JPH03244421A - Constraint protecting device of rotary brush driving electric motor in electric cleaner - Google Patents

Abstract

PURPOSE:To inform an operator of the constraint of a rotary brush to remove a foreign material and allow the cleaning to continue by detecting the eddy current of an electric motor so as to detect the constraint of the rotary brush, substantially interrupting the power supply to the electric motor, and also giving an alarm. CONSTITUTION:When a rotary brush 10 is constrained during the use of an electric cleaner, an electric motor 12 is also constrained through a belt 11. An eddy current is sent to the electric motor by the constraint of the electric motor 12. When the eddy current is detected continuously for a determined time by a current detector circuit 14, this is detected by the delay means of a circuit 16, and a holding means is held in operating state. Under this held state, the power supply to the electric motor 12 is interrupted through an electric motor control circuit 13, and an alarm device 15 is also operated. The power supply switch of the electric motor and constraint protecting device thereof are opened in this state to remove a foreign material from the rotary brush 10, and then the power supply switch is again inputted, whereby the holding state of the holding means of the circuit 16 is released, and the electric motor 12 and the rotary brush 10 are normally rotated.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a restraint protection device for a rotating brush driving electric motor in a vacuum cleaner, and is designed to protect the electric power supplied to the electric motor when the rotating brush is restrained. It is designed to substantially cut off the motor and warn that the rotating brush has been restrained or that the power to the motor has been substantially cut off.

[Prior Art] Generally, as a suction type vacuum cleaner, a rotating brush is provided at a suction port attached to a pipe body at the end of a suction hose, and the rotating brush is rotated by a dedicated electric motor. There is. In this device, the floor surface to be cleaned, such as a stack of papers, is struck by the rotation of a rotating brush, and dust is ejected from the depths of the stack of papers, and the dust is scraped up by the rotating brush, and the dust is efficiently sucked.

By the way, in such a vacuum cleaner with a rotating brush, if a foreign object such as a sock is accidentally caught in the rotating brush, the foreign object will be caught between the rotating brush and its frame, and the rotating brush will stop rotating. As a result, the rotation of the electric motor that drives the rotating brush (via the belt) also stops, causing overcurrent to flow through the electric motor due to overload. If this state continues for a long time, the electric motor may generate heat and be damaged.

In addition, due to the above-mentioned foreign matter getting caught in the rotating brush and its frame, if the electric motor attempts to rotate further in this state, the frame may be damaged. If the foreign object is a human finger, if the electric motor tries to rotate further, there is a risk that the finger will be damaged even more.

Overload of the electric motor occurs not only when the rotating brush stops as described above, but also when dust accumulates on the bearing of the rotating brush and the rotation of the rotating brush becomes heavy.

In this specification, not only the state in which the rotating brush or electric motor stops, but also the state in which the rotation becomes abnormally heavy is referred to as "restricted."

In view of the above, in order to protect the motor from such restraint and at the same time to prevent the rotating brush frame from being damaged as described above, a restraint protection device as shown in FIG. 3 has been conventionally used. was.

In FIG. 3, reference numeral 1 denotes the above-mentioned AC motor for driving the rotating brush, and the motor includes a thermistor 2, a resistor 3,
It is connected to a commercial commercial current m6 via a fuse 4 and a power switch 5 in series. A capacitor 7 is connected to the connection point between the thermistor 2 and the resistor 3 and the connection point between the motor 1 and the power source 6.

When the above-mentioned power switch 5 is turned on, a driving current flows from the power supply 6 to the electric motor l via the refuse 4, resistor 3 and thermistor 2, and the electric motor rotates to drive the belt (not shown).
The rotating brush is rotated through. When the electric motor 1 is restrained as described above in this state, an overcurrent flows through the electric motor 1 via the thermistor 2 and the like. The thermistor 2
When overcurrent flows, power consumption increases and temperature rises.

When this temperature exceeds a certain temperature, the resistance value increases rapidly. Due to this increase in resistance value, the current flowing through the electric motor 1 is reduced (substantially cut off), thereby making it possible to prevent burnout and reduce the rotational force.

The capacitor 7 is used to absorb high frequency noise generated by the motor 1, and the resistor 3 is used to protect against current flow and to further enhance the noise reduction effect of the capacitor 7. Also, safety fuse 4
is for when the motor 1 or the capacitor 7 is short-circuited.

