EP3257421B1 - Air blowing device for a vacuum cleaner, method for operating an air blowing device, control device and vacuum cleaner - Google Patents

Air blowing device for a vacuum cleaner, method for operating an air blowing device, control device and vacuum cleaner Download PDF

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Publication number
EP3257421B1
EP3257421B1 EP17170956.1A EP17170956A EP3257421B1 EP 3257421 B1 EP3257421 B1 EP 3257421B1 EP 17170956 A EP17170956 A EP 17170956A EP 3257421 B1 EP3257421 B1 EP 3257421B1
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EP
European Patent Office
Prior art keywords
motor
fan
bypass
blower device
adjusting element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP17170956.1A
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German (de)
French (fr)
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EP3257421A3 (en
EP3257421A2 (en
Inventor
Manfred Gerhards
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Miele und Cie KG
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Miele und Cie KG
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Publication of EP3257421A2 publication Critical patent/EP3257421A2/en
Publication of EP3257421A3 publication Critical patent/EP3257421A3/en
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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
    • A47L9/2805—Parameters or conditions being sensed
    • A47L9/2831—Motor parameters, e.g. motor load or speed
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/0072—Mechanical means for controlling the suction or for effecting pulsating action
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
    • A47L9/2836—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means characterised by the parts which are controlled
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
    • A47L9/2889—Safety or protection devices or systems, e.g. for prevention of motor over-heating or for protection of the user

