Personalized air purification device

Abstract

Personalized air cleaning device (1) having a housing (2) which has at least one air intake region (3) for sucking air into the housing (2) and at least one air blow-out region (4) for blowing the air out of the housing (2), a cleaned blow-out air stream (32) being directed towards the body, and in particular against the face of a user, the housing (2) of the air cleaning device (1) being of approximately disc-shaped round or oval or polygonal design, and in that the air intake region (3) and the air outlet region (4) are arranged in the same plane (39) on the circumference of the housing (2).

Claims

1. Personalized air cleaning device (1) with a housing (2) which has at least one air intake region (3) for sucking air into the housing (2) and at least one air blow-out region (4) for blowing the air out of the housing (2), wherein a cleaned blow-out air stream (32) can be directed against the body, and in particular against the face, of a user, the housing (2) being held rotatably and lockably on a fastening (26, 35, 36, 60) about a central axis (50), characterized in that the housing (2, 2a, 2b, 2c) of the air purification device (1, 1a) is approximately disc-shaped in the form of a round or oval or polygonal disc, and in that the air intake region (3) and the air outlet region (4) are arranged in the same radial plane (39) on the circumference of the housing (2).

2. Personalized air cleaning device (1) according to claim 1, characterized in that the air intake region (3) and/or the air outlet region (4), viewed from the fan rotation axis (5), are arranged on the radially outer edge (17) of the housing (2).

3. Personalized air cleaning device according to claim 1, characterized in that the air intake region (3) and the air outlet region (4) are arranged in the region of a circumferential annular groove (40) arranged in the central region of the housing (2, 2a, 2b, 2c) on the outer circumference.

4. Personalized air cleaning device (1) according to claim 1, characterized in that the air intake region (3) and the air blow-out region (4), viewed from the fan rotation axis (5), are arranged in mutually different regions of one or respectively the radially outer edge (17) of the housing (2, 2a-c), respectively.

5. Personalized air cleaning device (1) according to claim 1, characterized in that the housing (2, 2a-c) has a sequence of blades (18, 19) in the air intake region (3) and/or in the air blow-out region (4), air being able to be sucked into the housing (2) between the blades (18) in the air intake region (3) and air being able to be blown out of the housing (2) between the blades (19) in the air blow-out region (4).

6. Personalized air cleaning device according to claim 1, characterized in that in the housing (2, 2a-c) at least one fan wheel (6) of the air cleaning device (1) rotatable around a fan rotation axis (5) and at least one air intake filter (7) of the air cleaning device (1) are arranged to filter the air sucked in by the air intake region (3) and whereby the fan wheel (6) sucks in the air in at least one direction (8) parallel to the fan rotation axis (5) into the fan wheel (6) when in operation and blows it away from the fan wheel (6) in at least one direction (9) radial to the fan rotation axis (5).

7. Personalized air cleaning device according to claim 6, characterized in that the fan wheel (6) is arranged in an interior space (10) partially surrounded by the intake air filter (7).

8. Personalized air cleaning device (1) according to claim 5, characterized in that, seen in a plan view from direction (8) parallel to the fan rotation axis (5), the intake air filter (7, 7a-c) only partially surrounds the interior space (10) in which the fan wheel (6) is arranged and is C-shaped.

9. Personalized air cleaning device (1) according to claim 5, characterized in that, seen in plan view from direction (8) parallel to the fan rotation axis (5), in the section remaining free of the intake air filter (7, 7a-c) there is arranged a blow-out space (11) into which the fan wheel (6) in operation blows the air on the way to the air blow-out region (4) of the housing (2).

10. Personalized air cleaning device (1) according to claim 5, characterized in that the C-shaped intake air filter (7) consists of several segment-shaped filter parts (7a, 7b, 7c).

11. Personalized air cleaning device (1) according to claim 5, characterized in that an air stream (24) of the air sucked in by the fan wheel (6) passes through the air intake region (3) into the housing (2, 2a-c) relative to the fan rotation axis (5) in the radial direction (9) into the intake air filter (7, 7a-c) and then at least as well in directions (8) parallel to the fan rotation axis (5) around a barrier wall (14) to the fan wheel (6).

