JPS6041894Y2 - vacuum cleaner - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a vacuum cleaner using a disposable bag filter, and is particularly intended to improve its dust collection efficiency.

In conventional vacuum cleaners using disposable bag filters, as shown in FIG. 3, a back filter is provided behind the disposable bag filter 13 to collect fine dust that has passed through the disposable bag filter. However, since the filter member 20 of this back filter is made of urethane foam or the like, when a large amount of dust is collected in the disposable bag filter 13, this disposable bag filter is gradually expanded, causing the back filter to open. This has the disadvantage that it blocks the air intake surface, reducing the dust collection effect.

This invention is intended to eliminate the above-mentioned drawbacks of the conventional art, and an embodiment of this invention shown in FIGS. 1 and 2 will be described below.

In the figure, 1 is a main body case that houses an electric blower 2 and a cord reel (not shown), and 3 is a dust collection case that is detachably connected to this main case. It has a filter attachment port 5, an opening 6 on the bottom,
A back filter is detachably attached to the filter attachment opening 5, and the opening 6 is covered by a cover 8 so as to be openable and closable.

The back filter consists of a filter member 9 formed in a wave-shaped cross section and a synthetic resin frame 10 integrally formed around the periphery of the filter member. A reinforcing member 11 is formed integrally with the frame 10.

Reference numeral 13 denotes a disposable bag filter composed of a mounting frame 15 having a suction port 14 and a bag-shaped paper filter 16 whose mouth edge is glued to the mounting frame, and a rail formed on the inner wall surface of the dust collection case 3. The mounting frame 15 is inserted and held between the caps 17 and 17, and is supported from below by a support piece 18 formed on the lid 8 so that the suction port 4 and the suction port 14 match.

A sealing gasket 19 is installed between the suction port 4 and the suction port 14.

Note that reference numerals 12 and 12' denote a large number of ribs formed on the inner wall surfaces of the dust collecting case 3 and the lid body 8 to prevent the disposable bag filter 13 from coming into close contact with the dust collecting case 3 and the lid body 8.

In the above configuration, when the electric blower 2 is operated, outside air containing dust enters the dust collection case 3 through the suction port 4, where most of the dust is collected by the disposable bag filter 13. The fine dust that has passed through is collected by a back filter provided behind the main body case 1, and only clean air is exhausted to the outside from an exhaust port (not shown) of the main body case 1.

However, when the outside air enters the disposable bag filter 13, its inertia first forces the side facing the suction port 4 backward, presses the back filter installed behind it, and further spreads the entire disposable bag filter 13. It works like this.

This spreading force increases as the amount of dust collected increases.

If the disposable bag filter 13 is stretched out and blocks the intake surface of the back filter as in the conventional case, the dust collection efficiency will be significantly reduced, but in this embodiment, the filter member 9 of the back filter is The back filter can sufficiently withstand the pressing force of the disposable bag filter 13 because it has a corrugated cross-sectional shape and also has a reinforcing member 11 made of synthetic resin on at least the top of the wave on the intake side of this filter member. In addition to being strong, the bag filter 13 does not come into close contact with the intake surface of the bag filter, so the dust collection efficiency is not reduced.

As described above, according to this invention, the back filter provided at the rear of the disposable bag filter is formed into a wave-shaped cross section, and a reinforcing member made of synthetic resin is provided at least at the top of the wave on the intake side. This has the practical effect of not blocking the intake surface of the back filter even if the filter is pushed backward by the intake of outside air, and improving the dust collection efficiency of not only the disposable bag filter but also the back filter.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a vacuum cleaner showing an embodiment of this invention, FIG. 2 is a cross-sectional view taken along the line ■--■ in FIG. 1, and FIG. 3 is an open cross-sectional view showing a conventional example. 1 is the main body case, 2 is the electric blower, 3 is the dust collection case, 7
1 is a back filter, 11 is a reinforcing member, and 13 is a disposable bag filter.

Claims (1)

[Scope of Claim for Utility Model Registration] l A main body case housing an electric blower, a disposable bag filter detachably connected to the main body case, a disposable bag filter installed on the intake side, and a back filter installed on the exhaust side behind the disposable bag filter. What is claimed is: 1. A vacuum cleaner comprising: a dust collecting case, the back filter having a wave-shaped cross section, and a reinforcing member provided at least at the top of the wave on the intake side that contacts the bag filter. 2. The vacuum cleaner according to claim 1 of the utility model registration, characterized in that the reinforcing member is made of synthetic resin.