Definitions

  • the invention relates to a blower device for a vacuum cleaner, a method for operating a blower device, a control device and a vacuum cleaner.
  • an electric blower which has a bypass for air cooling of the motor, the bypass comprising gravity-loaded flaps which are opened by the air flow of the blower against the restoring force of gravity.
  • an electric vacuum cleaner which has a bypass for air cooling of the motor, the bypass comprising spring-loaded valves which are opened by the air flow of the blower against the restoring spring force.
  • a vacuum cleaner can be used in the home to clean a floor.
  • the object of the invention is to provide an improved blower device for a vacuum cleaner, an improved method for operating a blower device, an improved control device and an improved vacuum cleaner.
  • this object is achieved by a blower device for a vacuum cleaner, a method for operating a blower device, a control device for operating a blower device and a dust collector with the features of the main claims.
  • an airflow that is sucked in can be used to cool a fan motor of the vacuum cleaner by guiding the airflow through the fan motor.
  • the cooling capacity can be regulated via the air flow directed through the fan motor. Air flow that is not required for cooling can be routed past the fan motor via a bypass.
  • a variable bypass is arranged in a channel between the fan and the fan motor.
  • the bypass is controlled by electronics.
  • the advantages that can be achieved with the invention consist, in addition to a needs-based cooling capacity for the fan motor, in an increased efficiency of the overall system, since the bypass has a lower flow resistance than the fan motor.
  • a vacuum cleaner can be understood to mean a cleaning device in which air is sucked in through a suction opening of the vacuum cleaner.
  • the negative pressure required for this can be generated using the blower motor and the blower.
  • a fan motor can be understood to mean an electric motor.
  • a fan can have a rotatable fan wheel or turbine wheel and a stationary guide device.
  • a motor bypass may be an alternative route for airflow from the fan past the fan motor.
  • An adjusting element can, for example, be a slide for adjusting a flow cross section of the engine bypass.
  • the motor bypass can have at least one bypass opening, which can be adjusted by the adjusting element, in an outflow channel of the fan. Due to a position close to the fan, air can flow out through the motor bypass with low losses.
  • the adjusting element can be mounted so as to be movable tangentially to an axis of rotation of the fan.
  • the adjusting element can have a gate which defines an opening cross section of the bypass opening.
  • the slide can be moved with a rotary movement.
  • the adjusting element can be mounted so as to be axially movable in relation to the axis of rotation.
  • An edge of the actuating element can define an opening cross section of the bypass opening. Due to the axial mobility, a simple motor can be used to move the adjusting element.
  • the adjusting element can be mounted so as to be movable radially to the axis of rotation.
  • the adjusting element can be retracted and extended into the outflow channel.
  • the actuating element can be shaped as a ramp which closes the flow cross section of the engine bypass in a first position and releases a flow cross section of the exhaust duct and in a second position releases the flow cross section of the engine bypass and closes a flow cross section of the exhaust duct.
  • the ramp can partially release the flow cross-sections in intermediate positions.
  • the control element can thus be used as a controllable two-way valve.
  • the air flow through the motor bypass can be adjusted as a proportion of a total air flow.
  • the blower device can comprise a control device according to the approach presented here.
  • the control device can be connected to a temperature sensor of the fan motor and a drive of the actuating element.
  • the control unit can take over the control directly.
  • a method for operating the blower device wherein in a step of providing an actuating signal for the actuating element using a temperature signal representing a temperature of the blower motor is provided in order to control a flow of cooling air through the blower motor.
  • the control signal can also be provided using a time signal representing a period of use of the fan motor.
  • a time signal representing a period of use of the fan motor.
  • the approach presented here also creates a control device which is designed to carry out, control or implement the steps of a variant of a method presented here in corresponding devices.
  • the object on which the invention is based can also be achieved quickly and efficiently by means of this embodiment variant of the invention in the form of a control device.
  • the control device can be designed to read in input signals and to determine and provide output signals using the input signals.
  • An input signal can, for example, represent a sensor signal that can be read in via an input interface of the control device.
  • An output signal can represent a control signal or a data signal that can be provided at an output interface of the control device.
  • the control device can be designed to determine the output signals using a processing rule implemented in hardware or software.
  • the control device can comprise a logic circuit, an integrated circuit or a software module and, for example, be implemented as a discrete component or be comprised of a discrete component.
  • a corresponding vacuum cleaner has a named blower device and a named control device which is designed to provide the actuating signal to the actuating element of the blower device via an interface.
  • the approach described can advantageously be used in a vacuum cleaner.
  • FIG. 1 shows an illustration of a blower device 100 for a vacuum cleaner according to an embodiment.
  • the blower device 100 can be installed in a vacuum cleaner.
  • One half of the blower device 100 is shown.
  • the blower device 100 has a blower motor 104 coupled to a blower 102 of the blower device 100.
  • An outflow channel 106 of the fan 102 leads to an inflow opening of the fan motor 104 in order to supply the fan motor 104 with a flow of cooling air generated by the fan 102 during operation.