12. Personalized air cleaning device (1) according to claim 5, characterized in that the barrier wall (14) partially encloses a receiving space (16) for the fan wheel (6) and the fan wheel (6) is arranged eccentrically in the receiving space (16).

13. Personalized air cleaning device (1) according to claim 1, characterized in that the housing (2, 2a-c) has a circular or oval or polygonal outer contour in a view from direction (8) parallel to the fan rotation axis (5).

14. Personalized air cleaning device (1) according to claim 1, characterized in that the housing (2, 2a, 2b, 2c) is designed optionally as a tabletop unit, as a wall unit or as a floor unit.

15. Personalized air cleaning device (1) according to claim 1, characterized in that the air cleaning device (1) is designed as a room air cleaner (1a) and/or as a tabletop appliance, in which the arrangement of the fan (6, 21, 23) takes place wholly or partly within one or more surrounding filters (7), and in that the air intake region (3) and the air outlet region (4) are arranged on the same circumferential plane.

16. Personalized air cleaning device (1) according to claim 1, characterized in that the air cleaning device additionally comprises a heating element and/or a cooling element and/or an air humidifying element.

Description

[0057] Further characteristics and details of preferred variants of the invention are explained below using examples of how the invention is executed.

[0058] As shown:

[0059] FIG. 1: a perspective view of the air cleaning device

[0060] FIG. 2: a rotated representation according to FIG. 1

[0061] FIG. 3: a schematic representation of an application

[0062] FIG. 4: a perspective representation with further details

[0063] FIG. 5: a section according to the line X-X in FIG. 4

[0064] FIG. 6: a perspective compilation drawing

[0065] FIG. 7: another perspective representation

[0066] FIG. 8: a frontal view of the air outlet side with a first version of a table stand

[0067] FIG. 9: a frontal view of the air outlet side with a second version of a table stand

[0068] FIG. 10: the representation according to FIGS. 8 and 9 without stand

[0069] FIG. 11: a side view

[0070] FIG. 12: a frontal view of the intake side

[0071] FIG. 13: a first cross section of the device

[0072] FIG. 14: a second cross section through the device

[0073] FIG. 15: a first longitudinal section through the device

[0074] FIG. 16: a second longitudinal section through the device

[0075] FIG. 17: a third longitudinal section through the device

[0076] FIG. 18: a third cross section of the device

[0077] FIG. 19: a perspective representation of the used filter

[0078] FIG. 20: a version of the air cleaning device in oval disc shape

[0079] FIG. 21: one version of the air cleaning device in square disc shape

[0080] FIG. 22: a version of the air cleaning device in polygonal disc shape

[0081] FIG. 23: another version of an air cleaning device as a large device in side view when installed on a floor

[0082] FIG. 24: the frontal view of the device according to FIG. 23

[0083] FIG. 25: top view of the device according to FIGS. 23 and 24

[0084] FIG. 26: the perspective view of the device according to FIGS. 23-25

[0085] FIG. 27: schematizes the device according to FIGS. 23 to 26 with representation of the segmented intake air filters during a filter change

[0086] FIG. 28: the frontal view of FIG. 27

[0087] FIG. 29: the top view of FIG. 28

[0088] FIG. 30: the perspective view of the device according to FIGS. 27 to 29

[0089] FIGS. 31 to 34: the same illustrations as in FIGS. 27 to 30 when the air cleaning device is designed as a tabletop unit for a filter change

[0090] FIGS. 31A to 34A: the same illustrations as in FIGS. 27 to 30 when the air cleaning device is designed as a tabletop unit after installation of the intake air filters in the operating position

[0091] FIGS. 35 to 38: the same illustrations as in FIGS. 27 to 30 for the design of the air cleaning device with attachment to a mounting surface, e.g. a wall, for a filter change

[0092] FIGS. 35A to 38A: same illustration as in FIGS. 35 to 38 after installation of the intake air filters in operating position

[0093] FIGS. 39 to 40: the air cleaning device in operating position in conjunction with a horizontal deflecting surface

[0094] FIG. 1 shows a perspective side view of the inventive air cleaning device 1 in the form of a rotationally symmetrical circular cylindrical housing 2, which has two mutually symmetrical half-shells 20, which form a central annular groove 40 between them in the central region, wherein preferably the annular groove 40 is arranged recessedly circumferentially in the housing, as can be seen for example in FIGS. 8 and 9.

