collection.
A bypass air passage 31 is formed which passes through the filter 30 of No. 9, escapes from the air intake hole 14, and joins together. Further, an adjustment hole 32 is formed in the cover body 27 so as to face the adjustment screw 23, and is normally closed by a detachable cover 33 to prevent dust from flowing into the interior of the cover body 27. moreover,
An adjustment screw 34 is attached to the lid body 27, the tip of which abuts against the movable plate 18, so as to adjust the initial position of the movable plate 18 which is being pushed in the direction of separation by the compression spring 25. 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.
5, an electric blower 7 and a power control element, such as a triax 37, are connected in series via a fuse 36, and capacitors Cl, C2, and C3 for noise prevention are connected to the cord reel 35 side. At the same time, the primary winding 39 of the transformer 38 is connected. A hand switch 41 insulated from the AC power source is connected to the secondary winding 40 of the transformer 38 via wiring inside the hose, and a full-wave rectifier circuit 42 is also connected thereto. This full wave rectifier circuit 4
On the output side of 2, there is a transistor 43 and a Zener diode 4.
4, a constant voltage circuit 45 including a resistor R1 and a smoothing capacitor C4 is connected. The output side of this constant voltage circuit 45 includes a light emitting diode D1, a resistor R2,
A transistor 46 is connected. Further, a series protection circuit is connected to the triax 37 to absorb surges and the like caused by a resistor R3 and a capacitor C5. A trigger element 47 such as a diagonal is connected to the gate of this triax 37, and a light receiving element R6 such as semi-fixed resistors R4, R5, CdS, etc. is connected to the other end of this trigger element 47.
A trigger circuit with capacitor C5 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 one 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, R8,
A hysteresis correction circuit using a capacitor C7 is connected. The magnetically sensitive element 20 is also connected to the constant voltage circuit 45, and an 0P amplifier 48 is provided to which the amount of change in magnetic flux density detected in the magnetically sensitive element 20 is inputted as an electrical signal. .

The output of this 0P amplifier 48 is given to the transistor 46 via the variable resistor R9 and the diode D2, so that
The light emitting diode D1 is driven with the amount of light emitted according to the output. In such a configuration, the movable plate 18 supporting the magnetic sensing element 20 is pushed by the compression spring 25 and regulated by the adjustment screw 34, so that the initial state of the magnetic flux density received from the magnetic source 19 is set.
Therefore, when the remote control switch 41 at the hand of the hose is turned on, the trigger element 47 triggers the triax 37 while being regulated by the resistance value of the light receiving element R6 according to the light emitting diode D1 corresponding to the initial state, and the electric blower 7 input controls are performed. Therefore, when the amount of air passing through the dust collection intake air passage 13 increases as the load fluctuates, the amount of air passing through the bypass air passage 31 also increases, and the movable plate 18 is fixed against the compression spring 25. It is movably displaced toward the plate 15 side.

As a result, the magnetically sensitive element 20 moves closer to the magnetic source 19 than in the initial state, and the magnetic flux density received from the magnetic source 19 increases in accordance with the displacement of the movable plate 18. In this way, the amount of change in the magnetic flux density detected by the magneto-magnetic element 20 due to the change in air volume is reduced by the 0P amplifier 48 and the transistor 4.
This appears as a change in the amount of light emitted by the light emitting diode D1 via the light emitting diode D1, which changes the resistance value of the light receiving element R6, makes the conduction phase angle of the triac 37 smaller than the initial state, and reduces the input to the electric blower 7. In this way, during cleaning, the input to the electric blower 7 is automatically adjusted based on the magnetic sensing element 20 according to the degree of load, so cleaning efficiency can be improved without any troublesome operations. I can do it. That is, when the load increases, such as by cleaning a carpet, the input to the electric blower 7 is increased, and when the load becomes lighter, such as when cleaning a wooden floor, the input to the electric blower 7 is controlled to decrease. Here, the magnetic flux density of the magnetically sensitive element 20 directly received from the magnetic source is varied according to the amount of movement of the movable plate 18. Since it is provided in the bypass air passage 31 arranged in the part, the influence of the movable plate 18 etc. is small from the perspective of the entire dust collection intake air passage 13.
Therefore, the provision of the movable plate 18 and the like does not reduce efficiency. Furthermore, the initial position of the movable plate 18, and therefore the magnetically sensitive element 20, and the spring pressure of the compression spring 25 can be adjusted using the adjustment screws 34, 23, and variations in magnetic force can be canceled. In this case, when the main body case 1 and the dust case 2 are separated, the adjusting screws 34 and 23 are located at the front of the main body case 1, as shown in FIG. By removing the lid 33 and inserting a screwdriver through the adjustment hole 32, adjustment work can be easily performed even after assembly. In any case, the range of change in the movable amount of the movable plate 18 is limited to the stopper piece 26 in the counterclockwise direction.
In other words, it is regulated by the adjusting screw 34, and the clockwise direction is within a certain range regulated by the receiving part 24, so that the above-mentioned automatic control operation is performed stably.