  • the cooling air flow in the vacuum cleaner corresponds to the air sucked in through a filter device.
  • the cooling air flow flows through the fan motor 104 and cools the fan motor 104.
  • a motor bypass 108 is arranged in the outflow channel 106.
  • a flow cross section of the motor bypass 108 can be adjusted by a controllable adjusting element 110.
  • the actuating element 110 is moved by a drive unit 112 in response to an actuating signal 114.
  • the control signal 114 is provided by a control unit 116 for operating the blower device 100.
  • the control unit 116 reads a temperature signal 118 representing a temperature of the fan motor 104 from a temperature sensor 120 of the fan motor 104 and provides the actuating signal 114 as a function of the temperature in order to control the flow of cooling air through the fan motor 104.
  • FIG. 1 a fan device 100 in the form of a vacuum cleaner fan.
  • the blower device 100 is a combination of the blower motor 104 in the form of a drive machine or a motor, which converts the supplied electrical power into a torque and a speed, and the blower 102, which is designed as a work machine, which converts the applied torque and the speed into an aerodynamic negative pressure, respectively a pressure difference and converts a flow.
  • the overall efficiency of this unit is then made up of the product of the two prevailing individual efficiencies.
  • the fan motor 104 of the fan device 100 is, for example, a series motor (RSM) with high power density.
  • the fan motor 104 is actively cooled so that the power loss in the form of heat due to the high electrical input power is sufficiently dissipated.
  • the external cooling protects the motor 104 from destruction and the limits of the permissible winding temperatures are maintained.
  • the air flow generated by the fan 102 is passed through the interior of the fan motor 104, where the heat is absorbed and transported away both by the rotating armature and by the stator surface.
  • the cooling air introduced is not necessarily dependent on the suction air flow, since it does not always have to correspond to the suction air flow. If the dust bag fills up or the vacuum cleaner hose is closed, the temperature and speed of the motor rise sharply. A suitable regulation can prevent the available cooling air flow from being further reduced.
  • a significant increase in the overall efficiency of the fan unit can be achieved by the active regulation of the cooling air volume by the motor 104, as presented here.
  • the active material of the motor 104 can be better utilized in the adaptive thermal management presented here, since it is not necessary to maintain reserves and worst case scenarios.
  • the volume flow generated by the fan 102 can be passed completely through the motor 104. If, for example, due to lower performance requirements or increased motor efficiency, a complete flow through the motor 104 with the full volume flow is not or no longer necessary, bypasses 108 are activated in the fan housing. Due to the flow resistance of the motor 104, part of the volume flow generated is diverted out of the housing 102 through openings in front of the motor 104. The total resistance of the fan unit decreases.
  • controllable motor bypass 108 presented here is designed in such a way that sufficient motor cooling is guaranteed even under adverse conditions, such as overvoltage, strong suction throttling, clogged filters or high power settings.
  • the motor bypass 108 is connected directly downstream of the fan 102, as a result of which a large part of the deflection losses in front of the motor can be avoided.
  • the geometry is variable and allows adjustments.
  • the motor bypass 108 presented here can be optimized for many different types of blowers.
  • the cooling air flow supplied to the motor 104 and generated by the fan 102 is regulated, that is to say influenced by an active, set or regulated mechanical adjusting element 110.
  • This can be achieved by means of a bypass 108 or blow-out opening 108 upstream of the motor housing, which is variable in cross section, that is to say controllable in cross section.
  • this bypass 108 is located either as a radial outlet in the fan hood or as an axial outlet above or integrated within the diffuser, so that the lossy, multiple flow deflections up to the motor housing can be saved.
  • the adjustment or regulation of the bypass opening 108 takes place by adjusting the bypass link 110.
  • the known possibilities of adjustment such as rotational or translational, are used via a lifting magnet 112, a motor 112 or bimetal.
  • the control 116 can also be taken over with the existing processor (MC) of the vacuum cleaner, for example as a P or PI controller.
  • a temperature recording 120 can take place in the area of the winding head.
  • FIG. 2 shows an illustration of an actuating element 110 arranged in an outflow channel 106 according to an exemplary embodiment.
  • the adjusting element 110 corresponds essentially to the adjusting element in FIG Figure 1 .
  • the actuating element 110 here has the shape of a ramp which is designed to deflect the cooling air flow 200 from the fan to the side in a streamlined manner.
  • the adjusting element 110 completely blocks the outflow channel 106 when it is arranged in a completely extended position in the outflow channel 106.
  • the cooling air flow 200 then flows through a recess 202 in the Outflow channel 106 from.
  • the ramp 110 is retracted, the fan operates at maximum efficiency.
  • the outflow channel 106 and the adjusting element 110 are essentially oriented here as they are in FIG Figure 1 are shown.
  • FIG 3 shows an illustration of an actuating element 110 arranged in an outflow channel 106 according to an exemplary embodiment.
  • the adjusting element 110 corresponds essentially to the adjusting element in FIG Figure 2 .
  • the adjusting element 110 is arranged here in a completely retracted position.
  • the actuating element 110 thus completely closes the recess 202 and the cooling air flow 200 flows along the completely released outflow channel 106 to the fan motor.
  • the motor receives the maximum cooling capacity.
  • the adjusting element 110 When the adjusting element 110 is arranged in an intermediate position, the outflow channel 106 and the recess 202 are partially released.
