JP3178681B2 - 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 for controlling a current value flowing through an electric blower.

[0002]

2. Description of the Related Art Conventionally, a vacuum cleaner having a built-in electric blower is designed so that the electric blower can input a larger electric power in order to improve a suction power.

[0003]

However, as shown in FIG. 4, when the suction air flow increases and the current value A exceeds a predetermined value, the suction power B does not increase even if the current value A is increased. On the contrary, there is a problem that the energy is reduced and the energy is lost.

[0004] The present invention has been made in view of the above problems, and has as its object to provide an electric vacuum cleaner that saves energy without lowering the suction power.

[0005]

The vacuum cleaner of the present invention comprises:
An electric blower provided on the vacuum cleaner body, the electric
Current detection means for detecting the current flowing through the blower, and
Current limiting flow Ru electrodeposition current values in detected by the flow detecting means and the electric blower that limits or current value during the maximum suction work rate bets feeding circuit current values of the following current value during maximum suction work rate Means.

[0006]

According to the present invention, the current value corresponding to the maximum suction power is
Even if the current value is limited, the intake air volume hardly decreases
In, it detects the current flowing in the current value detecting means to the electric blower, when the current flowing through the electric blower is detected to be the current value over time of maximum suction work rate, current limiting means maximum current value suction since it is below the current value during the work rate, while maintaining the maximum suction work rate, energy saving.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, 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. A suction port body 5 is attached to a tip of the hand operation unit 3 via a telescopic extension tube 4. Further, the electric blower 7 shown in FIG.

As shown in FIG. 1, the electric vacuum cleaner has a power switch SW, a
Current limiting circuit 8 as current limiting means for limiting the current flowing through the blower to a current value at or below the maximum suction power, and detecting the current flowing through the electric blower 7 to determine the current flowing through the electric blower 7 as the maximum suction power. A current value detecting circuit 9 is connected in series as a current value detecting means for making the current value equal to or less than the current value at the time of the maximum suction power by the control signal to the current limiting circuit 8 when the current value is equal to or more than the current value at the time of the above.

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

First, when the power switch SW is closed, the electric blower 7 is driven to rotate. When a current flows through the electric blower 7, the current flowing through the electric blower 7 is detected by the current value detection circuit 9.

When the operation of the current limiting circuit 8 is released, as shown in FIG. 3, when the current value A changes from a solid line to a two-dot chain line, the suction power B also changes from the solid line. It becomes a two-dot chain line curve.

When the current limiting circuit 8 is operating, and the current value detecting circuit 9 detects a current equal to or greater than the current value at which the suction air flow exceeds the maximum suction power, as shown by the solid line in FIG. The current value is limited by the current limiting circuit 8 to a current value corresponding to the maximum suction power, and the current value is not increased beyond a predetermined value. Thus, even if the current value is limited, the suction power B with respect to the suction air amount hardly decreases.

Further, since the current value can be reduced at substantially the same suction power, the power consumption is reduced and unnecessary heat generation is reduced, so that parts having low heat resistance can be used and the cost can be reduced.

[0015]

According to the vacuum cleaner of the present invention, the current value can be detected.
The output means detects the current flowing through the electric blower, and the value of the current flowing through the electric blower is equal to or greater than the current value at the maximum suction power.
When it is detected that that the current limiting means so to a current value below the current value at the time of maximum suction work rate, while maintaining the maximum suction work rate, it is possible to save energy.

[Brief description of the drawings]

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

FIG. 2 is a perspective view showing an external appearance of the electric vacuum cleaner.

FIG. 3 is a graph showing a relationship between a suction power and a current, and a suction air volume according to the first embodiment;

FIG. 4 is a graph showing a relationship between a suction power and a current and a suction air volume in a conventional example.

[Explanation of symbols]

 7 Electric blower 8 Current limiting circuit as current limiting means 9 Current value detecting circuit as current value detecting means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A47L 9/28 H02M 3/28 G05F 1/10

Claims (1)

(57) [Claims] 1. An electric blower provided in a main body of a vacuum cleaner, and current detecting means for detecting a current flowing through the electric blower.
When, that limits a current value below the current value at the time of maximum suction work rate when the current detecting means flows Ru electrodeposition current values to the electric blower is detected equal to or greater than the current value when the maximum suction work rate current An electric vacuum cleaner comprising: a restriction unit.