JP2013074997A - Vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum cleaner that can detect foreign objects rolled in even with a rotating brush of a suction tool driven by a suction wind force instead of electrically driven, and remove the foreign objects.SOLUTION: The vacuum cleaner includes: an inverter circuit 9; a control device 11 for controlling the inverter circuit 9; a brushless electric blower 2 driven by the inverter circuit 9; a rotating brush 7 provided in a suction tool 6, and driven by the suction force from the brushless electric blower 2; a rotating speed detector 8 for detecting a rotating speed of the rotating brush 7; and a comparison device 10 for comparing the rotating speed of the rotating brush 7 detected by the rotating speed detector 8 and a rotating speed information signal of the brushless electric blower 2 output from the invertor circuit 9. The control device 11 controls the rotating speed of the brushless electric blower 2 based on a comparison signal from the comparison device 10 to thereby detect a foreign object rolled in and lower the rotation of the rotating brush to remove the foreign object.

Description

  The present invention relates to a brushless electric blower that is controlled in response to a rotation signal of a rotary brush built in a suction tool in a general household or business use vacuum cleaner.

A conventional rotating brush of a vacuum cleaner is as shown in FIG.
In FIG. 6, a load current detection circuit 78 including two operational amplifiers 132, an operational amplifier 138, etc., a capacitor 141 as a timing means provided in the load current detection circuit 78, and a time constant of the capacitor 141 when the motor 43 is short-circuited. Is provided, and when the motor 43 is locked, the outputs of the two operational amplifiers 132 and 138 are inverted from Low to HIGH, and power supply to the motor 43 is stopped. Further, when the motor 43 is short-circuited, the capacitor 141 is rapidly charged by the operation of the transistor 144 and the transistor 146 of the short-circuit detection circuit 79 due to a short-circuit current, and the output of the operational amplifier 138 is inverted from LOW to HIGH to supply power to the motor 43. Some stopped (for example, see Patent Document 1).

JP-A-6-78866

  In the above-described prior art, for example, in a vacuum cleaner provided with a suction tool having a rotating brush that is driven by receiving suction wind force from an electric blower, the rotating brush is not driven by the motor, so the current of the motor is detected, The electric motor was controlled based on the detection signal, and the rotation of the rotating brush was lowered to prevent the foreign matter from being caught.

  Therefore, the present invention solves the above-described problem, and even with a suction tool having a rotating brush driven by wind power that is not driven by an electric motor, foreign matter is detected by detecting the entrainment of the foreign matter, and removing the foreign matter by reducing the rotation of the rotating brush. An object of the present invention is to provide an electric vacuum cleaner that can be used.

  In order to achieve the above object, the present invention provides an inverter circuit, control means for controlling the inverter circuit, a brushless electric blower driven by the inverter circuit, a suction tool for sucking dust on a surface to be cleaned, A rotary brush provided in the suction tool and driven by the suction wind force from the brushless electric blower, a rotational speed detection means for detecting the rotational speed of the rotary brush, and the rotational speed of the rotary brush detected by the rotational speed detection means And a comparison means for comparing the rotation speed information signal of the brushless electric blower output from the inverter circuit, and the control means controls the rotation speed of the brushless electric blower based on the comparison signal from the comparison means. Is.

Thereby, the rotation speed of the brushless electric blower is controlled by the rotation speed information signal from the rotation speed detection means corresponding to the rotation speed of the rotary brush, and the rotation speed of the rotary brush is also controlled to the optimal rotation speed by this control. In other words, even with a rotating brush driven by suction wind that is not driven by an electric motor, if the inclusion of a foreign object is detected, the rotation speed of the electric blower decreases, and the rotation speed of the rotating brush decreases in synchronization with a decrease in the suction wind power that is the drive source. , Foreign matter and the like caught in the suction tool can be removed.

  Further, the comparison means has a rotation brush rotation speed table corresponding to a rotation speed reduction state due to the load of the rotation brush, sends a signal corresponding to the table value to the control means, and passes the inverter circuit through the inverter circuit. The brushless electric blower may be controlled.

  Further, the comparison means has a threshold value corresponding to the rotational speed of the rotary brush, and in the region of the rotational speed higher than the threshold value, a signal for increasing the rotational speed of the brushless electric blower with respect to a decrease in the rotational speed. On the other hand, a signal for lowering the rotational speed of the brushless electric blower is sent to the control means in the region of the rotational speed lower than the threshold value, and the brushless electric blower is controlled via the inverter circuit. Good.

