HK1039552B - A suction cleaning device for domestic vacuum cleaners - Google Patents

Description

Suction cleaning device for domestic vacuum cleaner

Technical Field

The invention relates to a suction cleaning device for a domestic vacuum cleaner, comprising:

a suction head having a suction opening, the suction opening edge of which abuts the floor,

a turbine in the suction head turbine chamber, said turbine being driven by the suction air flow,

a roller provided with a spiral arrangement of bristles, said roller being arranged in a roller chamber of the suction head and being driven by a turbine,

a passage connecting the roller chamber and the turbine chamber, and

an output duct tiltably connected to the turbine chamber and having a suction pipe connection,

wherein the turbine is configured as a pelton turbine and the suction air flow flows substantially tangentially of the turbine when leaving the suction duct.

Background

A suction cleaning device with the above-mentioned construction is known from EP-B0338780, in which the roller is provided with a plurality of flexible wiper blades. It is thought that it is preferable to have bristles on the roller because better cleaning results are obtained.

DE-a 4000374 discloses a suction cleaning device with a Pelton wheel (Pelton wheel) driven by a suction air flow and a roller which is suitable for being driven by the Pelton wheel and is provided with bristles. The bristles of the roller protrude through a suction opening provided at the bottom side of the roller chamber.

In the above embodiment, the turbine is configured as a pelton turbine. Other constructions in known devices of this type, such as that disclosed in DE-C4105336, have a turbine constructed as a cross-flow turbine, the blades of which are all open towards the inside. The cross-flow turbine is subjected to a substantially radial air flow. Air enters radially inside the turbine at the center of the annularly arranged blades and leaves radially inside. Cross flow turbines have good efficiency but suffer from unpleasant odours due to their construction being relatively messy. Small items such as paper slips, paper clips, wool, etc. can cause malfunction of the cross flow turbine.

Suction cleaning devices having a turbine driven by a suction air flow, which turbine is in turn used to drive a cleaning roller, have to meet a number of requirements. The turbine should operate quietly, cause only small pressure losses in the suction air flow, have good turbine efficiency and high and efficient turbine power. Bristle brush rolls must also be suitable for use in this turbine unit to effectively assist in cleaning both short pile and long pile carpets. Finally, the suction cleaning device must be able to suck small items such as paperclips, paper slips, line segments without the risk of causing malfunction. The known suction cleaning devices have not been able to meet all these requirements to the desired extent.

Disclosure of Invention

The object of the present invention is to provide a static high-power suction cleaning device which can suck small objects without difficulty.

The invention relates to a suction cleaning device of a household vacuum dust collector, which comprises: a suction head having a suction opening whose suction opening edge abuts the floor, a turbine in a turbine chamber of the suction head, said turbine being driven by a suction air flow, a roller provided with a spiral arrangement of bristles, said roller being provided in the roller chamber of the suction head and being driven by the turbine, a passage connecting the roller chamber and the turbine chamber, and an outlet duct tiltably movably connected to the turbine chamber and having a suction connection, wherein: the turbine is configured as a pelton turbine and the suction air flow from the channel flows substantially tangentially to the turbine, characterised by the following mutually coordinated arrangements: 1.1) the rollers are provided with bristles, the bristle ends being arranged in zones formed by two concentric circular enveloping curves, the smaller enveloping curve being spaced in the region of the suction opening by a distance of 1mm from the plane of the suction opening edge; the envelope curve with the larger diameter intersects the plane of the suction opening edge in the area of the suction opening and protrudes at the bottom by 2mm from said plane; 1.2) the distance between the partition wall of the roller chamber containing the passage to the turbine chamber and the bristles of the rotating roller is at least 8mm at the narrowest point; 1.3) the ratio between the volume of the turbine chamber and the volume occupied by the turbine device is between 5: 1 and 13: 1, the diameter of the turbine is between 45 and 60mm and the length is greater than 40 mm.

Starting from a suction cleaning device with the described configuration, the problem is solved according to the invention by the following coordination of the components:

1.1) the rollers are provided with bristles, the bristle ends being arranged in zones formed by two concentric circular enveloping curves, the smaller enveloping curve being spaced 1mm from the plane of the suction opening edge in the region of the suction opening, wherein the opening edge slides over a cloth covered for cleaning; whereas the envelope curve with the larger diameter intersects the plane of the suction opening edge in the area of the suction opening and projects 2mm from said plane at the bottom.

