JPH03103218A - Vacuum cleaner - Google Patents

Abstract

PURPOSE:To automatically detect a malfunction even if the malfunction occurs due to external noise and to stop the operation of the cleaner by providing a control means for stopping automatically the operation when there is no load fluctuation for a prescribed time. CONSTITUTION:A power control circuit 9 of a controller 4 is brought to ON/ OFF and power control by a control circuit 10, and a current detecting sensor 11 is placed. In the case of a power source plug 12 is inserted into a power source and a handy switch 7 is in an OFF state, even if the cleaner starts an erroneous operation due to strong external noise, in the case of a cleaning operation is not executed actually, no negative pressure air quantity in a cleaner body 1, nor load current of a motor-driven air blower 3 is varied, therefore, a detection value detected by the sensor 11 is not varied either, and accordingly, when this state is monitored by the control circuit 10 for a prescribed time and there is no variation, it is decided that the cleaner is in a non-operation state, and by setting the power control circuit 9 to an OFF state in accordance with a result of this decision, such a failure as the vacuum cleaner is brought to erroneous operation for many hours due to external noise can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vacuum cleaner, and more particularly to a vacuum cleaner that prevents malfunctions due to external noise, such as unnecessary width noise when the machine is stopped. [Prior art] Conventional vacuum cleaners include, for example, Japanese Patent Application Laid-Open No. 54-1315.
As described in Publication No. 7, there are many types of electric blowers that control the operation of electric blowers using a combination of an electronic circuit and a power control element, and have various operating characteristics.

[ILM to be Solved by the Invention] However, in the past, no consideration was given to preventing malfunctions caused by external noise such as unnecessary radiated noise when the operation is stopped. Particularly in recent years, integrated devices such as microcomputers have come into widespread use, and the chances of them malfunctioning due to pulsed noise are increasing. On the other hand, in terms of circuits, countermeasures have been taken to remove noise by providing filter circuits, etc., but they are not perfect against abnormally strong noise and have their limits.

An object of the present invention is to provide an improved electric vacuum cleaner that is safe and economical and that automatically detects and stops the malfunction even if it malfunctions due to external noise such as unnecessary radiation noise when the operation is stopped. The aim is to provide the opportunity.

[Means to solve the problem]

The above object is achieved by providing a vacuum cleaner equipped with a control device that controls ON and OFF of an electric blower, including a control means that automatically stops operation if there is no load change for a certain period of time.

[Effect]

In other words. The present invention focuses on the fact that even if a vacuum cleaner malfunctions due to external noise such as unnecessary radiated noise when the operation is stopped, load fluctuation will not occur as long as there is no actual cleaning operation. The status can be detected by sensors that detect the load current and rotation speed of the electric blower, or the negative pressure and air volume inside the vacuum cleaner body, and if there is no fluctuation for a certain period of time, the power control circuit will be turned OFF. , it is possible to prevent the vacuum cleaner from malfunctioning for a long time due to the external noise. [Examples] The present invention will be explained below based on illustrated examples.
FIG. 1 is an explanatory view of the internal structure of an embodiment of the vacuum cleaner of the present invention, where L is the vacuum cleaner body, 2 is a filter device, 3 is an electric blower, and 4 is a control device. ON/OFF control is performed by a hand switch 7 provided on the handle 6 of the 5. 8 indicates a mouthpiece.

FIG. 2 is a block diagram showing the structure of the control device 4, in which numeral 9 indicates a power control circuit, and the power control circuit 9 is turned ON/OFF and its power is controlled by a control circuit 1o. 11 indicates a sensor. In this embodiment, a current detection sensor is shown.

In the above configuration, suppose that the vacuum cleaner starts malfunctioning due to strong external noise when the power plug 12 is currently plugged into the power source and the hand switch 7 is OFF. However, if the cleaning operation is not actually performed, that is, if the suction port 8 is not operated, no load fluctuation occurs, so the negative pressure air volume within the vacuum cleaner body 1 does not change, and the load current of the electric blower 3 does not change either. Therefore, the detection value detected by the sensor 11 does not change, and therefore, if this state is monitored by the control circuit 10 for a certain period of time and there is no change, it can be determined that the vacuum cleaner is in an unoperated state. By turning off the power control circuit 9 in accordance with the determination result, it is possible to eliminate the problem of the vacuum cleaner malfunctioning for a long time due to the external noise.

FIG. 3 shows a microcomputer L3 as the control circuit 10.
The same reference numerals as in Fig. 2 indicate the same parts, 1
4 is a human output circuit.

FIG. 4 is a flowchart showing the control processing procedure of the vacuum cleaner of the present invention.

As shown in Figure 4, the ON signal will turn ON if the conditions are met, whether it is a normal signal from the hand switch 7 or a signal caused by external noise. Check whether there is any load fluctuation at each time, and if there is no fluctuation, enter the operation stop processing procedure,
By maintaining the standby state until reset processing is carried out from the outside (for example, by a signal from the hand switch 7), it is possible to prevent unoperated operation for a certain period of time or more, which would interfere with normal operation by the hand switch 7. Moreover, during normal operation when the hand switch 7 is normally turned on, it is possible to prevent an abnormally long period of non-operation operation, and wasteful use of power consumption can be eliminated.

In addition. As a side effect of the present invention, even during operation of the vacuum cleaner, even in abnormal situations where the suction port 8 is blocked or clogged due to suction or adsorption of foreign matter and load fluctuations no longer occur, the vacuum cleaner The operation of the vehicle can be stopped dynamically.

In addition, in the embodiment shown in FIG. 3, the microcomputer 13 is used for the control circuit 'LO, but instead of this, the control circuit 10 may be constructed of an electronic circuit such as a combination of logic circuits. You may also do so.

Furthermore, in order to ensure that the vacuum cleaner stops,
As shown in FIG. 5, a mechanical switch 15, such as a relay, is connected to the power supply line and is controlled by a control circuit 10.
may be provided to prevent the vacuum cleaner from malfunctioning again after the vacuum cleaner is stopped.

〔Effect of the invention〕

The present invention is as described above, and as is clear from the explanation of the illustrated embodiments, according to the present invention, even if a malfunction occurs due to external noise such as unnecessary radiation noise when the operation is stopped, the malfunction can be prevented. automatically detect and stop the
It is possible to provide an improved vacuum cleaner that is safe and economical.

[Brief explanation of drawings]

Fig. ↓ is an explanatory diagram of the internal structure of an embodiment of the vacuum cleaner according to the present invention, and Figs. FIG. 4 is a block circuit diagram showing an example, and is a flowchart showing a control processing procedure of the vacuum cleaner of the present invention. 3...Electric blower, 4...Control device, 11...Sensor, 11...Relay, 13...Microcomputer (other engineering names) Fig. 3 Fig. 4

Claims (1)

[Claims] 1. A vacuum cleaner equipped with a control device for controlling ON/OFF of an electric blower, characterized in that the vacuum cleaner is equipped with a control means for automatically stopping movement if there is no load change for a certain period of time. A vacuum cleaner. 2. The vacuum cleaner according to claim 1, wherein the means for automatically stopping the operation when there is no load change for a certain period of time is a control circuit having a microcomputer. 3. In the invention as claimed in claim 2, if there is no load change for a certain period of time, the O is always turned on until a mechanical return signal is input.
A vacuum cleaner that has a control means that becomes an FF. 4. The vacuum cleaner according to claim 1, wherein the means for automatically stopping operation when there is no load change for a certain period of time is a mechanical switch.