  According to the present invention, the rotational speed of the brushless electric blower is controlled by the rotational speed information signal from the rotational speed detection means corresponding to the rotational speed of the rotating brush, and the rotational speed of the rotating brush is also optimized by this control. Even if a rotating brush driven by suction wind that is not driven by an electric motor is detected, the rotation of the rotating brush is synchronized with the decrease in the rotational speed of the electric blower and the reduction of the suction wind that is the drive source when detecting the inclusion of foreign matter, etc. The number is also reduced, and foreign substances and the like caught in the suction tool can be removed.

External view which shows the whole structure of the vacuum cleaner in Embodiment 1 of this invention. Schematic showing the internal structure of the vacuum cleaner suction from the side Same as above, control block diagram of rotation speed of brushless electric blower of vacuum cleaner The table figure which shows the rotation speed table and threshold value table of a rotary brush corresponding to the load (floor surface state) of the rotary brush of the brushless electric blower in a vacuum cleaner The flowchart which shows the processing operation of the control means of a vacuum cleaner Entire circuit diagram showing control of a conventional vacuum cleaner

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference symbols throughout the drawings, and redundant description thereof is omitted.

(Embodiment 1)
Embodiment 1 of the present invention will be described below with reference to FIGS.
FIG. 1 is an external view of a vacuum cleaner. In FIG. 1, 1 is a main body of a vacuum cleaner, and 2 includes a brushless electric blower that generates a suction force and a dust collection chamber (not shown) that collects sucked dust. Reference numeral 3 denotes a hose, which has a hand operation unit 4 for switching the operation mode of the electric vacuum cleaner by changing the suction force of the brushless electric blower 2.

  Reference numeral 6 denotes a suction tool for sucking dust on the surface to be cleaned in contact with the floor surface, and has a built-in rotating brush 7 that operates by the wind force of the brushless electric blower 2 that sweeps up dust on the surface to be cleaned. Reference numeral 5 denotes an extension pipe which communicates the suction tool 6 and the hose 3.

  By operating the hand operating unit 4 and driving the brushless electric blower 2, the dust on the surface to be cleaned is scraped up by the rotational drive of the rotating brush 7 in the suction tool 6, and the dust is divided into the extension pipe 5 and the hose. 3 and the vacuum cleaner body 1, the dust is collected in a dust collection chamber (not shown) built in the vacuum cleaner body 1, and suction air is drawn from the vacuum cleaner body 1. Discharged.

FIG. 2 is an internal structure diagram of the suction tool. In FIG. 2, the suction tool 6 includes a rotation brush 7 and a rotation speed detection means 8 that detects the rotation speed of the rotation brush 7.
The rotation speed detecting means 8 is composed of a light emitting element and a light receiving element (not shown). A reflector (not shown) that reflects light is added to an arbitrary portion of the rotating brush 7, and the light emitted from the light emitting element is reflected by the reflector of the rotation speed detecting means 8 and received by the light receiving element. When the rotating brush 7 is being driven by the brushless electric blower 2, the number of rotations of the rotating brush 7 can be detected by integrating the number of light receptions per minute.
In the above description, the rotational speed detection means 8 is composed of a light receiving element and a light emitting element, but other detection means may be used.

  FIG. 3 is a block diagram showing a flow of a control circuit showing the control of the brushless electric blower 2. In FIG. 3, the rotational speed detection means 8 detects the rotational speed of the rotary brush 7 and sends the rotational speed detection result to the comparison means 10. The inverter circuit 9 drives the brushless electric blower 2 and sends the rotational speed information of the brushless electric blower 2 at that time to the comparison means 10. The comparison means 10 compares the rotation speed of the rotary brush 7 from the rotation speed detection means 8 with the rotation speed information signal of the brushless electric blower 2 from the inverter circuit 9, and sends the comparison result to the control means 11. The control means 11 controls the rotation speed of the brushless electric blower 2 via the inverter circuit 9 based on the comparison signal from the comparison means 10.

  Further, the comparison means 10 has a rotation speed table of the rotation brush 7 corresponding to the rotation speed reduction state due to the load of the rotation brush 7 (floor surface state such as floor, tatami mat, carpet, etc.) and controls a signal according to the table value. The rotation speed of the brushless electric blower 2 is controlled via the inverter circuit 9.