[0095] A number of blades 18, 19 (see FIG. 13) are arranged in the area of this recessed central annular groove 40 in accordance with FIGS. 4 to 10, with the blades 18 being assigned to the air intake area 3 and the blades 19 to the air outlet area 4.

[0096] According to FIGS. 1 and 2, an outlet nozzle 30 can now be attached to the air outlet area 4, which has an approximately trumpet-shaped shape and an outlet grille 31 in its front area, which generates a laminar air flow via the outlet flow 32 (see FIG. 3).

[0097] A preferably laminar exhaust air flow 32 flows out of the outlet grille 31 of the outlet nozzle 30, which can be directed in arrow direction 37, e.g. against the head area 33 of a user 49.

[0098] It is particularly preferred if the blow-out air flow 32 is directed directly into the breathing area of the user 49, so that the user 49 receives predominantly cleaned blow-out air from the blow-out nozzle 30, which has been cleaned from toxins, foreign odors, plant and grass pollen and the like.

[0099] FIG. 3 also shows that the air cleaning device is disc-shaped in the manner of a discus disc, as it is used in athletics, for example, as a throwing disc. The proportions of FIGS. 1 to 3 also correspond to those of a discus.

[0100] This makes it possible for the first time to rotate such an air cleaning device 1 as shown in FIG. 3 on a stand 26 in the arrow directions 48 in order to achieve free rotation about the axis of rotation 50 of the housing 2, whereby in the region of this axis of rotation 50 the plug opening 34 for a power connection is also arranged at the same time, the power cable of which engages rotatably in the connection socket 28 on the device side.

[0101] FIGS. 4 and 5 show further details of the device after FIGS. 1 to 3, and it is clearly visible that with a rotationally symmetrical housing 2 as shown in FIG. 4, the air intake area 3 extends approximately C-shaped around the outer circumference of the housing 2 and therefore a C-shaped intake air filter 7 (see FIG. 7 and FIG. 14) adapted to it can be arranged in this large area, so that a high volume flow can be filtered through an intake air filter 7 with a large filter surface.

[0102] If, on the other hand, the air was sucked in in the axial direction of the fan rotation axis, i.e. in the area of one of the cover surfaces of the disc-shaped housing, it would not be possible to arrange a large-area air filter in this area without significantly increasing the overall width of the unit.

[0103] Thus, the inventive merit of the invention lies in the fact that the air intake area is placed in the circumferential area on the outer circumference of the device in order to be able to arrange directly behind it in the housing a large-area intake air filter 7, preferably designed as a pleated filter, which sucks in the intake air over a wide circumferential area and generates an air flow in the housing which tapers towards the fan wheel 6.

[0104] While the air intake area 3 extends around a circumferential angle of e.g. 270 around the housing 2, the angle of the air outlet area 4 is only an angle of e.g. 90.

[0105] FIG. 5 shows further details of the arrangement, whereby it is important that both the air intake area 3 on the outer circumference of the housing 2 is located in the area of the aforementioned radial annular groove 40, and the air outlet area 4.

[0106] Because the two areas 3 and 4 are located in the same horizontal plane 39 of housing 2, the width 47 of housing 2 is particularly small, which corresponds to a small disc thickness of the rotationally symmetrical housing 2.

[0107] FIG. 6 shows the principle structure of housing 2, where it can be seen that the two half-shells 20, which are essentially of the same design, accommodate between them an air guide housing 38, in the central interior of which the fan wheel 6 is accommodated, which is driven in rotation about the fan rotation axis 5.

[0108] FIG. 6 also shows the C-shaped intake air filter 7, which forms the C-shaped clean air area 51 on its inside, which forms a radially inwardly directed clean air flow in the direction of the air supply area 51 of the air duct housing 38. The C-shape thus forms a particularly large clean air flow 53 on the radial inside of the intake air filter 7, which is compressed radially inwards onto the fan wheel 6.

[0109] In the same plane 39 of the intake air filter 7, the air outlet area 4 of the air guide housing 38 is also arranged, so that the mentioned parts are arranged in the same plane 39.

[0110] FIGS. 7 to 10 show further details of the construction of case 2 with the air-guiding elements.

