WO2017036754A1

WO2017036754A1 - Suction device and method for operating a suction device

Info

Publication number: WO2017036754A1
Application number: PCT/EP2016/069028
Authority: WO
Inventors: Michael Schechterle; Henning Hayn; Markus Dünne; Felix BENSING; Christian Roßkopf; Bernhard Feuchter
Original assignee: Alfred Kärcher Gmbh & Co. Kg
Priority date: 2015-09-02
Filing date: 2016-08-10
Publication date: 2017-03-09
Also published as: DE102015114668A1

Abstract

The invention relates to a suction device comprising a fan device 40 with a drive motor 44 for generating a suction current, and a filter device 46, wherein an acceleration sensor device 64 and/or a microphone device 64' is associated with said fan device 40, and an evaluation device 88 is provided which determines a rotational speed of an impeller wheel of said fan device 40 from measurement data of the acceleration sensor device 64 and/or the microphone device 64'.

Description

Suction device and method of operation

The invention relates to a suction device, comprising a blower device with a drive motor for generating a suction flow, and a filter device.

The invention further relates to a method for operating a suction device, which comprises a blower device with a drive motor and a filter device.

From DE 10 2011 050 260 AI a method for evaluating a particle signal in a vacuum cleaner with an electric motor driven suction fan and / or with a suction attachment, which includes a motor-driven brush roller known. It is at least one

Control device for influencing the speed or power of the suction fan and / or the bristle roller provided. Furthermore, a sensor for generating the particle signal is provided, which depends on the number of dust particles sucked up, the control device influencing the rotational speed of the power of the suction fan and / or the bristle roller as a function of the particle signal processed by means of an evaluation circuit. From EP 2 548 491 AI a vacuum cleaner with a drive unit and a drive unit control is known, wherein the drive unit generates a volume flow and a negative pressure during operation of the vacuum cleaner due to supplied electrical power. The vacuum cleaner has means for detecting a measure of the volume flow generated in operation and means for detecting a measure of the negative pressure generated during operation. The power plant controller has means for reducing the electric power consumption of the power plant depending on the result of the comparison of a calculation amount with a design limit. From DE 10 2010 031 572 AI a device for controlling the performance of a blower motor for a vacuum cleaner, which has a arranged in a dust chamber replaceable filter bag, known. A pressure sensor system is provided for detecting a differential pressure between a first region located in the suction flow direction in front of the replaceable filter bag and a second region lying in the suction flow direction downstream of the replaceable filter bag. A control unit provides for the blower motor

Power depending on the detected differential pressure.

From DE 198 30 737 C2, a method for controlling a suction device with a turbine is known, wherein the rotational speed of the turbine is measured in normal operation and is closed from the speed based on stored characteristics on the other operating data.

From DE 38 53 409 T2 or EP 0 320 878 Bl a method for the operation of a vacuum cleaner with at least one electric blower and a speed control unit for the operation of the vacuum cleaner with different speeds is known, wherein in the speed control unit initially a number of different operating control rules for electric blower is stored, a load current value of the electric blower continuously detected and the nature of a surface to be cleaned from the load current value during cleaning is estimated. From DE 10 2012 102 631 AI is a method for setting a

Suction system is known in which a Saugfluidstrom is varied in a flow path and at a corresponding Saugfluidstrom a the operation of an electric motor characterizing parameter is measured. It becomes a flow characteristic or a flow characteristic field, which or a relationship between the Saugfluidstrom and the

Parameter represents, set up and the flow characteristic or the

Flow characteristic field is stored in a control device. From DE 10 2005 045 544 AI a method for generating a signal for changing the filter bag of a vacuum cleaner is known.

From DE 43 04 511 AI a vacuum cleaner nozzle is arranged with a housing arranged in a bottom open, provided with bristles and driven by an electric motor brush roller, wherein the rotational speed of the brush roller in dependence of different suction parameters can be controlled. From DE 10 2011 015 575 AI, a suction device is known, which has a cleaning device for cleaning a filter lining which is formed on a filter during filtering of particles from a suction flow from the filter in the context of a cleaning process. There is at least one cleaning sensor for generating a cleaning sensor signal as a function of a function of the cleaning device. A control device is provided for controlling a suction motor in response to the cleaning sensor signal.

From EP 1 340 446 AI a filter cleaning device is known.

From DE 10 2008 038 893 AI a method for determining the degree of filling of a collecting device arranged in a vacuum cleaner is known.

From EP 1 443 636 AI a method for determining the speed of a motor is known in which the output from a rotating motor

Noise is used as a measure of the speed. The sound waves generated by a rotating part of the rotating motor are detected by at least one microphone and then the engine speed is determined on the basis of the frequency of the detected sound waves.

The invention has for its object to provide a suction device of the type mentioned, in which a simple way operating data the blower device can be determined and determined in particular contactless.

This object is achieved according to the invention in the suction device of the type mentioned above in that the blower device is associated with an acceleration sensor device and / or a microphone device, and an evaluation device is provided which determines a rotational speed of an impeller of the blower device from measured data of the acceleration sensor device and / or the microphone device determined.

During operation of the blower device results in an imbalance of a drive shaft of the drive motor and / or an impeller, which is driven by the drive motor. This imbalance is a periodic signal with the period of the rotational speed of the impeller or the drive motor when no transmission is provided between a shaft of the drive motor and the impeller. By an acceleration sensor device with one or more acceleration sensors, this periodic imbalance can be detected. By a microphone device with one or more microphones, the corresponding sound pressure changes can be detected. By means of a microphone device, a rotational frequency of the drive motor (indirectly) can be determined via the generated audio frequency: The total imbalance of a blower system introduces structure-borne sound into housing parts via bearing points. The housing parts emit airborne sound at a frequency which corresponds to the rotational frequency of the drive motor. Alternatively, the orbit frequency can be determined from a leaf repetition rate of impeller scroll. By non-contact past static components or flow inhomogeneities tones are generated, which have the n-fold frequency of the rotational frequency of the drive motor. The number of sheets of the impeller is n. From the measured data of the acceleration sensor device or the microphone device, the current rotational speed of the impeller can then be determined at least approximately via the evaluation device. The acceleration sensor device or the microphone device can be arranged in such a way that the measurement data relating to the blower device are determined without contact. In particular, the acceleration sensor device and the additional microphone device can be arranged dust-proof on the suction device.

The acceleration sensor device or the microphone device can also determine further information. For example, the position of the suction device or a movement of the suction device can be detected via the acceleration sensor device. For example, in practice often occurs the case that a vacuum cleaner is placed on a raised surface and falls from the pad and then hangs only on an inserted power cord. Such an operation can be detected via an acceleration sensor device and a warning signal for an operator can be emitted.

For example, it is also possible to arrange at least one sound-generating element (vibration element) on a separator device of the suction device, which generates sound detectable by the microphone device when it is exposed to a suction flow. If an air column can form between such a vibrating element and received dirt, then in principle the sound output of such a vibrating element is dependent on the height of the air column. The height of the air column in turn changes with the degree of filling of the separator. By means of the microphone device, for example, a degree of filling of a separator device (in particular of a receiving space in the suction device or a receiving container arranged in the receiving chamber) can also be determined without contact. The acceleration sensor device and / or the microphone device can be arranged on the blower device. It is particularly advantageous if it is arranged at a distance from the blower device and, in particular, the measurement data is determined without contact with respect to the blower device. In the case of the arrangement on the blower device, under certain circumstances the acceleration may be too high or the sound pressure may be too high. In a spaced arrangement, the acceleration sensor device or the microphone device can be accommodated in particular dust-proof. Furthermore, the cabling effort within the suction device for the signal-effective connection with a control device can be minimized.

