Suction cleaner having at least three turbines

Abstract

The present invention relates to a suction cleaner for taking in dust by means of a suction stream. The suction cleaner comprises at least a first, second and third turbine, wherein the suction cleaner is designed to allow the suction stream to flow through the turbines one after the other and / or in parallel. For this purpose, the suction cleaner can have a valve arrangement with at least two valves, by means of which the suction stream can be guided through the turbines one after the other and / or in parallel with one another. This makes it possible to provide a particularly flexible suction cleaner which, on account of the switching and / or activation of the turbines, can allow different suction stream volume flows or negative pressure values within the suction cleaner.

Description

[0001] VACUUM DEVICE WITH AT LEAST THREE TURBINES

[0002] The present invention relates to a vacuum cleaner for vacuuming dust by means of a suction flow. The vacuum cleaner comprises a first, second, and third turbine, wherein the vacuum cleaner is configured to allow the suction flow to flow sequentially and / or in parallel through the turbines. For this purpose, the vacuum cleaner can have a valve arrangement with at least two valves, with which the suction flow can be guided sequentially and / or in parallel through the turbines. In this way, a particularly flexible vacuum cleaner can be provided which, due to the switching or control of the turbines, can enable different volume flows of the suction flow or negative pressure values ​​within the vacuum cleaner and is thus usable for a wide range of applications.

[0003] Background of the invention:

[0004] Vacuum cleaners are known in the art that can generate a suction current, which sucks in dust along with the suction current. A turbine is typically used to generate the suction current, which can create a negative pressure. Vacuum cleaners are well known in the household sector, for example, for vacuuming floors, carpets, or furniture. However, vacuum cleaners are also used on construction sites to extract dust and particles generated when working with machine tools. This can reduce the dust exposure to which a machine tool user is exposed, making a valuable contribution to protecting the user's health.

[0005] The vacuum cleaners known from the prior art often suffer from the disadvantage that the vacuum cleaners are generally designed for a specific application and the associated suction and operating properties cannot be changed during the lifetime of the vacuum cleaner. When designing the vacuum cleaner, a selection decision often has to be made, for example whether the vacuum cleaner should generate a high flow velocity or a strong negative pressure, since a combination of these different properties is often not possible. To avoid such a selection decision and the associated disadvantages, vacuum cleaners with two suction units have been proposed in the prior art. For example, EP 2 421 630 A1 discloses a vacuum cleaner with two turbines, wherein the turbines in the vacuum cleaner of EP 2 421 630 A1 are passed through by a suction stream in parallel.The disadvantage of such a parallel arrangement is that it only increases the volume flow, but not the pressure level.

[0006] The object underlying the present invention is to overcome the deficiencies and disadvantages of the prior art described above and to provide a vacuum cleaner which optimally covers a large number of applications and in which the suction and operating properties can be flexibly changed or adjusted during its operation.

[0007] The object is solved by the subject matter of independent claim 1. Advantageous embodiments of the subject matter of independent claim 1 can be found in the dependent claims.

[0008] Description of the invention:

[0009] According to the invention, a vacuum cleaner is provided for sucking in dust by means of a suction flow, wherein the vacuum cleaner has at least a first turbine, a second turbine, and a third turbine, wherein the vacuum cleaner is configured to allow the suction flow to flow through the turbines sequentially and / or in parallel. The present invention makes it possible to provide a vacuum cleaner that does not require actively controlled valves. In particular, the invention makes it possible to exploit the advantages of turbines or suction motors connected in series or parallel without having to accept the frequent failure or high maintenance costs of actively controlled valves. In order to activate the individual turbines of the proposed vacuum cleaner, check valves can be used, which are advantageously passively controlled valves.For the purposes of the invention, passively controlled valves are preferably valves that do not require actuation and are not moved, for example, by servo motors. Rather, "passively controlled" valves open or close essentially by themselves by adapting to the direction of a passing air stream. For the purposes of the invention, it is preferred that "passively controlled" valves open or close essentially by themselves, depending on the source of the air stream. Check valves are typical examples of "passively controlled" valves for the purposes of the invention. Preferably, "passively controlled" valves are designed to allow air flow in only one direction, the flow direction, while preventing air flow in another, for example, opposite, direction.