[0111] In the view from direction 8 parallel to the fan rotation axis 5 according to FIG. 11, the housing 2 has a circular outer contour. If you look at the side view of the air cleaning device 1 from an orthogonal direction according to FIG. 12, you can see that in this example the housing 2 has a disc-shaped outer contour. The air intake area 3 and/or the air outlet area 4 are arranged on the radially outer edge 17 of the housing 2. Together they form a circumferential area around the housing 2 with openings for the air inlet and outlet into and out of the housing. This can be seen in the design example shown by the blades 18 and 19 which are located in the air intake area 3 and in the air outlet area 4, as can be seen in particular in the cut along the cut line AA from FIG. 12 in FIG. 13.

[0112] There you can also clearly see that the air intake area 3 and the air outlet area 4 are arranged in different areas of the radially outer edge 17 of the housing 2 as seen from the fan rotation axis 5. FIG. 12 shows clearly that between the half-shells 20 of the housing 2 at edge 17 there are the blades 18 and 19 and thus also the air intake area 3 and the air discharge area 4.

[0113] FIG. 12 also shows the two parallel boundary planes 13. Both the air intake area 3 and the air discharge area 4 of this design example are limited by these parallel boundary planes 13. The air outlet space 11 mentioned below, into which the fan wheel 6 blows the air during operation on its way to the air outlet area 4 of the housing, is also located between these two parallel boundary planes 13. The two imaginary boundary planes 13 are arranged normal or orthogonal to direction 8 and thus also to the longitudinal course of the fan rotation axis 5.

[0114] In the cut along the cut line AA from FIG. 12, as shown in FIG. 13, it can be clearly seen that the fan wheel 6 is arranged in accordance with the invention in an interior space 10 at least partially surrounded by the intake air filter 7.

[0115] Here it is intended that in the plan view shown in FIG. 13 from direction 8 parallel to the fan rotation axis 5, the intake air filter 7 only incompletely surrounds the interior space 10 in which the fan wheel 6 is arranged.

[0116] In the section which remains free of the intake air filter 7, the blow-out space 11 is arranged into which the fan wheel 6 in operation blows the air on its way to the air blow-out area 4 of the housing 2. In the first execution example, as can be seen particularly well in FIG. 13, an exhaust air filter 12 is arranged in the outlet space 11. The intake air filter 7 of this design example is C-shaped. The barrier wall 14 is located between the intake air filter 7 and the fan wheel 6. This deflects the air sucked through the intake air filter 7 on its way to the fan wheel 6, as this is shown in detail below using FIGS. 15 and 16.

[0117] FIG. 13 shows the directions 9 radial to the fan rotation axis 5. In these directions 9 the air to be cleaned in the air intake area 3 is sucked in by means of the fan wheel 6 rotating around its fan rotation axis 5. The air sucked in penetrates the spaces between the blades 18 of the housing 2 in the air intake area 3 and then flows in radial direction 9 into the intake air filter 7. The barrier wall 14 then deflects the air thus sucked in on the way from the intake air filter 7 to the fan wheel 6. The air is then sucked into the fan wheel 6 in direction 8 parallel to the fan rotation axis 5 and blown out radially outwards in direction 9 from the fan wheel 6 through an opening 15 in the barrier wall 14 into the discharge chamber 11. In this design, the air then leaves the outlet space 11 through the outlet air filter 12 and through the fins 19 of the air outlet area 4.

[0118] FIG. 13 also clearly shows that in this design example both the blades 18 and the blades 19 are arranged at an angle to the radial direction 9.

[0119] The barrier wall 14 partially encloses the mounting space 16 in which the fan wheel 6 is located. FIG. 13 clearly shows that the fan wheel 6 is arranged eccentrically in this receiving space 16. It is thus located on one side, namely in FIG. 13 (lower left), closer to the barrier wall 14 than on the opposite side, in FIG. 13 (upper left).

[0120] In order to generate the mentioned air flow, the fan wheel 6 rotates around its fan rotation axis 5. For this purpose it is rotated by the fan motor 23 shown in FIGS. 15 and 16. The direction of rotation 29 of fan wheel 6 in operation is shown in FIG. 13.

