JPH0747014B2 - Vacuum cleaner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention relates to a manual operation of a hose in which the output of an electric blower for dust collection incorporated in a vacuum cleaner body is connected to the vacuum cleaner body. The present invention relates to an electric vacuum cleaner that can be switched and operated.

(Prior Art) A circuit inside a conventional vacuum cleaner body will be described with reference to FIG.

A commercial AC power supply 11 is connected in series with a triac 13 to which a snubber circuit 12 including a resistor and a capacitor is connected, and an electric blower 14. The electric blower 14 includes a noise prevention circuit 15 including a capacitor.

A primary winding of a step-down transformer 16 is connected to the commercial AC power supply 11, a rectifier circuit 17 is connected to the secondary winding of the transformer 16, and a resistor is provided on the output side of the rectifier circuit 17. A constant voltage circuit 18 including a Zener diode is connected.
A resistor 19 and a resistor 20 which are connected in series with the constant voltage circuit 18 in parallel are connected, and a gate of a programmable unijunction transistor (PUT) 21 is connected to a connection point of the resistor 19 and the resistor 20. The cathode of PUT 21 is connected to one end of the primary winding of transformer 22. Also,
A charging capacitor 23 is connected between the anode of the PUT 21 and the other end of the primary winding of the transformer 22. Further, the secondary winding of the transformer 22 is connected to a protection circuit 24 composed of a resistor and a diode, and is connected to the gate of the triac 13.

A blade receiver 26 is directly connected to the connection point between the constant voltage circuit 18 and the resistor 19 via the resistor 25, and a blade receiver 27 is directly connected to the anode of the PUT 21, and the blade receivers 26 and 27 are respectively connected to the pin 28 of the hose. , 29
Is detachably connected to the operation circuit 30 of the hose.

In this operation circuit 30, the variable sliding resistance 31 and the first conductor 32 are connected to the pin 28, and the second conductor 33 is connected to the pin 29. A first slider 34, a first conductor 32 and a second conductor 33 are provided between the sliding variable resistor 31 and the second conductor 33.
A second slider 35 that slides in conjunction with the first slider 34 is slidably connected between and.

Next, the operation of the circuit of this conventional vacuum cleaner will be described.

First, the pins 28 and 29 of the hose are connected to the blade supports 26 and 27, respectively. After that, the first slider 34 and the second slider 35 are slid to set the sliding variable resistor 31 to a resistance value corresponding to the output of the cleaner. When the resistance value of the sliding variable resistor 31 is increased, the PUT2 is turned on when the anode potential exceeds the gate voltage set by the resistors 19 and 20.
In No. 1, the charging time of the capacitor 23 becomes long, the phase control angle of the trigger of the triac 13 becomes large, the electric power supplied to the electric blower 14 decreases, and the output of the electric blower 14 decreases. On the contrary, when the resistance value of the sliding variable resistor 31 becomes small, the charging time of the capacitor 23 becomes short, so that the trigger phase control angle of the triac 13 becomes small and the electric blower 14
Output increases.

In this way, the output of the electric blower 14 is controlled by changing the resistance value of the continuous sliding variable resistor 31.

However, in the configuration shown in FIG. 7, an abnormal voltage is applied to the control circuit of the electric vacuum cleaner body through the connection line from the hose to the inside of the hose and the connection part of the hose consisting of the blade receivers 26 and 27 and the pins 28 and 29. In addition, there are many intrusions of abnormal current, and static electricity is charged and accumulated in the hose. In particular, the extension tube and the plastic part of the dust collecting part are significantly charged, and according to experiments, a voltage exceeding 20 kV is generated during suction, although it is disadvantageous for charging sand or cleanser.

For this reason, even if the pins come into contact with each other when the hose is attached or detached, there is a problem that an abnormal surge is applied to the circuit in the electric vacuum cleaner body to exceed the limit voltage and deteriorate the parts in the control circuit or the like, leading to destruction.

Further, a configuration disclosed in Japanese Patent Laid-Open No. Sho 61-209627 is known as a circuit for protecting the components inside the electric vacuum cleaner body from static electricity. In this vacuum cleaner, a lead wire is connected between the metal housing of the electric blower and the trigger element, and electric charges are stored by static electricity generated by the flow of air or dust in the hose. This is a configuration in which a discharge circuit for discharging is provided in the metal housing of the blower.

(Problems to be Solved by the Invention) However, in the configuration described in JP-A-61-209627, it is sufficient that only one end of the connecting portion of the metal housing and the hose of the electric blower is connected. It is difficult to discharge the electric charge in the hose, and current exceeding the limit voltage flows in the internal circuit, causing deterioration or destruction of circuit components, or
It has a problem of malfunction.

