WO2005016106A1

WO2005016106A1 - Vacuum cleaner with exhaust air flow channels

Info

Publication number: WO2005016106A1
Application number: PCT/EP2004/008952
Authority: WO
Inventors: Erich Bott; Roland Illig; Anja NIEDERGESÄSS
Original assignee: BSH Bosch und Siemens Hausgeräte GmbH
Priority date: 2003-08-11
Filing date: 2004-08-10
Publication date: 2005-02-24
Also published as: EP1656061B1; CN100475118C; DE10336828A1; DE10336828B4; ATE533391T1; RU2330597C2; EP1656061A1; ES2374397T3; CN1835706A; RU2006103276A

Abstract

The invention relates to a vacuum cleaner, comprising a housing (1) and an exhaust opening (36) for an exhaust flow, connected to a pressurised side of a motor/fan unit (27) by means of a flow channel (21) which has a branched embodiment to divide the exhaust flow into at least one first part channel (33) and a second part channel (61). According to the invention, a high noise reduction in the exhaust flow may be achieved with low complexity, whereby the first part channel (33) and the second part channel (61) are combined before the exhaust opening (36). An effective noise reduction is achieved, essentially without additional complex baffle devices.

Description

Vacuum cleaner with exhaust air flow channels

The invention relates to a vacuum cleaner according to the preamble of claim 1.

From DE 38 15 320 A1 a vacuum cleaner is known which is provided within its device housing with a dust collecting space and a blower space arranged downstream in terms of space and flow, from which the air conveyed by an engine fan flows out through a blow-out duct. In order to achieve high noise damping with little effort, deflection devices are arranged in the blow-out duct. A pipe component is divided into several longitudinal channels in the direction of flow. The pipe component is divided into two trains, one train each gripping laterally next to a through opening integrated in the device housing and only being led back from there to the respective blow-out openings. However, it is disadvantageous here that a swirling of the blow-out air generated by the deflection devices arranged in the blow-out duct is at least partially equalized again in the longitudinal ducts of the pipe component that follow on the downstream side, as a result of which the noise damping is not optimal.

The object of the invention is to enable a high level of noise reduction in the exhaust air flow with little effort. In particular, noise reduction should be achieved essentially without additional, complex deflection devices. A vacuum cleaner with such a noise reduction should also be inexpensive to manufacture.

According to the invention, this object is achieved in that a first sub-channel and a second sub-channel of a flow channel for the exhaust air flow are brought together in front of the blow-out opening of the vacuum cleaner.

By merging at least two partial air flows, the partial air flows are swirled, so that a lot of energy is removed from the air flow and the flow velocity is reduced. The noise level at the outlet of the blow-out opening is then lower, since the exhaust air flow emerges from the blow-out opening at a lower exit speed. By swirling the partial air flows against each other, separate deflection devices for influencing the flow can be dispensed with. The second subchannel is preferably connected to the first subchannel on the flow side. The at least two subchannels can end at a common connection point on the downstream side at the common blowout opening, but it is advantageous if the second subchannel already opens into the first subchannel before this first subchannel has reached the blowout opening. This is achieved by fluidically connecting the second subchannel on the downstream side to the first subchannel. This has the advantage that the high turbulence of the first and second partial air flows does not take place directly in the vicinity of the blow-out opening, but at a clear distance from the blow-out opening, preferably in an area that is located far inside in the vacuum cleaner and is therefore particularly well soundproofed. By connecting the second subchannel to the first subchannel clearly before reaching the blow-out opening, it is prevented that noises that could arise in the swirl zone can reach the outside directly via the blow-out opening.

The second subchannel can in particular form at least one secondary flow channel which opens into the first subchannel which forms a main flow channel. A sub-flow channel is to be understood as any sub-channel that promotes a smaller amount of air than an assigned main flow channel. A bypass duct is preferably designed in such a way that the exhaust air stream flowing in the bypass duct flows at a higher speed than an exhaust air stream in the main flow duct.

