JPH03178625A - Vacuum cleaner - Google Patents

Abstract

PURPOSE:To save useless energy and to decrease noise by providing a means for detecting static pressure and a load current in an operating state, and deciding that cleaning is not executed or a suction port is sucked to the surface to be cleaned unless the detection quantity is fluctuated for a prescribed time, and lowering the suction force. CONSTITUTION:A detection value H detected from a pressure sensor 10 having a detecting part in a body passage is transmitted as a signal to a control circuit 9, and the control circuit 9 decides that cleaning is not executed at pressure or a suction port is sucked to the surface to be cleaned unless its detection value H is fluctuated in a prescribed period, and lowers the speed of revolution of a motor-driven air blower 2. In this case, simultaneously, the control circuit 9 decides that the suction port 8 is in a sucked state and a non-cleaning state, when the detection value H from the pressure sensor 10 is larger than or almost the same as an average value H0 of the detection value at the time of cleaning executed immediately before, and reduces the suction force by lowering remarkably the speed of revolution. When H>=0 or an absolute value ¦ H¦ of H is smaller than a prescribed value (a), power is lowered remarkably, comparing with the time of a state of A, and in addition to an effect of energy saving and a noise reduction, overheating of the motor-driven air blower 2 caused by suction of the suction port is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention includes a detection means for detecting a change in the operating state of a vacuum cleaner having an electric blower, and a detection means for detecting a change in the operating state of a vacuum cleaner having an electric blower, and a detection means for detecting a change in the operating state of a vacuum cleaner having an electric blower; The present invention relates to a method of operating a vacuum cleaner having a control unit for controlling the vacuum cleaner.

[Conventional technology]

It is known that a conventional vacuum cleaner controls the output of an electric blower according to a value detected by a sensor such as a pressure sensor, as described in Japanese Patent Application Laid-Open No. 61-280831.

[Problem to be solved by the invention]

The above-mentioned conventional technology does not consider a control method when the surface to be cleaned is not being cleaned or when the suction port and the surface to be cleaned are attracted to each other. That is, an object of the present invention is to reduce the suction force depending on the state in which the uncleaned suction port is floating or when the suction port and the surface to be cleaned are attracted to each other, thereby saving wasted energy. To provide a vacuum cleaner capable of reducing noise when not cleaning by dropping the cleaner.

[Means to solve the problem]

In order to achieve the above object, the present invention provides means for detecting static pressure and load current in the operating state of a vacuum cleaner,
If the detected amount does not fluctuate for a predetermined period of time, it is determined that cleaning is not being performed or the suction port is adsorbed to the surface to be cleaned, and control is applied to reduce the suction force.

In addition, in order to determine whether cleaning has not been performed or whether the suction port is adsorbed to the surface to be cleaned, the absolute value of the static pressure is calculated and compared.

[Effect]

When the surface to be cleaned is not being cleaned or when the suction port is attracted to the surface to be cleaned, the detected value of the static pressure or the load current of the electric blower does not change over time.

If there is no fluctuation, the control means applies control to lower the suction force.

In addition, static pressure can be used to distinguish between when the suction mouth is floating in the air and the surface to be cleaned is not being cleaned, and when the suction mouth is adsorbed to the surface to be cleaned.
This can be determined by comparing the absolute value of the current etc. with the average value of the detected values during the previous cleaning.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4.

FIG. 1 shows the overall configuration of the present invention.

