JPH0523273A - Vacuum cleaner - Google Patents

Abstract

PURPOSE:To provide a vacuum cleaner in which energy saving is achieved without lowering its suction power. CONSTITUTION:When a power switch SW is closed an electric blower 7 is driven and rotated. When a current is made to flow through the electric blower 7 a current value detection circuit 9 detects the current flowing through the electric blower 7. When the current value detection circuit 9 detects current above a value at which the amount of inlet air exceeds that which can be reached at maximum suction power, a current limiting circuit 8 limits the current value to that corresponding to the maximum suction power. Thereby energy saving is achieved while the maximum suction power is maintained.

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 the value of current flowing through an electric blower.

[0002]

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

[0003]

However, as shown in FIG. 4, when the intake air amount increases and the current value A exceeds a predetermined value, the suction power B does not improve even if the current value A is increased. On the contrary, it has a problem that it decreases and energy is lost.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide an electric vacuum cleaner that saves energy without lowering the suction work rate.

[0005]

The electric vacuum cleaner of the present invention comprises:
An electric blower provided in the main body of the electric vacuum cleaner, a current limiting means for limiting a current flowing through the electric blower to a current value at the time of maximum suction power, and the electric blower detecting a current flowing through the electric blower. When the value of the current flowing in the current is greater than or equal to the current value at the time of maximum suction power, the current limiting means is provided with current value detection means for making the current value equal to or less than the current value at the time of maximum suction power.

[0006]

The present invention detects the electric current flowing through the electric blower,
When the current value flowing in the electric blower is equal to or higher than the current value at the maximum suction work rate, the current value detecting means causes the current limiting means to make the current value less than or equal to the current value at the maximum suction work rate. Energy conservation while maintaining.

[0007]

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

In FIG. 2, reference numeral 1 denotes an electric vacuum cleaner body. A base end of a hose 2 is detachably connected to the electric vacuum cleaner main body 1, and a tip end of the hose 2 is branched rearward. A hand operation unit 3 having a shape is provided. A suction port body 5 is attached to the tip of the hand operation section 3 via an extendable extension tube 4. Further, the electric blower main body 1 has a built-in electric blower 7 shown in FIG.

As shown in FIG. 1, the electric vacuum cleaner includes a commercial AC power source E, a power switch SW, and an electric blower 7
Current limiting circuit 8 as a current limiting means for limiting the current flowing in the fan to a value equal to or less than the current value at the time of the maximum suction power, and the current flowing in the electric blower 7 by detecting the current flowing in the electric blower 7. A current value detection circuit 9 is connected in series to the current limiting circuit 8 as a current value detection means for making the current value less than or equal to the current value at the time of the maximum suction work rate by the control signal when the current value is equal to or more than the current value at the time.

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

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

When the current limiting circuit 8 is deactivated, 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 curve.

When the current limiting circuit 8 is operating and the current value detecting circuit 9 detects a current value equal to or higher than the current value at which the suction air volume exceeds the maximum suction work rate, as shown by the solid line in FIG. The current limiting circuit 8 limits the current value to a current value corresponding to the maximum suction work rate, and does not increase the current value beyond a predetermined value. In this way, even if the current value is limited, the suction power B with respect to the amount of suction air hardly decreases.

Further, since the current value can be reduced with substantially the same suction work rate, the power consumption is reduced and unnecessary heat generation is reduced. Therefore, it is possible to use parts having low heat resistance and to reduce the cost.

[0015]

According to the electric vacuum cleaner of the present invention, the electric current flowing through the electric blower is detected, and when the electric current flowing through the electric blower is equal to or more than the electric current at the maximum suction power, the electric current detecting means detects the electric current. Since the current limiter causes the current value to be equal to or less than the current value at the time of maximum suction work rate, it is possible to save energy while maintaining the maximum suction rate.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an electric vacuum cleaner of the present invention.

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

FIG. 3 is a graph showing the relationship between suction power and current and suction air volume.

FIG. 4 is a graph showing a relationship between a suction work rate 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

Claims (1)

Claim: What is claimed is: 1. An electric blower provided in an electric vacuum cleaner body, and a current limiting means for limiting a current flowing through the electric blower to a current value at a maximum suction power or less, A current value that detects the current flowing through the electric blower and causes the current limiting means to make the current value less than or equal to the current value at the time of maximum suction power when the value of the current flowing through the electric blower is greater than or equal to the current value at the time of maximum suction power. An electric vacuum cleaner comprising: a detection unit.