[0121] In the example shown, the fan wheel 6 or the fan is a so-called backward curved radial fan. This can also be seen from the shape of the air vanes 21. These are arranged on a base 22 of the fan wheel 6 and extend in a direction 8 parallel to the fan rotation axis 5. In a variant not shown in the drawing, the fan can also be designed as a forward curved radial fan.

[0122] A wide variety of filters can be used as intake air filters 7. For example, paper filters, especially folded paper filters, can be used to filter dust or particles out of the air. However, they may also be other porous materials with a corresponding air cleaning effect. The same applies to any blow-out air filter 12. Both filter types may also have activated carbon or similar to remove germs and the like.

[0123] FIG. 14 shows a section in the section plane BB according to FIG. 12. This section plane BB runs parallel to the section plane AA in an area in which neither the barrier wall 14 nor the air vanes 21 of the fan wheel 6 are located, i.e. in the area in which the air sucked through the intake air filter 7 can pass through the barrier wall 14. The exhaust air filter 12 present in this design example is also no longer present in this section plane BB.

[0124] FIG. 15 shows a section through the air cleaning device 1 of this first design example, in the sectional plane CC drawn in FIG. 13. This runs parallel to the fan rotation axis 5 and cuts the intake air filter 7 twice.

[0125] FIG. 16 shows a section through this air cleaning device 1 in the section plane DD also drawn in FIG. 13. The cutting plane DD also runs parallel to the fan rotation axis 5. However, it is arranged orthogonally to the cutting plane CC and cuts on the one hand the air intake area 3 with the intake air filter 7, and on the other hand also the air discharge area 4 and the exhaust air filter 12 arranged here in this design example.

[0126] FIGS. 15 and 16 show the air flow in housing 2 particularly clearly. The air flow 24 is schematized in the form of arrows in FIGS. 15 and 6. In FIGS. 15 and 16 the arrows symbolizing the air flow 24 clearly show that the air is sucked into the intake air filter 7 from outside in the air intake area 3 in radial direction 9 towards the fan rotation axis 5.

[0127] By means of the barrier wall 14, the air flow 24 of the sucked-in air is then deflected inside the housing 2 with movement components also in directions 8 parallel to the fan rotation axis 5. As soon as the sucked-in air has passed the barrier wall 14, it is then sucked into the fan wheel 6 in direction 8 parallel to the fan rotation axis 5. The fan wheel 6 rotating by means of the fan motor 23 in rotation direction 29 then pushes the air with its air vanes 21 through the opening 15 in the barrier wall 14 in direction 9 radially outwards into the discharge chamber 11. In this is located, as shown in FIG. 16 below, in this example the exhaust air filter 12. The air from fan wheel 6 is blown through this filter in radial direction 9 outwards, i.e. away from fan rotation axis 5, so that it leaves housing 2 through the air outlet area 4.

[0128] In short, the air to be cleaned is sucked into the housing 2 in radial directions 9, then directed around the barrier wall 14 in direction 8 parallel to the fan rotation axis 5, and sucked into the fan wheel 6 and from there blown out of the housing 2 as cleaned air in radial directions 9 outwards from the fan rotation axis 5 through the blow-out space 11 and the air blow-out area 4.

[0129] FIGS. 17 and 18 show a second example of the invention in which the exhaust air filter 12 has been dispensed with. Otherwise this second design example corresponds to the first design example, so that reference can be made to the above explanations.

[0130] FIG. 18 shows a cut analogous to FIG. 13. The cut according to FIG. 17 corresponds to the cut according to FIG. 16 of the first execution example. In this second design example according to FIGS. 17 and 18 the air is cleaned exclusively in the intake air filter 7. The outlet space 11 of this design example is empty, so that the air blown out of the housing 2 through the air outlet area 4 is not additionally cleaned in the outlet space 11 by means of an outlet air filter 12. In the area of this blow-out air filter 12 an additional scenting device can be arranged.

[0131] FIG. 7 shows the fan wheel 6 with its fan rotation axis 5 and the intake air filter 7 of the first two design examples without the other components of the air cleaning device 1. Here it is particularly easy to see how the fan wheel 6 is arranged in the interior 10 partially surrounded by the intake air filter 7.