Accordingly, it is advantageous if the acceleration sensor device and / or the microphone device is arranged outside of dust-collecting and dust-carrying regions of the suction device. As a result, they are protected accordingly and results in a long life. Furthermore, it is prevented that a buildup of dust on the acceleration sensor device or microphone device falsifies measurement data.

In an advantageous embodiment, the acceleration sensor device and / or the microphone device is arranged on a control device of the suction device and is arranged in particular on a circuit carrier (a circuit board) of the control device. As a result, contactless acquisition of measured data can be achieved in a simple manner. The acceleration sensor device or microphone device is arranged in a dust-proof area. The cabling effort is minimized. Furthermore, the production cost is minimized. It is fundamentally possible for the acceleration sensor device or the microphone device to comprise a separate evaluation device, wherein the evaluation device of a control device of the signal device then processes prepared measurement data, in particular in the form of a Provide speed. It can also be provided that the evaluation device is integrated in the control device of the suction device.

It is advantageous if the evaluation device and / or a control device of the suction device comprises a storage device in which a characteristic field of the suction device is stored, wherein a current suction volume flow from a determined speed from the characteristic field can be determined. The characteristic field indicates, in particular, the dependence of a speed on a suction volume flow as a function of a set motor voltage of the drive motor of the fan device. It can then be calculated from an ascertained via the acceleration sensor device and / or microphone device speed of the impeller, the current suction flow rate. In turn, a control method is possible in which, for example, a motor voltage is set and the large guide is a predetermined suction volume flow. It can then be detected, for example, a variation of the suction flow rate by adding the filter device or by dust loading a separator and it is a compensation in the sense possible that in particular by a controlled voltage application of the drive motor, the suction flow rate is maintained at the predetermined value.

In particular, a determination of the current intake flow rate from the determined speed and a determined motor voltage or a determined pressure is provided. The rotational speed is determined via the acceleration sensor device and / or the microphone device. The motor voltage can be measured directly or it can be calculated by calculating it in particular from corresponding time parameters in a phase control. In principle, it is also possible that the current intake volume flow is determined from the determined speed and a determined pressure. The determined pressure is in particular a pressure after a filter device before a blower inlet. It is particularly advantageous if a control device of the suction device has a control member, by which a Saugvolumenstrom corresponding to a predetermined Saugvolumenstroms by controlling a motor voltage of the drive motor is adjustable, in particular the suction volume flow is a reference variable of the scheme and the motor voltage is a control variable of the scheme. It can thereby achieve an energy-saving operation of the suction device. In the case of a "fresh" filter device or in the case of a separator device which is not loaded, a predetermined suction volume flow can be achieved with a correspondingly minimized power consumption of the drive motor. If with increasing hours of operation of the suction device, the filter device clogged and / or the separator is increasingly loaded with dirt, causing corresponding additional pressure losses are generated in the system, then can be held by appropriate change in the motor voltage in a control method, the predetermined suction flow rate. The predetermined suction volume flow is predetermined externally, for example.

It is advantageous if the predetermined suction volume flow is adjustable and in particular an operating element for setting the predetermined suction volume flow is provided. An operator can then, for example, according to the nature of the area to be cleaned set the suction flow adjusted.

For example, it is also possible to determine the state of the filter device from the measured data of the acceleration sensor device or the microphone device. It is advantageous if the control device is associated with a filter level indicator, wherein the evaluation device determines a filter level of the filter device as a function of a determined speed and the characteristic field. For example, a determination is made on the basis of a determined speed and a determined motor voltage (measured or calculated) and the characteristic field. In principle, it is also possible for the determination to be based on a determined rotational speed, a measured pressure (after a filter device before a blower inlet) and the characteristic field. The fill level display can then be used, for example, to display analog or digital as to whether replacement or cleaning of the filter device is necessary or not, or it can be indicated that an energy-saving operation is possible when the filter device or cleaning is replaced. The filter level indicator can be, for example, a visual or audible indicator.

The invention is also based on the object to provide a suction device of the type mentioned, in a simple way a

Control of the suction operation is possible and in particular a control for an energy-saving operation without deterioration of the suction volume flow is possible. This object is achieved according to the invention in the suction device mentioned above in that at least one flow channel is provided with a defined flow path, which is acted upon by a suction flow, and a closure element is provided, through which in a suction operation the at least one flow channel can be closed.

In the suction device according to the invention, a flow channel is provided with a defined pressure drop when the flow channel is subjected to an air flow. In a suction operation (intended operation of the suction device for the extraction of areas to be cleaned), the at least one flow channel is not effective. He is closed by the closure element.

By opening the closure element of the flow channel can be acted upon by the suction flow. As a result, defined conditions are set at the suction device, in which, in particular, a current suction volume flow is determined. This determination can be carried out by the flow channel with the defined flow path and in particular with a defined pressure drop so that, for example, at a suction Connection connected components of the suction device does not significantly affect the determination.

This makes it possible to provide comparative data or calibration data, which can then be used to support a control, in particular for energy-saving operation while maintaining a predetermined suction volume flow.

Basically, the provision of the flow channel with the defined flow path is independent of the way in which the current suction volume flow is determined. An advantageous embodiment results when a rotational speed of the motor is determined via an acceleration sensor device or a microphone device and in particular without contact.

It is favorable if the at least one flow channel is assigned an inlet which provides a fluid-effective connection with the outer space and which is in particular spaced from a suction connection. As a result, the defined flow path can be realized in particular with a defined pressure drop.

It is particularly advantageous if the closure element is assigned a further closure element or the closure element is designed such that a suction connection is closed by the closure element or by the further closure element when at least one flow channel is open. This results in stable defined flow conditions with a defined pressure drop. Components of the suction device, which are connected to the suction port, do not affect the defined flow path.

It is advantageous if the closure element has a first position in which the at least one flow path is closed for a suction flow and the suction connection is released, and a second position ment, in which the suction port is closed for a suction flow and the at least one flow path is released for a suction flow. If the closure element is in the first position, then a suction operation (intended operation) of the suction device can take place. In the second position of the closure element, a type of comparison process or calibration process can take place, wherein defined flow conditions are established, and the current suction volume flow is determined "undisturbed". It is particularly advantageous if the closure element is attached to a

Switch for activating and / or deactivating a suction operation is coupled and in particular is coupled to the switch, that is released at a switch operation for activating and / or deactivating the suction operation, the at least one flow channel for a certain period of time for a suction flow. For example, if the suction device is to be turned on, then the switch is actuated. This operation can be used to initiate a "calibration process" in which the suction flow is applied to the at least one flow channel with the defined flow path. This is alternatively or additionally possible even with a deactivation of a suction operation; the switch is actuated to turn off the suction device. It can then be determined, the current Saugvolumenstrom and stored accordingly, so that is held at a later activation of the suction, the actual suction volume flow to the predetermined suction flow rate.

It is basically possible that the closure element is mechanically coupled to the switch. A corresponding mechanism is provided, which initiates a corresponding movement of the closure element by mechanical coupling via a movement of the switch.