In the figure, reference numeral 1 indicates a vacuum cleaner, which consists of a main body case 3 containing an electric blower 2 and a dust case 5 containing a filter 4, to which a hose 6, an extension pipe 7 and a suction port 8 are connected. Reference numeral 9 denotes a control circuit, which is composed of an electric circuit and an electronic circuit including a central processing unit, and includes a pressure sensor (detection device I).
) The electric blower 2 is controlled according to the detected value of 10. Third
The figure is a block diagram showing the configuration of the embodiment. FIG. 2 shows the basic operational relationship in the above configuration. The horizontal axis shows the time axis (1), and the vertical axis shows the pressure detection value H by the pressure sensor 10 having a detection part in the main body flow path during cleaning. Here, the suction port 8 is floating away from the floor surface. In other words, when cleaning is not being performed, as shown by A in FIG. 2, the detected static pressure value H1 does not vary over time during that period. Cleaning state (state B in Figure 2)
When the flow path is blocked by the floor surface, the detected static pressure value H becomes larger than when the suction port is lifted and floating, and the pressure fluctuates over time due to the unevenness of the floor surface. The average value at this time is defined as Ha. In addition, when the suction port is completely attracted to the surface to be cleaned without operating the suction port (state C in Figure 2), the detected static pressure value H does not change over time, and the value H2 Bigger than when floating, when cleaning (state B in Figure 2)
is larger than or almost equal to the average value Ho. An embodiment of the present invention will be described based on the above operational relationship. The detection value H detected from the pressure sensor IO having a detection part in the main body flow path is transmitted to the control circuit 9 as a signal,
If the detected value H does not fluctuate within a predetermined period, the control circuit 9 determines that the current cleaning is not being performed or that the surface to be cleaned is adsorbed, and lowers the rotation speed of the electric blower 2. control. At this time, the control circuit 9
is the detected value H from the pressure sensor 10 during the previous cleaning operation (
If the detected values are thicker or more or less the same as the average value HO in the state of section B in FIG. Then, control is applied to significantly lower the rotation speed and reduce the suction force. That is, Δ
If H=H2-Ho, then ΔH≧O or the absolute value 1ΔH1 of ΔH is smaller than the predetermined value a, and 1ΔHl < a
When the relationship holds true, by significantly lowering the power than in the state of A in Fig. 2, in addition to saving energy and reducing noise, it is possible to prevent the electric blower 2 from overheating due to a decrease in air volume due to suction suction. It becomes possible.

As another example, an example is shown in which the load current of the electric blower 2 is detected. As shown in FIG. When cleaning starts, the airflow is blocked by the suction port 8 and the air volume decreases, and the load current fluctuates at a reduced level.

Further, when the suction state is reached, the load current of the electric blower does not change, but its value becomes significantly smaller than when the suction port 8 is away from the floor surface. Pressure sensor 10 of the first embodiment
If the load current of the electric blower 2 is used instead of the detected value, the change tendency of the absolute value will be reversed, but it can be determined and controlled in the same manner as in the first embodiment.

Furthermore, similar effects can be obtained by detecting and controlling other variables such as the rotational speed of the electric blower 2.

〔Effect of the invention〕

According to the present invention, it is possible to distinguish between a state in which no cleaning is being performed and a state in which the suction port is adsorbed to the surface to be cleaned, and there is an effect that control corresponding to each state can be applied to save wasted energy. In addition, since the suction force is reduced, noise can also be reduced. Furthermore, since the amount of reduction in suction force can be changed between the state where no cleaning is being performed and the state where the suction port is adsorbed to the surface to be cleaned, the above-mentioned effects can be further enhanced.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of the present invention, and FIGS. 2 and 4 are characteristic diagrams showing the basic operational relationships of the present invention. FIG. 3 shows a simplified block diagram of the invention. DESCRIPTION OF SYMBOLS 1... Vacuum cleaner, 2... Electric blower, 8... Suction port, 9... Control circuit, 10... Pressure sensor (detection device)
.

Claims (1)

[Claims] 1. A detection device that has an electric blower and is capable of directly or indirectly detecting one or more of changing factors such as static pressure that varies depending on the operating state, load current of the electric blower, etc.; A vacuum cleaner having a control device capable of controlling the suction performance of an electric blower according to the amount, and lowering the suction force if the detected amount does not fluctuate for a predetermined time,
A vacuum cleaner characterized in that the amount of reduction in suction force is controlled in accordance with the absolute value of the detected amount when there is no change.