JPS6363220B2 - - Google Patents

Description

[Detailed description of the invention] Industrial applications The present invention relates to a vacuum cleaner.

Conventional configuration and its problems In conventional vacuum cleaners, when the filter is clogged or the dust collection chamber is full of dust, an alarm is activated by a spring or the like due to the increase in the degree of vacuum between the filter and the blower. I was using the pointer to move.

This will be explained based on the drawings. In FIG. 1, 1 is an electric blower, 2a and 2b are filters for fine dust and coarse dust, respectively, and 3 is the filter 2a,
The dust box 44 equipped with the dust box 2b detachably connects the dust box 3 to the electric blower 1.
and a body with a built-in cord reel 5; 7 is a dust indicator whose one end is connected between the filters 2a, 2b and the electric blower 1, and the other end is connected to the outside air; 8 is a pointer 9 in the dust indicator 7; It is a transparent indicator window that allows you to see the movement. 10 is a spring that biases the pointer 9.
In such a configuration, when the degree of vacuum between the filter and the electric blower increases due to the filter becoming clogged or the dust box becoming full of dust, the pointer 9 moves to indicate this to the user.

However, this method is difficult to understand,
In addition, it was not possible to control the electric blower by stopping it or sounding the buzzer when the garbage was full.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned problems and provides an inexpensive and reliable method for detecting dirt clogging.

Structure of the Invention The vacuum cleaner of the present invention includes a ventilation hole provided on a printed circuit board that is provided between a filter and an electric blower and communicated with the atmosphere, a conductive valve that closes this ventilation hole, and a conductive valve that is connected to the printed circuit board. The dust clogging detection device is made up of printed electrodes and a spring that biases the valve. When the degree of vacuum increases, the valve opens, allowing outside air to flow in to prevent the electric blower from burning out. A conductive valve separates from an electrode on a printed circuit board to detect clogging.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below based on the accompanying drawings.

In Fig. 2, 21 is a vacuum cleaner casing, inside which is an electric blower 22, and in front of which is a filter 2.
There are 3. 24 is a dust collection chamber, and a connection port 25 through which dust enters from the outside is open. 26 is an exhaust port, and 27 is a dust clogging detection section. FIG. 3 is an enlarged view of the dust clogging detection section 27, and 30 is a support plate made of a printed circuit board having an air inflow hole 31. The air inflow hole 31 is normally closed with a conductive valve 32. ing. 33 is a spring that biases the valve 32, and 34 is a support for the spring 33. 35a and 35b are electrodes provided on the support plate 30 and made by printing.

The operation of the above configuration will be explained. When the valve 32 is not clogged with dirt, the valve 32 is biased by the spring 33 to block the air inlet 31 and short-circuit the electrodes 35a and 35b. Next, when the vacuum level increases due to dirt clogging, the valve 32 is moved by a force stronger than the bias of the spring 33. Therefore, the air inflow hole 31 is opened and outside air is introduced. Therefore, the electric blower 22 is cooled and burnout is prevented. At the same time, electrodes 35a and 35b are opened. FIG. 4 shows an example of a display circuit, in which the electrodes 35a, 35 are connected in parallel to a neon lamp 42 connected in series with a resistor 41.
Normally, the valve 32 connects the electrodes 35a and 35b, so the neon lamp 42 does not light up. However, if the vacuum level increases due to clogging with dust, the valve 32 closes the electrodes 35a and 35b. The circuit moves away from the circuit and becomes open, and the neon lamp 42 lights up.
Displays garbage clogging to the user. It goes without saying that instead of the neon lamp, an LED lamp or a buzzer may be used.

FIG. 5 shows a configuration for stopping the electric blower 22 when the electric blower 22 is clogged with dust, and the electrodes 35a and 35b are connected to a power control circuit 50 connected in series with the electric blower 22.

Effects of the Invention As described above, according to the present invention, a conductive valve that closes a ventilation hole provided on a printed circuit board communicating with the atmosphere;
It consists of electrodes made by printing on this printed circuit board and a spring that biases the valve, and when the degree of vacuum increases due to clogging with dirt, the valve opens and outside air is introduced, preventing the electric blower from burning out. When the conductive valve separates from the electrode on the printed circuit board, an electrical signal indicating dirt clogging can be generated, and it is inexpensive and has a simple structure.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a conventional example, Fig. 2 is a sectional view of a vacuum cleaner showing an embodiment of the present invention, Fig. 3 is a sectional view showing a dust clogging detection section, and Fig. 4 is a sectional view for display purposes. Circuit diagram FIG. 5 is a circuit diagram of another example. 22...Electric blower, 23...Filter, 27
...Dust clogging detection unit, 30...Printed circuit board, 3
1...Vent hole (air inflow hole), 32...Valve, 33
...Spring, 35a, 35b...Electrode.

Claims (1)

[Claims] 1. A dust clogging detection section consisting of a ventilation hole provided on a printed circuit board that communicates with the atmosphere, a conductive valve biased by a spring to close this ventilation hole, and an electrode provided on the printed circuit board is connected to a filter. A vacuum cleaner installed between the electric blower and the electric blower.