The secondary flow channel is preferably connected to the main flow channel in such a way that a secondary air flow fed into the main flow channel via the secondary flow channel crosses the main air flow. A particularly effective swirling is achieved by crossing the flow directions of the secondary air flow and the main air flow. The crossing is preferably carried out by vertically colliding air streams. The secondary air flow and main air flow can, however, also cross at a different angle to one another, for example either at an acute angle to one another or even at an obtuse angle to one another. The secondary air flow and main air flow could even be directed towards one another. The main flow channel is advantageously arranged to run behind an end of the motor / blower unit opposite an intake opening. Due to this position of the main flow channel, the main air flow can be fed centrally to the motor / blower unit in the direction of the blow-out opening. If several secondary flow channels are provided, these can be connected to the main flow channel in the same length. The same length of the bypass flow channels ensures that the swirl effect at each intersection of the bypass air flow and the main air flow is at least approximately the same.

Two bypass channels are preferably provided, which are arranged to run on opposite sides of the motor / blower unit. However, it is also possible for a plurality of bypass ducts, each in pairs, to be arranged running on opposite sides of the motor / blower unit, which preferably open into a common main flow duct.

The at least two secondary flow channels can have a rectangular cross section and can be arranged to extend essentially vertically. This arrangement results in a good draft in the secondary flow channels and the housing part of the vacuum cleaner which has the secondary flow channels is nevertheless simple and inexpensive to produce.

Each secondary flow channel is preferably connected to the main flow channel via at least one inflow opening. The inflow opening can be designed as a circular bore in a thin intermediate wall between the secondary flow channel and the main flow channel. This creates a sharp-edged orifice in the area of the inflow opening, on which there is an additional swirling of the exhaust air flow. The free opening cross section of the inflow opening can preferably be smaller than the flow cross section in the rest of the secondary flow channel. In a preferred embodiment of the invention, the opening cross section of the at least one inflow opening is smaller than the flow cross section of the respective secondary flow channel. This results in a constriction of the

^'' Flow cross-section in the transition area of the secondary flow channel into the main flow channel. Such a throttle point can also be in the form of a Venturi nozzle be trained. Instead of a single inflow opening, a plurality of in particular two inflow openings can be provided in each side flow channel. The sum of the opening cross sections of the two or more inflow openings should nevertheless be smaller than the flow cross section in the rest of the secondary flow channel.

In a simple manner, the at least one secondary flow channel and / or the main flow channel can be arranged to run between a housing part of a blower housing and a capsule part of an insulating capsule. So no separate components are required to represent the secondary flow channels or the main flow channel. The boundary walls of these flow channels are then formed by the existing walls of the housing part of a blower housing or a capsule part of an insulating capsule.

The housing part of the blower housing and the capsule part of the insulating capsule are preferably formed in one piece. There are no steps or edges on the inner wall of the secondary flow channels or the main flow channel, as would be the case with assembled components with parting lines. In the case of the one-piece design, the inner walls of the secondary flow channels or of the main flow channel can be smooth-walled, as a result of which no undesired interference flows can be caused. The housing part can advantageously be a blower compartment cover.

A preferred embodiment of the invention is explained in more detail below with reference to FIGS. 1 to 5.

Show it:

Figure 1 is a perspective view of a lower shell of a vacuum cleaner according to the invention;

FIG. 2 shows a top view of the lower shell from FIG. 1; Figure 3 shows a cross section through a vacuum cleaner according to the invention with a lower shell according to Figures 1 and 2;

FIG. 4 shows a perspective view of a blower compartment cover according to the invention;

Figure 5 shows a cross section through the longitudinal axis of a vacuum cleaner according to the invention.

An embodiment of a vacuum cleaner according to the invention has a housing 1, the lower shell 2 of which is shown in FIG. The lower shell 2 is trough-shaped with a bottom surface 3 and a peripheral shell wall 4. The

Shell wall 4 extends essentially vertically upwards from an edge region of the bottom surface 3. At a front end of the lower shell 1 is on the

Outside of the shell wall 4, a handle 5 is molded onto the lower shell 2. A partition 6 is approximately in a central area between the front end 7 of the

Lower shell 2 and a rear end 8 of the lower shell 2 in the interior of the

Lower shell 2 arranged. The partition 6 extends from a first side wall section 9 shown at the left in FIG. 1 to a second side wall section 10 of the shell wall 4 shown at the rear on the right. The partition 6 divides the lower shell 2 into a front dust collection chamber 11 and a rear blower chamber

12. The partition 6 has an inflow funnel 13 through which suction air from the

Dust collection chamber 11 is sucked into the blower chamber 12.

