DE29816382U1 - Air purifier - Google Patents

Description

EWA Lufttechnik GmbH, Schneeglöckchenstr. 80a, 80995 Munich

Air purifier

The invention relates to an air purification device for vacuuming dirt and the like. according to the preamble of claim 1.

Such air purification devices are mainly found at petrol stations, car washes, etc. and are usually referred to as self-service vacuum cleaners.

The suction hose of such an air purifier must be relatively long so that all areas of an object to be cleaned, such as a motor vehicle, can be reached from the location of the immobile air purifier. However, this great length leads to a storage problem when the suction hose is not in use. If the suction hose is simply laid on the floor, there is a risk that the following customer will drive over the suction hose with their vehicle and thus damage it.

In order to avoid this, it is already known in practice to equip the air purifiers with retraction devices for the suction hose, which pull the suction hose into an inoperative position in which it does not rest on the floor.

However, air purifiers are often installed outdoors and are therefore exposed to the effects of the weather, in particular rain, snow and dust stirred up by the wind. The suction hose can therefore become wet and/or dirty, which can in turn soil the user's clothing or the vehicle when used. This problem is particularly acute with air purifiers which, like most devices in use today, use a suction hose which has radial stiffening ribs on its outside at close intervals. Moisture, dust, etc. can then collect in the spaces between the stiffening ribs, which can get onto the clothing and/or the object to be cleaned when a user picks up the suction hose.

It is the object of the present invention to provide an air purification device of the type mentioned at the outset which, while providing good suction power, avoids contamination of the user and/or the object to be vacuumed.

The above object is initially solved by the features of claim 1. Advantageous embodiments can be found in subclaims 2 to 24.

By storing at least half the length of the suction hose in the hose chamber when not in use, the suction hose is reliably prevented from becoming dirty due to weather influences. In particular, with suction hoses with ribs on their outside, no dirt and/or moisture can collect in the spaces between the ribs, which could soil either the user's clothing or the object being cleaned when the suction hose is used. The hose chamber itself is designed in such a way that it is closed on all sides except for an outlet opening for the suction hose. However, door openings can be provided in this completely closed hose chamber for repair and/or maintenance purposes.

It is preferred that when the suction hose is not in use, at least 2/3 of the hose length is accommodated in the hose chamber.

In order to keep the volume of the hose chamber and thus its manufacturing costs small, it is advantageous if the suction hose is accommodated in the hose chamber in an S-curve shape when not in use. This can be done, for example, by guiding the movement of the suction hose in the hose chamber using at least one guide element, preferably a guide roller. The S-curve-shaped suction hose lies in a plane that runs at least approximately vertically. Depending on the material of the suction hose, it can also be accommodated in the hose chamber in a loop-like back and forth manner in the vertical plane. It should also be noted in this context that the suction hose can of course also be arranged in a horizontal plane or in such a way that the suction hose forms a helical pyramid in the hose chamber.

In order to ensure that the suction hose is accommodated in the hose chamber when not in use, it has also proven advantageous if the suction hose can be retracted into its inoperative position by means of a retraction device. The retraction device can be designed by any possible device, such as a running weight, one or more springs, etc.

In principle, it is possible for the reset device to be arranged outside the hose chamber, whereby, for example, the reset device engages the suction hose at the front end, i.e. in the area of the suction nozzle. However, in order to protect the reset device from the effects of the weather, it has proven advantageous if it is arranged inside the hose chamber.

The hose chamber can basically have any shape. A space-saving solution is for the hose chamber to have the shape of an upright cuboid, at the top of which there is an outlet opening for the suction hose. As already explained, this cuboid can have one or more maintenance doors for maintenance purposes. The maintenance doors can also be formed by simple, removable panels of the chamber cladding.

