Abstract
A invention relates to a filter device for a vacuum cleaner having a turbine device and a motor for generating a first main air stream and/or a second main air stream through a collecting tank of the vacuum cleaner, wherein the vacuum cleaner includes two chambers and filter elements of the filter device are dedusted by an abrupt change in position of a pressure shock element in the chambers. Since, when one of the two chambers is being dedusted, the suction operation of the vacuum cleaner can be maintained through the other chamber, the filter dedusting can advantageously take place during continued suction operation of the vacuum cleaner. A method for dedusting a filter device in a vacuum cleaner, wherein, as a result of a valve being actuated, an air volume is driven out of one of the two chambers. As a result of this change in pressure, the pressure shock element is advantageously made to change position, and this can result in a backflushing pulse and mechanical shaking of the filter element, and dedusting of the filter device.
Claims
1-15. (canceled)
16. A filter device for a vacuum cleaner having a turbine device and a motor for generating a first main air stream or a second main air stream through a collecting tank of the vacuum cleaner, the filter device comprising: a first chamber and a second chamber, each having a filter element and an inflow opening, a valve being designed to open or to close the inflow opening, wherein a negative pressure prevails in the respective first or second chamber when the inflow opening is closed and wherein atmospheric pressure prevails in the respective first or second chamber when the inflow opening is open, the first and second chambers also each including a pressure shock element, the pressure shock elements have a parked position and a dedusting position, a switchover between the parked position and the dedusting position takes place by letting in the atmospheric pressure by actuating the valve, the pressure shock elements being designed to apply a pulse to the respective filter element when the dedusting position is taken up so that the filter element is dedusted.
17. The filter device as recited in claim 16 further comprising turbine openings designed to allow a flow connection between the chambers and the turbine device.
18. The filter device as recited in claim 16 wherein the first and second chambers have inlet openings and wherein the filter elements are designed to close the inlet openings such that dust particles are filtered out of the first and second main air streams.
19. The filter device as recited in claim 16 further comprising axial guides for guiding the pressure shock elements.
20. The filter device as recited in claim 17 wherein the turbine openings are present in side walls of the chambers or in axial guides for guiding the pressure shock elements.
21. The filter device as recited in claim 16 further comprising ventilation channels to connect the chambers to an environment of the vacuum cleaner.
22. The filter device as recited in claim 16 wherein the first and second chambers are arranged alongside one another in the vacuum cleaner.
23. The filter device as recited in claim 16 wherein the first and second main air streams flow into the first and second chambers from the side and are subsequently deflected into a vertical flow.
24. The filter device as recited in claim 16 wherein the first and second main air streams flow into the first and second chambers from below and form a vertical flow.
25. The filter device as recited in claim 16 wherein the first and second chambers have bypass channels or springs designed to support restoration of the pressure shock elements.
26. A method for dedusting a filter device in a vacuum cleaner, the method comprising the following steps: a) providing the filter device as recited in claim 16; b) operating the vacuum cleaner, wherein, during operation of the vacuum cleaner, a negative pressure prevails in a collecting tank of the vacuum cleaner and in at least the first chamber or in the second chamber; c) generating atmospheric pressure in one of the first and second chambers by actuating a valve, wherein, as a result of the valve being actuated, an inflow opening of the respective first or second chamber is opened and a pressure shock element within the respective first or second chamber is made to change position from a parked position into a dedusting position; and d) dedusting the filter element by the change in position of the pressure shock element.
27. The method as recited in claim 26 wherein when the vacuum cleaner is in operation, a first main air stream or second main air stream is generated, the first or second main air stream forming between a suction hose inlet and the turbine device.
28. The method as recited in claim 26 wherein, when one of the valves is opened, a pressure equalizing stream passes into the first chamber or into the second chamber.
29. The method as recited in claim 26 wherein the filter element of one of the first and second chambers is dedusted upon continued suction operation through the other of the first and second chambers.