  • the cooling air flow 200 is divided by the actuating element 110. A part flows on to the fan motor and a part escapes through the recess 202 into the motor bypass.
  • the ramps 110 are first moved out of the fan in the axial direction towards the B-end shield. They close off the axial opening 202 flush and direct the air flow 200 into the motor housing for cooling. If a maximum effect of the bypasses is to be made possible, the ramps 110 move axially into the housing in the direction of the A-bearing plate and thereby close the radial air duct 106 to the motor and at the same time deflect the air 200 in the axial direction and out.
  • the ramps 110 are immersed in the axial direction into the openings 202 of the pot as a function of the determined motor temperature, the bypass then being at a maximum, or immersed, the axial outlet 202 then being blocked.
  • the entire suction air 200 is then available as cooling air and is directed into the motor housing.
  • FIG. 4 shows a sectional illustration of a blower 102 with a motor bypass 108 according to an embodiment.
  • the fan 102 essentially corresponds to the fan in FIG Figure 1 .
  • the fan 102 has a housing 400 in which a shaft 402 of the fan 102 is mounted.
  • the housing 400 encloses a fan wheel 404 of the blower 102.
  • the housing 400 merges into the outflow channel 106.
  • the housing 400 has a number of openings 202 or bypass windows 202 along its circumference in the area of the outflow channel 106 or the hood.
  • the actuating element 110 is here arranged as a slide in a ring around an outer side of the housing 400 and is mounted so as to be axially displaceable relative to the shaft 402. About a position of the Adjusting element 110, an opening cross section or an effective bypass area of the openings 202 is set.
  • FIG. 5 shows an illustration of a blower device 100 with a motor bypass 108 according to an embodiment.
  • the blower device 100 corresponds essentially to the blower device in FIG Figure 4 .
  • the adjusting element 110 is arranged here in such a way that the openings 202 are half closed. This means that only half the opening cross section 500 is available for flow into the motor bypass 108.
  • FIG. 6 shows a sectional illustration of a blower 102 with a motor bypass 108 according to an embodiment.
  • the fan 102 essentially corresponds to the fan in FIG Figures 4 and 5 .
  • the actuating element 110 is rotatably mounted on the housing 400 here.
  • the adjusting element 110 has openings 600 which can be brought into congruence with the openings 202 in the outflow channel. The resulting flow cross section can be adjusted by rotating the adjusting element 110.
  • a bypass adjustment is shown in the hood 400 via a rotary adjustment.
  • FIG. 7 shows an illustration of a blower device 100 with a motor bypass 108 according to an embodiment.
  • the blower device 100 essentially corresponds to the illustration in FIG Figure 6 .
  • the adjusting element 110 is rotated with respect to the openings 202, so that the openings 600 in the adjusting element 110 only partially cover the openings 202.
  • the flow cross section 500 into the engine bypass 108 is reduced.
  • a rotary valve 110 is used on the fan cover 400 to deflect the air in a controlled manner or, after closing, to direct it into the motor for cooling.
  • a rotary valve 110 is used on the fan cover 400 to deflect the air in a controlled manner or, after closing, to direct it into the motor for cooling.
  • punched-out windows 202 on the circumference of the hood 400, through which the blower air can be discharged directly into the blower chamber of the vacuum cleaner.
  • the ring 110 can block the passage window 202 in the hood 400 by, as in the Figures 4 and 5 immersed in the axial direction and the passage window 202 of the hood 400 reduced in cross section 500 or as in the Figures 6 and 7th also has windows 600 in the circumference and, by turning, reduces or closes the cross section 500 of the passage window 202 in the hood 400.
  • Figure 8 shows a flow chart of a method for operating a blower device according to an embodiment.
  • the method can, for example, be based on the in Figure 1 shown control unit are executed.
  • the method has a step 800 of providing, in which an actuating signal for the actuating element is provided using a temperature signal representing a temperature of the fan motor in order to control a flow of cooling air through the fan motor.
  • the method has a step 802 of acquiring and a step 804 of setting.
  • step 802 of recording the temperature of the fan motor is recorded and mapped in the temperature signal.
  • step (04 of setting the control signal is read in and the control element is set according to the control signal.
  • the maximum possible efficiency is achieved in the first few minutes of operation.
  • the motor is only cooled if the motor temperature requires it.
  • the motor heating can be reduced or a lower amount of material can be achieved through better material utilization.
  • a high volume of cooling air is required, no cooling air flow is bypassed the motor.
  • bypass stage the bypass is actively closed completely.
  • the engine compartment becomes completely flows through and there is no direct sound radiation through the bypass openings.
  • the electrical power consumed can be regulated down accordingly.
  • the bypass is opened completely and the largest possible proportion of the fan air is discharged. As a result, the overall resistance is lowest, the overall efficiency is maximum and the dust absorption that can be achieved is greatest. After the engine has reached a temperature threshold or, for example, after 10 minutes, the bypass is gradually closed and the proportion of cooling air flowing through the engine increases.
  • the bypass can be completely closed. All air is then available to the engine as cooling air.
  • the vacuum cleaner is switched on while it is hot, the power setting is at MAX, the dust bag is full and a deep-pile carpet is being vacuumed, the bypasses can be completely closed so that all of the available air flow is directed through the motor and no cooling air through the bypass openings get lost.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Control Of Positive-Displacement Air Blowers (AREA)

