EP2428149B1 - Suction cleaning device - Google Patents

Description

The invention relates to a Saugreinigungsvorrichtung with the features of the preamble of claim 1.

Vacuum cleaning devices with a suction head, which has a suction unit, and a dirt collecting container, which can be acted upon by the suction unit with negative pressure to form a suction flow, suction air sucked together with suction through a suction inlet into the dirt collecting and suction sucked air from the suction unit via one on the suction head Suction outlet can be discharged to the environment, are known for example in the form of so-called industrial vacuum cleaner, which are used in particular for the extraction of dusts on machinery and equipment. They have a dirt collecting container, which can be acted upon by a suction unit with negative pressure. As a result, a suction flow can be generated, under the action of which suction material, that is to say, in particular dusts, can be sucked into the dirt collecting container. For the separation of the entrained solids with the suction air, so in particular for the separation of dust particles, a filter device is usually arranged in the region of the flow connection between the dirt collecting container and the suction unit.

The operation of the suction unit is in particular when, with the aid of the suction unit, a suction flow can be achieved with a high volume flow, associated with a not inconsiderable noise. The noise is often amplified by the fact that often forms a pulsating suction flow.

A Saugreinigungsvorrichtung with the features of the preamble of claim 1 is from the document WO 97/13443 A1 known. It describes a vacuum cleaner whose suction unit in a suction head is arranged and applied to a dirt collector with negative pressure. Suction air can be sucked together with suction material via a suction inlet into the dirt collecting and the sucked suction air can be discharged via a arranged at the suction suction to the environment. At the Saugauslass a flow channels exhibiting sound insulation material is arranged and an electric motor of the suction unit is surrounded by flow channels having Schalldämmmaterial. The suction air can pass from the suction unit to the suction outlet via the flow channels of the sound insulation materials.

Object of the present invention is to develop a Saugreinigungsvorrichtung of the type mentioned in such a way that their noise can be kept low and the Saugreinigungsvorrichtung has a compact design and easy installation, maintenance and servicing.

This object is achieved by a Saugreinigungsvorrichtung with the features of claim 1.

In the suction cleaning device according to the invention, the suction unit is covered by a hood having the suction outlet. The suction air sucked in by the suction unit can be released to the environment via the suction outlet. Based on the suction flow upstream of the suction outlet, an outlet channel is arranged in the hood, which receives a silencer. The arranged within the hood exhaust passage with the muffler has a considerable noise reduction result. In addition, the arrangement of the outlet channel within the hood causes a higher mechanical stability of the entire suction head, since the outlet channel arranged upstream of the suction outlet is protected from mechanical damage by the hood.

The suction outlet may be disposed on an upper side of the suction head. This is particularly advantageous when the suction unit has an axial fan, which sucks the suction air in the axial direction, that is parallel to the axis of rotation of the fan of the suction unit and emits the sucked suction air in the axial direction. The axis of rotation of the axial fan can be vertically aligned, so that the suction air from the axial fan can be sucked from below in the vertical direction and then discharged vertically upward through the suction outlet. Between the suction outlet and the axial fan, the outlet channel can be positioned vertically aligned. The number of flow deflections, which experiences the suction air within the suction head, can be kept low. This in turn results in additional noise reduction.

Control electronics of the vacuum cleaning device are arranged in a housing formed by the hood of the suction head. This allows a compact design of Saugreinigungsvorrichtung, wherein the hood in addition to its noise-reducing function also has the function to provide a receiving space for the control electronics. According to the invention, the receptacle is designed as a recess formed in the hood, which is covered by a cover. The lid, which is detachably connected to the hood, allows easy access to the control electronics. This not only allows easy installation of Saugreinigungsvorrichtung but also facilitates their maintenance and servicing.

It is advantageous if the recess of the receptacle formed by the hood has side walls which are arranged at a distance from an outer wall of the hood. The preferably formed as a one-piece plastic molded part hood obtained by the spaced apart from the outer wall side walls of the recess a particularly high mechanical stability.

It is advantageous if the outlet channel is integrated in the hood. It can be provided, for example, that the outlet channel in combination with the hood forms a one-piece plastic molded part. As a result, the manufacturing cost can be kept low and the one-piece plastic molded part can have a considerable mechanical stability.

In a preferred embodiment, the outlet channel comprises a channel wall which is surrounded by an outer wall of the hood. In such an embodiment, the outer wall of the hood does not form part of the channel wall of the outlet channel, but the channel wall is arranged at a distance from the outer wall. As a result, the noise can be reduced.