30. The method as recited in claim 26 wherein turbine openings designed to allow a flow connection between the chambers and the turbine device are closed by the change in position of the pressure shock element.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0048] Further advantages will become apparent from the following description of the figures. Various exemplary embodiments of the present invention are illustrated in the figures. The figures, the description and the claims contain numerous features in combination. A person skilled in the art will expediently also consider the features individually and combine them to produce useful further combinations.
[0049] In the figures, identical and similar components are denoted by the same reference signs.
[0050] In the figures:
[0051] FIG. 1 shows a schematic side view of a vacuum cleaner having a preferred embodiment of the filter device with main air streams flowing in from the side
[0052] FIG. 2 shows a schematic illustration of the vacuum cleaner while both chambers are participating in suction operation
[0053] FIG. 3 shows a schematic illustration of the vacuum cleaner at the start of filter dedusting of the second chamber
[0054] FIG. 4 shows a schematic illustration of the vacuum cleaner while the filter element of the second chamber is being dedusted
[0055] FIG. 5 shows a schematic illustration of the vacuum cleaner while the filter element of the second chamber is being dedusted
[0056] FIG. 6 shows a schematic illustration of the vacuum cleaner at the end of the dedusting process of the second chamber
[0057] FIG. 7 shows a schematic illustration of the vacuum cleaner at the start of filter dedusting of the first chamber FIG. 8 shows a schematic illustration of the vacuum cleaner while the filter element of the first chamber is being dedusted
[0058] FIG. 9 shows a schematic illustration of the vacuum cleaner at the end of the dedusting process of the first chamber
[0059] FIG. 10 shows a schematic side view of a vacuum cleaner during the restoration of the pressure shock elements
[0060] FIG. 11 shows a schematic side view of a vacuum cleaner having a preferred embodiment of the filter device in a horizontal arrangement
[0061] FIG. 12 shows a schematic illustration of the vacuum cleaner while both chambers are participating in suction operation, wherein the turbine openings are present in the axial guides
DETAILED DESCRIPTION
[0062] FIG. 1 shows a side view of a vacuum cleaner 1 having a preferred embodiment of the filter device 2 in a vertical arrangement. According to the invention, the wording “vertical arrangement” preferably means that a main air stream 4a, 4b initially flows into the chambers 6a, 6b from the side before the main air stream 4a, 4b is deflected in the chambers 6a, 6b such that it flows preferably in an upward spatial direction, i.e. preferably in the direction of the turbine 3 of the vacuum cleaner 1. Illustrated in a lower region of the vacuum cleaner 1 is the dust collecting tank 5, which has a suction hose inlet 19. A suction hose, which can be connected for example to a floor nozzle, can be attached to this suction hose inlet 19. Through the suction hose, dust particles or drilling dust can be sucked in. The sucked-in dust then passes through the suction hose inlet 19 into the dust collecting tank 5 of the vacuum cleaner 1.