In its non-operating position, the section of the suction hose that is not inside the hose chamber can be located on the outside of the

Hose chamber. In the case of a cuboid-shaped hose chamber, this can be one of the narrower long sides of the cuboid, for example. In order to protect the suction hose against damage here too, it has also proven to be advantageous if there is a recess on the outside of the hose chamber for the section of the suction hose that is still outside the hose chamber when not in use. A locking device can be provided here that releasably locks the suction hose in its non-operating position when not in use. The locking device can be formed by a door.

In order to ensure that the suction hose is always returned to its inoperative position, regardless of whether a reset device for returning the suction hose to its inoperative position is present or whether this is functional, it can also be provided that the locking device can be released using a deposit coin, which is issued again after the suction process has ended, the suction hose has been returned and the locking device has been locked. This forces the user to return the suction hose to its inoperative position, regardless of whether a reset device is functioning.

In the air cleaning devices known from practice, the filter has a cylindrical shape and is arranged in the housing of the suction device in such a way that its cylinder axis runs essentially vertically. The suction air enters via a suction air connection on the cylinder surface approximately in the area of the upper third of the upright filter cylinder and exits the filter at its upper end via the exhaust air connection. The dirt transported into the filter via the suction air should sink downwards in the filter due to the cyclones that form on its way from the suction connection to the exhaust air connection. The suction connection is therefore also arranged approximately in the upper third of the filter in order to create sufficient space for the dirt to accumulate. In practice, however, it has been shown that the sinking of the dirt only applies to very heavy dirt components, such as stones, grains, etc. Light dirt, such as dust particles, fluff, etc., accumulates on the cylinder wall in the area of the suction air connection and clogs the filter relatively quickly. This reduces the suction power.

Due to the inventive higher arrangement of the intake connection of the

Suction device, in particular the filter device opposite the exhaust air connection of the suction or filter device, the above requirement for good suction power over a long period of time is met. This design leads the suction air flow inside the filter from top to bottom. At the beginning of the usage cycle of a filter, i.e. when the filter is empty, the suction air flows through the entire filter. Due to the dirt accumulating in the filter, this flow path is shortened in the vertical direction of the filter, although a suction flow from top to bottom still exists. This suction flow means that the entrained dirt only accumulates in the filter at the point where the suction air exits the filter. The filter according to the invention therefore remains free of dirt on the side of the suction connection, so that the suction power can be maintained over a long period of time. Only when the dirt deposits approach the suction air connection does the suction power decrease and the filter must be replaced or cleaned.

In this context, it has proven to be advantageous if the filter of the suction device is accommodated in a filter bowl in such a way that a first flow gap for the suction air is present between the inner wall of the filter bowl and the outer wall of the filter. This leads the suction air along a flow path that runs largely vertically downwards from the suction connection inside the filter and largely vertically upwards in the first flow gap between the inner wall of the filter bowl and the outer wall of the filter.

Furthermore, it can be provided that the filter bowl is accommodated in a filter housing which has an intake connection on its top and an exhaust connection on its bottom, whereby the filter bowl can be inserted in such a way that a second flow gap for the suction air is present between the outer wall of the filter bowl and the inner wall of the filter housing. This guides the flow path of the suction air inside the filter from the intake connection largely vertically downwards, in the first flow gap largely vertically upwards and in the second flow gap largely vertically downwards. This has shown in practical tests that the suction power remains consistently high over a long period of use.

In addition, it has proven to be advantageous if the intake connection and the exhaust connection of the filter housing are aligned vertically

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are arranged. In this context, it should be noted that the filter housing can coincide with the housing of the suction device, but can also be arranged separately in the housing of the suction device.

The filter, the filter bowl and the filter housing can be of a wide variety of shapes, and the most suitable for each individual application. In order to be able to use standard filter inserts without any problems, it has proven to be advantageous for the filter, the filter bowl and/or the filter housing to be cylindrical and arranged concentrically to one another. This also creates constant, equal gap widths between the respective inner and outer walls for the first and second flow gaps.