It is advantageous if the silencer arranged in the outlet channel has at least one air-permeable sound-damping element which extends over the entire horizontal cross-section of the outlet channel. For example, it can be provided that the at least one sound-absorbing element forms a positive connection with the outlet channel.

It is advantageous if the at least one sound-damping element can be inserted into the outlet channel without tools. This facilitates the assembly of the Saugreinigungsvorrichtung.

The at least one sound-absorbing element is made of a foam in an advantageous embodiment of the invention. Preferably, a foamed plastic material is used as foam. In particular, a flame retardant plastic material is advantageous.

The at least one sound-damping element preferably has a plurality of through-channels. The individual through channels are arranged at a distance from each other. Preferably, they have a straight course. It can be provided, for example, that the through-channels in each case parallel to Rotary axis of the suction unit are aligned. In particular, a vertical orientation is preferred.

It can be provided that a single sound-absorbing element is arranged in the outlet channel. It is more favorable, however, if several sound-absorbing elements are arranged one above the other in the outlet channel. The size of the individual sound insulation elements can be kept low. This facilitates their handling during assembly of the Saugreinigungsvorrichtung.

The individual sound-absorbing elements can each have a plurality of through-channels, with at least some through-channels of noise-damping elements abutting directly against one another only partially overlapping. When using several sound insulation elements, these can be stacked in the outlet channel. If the soundproofing elements each have a plurality of passage channels, then it is favorable if at least some of the throughflow channels of acoustically damping elements which adjoin one another directly only partially overlap. This reinforces the sound insulation producible by means of the sound insulation elements.

It can be provided, for example, that in the outlet channel a plurality of identically designed sound insulation elements are arranged one above the other, each having a plurality of passage channels and are rotated relative to a longitudinal axis of the outlet channel relative to each other. In such an embodiment, two directly abutting sound insulation elements on a different angular position with respect to the longitudinal axis of the outlet channel. This has the consequence that arranged radially offset from the longitudinal axis of the outlet passage passages of the soundproofing elements overlap each other only partially. The soundproofing elements can preferably be inserted into the outlet channel without tools. When inserting then only has to be taken to ensure that the sound-absorbing elements have a different angular position relative to the longitudinal axis of the outlet channel. The installation of the soundproofing is thus very simple and yet can be achieved by means of the outlet channel superimposed soundproofing elements a strong noise reduction.

The muffler fills the volume of the outlet channel in an advantageous embodiment of the invention to at least 75%. In particular, a filling of the outlet channel to more than 85%, preferably to more than 90% is to achieve a high noise reduction advantage. In particular, it can be provided that the outlet channel is almost completely filled by one or more sound insulation elements.

The suction unit of the vacuum cleaning device has an electric motor, in particular a three-phase motor, which drives a suction fan of the suction unit. As already mentioned, an axial fan is preferably used. With regard to a particularly strong noise reduction, it is advantageous if the electric motor is surrounded by an annular wall to form an annular space. The annular wall can be aligned concentrically with a cylindrical motor housing. The motor housing may have on the outside cooling fins which project into the annular space which is arranged between the electric motor and the annular wall. Cooling air can be supplied to the electric motor via the annular space.

Conveniently, the annular wall is integrated in the hood. For example, it can be provided that the annular wall in combination with the hood forms a one-piece plastic molded part.

The outlet channel is preferably arranged laterally next to the annular wall surrounding the electric motor, wherein a channel wall of the outlet channel is rigidly connected to the annular wall. In particular, in one embodiment of the invention, in which the hood is integrally connected to the channel wall of the outlet channel and the annular wall, a rigid connection between the channel wall and the annular wall has been found to increase the mechanical stability of the one-piece plastic molding as favorable.

To control the suction unit, the vacuum cleaning device has control electronics. Conveniently, the control electronics also serves to electrically control a filter cleaning device, with which a filter material arranged in the flow area between the dirt collecting container and the suction unit can be cleaned. With the suction flow entrained solids can be deposited during normal suction on the filter material. This leads with increasing operating time to an increase in the flow resistance of the filter material. It is therefore necessary to clean the filter material from time to time. For cleaning, a controllable by the control electronics Filterabreinigungsvorrichtung can be used.

It may be provided, for example, that between the filter device and the suction unit, a suction is arranged, in which opens at least one closable by a closing valve forced air inlet, wherein by opening the closing valve, the clean side of the filter device can be acted upon with external air. At least part of the inflowing external air can flow through the filter device in the counterflow direction, ie counter to the direction of the suction flow which occurs during normal suction operation. This assists in the removal of solids from the side of the filter device facing the dirt collector. The at least one closing valve is in this case only briefly opened, so that the inflowing external air impinges the filter device jerky. The at least one closing valve is then closed again, so that a negative pressure forms again in the suction region under the effect of the suction unit. The at least one closing valve can be designed as a solenoid valve, which is controllable by the control electronics.