1.2) the distance between the partition wall of the rotating roller containing the passage to the turbine chamber and the bristles on the rotating roller is at least 8mm at the narrowest point.

1.3) the ratio between the volume of the turbine chamber and the volume occupied by the turbine device is between 5: 1 and 13: 1, the diameter of the turbine is between 45 and 60mm and the length is greater than 40 mm.

If the suction cleaning device is designed as a powerful vacuum cleaner which can generate a voluminous flow and a high vacuum in the suction opening, the bristle arrangement in the paragraph of text which is indicated in point 1.1) with the parameter ranges can effectively project slightly forward on the underside of the suction opening, the projecting bristles providing an additional function of bearing against the floor. If a low-power vacuum cleaner is connected, it is better that the bristles do not project forward on the underside of the suction opening. In order to effectively remove the contaminant particles entrained in the air stream, it is important to comply with point 1.2). If the limits according to the invention are not complied with, the removal of the dirt particles due to the vortex of air plus the flow created by the rotating bristle roller will be disturbed. Finally, it is also important to comply with point 1.3). The high ratio of the volume of the turbine chamber to the volume occupied by the turbine apparatus may promote the flow of dirt particles in the suction air stream through the turbine chamber and be expelled. On the other hand, as the volume ratio increases, the power delivered to the turbine to flow air through the turbine chamber may decrease. If the turbine chamber is made smaller than the turbine, the driving of the turbine can be facilitated, but on the other hand, the removal of the dirt is not facilitated. Preferably, the volume ratio of the volume of the turbine chamber to the volume occupied by the turbine apparatus is in the range of 6: 1 to 8.5: 1. It is also advantageous if the turbine extends substantially over the entire width in the preferably cylindrical turbine chamber.

The suction cleaning device constructed according to the teachings of the present invention is distinguished by particularly good suction performance and low noise. However, if only a single one of the above-mentioned points is modified, the result is significantly deteriorated, and thus there is a complicated correlation between the above-mentioned effects.

The suction performance can be further optimized as a result of the mutual coordination described below. For example, the passage to the turbine chamber should have an outlet of rectangular cross-section, 10 to 18mm wide and 14 to 18mm high. The distance between the roller and the axis of rotation of the turbine is preferably 70 to 90 mm. The suction performance can be further improved if the roller is provided at a position deviated from the center of the suction hole.

In operation, secondary air may enter the suction cleaning device in the gap between the bushing and the more movable part. Thus, according to the invention, the bushing and the relatively movable parts are preferably sealed in such a way that, when connected to a conventional vacuum cleaner with the suction connection closed, the vacuum cleaner will generate a pressure drop of 100mbar to atmospheric pressure. When the suction cleaning device is connected to a vacuum cleaner and the suction apertures are closed by suction, a pressure drop of at least 60mbar occurs. It was therefore found to be particularly suitable under the test conditions if the pressure drop which occurs is from 60 to 90 mbar. If the seal is too tight, the suction cleaning device risks catching on the floor of the high pile felt. To avoid this risk, compromises have to be made elsewhere. For this reason, the secondary air should be suitably coordinated with other parameters of the suction cleaning device.

The invention will be described in detail hereinafter with reference to exemplary embodiments thereof, which are illustrated in the accompanying drawings.

Drawings

Fig. 1 is a schematic plan view of a suction cleaning device according to the present invention with the top of the housing removed.

Fig. 2 is a longitudinal sectional view of fig. 1 taken along line I-I.

Fig. 3 shows a highly enlarged view of a detail from fig. 2.

Detailed Description

The basic construction of the suction cleaning device shown in the figures comprises a suction head 1 with a suction opening, the opening edge 2 being in close proximity to the ground, a turbine 3 which is driven by a suction air flow in a turbine chamber 4 of the suction head, a roller 6 provided with a spiral arrangement of bristles 5, the roller 6 being arranged in a roller chamber 7 of the suction head 1 and being driven by the turbine 3, a passage 8 connecting the roller chamber 7 to the turbine chamber 4, and an outlet duct 9 which is tiltably movably connected to the turbine chamber 4 and has a suction connection 10. The turbine 3 is configured as a pelton turbine to which the suction air flow leaving the channel 8 flows substantially tangentially.

