JP3861394B2 - Vacuum cleaner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vacuum cleaner that detects the current of an electric blower and controls the suction force of the electric blower.
[0002]
[Prior art]
One of the performance measures of vacuum cleaners is “suction power”. The suction work rate is calculated as constant * air volume * degree of vacuum, but as shown in Fig. 10, the suction work rate reaches a peak when there is a certain air volume, and when the air volume is large as shown in a parabola, the air volume is small. In some cases, the suction work rate decreases. In addition, the actual vacuum cleaner is designed to perform at a flow rate near the peak of the suction power.
[0003]
In Japan (Japan), there are restrictions such as JIS standards, and it is necessary to limit the rated power consumption to 1 kW or less.
[0004]
However, in the electric blower, when the dust accumulates and the air volume decreases as shown in FIG. 10, the power consumption decreases. Therefore, in recent years, vacuum cleaners that control power so as to maximize the power consumption with the air volume that maximizes the suction work rate have been proposed and become mainstream.
[0005]
Conventionally, this type of vacuum cleaner generally has a configuration as shown in FIGS. Hereinafter, the configuration will be described.
[0006]
As shown in FIGS. 7 and 9, the vacuum cleaner main body (hereinafter referred to as “main body”) 1 includes an electric blower 2, and a hose 4 having a hand operating portion 6 is connected to the suction port 3. The extension pipe 7 and the suction tool 8 are connected to the. Reference numeral 5 denotes current detection means for detecting a current supplied to the electric blower 2. Reference numeral 11 denotes phase control means for setting the phase control amount of the electric blower 2 according to the detection result of the current detection means 5 and the set value of the hand operation unit 6, and 12 denotes the electric blower 2 based on this control result. The electric blower 2, the current detection means 5, and the drive means 12 are drive means, and are connected in series between the AC power supplies 10.
[0007]
The operation of the above configuration will be described with reference to FIG.
[0008]
At the present point A, if the air volume drops momentarily for some reason, the input drops to point B in FIG. The output of the current detection means 5 decreases to the point B in FIG. 8A, and the phase control amount is set to the point B in FIG. 8B to increase the input. As the input increases, the output of the current detection means 5 increases, delaying the phase control amount and decreasing the input. Eventually, it stabilizes at the air volume C point due to the wind path load resistance. Thus, as shown in FIG. 8C, when the input-air volume characteristic is made the air volume as a parameter and the output of the current detection means 5 is associated with the control phase amount, the output of the current detection means 5 is as shown in FIG. The control phase amount changes as shown in FIG. When the suction tool 8 is blocked by paper or the like, or when dust accumulates in the dust collection chamber 9, the air volume decreases, and the input can be controlled to the maximum.
[0009]
Moreover, if the suction tool 8 is operated while it is blocked or if the dust collection chamber 9 is operated for a long time while the dust collecting chamber 9 is full, the electric blower 2 is abnormally heated, so that an air protector (not shown) is used. Some were operated to take in outside air and prevent the abnormal heating.
[0010]
[Problems to be solved by the invention]
There is a problem that the maximum power consumption point D shown in FIG. 8C varies due to variations in the electric blower and main body performance. When the air blower 2 is used to prevent abnormal heating of the electric blower 2, the operating point of the air protector is generally set based on the “strong” operation mode. Therefore, when used in “medium” and “weak” operation, the air protector does not operate even when the suction tool 8 is blocked, and the electric blower 2 is heated abnormally. An object of the present invention is to solve the above-described problems, and an object of the present invention is to prevent an excessive temperature rise by operating an air protector even when used in a low power mode.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, an electric vacuum cleaner according to the present invention includes an electric blower for suction, current detection means for detecting a current flowing through the electric blower, and an output of the current detection means. A phase control means for controlling the electric power of the electric blower, and having a plurality of control modes with different maximum powers, and in the low power mode, the mode is shifted to the control of the high power mode when the air volume is low. As a solution, even when sealed, it has a high power mode, a strong suction force is obtained, and the air protector operates to prevent an excessive temperature rise.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The invention of claim 1, wherein the present invention is provided with a phase control means for controlling the input of the electric blower and the electric blower for sucking and current detecting means for detecting a current of the electric blower by the output of said current detecting means It has a plurality of control modes with different maximum power, and it is a problem-solving means to shift to the control of the high power mode when the air flow is low in the low power mode, and it becomes a high power mode even when sealed A suction force is obtained, the air protector operates, and has an effect of preventing an excessive temperature rise.
[0013]
【Example】
Example 1
Embodiment 1 of the present invention will be described below with reference to FIG. In addition, the same code | symbol is provided about the part same as a prior art example, and the detailed description is abbreviate | omitted.
[0014]
As shown in FIG. 1 (c), when the output of the current detection means 5 is made to correspond to the control phase amount using the air volume as a parameter so as to be constant power at the maximum power (range A), the output of the current detection means 5 As shown in FIG. 1A, the control phase amount has characteristics as shown in FIG. For example, the correspondence of such nonlinear characteristics may be stored as a numerical table by a microcomputer or the like. By controlling the power consumption to be constant, the power control accuracy at the maximum power consumption can be improved.
[0015]
(Example 2)
Next, Embodiment 2 of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
[0016]