  Further, the comparison means 10 has a threshold value for the number of rotations of the rotary brush 7, and in the region of the number of rotations higher than the threshold value, the signal for increasing the number of rotations of the brushless electric blower 2 with respect to the decrease in the number of rotations is controlled as described above. On the other hand, in the region of the rotational speed lower than the threshold value, a signal for lowering the rotational speed of the brushless electric blower 2 is sent to the control means 11 to control the rotational speed of the brushless electric blower 2 via the inverter circuit 9.

  FIG. 4 is a rotation brush rotation speed table for each load condition of floor, tatami, carpet, and threshold according to the rotation speed of the brushless electric blower 2. The threshold value is set so that it is possible to determine whether or not a foreign object has been caught when the rotation number of the rotating brush has decreased to a value equal to or less than the threshold value.

  When the rotational speed of the rotating brush 7 falls due to the inclusion of foreign matter and falls below a threshold value set corresponding to the rotational speed of the brushless electric blower 2 and the rotational speed table of the rotating brush corresponding to the load condition, the rotating brush 7 determines that a foreign object is involved.

  That is, based on the number of rotations of the brushless electric blower 2 and the number of rotations of the rotating brush 7, it is possible to determine whether the load of the rotating brush is floor, folding, carpet, or less than a threshold value (detection of foreign matter inclusion). The rotation speed of the brushless electric blower can be arbitrarily set by the user of the vacuum cleaner.

Next, specific control means will be described.
FIG. 5 is a flowchart showing the processing operation of the comparison means 10 in FIG. Specific control means will be described for each of the rotating brush floor, folding, carpet, and threshold load conditions with reference to FIGS. 3, 4, and 5. Note that the initial setting values of the rotation speed of the brushless electric blower are all 60000 rpm.

  In the table of FIG. 4, specific control will be described with reference to FIGS. 3, 4, and 5 when the load of the rotating brush is the floor. In FIG. 5, the comparison means first obtains the rotational speed 60000 rpm of the brushless electric blower 2 from the inverter circuit 9 of FIG.

  Next, the rotational speed of the rotary brush 7 is acquired from the rotational speed detection means 8 of FIG. Here, since the load of the rotary brush 7 is a floor, 1800 rpm is acquired. Subsequently, in the comparison unit 10 of FIG. 3, the rotation speed table of FIG. 4 is referred to, and the rotation speed of the rotary brush 7 is equal to or greater than the threshold value 300 rpm. In the rotary brush load determination, as shown in FIG. 4, since the rotation speed of the rotary brush 7 is 1800 rpm, the load of the rotary brush 7 is determined as the floor.

  The comparison means 10 in FIG. 3 sends an information signal for maintaining the current rotational speed of the brushless electric blower 2 to the control means 11. The control means 11 maintains the rotation speed of the brushless electric blower 2 via the inverter circuit 9 based on the information signal from the comparison means 10.

  In the table of FIG. 4, specific control will be described with reference to FIGS. 3, 4, and 5 when the load of the rotary brush is tatami. In FIG. 5, the comparison means first obtains the rotational speed 60000 rpm of the brushless electric blower 2 from the inverter circuit 9 of FIG. Next, the rotational speed of the rotary brush 7 is acquired from the rotational speed detection means 8 of FIG. Here, since the load of the rotating brush 7 is a tatami mat, 1740 rpm is acquired.

  Subsequently, in the comparison unit 10 of FIG. 3, the rotation speed table of FIG. 4 is referred to, and the rotation speed of the rotary brush 7 is equal to or greater than the threshold value 300 rpm. In the rotary brush load determination, as shown in FIG. 4, since the rotation speed of the rotary brush 7 is 1740 rpm, the load of the rotary brush 7 is determined to be tatami.

  In the control means 11 of FIG. 3, since the rotation speed of the rotary brush 7 is reduced by 3.5% compared to the floor in the tatami load, the rotation speed of the brushless electric blower 2 is increased by 3.5%. Is sent to the control means 11 to raise the number of revolutions to the number of revolutions of the floor load. The control means 11 increases the rotation speed of the brushless electric blower 2 by 3.5% via the inverter circuit 9 based on the information signal of the comparison means 10. Thereby, the optimal rotation speed according to the load of a rotating brush can be given to a rotating brush.

  In the table of FIG. 4, specific control will be described with reference to FIGS. 3, 4, and 5 when the load of the rotating brush is carpet. In FIG. 5, the comparison means first obtains the rotational speed 60000 rpm of the brushless electric blower 2 from the inverter circuit 9 of FIG.