[0063] The upper region of the vacuum cleaner 1 is formed by a vacuum cleaner head 23. Located in the vacuum cleaner head are, for example, the turbine 3 and the motor 22, with which the negative pressure for sucking in the dust particles and drilling dust is generated. The vacuum cleaner 1 has ventilation channels 20a, 20b with which air can be sucked in from the environment of the vacuum cleaner 1 through openings in the housing. This air sucked in through the ventilation channels 20, 20b can form for example a pressure equalizing stream when pressure equalization is intended to take place in the vacuum cleaner 1, or the chambers 6a, 6b thereof. This can be the case for example when the negative pressure within a chamber 6a, 6b of the vacuum cleaner 1 is intended to be interrupted in order to carry out filter dedusting. It is necessary to dedust the filter elements 7a, 7b for example when the filter elements 7a, 7b of the filter device 2 are clogged with dust. The initially loose dust can solidify to form a filter cake 24 (see, e.g., FIG. 3), which can be detached from the filter elements 7a, 7b only with difficulty. In order to provide effective filter dedusting in which in particular the suction operation of the vacuum cleaner 1 does not need to be interrupted, the invention is presented in the following text:
[0064] Provided between the dust collecting tank 5 and the vacuum cleaner head 23 are two chambers 6a, 6b, the filters 7a, 7b of which can be dedusted alternately according to the invention, while the suction operation of the vacuum cleaner 1 can be continued in the respectively other chamber 6a, 6b. The chambers 6a, 6b are formed in a substantially identical manner, for example axisymmetrically to a partition wall separating the two chambers, and so in particular the first chamber 6a is described in the following text. This is the left-hand chamber in the figures. Located in terms of flow in a front region of the chamber 6a is an inlet opening 13a (see, e.g., FIG. 4), through which the dust-laden air stream 4a is sucked from the dust collecting tank 5 in the direction of the turbine 3. In order to protect the turbine 3 from the dust, a filter element 7a is provided upstream of the inflow opening 13a, said filter element 7a being designed to filter a substantial proportion of the dust out of the air stream 4a. According to the invention, it is preferred that the filter elements 7a, 7b can consist of two separate filters. Alternatively, the filter elements 7a, 7b can be formed by a filter that is subdivided into two filter elements. Once the air stream 4a has passed through the inlet opening 13a and the filter element 7a, the air stream 4a passes into a front space of the first chamber 6a. Provided in the first chamber 6a is a pressure shock element 11a. The pressure shock element 11a can be present in two states, wherein the pressure shock element 11a is preferably in a parked position during suction operation of the first chamber 6a. The parked position of the first pressure shock element 11a is, in particular, characterized in that a turbine opening 9a of the first chamber 6a is opened up such that the main air stream 4a can pass or be sucked from the first chamber 6a into the flow channel portion 21. The pressure shock elements 11a, 11b can be guided by axial guides 14a, 14b so as to allow a substantially vertical up and down movement of the pressure shock elements 11a, 11b.
[0065] The rear space of the first chamber 6a has an inflow opening 8a which opens into a first ventilation channel 20a. The ventilation channel 20a has ventilation openings or slots via which air can flow into the ventilation channel 20a from the environment of the vacuum cleaner. In order to allow this, a first valve 10a is provided in the ventilation channel 20a, with which the ventilation openings or slots in the ventilation channel 20a can be opened or closed. When the valve 10a in the ventilation channel 20a is open, this is preferably referred to, according to the invention, as the filter dedusting position, while the valve 10a is in the closed state in the suction operation position.
[0066] In FIG. 2, the turbine openings 9a, 9b can also be seen, which are preferably constituents of the filter device 2. The turbine openings 9a, 9b can be present in side walls of the chambers 6a, 6b. This configuration of the invention is illustrated in FIG. 2. However, the turbine openings 9a, 9b can also be present in the axial guides 14a, 14b, which are designed to guide the movement of the pressure shock elements 11a, 11b. In this case, internal extraction is realized and it is possible to dispense with outer turbine channels, for example the flow channel portion 21, in the construction of the filter device 2. This makes it easier and simpler to produce the filter device 2.
[0067] During suction operation of the first chamber 6a—as depicted for example in FIGS. 4 and 5—the valve 10a is set such that a turbine opening 9a of the first chamber 6a is open. Through the open turbine opening 9a, there is a flow connection between the first chamber 6a and the turbine 3. As a result, a negative pressure prevails in the first chamber 6a, and in the entire dust collecting tank 5 of the vacuum cleaner 1, such that dust can be sucked into the interior of the vacuum cleaner through the suction hose inlet 19. In particular, the air stream 4a can pass through the open turbine opening 9a into the region of the turbine 3. To this end, the air stream 4a can flow through a flow channel portion 21a that is provided between the turbine opening 9a and the turbine 3.