In one embodiment, the closure element is associated with a spring device whose spring force tends to bring the closure element in a position and / or to hold, which the at least one Strö- closing channel. As a result, a closing process and in particular automated closure of the at least one flow channel can be achieved in a simple manner. For example, this makes it possible to hold the closure element in an open position solely by means of a corresponding aerodynamic effect of a suction flow. It must be overcome to the spring force of the spring device. If the suction flow is eliminated or reduced, then an automatic closing can be achieved. The spring force of the spring device ensures a movement of the closure element, which closes the at least one flow channel. A short-term strong reduction of the motor voltage results in a strong reduction of the suction current. The aerodynamic effect which the suction flow exerts on the closure element is then interrupted and the spring device ensures the closure of the closure element due to the spring force of the spring device.

It is favorable if the spring device is dimensioned such that a suction flow in the at least one flow channel holds the closure element open and, if the suction flow is omitted or reduced, the at least one flow channel is closed by the closure element. The aerodynamic effect of the suction flow ensures that the closure element is kept open. If the suction flow is correspondingly greatly reduced (by reducing the motor voltage of the drive motor), then this aerodynamic effect is interrupted and the spring device ensures due to its spring force for an automatic movement of the closure element in a closed position on the at least one flow channel.

It is also possible for there to be a signal-effective connection between a switch actuation and the movement of the closure element, in particular via a control device. It is advantageous if a drive motor is provided for moving the closure element. A control device can drive the drive motor accordingly, in which case the control device corresponding switching signals relative way position signals of a switch for activating and / or deactivating a suction evaluates.

In particular, the suction device is designed as a portable device, which can also be mobile. The suction device is then a stand-alone device. It is also possible, for example, for the suction device to be arranged on a device with further functionalities, for example on a self-propelled floor cleaning machine. It is advantageous if a separator device is provided, wherein in particular the separator device is associated with at least one vibrating element, which has a vibratable region, and wherein the vibratable region is exposed to a suction in a suction operation and vibrations by means of the acceleration sensor device and / or the microphone device detectable are . The vibrating element is a passive element which can be excited by the suction flow. Vibrations of the at least one vibrating element are expressed in a sound output or in an additional acceleration component which can be determined by the acceleration sensor device. With a corresponding positioning of the at least one vibration element on the separator device, a fill level of the separator device can be detected. A vibration state of the at least one vibrating element can be dependent on an air column between the vibrating element and a counter surface, with appropriate design. If the mating surface is formed by accumulated dirt in the separator, then the vibration state is dependent on the degree of filling, which in turn can be determined without contact.

The invention is further based on the object to provide a method of the type mentioned by means of which in a simple way the current intake flow especially "minimally invasive" (without direct contact with functional components such as an impeller, drive motor, a filter device, a dust chamber, etc. ) can be determined. This object is achieved according to the invention in the method mentioned that a speed of an impeller by means of an acceleration sensor device and / or a microphone device is determined and a current intake flow is determined from a stored characteristic field and the determined speed.

In this way, a rotational speed of the impeller from measured data of the acceleration sensor device and / or a microphone device can be determined in a simple manner, in particular without contact, and used in particular for a control method.

In particular, the current intake volume flow is determined from the characteristic field, the determined speed and a determined motor voltage or a determined pressure. The determined motor voltage is in particular measured or calculated. When calculating the motor voltage, this is calculated, for example, in a phase control from time variables. If a pressure after a filter device is measured before a blower inlet, then the suction volume flow can also be determined from the characteristic field, the determined speed and this pressure.

It is advantageous if a suction volume flow is adjusted in accordance with a predetermined suction volume flow via regulation of a motor voltage. For example, a phase control is provided for driving the motor. By setting the appropriate parameters, the motor voltage is set in particular regulated. It can thereby be achieved in particular an energy-saving operation of the suction device. For example, an operator presets a suction volume flow depending on the area to be suctioned. Even with clogging of the filter device or filling of a separator this suction volume flow is maintained. However, it is possible to obtain the predetermined suction volume flow with a minimized expenditure of energy adapted to the state of the filter device or the state of the separator device. It is also possible to determine a filter level of the filter device from the current suction volume flow. If the current suction flow rate (and motor voltage) is known and the associated speed and motor voltage are compared with the speed and motor voltage needed to maintain the same suction flow rate with the filter device unloaded, then the corresponding speed and / or or the corresponding motor voltage is a measure of the filter level. It is particularly favorable if, during activation and / or deactivation of a suction operation, a suction flow is conducted into a defined flow path for a specific period of time. This results in defined conditions and in particular a defined pressure drop in order to be able to determine a current suction volume flow.

In particular, the current intake volume flow is determined as a comparison value in a certain period of time. In particular, a motor voltage is determined or determined a pressure from the dust chamber. Based on this, a control method for setting a current suction volume flow corresponding to a given suction volume flow can then take place.

The determined time is advantageously at most 15 seconds.

It is particularly advantageous if, during a suction operation, the defined flow path for a suction flow is closed by a movable closure element. The defined flow path, which is formed in particular on at least one flow channel, then does not interfere with the suction operation (intended operation) of the suction device. It is favorable if the closure element is kept open by a suction flow in the defined flow path and if the suction flow is eliminated or reduced, an automatic closure of the flow path through the closure element takes place. element is spring loaded. Due to the aerodynamic effect of

Suction flow, the closure element can be kept open. With appropriate training, an automatic closure of the closure element can be achieved if this suction flow is interrupted. If, for example, the motor voltage is briefly reduced, then this leads accordingly to an interruption of the suction flow with elimination of the aerodynamic effect. This allows a movement of the closure element to close the defined flow path. In particular, the closure element is spring-loaded. The corresponding spring device is dimensioned so that when interrupting or reducing the aerodynamic effect of the suction flow, the spring force of the spring device causes a closing movement of the closure element. This can be controlled in a simple manner by driving the drive motor accordingly. It can thus be determined in a simple and automated manner, a current suction flow under defined conditions, in particular to be able to perform an optimized control or regulation process in suction.

It may also be beneficial if a suction port for a suction flow is closed during the specific period of time. As a result, elements arranged at the suction port, such as suction hose, tool (such as floor nozzle), suction pipe, etc., do not affect the measuring operation during the certain period of time. It is also possible for further information to be determined and / or used via the acceleration sensor device and / or the microphone device and the acquired measurement data. This information can be, for example: a change of soil during a suction operation, a tool change of a suction tool, a change of accessories on the suction device, actuation of a false air flap, position of the suction device in space, movement of the suction device, level detection on a separator. For example, it is possible to detect via the acceleration sensor device if a suction device on which the suction device reacts is slipped off a base. A soil change in a suction operation can be detected, for example, via a change in frequency in the measurement data of the acceleration sensor device or microphone device. For example, sudden changes can be detected and an error signal can be generated. An accessory change to the suction device is, for example, the replacement of a suction hose or a suction tube.

The inventive method can be performed on the suction device according to the invention or the suction device according to the invention can be operated with the inventive method.

