JP2992303B2 - Electric vacuum cleaner - Google Patents

Description

The present invention relates to an electric blower, a sensor for detecting a change in a vacuum cleaner operation state, and control for controlling the electric blower in response to a detection value of the sensor. And a vacuum cleaner comprising:

[Conventional technology]

Conventionally, an electric vacuum cleaner that performs an automatic control operation, that is, an electric vacuum cleaner that detects a change in the operation state of the vacuum cleaner with a sensor and controls the electric blower in response to a detection value of the sensor has been conventionally used. It is known to control the output of an electric blower according to the detection value of a pressure sensor, as described in JP-A-61-280831.

[Problems to be solved by the invention]

However, in the above-described prior art, one type of operation characteristic is used for the surfaces of the cleaner to be cleaned, such as foldable, yuka, and jiyutan, which are different from each other. There is a regret lacking consideration in terms of detailed control, and as a result, the suction performance corresponding to each of the surfaces to be cleaned cannot be said to be sufficient, and if this point is improved, automatic control operation is performed. The suction performance of the seed vacuum cleaner is further improved than before.

An object of the present invention is to automatically determine the respective surfaces to be cleaned even when cleaning various surfaces to be cleaned having different properties, such as folding, yuka, jiyutan, etc., and preset the surfaces to be cleaned. The optimum driving characteristics for each surface to be cleaned are automatically detected from the driving characteristics, and automatic control operation is performed based on the detection result, and fine control is performed based on the suction performance corresponding to each surface to be cleaned. be able to,
It is to provide an improved vacuum cleaner.

[Means for solving the problem]

The object is to provide a vacuum cleaner including an electric blower, a sensor that detects a change in a vacuum cleaner operating state, and a control unit that controls the electric blower in response to a detection value of the sensor. A plurality of operating characteristics corresponding to the plurality of operating characteristics, and a threshold is provided as a reference for judging the type of the surface to be cleaned for each predetermined airflow value in the plurality of operating characteristics. Determines the type of the surface to be cleaned from the range of change in pressure when the reciprocating operation is performed on the surface to be cleaned, and based on the result of the determination, the current driving characteristic is used to obtain another driving characteristic corresponding to the type of the surface to be cleaned. This is achieved by providing means for automatically selecting and switching.

[Action]

The operating characteristics of the vacuum cleaner corresponding to the type of surface to be cleaned are:
One operation characteristic is realized by combining a constant air volume operation, a constant vacuum operation, and a constant rotation operation of the electric blower with respect to the air volume-vacuum degree curve representing the suction performance of the vacuum cleaner. Then, a plurality of operating characteristics are prepared in advance by changing and combining the values of the constant air volume, the constant vacuum degree, and the constant rotation. Here, an example of the vacuum cleaner operating characteristics is shown in FIG. That is, FIG. 1 is a vacuum degree-air volume characteristic diagram showing an example of the operation characteristics of the vacuum cleaner of the present invention.

In FIG. 1, is for the operating characteristic A WaYuka, this is a constant air volume Q ₄ combination and have summer and constant degree of vacuum H _2, a constant vacuum degree H ₁ operating in air volume Q ₁ or less.

Similarly, the operating characteristics B are for folding and C are for jiutatan.
The characteristics of the oblique line between Q ₁ and Q ₂ indicate the constant rotation operation characteristics of the electric blower.

Then, the in any operating characteristics, in the air volume Q ₁ or less is summer and operating certain degree of vacuum H _1. That is, the air volume
Q ₁ The following is an area where the air volume is reduced by filter th jamming of the cleaner, because it is not a common range when vacuum cleaner use, driving characteristics is also unify.

The constant air volume, the constant vacuum degree, and the constant rotation operation of the electric blower will be described in the following embodiments.

Next, a description will be given of a means for appropriately judging and selecting the plurality of operating characteristics and switching the operating characteristics to the optimal operating characteristics for each surface to be cleaned.

That is, when the suction port reciprocates on the surface to be cleaned when using the vacuum cleaner, the degree of close contact between the suction port and the surface to be cleaned changes, and the degree of vacuum inside the vacuum cleaner, the current of the electric blower, and the suction air volume of the electric blower. Are changed, and these changes are regarded as the operation state changes of the vacuum cleaner.