[Problems to be Solved by the Invention] Incidentally, a vacuum cleaner is equipped with a suction motor for sucking in dust in addition to the electric motor that drives the above-mentioned rotating brush, so it makes a lot of noise. When the rotating brush is locked, the current in the motor for the rotating brush decreases due to the overcurrent flowing through the thermistor, and even if the rotational force decreases, the person operating the vacuum cleaner often does not notice this. Therefore, when a foreign object gets caught in the rotating brush, the rotational force of the motor decreases,
Cleaning will continue even when the rotating brush is not operating.

Further, in a vacuum cleaner equipped with a rotating brush, when cleaning a pile of paper with relatively long bristles, the bristles may get caught up in the rotating brush, and the rotating brush may be restrained. In such a case, the rotation brush is often released from the restriction by lifting the suction port provided in the tube at the tip of the suction hose and separating the suction port from the paper.

However, in the conventional type, the person operating the vacuum cleaner does not notice that the rotating brush is restricted by the bristles as described above, and the suction port is not removed from the paper surface. The current causes the electric current of the rotating brush motor 1 to decrease, resulting in a decrease in its rotational force. When cleaning carpets with relatively long bristles, the rotating brush is often constrained by the bristles.
If the rotational force of the electric motor 10 for the rotating brush decreases each time, the efficiency of cleaning will decrease.

Incidentally, if the current in the rotating brush motor l decreases due to an overcurrent flowing through the thermistor 2, even if the motor 1 is unrestrained, the current in the motor 1 will not recover until the temperature of the thermistor falls below a certain temperature. Therefore, the above-mentioned work efficiency is further reduced.

The first object of the present invention is to solve the former of the above-mentioned problems, and to make the operator aware of this and to be able to remove foreign objects when the electric motor for a rotating brush is restrained. This is how it was done.

The second object of the present invention is to solve the latter of the above-mentioned problems, and it is possible to perform operations even before the electric power supplied to the drive motor is cut off due to the restriction of the rotating brush. For example, by lifting the suction port above the paper, the rotating brush can be freed from the restriction caused by the bristles of the pile of paper.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention includes a restraint detection means for detecting that the rotating brush is restrained, and a restraint detecting means for detecting that the rotating brush is restrained. and a motor control means for substantially cutting off the power supply to the electric motor, further comprising a warning means, the warning means being activated when the power supply to the electric motor is substantially cut off. The restraint detecting means and the motor control means may be constructed of the same member, and the restraint detecting means may detect an overcurrent flowing through the electric motor when the motor is restrained. It may also be something that detects the rotation of.

Further, in the present invention, the restraint detecting means detects that the rotating brush is restrained, the warning means is activated when the rotating brush is restrained by the means, and the restraint detecting means detects that the restraint state is determined by the predetermined state. a delay means that produces an output when time is continuously detected; a holding means operated by the output of the delay means; and a motor control that is controlled by the holding means and cuts off power supplied to the electric motor in the holding state. means, and when the holding means is in the above-mentioned holding state, the holding means operates the warning means.

[Function] Among the restraint protection devices for the electric motor for driving the rotary brush in a vacuum cleaner as described above, in the former structure, when the rotary brush is restrained, this is detected by the restraint detection means, and the electric motor is The control means is operated to substantially cut off the power supply to the electric motor, and the warning means is operated to warn that the power supply to the electric motor has been substantially cut off.

Furthermore, in the latter configuration, when the rotating brush is restrained, this is detected by the restraint detection means, and when the restraint of the rotary brush is detected by the means, the warning means is activated. When the restraint state continues to be detected by the restraint detection means for a predetermined period of time, the delay means produces an output, and the holding means is operated by the output of the delay means. When the holding means is in the holding state, electric power supplied to the electric motor is cut off by the motor control means, and when the holding means is in the above-mentioned holding state, the holding means operates the warning means.

After opening the power switch of the electric motor and the motor's restraint protection device, the holding state of the holding means is released by removing foreign matter from the rotating brush and turning on the power switch again, and the rotating brush is returned to normal operation by the electric motor. rotated to Further, if the rotating brush is released from the restraint before the holding means enters the holding state, the warning means returns to the non-operating state.