The following description of preferred embodiments is used in conjunction with the drawings for further explanation of the invention. Show it :

Figure 1 is a schematic sectional view of a first Ausfüh

For example, a suction device according to the invention, wherein a flow channel is closed;

Figure 2 is the same view as Figure 1 with the flow channel open;

Figure 3 is a schematic partial sectional view of a second embodiment of a suction device according to the invention with a closed flow channel;

FIG. 4 shows the same view as FIG. 3 with the flow channel open;

Figure 5 is the same view as Figure 4, with a switch compared to

Figure 4 is in its initial position; Figure 6 is a schematic block diagram representation of components of an embodiment of a suction device according to the invention; Figure 7 is a schematic flow diagram for the operation of a suction device according to the invention;

Figure 8 is a schematic representation of a family of characteristics of a drive motor for a suction device according to the invention; and

Figure 9 is a schematic representation of an embodiment of a

Control sequence.

A first embodiment of a suction device 10 according to the invention (FIGS. 1, 2) is designed as a portable vacuum cleaner (stand-alone device).

The suction device 10 comprises a housing 12 with a lower part 14 and a top 16. The upper part 16 is detachably attached to the lower part 14. On the lower part 14, a driving device 18 is arranged, which has, for example, spaced rear wheels 20 and a front wheel 22. The

Front wheel 22 is formed for example as a steering role.

On the housing 12 and in particular on the lower part 14, a suction port 24 is arranged. The suction port 24 has a suction nozzle 26. At the suction nozzle 26, a suction hose 28 is connected or connected.

At one end of the suction hose 28, which is remote from an end, via which the suction hose 28 is connected to the suction port 24, a tool 30 is positioned or positioned. The tool 30 is in particular a nozzle such as a floor nozzle or a crevice nozzle. It can also be provided that a suction tube such as a telescopic tube is connected to the suction hose 28, and that the tool 30 is then positioned on this suction pipe.

In the lower part 14, a receiving space 32 is formed for suction. The suction port 24 is in fluid communication with the receiving space 32.

The suction connection 24 is associated, for example, with a tubular element 34, which is positioned in an interior of the housing 12 and which opens into the receiving space 32 via an orifice 36.

On the tube member 34, a deflecting element 38 is arranged in the receiving space 32, which is for a deflection of sucked

Dirt particles in the receiving space 32 provides.

Dirt can be directly absorbed by the receiving space 32 or in the receiving space 32, a dirt receptacle and in particular a dust bag 31 are positioned, which is then connected to the pipe element 34 accordingly. The receiving space 32 or the dirt receiving container accommodated in it form a separator 33.

In the housing 12 and in particular in the upper part 16, a blower device 40 is arranged. The blower device 40 generates a corresponding suction flow. The blower device 40 includes a blower 42 with one or more impellers. These are driven by a drive motor 44. The drive motor 44 is in particular an electric motor. Between the blower device 40 and the receiving space 32 is a

(Dirt) filter device 46 is positioned, which comprises one or more filters. The filter device 46 has the receiving space 32 facing a dirty side 48 and the blower 42 facing a clean side 50. A Suction flow, which flows through the filter device 46, is cleaned, wherein dust particles remain on the filter device 46 or fall into the separator device 33. In the embodiment shown, the filter device 46 comprises the dust bag 31, which is air-permeable but dust-impermeable. The filter device 46 comprises a further filter 51 (only indicated in FIGS. 1 and 2), which is connected upstream of the blower device 40 with respect to the air flow and is assigned to the receiving space 32.

The inventive method, which will be explained later, is basically also applicable if the filter device 46 is designed differently than described and is designed for example as a liquid filter device and not as a dry filter device.

In the housing 12, a control device 52 is arranged in particular dust-proof. The control device 52 comprises one or more circuit carriers 54 (circuit boards) on which, in particular, electrical or electronic switching elements are arranged.

The suction device 10 has a switch 56 which serves for switching on (activating) or switching off (deactivating) a suction operation. The switch 56 is assigned in one embodiment, a return spring 58, which resets the switch 56 in an initial position when no pressure force is exerted on the switch 56 in the direction of the lower part 14 added. The switch 56 is signal-effectively connected to the control device 52. On the housing 12, a control element 60 is arranged, which is in signal-effective connection with the control device 52. By the operating element 60, which is designed for example as a rotary switch, a suction volume flow for a suction operation of the suction device 10 can be specified.

The blower device 40 is associated with a measuring device 62 which determines a rotational speed ω of the impeller without contact. The measuring device 62 is based on a detection of an imbalance in the suction device 10, wherein a rotational speed ω * is then determined from the measured values via a corresponding algorithm or a comparison table. The determined speed ω * is an approximation of the actual speed ω.

The measuring device 62 comprises an acceleration sensor device 64 with one or more acceleration sensors.

An acceleration sensor is a sensor that measures its acceleration. For example, the inertial force acting on a test mass is determined for this purpose.

In an alternative embodiment, wherein a combination is also possible, the measuring device 62 comprises a microphone device 64 'with one or more microphones. A microphone is a sound transducer that converts airborne sound as sound pressure oscillations into corresponding electrical voltage changes as a microphone signal.

As a result of the measuring device 62 as acceleration sensor device 64 and / or microphone device 64 ', inertial fluctuations or sound fluctuations on the suction device 10 can be determined directly. These fluctuations include at least one component due to imbalance. This component is available in direct binding with the rotational speed ω of the impeller, which is driven by the drive motor 44, so that at least an approximate value ω * for this speed can be determined from the measured data of the acceleration sensor device 64 or microphone device 64 '; the imbalance is due to the rotation of a shaft of the drive motor 44 and / or an impeller of the fan 42 connected to the shaft.

In principle, imbalances lead to inertial fluctuations that can be detected by an acceleration sensor device 64. Such inertial variations can also lead to housing vibrations caused by the

Microphone device 64 'are detectable. Sound fluctuations can also be directly attributed to the number of blades in an impeller. This can be determined by the microphone device 64. The microphone device 64 can determine the rotational frequency of the drive motor 44 (indirectly) via a generated audio frequency; A total imbalance of a blower system initiates structure-borne sound into housing parts via bearing points. These housing parts radiate airborne sound, which has a frequency corresponding to the rotational frequency of the drive motor 44. Alternatively, the rotational frequency of the drive motor 44 may be determined from a leaf repetition rate of blades of the impeller. By non-contact past static components or by flow inhomogeneities tones are generated, which have n times the frequency of the rotational frequency of the drive motor 44, where n is the number of sheets of the impeller. In principle, the arrangement of the measuring device 62 within the housing 12 may be arbitrary. For example, an arrangement directly on the blower device 40 is possible. However, there may be an acceleration too high there. In one embodiment, the measuring device 62 is arranged on the circuit carrier 54 of the control device 52. It is thus spaced from the blower device 40 and thus spaced from the drive motor 44 protected in the housing 12 is arranged. The measuring device 62 is disposed outside of a dust-carrying or dust-collecting area in the housing 12 and thus dust-proof.

In the housing 12, a flow channel 66 is arranged or formed, which defines a defined flow path 68 (Figure 2) with defined pressure losses, said defined flow path 68 is closed in a suction operation of the suction device 10 for a suction flow.

In one exemplary embodiment, the flow channel 66 is arranged in the upper part 16 and, in particular, is arranged directly above the tubular element 34. "Above" refers to the direction of gravity when the suction device 10 is placed over their driving device 18 on a flat and especially horizontal surface. An inlet 70 is arranged on the housing 12, associated with the flow channel 66, via which the flow channel 66 is fluidically connected to the outer space 72.