Figur 1:

eine perspektivische Darstellung einer Saugreinigungsvorrichtung mit einem Unterteil und einem Oberteil, die an einem fahrbaren Gestell gehalten sind;

Figur 2:

eine Schnittansicht des Oberteils der Saugreinigungsvorrichtung aus Figur 1;

Figur 3:

eine vergrößerte Teilschnittansicht eines Saugkopfes der Saugreinigungsvorrichtung aus Figur 1;

Figur 4:

eine perspektivische Darstellung einer Haube des Saugkopfes aus Figur 3 schräg von oben;

Figur 5:

eine perspektivische Darstellung der Haube des Saugkopfes aus Figur 3 schräg von unten und

Figur 6:

eine perspektivische Darstellung nach Art einer Explosionszeichnung eines von einem Gitter abgedeckten Schalldämpfers des Saugkopfes aus Figur 3.

The following description of a preferred embodiment of the invention serves in conjunction with the drawings for further explanation. Show it:

FIG. 1:

a perspective view of a Saugreinigungsvorrichtung with a lower part and a top part, which are held on a movable frame;

FIG. 2:

a sectional view of the upper part of the Saugreinigungsvorrichtung from FIG. 1 ;

FIG. 3:

an enlarged partial sectional view of a suction head of Saugreinigungsvorrichtung from FIG. 1 ;

FIG. 4:

a perspective view of a hood of the suction head FIG. 3 diagonally from above;

FIG. 5:

a perspective view of the hood of the suction head FIG. 3 diagonally from below and

FIG. 6:

a perspective view in the manner of an exploded view of a grid covered by a silencer of the suction head FIG. 3 ,

In the drawing, a suction cleaning device 10 according to the invention is shown schematically with an upper part 12 and a lower part 14, which are mounted on a movable frame 16. The lower part 14 forms a dirt collecting container 18 and the upper part 12 comprises a suction head 20 and an inlet chamber 22 arranged between the suction head 20 and the dirt collecting container 18, which, like the suction head 20 and the dirt collecting container 18, is substantially cylindrical. In the inlet chamber 22 opens with a substantially tangential orientation with respect to a vertical center axis 24 of the Saugreinigungsvorrichtung 10, a suction nozzle 26, which forms a suction inlet 28 of the Saugreinigungsvorrichtung 10. In the inlet chamber 22, a funnel-shaped flow screen 30 is disposed, and above the flow guide wall 30, a filter device 32 is inserted into the inlet chamber.

The filter device 32 comprises a first filter unit in the form of a first flat-fold filter 34 and a second filter unit in the form of a second flat-fold filter 36, which are covered on their clean side facing away from the dirt collecting container 18 by a grid-like or net-like, rigid support member 38. Like the first flat-fold filter 34 and the second flat-fold filter 36, the support member 38 is fixed to a rigid filter support 40, which has a retaining ring 41 extending over the entire circumference of the filter support 40. The filter device 32 can be inserted into the inlet chamber 22 from above, that is to say from the side facing away from the dirt collecting container 18. Here, the retaining ring 41 sits with the interposition of a lower sealing ring 42 on an upper, the dirt collecting container 18 facing away edge 44 of the inlet chamber 22. The retaining ring 41 in turn takes the suction head 20 which is seated with a support ring 48 facing the inlet chamber 22 with the interposition of an upper sealing ring 50 on the retaining ring 41. With the help of several, over the circumference of the inlet chamber 22 arranged distributed clamping bracket 52 of the suction head 20 can be clamped without tools with the interposition of the retaining ring 41 of the filter device 32 with the inlet chamber 22.

The dirt collector 18 is located with its upper edge 54 in his in FIG. 1 shown operating position sealingly on a lower edge 56 of the inlet chamber 22 at. With the help of a lifting mechanism, not shown in the drawing, the dirt collector 18, starting from its in FIG. 1 shown operating position are lowered into a maintenance position in which he occupies a distance to the lower edge 56 of the inlet chamber 22 with its upper edge 54 and can be separated from the upper part 12 for emptying.