[Example] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram schematically showing a restraint protection device for a rotating brush driving electric motor in a vacuum cleaner. In FIG. 1, reference numeral 10 denotes a rotating brush, which is rotated by an electric motor 12 via a bell (11). 13
is a motor control circuit, and the operation of this circuit causes the motor 1 to
The driving power supplied to 2 is cut off. Reference numeral 14 denotes a current detection circuit, which detects when the current flowing through the motor 12 becomes an overcurrent and indirectly detects whether the rotating brush 10 is restricted. 15 is a warning device, which is connected to the current detection circuit 1 through a warning drive and delay circuit 16, which will be described later.
In addition to being activated when an overcurrent is detected by the circuit 4, the circuit 16 is activated as described later, and is also activated when power supplied to the motor 12 via the motor control circuit 13 is cut off. Reference numeral 16 designates the above-mentioned warning drive and delay circuit, which is activated when an overcurrent is detected by the current detection circuit 14, operates the warning device 15 as described above, and has a delay means and a holding means. When the delay means detects that the current is continuously detected for a predetermined period of time, the holding means is held in the operating state, and during this holding period, the motor control circuit 13 is operated to supply the electric motor 12. In addition to cutting off the power, the warning device 15 is also operated as described above. The maintained operating state of the circuit 16 is canceled by once cutting off the power supply current to the circuit 16 and then supplying it again.

In the motor restraint protection device configured as described above, when the rotating brush 1O is restrained during use of the vacuum cleaner, the electric motor 12 is also restrained via the bell 11. Due to the restriction of the electric motor 12, an overcurrent flows through the electric motor, and when this is detected by the current detection circuit 14, the warning device 16 is immediately activated via the warning drive and delay circuit 16.

In this state, when the electric motor 12 is released from the restraint within the predetermined time, the current detection circuit 14 no longer detects an overcurrent, and the warning device 15 via the circuit 16 returns to the non-operating state.

When the overcurrent is continuously detected by the current detection circuit 14 for a predetermined period of time, this is detected by the delay means of the circuit 16, and the holding means is held in an operating state.

In this held state, not only the power supply to the motor 12 is cut off via the motor control circuit 13, but also the warning device 15
is also operated.

In this state, the power switch (not shown) of the electric motor and its restraint protection device is opened, foreign matter is removed from the rotating brush IO, and the power switch is turned on again to hold the holding means of the circuit 16. The state is released and the electric motor 12 and rotating brush 1O no longer rotate normally.

Next, specific circuits of each block in the block diagram explained with reference to FIG. 1 will be explained using FIG. 2.

In FIG. 2, the same reference numerals as in FIG. 1 indicate the same parts. Reference numeral 17 is a power plug, through which commercial power current is supplied. 1B indicates a power switch.

The motor control circuit 13 includes a thyristor D7, a transistor Q1, and the like. One end of the motor 12 is connected to the terminal T2 of the thyristor 07, passes through the terminal T1 of the thyristor, and is connected to the voltage detection resistor R1 of the current detection circuit 14.
The other end is connected to the power terminal A via the power terminal A, and the other end is connected to the power terminal A.

The gate G of the thyristor D7 is connected to the collector of a transistor controlling the thyristor 07 via a resistor R4, and the emitter of the transistor is connected to a Zener diode 03 for maintaining a constant voltage, resistors R5 and R6, and a rectifying diode controller. 2 to the power supply terminal.

The base of the transistor Ql is connected to the power supply terminal a via resistors R8 and R7.

One end of the half-wave rectified voltage smoothing capacitor C2 of the rectifier diode D2 is connected to the power supply terminal a, and the other end is connected to the common connection point of the Zener diode D3 and resistors R5 and R6. Zener diode D4 connected in parallel with capacitor C2 is connected to capacitor 0.
2 is inserted as a safety measure to prevent the voltage from exceeding the rated value.

The current detection circuit 14 includes the voltage detection resistor R1, a light emitting diode portion of the photocoupler P)II, and the like. One end of the resistor R1 is connected to the power supply terminal a as described above, and the other end is connected to the terminal T1 of the thyristor D7. Then, from the power supply terminal a, via a rectifier diode D1 and an integrating circuit (consisting of a resistor R2 and a capacitor CI),
It is connected to a common connection point between the resistor R1 and the terminal T1 of the thyristor D7, and a resistor R3 for discharging the capacitor and a light emitting diode portion of the photocoupler PH1 are connected in parallel with the capacitor C1.

The warning device 15 is composed of a light emitting diode DIOI, and the anode of the light emitting diode is connected to the resistors R9, R11, capacitors C3, C4, and the above-mentioned warning drive and delay circuit 1.6.
Cathode K of thyristor 08 and Zener diode 0
5, the light emitting diode DIO
The cathodes of I are Zener diodes D3, C4, C5,
It is connected to the common connection point of capacitor C2 and resistors R5 and R6.