[0068] FIGS. 2 and 3 show a schematic illustration of the vacuum cleaner 1 while both chambers 6a, 6b are participating in suction operation. The dark regions in FIGS. 3 to 5, 7 and 8 are intended to represent the regions of the vacuum cleaner 1 in which atmospheric pressure prevails. In the exemplary embodiment of the invention that is illustrated in FIG. 2, both valves 10a, 10b of the vacuum cleaner 1 are in the suction operation position and the pressure shock elements 11a, 11b of the two chambers 6a, 6b are each in the parked position, such that the air streams 4a and 4b can flow from the dust collecting tank 5 through the filter elements 7a, 7b in the direction of the turbine 3. In the process, the main air streams 4a, 4b flow past the pressure shock elements and pass unimpeded into the flow channel portions 21a, 21b.
[0069] The suction operation mode of the vacuum cleaner 1 is in particular characterized in that a negative pressure prevails in the dust collecting tank 5 and in the chambers 6a, 6b that participate in suction operation. This negative pressure also prevails in the flow channel portions 21a, 21b of the chambers 6a, 6b participating in suction operation. The negative pressure is generated by the turbine 3 and the motor 22 and is responsible for the formation of the air streams 4a and 4b that allow air and dust to be sucked into the vacuum cleaner 1.
[0070] As a result of the suction operation of the vacuum cleaner 1, the filter elements 7a, 7b can become clogged with dust with the result that the filtering capacity is reduced. This can represent a risk to the motor 22 and the turbine 3 when these components of the vacuum cleaner 1 are exposed to too much dust. Therefore, the filter elements 7a, 7b of the filter device 2 are regularly dedusted so that for example solidified filter cake 24 can be detached from the filter elements 7a, 7b. To this end, a filter dedusting process is initiated in one of the two chambers 6a, 6b. The start of filter dedusting of the second chamber 6b is illustrated starting with FIG. 3.
[0071] In the following text, a filter dedusting process of the second chamber 6b of the vacuum cleaner 1, or of the filter element 7b of the second chamber 6b of the vacuum cleaner 1 is described. The second chamber 6b is depicted on the right-hand side of the vacuum cleaner 1 in the figures. The filter dedusting process is started by actuating the valve 10b, which can be shifted for example from the suction operation position into the filter dedusting position. The opening of the ventilation valve 10b is symbolized in FIG. 3 by the outlined upward arrow above the valve 10b. As a result of the valve 10b being actuated, the ventilation channel 20b of the second chamber 6b, or the inflow opening 8b of the second chamber 6b, is opened and a pressure equalizing stream can flow into the second chamber 6b. The pressure equalizing stream is preferably formed by air that is sucked into the second ventilation channel 20b through the ventilation openings and slots, wherein this air can pass into the second chamber 6b of the vacuum cleaner 1 through the inflow opening 8b. The pressure equalizing stream preferably ensures that pressure equalization takes place in the second chamber 6b, i.e. the prevailing negative pressure collapses and is driven out by the atmospheric pressure prevailing in the environment of the vacuum cleaner 1. As a result of the penetration of atmospheric pressure, the pressure shock element 11b in the second chamber 6b is made to move down. The downward movement of the pressure shock element 11b is represented by the dark arrows without an outline beneath the pressure shock element 11b. In this case, both arrows point downward, i.e. in the direction of the downward movement of the pressure shock element 11b. The abovementioned arrows are also included in FIG. 4. In other words, the second pressure shock element 11b moves down and carries out a vertical movement. As a result of this substantially vertical downward movement, the air that remained between the pressure shock element 11b and the filter element 7b can be compressed. As a result, a dedusting pulse is generated, which advantageously acts on the filter element 7b and dedusts the latter in that the filter cake 24 is detached and can drop into the dust collecting tank 5 of the vacuum cleaner 1. Furthermore, the filter 7b can be mechanically shaken by the pressure shock element 11b, with the result that the dedusting of the filter 7b is even more effective. According to the invention, it is preferred that parts of the pressure shock elements 11a, 11b fill a width of the chambers 6a, 6b substantially over the entire area such that the pressure shock elements 11a, 11b are pushed down particularly readily and effectively by the penetrating pressure equalizing stream.