Further, due to such a restriction, the magnetic source 19 and the magnetic sensing element 20, and the movable plate 18 and the lid body 27 do not collide with each other, and damage to them can be prevented. By the way, the maximum human power usage range for a vacuum cleaner is around 500W, including performance improvements, and the minimum input power is reduced to a range that is completely unsuitable for cleaning, so if you lower the input power, the suction performance will reach a range that is completely unsuitable for cleaning, so it should be around 300W. It can be said that the value before and after is a valid input range setting value.

The area with the lowest input corresponds to floor cleaning, lace curtains, etc., and the necessary suction power can be obtained. Therefore, by setting the minimum input by adjusting the shape of the stopper piece 26 and the adjusting screw 34, it becomes possible to perform cleaning while maintaining the necessary input without reducing efficiency. On the other hand, if you use an electric blower that is designed to have a high input so as to take into account variations in input power and input reduction depending on the frequency region used, and use it at a lower point by adjustment, the upper limit range will be uniform and the performance will be higher than necessary. It doesn't go up too high. Therefore, since the upper limit direction of the movable plate 18 is limited by the receiving part 24 under adjustment of the adjustment screw 23, the movable plate 18 does not move with a stroke more than necessary, so the mechanical response is quick and smooth. control is carried out. Incidentally, a light-emitting indicator 50 is provided as a dust meter on the upper part of the handle 49 of the main body case 1. Therefore, the circuit shown in FIG. 4 is replaced by a circuit for the light-emitting indicator 50 as shown in FIG. It has been added.

That is, the light-emitting indicator 50 is made up of, for example, five light-emitting diodes D3, D49, D5, D6, and D7 arranged in a row, and its light emission is controlled based on the output from the OP amplifier 48. Although this circuit will not be described in detail, the output from the 0P amplifier 48 is connected to the resistor Rl.
5 is input to the amplifier 51 as a load, and the transistor 5
2. The light emitting diodes D3, D4, D5, and D6 are each connected to a constant voltage circuit 53.
comparison amplifiers 54, 55, 56, 57, 58 connected to
, driver transistors 59, 60, 61, 62
, 63, and comparison amplifiers 54, 55, 56, 57, 5
8, the output of the transistor 52 is connected to a resistor R2O,
It is input via R2l, R22, R23, and R24. Therefore, in accordance with the amount of change in air volume detected by the magneto-perturbation element 20, the light-emitting indicator 50 changes the state of the diode D3 emitting light, the diodes D3 and D4 emitting light, and the diodes D3, D4, D5 emitting light, etc. The input for the electric blower 7 will be displayed. In this circuit, the resistors Rl2 and Rl3 are used to reduce the mutual influence between the trigger circuit on the triac 37 side and the indicator 50 side. be. Next, a second embodiment of the present invention will be explained with reference to FIG.

The same parts as those shown in the previous embodiment are given the same reference numerals, and the explanation will be omitted. In this embodiment, a fixed plate 15, a movable plate 18,
That is, the magnetic source 19 and the magnetic sensing element 20 are arranged in reverse order. That is, in the embodiment described above, when the movable plate 18 moves as the air volume increases, the magnetic sensing element 20 approaches the magnetic source 19. , the input to the electric blower 7 is reduced, but in this embodiment, contrary to this, when the air volume increases, the movable plate 18 is moved to cause the magneto-dissonant element 20 to separate from the magnetic source 19. , the input to the electric blower 7 is controlled in an increasing direction, and when the air volume decreases, the input is decreased.According to the control method of this embodiment, the floor brush, etc. will not stick to the floor surface. When the movement of the floor brush becomes heavy, in other words, at this time, the air volume decreases, so the input to the electric blower decreases, and it is possible to control the running load so that it does not exceed a certain level. In the above embodiment as well, if the output of the magnetically sensitive element 20 is reversely connected in the circuit shown in FIG. The range of change in the movable amount is regulated by the receiving portion 24 and the adjusting screw 34, and can be adjusted by the adjusting screws 23 and 34. Next, a third embodiment of the present invention will be explained with reference to FIG.

In this embodiment, a magnetic source 19 and a magnetically sensitive element 20 are provided on a fixing plate 15 so as to face each other and are fixed in position.
The magnetic flux density between the movable plate 1 and the magnetically sensitive element 20
A shielding plate 64 is attached to the movable plate 18 so as to move forward and backward between the two so as to be changed according to the movement of the movable plate 8. According to this embodiment, the magnetically sensitive element 20 is not attached to the movable plate 18, and the magnetic flux density is varied open and closed by the shielding plate 64, so that wiring to the magnetically sensitive element 20 is easy and the movable plate The influence of the movement of 18 is also small. Incidentally, as a method for performing this indirectly, the magnetic source 19 and the magnetically sensitive element 20 are used.
are provided at completely separate locations, and the fulcrum 17 of the movable plate 18
The magnetic flux density between the two may be varied by a lever or the like connected to the two. Incidentally, the adjustment work can be performed in the same manner in this embodiment as well. That is, the magnetic source 19
Although the positional relationship between the shielding plate 64 and the magnetoresistive element 20 is fixed, the amount of advance of the shielding plate 64 may be adjusted via the movable plate 18. Further, a fourth embodiment of the present invention will be explained with reference to FIG.