The warning drive and delay circuit 16 includes a transistor portion of the photocoupler P, a resistor RIO and a capacitor C3 forming a delay means, a self-holding thyristor D8 serving as a holding means, and the like. The collector of the transistor portion of the photocoupler PH1 is connected to the power supply terminal a, and its emitter is connected to the common connection point of the resistor RIO5R11.

As described above, the other end of this resistor R11 is connected to the cathode of the light emitting diode 0101 and to the common connection point described above. An integrating circuit (j! extension means) consisting of a resistor RIO and a capacitor C3 is connected in parallel with the resistor R11, and the other end is connected to a thyristor D from a common connection point of the resistor RIO and the capacitor C3 via a Zener diode D6.
It is connected to a common connection point between the external noise absorbing resistor R9 and the capacitor C4. The cathode of the thyristor D8 is connected not only to the Zener diode D5 as described above but also to the other common connection points described above. The anode A of the thyristor D8 is connected to the common connection point of the resistors R7 and R8 of the motor control circuit 13. The other end of the Zener diode D5 is the capacitor C2 of the motor control port gala, and the Zener diode D
3. It is connected to the common connection point of D4 and resistors R5 and R6.

The Zener diode D5 is a light emitting diode 0101.
This is to enable the motor control circuit 13 to operate even when the circuit enters the oven state due to some reason, and it is also possible to use a resistor instead. You don't have to use it if you don't have any concerns.

Next, the operation of the one shown in FIG. 2 will be explained.

When the power switch 18 is turned on, the power supply voltage is applied between the power supply terminals a and b, and the resistor R of the motor control circuit 13
? , R8 to the base of the transistor Ql. As a result, current flows into the collector of the transistor Q1 from the gate of the thyristor D7 through the resistor R4, so the transistor Q1 shifts to the ON state.
Subsequently, the thyristor 07 also shifts to the ON state. This thyristor 07 controls the alternating current between the terminals TI and 72 by the current flowing from the terminal T1 to the gate G, and the alternating current between the terminals TI and 72 is controlled.
starts normal operation, rotates, and becomes ready for cleaning operations.

If the rotating brush catches foreign matter during this cleaning operation, the electric motor 12 is restrained via the belt, and an overcurrent flows through the electric motor. This overcurrent increases the voltage drop across the resistor R1, and the capacitor CI of the current detection circuit 14 is charged. When this charging voltage reaches a predetermined value, the light emitting diode portion of the photocoupler pHl turns on and emits light, and this light emission causes the transistor portion to turn on and supply the input voltage to the warning drive and delay circuit 16. Due to this transition of the transistor portion to the ON state, the light emitting diode DIOI of the warning device 15 lights up.

On the other hand, as the transistor portion shifts to the ON state, a voltage is applied to the delay means of the warning drive and delay circuit 16, and the capacitor C constituting the delay means
3 charging voltage is Zener diode D6 and thyristor D
When the voltage exceeds the voltage determined by the sum of the gate voltage of D8 and the gate voltage of D8, the thyristor D8 shifts to the ON state.

Here, Zener diode 03 of motor control circuit 13
The sum of the Zener voltage Vo3, the base-emitter voltage VIE of the transistor Ql, and the voltage drop occurring across the resistor R8 is set to be larger than the sum of the ON voltage of the thyristor D8 and the ON voltage of the light emitting diode 0101 of the warning device 15. Therefore, when the thyristor 08 shifts to the ON state as described above, the voltage in the motor control circuit 13 cannot be maintained. Therefore, the voltage and current necessary to maintain the ON state are no longer supplied between the base and emitter of the transistor Q1, and the transistor shifts to the OFF state.

This transistor Ql turns ON/OFF the thyristor 07.
Since the transistor Ql is in the OFF state, no current flows between the terminals T1φG and G of the thyristor D7, so the thyristor 07 shifts to the OFF state.

In this way, by turning the thyristor D7 into the OFF state, the power supply to the electric motor 12 is cut off, and the electric motor 12, the rotating brush, and its frame are protected.

The above-described input voltage to the warning drive and delay circuit 16 is no longer supplied because when the thyristor 07 turns OFF as described above, the photocoupler P also turns OFF, but the thyristor 08 is When the input to the G cathode and the ON state is maintained, the ON state is maintained as long as the specified current is maintained at the anode A cathode. Current continues to flow from terminal a to the power supply terminal through resistor R7, thyristor D8, light emitting diode 0101, resistors R5 and R6, and rectifier diode 02, and motor 1
Continues to cut off power supply to 2 and light emitting diode 0
Keep 101 lit.

