JP3303450B2 - 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 control means for controlling the suction force of an electric blower by detecting the amount of dust sucked in or the temperature of the electric blower.

[0002]

2. Description of the Related Art A conventional vacuum cleaner of this type is shown in Japanese Utility Model Publication No. 47-14378. FIG.
8 has an operation knob 117 for changing the variable resistor 128, does not fix the setting position of the knob in a control range larger than the rated speed of the electric motor 102, and in the control range, the knob 117 always operates at the rated speed. A variable resistor 113 configured to be energized by a spring or the like so as to return to the following control range indicates the vacuum cleaner inserted into the roll call control circuit of the semiconductor element 106 for controlling the speed of the electric motor. .

[0003]

In such a conventional vacuum cleaner, when dust is clogged in the suction hose or when it is necessary to suck a particularly heavy object, the dust that has entered the eyes of the tatami mats and gaps is further reduced. It is an object of the present invention to prevent the motor from being overheated by easily setting the output to a value higher than the rated output in advance and temporarily using the output at the time of inhalation.

However, in the above-described conventional configuration, since the user judges when a particularly strong suction force is required as described above and sets it to a state higher than the rating, the user needs to unnecessarily set the operating knob. There is a problem that if the speed is maintained at a value higher than the speed, the motor may be broken.

The present invention has been made to solve the above-mentioned problems, and it is possible to obtain the maximum output of an electric blower of a vacuum cleaner when necessary, and to prevent a failure due to long-term operation in a state near a limit. It is.

[0006]

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
Of the electric vacuum cleaner of the present invention, the electric blower to the suction of dust as the first invention, detecting means for detecting the amount of dust is provided in the suction passage, in response to a signal from the dust detecting means A control unit for controlling the suction force of the electric blower is provided, and the control unit further includes a maximum suction force and a suction force less than the maximum suction force while a signal for maximizing the suction force of the electric blower is output from the dust detection unit. A control circuit for alternately controlling the electric blower is provided.

A second aspect of the present invention comprises an electric blower for sucking dust, control means for controlling a suction force of the electric blower, and sensor means for detecting a temperature of the electric blower or its vicinity. The control means is further provided with a control circuit which varies a maximum suction force of the electric blower or a continuous operation time at the maximum suction force in accordance with a signal from the sensor means.

[0008]

[Action] In the configuration described above, in the first aspect, when detecting a very large amount of dust by the dust detection means,
The operation of the electric blower is alternately repeated between a high output state until it is not desirable to use it continuously and a state where the output has dropped to a level where there is no risk of failure even if it is used continuously. The combination of the state close to the limit of the electric blower and the cooling state
It is possible to obtain the limit suction force of the electric blower for a relatively long time while preventing a failure.

In the second invention, as the temperature detected by the electric blower or a sensor for detecting the temperature in the vicinity of the electric blower increases, the upper limit of the time during which the maximum suction force or the maximum suction force is exhibited is reduced. As a result, a large output close to the limit just before the electric blower is overheated can be obtained while preventing the failure of the electric blower.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a vacuum cleaner main body, which incorporates an electric blower 2, and sucks dust from a floor nozzle 3 into a dust collection chamber 6 through an extension pipe 4 hose 5. Dust chamber 6
Inside, a permeable paper bag 7 is attached. Reference numeral 8 denotes a control circuit for controlling the electric blower 2 built in the main body 1;
As shown in FIG. 5, according to the amount of dust detected by a dust detection unit (hereinafter referred to as a dust sensor) 10 that detects the amount of dust passing through the hose 5 by a transmission type photocoupler provided at the proximal end 9 of the hose 5. The operation of the electric blower 2 is controlled by changing the conduction angle of the bidirectional thyristor 11 to increase as the amount of dust increases.

FIGS. 3A and 3B are time charts showing an embodiment of the first invention. FIG. 3A shows the amount of dust detected by the dust sensor over time, and FIG. The input of the electric blower controlled by the control circuit is shown. T
1, T2 to T5 are set so that the input of the electric blower is controlled to increase as the amount of dust detected by the dust sensor increases, and the maximum input is set at T4 and T5. Next, the dust amount becomes T5 or more in T6 to T9 and continues to be a large value so that the input of the electric blower keeps the maximum value. However, the input of the electric blower is controlled to be smaller than the maximum value with the time TMAX as a limit. It is.