A first capsule part 14 is molded onto the lower shell 2 in the blower chamber 12. The first capsule part 14 is formed by wall sections 15a, 15b and 15c of the first capsule part 14, by a part of the partition 6 and a bottom part 3a of the bottom surface 3 enclosed by the wall sections 15a, 15b and 15c of the first capsule part 14. The rear wall section 15b has a cutout which is open at the edge and forms a first holding section 16 for a first bearing element 17 shown in FIG. The side wall sections 15a and 15c each have an opening 18a and 18b, which establish a flow connection between an interior space 19 delimited by the first capsule part 14 and a channel section 20 of a flow channel 21. The channel section 20 and part of the flow channel 21 are of the Wall sections 15a, 15b and 15c of the first capsule part 14 and wall sections 22a, 22b and 22c of a blower unit space 22 are laterally limited. The side wall sections 22a and 22c of the blower unit compartment 22 adjoin the rear wall sections 22b and extend forward to the partition wall 6 and form in the lower shell 2 a bowl-shaped, by means of an airtight, blower chamber cover, described in more detail in FIG. 4, one closed blower unit space 22. A second holding section 24 is formed on the partition 6 below a passage opening 23 and forms a shoulder 25 projecting into the blower space 12. The paragraph 25 is half-shell-shaped and open at the top. It extends along a circular ring line concentric with the passage opening 23. In the paragraph 25, a second bearing element 26 can be inserted, which together with the first bearing element 17 accommodates a motor / blower unit 27 shown in FIG.

In Figure 2, the flow pattern is indicated by arrows P1 to P6. The motor / blower unit 27 is shown in the installed position between the wall sections 15a, 15b and 15c in the lower shell 2. Air which has been cleaned of dust by means of a filter bag or a dust removal box (not shown) is removed from the dust collection chamber 11 into the inflow funnel 13, as indicated by the arrows P1, from the front dust collection chamber 11 shown on the right in FIG. 2 into the rear, blower chamber 12 shown on the left in FIG. 2. The sucked-in air is passed through the partition 23 through the partition 6 and fed to a suction opening 28 of the motor / blower unit 27, as indicated by arrow P2. The sucked-in air flows through the motor / blower unit 27 and, at a rear end, as indicated by the arrows P3, out of the motor / blower unit 27 and into an inner duct section 28. In the inner duct section 28, the air flows forward between the housing wall of the motor / blower unit 27 and the wall sections 15a and 15c of the first capsule part 14 to the openings 18a and 18b. After the forward-flowing air has entered the outer channel section 20 through the openings 18a and 18b from the inner channel section 28, the direction of flow reverses, as indicated by the arrows P4, and the air now flows from front to rear in the outer channel section 20 backwards. In the outer duct section 20, the air at the rear end of the motor / blower unit 27 is deflected at a right angle, as indicated by the arrows P5, behind the wall section 15b of the first capsule part 14. The arrows P6 indicated in FIG. 2 indicate that the air at the end of the outer duct section 20 behind the motor / blower unit 27 is deflected in a direction which emerges from the plane of the drawing in FIG. 2, between a vertical wall section 29a of a second capsule part 30 and a wall 31 of a blower compartment cover 32 as shown in FIG. 3.

FIG. 3 shows a cross section through a vacuum cleaner according to the invention with the lower shell 2 from FIGS. 1 and 2. The arrows P6 shown in FIG. 2 emerging from the plane of the drawing appear in FIG. 3 as an upward arrow P6. The air flows in the direction of arrow P6 in a main flow channel 33 running between the wall sections 29a of the second capsule part 30 and the wall 31 of the blower chamber cover 32. Behind the rear end of the motor / blower unit 27, the air inside the main flow channel 33 is led upward and deflected in a horizontal flow direction at the upper end of the vertical wall section 29a. The main flow channel 33 then runs along a horizontal wall section 29b of the second capsule part 30 below the blower chamber cover 32 to an inflow opening 34 below a blow-out filter 35. The outflow filter 35 abuts the inflow opening 34 with its upstream surface. Residual particles that are still contained in the air stream can be separated off at the blow-out filter 35. Behind the outflow-side surface of the blow-out filter 35, the cleaned air flow leaves the vacuum cleaner via a plurality of blow-out openings 36, which is designed as a louvered blow-out grille.

