JPS6058847B2 - 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 to the electric blower can be increased or decreased by changing the resistance using a manual regulator, or by installing a variable resistor or the like in the air path to detect changes in air volume or negative pressure. It is something that exists.
Therefore, in this conventional method, in the former case, manual adjustment is required, and the operation must be performed by returning to the cleaner body, which is troublesome and cannot be performed efficiently. In the latter case, dust may adhere to the resistor, or
There were problems with reliability due to wear. The present invention was made in view of the above points, and is capable of automatically and continuously controlling the input of an electric blower according to load fluctuations.
The object is to obtain a vacuum cleaner that can improve cleaning efficiency.

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 magnetic sensing element, it is possible to automatically and continuously control the input of the electric blower to an appropriate value in response to load fluctuations. It is configured as follows.

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

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 the suction port 11, and a filter unit 12 is 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 sucks the dust from the suction port 11, passes through the dust collection chamber, the filter unit 12, and passes through the air intake hole 9 of the bag guard plate 10 to the exhaust side. An air intake air passage 13 for dust collection is formed. FIG. 3 shows an enlarged view of the structure near the bottom of the bag card board 10, including the dust-collecting intake air passage 13.

First, a relief intake hole 14 equivalent to the intake hole 9 is formed, and a fixing plate 15 is attached to the counterbore guard plate 10 with screws 16 on the front side. 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. 18 includes a magnetic source 19 such as a permanent magnet and a magnetic sensing element 2.
0 are attached so that they face each other. Moreover, this movable plate 18 is provided with a compression spring provided between a support part 21 of the fixed plate 15, an adjustment screw 23 screwed into a screw hole 22 of the movable plate 18, and a receiving part 24 integral with the fixed plate 15. 25
A stopper piece 26 is formed in the vicinity of the fulcrum 17 to be biased in the direction of separation and to restrict the amount of expansion. Then, a lid body 27 is installed to cover these fixed plates 15 and movable plates 18.
is detachably attached to the locking hole 28 of the bag guard plate 10. An inlet 29 is formed in the lid 27 to face the air intake hole 14, and a filter 30 is attached to the inlet 29 to prevent dust from adhering to the magnetically sensitive element 20 and the like. As a result, a bypass air path 31 is formed by using a part of the lower end of the dust collecting air intake air path 13, through which the air flow passes through the filter 30 of the inlet 29, escapes through the air intake hole 14, and joins. Further, an adjustment hole 32 is formed in the lid body 27 so as to face the adjustment screw 23, and is normally closed by a detachable lid 33 to prevent dust from flowing into the interior of the lid body 27. Further, an adjustment screw 34 is attached to the lid body 27, the tip of which touches the movable plate 18 in order 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, the electric blower 7 and a power control element, such as a triax 37, are connected in series through a fuse 36, and capacitors Cl, C2, and C3 for noise prevention are connected to the cord reel 35 side. At the same time,
A primary winding 39 of a transformer 38 is connected. A hand switch 41 insulated from the AC power source is connected to the secondary winding 40 of this transformer 38 via wiring inside the hose, and
A full wave rectifier circuit 42 is connected. A constant voltage circuit 45 is connected to the output side of the full-wave rectifier circuit 42, which mainly includes a transistor 43 and a Zener diode 44, as well as a resistor R1 and a smoothing capacitor C4. The output side of this constant voltage circuit 45 includes a light emitting diode D1 and a resistor R2.
, transistor 46 are connected. Further, a series protection circuit is connected to the triax 37 to absorb surges caused by a resistor R3 and a capacitor C5. A trigger element 47 such as a diac is connected to the gate of this triac 37, and the other end of this trigger element 47 includes semi-fixed resistors R4, R5, a light receiving element R6 such as CdS,
A trigger circuit with 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 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, R6,
A hysteresis correction circuit using a capacitor C7 is connected. The constant voltage circuit 45 is also connected to the magnetically sensitive element 20, and is provided with an 0P amplifier 48 to which the amount of change in magnetic flux density detected in the magnetically sensitive element 20 is inputted as an electrical signal. There is.

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 this configuration, the movable plate 18 supporting the magnetically sensitive element 20 is pushed by the compression spring 25 and regulated by the adjusting screw 34, so that the magnetic source 1
The initial state of the magnetic flux density received from 9 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 path 13 increases due to load fluctuations, the amount of air passing through the bypass air path 31 also increases, causing the movable plate 18 to resist the compression spring 25 and move against the fixed plate. This results in a movable displacement to the 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. Further, the initial position of the movable plate 18, and therefore the magnetically sensitive element 20, and the spring pressure caused by the compression spring 25 can be adjusted using the adjustment screws 34 and 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. By the way, on the upper part of the handle 49 of the main body case 1, there is a light-emitting indicator 5 as a dust meter.
Therefore, the circuit shown in FIG. 4 is supplemented with a circuit for a light-emitting indicator 50 as shown in FIG.