[0132] FIGS. 8 to 10 show various variants of how the air cleaning device 1 can be set up or held during operation. In FIG. 8 a stand 26 is attached to the side of one of the half-shells 20 of the housing 2. A power connection for the fan motor 23 can also be integrated into this stand 26.

[0133] FIG. 9 shows a variant in which the housing 2 of the air cleaning device 1 is placed in a corresponding stand 26. A separate power cable 27 is plugged into the housing 2 to supply power to the fan motor 23. In FIG. 10 an adapter arm 28 is attached to the side of one of the half-shells 20. This can be attached to a wide variety of supports with any number of brackets. In all design examples it is advantageous to have detachable connections between the feet 26 or the adapter arm 28 and the housing 2.

[0134] In FIGS. 8 and 9, an additional shaping element 25 is detachably attached to each air outlet area 4, with which the cleaned air blown out by the air outlet area 4 can be more effectively concentrated on a specific area. This is particularly useful when the air cleaning device 1 is used as a breathing air cleaner to direct purified air into the breathing area of a person.

[0135] This shaping element 25 is designed as a curved air outlet 30 adapted to the outer circumference of the housing 2. The discharge end is formed by a number of curved blades which direct a laminar discharge air flow 32 into the breathing area of the user 49 (see FIG. 3). The blow-out air flow 32 is low in turbulence and is therefore not perceived or hardly perceived by the user 49. It is therefore additionally provided that one or more colored LEDs are arranged in the air outlet area 4 and/or on the outlet nozzle 30, which visually indicate the airflow intensity and/or its composition (scenting, ionization).

[0136] FIG. 19 shows a preferred design of an intake air filter 7 consisting of a pleated filter, in which a number of filter pleats 43 are sealed on a plate-shaped C-shaped ring carrier 42 and the upper side of the filter pleats are fixed by a retaining ring 45 connecting all the filter pleats on the inside.

[0137] A particular advantage is that the intake air filter 7 is designed as a pleated filter and the filter pleats 43 open outwards conically at a cone angle of 44.

[0138] This provides a particularly large filter area for the air flowing in arrow direction 9 and any foreign bodies automatically fall down due to the cone angle 44 and do not block the intake air filter 7.

[0139] Instead of a C-shaped intake air filter 7, other intake air filters can also be used, in particular intake air filters, which are interrupted over their curved length. They then do not form a continuous C-shaped body, but are sectorally composed of individual curved elements, which together form a C-shaped intake air filter 7.

[0140] FIGS. 20 to 22 show schematized housing shapes 2a, 2b, 2c that differ from the housing shape of the housing 2.

[0141] FIG. 20 shows that the rotationally symmetrical housing 2 can also be designed as an oval housing 2a according to FIGS. 1 to 3, which is mounted on a suitable stand, bracket or the like so that it can rotate about the horizontal axis of rotation 50 in the arrow directions 48.

[0142] In deviation from this, FIG. 21 shows that the case 2b can also be square and FIG. 22 shows that the case 2c can also have a polygonal cross section.

[0143] All designs have in common that the housing 2, 2a-2c is approximately disc-shaped, i.e. the construction width 47 has a ratio to the diameter of the device in the range between 1:2 and 1:10.

[0144] Likewise, FIG. 3 shows the connection with FIGS. 20 to 22, that such a housing 2, 2a-2c can be set up with a suitable stand 26 on the setting-up surface 35 of a table 36. It can also be mounted on a building wall with a wall bracket so that it can rotate about the axis of rotation 50 or it can also be mounted in a motor vehicle with a suitable bracket.

