JPS58146333A - Electric cleaner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved configuration of a vacuum cleaner that controls the rotational speed of an electric blower by sensing a decrease in pressure inside the vacuum cleaner using a pressure sensor Vζ.

In this type of vacuum cleaner, when the pressure sensor is installed in the dust collection case, the pressure sensor may become misaligned due to the shock of disposing of the dust, or the detection performance may be degraded due to air leakage. In addition, there was a drawback that the performance was affected by moisture and the like.

The present invention solves the above-mentioned drawbacks of the prior art by making the pressure sensor communicate with the front part of the filter device housed in the curved part of the blower case.

Hereinafter, the present invention will be explained with reference to an actual example shown in the drawings.

+1+ is a blower case with a pair of rear wheels +21 +21 on both sides of the lower part and a handle (3) on the upper part, and inside the case there is a rubber etc. An electric blower (7) is disposed via an elastic shock absorber +151161.

(8) has a freely adjustable front wheel M++91 on the bottom, has a large suction port (10) and a handle (11) on the nt1 part and the top, and has a sole packing (12) attached to the peripheral edge of the rearward opening. A dust collecting case containing a filter device (13) is removably connected to the front concave portion of the blower case t1+ by means of an F section joining portion (14) and an upper clamping means (16).

The filter device 03) includes a −order filter (18, 1
and a secondary filter 07), and the suction port (10)
Of the dust that has flowed in, coarse dust is accumulated in the dust collection chamber between the dust collection case (8) and the secondary filter, and fine dust is accumulated in the space between the primary filter (I6) and the secondary filter (Iη). part 09).

120) is a semiconductor pressure sensor housed in the space body l) of the front upper blade of the blower goose tl) 111, and the low pressure side of the sensor is connected to the secondary filter (17) and the bore 1 of the blower case tl). Electric blower (7) formed between the surface part
), and the high-pressure side is connected to the primary filter ( via an elastic trumpet-shaped connection *@a) housed in the blower case H and an L-shaped connecting pipe housed in the dust collection case 181. It communicates with the Moeto dust collection chamber 16+.A net member is provided at the open end of the connecting pipe 41 in the dust collection case (8).

The pressure sensor 0) has four resistors (R1) (R2
) (R3) (R4) Bridge circuit formed by
The output is input to a control circuit 9) via an amplifier circuit 8) to control the rotational speed of the electric blower (7).

(30) is a display line.

J: If you have the configuration described in 2 and the primary filter (remains and secondary filter device) is in poor condition, the pressure difference between the front and rear of the filter device chamber △P = P1 - P2
) becomes O, and the pressure sensor (2)) becomes Pl and P2 from V
The rotation speed of the electric Ig machine (30) is increased via the θt single amplifier circuit (c) and the control circuit (9) to prevent the suction force from decreasing. - Also, when the reading state of the filter device (I) is restored by dust removal, the pressure difference after 07f of the filter device (13) becomes small and the rotational speed of the retractable air blower (71) returns to the constant current state.

As described above, the present invention includes a pressure sensor for detecting the pressure difference before and after the filter device and controlling the number of revolutions of the four-stroke blower. Since the pressure side of the pressure sensor is connected to the air intake of the electric blower and the high pressure side is connected to the filter device, the pressure sensor is not likely to receive a shock when disposing of dust. Also, the word "guchi" means "washing the dust with water". There is no need for a connector on the right side of the dust collection booth, and the construction is simple, with just a trumpet-shaped connecting pipe.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view of essential parts of a vacuum cleaner according to the present invention, FIG. 2 is an explanatory diagram of a pressure sensor, and FIG. 6 is a block diagram of an electric circuit. +11...Blower case, (7)...Electric blower, (8)...Dust collection case, 03)...Filter device, 0)...Pressure Sentsu -1 So...Intake part space. Applicant Sanyo Electric Co., Ltd. Agent Masukon Shizuka Sano Figure 1-

Claims (1)

[Claims] 1) In a case configured by removably connecting a blower case with a built-in electric blower and a dust collection case housing a filter device in the front curved part of the case, the pressure difference between the front and rear of the filter device is eliminated. A pressure sensor for controlling the rotation speed of the electric blower is arranged and housed in a space above the curved part of the blower case, and the low pressure side of the pressure sensor is connected to the intake part of the electric ATB blower, and the high pressure side is connected to the bend of the filter device. A vacuum cleaner characterized in that the parts communicate with each other.