[0010] Advantageously, the suction flow of the proposed suction device can be controlled using very simple, or "passive," non-return valves. A particular advantage of the invention is that it allows for combined switching on and off of the individual turbines of the suction device, depending on the needs and the required power or vacuum level of an application.

[0011] With the invention, by providing three turbines that can be operated in series and / or parallel to one another, a vacuum cleaner with an extended characteristic suction curve can be provided, so that a multitude of applications can be covered with the vacuum cleaner. Thus, a particularly flexible suction device can be provided that can be optimized either for a high volume flow or for a high negative pressure in the suction device. Of course, intermediate stages between the extreme operating states of "maximum volume flow" and "maximum negative pressure" can also be set by suitable control and / or switching of the three turbines. By providing three or more suction motors, a suction or power curve of the suction device can be particularly differentiated and different applications can be mapped particularly well through suitable control of the suction motors.This allows the proposed suction device to be used particularly flexibly, as it is superior in terms of flexibility to conventional state-of-the-art suction devices which, for example, only have a speed control of one suction motor.

[0012] For the purposes of the invention, the term "dust" is preferably used as a generic term for various types of vacuumed material. For example, the "dust" can include solids and / or liquids. In other words, the vacuumed material can be dry and dust-like, formed from a liquid, or a mixture of dry vacuumed material, such as dust, drilling dust, particles, and a liquid, such as water, which is used, for example, as rinsing or cooling water on a construction site when carrying out work with machine tools. The vacuum cleaner can therefore be a dry vacuum cleaner or a wet / dry vacuum cleaner. For the purposes of the invention, it is preferred that the vacuum cleaner also be referred to as a "vacuum cleaner."

[0013] According to the invention, it is preferred that air laden with suction material is sucked in through an opening within the vacuum cleaner (“suction inlet”) and forms a suction flow. The suction flow flows through a collecting container for receiving suction material (“dust collection container”), where a large portion of the suction material or dust is deposited. The suction flow is then passed through a filter, through which the suction flow is further cleaned. The suction flow is generated by a turbine driven by a motor of the vacuum cleaner. The turbine and motor are arranged behind the filter in the direction of the suction flow. The dust collection container can, for example, form a lower part of the vacuum cleaner, onto which an upper part or vacuum head can be placed. The vacuum head can, for example, comprise the suction motor or turbine with which the suction flow is generated.The suction device can be connected to a machine tool, such as a drill, a saw, a chisel, or a cutting or grinding device, wherein the suction device is configured to extract the dust generated during operation of the machine tool. Thus, the suction material can include, in particular, dust or dust particles. The machine tool and the suction device can be communicatively, mechanically, and / or electrically connected to each other in a known manner.

[0014] According to the invention, it is preferred that the vacuum cleaner has a valve arrangement, wherein the valve arrangement is configured to allow the suction flow to flow through the turbines sequentially and / or in parallel. According to the invention, it is preferred that switching between series operation and parallel operation of the turbines can occur automatically. The different possible combinations of series operation and parallel operation of the individual turbines are preferably referred to as "operating states of the vacuum cleaner" according to the invention; the operating states are described in detail below. For example, the valve arrangement of the vacuum cleaner can switch between two different operating states if a vacuum limit is exceeded or undershot.In other words, it may be preferred within the meaning of the invention for switching between the operating states of the vacuum cleaner to occur depending on the negative pressure conditions in the vacuum cleaner. The valve arrangement preferably comprises at least two valves, with which the suction flow can be guided through the suction device in a desired manner. Of course, the proposed suction device can also have three, four, five, six, seven or more valves, without being limited thereto. Likewise, the proposed suction device can also have four, five, six, seven or more suction motors or turbines, without being limited thereto. The terms "turbine" and "suction motor" are preferably used synonymously in the context of the present invention.