The flow channel 66 extends away from the tubular element 34 in a height direction 74 toward an upper side 76 of the housing 12. The inlet 70 is remote in the region of one end of the flow path 68 to the

Pipe element 34 is positioned.

In one embodiment, the inlet 70 is disposed below the switch 56 relative to the height direction 74.

The flow channel 66 is associated with a movable closure element 78. An opening 80 (FIG. 2) is formed on the tube element 34, via which the flow channel 66 can be brought into fluid-effective connection with the mouth 36 and thus with the blower device 40. Via the opening 80, the flow channel 66 opens into the tubular element 34. A suction flow, which is generated by the blower device 40, can act on the opening 80 through the flow channel 66.

The closure element 78 is arranged such that it can swivel and, for example, be arranged on the tube element 34 such that the opening 80 can be closed or can be released.

In a first position 82 (FIG. 1) of the closure element 78, the closure element 78 covers the opening 80 so that the flow channel 66 is fluid-effectively separated from the blower device 40 and thus the flow channel 66 can not be subjected to a suction flow.

The closure element 78 has a second position 84 (FIG. 2), in which the opening 80 is released and the flow channel 66 can be acted upon by a suction flow of the blower device 40. It is then the defined flow path 68 formed within the housing 12.

In one exemplary embodiment, the closure element 78 is arranged and designed such that in the second position 84 the suction connection 24 is closed, that is, no suction is possible at the suction connection 24.

The closure element 78 thereby forms a flap, which closes the opening 80 in the first position 82 and thereby releases the suction port 24 for a suction flow, and in the second position 84 closes the suction port 24 for a suction flow and thereby the defined flow path 68 in the flow channel 66 releases.

For movement of the closure element 78 between its first position 82 and the second position 84 or between the second position 84 and the first position 82 and for holding in the first position 82 and the second position 84, a drive motor 86 is provided in one embodiment. This drive motor 86 is in particular a Electric motor. It is in particular positioned on or in the region of the tubular element 34 in the upper part 16 of the housing 12.

The drive motor 86 is controlled by the control device 52.

In the suction device 10, the closure element 78 is signal-effectively coupled to the switch 56, wherein this coupling takes place via the control device 52. The control device 52 controls the drive motor 86 for the movement of the closure element 78 in dependence on the position of the switch 56.

In a suction operation of the suction device 10, the closure element 78 is in its first position 82 (Figure 1). The flow channel 66 is thereby closed. He is not charged with a suction flow.

Before commissioning the suction operation (ie before activation of the suction operation) and / or after completion of the suction operation (after deactivation of the suction operation), the flow channel 66 can be supplied with a suction flow. Since the activation or deactivation of the suction operation takes place via the switch 56, there is a coupling between the switch 56 and the closure element 78.

For example, before activation of the suction operation, which is initiated by actuation of the switch 56, the closure element 78 is brought from the first position 82 to the second position 84 for a certain period of time. As a result, the defined flow path 68 is released. A suction flow flows in the flow channel 66, whereby the fluid-effective connection with the outer space 72 and the inlet 70 is established. There are thus set to the suction device 10 defined flow conditions. The measuring signals, which the measuring device 62 detects, are thus not influenced by "consumers" at the suction connection 24. The corresponding measuring signals of the measuring device 62 form a comparison value. This comparison value is a measure of the degree of soiling of the filter device 46 and also of the separator device 33, that is to say for the degree of clogging of the filter device 46 and also of the separator device 33; Any elements which are connected to the suction port 24 do not affect the measurement by the measuring device 62, since in the second position 84 of the closure element 78, the suction port 24 is closed relative to the outer space 72.

The determination of comparison values takes place for the specific period of time, in particular after actuation of the switch 56 before activation of the suction operation. The specific time period is in particular a maximum of 15 seconds. After the determined period of time, the activation of the suction operation takes place in that the control device 52 brings the closure element 78 from the second position 84 into the first position 82.

It may alternatively or additionally be provided that after actuation of the switch 56 for switching off the suction device 10, the control device 52 activates the drive motor 86 such that the closure element is brought from the first position 82 to the second position 84 and thereby the defined flow path 68 produced becomes. The corresponding measurement data are determined by the measuring device 62 and determined as comparison values and stored in particular. After the determined time period of a maximum of 15 seconds, a final shutdown of the suction device 10 takes place.

It is possible that, for example via the speed determination, an admission of the flow channel with a suction flow is controlled. For example, if it is determined that the rotational speed does not change over a certain period of time, in particular because the suction operation is activated but the suction device is not being used "suction," then the flow path 68 can be released by the closure element 78 is brought into the second position 84. FIG. 6 shows the essential components for a controlled or regulated operation of the suction device 10 in a schematic block diagram representation. The controller 52 controls the respective components and provides a control operation.

The measuring device 62 (that is to say the acceleration sensor device 64 and / or the microphone device 64 ') are, as mentioned above, arranged in particular on a circuit carrier 54 of the control device 52.

The measuring device 62 determines contactlessly a rotational speed ω * as an approximation for the actual rotational speed ω of the impeller of the fan device 40.

Basically, the measuring device 62 may comprise an evaluation device 88, which evaluates its measured data, which are acceleration data or electrical voltage changes correlated directly with sound pressure oscillations, in order to determine the rotational speed ω *. It is also possible that the measuring device 62 provides its "raw" measurement data to the control device 52 and the control device 52 comprises a corresponding evaluation device 88, which determines the rotational speeds ω *.

The control device 52 controls the drive motor 44. By means of the control device 52, the speed ω of the drive motor 44 can be adjusted by adjusting the voltage.

Via the operating element 60, an operator can set a predetermined suction volume flow. In this case, the control device 52 controls the suction device 10, in particular via a control loop, in such a way that, in particular, the predetermined suction volume flow is obtained independently of the degree of contamination of the filter device 46. The control device 52 comprises a control member 90, by means of which a predetermined by the control element 60 suction volume flow is adjustable, regardless of the degree of clogging of the filter device 46th

The control method is explained schematically with reference to FIG. 7:

The blower device 40 generates a suction flow, which is performed by the filter device 46 and through the receiving space 32 directly or via a dirt receptacle, which is positioned in the receiving space 32 is performed. In suction operation, the suction flow at the suction port 24 into the suction hose 28 (optionally via a suction pipe) flows to the tool 30 and it can be applied to a cleaning area with the suction flow. The blower device 40 generates a suction air flow with the volume flow Q and the pressure p. The hydraulic power P, which must apply the blower device 40 results at a pressure difference Δρ as

P = A _P Q (1) The actual pressure p and the actual suction flow rate Q are influenced in a corresponding flow path 92 between the tool 30 and the blower device 40 by elements 95 which are seated on the suction port 24. This is the suction port 24 itself, the suction hose 28, a suction tube, the tool 30 or a seated on the suction hose 28 and the suction pipe handle.

