JP3341959B2 - Electric vacuum cleaner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cleaner having a suction body provided with a rotating body rotated by an electric motor.

[0002]

2. Description of the Related Art Conventionally, as a vacuum cleaner of this type, for example, a structure described in Japanese Patent Application Laid-Open No. Hei 5-14687 is known.

[0003] The vacuum cleaner disclosed in Japanese Patent Application Laid-Open No. 5-146387 is provided with a rotary body such as a cleaning blade in a suction port main body, and the rotary body is driven to rotate by an electric motor. Further, when an overcurrent of a predetermined set value or more that is larger than the current flowing through the motor during normal cleaning flows through the motor, the power supplied to the motor is reduced. The power supply to the motor is stopped and the motor is stopped. In this way, it is possible to prevent foreign matter from being caught in the rotating body, heating the electric motor, heating the electronic components or damaging the floor surface, and also prevent deterioration of the operability due to frequent stoppage of the electric motor. .

[0004]

However, for example, in the case of a rare short-circuit in which foreign matter is entangled with the rotating body or the coils of the motor are short-circuited, it is necessary to immediately stop the current and stop the motor. On the other hand, when the current is increased due to an increase in the load by pressing the suction port body against the carpet, if the electric power supplied to the electric motor is not reduced within a predetermined time, the life of the electric motor is greatly reduced. However, there is a problem that the operability deteriorates when the power is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vacuum cleaner which can achieve both protection of the vacuum cleaner and improvement of operability.

[0006]

The vacuum cleaner of the present invention comprises:
A suction port main body, a rotating body provided in the suction port main body,
An electric motor for rotating the rotating body, and control means for controlling the electric motor, the control means, the moving direction detecting means for detecting the moving direction of the suction port body, the first set current value, and An overcurrent detecting means having a second set current value larger than the first set current value, and detecting an overcurrent state in which a current value supplied to the motor exceeds each of the set current values; corresponding to the first set current value
First setting time set Te, and the set corresponding to the second set current value has a short <br/> second set time than the first set time, the over current detection Detected by means
Measurement means for measuring a time in a state of overcurrent, the
In the measurement by the measuring means, the first set current value was exceeded.
When the state has passed the first set time or more; and
The state exceeding the second set current value is at the time of the second setting.
When the time has passed, the current supplied to the
Stopping means for shutting off, corresponding to the second set current value
In an overcurrent state, the moving direction detecting means is connected to the suction port main body.
Even if reversal is detected, the measurement of the measuring means is not reset,
Those prior Symbol first set current value the moving direction detecting means overcurrent state corresponding to has a reset means for resetting the total measurement of the detection to the previous SL measuring means inversion of the suction port body is there.

[0007]

According to the vacuum cleaner of the present invention, the overcurrent detection means detects the current.
Current value of the motor exceeds a first set current value, the time overcurrent state exceeding the first set current value measured by the measuring means, in response to the first set current value If you lapse set first set time or longer was <br/>, Ru a current supplied to the motor to stop the motor by interrupting the stop means. Also ,
If the current value of the motor detected by the overcurrent detection means exceeds the second set current value, the overcurrent exceeding the second set current value
The flow state time is measured by the measuring means, and the second state is set in correspondence with the second set current value and is shorter than the first set time.
If you lapse of the set time or more, the current supplied to the electric motor
The stopping means shuts off and stops the motor . Therefore , in the case of the first set current value, the operation of the motor is continued for a relatively long time, and in the case of the second set current value, the motor is stopped in a relatively short time. In addition, the current corresponding to the first set current value
When the moving direction detecting means detects the reversal of the suction port main body in the current state, the measurement of the measuring means is reset, and in the overcurrent state corresponding to the second set current value , the moving direction detecting means resets the suction port.
Resets the measurement by the measuring means even if the reversal of the main body is detected.
Absent. For this reason, the motor can be reliably protected from overcurrent, and a decrease in operability is prevented.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a vacuum cleaner according to an embodiment of the present invention.