[0015] According to the invention, it is preferred that the valve arrangement has at least a first valve and a second valve, the first valve being arranged between the first turbine and the second turbine, and the second valve being arranged between the second turbine and the third turbine. As a result, a suction line between the first turbine and the second turbine can be closed or opened using the first valve. In other words, the position of the first valve determines whether the suction flow, which preferably comes from the filter, can flow through both the first and the second turbine, or whether the suction flow only flows through one of the two turbines. In one exemplary embodiment of the invention, the suction flow can, for example, flow through the first and the second turbine when the first valve of the valve arrangement is open, while the suction flow only flows through the second turbine when the first valve is closed.This embodiment of the invention is shown, for example, in Figure 3.

[0016] According to the invention, it is preferred that the first turbine and the second turbine are arranged parallel to one another. The suction flow from the direction of the filter preferably arrives at a first branch between the first turbine and the second turbine, wherein the first valve of the valve arrangement can be provided in the region of this first branch. Depending on the position of the first valve, the suction flow can then flow through both turbines (the first and the second turbine) or only through one of the two turbines (preferably the second turbine). If the suction flow flows through both turbines, i.e. through the first and the second turbine, the suction flow preferably splits up and flows in parallel through the first and the second turbine. The resulting partial flows can be essentially the same size or different sizes. The open position of the first valve and / or the ratio of the cross sections orThe diameter of the suction lines leading to the first and second turbines determines how the partial flows relate to each other in terms of volume.

[0017] Preferably, the first part of the suction flow flowing through the first turbine can then be guided via a suction line to an edge region of the suction device, where the preferably cleaned suction flow can be discharged via an outlet opening to an environment of the suction device.

[0018] The second part of the suction flow, which flows through the second turbine, can preferably continue to flow towards the third turbine, since the second turbine and the third turbine can preferably be arranged one after the other in the direction of the suction flow. Before the suction flow reaches the third turbine, a second branch is preferably reached, near which the second valve of the valve arrangement can be arranged. Depending on the position of the second valve, the suction flow can then flow directly towards another outlet opening of the suction device in order to be discharged into the environment of the suction device. This is particularly the case when the second valve is open (see Figure 2).When the second valve is closed, the suction line is blocked in the direction of the further outlet opening and the suction flow coming from the second turbine can flow through the third turbine and then leave the suction device through a still further outlet opening (Figures 1, 3 and 4).

[0019] According to the invention, it is preferred that during suction operation of the suction device, the suction flow flows through at least one of the turbines. In the exemplary embodiments of the invention shown in the figures, the suction flow always flows through the second turbine, while the flow through the first and third turbines depends on the position of the valves in the valve arrangement or on the control of the suction motors. Due to this variable adjustment option as to which of the three turbines the suction flow flows through entirely or partially, a particularly flexible suction device can be provided that can be used for many different applications - for example, on a construction site. In this way, a user advantageously only needs to carry one suction device and can still handle many different tasks satisfactorily.In addition to the embodiments of the invention shown in the figures, an operating state is also conceivable in which only the second turbine is flowed through by the suction flow.

[0020] According to the invention, it is preferred that the volume flow of the suction flow is essentially at its maximum when the suction flow flows through the first turbine and through the second turbine. This can be achieved, for example, by the first valve and the second valve being open. In other words, the volume flow of the suction flow is essentially at its maximum when the first valve and the second valve are open. A large volume flow is particularly advantageous when the proposed suction device is to be connected to a machine tool which, during operation, generates a relatively large amount of dust. For such dusty applications, a suction hose with a large diameter is often used, so that a relatively large volume flow is required to ensure a sufficiently high entrainment or flow velocity of the air flow or dust particles.

[0021] According to the invention, it is preferred that the negative pressure within the suction device is substantially maximum when the suction flow flows successively through the second turbine and through the third turbine. This can be achieved, for example, by the first valve and the second valve being closed. In other words, the negative pressure within the suction device is substantially maximum when the first valve and the second valve are closed. A high negative pressure is particularly advantageous when the proposed suction device is to be connected to a suction nozzle or a suction hose with a very small diameter. In order to achieve a good suction effect in such tight suction scenarios, high negative pressures are required, as can be achieved, for example, by the suction flow passing through the second and third turbines one after the other in the proposed suction device.