This embodiment is provided with a manual adjustment mechanism for setting minimum and maximum limits on the input to the electric blower 7. For this reason, first, the dust collection intake air passage 1 on the upper side of the bag guard plate 10 is
3 is used as a bypass air passage 31, and an inlet 29 with a filter 30 is formed in the bag guard plate 10. The movable plate 18 is rotatably supported using the frame 65. Further, a screw 66 for regulating the initial position of the movable plate 18 is attached to the bag guard plate 10. In this state, the magnetically sensitive element 2
The maximum amplitude of the movable plate 18 is regulated by the compression spring 25, air volume, etc., taking into consideration the characteristics of 0, etc., and the input is automatically controlled within this range as in the embodiment described above. Therefore, the regulating pieces 67 and 68 that further limit the minimum and maximum values of the regulated movable amount of the movable plate 18 are
They are arranged opposite to each other with 8 in between, and are rotatable about a fulcrum 70 by a lever 69.

Here, the regulating pieces 67 and 68 are arranged so that the movable plate 18
When located at an intermediate position between 7 and 68, the movable plate 18 is spaced apart so as not to restrict the free control range of the movable plate 18. and,
The lever 69 is connected to a slidable rack 71, and an adjustment knob 73 having a gear 72 that meshes with the rack 71 is provided protruding from the handle 49. In such a configuration, the movable plate 18 is connected to the regulating pieces 67 and 68.
When located at an intermediate position, the regulating pieces 67 and 68 do not affect the movement of the movable plate 18, resulting in automatic control.

By turning the adjustment knob 73, the gear 72
If the lever 69 is rotated counterclockwise via the rack 71, the counterclockwise movement of the movable plate 18 is regulated by the restriction piece 68, and if the lever 69 is rotated clockwise. , the clockwise movement of the movable plate 18 is controlled by the regulating piece 67.
It will be regulated by That is, the movable plate 18 has a fixed upper limit set by itself, but when using the regulating piece 68, the regulation is adjusted from a fixed lower limit to the upper limit regulating by the regulating piece 68, and when using the regulating piece 67, this regulation is adjusted. It is adjusted from the lower limit regulated by the piece 67 to its own fixed upper limit. The amount of proximity of the magnetically sensitive element 20 to the magnetic source 19 is also adjusted accordingly, and the input of the electric blower 7 controlled based on the magnetically sensitive element 20 is also limited in its minimum or maximum human power. Therefore, according to this embodiment, automatic control can be performed as in the above-mentioned embodiment, but even if the load becomes large when cleaning curtains, etc., the electric blower 7 is not controlled. It is also possible to set and adjust the maximum value of the input to be smaller than usual, and it is possible to obtain a control state according to cleaning. Effects of the Invention The present invention, as described above, uses an adjustment screw to adjust the movable range and the amount of movement of the actuating body that moves according to the change in air volume in the dust collection intake air passage. is possible,
This allows you to freely select the automatic control range of the input of the electric blower and obtain the performance of the electric blower that suits your application, making it easy to handle variations in the input of the electric blower or input reduction depending on the frequency region of use. can be adjusted to,
Appropriate performance can be ensured without the electric blower not rotating due to a drop in input or excessive input. Furthermore, since the adjustment screw is exposed to the outside on the surface that connects to the dust case, the drive It is possible to make adjustments while doing so.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing the first embodiment of the present invention;
The figure shows a side view with a part cut away, Fig. 3 is a vertical side view showing an enlarged main part, Fig. 4 is a circuit diagram, Fig. 5 is a circuit diagram showing a modified example, and Fig. 6 is FIG. 7 is a longitudinal side view showing a second embodiment of the invention, FIG. 7 is a longitudinal side view showing a third embodiment of the invention, and FIG. 8 is a longitudinal side view showing a fourth embodiment of the invention. It is. 7... Electric blower, 13... Intake air duct for dust collection, 18
... Movable plate (operating body), 20... Magnetic sensing element (converting body), 23... Adjustment screw, 24... Receiving part, 26
...stopper piece, 34...adjustment screw, 66...
Screws, 67-68...Regulation piece.

Claims (1)

[Claims] 1. An electric blower whose input is controlled by a control circuit is placed inside the main case to which a dust case is detachably attached, an actuating body that moves according to changes in the air volume in the intake air passage for dust collection by this electric blower, and a magnetic a magnetic sensing element that is provided opposite to the magnetic source and outputs a magnetic signal that changes continuously due to changes in magnetic flux generated in accordance with the amount of movement of the actuating body and controls the control circuit; An elastic body is provided for biasing the actuating body in the windward direction of the dust collection intake air passage, and an adjustment screw is provided for adjusting the pressing force of the elastic body, and an adjustment screw is for adjusting the rest position of the actuating body in a free state. is attached to a connecting surface of the main body case to which the dust case is attached so as to be exposed to the outside.