[0072] According to the invention, it is preferred that the inflow opening 8b is fluidically connected to the second ventilation channel 20b, which is connected in terms of flow to the environment of the vacuum cleaner 1 by ventilation openings and slots. As a result of this fluidic connection between the outflow opening 8b and the environment of the vacuum cleaner 1, a pressure equalizing air stream can pass into the second chamber 6b through the inflow opening 8b and so a substantial weakening of the negative pressure in the second chamber 6b occurs. The pressure equalizing air stream passes from the environment of the vacuum cleaner into the second chamber 6b through the ventilation channel 20b of the second chamber 6b. The pressure equalizing air stream ensures in the second chamber 6b that the pressure shock element 11b moves down and as a result causes the filter 7b to be dedusted. As a result of the downward movement of the pressure shock element 11b, substantial mechanical shaking of the filter element 7b can occur, wherein an intensity of the shock is set such that any solidified filter cake 24 can be detached from the filter element 7b. Furthermore, it is also possible for loose dust located in the filter element 7b to be shaken off by the mechanical shaking. As illustrated in FIGS. 5 and 8, the detached filter cake 24 drops into the dust collecting tank 5 so that it can be disposed of later together with the rest of the sucked-in dust. It is apparent from FIGS. 4 and 5 that, during the dedusting of the filter element 7b in the second chamber 6b of the vacuum cleaner 1, the air stream 4b is blocked, while the air stream 4a can continue to flow through the first chamber 6a of the vacuum cleaner 1.
[0073] Provision can also be made according to the invention for the transmission of the pulse of the pressure equalizing air stream between the pressure shock element 11b and the filter element 7b to take place in a contactless manner. In this case, the pressure shock element 11b and the filter element 7b are designed such that the abrupt compression of the air in the front region of the second chamber 6b is enough to bring about sufficiently great mechanical shaking of the filter element 7b. The exploitation of a pulse of a pressure equalizing air shock for providing efficient filter dedusting with simultaneously continuing suction operation of a vacuum cleaner can preferably also be referred to as backflushing or a backflushing process according to the invention.
[0074] At the same time, as a result of the downward movement of the pressure shock element 11b, the turbine opening 9b of the second chamber 6b is closed, such that there is no longer a fluidic flow connection between the second chamber 6b and the turbine 3 of the vacuum cleaner 1. According to the invention, this preferably means that the pressure shock element 11b closes the right-hand flow path, i.e. the path of the second main air stream 4b, which flows from the second chamber 6b through the turbine opening 9b and the flow channel portion 21b in the direction of the turbine 3 of the vacuum cleaner 1. As a result of the flow path through the right-hand chamber 6b being blocked, a negative pressure is prevented from building up or being maintained in the second chamber 6b of the vacuum cleaner 1 and the filter dedusting of the second filter element 7b is promoted.
[0075] FIG. 6 shows a schematic illustration of the vacuum cleaner 1 at the end of the dedusting process of the second chamber 6b. The end of the dedusting process is started by re-actuation of the valve 10b, wherein the ventilation channel 20b or the inflow opening 8b of the second chamber 6b is closed by the actuation of the valve 10b. The closing of the ventilation valve 10b is indicated in FIG. 6 by the outlined downwardly directed arrow above the valve 10b. As a result of the second ventilation channel 20a being closed, there is no longer a fluidic connection between the second chamber 6b and the environment of the vacuum cleaner 1. The pressure shock element 11b moves back up such that the turbine opening 9b of the second chamber 6b is opened up and a negative pressure can build up in the second chamber 6b again. The movement of the pressure shock element 11b in the “upward” spatial direction is indicated by the two dark arrows which are depicted beneath the pressure shock element 11b. As a result of the turbine opening 9b of the second chamber 6b being opened up, a negative pressure can build up in the second chamber 6b again, as is necessary for carrying out suction operation. In particular, a suction air stream 4b again flows from the dust collecting tank 5 into the second chamber 6b and through the turbine opening 9b onward to the turbine 3. FIGS. 7 to 9 show a filter dedusting process of the first chamber 6a of the filter device 2. In this case, the contents of FIGS. 4 and 7, 5 and 8 and 6 and 9 correspond in each case, wherein the reference signs “b” in the description should be replaced by an “a”. Therefore, a detailed explanation of FIGS. 7 to 9 will not be given. It is apparent from FIGS. 7 and 8 that, during the dedusting of the filter element 7a in the first chamber 6a of the vacuum cleaner 1, the air stream 4a is blocked, while the air stream 4b can continue to flow through the second chamber 6a of the vacuum cleaner 1. The opening of the ventilation valve 10a is symbolized in FIG. 7 by the outlined upward arrow above the valve 10a. In FIG. 8, this arrow means the ventilation valve 10a is open. The dark arrows beneath the pressure shock element 11a, which point downward in FIGS. 7 and 8, symbolize the vertical downward movement of the pressure shock element 11a as a result of the atmospheric pressure penetrating into the first chamber 6a. The dedusting of the filter element 7a that is carried out thereby ensures that the filter cake 24 detaches from the filter element 7a and drops into the collecting tank 5. The suction operation of the vacuum cleaner 1 is continued substantially without an interruption through the second chamber 6b.