[0022] According to the invention, it is preferred that all three turbines be flowed through by the suction flow when the first valve is open and the second valve is closed. This situation is illustrated by way of example in Figures 1 and 4.

[0023] According to the invention, it is preferred that the first valve and / or the second valve be designed as a check valve. Check valves are, according to the invention, so-called "passively controlled" valves, which in particular do not require "active control." This enables particularly simple switching between the operating states of the suction device. In particular, the proposed suction device is thus low-maintenance and robust against errors and malfunctions.

[0024] According to the invention, it is preferred that the first valve is arranged in spatial proximity to a first branch, while the second valve is arranged in spatial proximity to a second branch. The first valve is preferably designed to open or close a path to a first turbine, while the second valve is preferably designed to open or close a path to a third turbine. The first valve preferably decides whether the suction flow coming from the filter flows only through the second turbine or also through the first turbine. The second valve decides whether the suction flow or the second partial flow flows directly towards an outlet opening or also flows through a third turbine.

[0025] According to the invention, it is preferred that the vacuum cleaner comprises at least one sensor for determining operating data of the vacuum cleaner. Furthermore, the vacuum cleaner can comprise a control device for evaluating the operating data of the vacuum cleaner determined by the at least one sensor, wherein the control device is configured to control the vacuum cleaner depending on the operating data determined by the at least one sensor. The operating data of the vacuum cleaner can, in particular, be negative pressure values ​​or ratios within the vacuum cleaner. In the context of the invention, however, it can also be preferred that motor parameters, filter parameters, particle or flow velocities and / or particle concentrations are measured, without being limited thereto. The operating data can preferably also be referred to as operating parameters.To determine the operating parameters, in particular the vacuum conditions in the vacuum cleaner, the vacuum cleaner can be equipped with suitable sensors. The sensors of the sensor system can, for example, be designed to determine a negative pressure in the vacuum cleaner's collecting container or in the various suction line sections, such as the first and second suction sections, the suction channel, and / or the first and second outlet sections. Furthermore, the vacuum cleaner can have a control device, wherein the control device is preferably configured to evaluate the negative pressure data determined by the sensors and, based on the determined negative pressure data, to set whether the vacuum cleaner operates in series or parallel operation.

[0026] According to the invention, it is preferred that the turbines of the vacuum cleaner are sequentially flowed through in series operation, while the turbines of the vacuum cleaner are preferably flowed through in parallel operation by partial suction flows of the suction flow in parallel. Due to the different operating modes of the vacuum cleaner, the proposed vacuum cleaner is advantageously capable of covering a particularly wide range of different suction power levels. This allows the vacuum cleaner and its operation to be optimally adapted to different applications, so that, for example, the energy consumption of the vacuum cleaner can be minimized. This is particularly advantageous when the vacuum cleaner is battery-operated, since in this case the range of the battery(ies) can be significantly increased or extended using the invention.

[0027] According to the invention, it is preferred that different vacuum ranges and / or volume flow ranges can be assigned to the different operating states of the suction device. The following operating states can be distinguished, for example:

[0028] 1 . First operating state: The first and second valves are open and the suction flow flows parallel through the first and second turbines (Figure 2),

[0029] 2. Second operating state: The first and second valves are closed and the suction flow flows successively through the second and third turbines (Figure 3),

[0030] 3. Third operating state: The first valve is open so that the suction flow flows through the first and second turbines, and the second valve is closed so that the partial flow that had flowed through the second turbine continues to flow through the third turbine (Figure 4).