In FIG. 3, reference numeral 1 denotes a vacuum cleaner main body, and a base end of a hose 2 is detachably connected to the vacuum cleaner main body 1, and a distal end of the hose 2 is branched backward. A hand operation unit 3 having a shape is provided. Further, a suction port main body 5 is attached to a distal end of the hand operation unit 3 via a telescopic extension tube 4.

As shown in FIG. 4, the suction main body 5 has a suction chamber 11 formed in the front thereof in a substantially left-right direction, and a cleaning blade as a rotating body is provided in the suction chamber 11. The cleaning blade 12 has a pulley 13 formed at one end thereof.

Also, at one end on the rear side, a motor housing 14 is provided.
Is formed, and the motor 15 is housed therein.
A drive pulley 17 is provided on 16, a drive belt 19 is stretched between the pulley 13 of the cleaning blade 12 and the drive pulley 17, and the cleaning blade 12 is rotated by an electric motor 15.

A connecting pipe is provided substantially at the center of the suction port main body 5.
A vacuum cleaner 20 is provided rotatably in the up and down direction, and the vacuum cleaner main body 1 is provided through the suction chamber 11 and the extension pipe 4 and the hose 2.
A communication passage 21 communicating with is formed.

On the other hand, a control section storage chamber 22 is formed at the other end on the rear side.
Is provided.

The control unit housing chamber 22 is provided with a rotation direction detecting unit 24 for detecting the traveling direction. As shown in FIG. 5, the rotation direction detecting unit 24 includes a rotating roller which is rotated in a direction according to the traveling direction of the suction port main body 5 by contacting the floor surface in a switch case body 25 having an open lower surface. 26
Reflecting rollers 28a and 28b as rotating members are mounted coaxially with the rotating shaft 27 of the rotating roller 26. The lower surfaces of the reflecting rollers 28a and 28b are screwed with a case cover body 29 for preventing dust from entering. It is attached at. As shown in FIG. 6, the reflection rollers 28a and 28b have reflection surfaces 28a1 and 28b1 and non-reflection surfaces 28a2 and 28b2 that are different from each other by 90 ° and are formed at 180 °.

Furthermore, photo sensors 31a and 31b, which are non-contact type sensors, are mounted on the switch case body 25 so as to face the reflection rollers 28a and 28b with a gap therebetween.

Next, an electric circuit will be described with reference to FIGS.

First, as shown in FIG.
The AC input terminal of the full-wave rectifier circuit 41 is connected to a commercial AC power supply E. The output terminal of the full-wave rectifier circuit 41 includes a diode D1, a resistor R1, and a zener diode ZD for constant voltage.
1 is connected, and a smoothing capacitor C1 is connected in parallel with the Zener diode ZD1.
The connection terminal of the capacitor C1 is a constant voltage source Vcc.

Further, between the diode D1 and the resistor R1,
The transistor Q1, the field effect transistor Q2, and the current detecting resistor R2 are connected in series, and a series circuit of the transistor Q3 and the field effect transistor Q4 is connected in parallel with the transistor Q1 and the field effect transistor Q2. And the transistor Q1, the field effect transistor Q2, the transistor Q3 and the field effect transistor
Switching means 43 is constituted by Q4.

Further, an emitter, a collector and a resistor R3 of the transistor Q5 are connected between the base and the emitter of the transistor Q1.
It is connected to a connection point between the diode D1 and the resistor R1 via R4, and to a connection point between the transistor Q3 and the field effect transistor Q4 via a resistor R5. An emitter, a collector, and a resistor R6 of the transistor Q6 are connected between the base and the emitter of the transistor Q3.The base of the transistor Q6 is connected to a connection point of the diode D1 and the resistor R1 via the resistor R7.
It is connected to the connection point between the transistor Q1 and the field effect transistor Q2 via the resistor R8.