In order to avoid damage to the drive unit for the suction device, it can also be provided that a further filter, in particular a fine particle filter, is arranged in the area of the exhaust air connection.

In order to ensure that the suction air flows exclusively through the filter, it is advantageous if the filter can be arranged tightly in the area of the suction connection. This sealing can be achieved by using a lifting device to press the filter against the wall of a housing for the suction device that has the suction connection. The lifting device has the advantage that the filter can be lowered and, if necessary, swung out of the housing of the suction device in order to replace it. The filter can therefore be emptied easily.

The seal between the intake connection and the filter can be further improved by covering the wall of the housing of the suction device, which has the intake connection, with a sealing material on its side facing the filter, at least in the area of the filter.

The filter itself can be formed by a filter basket with a removable filter bag arranged inside it.

Further advantageous embodiments and an embodiment of the present invention are explained in more detail below. Here:

Figure 1 is a schematic side view of an air purification device according to the invention;

Figure 2 is a front view of the air purifier shown in Figure 1;

Figure 3 is a plan view of the air purification device shown in Figures 1 and 2; and

Figure 4 is a schematic representation of the filter device of the air purification device according to the invention.

Figures 1 to 3 show a schematic representation of an air purification device 10 according to the invention with its most important components. The air purification device 10 has a suction device 40, which is explained in more detail below, and a suction hose 70, which is only shown by a dashed line in all drawing figures.

The air purification device 10 has a housing 12 which comprises a first and a second housing section 14, 16. The housing 12 is formed from a frame (not shown in detail) and cladding elements, preferably cladding sheets, which are attached to it in a detachable or non-detachable manner. If the cladding elements are permanently attached to the frame, the housing 12 may have further openings of this type as maintenance and/or assembly openings in addition to the closable openings described below.

The first housing section 14 serves as a hose chamber into which the suction hose 70 is accommodated when not in use. The hose chamber 14 is, based on the illustration in Figure 2, arranged to the right of the second housing section 16 and has the shape of an upright cuboid. The cuboid-shaped hose chamber 14 is arranged so that it stands with one end face on the floor (not shown in more detail) and with one of its wider long sides faces the second housing section 16. The hose chamber 14 as part of the housing 12 is, as already mentioned, surrounded with cladding elements (not shown in more detail) so that a cavity 14a is present in its interior.

In the cavity 14a, in the area of the upper end 14b of the cuboid-shaped hose chamber 14, four guide rollers 18 are provided, the roller axes of which run essentially horizontally. The four guide rollers 18 are arranged in the manner

arranged so that the centers of their roller axes form the corner points of a trapezoid, the shorter parallel side of which, in relation to Figure 1, lies below the longer parallel side. The suction hose 70 runs, as shown in Figure 1, between the guide rollers 18 in such a way that the two converging side legs of the trapezoid are intersected by it. To guide the suction hose 70 securely, the rollers 18 can be provided with guide grooves on their outer circumferential surface, as shown schematically in Figures 2 and 3.

In order that the suction hose 70 is safely retracted into the hose chamber 14 when not in use, a return device 20 is provided, which can consist, for example, of one or more running weights 20a [?]. In its non-operating position, the suction hose 70 is accommodated in the hose chamber 14 in such a way that a first section 70a of the suction hose 70 is located in the hollow space 14b of the hose chamber 14, which comprises at least half, preferably at least 2/3 of the total length of the suction hose 70. In order to ensure that the hose chamber 14 only takes up a relatively small volume despite the great length of the first hose section 70a, the suction hose 70 runs in an S-shaped arc inside the hose chamber 14 in its non-operating position.

The two end positions of the running weight 20a are shown in Figure 1. In the inoperative position of the suction hose 70, the running weight 20a is located in the area of the lower third of the hose chamber 14. If the suction hose 70 is pulled out completely from the hose chamber 14, the running weight 20a is located in the area of the guide rollers 18, specifically, in relation to Figure 1, next to the right lower guide roller 18. In Figure 1, the running weight 20a in the latter position is only shown with broken lines.