[0031] According to the invention, it is preferred that the valves of the valve arrangement in the proposed suction device are switched such that the suction flow flows according to the aforementioned operating states. However, according to the invention, it can also be preferred that the suction motors are controlled, i.e. activated or deactivated, depending on the desired operating state, and that the valves adjust themselves essentially automatically according to the air flows developing in the suction device. This makes it possible to provide a particularly uncomplicated suction device without great control effort, and in which the risk of electronic malfunctions is also considerably reduced. For example, in the first operating state, the first and second turbines can be activated and the third turbine deactivated. This activation or deactivation can be carried out, for example, by the control device of the suction device.The suction flow then flows in parallel through the first and second turbines, but not through the third turbine, and the valves of the valve arrangement adapt to the air flows forming in the suction device in such a way that the first and second valves are open.

[0032] Preferably, the suction device can achieve different vacuum and flow rate ranges in its various operating modes. The different operating modes allow the suction or power curve of the proposed suction device to be optimally adapted to the respective application.

[0033] According to the invention, it is preferred that the first operating state of the vacuum cleaner is characterized in that a comparatively high volume flow Q and a comparatively low negative pressure are set in the vacuum cleaner, while in the second operating state of the vacuum cleaner comparatively low volume flows and high negative pressure values ​​are set. It has been shown that by differently controlling the suction motors in the proposed vacuum cleaner, the volume flows and the achievable negative pressure values ​​can be almost doubled. For example, the volume flow Q in the first operating state of the vacuum cleaner can be essentially twice as large as in a vacuum cleaner with only one suction motor, while the negative pressure is essentially the same or similar. Analogously, the negative pressure in the second operating state can be essentially approx.be twice as large as in a vacuum cleaner with only one suction motor, while the volume flow Q is essentially the same or similar. By combining the different operating modes in one vacuum cleaner, it is possible to combine and optimally utilize the best properties of the individual operating states of a vacuum cleaner with three turbines. As a result, the invention makes it possible to provide a vacuum cleaner with an optimized suction curve, which is characterized in particular by particularly high, achievable volume flows and negative pressure values. In addition, a considerable amount of energy can be saved when operating the proposed vacuum cleaner, particularly when maximum performance of the vacuum cleaner is not required. As a result, the provision of at least three suction motors can be useful, especially in battery-operated vacuum cleaners, in order to extend the range of the battery(ies), so that the battery(ies) can be used for a longer period of time.The batteries need to be charged less frequently. This saves valuable working time and makes work more efficient, for example on a construction site.

[0034] According to the invention, it is preferred that the turbines of the vacuum cleaner are comparatively small and have a comparatively low suction power. For example, the turbines can have approximately half or one-third of the nominal power typically used in vacuum cleaners. The use of comparatively small turbines, which can preferably be operated in a variable parallel or series connection, has the advantage that, in particular, those working areas characterized by a high or maximum volume flow and / or a high or maximum negative pressure can be expanded or better served. In order to ensure optimal operation of the vacuum cleaner with good suction power in these working areas, a very large, virtually oversized turbine would have to be used when using only one turbine, which in particular requires a lot of space.It has been shown that the use of three comparatively small turbines does not simply replace one large turbine, but rather offers the surprising advantages mentioned above, which experts had not anticipated. In particular, the use of the comparatively small turbines can ensure improved operation in frequently used operating ranges characterized by high flow rates and / or high negative pressure. Furthermore, small turbines are often more readily available and less expensive, thus simplifying procurement.

[0035] It is preferred within the meaning of the invention that essentially identical turbines are used within the proposed vacuum cleaner so that manufacturing and procurement advantages can be realized. However, it may also be preferred that different turbines are used in order to expand the suction curve. The valve arrangement can, for example, comprise flap, slide, or rotary valves. It is preferred within the meaning of the invention that the valve arrangement comprises different types of valves, such as flap and rotary valves. However, it may also be preferred for the valve arrangement to comprise exclusively flap valves, exclusively slide valves, or exclusively rotary valves.