A series circuit of a resistor R11 and a resistor R12 is connected between the output terminals of the full-wave rectifier circuit 41, and an inverter circuit 42 is connected to a connection point of the resistors R11 and R12. 42 output terminals are 1
A clock terminal CK that outputs a clock every 0 ms is configured.

On the other hand, in the control means 44, the photo sensor 31a is connected to the clock terminal of the D-flip-flop circuit 45 for detecting the traveling direction, and the photo sensor 31b is connected to the data input terminal. Are connected to the moving direction detecting means 46. The moving direction detecting means 46 has flip-flop circuits 47, 48, 49, 50,
Connected to the gate of field effect transistor Q2 via AND circuit 51 and AND circuit 52,
Field effect transistor Q4 via 53 and AND circuit 54
Connected to the gate. Further, the photo sensor 31b is connected to a monomultivibrator circuit 55 for maintaining operation, and a connection point of the resistor R15 and the capacitor C2 connected between the constant voltage source Vcc and the ground is connected to the monomultivibrator circuit 55. The output terminal Q of the mono multivibrator circuit 55 is connected to the AND circuit 52 and the AND circuit
Connected to 54. The non-inverting input terminal Q and the inverting input terminal Q of the D-flip-flop circuit 45
The flip-flop circuits 47 and 48 and the flip-flop circuits 49 and 50 are connected two by two to form photo sensors 31a and 31b.
Corresponding to the reversal from

The control means 44 has an overcurrent detection means 61. The overcurrent detection means 61 sets a first set current value of an overcurrent of 1 A which is a relatively small current value, for example. A series circuit connected between the constant voltage source Vcc of the resistors R16 and R17 and the ground, and a resistor R18 for setting a set current value of an overcurrent of 2.5 A which is a larger current value
And a series circuit connected between the constant voltage source Vcc of the resistor R19 and the ground.

The connection point between the resistors R16 and R17 is connected to the inverting input terminal of the operational amplifier 62, the non-inverting input terminal of the operational amplifier 62 is connected to the current detecting resistor R2, and the output terminal is connected to the resistor R21. It is connected to a constant voltage source Vcc through the input terminal of the monomultivibrator circuit 63. The connection point of the resistor R18 and the resistor R19 is connected to the inverting input terminal of the operational amplifier 64, and the non-inverting input terminal of the operational amplifier 64 is connected to the current detecting resistor R2.
The output terminal is connected to the constant voltage source Vcc via the resistor R22.
And to the input terminal of the mono-multi vibrator circuit 65. Further, the input terminal of the monomultivibrator circuit 63 has a resistor R23 and a capacitor of a series circuit of a constant voltage source Vcc for setting operation stabilization time of, for example, 1.5 ms and a resistor R23 and a capacitor C3 connected between the ground and a constant voltage source Vcc. The connection point of C3 is connected, and similarly, the input terminal of the monomultivibrator circuit 65
A connection point between the resistor R24 and the capacitor C4 of a series circuit of the resistor R24 and the capacitor C4 connected between the constant voltage source Vcc for setting a time of 1.5 ms for stabilizing the operation and the ground is connected.

The reset terminal of the mono-multivibrator circuit 63 is connected to the output terminals of the AND circuit 51 and the AND circuit 53 via an OR circuit 66 as reset means. In addition, a reset component 67 as reset means for detecting activation of the electric motor 15 is connected.

Further, measuring means 70 is connected to the output terminals of the mono-multivibrator circuit 63 and the mono-multivibrator circuit 65, and the measuring means 70 has a relatively long 200 clocks corresponding to an overcurrent of a relatively small current value. Two counter circuits 71 for setting a set time of about 2 seconds,
72 and a counter circuit 73 for setting a set time of about 40 ms, which is four clocks corresponding to an overcurrent having a larger current value.
The counter circuit 72 and the counter circuit 73
Is connected to an OR circuit 74, an output terminal of the OR circuit 74 is connected to an input terminal of a monomultivibrator circuit 75 as a stopping means, and an inverted output terminal Q of the monomultivibrator circuit 75 is connected to an AND circuit 52 and an AND circuit 54. Is connected to the input terminal of