[0076] In FIG. 9, the two ventilation valves 10a, 10b are closed. In the first chamber 6a that has just been dedusted, negative pressure builds up again and the pressure shock element 11a moves in an upward spatial direction into the parked position. The two turbine openings 9a, 9b are now open again and the main air streams 4a, 4b can flow through the respective chambers 6a, 6b of the vacuum cleaner 1. Therefore, both flow paths in the vacuum cleaner 1, and the flow channel portions 21a, 21b are open, while the inflow openings 8a, 8b and the ventilation channels 20a, 20b are closed.
[0077] FIG. 10 shows the restoration of the pressure shock elements 11a, 11b following completion of the dedusting of the filter elements 7a, 7b. The restoration of the pressure shock elements 11a, 11b can be implemented technically in particular in two ways. According to a first alternative, what are known as bypass channels 12a, 12b can be provided between the chambers 6a, 6b and the turbine 3, or the turbine inlet, a particularly large negative pressure prevailing in said bypass channels 12a, 12b on account of their design and their vicinity to the turbine 3. This large negative pressure in the bypass channels 12a, 12b of the chambers 6a, 6b can advantageously be used in order to cause the pressure shock elements 11a, 11b to move vertically upward. In other words, the pressure shock elements 11a, 11b can be sucked upward by the large negative pressure prevailing in the bypass channels 12a, 12b, such that they return to the parked position, in which the suction operation through the respective chamber 6a, 6b can be carried out. In addition or alternatively to the bypass channels 12a, 12b, springs 25a, 25b can be provided in the vacuum cleaner 1. These springs 25a, 25b can be for example compression springs which are compressed by the downward movement of the pressure shock elements 11a, 11b. After the end of the dedusting of the filter elements 7a, 7b, the pressure shock elements 11a, 11b can be restored into the parked position with the aid of the spring force stored in the springs 25a, 25b. Therefore, according to the invention, it is preferred that bypass channels 12a, 12b and/or springs 25a, 25b are provided in the chambers 6a, 6b of the vacuum cleaner 1, said bypass channels 12a, 12b and/or springs 25a, 25b being designed to bring about and/or support restoration of the pressure shock elements 11a, 11b.
[0078] FIG. 11 shows a schematic side view of a vacuum cleaner 1 having a preferred embodiment of the filter device 2 in a horizontal arrangement. What is illustrated is a vacuum cleaner 1 having a vacuum cleaner head 23 in an upper region and a dust collecting tank 5 in a lower region of the vacuum cleaner 1. The turbine 3 and the motor 22 are provided in the vacuum cleaner head 23. The dust collecting tank 5 has a suction hose inlet 19 for connecting a suction hose. Provided in the dust collecting tank 5 are two chambers 6a, 6b, which, in the configuration of the vacuum cleaner 1 illustrated in FIG. 11, are flowed through by air streams 4a, 4b that flow from bottom to top, while the direction of flow in the vacuum cleaner 1 in FIG. 1 (vertical arrangement of the chambers 6a, 6b) is in a lateral direction from right to left or from left to right.