The present invention has been made in view of the above problems, and provides an electric vacuum cleaner capable of preventing malfunction due to electric charges charged in the hose and the like and preventing deterioration and destruction of built-in parts. With the goal.

[Structure of Invention]

(Means for Solving Problems) An electric vacuum cleaner of the present invention is an electric blower, a power control element connected in series to the electric blower with respect to an AC power source and controlling an input to the electric blower, and this power control element. An electric vacuum cleaner main body having a pair of connection portions electrically insulated from and connected to the electric vacuum cleaner, and a hand operation unit electrically connected to the connection portions for variably setting the output of the electric blower. It comprises a hose detachably connected to the machine body, and a gate trigger circuit which is electrically insulated from the AC power source and controls the power control element. The gate trigger circuit includes a capacitor and a hand of the hose. A charging / discharging circuit, which is variably set with a trigger time, and includes a variable resistor provided in the operation unit; A voltage limiting element for conducting a voltage equal to or more than a predetermined voltage value is connected between the pair of connecting portions and the ground side of each of the gate trigger circuits.

(Operation) The present invention sets the trigger time in the charge / discharge circuit of the gate trigger circuit in the manual operation unit, outputs the trigger time to the trigger element according to this trigger time, and the trigger element triggers and controls the power control element to control the electric blower. Change the output. In addition, when the hose is charged and the voltage is higher than a specified value when discharging the hose, the hose is discharged through the voltage limiting element to eliminate the influence on the trigger element and prevent malfunction and damage to parts. To do.

(Embodiment) An embodiment of the electric vacuum cleaner of the present invention will be described below with reference to the drawings.

In FIG. 2 and FIG. 3, 40 is the vacuum cleaner body,
The electric vacuum cleaner main body 40 includes a main body case 42 having an opening 41 formed in an upper front portion thereof, and a lid body 43 having a rear end portion axially attached to the main body case 42 to open and close the opening 41. The main body case 42 is composed of a lower main body case member 44 and an upper main body case member 45 coupled and fixed to the upper side of the lower main body case member 44, and has a front handle 46 at the front part of the main body case 42. A cover body 47 is rotatably mounted on the upper rear side of the upper body case member 45 so as to be openable and closable. A component storage 48 is provided inside the cover body 47, and
The 49 and the round brush 50 are housed, and the cover body 47 is locked by a locking piece 51. Further, a display window 53 of an indicator 52 showing the suction capacity is arranged on the front side of the component storage section 48. Further, a bumper 54 is held by the lower main body case member 44 and the upper main body case member 45 at the peripheral surface of the main body case 42.

The inside of the main body case 42 is divided into front and rear by a partition wall 56 formed in a substantially central portion and having a communication port 55, and a metal housing is provided in a space portion behind the partition wall 56.
An electric blower 58 having 57 is arranged and protected and fixed by an elastic member 59. Further, the metal housing 57 is insulated from the vacuum cleaner body 40. Further, a circuit board 60 is provided above the electric blower 58. A space portion in front of the partition wall 56 serves as the dust collecting portion 61 having the opening 41 on the upper surface and located on the negative pressure side of the electric blower 58.

Further, an exhaust port 62 communicating with the pressure boosting side of the electric blower 58 is formed on the rear surface of the main body case 42. Further, inside the main body case 42, a cord reel 64, which is located behind the electric blower 58 and accommodates the power cord 63, is rotatably provided. The cord reel 64 houses the power cord 63 by pressing the cord reel button 66 protruding from the button opening 65 of the cover body 47. further,
A pair of wheels 67 and a turning wheel 68 are rotatably provided on the lower side of the main body case 42 on the rear side of both side surfaces and the front side of the lower surface thereof.

The lid 43 is formed in a thin box shape having an open lower surface, and a body clamp 70 urged by a spring 69 is pivotally attached to the front end of the lid 43. Then, the main body clamp 70 is disengageably engaged with a locking portion 71 formed at the upper end of the front surface of the main body case 42, and the lid body 43 is held in a closed state. A handle 72 is rotatably housed near the joint between the lid 43 and the body case 42.

The front side of the upper surface of the lid 43 is formed as an inclined surface 73 that descends toward the front, and the circular opening 74 is formed in the inclined surface 73.
Are formed. An inner wall 75 is joined and fixed to the lower surface side of the lid body 43 substantially parallel to the upper surface of the lid body 43.
A substantially cylindrical support 76 is fixed between the inclined surface 73 and the inner wall 75.

Further, a rotating body 77 is located between the inclined surface 73 and the inner wall 75, and the rotating body 77 is rotatably supported by the support body 76.
Further, on the bottom surface of the rotating body 77, for example, a pair of high-voltage terminal rings 78 for supplying power to the brush motor are fixed, and these high-voltage terminal rings 78 are respectively connected to a pair of contacts 79 fixed to the inner wall 75. Slidably contacted. On the other hand, on the outer peripheral surface of the rotating body 77, a pair of low-voltage terminal rings 80 are fixed side by side in the axial direction, and these low-voltage terminal rings 80 slide on a pair of contacts fixed to the support body 76 or the like. Contacted freely.