The amount of change in the degree of vacuum, current, and air flow due to the reciprocating operation of the suction port of the vacuum cleaner pays attention to the fact that, when the same suction port is used, the amount of change varies depending on the surface to be cleaned. It determines what the cleaning surface is and switches to the driving characteristic corresponding to the result of the determination.

The above is described in more detail with reference to FIG. 2. In FIG. 2, the load variation when the suction port is reciprocated on the surface to be cleaned is superimposed on the vacuum degree-air volume characteristic diagram shown in FIG. FIG.

In FIG. 2, when the surface to be cleaned is smooth, the load curve of the vacuum cleaner changes between the lines a and b when the cleaner suction reciprocates on the smooth surface. When the surface to be cleaned is a folding surface, the load curve of the suction opening changes between the lines a and c when the cleaner suction reciprocates on the folding surface. Further, when the surface to be cleaned is gradually folded, the load curve of the vacuum cleaner changes between the line a and the line b when the cleaner suction reciprocates on the surface. Therefore, when the vacuum cleaner is operated with the operation characteristic A and is cleaning the surface, the operating point on the operation characteristic A is the constant air volume Q ₄
It is between point A and point B under control. Then, at this time, the degree of vacuum changes between H and H due to the reciprocating operation of the cleaner inlet, and the degree of change in the degree of vacuum becomes V. Also,
When the vacuum cleaner is operated with the operation characteristic A and is cleaning the folding surface, the degree of change in the degree of vacuum on the operation characteristic A is W. Further, if the vacuum cleaner is operated with the driving characteristic A,
When the smooth surface is being cleaned, the degree of change in the degree of vacuum on the operation characteristic A is X. As described above, when the air volume of the vacuum cleaner is constant, it is possible to determine what the surface to be cleaned is based on the difference in the degree of change in the degree of vacuum. Even clean the same Carpets, the vacuum change width in the case of constant air volume value Q ₂ Z, also in the case of constant air volume value Q ₃ differs from the Y (this is the same tatami, further The same can be said for cleaning the same yuka), but in such a case, even if the surface to be cleaned is the same, the determination threshold value may be determined for each constant airflow value. Optimal control for the surface to be cleaned can be performed.

It should be noted that the change in the air flow and the current during the constant vacuum operation can be used as the change in the vacuum cleaner operation state during the constant rotation operation.

〔Example〕

Hereinafter, the present invention will be described with reference to FIG. 3, which is a control block diagram showing an embodiment of the vacuum cleaner of the present invention.

In this embodiment, a DC brushless motor is used as the electric motor, and the number of revolutions is varied by inverter control.

In FIG. 3, a commercial power supply (AC 100 V) supplied from an outlet (not shown) is rectified to DC by a converter unit 1 and supplied to an inverter unit 3 via a current detection unit 2. The inverter section 3 generates a three-phase alternating current based on the ignition signal from the main control circuit 4 and supplies the three-phase alternating current to the brushless motor 5. The brushless motor 5 has a rotor position sensor 6, and the position of the rotor is fed back to the main control circuit 4. Further, a pressure sensor 7 for detecting the degree of vacuum inside the vacuum cleaner is connected to the main control circuit 4.

In the above configuration, when the vacuum cleaner is to be operated at a constant air flow rate, the air flow rate sensor may be used and the output of the air flow rate sensor may be used to perform negative feedback control on the rotation speed of the brushless motor 5, but in this embodiment, Since the airflow sensor is not provided, the motor rotation speed is calculated from the current value from the current detection unit 2 and the rotor position sensor 6, and these values are calculated to obtain the airflow, and the calculated airflow is used. Perform constant air volume operation.

For the constant vacuum operation and the constant rotation speed operation, a pressure sensor 7 and a rotor position sensor 6 are provided, respectively.
With the above configuration, while constantly monitoring the degree of vacuum, air flow, and the current value of the electric motor as the amount of change in the operating state of the vacuum cleaner, the discrimination of the surface to be cleaned and switching of the vacuum cleaner operation characteristics are performed. Do it.