In this way, in a state where the power supply to the motor is cut off due to the self-holding of the thyristor 08 and the light emitting diode 0101 is lit, the power switch 18 is turned on.
When the thyristor D8 is released and then turned on again, the self-holding state of the thyristor D8 is released and the thyristor D8 returns to its original state.

The photocoupler PHI of the warning drive and delay circuit 16 is O.
The time from when the thyristor 08 shifts to the N state to when the thyristor 08 shifts to the ON state depends on the input voltage to the delay means and its time constant, the Zener voltage of the Zener diode 06, and the gate G and cathode of the thyristor D8. This is determined by the sum of the mold pressure, and when the photocoupler PHI turns off within this predetermined time, that is, when the electric motor 12 is no longer restrained, the light-emitting diode ()'0101 that was lit turns off and normal operation resumes. return to the state.

Incidentally, in FIG. 2, the same effect and operation can be obtained even without the capacitor C1, resistor R3, and diodes Di and DO. Furthermore, the electric motor is not limited to an AC motor. Furthermore, the Zener diode D3 can be replaced with a resistor.

In the circuit shown in Fig. 2 above, photocoupler PH1 was used, but
A transistor may be used instead of the photocoupler. FIG. 4 shows a circuit using transistors, and since the same reference numerals as in FIG. 2 indicate the same elements, a detailed explanation thereof will be omitted.

In FIG. 4, reference numeral Q2 is a transistor in place of the photocoupler, and R12 is a base resistor of the photocoupler.

In the motor restraint protection device as shown in FIG.
When an overcurrent flows through the resistor R1, the voltage drop across the resistor R1 increases, causing the transistor Q2 to turn on. As a result of this transition to the ON state, the light emitting diode 0101 lights up, as in the case of FIG. 2, and current is also supplied to the delay means, causing the thyristor D8 to transition to the ON state and self-maintain in this state. Ru. Due to this self-holding, the thyristor D7 shifts to the OFF state, the power supply to the motor 12 is cut off, and the light emitting diode 0101 continues to light up.

In the embodiments described in FIGS. 1, 2, and 4, a means for detecting overcurrent flowing through the electric motor was used as a means for detecting restraint of the rotating brush. A device that detects the rotation of the brush may also be used.

[Effects of the Invention] This invention is as described above, and since it is configured as claimed in claim 1, the operator can certainly know that the power supply current of the electric motor for driving the rotating brush has been cut off. You can continue cleaning by removing foreign objects caught in the rotating brush.

In addition, since it is configured as claimed in claim 2, the power supply current to the motor can be cut off even if hair frequently gets wrapped around the rotating brush and the motor is restrained, such as when a comparison angler cleans a long pile of paper. The operator will definitely know that the hair has been previously restrained and can continue cleaning by untying the hair.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing one embodiment of the present invention, Fig. 2 is a circuit diagram of the one shown in Fig. 1, Fig. 3 is a circuit diagram showing a conventional example, and Fig. 4 is a circuit diagram showing another embodiment of the invention. FIG. 1O double rotating brush, 11: Belt, 12: Electric motor, 13
: Motor control circuit, 14: Current detection circuit, 15: Warning device, 16: Warning drive and delay circuit.

Claims (4)

[Claims] (1) A restraint protection device for a motor for driving a rotating brush in a vacuum cleaner, comprising a restraint detecting means for detecting that the rotary brush is restrained, and a restraint detecting means for detecting that the rotary brush is restrained; and a motor control means for substantially cutting off power supply to the electric motor, the warning means being configured to operate when the power supply to the motor is substantially cut off. A restraint protection device for a rotating brush drive motor in a vacuum cleaner, characterized by: (2) A restraint protection device for a motor that drives a rotating brush of a vacuum cleaner, which includes a restraint detection means for detecting that the rotary brush is restrained, and operates when the means detects restraint of the rotary brush. a delay means that produces an output when the restraint state continues to be detected by the restraint detection means for a predetermined period of time; a holding means operated by the output of the delay means; A vacuum cleaner comprising a motor control means for cutting off electric power supplied to the electric motor in the holding state, and in which the holding means operates the warning means when the holding means is in the above-mentioned holding state. A restraint protection device for an electric motor for driving a rotating brush. (3) The restraint protection device according to claim 1 or 2, wherein the restraint detection means detects an overcurrent flowing through the electric motor when the motor is restrained. (4) The restraint protection device according to claim 1 or 2, wherein the restraint detection means detects rotation of the rotating brush.