  Next, the rotational speed of the rotary brush 7 is acquired from the rotational speed detection means 8 of FIG. Here, since the load of the rotary brush 7 is a carpet, 1680 rpm is acquired. Subsequently, in the comparison unit 10 of FIG. 3, the rotation speed table of FIG. 4 is referred to, and the rotation speed of the rotary brush 7 is equal to or greater than the threshold value 300 rpm.

In the rotation brush load determination, as shown in FIG. 4, since the rotation speed of the rotation brush 7 is 1680 rpm, it is determined that the load of the rotation brush 7 is “carpet”. The control means 11 in FIG. 3 increases the rotation speed of the brushless electric blower 2 by 7% and reduces the rotation speed of the rotation brush 7 to the floor because the rotation speed of the rotary brush 7 is reduced by 7% in the load of the tatami mat compared to the floor. An information signal for increasing the rotational speed of the load is sent to the control means 11. The control means 11 increases the rotation speed of the brushless electric blower 2 by 7% via the inverter circuit 9 based on the information signal of the comparison means 10. Thereby, the optimal rotation speed according to the load of a rotating brush can be given to a rotating brush.

  In the table of FIG. 4, specific control will be described with reference to FIGS. 3, 4, and 5 when the load of the rotating brush is a threshold value (a state in which foreign matter or the like is involved). In FIG. 5, the comparison means first obtains the rotational speed 60000 rpm of the brushless electric blower 2 from the inverter circuit 9 of FIG. Next, the rotational speed of the rotary brush 7 is acquired from the rotational speed detection means 8 of FIG. Here, since the load of the rotating brush 7 is a load when a foreign object or the like is involved, an arbitrary value of 300 rpm or less is acquired. Subsequently, the comparison means 10 in FIG. 3 refers to the rotation speed table in FIG. 4 and controls the information signal for lowering the rotation speed of the brushless electric blower 2 by 10,000 rpm because the rotation speed of the rotary brush 7 is not more than the threshold value 300 rpm. 11

  The control means 11 reduces the rotational speed of the brushless electric blower 2 by 10000 rpm via the inverter circuit 9 based on the information signal of the comparison means 10. By repeating this flow, as the rotational speed of the brushless electric blower 2 decreases, the rotational speed of the rotating brush 7 also decreases, the force with which the rotating brush 7 entrains foreign matter becomes weak, and the entrainment of foreign matter can be removed.

  With the above control, the optimum rotational speed of the rotating brush according to the load of the rotating brush can be controlled, and foreign matter can be quickly removed even when foreign matter is caught.

  Note that the rotation speed of the rotating brush under the load condition is only a guide and can be set arbitrarily.

  As described above, the vacuum cleaner according to the present invention is effective for a vacuum cleaner whose main purpose is floor cleaning, such as a built-in type (central cleaner) as well as a home cleaner. It can be applied to and deployed in various vacuum cleaners.

DESCRIPTION OF SYMBOLS 1 Electric vacuum cleaner body 2 Brushless electric blower 3 Hose 4 Hand operation part 5 Extension pipe 6 Suction tool 7 Rotating brush 8 Rotation number detection means 9 Inverter circuit 10 Comparison means 11 Control means 43 Electric motor 78 Load current detection circuit 79 Short circuit detection circuit 132 138 Operational amplifier 141 Capacitor 144, 146 Transistor

Claims (3)

From the inverter circuit, the control means for controlling the inverter circuit, the brushless electric blower driven by the inverter circuit, the suction tool for sucking dust on the surface to be cleaned, and the brushless electric blower provided in the suction tool A rotating brush that is driven by the suction wind power, a rotational speed detecting means that detects the rotational speed of the rotating brush, the rotational speed of the rotating brush detected by the rotational speed detecting means, and the brushless electric motor that is output from the inverter circuit A vacuum cleaner comprising comparison means for comparing the rotation speed information signal of the blower, wherein the control means controls the rotation speed of the brushless electric blower based on a comparison signal from the comparison means. The comparison means has a rotational speed table of the rotary brush corresponding to a rotational speed reduction state due to the load of the rotary brush, sends a signal corresponding to the table value to the control means, and the brushless electric motor via the inverter circuit A vacuum cleaner that controls the blower. The comparison means has a threshold corresponding to the rotational speed of the rotating brush, and in the region of the rotational speed higher than the threshold, the control signal for increasing the rotational speed of the brushless electric blower with respect to the decrease in the rotational speed On the other hand, a vacuum cleaner that sends a signal to the control means to lower the rotational speed of the brushless electric blower in the region of the rotational speed lower than the threshold value.