Further, a lid 83 that is opened by inserting the main body connecting portion 82 of the hose 81 is rotatably attached to the rotating body 77. Further, an opening 74 is formed between the inclined surface 73 of the lid 43 and the rotating body 77.
A flexible sliding cover body 84 for opening and closing is provided so as to be slidably housed.

The hose 81 can be inserted into and removed from the electric vacuum cleaner body 40, and the base end of a flexible hose body 85 having a power supply line and a transmission line is attached to the main body connecting portion 82.
When the hose 81 is connected to, the power supply line is electrically connected to the pair of high voltage terminal rings 78, and the transmission line is electrically connected to the pair of low voltage terminal rings 80.

Further, at the tip of the hose body 85, there is provided a grip pipe 87 to which an extendable extension pipe 86 is insertably and removably inserted and connected, and the grip pipe 87 is provided with a hand operation unit 88. And
As shown in FIG. 4 and FIG. 5, the hand operating portion 88 is provided on a grip pipe 87 consisting of a cover pipe 89 and a connecting pipe 90 connected to the hose body 85, and the condition of the surface to be cleaned is shown. A cursor 92 that follows the sliding variable resistance is provided on the display plate 91, and is fixed by a cover body 93. In addition, extension pipe 86
A connecting pipe 95 of a suction port body 94 having a brush electric motor built therein is detachably attached thereto, and the suction port body 94 and the vine 49 or the round brush 50 can be selectively exchanged and used.

Next, the circuit of the above embodiment will be described.

In FIG. 1, reference numeral 101 denotes a commercial AC power supply, and an electric blower 5 in which a snubber circuit 104 as a protection circuit including a resistor 102 and a capacitor 103 is connected to the commercial AC power supply 101.
A triac 105 as a power control element for controlling the input power to 8 and an electric blower 58 are connected in series, and the electric blower 58 has a noise prevention circuit 110 composed of capacitors 107, 108, and 109.

A primary winding 112 of a step-down transformer 111 is connected to the commercial AC power supply 101, and a secondary winding 113 of the transformer 111 is connected to a rectifier circuit 114 composed of, for example, a diode bridge. A constant voltage circuit 117 including a resistor 115 and a Zener diode 116 is connected to the output side of 114. A resistor 118 and a resistor 119 for voltage setting, which are connected in series with the Zener diode 116 in parallel, are connected. At a connection point of the resistor 118 and the resistor 119, a programmable unijunction transistor (PUT) as a trigger element is connected. ) 120 gate is connected, and the cathode of this PUT 120 is connected to one end of a primary winding 122 of an insulating transformer 121.

A protection circuit 126 including a resistor 124 and a diode 125 is connected to the secondary winding 123 of the transformer 121, and is connected to the gate of the triac 105. And PUT120
A capacitor 127 for charging is connected between the anode of and the other end of the primary winding 122 of the transformer 121.

The connection point of the resistors 115 and 118 is directly connected to the blade receiver 129 as a connecting portion via the resistor 128, and the anode of the PUT 120 is directly connected to the blade receiver 130 as a connecting portion.
Pins 131 and 132 of the hose are connected to 9,130, respectively, and are connected to the operation circuit 133 of the hose.

The operation circuit 133 has a sliding variable resistor 134 on the pin 131.
And the first conductor 135 are connected to each other, and the pin 132 is connected to the second conductor 135.
136 is connected to the sliding variable resistor 134 and the second conductor 136.
Between the first slider 137, the first conductor 135, and the second
A second slider 138 that is interlocked with the first slider 137 is slidably connected between the conductors 136.

The operation circuit 133 provided in the hose 81 constitutes a charge / discharge circuit 140 with the capacitor 127 and the resistor 128, and the PUT 12
Set a trigger time of 0. Furthermore, this charging / discharging circuit 140
The PUT 120 or the like constitutes the gate trigger circuit 141.

In addition, the gate trigger circuit 1 from each blade receiver 129, 130.
Voltage limiting elements 142 and 143 are connected to the ground side of 41, respectively. The voltage limiting elements 142 and 143 are resistance elements that are sensitive to high voltage, such as a varistor that is a voltage non-linear resistance element that can conduct a large current when the voltage is applied to the elements, which is high resistance at low voltage and low resistance at high voltage. , Use one that conducts when the allowable voltage of the parts in the circuit is exceeded.

The same effect can be obtained by using a discharge gap element as the voltage limiting element.

In addition, a Zener diode may be used when a large current needs to flow only in one direction.