[0145] The following description of the invention refers to an air purifier 1a as a large appliance according to FIGS. 23 to 40, which has the same characteristics and advantages as described above for an air purifier as a table appliance: [0146] 1 The basic principle of the arrangement of the fan 6, 23 wholly or partly within one or more surrounding filters 7a, 7b, 7c, optionally with air inlet 3 and air outlet 4 arranged on the same circumferential level, is not only advantageous and novel for a personalized air cleaning device for the table, but also for a room air purifier, which can stand on the floor and can reach up to 100 cm in diameter and do without air outlet 30. [0147] 2 In the case of a room air purifier 1a, the arrangement of the fan 6, 23 within a circulating filter 7a-c on the same level also results in a particularly flat disc, which is advantageous in many living and working rooms. Thus a flat room air cleaning unit 1a is particularly suitable for being placed against a wall or hung on a wall. The flat construction depth thus requires less active living or working space than alternative concepts. [0148] 3 For a room air purifier 1a, the circumferential air inlet 3 and air outlet 4 allow the front and rear half-shells 20 to remain free of optical or functional impairment by air inlets or air outlets and can be used for functions such as attachment to a floor stand or a wall suspension. In addition, visible surfaces without air inlets and outlets are particularly attractive, do not get dirty so quickly and can also be used for design measures (printing pictures, and so on). [0149] 4 The special design of the filter according to FIG. 19 applies both to a tabletop unit and to a wall or floor unit. This special design of the filter as a pleated filter with pleats parallel to the axis of rotation of the fan and completely or partially overlapping with the fan has the advantage of achieving a maximum filter surface with the smallest space requirement.

[0150] FIGS. 23 to 24 show an invented air cleaning device with all the features described above, but in the form of a large device, so that such an air cleaning device is no longer assigned to a single person but serves as a room air purifier.

[0151] However, this does not preclude the use of such a room air purifier 1a as a personalized air cleaning device. For this reason, the characteristics described above for air purifier 1 also apply in a similar way to the indoor air purifier shown in FIGS. 23 to 40.

[0152] A difference between the air cleaning device 1 and the room air purifier 1a according to FIGS. 23 to 40 is that the housing 2 also consists of two half-shells 20, which complement each other to form a closed housing, whereby the housing 2, 2a, 2b, 2c can no longer be rotated through 360, but only through a rotation range 56 of e.g. 270.

[0153] This is because the power supply is no longer provided in the area of the rotation axis (connection socket 28 in FIG. 1), but that a power cable 57 with a connection plug 58 is inserted into a cable supply 59 in one half-shell 20, which is outside the rotation axis 50. This is shown in FIGS. 24 and 26.

[0154] Due to the design of the room air purifier 1a with a preferred housing diameter of a housing 2, 2a, 2b, 2c of 60 cm, it is necessary to subdivide the intake air filter 7 into e.g. preferably three intake air filter elements, which is a one-piece c-shaped intake air filter 7.

[0155] This is shown in FIGS. 24 to 26. The intake air filter 7 thus consists of the individual, circular ring-shaped intake air filter elements 7a, 7b, 7c, which also join together to form a C intake air filter.

[0156] They therefore also extend, for example, by an angle range of 270 on the housing and form an air outlet area 4 in between.

[0157] In the example shown after FIGS. 23 to 26, the air purifier 1a is rotatably mounted on a stand 26, which is set up on a floor, for example.

[0158] In order to achieve a favorable operation, it is provided after a further characteristic that the operating elements 54 and the display elements 55 are arranged in the edge area 62 of a half-shell 20, so that they are not disturbing design-wise, are well operable and require only a small operating surface.

[0159] Thus the circumferential surfaces of the drum-shaped or disc-shaped housing 2, 2a, 2b, 2c are fully used for the air outlet area 4 and the filter surfaces of the intake air filters 7a, 7b, 7c.

[0160] FIGS. 27 to 30 show an advantageous execution according to the previously described execution according to FIGS. 23 to 26, whereby a filter change is shown.

[0161] To change a filter, e.g. the intake air filter element 7b, the housing is rotated around its axis of rotation 50 until the filter element 7b reaches the topas shown in FIG. 27and can now be easily removed from the housing, as shown in FIGS. 28 to 30.

[0162] To replace the other intake air filter elements 7a and 7c, turn the housing 2, 2a, 2b, 2c further so that the respective intake air filter element 7a, 7b or 7c to be replaced replaces the intake air filter element 7b.

[0163] This results in particularly easy operation and good accessibility of the various intake air filter elements 7a-7c.

[0164] Instead of such a unit being designed as a floor unit, such a room air purifier 1a can also be provided as a table unit, which is set up with a stand 26 on the installation surface 35 of a table 36.

[0165] Otherwise, the same explanations apply with regard to filter replacement and the composition of the indoor air purifier 1a according to the above drawings FIGS. 23 to 30.