[0036] Further advantages emerge from the following description of the figures. The figures, the description, and the claims contain numerous features in combination. Those skilled in the art will expediently consider the features individually and combine them into further meaningful combinations. In the figures, identical and similar components are numbered with the same reference numerals. They show:

[0037] Fig. 1 schematic view of a preferred embodiment of the vacuum cleaner with three turbines

[0038] Fig. 2 View of a preferred embodiment of the vacuum cleaner in a first operating state

[0039] Fig. 3 View of a preferred embodiment of the vacuum cleaner in a second operating state

[0040] Fig. 4 View of a preferred embodiment of the vacuum cleaner in a third operating state

[0041] Implementation examples and figure descriptions:

[0042] Figure 1 shows a preferred embodiment of the suction device 10. The suction device 10 can be designed as a vacuum cleaner or as an industrial vacuum cleaner and comprises three turbines T1, T2, T3 which generate an air or suction flow S. The suction device 10 can consist of an upper part (suction head) and a lower part, wherein the lower part of the suction device 10 can comprise a collection container for suction material, such as dust. An opening (not shown) can be provided in the suction device 10, which can be connected to a suction hose (not shown). The suction hose can be connected to a floor nozzle or a machine tool (not shown) so that the suction device 10 can be used to clean a floor or to vacuum up dust that is created when working with the machine tool. The dust is sucked into the suction device 10 with the help of the suction flow S, wherein a large portion of the dust can settle in the collection container.The suction flow S is further passed through a filter F within the suction device 10, whereby the suction flow S is further cleaned by the filter F.

[0043] The vacuum cleaner 10 shown in Figure 1 has a first valve V1 and a second valve V2, wherein the valves V1, V2 can form a valve arrangement V shown in Figure 2. In the exemplary embodiment of the invention shown in Figure 1, the first valve V1 is arranged between the first turbine T1 and the second turbine T2. If the suction flow S comes from the direction of the filter F, the suction flow S can split at the first branch 12. If the first valve V1 is open, the suction flow S can split into two partial flows, of which a first partial flow flows through the open first valve V1 and through the first turbine T1, while a second partial flow flows through the second turbine T2. In the sense of the invention, this preferably means that the first turbine T1 and the second turbine T2 are flowed through in parallel by the suction flow or the partial flows (parallel operation of the first turbine T1 and the second turbine T2).If both partial streams are then directed directly to outlet openings A1, A2, through which the partial streams can exit the suction device 10, this is referred to in the context of the present invention as the first operating state, which is illustrated in Figure 2. The first partial stream, which has flowed through the first turbine T1, can in particular be directed to a first outlet opening A1, where the first partial stream can exit the suction device. The second partial stream, which has flowed through the second turbine T2, can continue to flow toward a second branch 14.

[0044] In spatial proximity to this second branch, in the direction of the suction flow S, behind the second branch 14, the second valve V2 of the valve arrangement V is arranged. When the second valve V2 is closed, the suction flow S or the second partial flow can flow through the third turbine T3 and then leave the suction device 10 via a third outlet opening A3. If the first valve V1 is closed and the suction flow S coming from the filter F flows only through the second turbine T2 and not through the first turbine T1, this is referred to in the context of the present invention as the second operating state, which is illustrated in Figure 3.

[0045] When the second valve V2 is open, the suction flow S or the second partial flow can flow directly to a second outlet opening A2 and thus leave the suction device 10 without flowing through the third turbine T3. When the first valve V1 is open and the suction flow S coming from the filter F flows through both the second turbine T2 and the first turbine T1, this is referred to in the context of the present invention as the first operating state, which is illustrated in Figure 2.

[0046] The third operating state of the suction device 10 preferably occurs when the suction flow S flows through all three turbines T1, T2, T3. This third operating state is illustrated in Figure 4. Preferably, the first valve V1 is open and the second valve V2 is closed. After passing through the first turbine T1 or through the third turbine T3, the suction flow S is directed to the first outlet opening A1 and to the third outlet opening A3, through which the suction flow S can leave the suction device 10.

[0047] The suction device 10 can include at least one sensor 16 for determining operating data of the suction device 10. A possible position of the sensor 16 is schematically indicated in the figures. However, those skilled in the art will appreciate that sensors 16 can be arranged at various different locations within a suction device 10, so the position indicated in the figures is to be understood only as an example.