The suction head 20 comprises a cylindrical base 58 adjoining the support ring 48, the interior of which is subdivided by an intermediate wall 59 oriented perpendicular to the central axis 24 into a suction region 60 facing the filter device 32 and a ventilation region 61 facing away from the filter device 32. The base 59 is followed by a hood 62 which covers the base 58. As in particular from the Figures 3 . 4 and 5 is clear, the hood 62 comprises an outer wall 64, which surrounds both a concentric to the central axis 24 aligned, central annular wall 66 and a laterally offset from the annular wall 66 and rigidly connected to this channel wall 68. The channel wall 68 defines an outlet channel 70 whose longitudinal axis 72 is aligned parallel to the central axis 24. In addition to the outer wall 64, the hood 62 on a ceiling wall 74 which is integrally connected to the outer wall 24 and from the dirt collecting container 18 facing bottom 75, the central annular wall 66 and the channel wall 68 protrude. The hood 62 with the outer wall 64, the annular wall 66, the channel wall 68 and the top wall 74 is formed as a one-piece plastic molded part. At the level of the central annular wall 66, the outer wall 64 on its The outlet channel 60 facing away from a substantially rectangular receptacle in the form of a recess 77 which is covered by a lid 78. About several connecting screws 79, the lid 78 is detachably connected to the hood 62. In the recess 77, an electronic control unit 80 is arranged and the lid 78 carries on its outer side a main switch 82, with which the vacuum cleaning device 10 can be switched on and off.

The annular wall 66 surrounds an electric motor 84, in the illustrated embodiment a three-phase motor, which drives an axial fan 86 surrounded by the base 58 of the suction head 20. The axial fan 86 comprises a fan housing 88 which is in fluid communication with the suction area 60 via an inlet line 90 and with the outlet channel 70 via an outlet line 92 and which surrounds a fan wheel, not shown in the drawing to achieve a better overview, which is driven by the electric motor 84 Rotation can be offset.

Via the inlet line 90, the suction area 60, the filter device 32 and the inlet chamber 22, the dirt collecting container 18 can be subjected to negative pressure by the axial fan 86, so that suction air can be sucked into the dirt collecting container 18 via the suction nozzle 26 together with entrained suction material. The suction air can flow through the filter device 32 and reach the axial fan 86 via the inlet line 90. From this, the suction air can then be discharged via the outlet line 92 and the outlet channel 70 to the environment. For this purpose, the outlet channel 70 opens into a suction outlet 94, which is arranged in the top wall 74 of the hood 62 and covered by a protective grid 96.

In order to keep the noise development of the vacuum cleaning device 10 as low as possible, a muffler 98 is arranged in the outlet channel 70 with three identical sound insulation elements 101, 102 and 103 positioned one above the other. The sound insulation elements 101, 102, 103 are designed as cylindrical disks and made of a foam. They each have one coaxial with the longitudinal axis 72 aligned central passageway 105 which is surrounded by a plurality of, in the illustrated embodiment, each of seven offset from the longitudinal axis 72 arranged lateral passageways 107. The lateral passageways 107 are just like the central passageway 105 rectilinear and parallel to the longitudinal axis 72 aligned. As in particular from FIG. 6 becomes clear, the sound insulation elements 101, 102 and 103 differ only by their angular position relative to the longitudinal axis 72. This has the consequence that the lateral passageways 107 of directly abutting Schalldämmelementen 101, 102 and 102, 103 overlap only partially. While the aligned to each other central passageways 105 of the three Schalldämmelemente 101, 102 and 103 define a rectilinear central flow path for the suction, forming in different angular position to each other lateral passageways 107 of the three Schalldämmelemente 101, 102 and 103 a kind of flow labyrinth with each other only in pairs partially overlapping flow cross sections.

As in particular from FIG. 3 becomes clear, fill the Schalldämmelemente 101, 102 and 103, the exhaust passage 70 almost completely, the volume of the exhaust passage 70 is filled in the illustrated embodiment to at least 90% of the sound insulation elements 101, 102 and 103.

As already mentioned, a suction flow can be achieved during operation of the vacuum cleaning device 10 by the axial fan 86, wherein suction material can be transferred together with sucked suction air into the dirt collecting container 18. Solids entrained by the suction air can be deposited on the dirt side of the flat-fold filters 34 and 36 facing the dirt-collecting container 18. The sucked suction air can be discharged via the outlet channel 70 and the Saugauslass 94 to the environment.