Furthermore, the pressure p and the suction volume flow Q are influenced by the filter device 46 and by the separator device 33, which in particular comprises the receiving space 32 (with or without dirt receptacle). The drive motor 44 of the blower device 40 rotates at a certain speed ω. Accordingly, an impeller of the blower device 40 rotates at the rotational speed ω (when no transmission is provided). The measuring device 62 provides measurement data, from which the rotational speed ω * can be determined as an at least good approximation for the rotational speed ω. The acceleration sensor device 64 and / or the microphone device 64 'directly detects imbalances in the system, which are correlated with the rotational speed ω of the impeller or the rotational speed ω of the drive motor 44. The control device 52 has a memory device 94. A characteristic field 96 (FIG. 8) of the blower device 40 is stored in the memory device 94. The characteristic curve field indicates, for example, the dependence of the intake volume flow Q on the rotational speed ω (curves 98 in accordance with FIG. 8) as a function of a set voltage on the drive motor 44 (and thus a set blower power). Furthermore, the dependence of the pressure p (negative pressure) as a function of the (suction) volume flow Q is indicated (curves 100 according to FIG. 8).

Via the measurement data of the measuring device 62, which are forwarded to the control device 52 before or after the evaluation by the evaluation device 88, the control device 52 knows the rotational speed ω of the impeller at least approximately via the value ω *.

In the control method, a given suction volume flow is predetermined as a reference variable via the operating element 60. A current intake volume flow can be determined from the determined speed ω * (current speed), the motor voltage (or a pressure after the filter device 46 before the fan inlet) and the characteristic field 96. In the control element 90, this is compared with the reference variable, that is to say the predetermined suction volume flow. If there is a deviation here, wherein, in particular by adding the filter device 46, the current intake volume flow is smaller than the predetermined intake flow rate, then the controller 52 controls the drive motor 44 accordingly to obtain a higher hydraulic power. This is done by changing the motor voltage or the motor current. Via a voltage regulation or a current regulation, a power electronics part of the control device 52 controls the drive motor 44 accordingly.

In principle, it is sufficient if a corresponding determination is made before starting the suction operation (for example, directly before starting the suction operation after switching on via the switch 56 or after completion of a suction operation after switching off via the switch 56). The determination need not be made constantly during the operation of the suction device 10 as long as it is not operated too long. When determining the current suction volume flow of the drive motor 44 by means of the measuring device 62, the closure element 78 is brought into the second position 84 for the specific period of time. The influence of the accessory 95 can be eliminated thereby. According to the invention, the suction device 10 is operated in a controlled manner such that an operator prescribes a suction volume flow via the operating element 60. The control device 52 then sets in a control method via the control member 90, the suction volume flow corresponding to the predetermined suction volume flow. By adding the filter device 46 results in pressure losses. Such pressure losses also occur at the separator 33 by filling and clogging. By changing an operating point of the blower device 40, the suction volume flow is adjusted corresponding to the given suction volume flow for a given pressure loss, that is, in the control method, the given suction volume flow is used as a reference variable. Outside this control method, further relevant data can be obtained via the measuring device 62 and in particular via an acceleration sensor device 64. A state of the filter device 46 can be determined. The comparison of a necessary speed ω * and a motor voltage (or pressure after the filter device 46 before fan entry) compared to an output speed for a "fresh" filter device 46 and an output motor voltage (or output pressure in the dust chamber) characterizes the filter state. The control device 52 can thereby calculate the state of the filter device 46 and, for example, display it on a display 102 which is signal-effectively connected to the control device 52. The display 102 is, for example, an optical or acoustic element. For example, the display 102 may be digital to indicate whether replacement of the filter device 46 is necessary or not.

An acceleration sensor device 64 can also be used to detect the position of the suction device 10 in space, or it is possible to detect a movement of the suction device 10, in particular on a base. This can be used for example for warning displays or the like.

In a suction operation, the measuring device 62 can also be used to detect, for example, a soil change. This can manifest itself in a frequency change of measuring signals. Even a tool change, a change of accessories, the opening or closing of a false air damper or the adjustment of accessories (such as a hard floor cleaning function or a textile floor cleaning function in a floor nozzle) can be detected. An error check can be performed and, for example, an error can be displayed on the display 102. For example, if a short time, the means "sudden" change takes place, which is detected by the measuring device 62, an error signal can be displayed.

In principle, the power consumption of the drive motor 44 is increased over a longer time scale than, for example, a tool change or a floor change.

It can be provided that one or more pressure sensors 104 (see FIG. 2) are arranged in the housing 12. By means of such a pressure sensor 104, the (sub) pressure in the suction device 10 can be measured at a location which is exposed to the suction flow. The pressure sensor 104 is signal-effectively connected to the control device 52. By the

Measurement of the pressure over the at least one pressure sensor 104 at at least one point in the suction device 10, which is supplied with suction current, can be used to obtain additional information which can be fused in the control method.

In a further variant, (at least) one vibrating element 106 is arranged in the receiving space 32 directly or in a dirt receptacle which is positioned in the receiving space 32 (see FIG. The vibration member 106 is vibrated due to the suction flow in a vibrating region. For example, a sound radiation or acceleration values of the acceleration sensor device 64 are influenced. With an appropriate arrangement of the vibrating element 106, the vibration of an air column between dirt in the receiving space 32 and the vibrating element 106 depends. It can thereby gain information about the degree of filling of the receiving space 32, which are displayed accordingly and / or used. It is therefore advantageous if the vibrating element 106 with respect to the

Height direction 74 is disposed in an upper region of the receiving space 32. In principle, it is also possible that a speed of the impeller is detected by a measuring device 62, which has one or more optical sensors and / or one or more magnetic field sensors. The drive motor 44 is driven in one embodiment by the controller 52 via a corresponding voltage or a corresponding current. It is also possible that an adjustment of the power consumption of the drive motor 44 is carried out by a phase control or phase control.

In a variant, it is provided that characteristic curves or a characteristic field 96 can be read in a manufactured suction device 10 again. It can be provided that the suction device 10 comprises a data exchange interface, such as a radio interface, in order to be able to correspond to the outside world and in particular to another device and to be able to exchange data. It is then possible to control the suction device 10 via the further device, in order in particular to make corresponding settings.

In principle, provision may be made for the measuring device 62 to be arranged on the further device, that is to say that one or more sensor devices of the further device, such as a smartphone, are used for the regulating method.

In principle, it is also possible for the rotational speed of the drive motor 44 to be determined by means of a temperature sensor device, that is to say the measuring device 62 has one or more temperature sensors, which are then arranged correspondingly. It can be provided that the control element 90 of the control device 52 has a model of a control point; the control element 90 is, for example, an IMC (Internal Model Control) controller. It can also be provided that the regulating section is given a desired behavior by the control element 90, for example the time behavior of a pTI element with a long rise time. For this purpose, for example, an additional pre-filter is integrated into the control element 90. In principle, it is also possible that knowledge-based rules are stored in the control element 90.

In Figure 9, the control method is schematically explained again. The suction volume flow Q is the reference variable. The measuring device 62 determines a rotational speed ω * of the impeller. Further, a motor voltage U * (indicated by the reference numeral 300) is determined. It is measured or calculated directly by a measuring device 301, in particular from the time parameters of a phase control. Via the characteristic field 96 (indicated in FIG. 9 by the insert 302), which is stored in the memory device 94, the current suction volume flow Q * is then determined from this determined data (the rotational speed .omega. * And the motor voltage U *).

The characteristic curve field 96 indicates the dependence of the intake volume flow on the rotational speed at different engine voltages 300.

The rotational speed ω * as an approximation for the actual rotational speed ω is determined via the acceleration sensor device 64 or the microphone device 64 '. At the blower device 40, a load change (indicated by the arrow with the reference numeral 304) causes the current suction volume flow to deviate from the desired suction volume flow. The control element 90 changes the control of the drive motor 44. It is the motor voltage accordingly changed. This step is indicated in Figure 9 by the reference numeral 306. Changing the motor voltage can cause a speed change. In particular, the motor voltage is changed by setting corresponding time parameters (in particular the duration of zero voltages and the duration of maximum voltage values) in the phase-angle control. It will go through a corresponding control loop to bring the current suction flow to the desired suction flow rate.

In the described embodiment, the motor voltage 300 is determined. In principle, it is also possible that a pressure in a dust chamber is determined and then the current intake volume flow is determined via this pressure and the determined rotational speed. The associated characteristic is then a characteristic of the dependence of the suction volume flow on the speed of the impeller in dependence on different pressures in the dust chamber. A second embodiment of a suction device according to the invention, which is shown in Figures 3 to 5 and designated 108, is basically the same design as the suction device 10 with respect to the generation of the suction flow. The same reference numerals are used for the same elements.

In a housing 110, a receiving space 32 is formed. Further, a blower device 40 with drive motor 44 and fan 42 is arranged.

In the housing 110, a flow channel 112 is formed. The flow channel 112 serves to generate a defined flow path 68.

The flow channel 112 is associated with an inlet 114. On the housing 110 sits a suction port 116 with a suction nozzle 118 to which a suction hose is connected. The suction nozzle 118 opens into an extension 120 of the flow channel 112, which is arranged within the housing 110.

At the extension 120 sits a guide element 122 which conducts dirt into the receiving space 32.

The flow channel 112 is assigned a movable closure element 124. The closure element 124 has a first position 126 (FIG. 3) in which it is positioned in a closed position between the extension 120 and the flow channel 112. Dimensions of the closure element 124 correspond to internal dimensions of the suction channel 112. A suction flow can not penetrate into the flow channel 112 in the first position 126 of the closure element 124. It only flows through the suction port 116.

In the first position 126 of the closure element 124, a suction operation is possible, in which a suction flow is present at the suction connection 116. The suction device 108 has a switch 128, which serves to activate or deactivate the suction operation.

The switch 128 is movably mounted on the housing 116. He is in particular associated with a return spring 130.

The switch 128 is in a displacement direction 132 (direction and

Opposite direction) movable.

The closure member 124 is mechanically coupled to the switch 128. By a movement of the switch 128 during its actuation, the closure element 124 can be moved by direct mechanical coupling. In one embodiment, the closure element 124 is pivotally mounted on a pivot bearing 134. A pivot axis is at least approximately parallel to a wheel axis of a corresponding wheel device of the suction device 108. In Figures 3 to 5, the pivot axis is perpendicular to the plane.

To the switch 128, a strut 136 is pivotally connected to a pivot axis which is parallel to the pivot axis of the pivot bearing 134.

The strut 136 has a recess 138 at an end region which is opposite the region at which the strut 136 is articulated to the switch 128. The closure element 124 has a tab 140, on which a pin element sits, which is immersed in the recess 138. The recess 138 forms with the pin element of the tab 140 a link guide. FIG. 3 shows the first position 126, in which the flow channel 112 is closed with respect to a suction flow, that is to say the suction flow can not penetrate into the suction channel 112.

FIG. 4 shows a second position 142 of the closure element 124, in which the closure element 124 is open, that is, the flow channel 112 is released, and a suction flow, which is generated by the blower device 40, can flow into the flow channel 112. As a result, the defined flow path is provided with defined pressure conditions. In Figure 4, an intermediate position is shown.

If, starting from the first position 126 (Figure 3), the switch 128 is pressed, this is in the direction of displacement 132 down (to the Suction port 116 toward) moves. This movement causes the strut 136 to move. The downward displacement causes the flap 140 to pivot (Figure 4). The closure element 124 is thereby pivoted and releases an opening on the flow channel 112, so that the

Suction flow, which is generated by the blower device 40, can penetrate into the suction channel 112.

When the switch 128 is released, the return spring 130 causes a shift in the opposite direction. This shift takes the strut 136 with.

Through the slotted guide via the recess 138, the strut 136 can thereby move relative to the closure element 124, so that the closure element 124 remains open for a suction flow into the flow channel 112.

The closure element 124 is associated with a spring device 141, which comprises at least one spring. The spring means 141 is designed so that it is endeavored, due to its spring force, to bring the closure element 124 from its second position 142 according to FIG. 4 into its first position 126 according to FIG. In order to bring the closure element 124 from the first position 126 to the second position 142, the spring force of the spring device 141 must be overcome. In one embodiment, a corresponding spring of the spring means 141 is hinged to the tab 140 of the closure member 124. It is further articulated on a wall 143 of the flow channel 112. The spring device 141 is in particular dimensioned such that, when the closure element 124 is opened, that is in the second position 142, the aerodynamic effect of the suction flow in the flow channel 112 is sufficient, the closure element 124 (overcoming the spring force of the spring device 141) in its second position 142. If the corresponding suction flow is interrupted or reduced, then The sender device 141 automatically adjusts the closure element 124 into its first position 126, thereby closing the flow channel 112. When the suction flow is interrupted or reduced, its aerodynamic effect for keeping the closure element 124 open is no longer present.

The interruption of the suction flow is achieved by greatly reducing the motor voltage of the drive motor 44. This is achieved by a corresponding control by the control device 52.

In this way, the closure element 124 can be kept open for a certain period of time in a simple manner, and an automated closure can easily be achieved after this specific period of time has elapsed.

As mentioned above, the closure element 124 then remains open for the specific period of time in order to determine comparison data with the defined flow path in the flow channel 112 with a defined pressure drop. In particular, the specific period of time is set via a corresponding design and arrangement of the closure element 124. By appropriate pressure conditions, the closure element 124 is automatically moved during a certain period of time from a second position 142 to the first position 126 when the flow channel 112 is subjected to the suction flow, and the flow channel 112 is then closed again.

In the suction device 108, the closure member 124 is formed so as not to close the suction port 116 in the second position 142 unlike the embodiment of the suction device 10. As a result, in principle, a partial flow of the suction flow can be present at the suction port 118. If the suction channel 112 is sufficiently large and in particular has a sufficiently large hydraulic cross section, then this partial flow at the suction port 118 is negligible with respect to the partial flow through the flow channel 112. Quantitatively, then the influence of elements on the suction port 118 is negligible, that is in the Flow channel 112 can be achieved in a good approximation defined ratios.

As a result, as described above, comparison values can be obtained which are largely independent of accessories which are connected to the suction connection 116 via the suction connection 118.

With regard to the control or regulation of the operation of the suction device 108, this basically works the same as described above with reference to the suction device 10.

Reference numeral suction device (first embodiment) housing

lower part

top

drive system

rear wheel

front

suction

Tool

anther

accommodation space

trap structure

tube element

muzzle

deflecting

blower

fan

drive motor

filtering device

dirty side

clean side

filter

control device

circuit support

switch

Return spring

operating element

measuring device Acceleration sensor device

microphone device

flow channel

flow

inlet

outer space

height direction

top

closure element

opening

First position

Second position

drive motor

evaluation device

regulating member

flow

memory device

elements

Of characteristics

Curve

display

pressure sensor

vibrating element

Suction device (second embodiment)

casing

flow channel

inlet

suction

renewal

vane

closure element 126 First position

128 switches

130 return spring

132 shift direction

134 pivot bearings

136 strut

138 recess

140 tab

141 spring device

142 Second position

143 wall

300 motor voltage

301 measuring device

302 insert

304 load change

306 Change motor voltage

Claims

claims

Suction device, comprising a fan device (40) with a drive motor (44) for generating a suction flow, and a filter device (46), characterized in that the fan device (40) has an acceleration sensor device (64) and / or a microphone device (64 '; ), and in that an evaluation device (88) is provided which determines a rotational speed (ω) of an impeller of the fan device (40) from measurement data of the acceleration sensor device (64) and / or the microphone device (64 ').

2. Suction device according to claim 1, characterized in that the acceleration sensor device (64) and / or the microphone device (64 ') is arranged on the blower device (40) or at a distance from the blower device (40) is arranged and in particular the measurement data contactless with respect to Blower device (40) determined.

3. Suction device according to claim 1 or 2, characterized in that the acceleration sensor device (64) and / or the microphone device (64 ') is arranged outside of dust-collecting and dust-carrying areas.

4. Suction device according to one of the preceding claims, characterized in that the acceleration sensor device (64) and / or the microphone device (64 ') is arranged on a control device (52) of the suction device and in particular on a circuit carrier (54) of the control device (52). is arranged.

5. Suction device according to one of the preceding claims, characterized in that the evaluation device (88) in a control device (52) of the suction device is integrated.

6. Suction device according to one of the preceding claims, characterized in that the evaluation device (88) and / or a control device (52) comprises a memory device (94) in which a characteristic field (96) of the suction device is deposited, wherein a current suction flow from a determined speed (ω *) and the characteristic field (96) can be determined.

7. Suction device according to claim 6, characterized in that a determination of the current intake flow from the determined speed (ω *) and a determined motor voltage or a determined pressure is provided.

8. Suction device according to claim 6 or 7, characterized in that a control device (52) of the suction device comprises a control member (90), by which a Saugvolumenstrom corresponding to a predetermined Saugvolumenstrom by controlling a motor voltage of the drive motor (44) is adjustable, in particular the Suction volume flow is a reference variable of the control and the motor voltage of the drive motor (44) is a controlled variable of the control.

9. Suction device according to claim 8, characterized in that the predetermined suction volume flow is adjustable and in particular an operating element (60) is provided for setting the predetermined suction volume flow.

Suction device according to one of claims 6 to 9, characterized in that the control device (52) is associated with a filter level indicator for the filter device (46), wherein the evaluation device (88) a filter level of the filter device (46) in dependence of a determined rotational speed (ω * ), a determined motor voltage and the characteristic field (96) determined.

Suction device according to the preamble of claim 1 or one of the preceding claims, characterized by at least one flow channel (66; 112) having a defined flow path (68) which can be acted upon by a suction flow, and by a closure element (78; 124) through which in a suction operation, the at least one flow channel (66; 112) can be closed.

Suction device according to claim 11, characterized in that the at least one flow channel (66; 112) is associated with an inlet (70; 114) which provides a fluid-effective connection with the outer space (72) and which in particular is spaced from a suction port (24). is.

Suction device according to claim 11 or 12, characterized in that the closure element is associated with a further closure element or the closure element (78) is formed so that by the closure element (78) or by the further closure element with at least one flow channel (66) open a suction port (24) is closed.

14. Suction device according to claim 13, characterized in that the closure element (78) has a first position (82), in which the at least one flow channel (66) is closed for a suction flow and the suction port is released, and a second position (84 ), in which the suction port (24) is closed for a suction flow and the at least one flow channel (66) is released for a suction flow.

15. Suction device according to one of claims 11 to 14, characterized in that the closure element (78; 124) is coupled to a switch (56; 128) for activating and / or deactivating a suction operation and in particular to the switch (56; ) is coupled, that in a switch operation for activating and / or deactivating the suction operation of the at least one flow channel (66; 112) is released for a certain period of time for a suction flow.

16. Suction device according to claim 15, characterized in that the closure element (124) is mechanically coupled to the switch (128).

17. A suction device according to any one of claims 11 to 16, characterized in that the closure element (124) is assigned a spring device (141) whose spring force endeavors to bring the closure element (124) into a position and / or hold, which the at least one flow channel (112) closes.

18. Suction device according to claim 17, characterized in that the spring device (141) is dimensioned such that a suction flow in the at least one flow channel (112) holds the closure element (124) open and, in the absence or reduction of the suction flow, the at least one flow channel ( 112) is closed by the closure element (124).

19. Suction device according to one of claims 11 to 15, characterized by a drive motor (86) for movement of the closure element (78).

20. Suction device according to one of the preceding claims, characterized by a design as a portable device.

21. Suction device according to one of the preceding claims, characterized by a separator device (33), wherein in particular the separator device (33) is assigned at least one vibration element (106) having a vibratable region, and wherein the vibratable region exposed in a suction operation to a suction flow is and vibrations by means of the acceleration sensor device (64) and / or microphone device (64 ') are detectable.

22. A method for operating a suction device which comprises a blower device (40) with a drive motor (44) and a filter device (46), characterized in that a rotational speed (ω *) of an impeller of the blower device (40) by means of an acceleration sensor device (64 ) and / or a microphone device (64 ') is determined and a current suction volume flow from a stored characteristic field (96) and the determined speed (ω *) is determined.

23. The method according to claim 22, characterized in that the current suction volume flow from the characteristic field (96), the determined speed (ω *) and a determined motor voltage or a determined pressure is determined.

24. The method according to claim 22 or 23, characterized in that a suction volume flow is adjusted according to a predetermined Saugvolumenstrom via regulation of a motor voltage of the drive motor (44).

25. The method according to any one of claims 22 to 24, characterized in that a filter level of the filter device (46) is determined from the current suction volume flow.

26. The method according to the preamble of claim 22 or any one of claims 22 to 25, characterized in that upon activation and / or deactivation of a suction operation, a suction flow for a certain period of time in a defined flow path (68) is passed.

27. The method according to claim 26, characterized in that in the determined period of time, the current suction volume flow is determined as a comparison value.

28. The method according to claim 26 or 27, characterized in that the determined period of time is at most 15 s.

29. The method according to any one of claims 26 to 28, characterized in that in a suction operation of the defined flow path (68) for a suction flow through a movable closure element (78, 124) is closed.

30. The method according to claim 29, characterized in that the closure element (124) by an intake flow in the defined flow path (68) is kept open and in case of elimination or reduction of the suction flow, an automatic closure of the flow path (68) through the closure element (124) takes place, in particular, the closure element (124) is spring-loaded.

31. The method according to any one of claims 26 to 30, characterized in that during the determined period of time, a suction port (24) is closed for a suction flow.

32. The method according to any one of claims 22 to 31, characterized in that further information from measurement data of the acceleration sensor device (64) and / or the microphone device (64 ') are determined and / or used, which may include: soil change in a suction operation, tool change a suction tool, change of accessories on the suction device, actuation of a false air flap, position of the suction device in space, movement of the suction device, level detection at a separator.

33. Use of the suction device according to one of claims 1 to 21 for carrying out the method according to one of claims 22 to 32.