The handle 5, the dividing wall 6, and also the wall sections 15 of the first capsule part 14 and the wall sections 22 of the blower chamber 12 are molded onto the lower shell 2, which is produced as a one-piece plastic injection-molded part. An upper shell 37 covers the blower chamber 12 and a cable chamber 38 for receiving a cable drum 39 (shown in FIG. 4). The upper outer contour of the vacuum cleaner is completed by a dust chamber cover 40, which attaches to the upper shell 37 and extends from a rear end 41 in the vicinity of the blow-out opening 36 to a front end 42. The front end 42 of the dust chamber cover 40 has a locking element 43 which fixes the pivotably mounted dust chamber cover 40 to the lower shell 2 in a closed position by means of a counter-latching element 44. A Shaped on the dust chamber cover 40, the dust collecting chamber 11 encircling cover wall 45 protrudes into a groove 46 encircling the dust collecting chamber 11, in which a sealing cord 47 is inserted. The groove 46 is formed on an upper end of a dust chamber wall 48 which is molded onto the base shell 2 and surrounds the dust collecting chamber 11. A dust air opening 49 is introduced in the dust chamber cover 40, to which a suction hose connector (not shown) can be connected. A niche 50, which is open to the outside, for accommodating accessories 54a, 54b, such as crevice nozzles, upholstery nozzles, furniture brushes or instructions for use or information sheets, is formed on the dust chamber cover 40. The recess 50, which is open to the outside, is covered by an accessory cover 52 mounted on the dust chamber cover 40 by means of a pivot bearing 51. A receptacle pallet 53, which is preferably made from a flat, thermoplastic plastic film and is molded into a spatial structure by the blowing process, can be removably inserted in the recess 51 for the correct attachment of the accessories 54a, 54b.

FIG. 4 shows a blower compartment cover 32 according to the invention in a perspective view. The blower chamber cover 32 is designed as an approximately cuboidal shell body. A first side wall section 56 shown on the right in FIG. 4 and a second side wall section 57 shown on the left in FIG. 4, as well as a rear rear wall section 58 adjoin perpendicular to an upper ceiling wall 55. The first side wall section 56, the second side wall section 57 and the rear wall section 58 are connected to one another at their side edges to form a U-shaped side wall 59 of the blower chamber cover 32. The inflow opening 34 is integrated in the ceiling wall 55. The front wall section 29d of the second capsule part 30 is formed on one end of the ceiling wall 55 shown in FIG. 4 by means of a connecting web 59. The front wall section 29d of the second capsule part 30 is connected laterally to the first wall section 56 and the second wall section 57 of the blower chamber cover 32. The front wall section 29d is shaped like a semicircular disk and has a semicircular cutout 60 which is open at the edge for receiving the second bearing element 26 of the motor / blower unit 27. Opposite the front wall section 29d, the rear vertical wall section 29a of the second capsule part 30 is molded onto the blower compartment cover 32. Between the rear vertical wall portion 29a of the second capsule part 30 and the rear rear wall portion 58 of the blower compartment cover 32 The main flow channel 33 runs in the direction of the inflow opening 34 in the ceiling wall 55. Between the wall sections 29a and 29d, two vertical side wall sections 29b and 29c are integrally formed on the blower chamber cover 32. A first secondary flow channel 61a extends between the side wall section 29c and the first side wall section 56. A second secondary flow channel 61b runs between the side wall section 29b and the second side wall section 57.