When the air volume changes as shown in FIG. 2 (a), the output of the current detection means 5 is controlled with respect to the minimum resolution value obtained by A / D conversion as shown in FIG. 2 (b). The phase is made to correspond one to one. Since it corresponds to the minimum resolution value, there is no more accuracy. The accuracy of the power control of the air volume-power characteristic shown in FIG. 2C can be improved. Needless to say, the finer the resolution of A / D conversion and the finer the control phase, the better the accuracy of power control.
[0017]
Example 3
Next, Embodiment 3 of the present invention will be described with reference to FIG. In addition, the thing of the same structure as the said Example attaches | subjects the same code | symbol, and abbreviate | omits the detailed description.
[0018]
In FIG. 3, a plurality of control modes A and B having different maximum powers are provided, A performs the control to obtain the maximum suction performance, and B has a low power to reduce the operating force of the suction tool 8 and the like by moderate suction. Mode. This mode is selected and used by the user according to preference. In general, when the dust bag 9 is full of dust or the suction port 3 is blocked, an air protector that flows in the air on the suction side of the electric blower 2 from the outside to prevent the electric blower 2 from overheating ( (Not shown) is provided. Since the air protector may not operate even if it is sealed in the control of mode B in consideration of operability, when the output of the current detection means 5 at point C is detected, the control mode is shifted to the control mode A with high power. Then, the air protector operates at the point E, and has an effect of preventing an excessive temperature rise. When the output of the current detection means 5 at the point D is detected, the control is returned to the original B control, so that the normal usability can be obtained in the mode B of the normal moderate suction force when not sealed.
[0019]
Example 4
Next, Embodiment 4 of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
[0020]
In FIG. 4A, a plurality of control modes A and B having different maximum powers are provided. A controls the maximum suction performance, and B is a mode with low power in order to lighten the operating force of the suction tool 8 and the like with moderate suction. This mode is selected and used by the user according to preference. The range c is a fixed phase, and the power decreases as the air volume decreases. When the mode is switched, the control phase shown in FIG. 4B is set to the lower limit value (point a is set to point b ′ and point b is set to point a ′) with respect to the current operating air volume (shown by a broken line). . Then, the power becomes the lowest power point in different modes outside the control range c, and settles at the operating air volume (the point a ′ is at the point a and the point b ′ is at the point b). Since the electric power is switched from the lower one, the burden on the electric blower 2 and the noise can be kept low.
[0021]
(Example 5)
Next, a fifth embodiment of the present invention will be described with reference to FIGS.
[0022]
The electric blower 2 and the bidirectional thyristor 12 connected in series between the AC power supply 10 terminals and the gate current of the bidirectional thyristor 12 are supplied by the photo bidirectional thyristor 13. The phase control circuit 11 is connected to the side. 6A shows the AC power supply, FIG. 6B shows the control phase of the bidirectional thyristor 12 that controls the electric blower 2, and FIG. 6C shows the voltage across the electric blower 2. In FIG. 6, when the control phase amount is short (T1), the conduction time of the photo bidirectional thyristor 13 is increased (t1) in order to secure a gate current with a small voltage when the bidirectional thyristor 12 is fired. To do. Conversely, when the control phase amount is long (T2), the voltage at the time of firing of the bidirectional thyristor 12 is high and the gate current is secured, so that the conduction time of the photo bidirectional thyristor 13 is shortened (t1). Good. On average, when the control phase amount is long, the current can be saved by shortening the conduction time of the photo bidirectional thyristor 13 by the phase control circuit 11.
[0023]
【The invention's effect】
According to the first aspect of the present invention, in the low power mode, when the air volume is low, the control shifts to the high power mode, and even when sealed, the high power mode is obtained and a strong suction force is obtained. Operates and has the effect of preventing excessive temperature rise.
[Brief description of the drawings]
FIG. 1 (a) Current detection means output V-air volume Q characteristic diagram of a vacuum cleaner in Embodiment 1 of the present invention (b) Control phase S—Current detection means output V characteristic diagram of the vacuum cleaner (c) FIG. 2 (a) Current detection means output V-air volume Q characteristic diagram of the vacuum cleaner in Embodiment 2 of the present invention (b) Control phase of the vacuum cleaner S-Current detection means output V characteristic diagram (c) Electric power W-air volume Q characteristic diagram of the electric vacuum cleaner FIG. 3 (a) Electric power W-air volume Q characteristic diagram of the vacuum cleaner in Example 3 of the present invention. b) Current detection means output V-air quantity Q characteristic diagram of the vacuum cleaner FIG. 4 (a) Electric power W-air quantity Q characteristic diagram of the vacuum cleaner in Example 4 of the present invention (b) Control phase S vs. current detection means output V characteristic diagram [Fig. 5] Fig. 6 is a circuit diagram in Embodiment 5 of the present invention. The figure which shows the alternating current power supply in Ming of Example 5 (b) The figure which shows the control phase of the vacuum cleaner (c) The both-ends voltage diagram of the electric blower of the vacuum cleaner [FIG. 7] The circuit diagram of the conventional vacuum cleaner 8A is a current detection means output V-air volume Q characteristic diagram of a conventional vacuum cleaner. FIG. 8B is a control phase S-current detection means output V characteristic diagram of the vacuum cleaner. FIG. Input W vs. airflow Q characteristics diagram [Fig. 9] Perspective view of vacuum cleaner [Fig.10] Input / vacuum level / suction power-airflow characteristics diagram of conventional vacuum cleaner [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Electric vacuum cleaner body 2 Electric blower 5 Current detection means 11 Phase control means

Claims (1)

  An electric blower for suction, current detection means for detecting the current flowing through the electric blower, and phase control means for controlling the electric power of the electric blower according to the output of the current detection means, differing in maximum power A vacuum cleaner that has a plurality of control modes, and that shifts to the control of the high power mode when the air flow is low in the low power mode.

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