Description

Die Erfindung betrifft eine Gebläsevorrichtung für einen Staubsauger, ein Verfahren zum Betreiben einer Gebläsevorrichtung, ein Steuergerät und einen Staubsauger.The invention relates to a blower device for a vacuum cleaner, a method for operating a blower device, a control device and a vacuum cleaner.

Aus der JP 2010 180705 A ist ein elektrisches Gebläse bekannt, das einen Bypass für eine Luftkühlung des Motors aufweist, wobei der Bypass schwerkraftbelastete Klappen umfasst, die von dem Luftstrom des Gebläses gegen die rückstellende Schwerkraft geöffnet werden.From the JP 2010 180705 A an electric blower is known which has a bypass for air cooling of the motor, the bypass comprising gravity-loaded flaps which are opened by the air flow of the blower against the restoring force of gravity.

Aus der US 5 216 778 A ist ein elektrischer Staubsauger bekannt, der einen Bypass für eine Luftkühlung des Motors aufweist, wobei der Bypass federbelastete Ventile umfasst, die von dem Luftstrom des Gebläses gegen die rückstellende Federkraft geöffnet werden.From the U.S. 5,216,778 A an electric vacuum cleaner is known which has a bypass for air cooling of the motor, the bypass comprising spring-loaded valves which are opened by the air flow of the blower against the restoring spring force.

Ein Staubsauger kann beispielsweise im Haushalt zur Reinigung eines Bodens verwendet werden. Der Erfindung stellt sich die Aufgabe, eine verbesserte Gebläsevorrichtung für einen Staubsauger, ein verbessertes Verfahren zum Betreiben einer Gebläsevorrichtung, ein verbessertes Steuergerät und einen verbesserten Staubsauger bereitzustellen.For example, a vacuum cleaner can be used in the home to clean a floor. The object of the invention is to provide an improved blower device for a vacuum cleaner, an improved method for operating a blower device, an improved control device and an improved vacuum cleaner.

Erfindungsgemäß wird diese Aufgabe durch eine Gebläsevorrichtung für einen Staubsauger, ein Verfahren zum Betreiben einer Gebläsevorrichtung, ein Steuergerät zum Betreiben einer Gebläsevorrichtung und einen Staubsager mit den Merkmalen der Hauptansprüche gelöst. Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den nachfolgenden Unteransprüchen.According to the invention, this object is achieved by a blower device for a vacuum cleaner, a method for operating a blower device, a control device for operating a blower device and a dust collector with the features of the main claims. Advantageous refinements and developments of the invention emerge from the following subclaims.

Bei einem Staubsauger kann ein angesaugter Luftstrom dazu verwendet werden, einen Gebläsemotor des Staubsaugers zu kühlen, indem der Luftstrom durch den Gebläsemotor geführt wird.In the case of a vacuum cleaner, an airflow that is sucked in can be used to cool a fan motor of the vacuum cleaner by guiding the airflow through the fan motor.