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

First, as shown in FIG. 7, when the output of the photo sensor 31a falls from the H level to the L level while the photo sensor 31b is at the H level as shown in FIG. Is detected, for example, is moving forward, and an output F1 is output from the AND circuit 52, and the photo sensor
31b is at the L level, and the output of the photo sensor 31a is at the H level.
When the level falls from the L level to the L level, it is detected that the suction port main body 5 is retracted, for example, and the output F2 is output from the AND circuit 54.

If the field effect transistor Q2 and the field effect transistor Q4 are turned on at the same time, a series circuit of the transistor Q1 and the field effect transistor Q2 and a series circuit of the transistor Q3 and the field effect transistor Q4 are formed and short-circuited. Since a current flows, after turning off the field effect transistor Q2 or the field effect transistor Q4, the buffer times are set by the flip-flop circuits 47, 48, 49, 50 and the AND circuits 51, 52, respectively. Turn on Q4 or field effect transistor Q2.

When the power is turned on, the AC voltage of the commercial AC power supply E is full-wave rectified by the full-wave rectifier circuit 41, a constant voltage is set by the Zener diode ZD1 and smoothed by the capacitor C1. A DC constant voltage is applied between Q1 and the field effect transistor Q2 and between the transistor Q3 and the field effect transistor Q4.

Photo sensor 31a and photo sensor 31b
Is detected by the moving direction detecting means 46 as the moving direction of the suction port main body 5 in the forward direction, and for one second after the last output from the photosensor 31b, the non-inverted output of the monomultivibrator circuit 55 If an H level output is output from the terminal and the current value flowing through the motor 15 is less than the normal current value, that is, less than 1 A, the monomultivibrator circuit
The output from the inverted output terminal 75 becomes H level, and the output from the AND circuit 52 is made.

When an output is made from the AND circuit 52, a voltage is applied to the gate of the field effect transistor Q2 to turn on the field effect transistor Q2 and a current is supplied to the base of the transistor Q3 to turn on the transistor Q3. When the transistor Q3 and the field-effect transistor Q2 are turned on, a forward current flows through the motor 15, so that the motor
15 rotates forward. In this state, the cleaning blade 12 rotates forward in the running direction of the suction port main body 5 to scrape up dust.

On the other hand, based on the outputs of the photo sensors 31a and 31b, the moving direction detecting means 46 detects that the moving direction of the suction port main body 5 is reversed in the backward direction, and the output from the photo sensor 31b causes An H level output is output from the non-inverting output terminal of the vibrator circuit 55,
The current value flowing through the motor 15 is a normal current value, that is, 1
If it is less than A, the output from the inverted output terminal of the monomultivibrator circuit 75 becomes H level, and the output from the AND circuit 54 is made.

Then, when an output is made from the AND circuit 54, a voltage is applied to the gate of the field effect transistor Q4 to turn on the field effect transistor Q4, and a current is supplied to the base of the transistor Q1 to turn on the transistor Q1. When the transistor Q1 and the field-effect transistor Q4 are turned on, a reverse current flows through the motor 15, so that the motor
15 reverses. In this state, the cleaning blade 12 rotates in the reverse direction to the traveling direction of the suction port main body 5 to scrape up dust.

Further, for example, when the suction port main body 5 is pressed against a floor surface such as a carpet or between boards, the electric motor
, The back electromotive force of the motor 15 decreases, and a relatively small overcurrent of 1 A or more and less than 2 A flows through the motor 15 to increase the current value flowing through the resistor R2.
When it exceeds the set value set by R16 and resistor R17,
The operational amplifier 62 outputs an H level signal and inputs it to the mono multivibrator circuit 63.