For cleaning the filter device 32, the suction cleaning device 10 has a filter cleaning device, which differs from that in the recess 77 of the Hood 62 arranged control electronics 80 can be controlled. In each case above a flat-fold filter 34 or 36, it comprises a forced-air inlet 118 formed in the intermediate wall 59 of the suction head 20, via which the suction region 60 adjoining the filter device 32 in the flow direction of the suction air is in fluid communication with the ventilation region 61. The ventilation area 61, in turn, is in fluid communication with the environment via apertures, not shown in the drawing, of the suction head 20. This gives the possibility of supplying external air to the suction region 60 in order to clean off the flat-fold filters 34, 36. The forced air inlets 118 can each be closed with the aid of a closing valve 120 and can be opened for filter cleaning for a short time. By opening the closing valves 120, the dirt collecting container 18 facing clean sides of the flat pleated filters 34, 36 are subjected to external air. This leads to a mechanical vibration of the flat pleated filters 34, 36 and in addition flows through at least a portion of the external air, the flat pleated filter 34, 36 in the counterflow direction, that is contrary to the prevailing during normal suction operation flow direction of the suction air. As a result, solids which adhere to the dirt collecting container 18 facing the dirty side of the flat pleated filter 34, 36, be cleaned. After filter cleaning, the closing valves 120 are closed again. The actuation of the closing valves 120 takes place by means of electromagnets which are controlled by the control electronics 80. Such closing valves are known to those skilled in the art and therefore require no further explanation in the present case.

The axial fan 86 in combination with the electric motor 84, a suction unit 110 which is covered by the hood 62. By providing the hood 62 with integrated annular wall 66 surrounding the electric motor 84 in the circumferential direction, and the integrated duct wall 68 defining the exhaust duct 70 in which the sound insulating members 101, 102 and 103 are disposed, the noise of the vacuum cleaner 10 can be low being held. The channel wall 68 of the outlet channel 70 as well as the annular wall 66 is surrounded by the outer wall 64 of the hood 62 and between the annular wall 66 and an in FIG. 3 shown motor housing 112 extends an annular space 114, via which the electric motor 84 cooling air can be supplied. Cooling ribs 116 arranged on the outside of the motor housing 112 extend radially into the annular space 114 and assist in cooling the electric motor 84.

The Saugreinigungsvorrichtung 10 is characterized by an effective suction and a low noise. Noise is minimized by the provision of hood 62 with integral annular wall 66 and integral channel wall 68, with further noise reduction achieved by the provision of muffler 98 inserted into hood 62.

Claims (12)

1. A suction cleaning device with a suction head (20) which has a suction unit (110), and with a dirt collection container (18) which can be subjected to a partial vacuum by the suction unit (110) in order to form a suction flow, wherein suction air together with suction material can be drawn into the dirt collection container (18) via a suction inlet (28) and the drawn-in suction air can be discharged to the surroundings by the suction unit (110) via a suction outlet (94) arranged on the suction head (20), wherein the suction head (20) has a hood (62) which covers the suction unit (110) and has the suction outlet (94), wherein an outlet channel (70) is arranged in the hood (62) upstream from the suction outlet (94), in which channel a sound damper (98) is positioned, characterised in that the hood (62) forms a receptacle (77) for control electronics (80) of the suction cleaning device (10), the receptacle being configured as a recess (77) formed into the hood (62), which recess is covered by a cover (78).
2. A suction cleaning device according to Claim 1, characterised in that the outlet channel (70) is integrated into the hood (62).
3. A suction cleaning device according to Claim 1 or 2, characterised in that the outlet channel (70) has a channel wall (68) which is surrounded by an outer wall (64) of the hood (62).
4. A suction cleaning device according to Claim 1, 2 or 3, characterised in that the sound damper (98) has at least one air-permeable sound-damping element (101, 102, 103) which extends over the entire horizontal cross-section of the outlet channel (70).
5. A suction cleaning device according to Claim 4, characterised in that the at least one sound-damping element (101, 102, 103) is manufactured from a foam.
6. A suction cleaning device according to Claim 4 or 5, characterised in that the at least one sound-damping element (101, 102, 103) has a plurality of through-channels (105, 107).
7. A suction cleaning device according to Claim 4, 5 or 6, characterised in that a plurality of sound-damping elements (101, 102, 103) are arranged one above the other in the outlet channel (70).
8. A suction cleaning device according to Claim 7, characterised in that the sounddamping elements (101, 102, 103) in each case have a plurality of through-channels (105, 107), with at least some through-channels (107) of directly adjoining sounddamping elements (101, 102; 102, 103) only partially overlapping.
9. A suction cleaning device according to one of Claims 4 to 8, characterised in that the sound damper (98) fills at least 75% of the volume of the outlet channel (70).
10. A suction cleaning device according to one of the preceding claims, characterised in that the suction unit (110) has an electric motor (94) which is surrounded by an annular wall (66), forming an annular space (114).
11. A suction cleaning device according to Claim 10, characterised in that the annular wall (66) is integrated into the hood (62).
12. A suction cleaning device according to Claim 10 or 11, characterised in that the outlet channel (70) is arranged laterally next to the annular wall (66), a channel wall (68) of the outlet channel (70) being connected rigidly to the annular wall (66).

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