Wenn der Gebläsemotor nicht mit seiner Maximallast betrieben wird, ist eine geringere Kühlleistung erforderlich, als wenn der Gebläsemotor mit seiner Maximallast betrieben wird. Die Kühlleistung kann über den durch den Gebläsemotor geleiteten Luftstrom reguliert werden. Nicht zum Kühlen erforderlicher Luftstrom kann über einen Bypass am Gebläsemotor vorbei geleitet werden.If the fan motor is not operated at its maximum load, a lower cooling capacity is required than if the fan motor is operated at its maximum load. The cooling capacity can be regulated via the air flow directed through the fan motor. Air flow that is not required for cooling can be routed past the fan motor via a bypass.

Bei dem hier vorgestellten Ansatz ist in einem Kanal zwischen dem Gebläse und dem Gebläsemotor ein variabler Bypass angeordnet. Der Bypass wird durch eine Elektronik angesteuert.In the approach presented here, a variable bypass is arranged in a channel between the fan and the fan motor. The bypass is controlled by electronics.

Die mit der Erfindung erreichbaren Vorteile bestehen neben einer bedarfsgerechten Kühlleistung für den Gebläsemotor in einer erhöhten Effizienz des Gesamtsystems, da der Bypass einen geringeren Strömungswiderstand aufweist, als der Gebläsemotor.The advantages that can be achieved with the invention consist, in addition to a needs-based cooling capacity for the fan motor, in an increased efficiency of the overall system, since the bypass has a lower flow resistance than the fan motor.

Es wird eine Gebläsevorrichtung für einen Staubsauger vorgestellt. Die Gebläsevorrichtung weist die folgenden Merkmale auf:

  • einen Gebläsemotor, der mit einem Gebläse der Gebläsevorrichtung gekoppelt ist; und
  • einen steuerbaren Motorbypass, der zwischen dem Gebläse und dem Gebläsemotor angeordnet ist, wobei der Motorbypass zumindest ein Stellelement zum Einstellen eines Strömungsquerschnitts des Motorbypasses aufweist.
A blower device for a vacuum cleaner is presented. The blower device has the following features:
  • a fan motor coupled to a fan of the fan device; and
  • a controllable motor bypass which is arranged between the fan and the fan motor, the motor bypass having at least one adjusting element for setting a flow cross section of the motor bypass.

Unter einem Staubsauger kann ein Reinigungsgerät verstanden werden, bei dem Luft durch eine Ansaugöffnung des Staubsaugers eingesaugt wird. Der dazu erforderliche Unterdruck kann unter Verwendung des Gebläsemotors und des Gebläses erzeugt werden. Unter einem Gebläsemotor kann ein Elektromotor verstanden werden. Ein Gebläse kann ein drehbares Lüfterrad beziehungsweise Turbinenrad und eine feststehende Leiteinrichtung aufweisen. Ein Motorbypass kann ein alternativer Weg für einen Luftstrom des Gebläses an dem Gebläsemotor vorbei sein. Ein Stellelement kann beispielsweise ein Schieber zum Einstellen eines Strömungsquerschnitts des Motorbypasses sein.A vacuum cleaner can be understood to mean a cleaning device in which air is sucked in through a suction opening of the vacuum cleaner. The negative pressure required for this can be generated using the blower motor and the blower. A fan motor can be understood to mean an electric motor. A fan can have a rotatable fan wheel or turbine wheel and a stationary guide device. A motor bypass may be an alternative route for airflow from the fan past the fan motor. An adjusting element can, for example, be a slide for adjusting a flow cross section of the engine bypass.

Der Motorbypass kann zumindest eine durch das Stellelement einstellbare Bypassöffnung in einem Ausströmkanal des Gebläses aufweisen. Durch eine Position nahe am Gebläse kann Luft mit geringen Verlusten durch den Motorbypass ausströmen.The motor bypass can have at least one bypass opening, which can be adjusted by the adjusting element, in an outflow channel of the fan. Due to a position close to the fan, air can flow out through the motor bypass with low losses.

Das Stellelement kann tangential zu einer Rotationsachse des Gebläses beweglich gelagert sein. