CN111067410B

CN111067410B - Suction cleaning device with sensor for detecting charged particles

Info

Publication number: CN111067410B
Application number: CN201910976685.6A
Authority: CN
Inventors: R.欧特曼; G.伊森伯格; S.萨特沃尔; S.默勒
Original assignee: Vorwerk and Co Interholding GmbH
Current assignee: Vorwerk and Co Interholding GmbH
Priority date: 2018-10-19
Filing date: 2019-10-15
Publication date: 2023-03-14
Anticipated expiration: 2039-10-15
Also published as: DE102018126107A1; CN111067410A

Abstract

The invention relates to a suction cleaning device (1) having a suction opening (2), a fan (3) and a flow channel (4) providing a flow connection between the suction opening (2) and the fan (3), wherein the flow channel (4) has a plurality of sensors (5, 6, 7, 8, 9, 10, 11, 12) for detecting charged particles flowing through the flow channel (4). In order to be able to evaluate particles flowing through the flow channel (4) with respect to a plurality of parameters, it is proposed that the sensors (5, 6, 7, 8, 9, 10, 11, 12) are arranged in and/or after a bending region (13) of the flow channel (4) with respect to a main flow direction of the particles, in which bending region the main flow direction of the particles is changed due to the bending, such that a portion of the particles is selectively deflected, depending on their mass and/or size, into a detection region of at least one sensor (5, 6, 7, 8, 9, 10, 11, 12).

Description

Suction cleaning device with sensor for detecting charged particles

Technical Field

The invention relates to a suction cleaning device having a suction opening, a fan and a flow channel providing a flow connection between the suction opening and the fan, wherein the flow channel has a plurality of sensors for detecting charged particles flowing through the flow channel, wherein the sensors are arranged in and/or behind a curved region of the flow channel with respect to a main flow direction of the particles, in which region the main flow direction of the particles changes due to the curvature, such that a portion of the particles is selectively deflected into a detection region of at least one sensor as a function of their mass and/or size, wherein the sensors are arranged in succession in the circumferential direction of the flow channel and in the axial direction of the flow channel.

The invention further relates to a method for detecting charged particles flowing through a flow channel of a suction cleaning device by means of a plurality of sensors.

Background

Suction cleaning devices of the aforementioned type are sufficiently known in the prior art. The suction cleaning device can be, for example, a hand-held suction cleaning device or a self-propelled suction cleaning device, in particular a conventional household vacuum cleaner.

It is known to detect charged particles within a flow channel in order to obtain information about the particles being pumped.

Patent document DE 10 2008 026 884 B4 relates, for example, to a cleaning device having a sensor for generating a measurement signal related to the concentration and/or quantity of particles inhaled.

Furthermore, in the prior art, for example, from the publications US 4 363 244A and DE 39 07 387 A1, a method is known for measuring the size and/or the charge and/or the speed and/or the concentration of particles by means of one or more ring sensors, which detect the charge induced on the respective sensor for each particle.

Disclosure of Invention

Starting from the prior art described above, the object of the present invention is to provide a suction cleaning device or a related method with an alternative sensor arrangement, in which in particular further parameters of the charged particles can be determined.

In order to solve the aforementioned technical problem, it is proposed that the sensors are inductive sensors and that the flow channel has an even number of at least four sensors in a cross section oriented in an axial direction perpendicular to the flow channel, wherein the sensors are arranged equidistant from one another and/or have a detection region of the same size and/or define the same angular range of the flow channel in the circumferential direction.

According to the invention, the sensors are arranged one behind the other in the circumferential direction of the flow channel and/or in the axial direction of the flow channel. The arrangement of the plurality of sensors in the circumferential direction of the flow channel means that the sensors are arranged in different circumferential sections of the flow channel in the same cross section of the flow channel, i.e. preferably diametrically opposite to the longitudinal axis of the flow channel. By this design it can be determined whether the particles can follow this curvature in the curved region of the flow channel or follow a curved trajectory with a relatively larger radius and are therefore offset outwards with respect to the center of curvature of the flow channel. In addition or alternatively, the exact place where the particles flow or impinge on the wall area of the flow channel can be detected by a plurality of sensors arranged in succession in the axial direction of the flow channel. From this, the mass of the particles can be deduced again, which determines the deflection radius of the respective particle. Particularly heavy particles impinge on the wall side facing away from the center of curvature of the curved region of the flow channel, wherein the impact point is closer to the apex of the curved region if the particles are heavier. In very heavy particles with a correspondingly large moment of inertia, the radius of deflection is so large that the point of impact on the wall of the current channel approaches the apex of the bend. Relatively lighter particles may instead follow the radius of the curved region better, so that these particles, if any, impinge further away from the apex of the curved region onto the inner wall of the suction channel opposite the centre of curvature. It is appropriate for the sensors arranged one behind the other in the circumferential direction and the sensors arranged one behind the other in the axial direction of the flow channel that the particle mass and/or size can be determined more accurately if more sensors are used.

The sensor is an inductive sensor. Inductive sensors are ideal for detecting charged particles in the suction air stream. The inductive effect on the conductive detection area of the inductive sensor is measured here, which is proportional to the charge of the particles. Although in principle other sensor types, for example sensor types which are designed according to the type of ion flow sensor used in internal combustion engines, can also be considered as sensors for detecting charged particles, the use of inductive sensors is recommended because they enable optimum measurement accuracy, in particular in the case of unevenly concentrated suction objects from a room area. Since the particles that are usually present in house dust are originally charged, no further measures, such as applying an electric charge to the suction air flow, are necessary in order to be able to detect the particles by means of inductive sensors.

Furthermore, the flow channel has an even number of at least four sensors in a cross section oriented perpendicular to the axial direction of the flow channel. The sensors can in particular be arranged equidistantly to one another and/or have the same size of detection region and/or define the flow channel with the same angular extent in the circumferential direction of the flow channel. In a flow channel which is assumed to be circular in cross section, two sensors can be offset from one another by a spacing of 180 °, or four sensors can be offset from one another by a spacing of 90 °, wherein the sensors preferably cover as large an angular section as possible, but are not in conductive contact with one another. Other size ratios between the sensors may be advantageous if the flow channel is shaped non-circularly with respect to the cross section, but for example elliptically or freeform. Furthermore, the sensors may differ in the non-circular cross-section, in particular also in their mutual spacing and/or their detection region size. Here, an asymmetrical arrangement and design of the sensors or their detection regions is also possible. Furthermore, more than four sensors can also be arranged in the cross section of the flow channel, thereby improving the accuracy of the detection result if necessary.

The sensor is arranged in or directly after the curved region of the flow channel and not only in the straight part of the flow channel, in which the main flow direction of the particles does not change. By means of this embodiment, further parameters of the particles can be measured, which are dependent on the size and/or the inertia of the particles. By using the physical effect by arranging the sensor in a curved region of the flow channel, particles of different sizes and/or weights in the suction air flow are deflected differently strongly. Thereby, the particles in the flow channel can be classified, for example, to distinguish between fine dust and coarse material. The position of the particle in the bending region or in which region of the flow channel the particle is located after can be determined by a plurality of sensors for detecting particles. Thus, the position of the particle can be accurately determined by comparing the signal strength of the sensors. It is true here that the signal of the sensor is stronger if the particle is closer to the respective sensor. The position of the particles in the flow channel can thus be deduced. By shifting in the curved region of the flow channel, if necessary changing the radial position of the particles in the flow channel, the size and/or mass of the particles can be deduced. In the curved region of the flow channel, forces are exerted on the particles by the air flow to the fan, which external forces are proportional to the mass of the particles, so that the particles are turned into a circular trajectory according to the mass. Lighter particles have a smaller moment of inertia than heavier particles, so that the lighter particles can follow a curved course and, after bending, lie substantially at the same radial position in the flow channel as before. Conversely, particles of large mass are carriers, i.e. have a greater moment of inertia. Thereby, the particles are subjected to forces by the air flow, which forces are not sufficient to force the particles to follow the radius of curvature of the flow channel. The particles thus reach a circular trajectory with a larger radius and are deflected in the direction of the wall of the flow channel and may even impinge there on the wall. Thus, overall, a radial offset of the heavier particles in the flow channel is achieved, which can be detected by the corresponding sensor. In this case, if the charged particles flow through the sensor in closer proximity, the amplitude of the corresponding detection signal is higher and the corresponding signal maximum is narrower. Accordingly, the detection signal in sensors further away from the particles is lower and wider. Furthermore, the force acting on the particles in the curved region of the flow channel is proportional to the cross-sectional area of the particles on which the suction air flow acts, so that particles having a larger active area, i.e. a larger cross-sectional area, can follow the curved course of the flow channel more easily than relatively smaller particles having a smaller cross-sectional area. Larger particles can therefore follow the course of the bending zone more easily than relatively smaller particles and, after bending in the radial direction of the flow channel, lie approximately at the same position in the flow channel. Relatively smaller particles arrive on a circular trajectory with a larger radius and can therefore be deflected in the direction of the sensor or sensors and are therefore detected by the sensors.

The sensor can preferably be designed to correspond to the wall shape of the flow channel. The shape of the sensor may thus follow the shape of the flow channel in axial and/or circumferential direction. The suction channel can have, for example, an oval, angular, polygonal or even free-formed cross-sectional shape. The sensor may have a conductive film or plate, which forms a conductive detection area of the sensor. The film or plate can in particular be made of an electrically conductive plastic. This enables a simple integration of the sensor function into the flow channel. The membrane or plate may be fixed to the inner wall of the flow channel. Alternatively, the sensor may also be embedded in the electrically insulating material of the flow channel. The sensor, in particular its electrically conductive detection region, is located at least in some regions in the electrically insulating material of the flow channel. By embedding the sensor at least partially in the electrically insulating material of the flow channel, a more flow-friendly design of the flow channel is obtained if necessary. Furthermore, the sensor can be encapsulated by the material of the flow channel, in particular by plastic injection molding, or arranged between two electrically insulating circumferential layers of the flow channel. The flow passage may have a plurality of different circumferential layers forming different layers in a radial direction of the flow passage. First, a shielding layer against electrical and/or magnetic interference fields can be provided, for example, on the outside. The shield may be an insulating layer of aluminum or copper or the like. The use of thin sheet material is particularly suitable. In the radially inward viewing direction, for example, a non-conductive plastic layer may be present behind. This is followed by an electrically conductive detection region of the sensor and optionally also by a further electrically non-conductive plastic layer which protects the electrically conductive detection region of the sensor against contamination by the suction air flow guided in the flow channel. The electrically insulating plastic layer can preferably form an electrically insulating intermediate region for adjacent sensors. Furthermore, the sensor can be constructed with one or two plastic layers, which also serve as a two-component part. Alternatively, the circumferential layers can also be mechanically connected to one another, for example by gluing or welding. The sensor can also form part of the inner wall of the suction channel. The material of the flow channel is thereby spaced apart side by side sensors in the circumferential and/or axial direction of the flow channel.

It is proposed that the sensor is equipped with an evaluation device which is set up to determine the size and/or mass of the particles and/or the particle position and/or the particle distribution in the cross section of the flow channel from the detection signal of the sensor. Particles in a cross-section having a larger size, which is subjected to the suction air flow, are subjected to a larger force by the suction air flow than relatively smaller particles. Thus, larger particles, on which the suction air flow in the flow channel acts, can more easily follow the course of the curved region, and the delimitations behind the curved region with reference to the flow channel are located in the same or a similar position radially in front of the curved region. Relatively smaller particles with a smaller cross-sectional area are subjected to less force, which is not sufficient to deflect the particles in correspondence with the radius of curvature of the bending zone. Thereby, the particles reach a circular trajectory with a relatively larger radius and may even impinge on the walls of the flow channel. Thus, smaller particles are shifted in the direction of the sides of the flow channel that are further away from the center of curvature of the curved region. The sensor arranged there can thus detect the presence of particles in the detection area of the sensor. The particle mass can likewise be determined by the deflection of the particles in the bending region, lighter particles having a smaller inertia than the particles with a greater mass and therefore being able to follow the bending course better. The particles of greater mass are correspondingly offset from the circular trajectory of the channel curve and follow a circular trajectory with a greater radius. As a result, the particles of greater mass strike the wall pointing outwards in the direction of the curvature of the flow channel, where they can be detected by the sensor. The detection area of the associated sensor is here closer to the apex of the bending area if the detected particles are heavier. By arranging a plurality of sensors which are continuous in the axial direction of the flow channel, the actual mass of the detected particles can thus be reliably determined. Furthermore, the particle position or the particle distribution of the particles in the flow channel can also be determined by comparing the signal amplitudes of the different sensors. In regions in which the sensor detects no signal or a signal with relatively only a small signal amplitude and/or a broad signal maximum, the region of the flow channel in which a particularly strong signal (i.e. a higher signal amplitude and/or a concentrated signal maximum) occurs has a greater number of particles than in such regions.

Furthermore, it can be provided that the measurement is performed by means of sensors which are arranged offset to one another in the axial direction of the flow channel. The sensors arranged in succession in the axial direction can be arranged in the flow channel either in the same radial direction or in different radial directions.

It is furthermore proposed that the flow channel has a quiet region for reducing turbulence of the particle flow in the main flow direction of the particles before the bend region. The calming region can in particular have a change in the diameter of the flow channel and/or have elements, such as lamellae, which deflect the flow. Furthermore, it is also possible to provide a calming zone only by a certain minimum length of the flow channel, minimizing turbulence of the particle flow. Therefore, a flat section is present in the flow channel before the sensor device, which reduces the swirling or swirling motion of the contamination particles, which also superimposes a laminar flow of the particles. As a result, the laminar flow of the particles can dominate, ideally no measurable swirling/swirling flow is present anymore. The calming zone is the part of the flow channel through which the particles flow and reduces the swirling or swirling motion of the particles in the course of the flow channel. The reduction in turbulence enables overall a higher measurement accuracy of the sensor.

In addition to the aforementioned suction cleaning device, the invention also proposes a method for detecting charged particles flowing through a flow channel of a suction cleaning device by means of a plurality of sensors, wherein the particles are detected by means of sensors arranged in and/or after a curved region of the flow channel in the main flow direction of the particles, wherein a portion of the particles is offset in the curved region of the flow channel from the hitherto main flow direction, so that the particles selectively enter the detection region of at least one sensor as a function of their size and/or mass. Such a method can be carried out with a suction cleaning device according to the invention, for which reason the features and advantages previously proposed in connection with suction cleaning devices accordingly also result.

In particular, it can be provided that a portion of the particles is offset in the curved region of the flow channel from the previous main flow direction, so that the particles selectively enter the detection region of the at least one sensor depending on their size and/or mass. The detection signals of the one or more sensors are subsequently evaluated by an evaluation device in order to determine the size and/or mass and/or the particle position of the particles and/or the particle distribution in one or more cross sections of the flow channel.

Drawings

The present invention is illustrated in detail below with reference to examples. In the drawings:

figure 1 shows a suction cleaning device according to the present invention;

FIG. 2 shows a suction nozzle of a suction cleaning device having a sensor for detecting charged particles;

FIG. 3 shows a nozzle according to another embodiment;

FIG. 4 shows a flow channel having a sensor for detecting charged particles according to another embodiment;

FIG. 5 shows a flow channel having a sensor for detecting charged particles according to another embodiment;

fig. 6 shows a flow channel according to another embodiment with a sensor for detecting charged particles.

Detailed Description

Fig. 1 shows an exemplary suction cleaning device 1, which is designed here as a hand-held device with a base device 19 and a suction nozzle 17. The suction nozzle 17 is detachably arranged on the base device 19 according to the type of the accessory device. The base device 19 has a handle 21, which can be telescopic, for example, so that a user of the suction cleaning device 1 can adapt the length of the handle 21 to his height. Furthermore, a handle 22 is arranged on the lever 21, on which a user can guide the suction cleaning device 1, i.e. move it over the surface to be cleaned, during normal operating operation. During the working operation, the user guides the suction cleaning device 1 over the surface to be cleaned, usually in opposite directions of movement to one another. Here, the user alternately pushes and pulls the mobile suction cleaning device 1. Furthermore, a switch 23 is arranged, for example, on the handle 22, for example, for switching on and off a motor 26 that drives the fan 3.

The suction nozzle 17 has a housing 18 with a connection area 25, to which a base device 19 of the suction cleaning device 1 is connected. The suction nozzles 17 have wheels 20 for rolling the suction nozzles 17 over the surface to be cleaned during operational operation. A flow channel 4 is guided inside the housing 18, which flow channel provides a flow connection between the suction opening 2 of the suction nozzle 17 and the fan 3 of the suction cleaning device 1. The suction opening 2 is oriented toward the surface to be cleaned in the usual working operation of the suction cleaning device 1. In the region of the suction opening 2, the suction nozzle 17 furthermore has cleaning elements 24, which are configured here, for example, in the form of a bristle roller rotating about a substantially horizontal axis of rotation, which bristle roller carries a plurality of bristle elements. The cleaning elements 24 may be motor driven.

Fig. 2 shows a suction nozzle 17 according to a possible embodiment. The suction nozzle 17 has a total of four

sensors

5, 6, 7, 8 assigned to the flow channel 4. The sensors 5 to 8 are arranged in a curved region 13 of the flow channel 4. The sensors 5 to 8 are equipped with an evaluation device 14, which is provided to evaluate the signals detected by the sensors 5 to 8. The sensors 5 to 8 extend in strips in the axial direction a of the flow channel 4, wherein the sensors cover the apex of the bending region 13 and a certain length on both sides of the apex. The sensors 5 to 7 are spaced apart from one another in the circumferential direction u of the flow channel 4.

The sensors 5 to 8 are designed here, for example, as inductive sensors, which can measure the charged particles flowing through the flow channel 4. Here, if the charged particles are closer to the respective sensors 5 to 8, the detection signal at the sensors 5 to 8 is higher. The higher the signal amplitude of the detection signal, and the narrower the corresponding peak in the amplitude-time diagram, if the charged particles are closer together. The sensors 5 to 8 are designed as elongate strips which can be integrated into the material of the wall of the flow channel 4 or can be applied to the wall of the flow channel 4 from the inside or from the outside. An insulating material is present between the sensors 5 to 8, so that the detection regions of the sensors 5 to 8 are separated from each other.

In the scope of this exemplary embodiment, the invention is implemented in such a way that, during operation of the suction cleaning device 1, particles are sucked into the flow channel 4 via the suction opening 2 of the suction nozzle 17. Here, the particles also flow through the curved region 13 of the flow channel 4, where they are forced by the suction of the fan 3 either strongly or weakly on a circular path and can therefore follow the course of the curved region 13 or are not forced on a circular path and therefore cannot follow the course of the curved region 13. The deflection of the charged particles in the bending zone 13 is here related to the size and mass of the particles. The force exerted on the particles by suction is proportional to the cross-sectional area. Particles that are relatively lighter and/or have a larger cross-sectional area have a smaller moment of inertia or are drawn by suction to a greater force. The particles can thus follow the course of the bending zone 13 and lie relatively speaking at substantially the same radial position in the flow channel 4 after the bending zone 13. The particles of relatively greater mass have a greater moment of inertia and the force (which the suction of the fan 3 exerts on the particles) is therefore insufficient to force the particles on the radius of curvature of the curved region 13. As are particles having a very small cross-sectional area. The suction force acts on these particles having a small cross-sectional area relative to the larger particles, so that these particles cannot be forced on the radius of curvature of the curved region 13 either. The particles of large mass or particles with a relatively small cross-sectional area therefore flow along a circular trajectory with a radius larger than the radius of curvature of the curved region 13 and, if appropriate, even impinge on the inner wall of the flow channel 4, here the inner wall of the flow channel 4 in the region of the sensor 7. The particles thus move radially outwards away from the center of curvature of the curved region 13, which can then be detected by the sensors 5 to 8. From the magnitude of the detection signal or the signal amplitude of the sensor measured by one or more of the sensors 5 to 8, the particle mass, particle size or particle position or the distribution of the particles in the flow channel 4 can be deduced. The evaluation device 14 compares the signal amplitudes of the sensors 5 to 8 with one another for this purpose and can thus determine where the greatest number of particles is present.

Fig. 3 shows a further embodiment of a suction nozzle 17 according to the invention with a plurality of sensors 5 to 12, which are arranged in two groups of four sensors 5 to 8 or 9 to 12, respectively, in the flow channel 4. The sensors 5 to 8 are arranged as shown in fig. 2 in succession in the circumferential direction of the flow channel 4 in the curved region 13 of the flow channel 4. Furthermore, in the main flow direction of the charged particles, four further sensors 9 to 12 are located in the straight part of the flow channel 4 before the bending region 13. The sensors 9 to 12 are used to determine the distribution of particles in a straight flow channel section which is developed by the detection region of the sensors 9 to 12. It is not necessary to arrange the sensors 9 to 12 in the curved region 13 of the flow channel 4 in order to determine the particle distribution. Conversely, the radial particle distribution can be inferred from the amplitude ratio of the signals detected by the sensors 9 to 12. The grouping of the sensors 5 to 8 associated with the bending region 13 operates as explained above with reference to fig. 2. All sensors 5 to 12 are connected in communication with an evaluation device 14, which can determine the mass and/or size of the particles and/or the particle position and/or the particle distribution in the flow channel 4 accordingly.

Fig. 4 shows a further embodiment of the flow channel 4, which has a total of eight sensors 5 to 12 arranged in the circumferential direction u of the flow channel 4. The sensors 5 to 12 are divided into two groups having sensors 5 to 8 and sensors 9 to 12. The sensors 5 to 12 are again assigned to the bending region 13 of the flow channel 4, wherein the sensors 9 to 12 are arranged axially behind the sensors 5 to 8 in the flow channel 4, so that particles flowing through the flow channel 4 from left to right in the illustration first pass through the cross section braced or clamped by the sensors 5 to 8 and subsequently through the cross section braced or clamped by the sensors 9 to 12. This configuration enables an optimal determination of the particle mass and particle size, since particles of different weight or different size are offset from the curved course of the flow channel 4 by different strengths on the basis of their inertia or cross-sectional area. Thus, not only a deviation of the particles in a direction away from the center of curvature, but more so where the particles impinge on the side of the flow channel 4 facing away from the center of curvature, i.e. on the

sensors

7 and 11. If a particle, for example, is deflected to the sensor 7, it has a greater mass than a particle impinging on the sensor 11, which sensor 11 is arranged behind the sensor 7 in the axial direction a of the flow channel 4.

Fig. 5 shows an embodiment of the flow channel 4 with two strip-shaped

sensors

5, 6, which are arranged offset from one another with respect to the axial direction a of the flow channel 4, so that additionally the flow velocity of the particles flowing through the flow channel 4 can be determined. Particles flowing through the flow channel 4 from left to right in the drawing arrive first at the region of the sensor 5 at a first point in time and subsequently in time at the region of the sensor 6 at a second point in time, so that the flow velocity can be determined by the time difference and the known axial travel between the

sensors

5 and 6. The stroke is calculated here between the cross section at the beginning of sensor 5 and the cross section at the beginning of sensor 6. The time difference and the travel length difference, and thus the particle velocity, can also be calculated when leaving the section of the flow channel 4 that is expanded by the two

sensors

5, 6.

Fig. 6 finally shows an embodiment in which a quiet zone 15 with lamellae 16 is formed in the flow channel 4. The calming zone 15 serves to eliminate the flow portion of the turbulence in the flow channel 4. The lamellae 16 projecting into the flow channel 4 reduce the helical or swirling motion of the particles so that the sheet-like part of the flow is predominant. Alternatively, the flat region 16 can also be formed by other flow deflection elements. It is furthermore possible to increase the laminar flow portion by a change in the cross section of the flow channel 4 or by a defined length of the flow channel 4 before the bending region 13, which is sufficient for the flow to settle before reaching the bending region 13. This results in overall greater measurement accuracy of the subsequent sensors 5 to 8.

Although the embodiments herein show an assembly with four sensors 5 to 8 or 9 to 12, respectively, in relation to the circumferential direction u of the flow channel 4, it is to be understood that further sensors may also be arranged in the circumferential direction u or in the axial direction a of the flow channel 4. It is for example possible to surround the cross section of the flow channel 4 with two, four, six, eight, ten or more sensors. An odd number of sensors is also possible here, wherein it is to be noted with respect to the bending region 13 that the sensors are arranged on an inner wall which is spaced further from the center of curvature of the bending region 13, i.e. in a position in which particularly heavy or particularly small particles are offset radially outward from the bending trajectory of the bending region 13.

List of reference numerals

1. Suction cleaning device

2. Suction opening

3. Fan with cooling device

4. Flow channel

5. Sensor with a sensor element

6. Sensor with a sensor element

7. Sensor with a sensor element

8. Sensor with a sensor element

9. Sensor with a sensor element

10. Sensor with a sensor element

11. Sensor with a sensor element

12. Sensor with a sensor element

13. Bending zone

14. Evaluation device

15. Quiet area

16. Sheet

17. Suction nozzle

18. Shell body

19. Basic equipment

20. Wheel

21. Handle bar

22. Handle bar

23. Switch with a switch body

24. Cleaning element

25. Connection area

26. Motor with a stator having a stator core

u circumference direction

a axial direction

Claims

1. A suction cleaning device (1) having a suction opening (2), a fan (3) and a flow channel (4) providing a flow connection between the suction opening (2) and the fan (3), wherein the flow channel (4) has a plurality of sensors (5, 6, 7, 8, 9, 10, 11, 12) for detecting charged particles flowing through the flow channel (4), wherein the sensors (5, 6, 7, 8, 9, 10, 11, 12) are arranged in a curved region (13) of the flow channel (4) relative to a main flow direction of the particles, in which the main flow direction of the particles changes due to the curvature, such that a portion of the particles are selectively deflected depending on their mass and/or size into a detection region of at least one sensor (5, 6, 7, 8, 9, 10, 11, 12), wherein the sensors (5, 6, 7, 8, 9, 10, 11, 12) are arranged in the circumferential direction (u) of the flow channel (4) and the axial direction (4) of the flow channel (4) is at least the number of sensors (5, 6, 7, 8, 9, 10, 11, 12) which is at least four sensors (5, 6, 7, 8, 9, 12) are oriented in the axial direction of the flow channel (4) in the flow channel (4) and/or after the flow channel (4) is characterized in that the sensors (5, 6, 7, 8, 10, 12) are arranged in that the flow channel (4) are arranged in the flow channel (4) in the axial direction, the at least four sensors are arranged in different circumferential sections of the flow channel (4), wherein the sensors (5, 6, 7, 8, 9, 10, 11, 12) are arranged equidistantly to one another and/or have the same-sized detection regions and/or define the same angular extent of the flow channel (4) in the circumferential direction (u), and wherein the sensors (5, 6, 7, 8, 9, 10, 11, 12) are equipped with an evaluation device (14) which is designed to determine the spatial particle distribution of the flow channel (4) in a cross section oriented perpendicular to the axial direction (a) of the flow channel (4) as a function of the detection signals of a plurality of sensors (5, 6, 7, 8, 9, 10, 11, 12).

2. The suction cleaning device (1) according to claim 1, characterized in that the sensors (5, 6, 7, 8, 9, 10, 11, 12) are provided with an evaluation device (14) which is set up for determining the size and/or mass and/or particle position of particles within the cross section of the flow channel (4) from the detection signals of the sensors (5, 6, 7, 8, 9, 10, 11, 12).

3. The suction cleaning device (1) according to claim 1 or 2, characterized in that the flow channel (4) has a calm region (15) for reducing turbulence of the particle flow before the curved region (13) in the main flow direction of the particles.

4. The suction cleaning device (1) according to claim 3, characterized in that the calming zone (15) has lamellae (16) which change the diameter of the flow channel (4) and/or deflect the flow.

5. A method of detecting charged particles flowing through a flow channel (4) of a suction cleaning device (1) by means of a plurality of sensors (5, 6, 7, 8, 9, 10, 11, 12), characterized in that the suction cleaning device is constructed in accordance with any one of claims 1 to 4.