According to the invention, the suction cleaning device has the following coordinated configuration:

the bristles 5 provided on the roller 6 are located in a zone formed by two concentric circular enveloping curves a, b, the smaller of which is at a distance of 1mm from the plane C of the suction-opening edge 2 in the region of the suction opening, which edge slides on a cloth to be covered for cleaning, while the larger diameter enveloping curve b intersects the plane of the suction-opening edge 2 in the region of the suction opening and protrudes 2mm from said plane at the bottom (fig. 3).

The distance between the partition containing the passage to the turbine chamber 4 and the bristles 5 on the rotating roller 6 is at least 8mm at the narrowest point (fig. 2).

The ratio of the volume of the cylindrical turbine chamber 4 to the volume occupied by the turbine device 3 is in the range of 5: 1 to 13: 1, preferably 6: 1 to 8.5: 1. The turbine 3 has a diameter of 45 to 60mm and a length of more than 40mm and extends substantially the entire width of the turbine chamber 4.

The channel 8 leading to the turbine chamber 4 has an outlet of rectangular cross-section, 10 to 18mm wide and 14 to 18mm high (figures 1 and 2).

The distance L of the valve between the roller and the axis of rotation of the turbine is 70 to 90mm (fig. 2).

The bushing and the relatively movable parts of the suction cleaning device shown in the figures are advantageously sealed in such a way that a pressure drop of 65 to 80mbar occurs during the tests customary in the industry to be described below. During the test, a conventional vacuum cleaner, which was connected to the suction cleaning device, was operated such that it produced a pressure drop of 100mbar to atmospheric pressure when the suction connection was closed. The vacuum cleaner thus set was then connected to a suction cleaning device for testing, the suction hole of which was sealed by attaching a foil thereto. The pressure occurring on the suction side of the vacuum cleaner is measured and the suction cleaning device is in accordance with the provisions according to the invention if a pressure drop of at least 60mbar, preferably 60 to 90mbar, is formed to atmospheric pressure.

The parameter-matched suction cleaning device according to the invention is distinguished by an extremely good suction performance and low noise.

Claims (6)

1. A suction cleaning device of a home vacuum cleaner, comprising:

a suction head (1) having a suction opening, the suction opening edge (2) of which adjoins the floor,

a turbine (3) in a turbine chamber (4) of the suction head (1), said turbine (3) being driven by a flow of suction air,

a roller (6) provided with a spiral arrangement of bristles, said roller being arranged in a roller chamber (7) of the suction head (1) and being driven by the turbine (3),

a passage (8) connecting the roller chamber (7) and the turbine chamber (4), and

an output conduit (9) connected to the turbine chamber (4) in a tiltable manner and having a suction connection (10),

wherein: the turbine (3) is configured as a pelton turbine, and the suction air flow coming out of the channel (8) flows towards the turbine substantially tangentially, characterized by the following mutually coordinated arrangements:

1.1) the roller (6) is provided with bristles (5) whose ends are arranged in a zone formed by two concentric circular enveloping curves (a, b), the smaller enveloping curve (a) being at a distance of 1mm from the plane of the suction opening edge (2) in the region of the suction opening; the envelope curve (b) with the larger diameter intersects the plane of the suction opening edge (2) in the region of the suction opening and protrudes at the bottom by 2mm from said plane;

1.2) the distance (S) between the partition of the roller chamber (7) containing the channel (8) leading to the turbine chamber (4) and the bristles (5) of the rotating roller (6) at the narrowest point is at least 8 mm;

1.3) the ratio between the volume of the turbine chamber (4) and the volume occupied by the turbine device (3) is between 5: 1 and 13: 1, the diameter of the turbine (3) is between 45 and 60mm, and the length is greater than 40 mm.

2. Suction cleaning device according to claim 1, characterized in that the ratio of the volume of the turbine chamber (4) to the volume occupied by the turbine device (3) is in the range of 6: 1 to 8.5: 1.

3. Suction cleaning device according to claim 1 or 2, characterized in that the turbine extends substantially over the entire axial width of the turbine chamber (4).

4. Suction cleaning device according to claim 1 or 2, characterized in that the passage (8) to the turbine chamber (4) has an outlet of rectangular cross-section, 10 to 18mm wide and 14 to 18mm high.

5. Suction cleaning device according to claim 1 or 2, characterized in that the distance (L) between the roller (6) and the axis of rotation of the turbine (3) is 70 to 90 mm.

6. A suction cleaning device according to claim 1 or 2, characterized in that the roller (6) is arranged at a position offset from the centre of the suction opening.