On the broad side of the cuboid hose chamber 14 facing the second housing section 16, an opening 22 is provided above the upper wall 16a of the second housing section 16, through which the suction hose 70 is led out of the cavity 14b of the hose chamber 14 and to the suction device 40 explained in more detail below. The suction hose 70 can be led directly through the opening 22. However, a sleeve (not shown) to which a part of the suction hose 70 is connected on both sides is preferred. In addition to its feed-through function, the sleeve also serves as a strain relief for the suction hose between the sleeve and the

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Suction device 40 present second section 70b of the suction hose 70, when the suction hose 70 is partially or completely pulled out of the hose chamber 14.

On the left narrow longitudinal side 14c of the cuboid-shaped hose chamber 14, in relation to Figure 1, an opening 24 is provided in the area of the upper third of the suction chamber 14, through which the suction hose 70 can be pulled out of the hose chamber 14. In order to avoid damage to the suction hose 70 when pulling it out and returning it, the opening 24 can be sufficiently large and/or provided with hose protectors (not shown) on its edges.

On the same narrow longitudinal side 14c of the hose chamber 14, a recess 26 is also provided, which extends almost completely over the length of this narrow side 14c. The section 70 of the suction hose 70 (= third hose section 70c) that is located outside the hose chamber 14 when the suction hose 70 is not in use, as shown in Figure 1, is arranged in the recess 26. This recess 26 can have a U-shaped or a V-shaped or any other cross-section, based on a horizontal plane, as long as it is ensured that the suction hose 70 arranged therein does not protrude beyond the outer edge of the cuboid-shaped hose chamber 14.

At its lower end, based on Figure 1, the recess 26 merges into a insertion pocket 28. The suction nozzle 72 attached to the free end of the suction hose 70 can be inserted into this insertion pocket 28 when the suction hose 70 is not in use, as can also be seen from Figure 1. This ensures that the pressure-sensitive suction nozzle 72 does not lie on the floor when the suction hose 70 is not in use and can be damaged in the process.

The recess 26 can be open to the outside. It is also possible that the recess 26 can be closed by a door 32 that can be pivoted by approximately 90° via a vertical hinge axis 30, as shown in Figure 3. Figure 3 shows the two end positions of the door 32. The door 32 further protects the suction hose 70, in particular the third hose section 70c, against the effects of the weather and/or damage.

In order to fix the suction hose 70 in the recess 26 when the door 32 is closed, the door 32 is provided on its inner side 32a with two rods 34 which run essentially vertically and at a distance from one another and which also serve to stiffen the door 32. The door 32 can, as can be seen from Figure 1, extend almost over the full vertical length and the full width of the narrow longitudinal side 14c of the hose chamber 14.

In order that the suction hose 70 is always returned to its inoperative position by the user after use, regardless of the presence of a reset device or regardless of its proper function, the door 32 can be operated using a deposit lock 36. The deposit lock 36, which can have a structure similar to that found in shopping carts in grocery stores, is opened by inserting a coin. After the suction hose 70 has been returned to its inoperative position and the door 32 has been closed, the coin is released again.

The suction device 40 of the air cleaning device 10 according to the invention is housed in the second housing section 16, which is also referred to as the suction housing 16. The suction housing 16 also has the shape of an upright cuboid with a square cross-section when viewed in a horizontal plane. Its vertical height is smaller than that of the hose chamber 14. The upper horizontal wall 16a of the suction housing 16 lies below the deposit lock 36, as can be seen from Figures 1 and 2.

The suction housing 16 is also provided with cladding elements in such a way that it has a cavity 16b. The suction device 40 with the filter device F, the suction fan motor M and the control device S is accommodated in the cavity 16b. The suction fan motor M and the control device S are arranged on the bottom 16c of the suction housing. In the area of the suction fan motor M there are openings (not shown) for the outlet of the extracted air.