FIG. 5 shows the first secondary flow channel 61a and the second secondary flow channel 61b in a cross section through the longitudinal axis of the vacuum cleaner according to the invention. The lower shell 2 with the molded-on wall sections 22a and 22c of the blower chamber 12 is shown. Inside the blower chamber 12, the wall sections 15a and 15c of the first capsule part 14 are molded onto the bottom surface 3. The first secondary flow channel 61a is delimited by the wall section 22a and the wall section 15a. As indicated by arrows P8, a first secondary air flow flows upward in the secondary flow channel 61a, between the wall section 29c and the first side wall section 56 of the blower chamber cover 32, and a second secondary airflow flows upward in the secondary flow channel 61b, between the wall section 29b and the second side wall section .57 of the blower compartment cover 32. A groove-shaped sealing arrangement 63 is formed on a lower edge 62 of the side wall sections 56 and 57, and of the rear wall section 58 (not shown). An upper peripheral edge 64 of the wall sections 22a, 22b and 22c engages in the groove. Alternatively, a sealing cord, not shown, can be inserted into the groove. The sealing arrangement 63 closes a parting line between the blower chamber cover 32 and the blower chamber 12. A further sealing arrangement 65 is provided between the first capsule part 14 and the second capsule part 30. The sealing arrangement 65 is designed as a labyrinth seal. For this purpose, the wall sections 15a, 15b and 15c of the first capsule part 14 partially cover the wall sections 29a, 29b and 29c of the second capsule part 30.

The secondary air flows flowing vertically upwards along the arrows P8 enter the main flow channel 33 via inflow openings 66. The secondary air flows, as indicated by the arrows P9, meet the main air flows P7 perpendicularly. The arrow P7 shown in FIG. 3 as running from left to right appears in FIG. 5 as arrows P7 emerging from the plane of the drawing. Through the vertical When the secondary air flows P9 and the main air flows P7 meet, the air is swirled and, as indicated by the arrows P10, enters the inflow opening 34 in a diffuse flow. Above the inflow opening 34, the blow-out filter 35 is inserted into a holder 67 (FIG. 4) molded onto the blower chamber cover 32. The holder has a peripheral edge shoulder 68, on which a seal 69 is formed, on which the blow-out filter 35 rests in a sealing manner. As shown in FIG. 4, not only the holder 67 but also a cable run 70 is integrally formed on the blower compartment cover 32.

Claims

claims

1. Vacuum cleaner with a housing (1) and a blow-out opening (36) for an exhaust air flow, which is fluidically connected to an overpressure side of a motor / blower unit (27) via a flow channel (21) which is used to divide the exhaust air flow into at least a first one Sub-channel (33) and a second sub-channel (61) is branched, characterized in that the first sub-channel (3) and the second sub-channel (61) are brought together in front of the blow-out opening (36).

2. Vacuum cleaner according to claim 1, characterized in that the second sub-channel (61) is connected on the outflow side to the first sub-channel (33) in terms of flow technology.

3. Vacuum cleaner according to claim 1 or 2, characterized in that the second sub-channel (61) forms at least one side flow channel (61a, 61 b) which opens into the first sub-channel (33) forming a main flow channel.

4. Vacuum cleaner according to claim 3, characterized in that the secondary flow channel (61a, 61b) is connected to the main flow channel (33) in such a way that a secondary air flow supplied via the secondary flow channel (61a, 61b) into the main flow channel (33) crosses the main air flow.

5. Vacuum cleaner according to one of claims 3 or 4, characterized in that the main flow channel (33) behind an intake opening (72) opposite end of the motor / blower unit (27) is arranged to extend.

6. Vacuum cleaner according to one of claims 1 to 5, characterized in that at least two secondary flow channels (61a, 61b) are provided, which is arranged on opposite sides of the motor / blower unit (27).

7. Vacuum cleaner according to claim 6, characterized in that the at least two secondary flow channels (61a, 61b) have a rectangular cross section and are arranged to extend substantially vertically.

8. Vacuum cleaner according to claim 7, characterized in that each secondary flow channel (61a, 61b) is connected to the main flow channel (33) via at least one inflow opening (66).

9. Vacuum cleaner according to claim 8, characterized in that the opening cross section of the at least one inflow opening (66) is smaller than the flow cross section of the respective side flow channel (61a, 61b).

10. Vacuum cleaner according to one of the preceding claims, characterized in that the at least one secondary flow channel (61a, 61b) and / or the main flow channel (33) between a housing part of a blower housing (12) and a capsule part (14, 30) of an insulating capsule (71 ) is arranged progressively.

11. Vacuum cleaner according to claim 10, characterized in that the housing part of the blower housing (12) and the capsule part (14, 30) of the insulating capsule (71) are integrally formed.

12. Vacuum cleaner according to claim 10 or 11, characterized in that the housing part is a blower chamber cover (32).