[0166] FIGS. 31A to 34A show the same unit as FIGS. 31 to 34, whereby the intake air filter elements 7a-7c are now inserted into housing 2 ready for operation and the unit is in its operating position according to FIG. 34A with the air outlet range 4 pointing upwards.

[0167] The unit can be rotated freely around its axis of rotation 50 and e.g. a rotation angle of 270, whereby the air outlet area 4 can be rotated within these wide limits.

[0168] It can also be seen from the illustration in FIGS. 23 to 34A inclusive that even an extreme operating condition is possible because the air cleaning device 1 and/or the room air purifier 1a can also be operated lying down, which does not impair the functioning of the appliance. In this case the unit 1, 1a with a half-shell 20 would lie on the floor or on a table surface and the air outlet area 4 would be directed in a horizontal direction.

[0169] Such a mode of operation is also possible. Such a mode of operation is not possible for the devices that were recognized as state of the art in the introduction to the description. Accordingly, FIGS. 35 to 38 show that such a room air purifier 1a can be attached to a vertical mounting surface 60, e.g. a wall surface. FIGS. 35 to 38 show the possibility of changing the filters of the intake air filter elements 7a, 7b and 7c in the same way as described above.

[0170] Therefore, instead of a vertical mounting surface 60, a horizontal mounting surface 60 can also be used, whereby the room air purifier 1a is operated horizontally.

[0171] A special advantage of the window shape, both with the air cleaning device 1 and with the room air cleaner 1a, is that the front surface of the half-shell 20 is completely free of fixtures and can therefore be used well as an advertising surface, which carries e.g. an imprint or sticker or other design elements.

[0172] FIG. 35A up to and including FIG. 38A show the operational condition of the unit as shown in FIGS. 35 to 38, if the intake air filter elements 7a, 7b, 7b are installed at their place of attachment in the housing. FIGS. 39 and 40 show such a room air purifier 1a in an installation position below a deflection surface 61, which can be e.g. a shelf or a ceiling or the like. From this it becomes clear that such a room air cleaner 1a can also be installed high under a room ceiling and nevertheless a favorable access to the intake air filter elements 7a-7c is possible, because the equipment can be turned if necessary always in such a way that the intake air filter element 7a-7c which can be replaced in each case comes into the grasping range of a user.

REFERENCE NUMERALS

[0173] 1 Air purifying device [0174] 1a Room air cleaner [0175] 2 Housing 2a, 2b, 2c [0176] 3 Air intake area [0177] 4 Air outlet area [0178] 5 Fan rotation axis [0179] 6 Fan wheel [0180] 7 Intake air filter 7a, 7b, 7c [0181] 8 Direction [0182] 9 Direction [0183] 10 Interior [0184] 11 Air outlet space [0185] 12 Blow-out filter [0186] 13 Limiting level [0187] Barrier wall [0188] 15 Opening [0189] 16 Recording room [0190] 17 Outer edge [0191] 18 Blade [0192] 19 Blade [0193] 20 Half-shell [0194] 21 Air shovel [0195] 22 Base area [0196] 23 Fan motor [0197] 24 Air flow [0198] 25 Shaping element [0199] 26 Stand [0200] 27 Power cable [0201] 28 Adapter arm [0202] 28 Connection socket [0203] 29 Direction of rotation [0204] 30 Outlet nozzle [0205] 31 Air outlet grille [0206] 32 Outlet air flow [0207] 33 Head area [0208] 34 Plug opening [0209] 35 Installation area [0210] 36 Table [0211] 37 Direction of arrow [0212] 38 Air guide housing [0213] 39 Level [0214] 40 Ring groove [0215] 41 Inside [0216] 42 Ring carrier [0217] 43 Filter pleat [0218] 44 Cone angle [0219] 45 Retaining ring [0220] 46 [0221] 47 Construction width [0222] 48 Direction of arrow [0223] 49 Users [0224] 50 Center axis (rotary axis) [0225] 51 Clean air area [0226] 52 Air supply area [0227] 53 Clean air flow [0228] 54 Operating elements [0229] 55 Display elements [0230] 56 Turning range [0231] 57 Power cable [0232] 58 Connector plug [0233] 59 Cable entry [0234] 60 Mounting surface [0235] 61 Deflection surface