FIGS. 4A and 4B are time charts showing an embodiment of the second invention. FIG. 4A shows the amount of dust detected by the dust sensor over time, and FIG. The input of the electric blower controlled by the control circuit is shown. T
11, T12 to T15 are set so that the input of the electric blower is controlled to increase as the amount of dust detected by the dust sensor increases, and the maximum input is set at T14 and T15. Next, if the amount of dust becomes T15 or more in T16 to T19 and continues to be a large value so that the input of the electric blower continues to be the maximum value, the input of the electric blower changes the maximum value and a value smaller than the maximum value to time Ta. The control is repeated so that the input is reduced when the amount of dust is reduced.

5 and FIGS. 6A and 6B show a third embodiment of the present invention, which is different from the first and second embodiments in that a temperature sensor 12 for detecting a temperature is provided near an electric blower as shown in FIG. 6A and 6B, when the amount of dust is large, the time limit at which the electric blower is operated at the maximum input / output is T.
The control circuit is configured so that MAXL or the upper limit of the input is set to WMAXL, and when Tc is high, the control circuit is set to be low like TMAXH and WMAXH. The failure can be prevented.

[0014]

As apparent from the above description of the embodiment,
According to the vacuum cleaner of the present invention, when the maximum suction force that can be output by the electric blower is increased to a level that cannot be continuously used in the first invention and used, a level can be continuously used with a cooling effect. By repeating the state in which the input is dropped and the maximum state, it is possible to obtain the maximum suction force with the maximum input and output while preventing failure.

In the second invention, when the temperature in the vicinity of the electric blower is high, the control circuit is configured so as to lower the maximum operation time of the input / output or the upper limit of the input / output, and to reduce the power in the cold state. While maximizing its use, it can enhance the temperature protection during heat and prevent failure.

[Brief description of the drawings]

FIG. 1 shows a vacuum cleaner according to the present invention.

FIG. 2 is a diagram showing a configuration of the electric vacuum cleaner.

FIG. 3A is a time chart showing an embodiment of the vacuum cleaner of the first invention of the present invention; FIG. 3B is a time chart showing an embodiment of the vacuum cleaner;

4A is a time chart showing an embodiment of the vacuum cleaner of the second invention of the present invention, and FIG. 4B is a time chart showing an embodiment of the vacuum cleaner.

FIG. 5 is a view showing a vacuum cleaner according to a third invention of the present invention.

FIG. 6A is a time chart showing an embodiment of the vacuum cleaner. FIG. 6B is a time chart showing an embodiment of the vacuum cleaner.

FIG. 7 is a diagram showing a configuration of a conventional vacuum cleaner.

FIG. 8 is a diagram showing a configuration of the electric vacuum cleaner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vacuum cleaner main body 2 Electric blower 3 Floor nozzle 4 Extension pipe 5 Hose 6 Dust collection chamber 7 Paper bag 8 Control circuit 9 Hand part 10 Dust sensor 11 Bidirectional thyristor 12 Temperature sensor

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-2-307419 (JP, A) JP-A-59-118126 (JP, A) JP-A-61-280832 (JP, A) (58) Investigation Field (Int.Cl. ⁷ , DB name) A47L 9/28

Claims (2)

(57) [Claims] 1. An electric blower for sucking dust, a dust detecting means provided in a suction passage for detecting an amount of dust, and controlling a suction force of the electric blower according to a signal from the dust detecting means. Control means, the control means further controls the electric blower alternately with the maximum suction force and a suction force less than the maximum suction force while the signal for maximizing the suction force of the electric blower is output from the dust detection means. Become a vacuum cleaner. Wherein the electric blower for sucking dust, adsorption
Dust detection means provided in the entrance passage for detecting the amount of dust
And a control means for controlling a suction force of the electric blower in accordance with an amount of dust detected by the dust detection means ; and a sensor means for detecting a temperature of the electric blower or the vicinity thereof, wherein the dust detection means The electric transmission according to the signal from
When operating the blower at the maximum suction force,
The time when the blower was operated at the maximum suction force exceeded the specified time
In this case, the suction force of the electric blower is reduced.
, The value of said maximum suction force and said predetermined time is variable to that electric vacuum cleaner in accordance with a signal from said sensor means.