The counter circuit 71 and the counter circuit 72 measure 200 counts, for example, 2 seconds. When the load current is 2 seconds or more and less than 2 A, the inverting output terminal of the mono-multivibrator circuit 75 outputs an L-level signal. Then, the signals are input to the AND circuits 52 and 54, the output of each of the AND circuits 52 and 54 becomes L level, and the voltage is applied to both the gates of the field effect transistor Q2 and the field effect transistor Q4. Instead, the motor 15 is stopped. Therefore, deterioration of the electric motor 15 and excessive heating of the electronic components are prevented.

When the moving direction detecting means 46 determines that the moving direction of the suction port main body 5 has been reversed in a state where the load current is 1 A or more, the OR circuit 66 resets the monomultivibrator circuit 63, The counter circuit 71 and the counter circuit 72 reset the count and start counting from 1. Therefore, since the count is reset each time the moving direction is reversed, the motor 15 is prevented from stopping frequently, and the motor 15 is stopped unnecessarily even if the suction port main body 5 is pressed against a carpet or the like for cleaning. Not only improves operability, but also because of the relatively small overcurrent,
Short-time energization hardly causes deterioration of the motor 15 or excessive heating of electronic components.

On the other hand, for example, when the motor 15 is rarely short-circuited, or when the cleaning blade 12
When a large overcurrent of 2 A or more flows through the load 15, the current flowing through the resistor R2 rises, and the resistors R18 and R1
When the value exceeds the set value set in step 9, the operational amplifier 64 also outputs an H level together with the operational amplifier 62, and is input to the mono-multivibrator circuit 65.

Then, the counter circuit 73 measures four counts, for example, 40 ms, and when the load current exceeds 40 ms, the load current is 2 ms.
When the output is greater than or equal to A, the inverted output terminal of the monomultivibrator circuit 75 outputs an L level signal, and inputs the L level to the AND circuit 52 and the AND circuit 54. Then, the motor 15 is stopped without applying a voltage to any of the gates of the field effect transistor Q2 and the field effect transistor Q4. Therefore, when a large overcurrent occurs, the motor 15
The supply of current to the motor 15 is stopped to prevent deterioration of the electric motor 15 and excessive heating of electronic components.

When the load current is 2 A or more, it is conceivable that some relatively large abnormality such as a rare short of the electric motor 15 or a foreign matter may be entangled in the cleaning blade 12. Without resetting the circuit 73, the counter circuit 73 resets the count by starting the electric motor 15, and starts counting from 1. Therefore, since the state where the load current is large is not maintained, the deterioration of the electric motor 15 and the excessive heating of the electronic components hardly occur.

That is, when the motor 15 rarely short-circuits, it usually takes about one second until a fuse (not shown) blows. During this time, a large current flows through each circuit component, and these circuit components are deteriorated, destroyed, or damaged. Vacuum cleaner body 1
The electric current supplied to the motor 15 can be stopped immediately in 40 ms,
Destruction, heating and destruction of other electronic components can be prevented.

In this way, while improving operability, protection of the vacuum cleaner, that is, suppression of deterioration of parts,
It is possible to extend the life of a part and to reduce the number of replacement parts by preventing the failure of another part when one part fails.

The electronic parts for control are generally 4 to 5 parts.
If the current value of A is 100 msec or less, deterioration and damage can be prevented, so even if a current of 2 A flows, the current is cut off in 40 msec. Absent.

As described above, in the present embodiment, when a relatively large abnormality such as a foreign matter is caught in the cleaning blade 12 as a rotating body and the electric motor 15 is locked, the supply current to the electric motor 15 is immediately stopped. 15 can be protected. In addition, since the first set time in the relatively small overcurrent state is longer than the second set time in the large overcurrent state, the motor 15 is inadvertently pressed when the suction port is temporarily pressed against the floor. Does not stop, so that the operability can be improved.

Further, when the moving direction of the suction port main body 5 is reversed, the first set time is reset.
By shortening the first set time, the elements, the electric motor 15 and the like can be more reliably protected. That is, even if the first set time is shortened, the motor 15 will not be stopped carelessly if the suction port main body 5 is inverted during cleaning.