The filter device F consists, as can be seen in particular from Figure 4, of a cylindrical filter basket 42 that is open at its upper end face 42a (with reference to Figure 4). At least the cylindrical peripheral wall of the filter basket 42 is permeable to flowing air. A filter bag 44 is arranged inside the filter basket 42 with its opening to the open, upper end face 42a of the filter basket 42, which is made of a disposable material, for example

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Paper, or a reusable material. The material of the filter bag 44 allows flowing air and moisture to pass through, but not dust particles and the like. The filter bag 44 is arranged in the filter basket 42 in an interchangeable manner. It is held in the filter basket 42, for example, by its upper edge 44a being placed around the upper edge 42a of the filter basket 42 and the upper edge 42a of the basket 42 being pressed against the inside of the upper wall 16a of the suction housing 16. In addition, it should be noted that it is also possible to insert a disposable insert into the filter bag 44 to collect the dirt that is sucked in.

The filter basket 42 is accommodated inside a filter bowl 46 made of a gas and moisture impermeable material, preferably plastic. The filter bowl 46 also has a cylindrical contour and an open front side 46a, which, however, does not extend to the inside of the upper wall 16a of the suction housing 16, as shown in Figure 4. At its lower end 46b, the filter bowl 46 has a support cone or a shoulder 48 on which the filter basket 42 sits. The shoulder 48 forms a first intermediate space 50 between the outside of the base of the filter basket 42 and the inside of the base of the filter bowl 46, in which the moisture entrained with the intake air and which has passed through the walls of the filter basket 42 and the filter bag 44 can collect. The inner diameter of the filter bowl 46 is larger than the outer diameter of the filter basket 42, so that a first annular flow gap 52 is formed between the filter bowl 46 and the filter basket 42 arranged concentrically to the filter bowl 46.

The filter basket 42 with the filter bag 44 and the filter bowl 46 are also accommodated in a filter housing 54 made of a gas and moisture-impermeable material, preferably plastic. The filter housing 54 in turn has a cylindrical outer contour and an open front side 54a towards the inside of the wall 16a, which, like the open front side 42a, reaches up to the inside of the wall 16a. On the lower front side 54b, the filter housing 54 has an exhaust air connection 56 to which a fourth suction hose section 70d is connected, which connects the filter device F to the suction fan motor M (see Fig. 2).

On the bottom of the filter housing 54, upstream of the exhaust air connection 56, there is a fine particle filter 58 through which the suction air must flow in order to reach the exhaust air connection 56. The filter bowl 46 rests with its bottom 46b on the fine particle filter 58, so that between the outside of the bottom of the

A second intermediate space 60 is formed between the filter bowl 46 and the bottom inside of the filter housing 54, through which the suction air can flow to the exhaust air connection 56.

The inner diameter of the filter housing 54 is dimensioned such that a second annular flow gap 62 is formed between the outer peripheral wall of the filter pot 46, which is inserted concentrically into the filter housing 54, and the inner peripheral wall of the filter housing 54. The flow path of the suction air through the filter device F runs as follows, with particular reference to the flow arrows shown in Figure 4:

First, the suction air enters the filter bag 44 held by the filter basket 42 via a suction connection 16c in the upper wall 16a of the suction housing 16, to which the second suction hose section 70b is connected. There, the suction air, which carries away the extracted dirt particles and possibly moisture, flows to the bottom 42b of the filter basket 42. Heavier dust particles fall downwards and collect on the bottom 42b of the filter basket 42. Finer dust particles, such as fluff, etc., are caught on the inner wall of the filter bag 44 when the suction air passes through the cylinder wall of the filter bag 44 and the filter basket 42 and can then also fall to the bottom or get stuck there. Since, in a newly installed or freshly cleaned filter bag 44, the finer dust particles initially collect in the lower area of the filter bag 44 on the inner peripheral wall of the filter bag 44, the suction air can pass unhindered through the walls of the filter bag 44 and the filter basket 42 in the areas above, based on Figure 4, so that, in contrast to the prior art, the suction power remains unchanged even over a very long period of time. In other words, the filter bag 44 is gradually clogged from bottom to top, but over a long period of time an area of the filter bag 44 that is not yet completely clogged remains for the unhindered passage of the suction air.