That is, the light-emitting indicator 50 includes, for example, five light-emitting diodes D3, D4, D5, 6 . It is formed by arranging D7 in a line, 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 Rl5.
is input to the amplifier 51 as a load, and the transistor 52
This is what is output via. The light emitting diodes D3, D4, D5, D6 are connected to the constant voltage circuit 53, respectively, through comparison amplifiers 54, 55, 56, 57, 58,
Driver transistors 59, 60, 61, 62,
63, comparison amplifiers 54, 55, 56, 57, 5
8, the output of the transistor 52 is connected to the resistors R9 and R, respectively.
2l, R2. , R23. This is input via R24. Therefore, in accordance with the amount of change in air volume detected by the magnetoresistive element 20, the light-emitting indicator 50 causes the diode D3 to emit light, the diodes D3 and D4 to emit light, and the diodes D3, D4, and D5 to emit light, etc. In this state, 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. 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, the fixed plate 15 and the 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 magnetically sensitive element 20 approaches the magnetic source 19 to reduce the input to the electric blower 7, but in this embodiment, On the contrary, by moving the movable plate 18 when the air volume increases, the magnetic sensing element 20 moves away from the magnetic source 19, and the input to the electric blower 7 is controlled in the increasing direction, and when the air volume decreases, the input is decreased. It was designed so that According to the control method of this embodiment, when the floor brush etc. stick to the floor surface and 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. This makes it 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. 4, a control system like that of this embodiment can be achieved. Next, a third embodiment of the present invention will be explained with reference to FIG.

In this embodiment, a magnetic source 19 and a magnetic sensing element 2 are mounted on a fixed plate 15.
The movable plate 18
A shielding plate 64 is attached to the movable plate 18 so that the shielding plate 64 moves forward and backward between the two so as to be changed according to the movement of the movable plate 18. According to this embodiment, the magneto-sensing element 20 is not attached to the movable plate 18, and the magnetic flux density is indirectly varied by the shielding plate 64, so that wiring to the magnetic-sensing element 20 is easy and 1
There is little influence from the movement of 8. In addition, as a method to do this indirectly, there is a magnetic method. Air source 19 and magnetic sensing element 20
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. In other words, magnetism. - Although the positional relationship between the source 19 and the magnetically sensitive 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.

In this embodiment, a manual adjustment mechanism is provided to set minimum, limit, and maximum limits on the input to the electric blower 7. For this reason, first, a part of the dust collection intake air passage 13 on the upper side of the bag guard plate 10 is used as a bypass air passage 31, and the inlet 29 with the filter 30 is connected to the bag guard plate 10.
is formed. The movable plate 18 is rotatably supported using the frame 65. Further, the screw 66 that regulates the initial position of the movable plate 18 is attached to the bag guard plate 10.
installed on. In this state, the maximum amplitude of the movable plate 18 is regulated by the compression spring 25, the air volume, etc. in consideration of the characteristics of the magnetically sensitive element 20, and the input is automatically controlled within this range as in the embodiment described above. be done. Thus, 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 arranged facing each other with the movable plate 18 in between, and are moved to the fulcrum 70 by a lever 69.
It is rotatable around the center.

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 proximity of the magnetosensing element 20 to the magnetic source 19 is adjusted accordingly, and the minimum or maximum input power of the electric blower 7 controlled based on the magnetically sensitive element 20 is limited. 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. As described above, the present invention provides an actuating body that moves in accordance with the change in the air volume in the dust collection intake air passage, and changes the magnetic flux density directly or indirectly in accordance with the amount of movement of this actuating body. A magnetic source and a magnetic sensitive element are placed facing each other, and the input of the electric blower is controlled via a control circuit based on the amount of change in magnetic flux density detected by the magnetic sensitive element. The input of the electric blower can be controlled automatically and continuously according to the air flow, and the cleaning efficiency can be improved under the simple detection mechanism without manual operation, and the detection mechanism is also magnetic. Since it is a non-contact type with fast response and magnetic detection, even if there is dust mixed in between the magnetic source and the magnetic sensing element, the detected value will not be affected, and the amount of change in air volume can be varied. Compared to conventional sensors that use resistors for detection, there are no sliding parts that can wear out, so reliability can be improved.

[Brief explanation of the drawing]

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. 8 is a longitudinal side view showing a fourth embodiment of the invention. be. 7...Electric blower, 13...Intake air passage for dust collection, 18...Movable plate (operating body), 19...
...magnetic source, 20...magnetic sensing element.

Claims (1)

[Scope of Claims] 1. An electric blower whose input is controlled by a control circuit, a movable body that moves according to changes in air volume in an intake air passage for dust collection by the electric blower, a magnetic source, and the magnetic source. A vacuum cleaner is provided with a magnetically sensitive element that outputs an electrical signal that continuously changes due to changes in magnetic flux density, which is placed facing the
The output of the magnetically sensitive element is continuously controlled by changing the gap between the magnetic source and the magnetically sensitive element by moving the operating body, or by changing the amount of magnetic shielding between the magnetic source and the magnetically sensitive element. , and the input of the electric blower is controlled via the control circuit based on the output. 2. The vacuum cleaner according to claim 1, wherein the lower limit of the range of change in the movable amount of the operating body is set to the minimum input. 3. The vacuum cleaner according to claim 1, wherein the upper limit of the range of change in the movable amount of the operating body is set to the maximum input.