In the above embodiment, the vacuum cleaner having the function of detecting the traveling direction of the suction port main body 5 and inverting the electric motor 15 in accordance with the traveling direction has been described.
The present invention can also be applied to a vacuum cleaner having only such a cleaning blade 12 having no reversing function.

The frequency of the commercial AC power supply E is 50 Hz.
However, it is possible to cope with 60 Hz. In this case, the clock pulse becomes 120 Hz and the clock is output every 8 ms, so that the set times until the stop are 1.7 seconds and 32 ms, respectively.

[0047]

According to the vacuum cleaner of the present invention, when the current value of the electric motor detected by the overcurrent detection means exceeds the first set current value, the overcurrent exceeding the first set current value is applied. measuring the state of the time measuring means, if you passed the first set time or more, which is set to correspond to the first set current value, to stop the motor by interrupting the current supplied to the electric motor, When the current value of the motor detected by the overcurrent detecting means exceeds the second set current value, the time of the overcurrent state exceeding the second set current value is measured by the measuring means, and the second setting is performed. If you lapse is set corresponding to the current value of the first set time shorter than the second set time or more, it stops the current supplied to the motor hand
For stopping the motor by interrupting stage, if the first set current value to continue the operation of the relatively long motor, in the case of the second set current value of the electric motor is stopped in a relatively short time, or and, when the transfer <br/> moving direction detecting means in an overcurrent state corresponding to the first set current value to detect a reversal of the suction inlet main body, resets the measurement of the measuring means, corresponding to the second set current value I
In the overcurrent state, the moving direction detection means
Since the measurement of the measuring means is not reset even if the detection is performed , the motor can be reliably protected from overcurrent, the deterioration of operability can be prevented, and the protection and operability can be both improved.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing control means of one embodiment of a vacuum cleaner according to the present invention.

FIG. 2 is a circuit diagram showing a circuit for driving the electric motor.

FIG. 3 is a perspective view showing the electric vacuum cleaner.

FIG. 4 is a perspective view showing a part of the suction port main body.

FIG. 5 is an exploded perspective view showing the upward direction detecting means.

FIG. 6 is a sectional view showing the same roller.

FIG. 7 is a timing chart showing the operation of the above-described direction detecting means.

[Explanation of symbols]

 5 Suction port body 12 Cleaning blade as a rotating body 15 Electric motor 44 Control means 46 Moving direction detecting means 61 Overcurrent detecting means 66 OR circuit as reset means 67 Reset parts as reset means 70 Measuring means 75 Mono-multi as stopping means Vibrator circuit

Claims (1)

(57) [Claims] 1. A suction port main body, a rotating body provided in the suction port main body, an electric motor for rotating the rotating body, and control means for controlling the electric motor, wherein the control means comprises: a moving direction detecting means for detecting the moving direction of the mouth body, the first set current value, and have a large second set current value from the first set current value, the current value supplied to the electric motor Overcurrent detection means for detecting an overcurrent state exceeding each of said set current values, a first set time set corresponding to said first set current value, and said second set current Set corresponding to the value
Having a second set time shorter than the first set time ;
When in the state of overcurrent detected by the overcurrent detection means
Measuring means for measuring the distance between the first set current value and the first set current value.
When the obtained state has elapsed for the first set time or more, and
And the state exceeding the second set current value is the second set current value.
When a certain period of time has elapsed, the power supplied to the motor
Stopping means for interrupting the flow, and moving in an overcurrent state corresponding to the second set current value.
Even if the direction detecting means detects the reversal of the suction port main body,
Without resetting the measurement of the measuring means, before Symbol the moving direction detecting means said intake overcurrent state corresponding to the first set current value
Vacuum cleaner, characterized in that a resetting means for resetting the measuring meter before Symbol measuring means detects an inversion of the write port main body.