[0048] The figures also show outlet openings A through which the suction flow S can leave the suction device 10 after passing through the turbines T1, T2, T3. Figure 1 shows three outlet openings A, one outlet opening A each being assigned to a turbine T1, T2, T3. The respective suction flow S or partial suction flow that has flowed through a turbine T1, T2, T3 can then leave the suction device 10 via a corresponding outlet opening A. Figure 2 shows the first operating state of the suction device 10, in which the suction flow S leaves the suction device 10 through the first outlet opening A1 and through the second outlet opening A2, the first outlet opening A1 being assigned to the first turbine T1 and the second outlet opening A2 to the second turbine T2.Figure 3 illustrates the second operating state of the suction device 10, in which the preferably undivided suction flow S leaves the suction device 10 through the third outlet opening A3, whereby the third outlet opening A3 can be assigned to the third turbine T3. Figure 4 illustrates the third operating state of the suction device 10, in which the suction flow S leaves the suction device 10 through the first outlet opening A1 and through the third outlet opening A3.

[0049] List of reference symbols

[0050] 10 suction device

[0051] 12 first junction

[0052] 14 second junction

[0053] 16 Sensor

[0054] T1 first turbine

[0055] T2 second turbine

[0056] T3 third turbine

[0057] V valve arrangement

[0058] VI first valve

[0059] V2 second valve

[0060] S suction flow

[0061] F Filter

[0062] A Outlet openings

[0063] A1 first outlet opening

[0064] A2 second outlet opening

[0065] A3 third outlet opening

Claims

Patent claims 1 . Suction device (10) for sucking in dust by means of a suction flow (S), characterized in that the suction device (10) has a first turbine (T1), a second turbine (T2) and a third turbine (T3), wherein the suction device (10) is designed to allow the suction flow (S) to flow successively and / or in parallel through the turbines (T1, T2, T3).

2. Suction device (10) according to claim 1, characterized in that the suction device (10) has a valve arrangement (V), wherein the valve arrangement (V) is designed to allow the suction flow (S) to flow sequentially and / or in parallel through the turbines (T1, T2, T3).

3. Suction device (10) according to claim 2, characterized in that the valve arrangement (V) has a first valve (V1) and a second valve (V2), wherein the first valve (V1) is arranged between the first turbine (T1) and the second turbine (T2) and the second valve (V2) is arranged between the second turbine (T2) and the third turbine (T3).

4. Suction device (10) according to one of the preceding claims, characterized in that the first turbine (T1) and the second turbine (T2) are arranged parallel to one another.

5. Suction device (10) according to one of the preceding claims, characterized in that the second turbine (T2) and the third turbine (T3) are arranged one after the other in the direction of the suction flow (S).

6. Suction device (10) according to one of the preceding claims, characterized in that during a suction operation of the suction device (10) at least one of the turbines (T1, T2, T3) is flowed through by the suction flow (S).

7. Suction device (10) according to one of claims 2 to 6, characterized in that a negative pressure within the suction device (10) is maximum when the suction flow (S) flows successively through the second turbine (T2) and through the third turbine (T3).

8. Suction device (10) according to one of claims 2 to 7, characterized in that a negative pressure within the suction device (10) is maximum when the first valve (V1) and the second valve (V2) are closed.

9. Suction device (10) according to one of claims 2 to 8, characterized in that all three turbines (T1, T2, T3) are flowed through by the suction flow (S) when the first valve (V1) is open and the second valve (V2) is closed.

10. Suction device (10) according to one of the preceding claims, characterized in that the first valve (V1) and / or the second valve (V2) is / are designed as a check valve.

11. Suction device (10) according to one of claims 2 to 10, characterized in that the first valve (V1) is arranged in spatial proximity to a first branch (12).

12. Suction device (10) according to one of claims 2 to 11, characterized in that the second valve (V2) is arranged in spatial proximity to a second branch (14).

13. Suction device (10) according to one of the preceding claims, characterized in that the suction device (10) comprises at least one sensor (16) for determining operating data of the vacuum cleaner.

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