Next, the operation of the circuit of the electric vacuum cleaner of the above embodiment will be described.

First, the first and second sliders 137 and 138 are slid to set the sliding variable resistor 134 to a resistance value corresponding to the desired output of the electric blower 58. When this resistance value is increased, the time constant determined by the resistor 128, the sliding variable resistor 134 and the capacitor 127 increases, and the charging time of the capacitor 127 increases. Therefore, it takes a long time until the anode voltage of the PUT 120 becomes higher than the gate voltage of the PUT 120, and the PUT 120 turn-on time is delayed. Then, the phase control angle of the triac 105 becomes large, and the electric blower 58 is driven with a small output.

On the contrary, when the resistance value of the sliding variable resistor 134 is reduced, the time constant of the resistor 128, the sliding variable resistor 134 and the capacitor 127 is reduced, and the charging time of the capacitor 127 is shortened. For this reason, the time until the voltage of the PUT 120 becomes higher than the gate voltage of the PUT 120 becomes short, and the time when the PUT 120 turns on becomes short. Then, the phase control angle of the triac 105 becomes small, and the electric blower 106 is driven with a large output.

In addition, the voltage limiting elements 142 and 143 normally have a high resistance value and a current cut off because the voltage is below a predetermined value, but externally induced noise and static electricity charged on the hose 81, the extension tube 86, the dust collecting portion 61, etc. When a high voltage is applied due to the electric charge, the resistance becomes low and the current is conducted to bypass the current and flow to the ground side of the gate trigger circuit 141.

Next, another embodiment will be described with reference to FIG.

The circuit shown in FIG. 6 corresponds to the electric blower 58 of the circuit shown in FIG.
The metal housing 57 is electrically connected to the ground side of the gate trigger circuit 141.

Then, when noise invades or abnormally high voltage, the transformer 111
With the transformer 121, the electric charge existing in the circuit insulated from the commercial AC power supply 101 is released to the metal housing 57, and the discharge circuit is formed via the noise prevention circuit 110. It is what makes me.

According to the embodiment shown in FIG. 6, the electric charge between the transformer 111 and the transformer 121 flows through the metal housing 57 and the noise prevention circuit 110 at the time of noise intrusion or abnormally high voltage. Gate trigger circuit 14 between the transformer and the transformer 121
The electric charge is not accumulated in 1 etc., and it is possible to prevent malfunction.

Since the voltage limiting elements 142 and 143 are provided in any of the above-described embodiments, noise and abnormal high voltage do not flow in the PUT 120, so that malfunction can be prevented. In addition, Zener diode 116, PUT12
Semiconductor elements such as 0, capacitors 127, resistors 118, 119, 128
It is possible to prevent destruction of elements such as.

〔The invention's effect〕

According to the present invention, since the voltage limiting element is connected to the ground side of the gate trigger circuit from both ends of the connecting portion connected to the hose, noise and abnormal voltage superimposed on the electric charge in the hose having a predetermined voltage value or more are detected. Since it can be escaped through the limiting element, malfunction due to the gate trigger circuit can be prevented and internal components can be protected.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIG. 2 is a perspective view of the same electric vacuum cleaner, FIG. 3 is a sectional view of the same, and FIG. 4 is a side view of the same hand operating section. Is a front view of the above, FIG. 6 is a circuit diagram showing another embodiment, and FIG. 7 is a circuit diagram showing a conventional example. 40 …… vacuum cleaner body, 57 …… metal housing, 58…
… Electric blower, 61 …… Dust collector, 81 …… Hose, 88 …… Hand operation part, 101 …… Commercial AC power supply, 105 …… Triac as power control element, 120 …… Programmable unit as trigger element Junction transistor (PU
T), 127 ... Capacitor, 129, 130 ... Blade receiving as a connecting part, 134 ... Sliding variable resistance, 140 ... Charge / discharge circuit, 141
...... Gate trigger circuit, 142,143 …… Voltage limiting element.

Claims (1)

[Claims] 1. An electric blower, a power control element that is connected in series to the electric blower with respect to an AC power source, and controls an input to the electric blower, and a pair of connections electrically connected to the electric power control element. An electric vacuum cleaner body having a portion, a hose electrically connected to the connection portion and having a hand operation portion for variably setting the output of the electric blower, and a hose detachably connected to the electric vacuum cleaner body, And a gate trigger circuit that is electrically insulated from an AC power source and controls the power control element. The gate trigger circuit is composed of a capacitor and a variable resistor provided in a manual operation portion of the hose, and the trigger time is variable. A charging / discharging circuit to be set, and a trigger element that triggers the power control element by the output of the charging / discharging circuit. Vacuum cleaner, characterized in that connecting the voltage limiting element that conducts a predetermined voltage value or more voltage between the ground side of the gas circuit.