[Effects of the Invention] The present invention is as described above, and as is apparent from the description of the illustrated embodiment, according to the present invention, various cleaning surfaces having different properties such as fold, yuka, and jyutan are provided. Even in the case of cleaning, the change of the operation state of the cleaner due to the change in the load of the suction port of the cleaner is automatically detected, and the respective surfaces to be cleaned are automatically determined. The most suitable operation characteristics are automatically detected, the automatic control operation is performed based on the detection result, and fine control can be performed by the suction performance corresponding to each surface to be cleaned.

In particular, according to the present invention, even when cleaning the same
Degree of vacuum changes width, in the case of constant air volume value Q ₂ Z, also in the case of constant air volume value Q ₃ differs from the Y (Note this is, as described above, the same tatami, further clean the same floor However, in such a case, even in the case of the same surface to be cleaned, the determination threshold value may be determined for each constant air volume value. Fine-grained control that is optimal for

[Brief description of the drawings]

The drawings show an embodiment of the present invention, FIG. 1 is a vacuum degree-air volume characteristic diagram showing an example of the operation characteristics of the vacuum cleaner of the present invention, and FIG. 2 is a vacuum degree-air volume characteristic diagram shown in FIG. On the other hand, the load variation when the suction port is reciprocated on the surface to be cleaned is superimposed, and FIG. 3 is a control block diagram of the vacuum cleaner of the present invention. DESCRIPTION OF SYMBOLS 1 ... Converter part, 2 ... Current detection part, 3 ... Inverter part, 4 ... Main control circuit, 5 ... Brushless motor, 6 ... Rotor position sensor.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hisanori Toshima 1-1-1, Higashitaga-cho, Hitachi City, Ibaraki Prefecture Inside the Taga Plant of Hitachi, Ltd. (72) Mitsuhisa Kawamata 1-1-1, Higashitaga-machi, Hitachi City, Ibaraki Prefecture No. 1 Inside the Taga Plant of Hitachi, Ltd. (72) Inventor Haruo Oharaki 4026 Kuji-cho, Hitachi City, Ibaraki Prefecture Inside of Hitachi Research Laboratory, Hitachi, Ltd. (72) Kazuo Tahara 4026 Kuji-cho, Hitachi City, Ibaraki Hitachi, Ltd. Inside Hitachi, Ltd. (72) Inventor Tsunehiro Endo 4026 Kuji-cho, Hitachi City, Ibaraki Prefecture Inside Hitachi Research Laboratory, Hitachi, Ltd. (72) Kunio Miyashita 4026 Kuji-machi, Hitachi City, Ibaraki Prefecture, Hitachi Research Laboratory, Hitachi, Ltd. 72) Inventor Toshiyuki Yasushima 4026 Kuji-cho, Hitachi City, Ibaraki Prefecture Hitachi, Ltd. (72) Inventor Takeshi Abe 4026 Kuji-cho, Hitachi City, Ibaraki Prefecture Inside Hitachi, Ltd.Hitachi Research Laboratory, Ltd. (72) Inventor Atsushi Hosokawa 1-1-1, Higashitagacho, Hitachi City, Ibaraki Prefecture, Hitachi, Ltd. 56) References JP-A-64-64616 (JP, A) JP-A-60-5795 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) A47L 9/28

Claims (1)

(57) [Claims] An electric vacuum cleaner comprising: an electric blower; a sensor for detecting a change in the operation state of the cleaner; and a control unit for controlling the electric blower in response to a detection value of the sensor. It has a plurality of operating characteristics corresponding to the type, and provides a threshold value as a reference for determining the type of the surface to be cleaned for each predetermined airflow value in the plurality of operating characteristics,
At each threshold value, the type of the surface to be cleaned is determined from the pressure change width when the cleaner suction reciprocates on the surface to be cleaned, and the result of the determination corresponds to the type of the surface to be cleaned from the current driving characteristics. A vacuum cleaner comprising means for automatically selecting / switching to another driving characteristic.