The moisture carried along by the suction air also sinks to the bottom 42b of the filter basket 42, but does not collect there, but passes through the bottom 42b of the filter bag 44 and the filter basket 42 or, if necessary, through the lower cylinder wall sections of the bag and the basket 42. It reaches the first gap 50 between the outside of the bottom of the filter basket 42 and the inside of the bottom of the filter bowl 46. Since the filter bowl 46 is made of a moisture-impermeable material, the moisture can then collect in this first gap 50 and from time to time escape through

removing the filter bowl 46 from the suction housing 16.

After the suction air has passed through the cylinder walls of the filter bag 44 and the filter basket 42, the suction air flows upwards in the first flow gap 52, as shown in Figure 4. Since the upper end 46a of the filter bowl 46 does not reach as far as the inside of the upper wall 16a, the suction air flows as exhaust air over this upper end 46a and reaches the second flow gap 62. There, the exhaust air flows downwards and exits the filter device F via the fine particle filter 58 through the exhaust air connection 56.

In order to improve the seal between the upper ends 42a, 44a of the filter basket 42 or the filter bag 44 and the upper end 54a of the filter housing 54a, a flat sealing material 64 can be attached in the area of the inside of the upper wall 16a of the suction housing 16. This can, for example, be glued to the inside of the upper wall 16a.

In order to ensure the seal between the sealing material 64 and the components of the filter device F, the filter device F is pressed against the sealing material 64 by means of a lifting device H, which is only shown schematically in Figure 2. The lifting device H can raise and lower the filter device F in a vertical direction, as shown by the double arrow in Figure 2. The lifting device H not only serves to press the filter device F against the sealing material 64, but also to facilitate emptying or replacing the filter bag 44. To do this, a lockable door 16d arranged on the front of the suction housing 16 is first opened. The filter device F is then lowered by means of the lifting device H. The filter device F can then be pivoted out of the suction housing 16 about a vertically extending pivot axis 66 that interacts with the lifting device H, as shown by broken lines in Figure 3. To empty or replace the filter bag 44 and, if necessary, the filter bowl 46 can be removed from above. To start up, the procedure is reversed.

It should also be noted that the diameter of the suction connection 16c in the upper wall 16a of the suction housing 16 and the diameter of the exhaust air connection 56 are smaller than the diameters of the filter bag 44, the filter basket 42, the filter bowl 46 and the filter housing 54. It should also be noted that the suction connection 16c in the upper wall 16a of the suction housing

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ses 16 and the exhaust air connection 56 are arranged concentrically to each other.

Claims (24)