[0079] On flowing through the chambers 6a, 6b, the air streams 4a, 4b first of all pass through the filter elements 7a, 7b before they pass through the inlet openings 13a, 13b into the front part of the chambers 6a, 6b. From there, the air streams 4a, 4b continue on their way through the turbine openings 9a, 9b until they pass into the flow channel portions 21a, 21b upstream of the turbine 3. In the process, the turbine openings 9a, 9b are opened up by the pressure shock elements 11a, 11b in the case of suction operation and are closed in the case of dedusting.
[0080] The inflow openings 8a, 8b of the chambers 6a, 6b are fluidically connected to ventilation channels 20a, 20b, which are in a flow connection with the environment of the vacuum cleaner 1 (see also FIG. 1). In this way, pressure equalizing streams can pass into the chambers 6a, 6b through the inflow openings 8a, 8b. These pressure equalizing streams weaken the negative pressure in the chamber to be dedusted and the pressure shock elements 11a, 11b are made to move down within the respective chambers 6a, 6b. In the process, the pressure shock elements 11a, 11b generate dedusting pulses in the direction of the filter elements 7a, 7b. The pulses of the pressure equalizing streams can preferably be transmitted to the filter elements 71, 7b by contact or contactlessly, with the result that the filter elements 7a, 7b are mechanically shaken. This in turn results in effective dedusting of the filter elements 7a, 7b.
[0081] Tests have shown that especially a horizontal arrangement of the filter device 2 can result in a particularly compact vacuum cleaner 1, in which the filter device 2 takes up only a little installation space.
[0082] In the exemplary embodiment of the invention illustrated in FIG. 12, the two chambers 6a, 6b of the filter device 2 are participating in the suction operation of the vacuum cleaner 1. The ventilation valves 10a, 10b are closed, as are the inflow openings 8a, 8b of the two chambers 6a, 6b. The pressure shock elements 11a, 11b are in their parked position in the upper region of the chambers 6a, 6b. As a result, the turbine openings 9a, 9b are free and the suction streams 4a, 4b can be sucked in through the turbine openings 9a, 9b in the direction of the turbine 3. In the exemplary embodiment of the invention illustrated in FIG. 12, the turbine openings 9a, 9b are arranged in the axial guides 14a, 14b. The turbine openings 9a, 9b can be formed in particular by opening slots in the axial guides 14a, 14b, wherein the axial guides 14a, 14b can be formed in particular by tubes or can comprise tubes. The flow channel portions 21a, 21b can be located in particular in the axial guides 14a, 14b in this configuration of the invention.
LIST OF REFERENCE SIGNS
[0083] 1 Vacuum cleaner [0084] 2 Filter device [0085] 3 Turbine device [0086] 4 Main air stream, 4a: first main air stream, 4b: second main air stream [0087] 5 Collecting tank [0088] 6 Chamber, 6a: first chamber, 6b: second chamber [0089] 7 Filter element, 7a: first filter element, 7b: second filter element [0090] 8 Inflow opening, 8a: first inflow opening, 8b: second inflow opening [0091] 9 Turbine opening, 9a: first turbine opening, 9b: second turbine opening [0092] 10 Valve, 10a: first valve, 10b: second valve [0093] 11 Pressure shock element, 11a: first pressure shock element, 11b: second pressure shock element [0094] 12 Bypass channels, 12a: bypass channel in the first chamber, 12b: bypass channel in the second chamber [0095] 13 Inlet opening, 13a: first inlet opening, 13b: second inlet opening [0096] 14 Axial guide, 14a: first axial guide, 14b: second axial guide [0097] 19 Suction hose inlet [0098] 20 Ventilation channel [0099] 21 Flow channel portion [0100] 22 Motor [0101] 23 Vacuum cleaner head [0102] 24 Filter cake [0103] 25a and 25b Springs