Expectations 1. Air cleaning device for vacuuming dirt and the like, in particular at petrol stations, car washes, etc., comprising a suction device (60) with at least one filter device (F) which is arranged in the suction device (40) in the flow path of the suction air between a suction connection (16c) and an exhaust air connection (56) of the suction device (40), and a suction hose (70) connected to the suction connection (16c) of the suction device (40), characterized in that the suction hose (70) can be brought into an inoperative position when not in use, in which at least more than half the hose length is accommodated in a hose chamber (14). 2. Air purification device according to claim 1, characterized in that when the suction hose (70) is not in use, at least 2/3 of the hose length is accommodated in the hose chamber (14). 3. Air purification device according to claim 1 or 2, characterized in that the suction hose (70) is accommodated in the hose chamber (14) in an S-curve shape when not in use. 4. Air purification device according to one of claims 1 to 3, characterized in that the movement of the suction hose (70) in the hose chamber (14) can be guided by means of at least one guide element, preferably a guide roller (18). 5. Air purification device according to one of claims 1 to 4, characterized in that the suction hose (70) can be retracted into its inoperative position when not in use by means of a return device (20). 6. Air purification device according to claim 5, characterized in that the resetting device is a running weight (20a). 7. Air purification device according to claim 5 or 6, characterized in that the return device is arranged in the interior of the hose chamber (14). 8. Air purification device according to one of claims 1 to 7, characterized in that the hose chamber (14) has the shape of an upright cuboid, at the upper end (14b) of which an outlet opening (24) for the suction hose (70) is provided. 9. Air purification device according to one of claims 1 to 8, characterized in that on the outside of the hose chamber (14) there is a receiving recess (26) for the section (70c) of the suction hose (70) which is still located outside the hose chamber (14) when not in use. 10. Air purification device according to one of claims 1 to 9, characterized in that the section (70c) of the suction hose (70) located outside the hose chamber (14) when the suction hose (70) is not in use can be releasably secured by a locking device (30, 36). 11. Air purification device according to claim 10, characterized in that the locking device is formed by a door (30). 12. Air purification device according to claim 10 or 1 1, characterized in that the locking device (30, 36) can be released by a deposit coin which can be issued again after completion of the suction process and return of the suction hose (70) and locking of the locking device (30, 36). 13. Air purification device according to the preamble of claim 1, characterized in that the suction connection (16c) of the suction device (40), in particular of the filter device (F), is arranged higher - 17 - as its exhaust air connection (56). 14. Air purification device according to claim 13, characterized in that the filter (42, 44) of the filter device (F) is accommodated in a filter bowl (46) in such a way that a first flow gap (52) for the suction air is present between the inner wall of the filter bowl (46) and the outer wall of the filter (42, 44). 15. Air purification device according to claim 14, characterized in that the flow path of the suction air in the interior of the filter (42, 44) runs from the suction connection (16c) largely vertically downwards and in the first flow gap (52) between the inner wall of the filter bowl (46) and the outer wall of the filter (42, 44) largely vertically upwards. 16. Air purification device according to claim 15, characterized in that the filter pot (46) can be inserted into a filter housing (54) which has an exhaust air connection (56) on its underside (54b), in such a way that a second flow gap (62) for the suction air is present between the outer wall of the filter pot (46) and the inner wall of the filter housing (54). 17. Air purification device according to one of claims 14 to 16, characterized in that the flow path of the suction air in the interior of the filter (42, 44) runs from the suction connection (16c) largely vertically downwards, in the first flow gap (52) largely vertically upwards and in the second flow gap (62) largely vertically downwards. 18. Air purification device according to claim 16 or 17, characterized in that the intake connection (16c) and the exhaust air connection (56) of the filter housing (54) are arranged in vertical alignment with one another. 19. Air purification device according to one of claims 14 to 18, characterized in that the filter (42, 44), the filter bowl (46) and/or the filter housing (54) are arranged cylindrically and concentrically to one another. 20. Air purification device according to one of claims 13 to 19, characterized in that a further filter (58) is provided in the region of the exhaust air connection (56). 21. Air purification device according to one of claims 13 to 20, characterized in that the filter (58) can be arranged in a sealing manner in the region of the intake connection (56). 22. Air purification device according to claim 21, characterized in that the filter device (F) can be pressed in a sealing manner by means of a lifting device (H) against the wall (16a) of a housing (16) for the suction device (10), said wall having the suction connection (16c). 23. Air purification device according to claim 21 or 22, characterized in that the wall (16a) of the suction housing (16) having the suction connection (16c) is covered with a sealing material (64) on its side facing the filter (42, 44) at least in the region of the filter (42, 44). 24. Air purification device according to one of claims 1 to 23, characterized in that the filter (42, 44) is formed by a filter basket (42) with a filter bag (44) removably arranged therein.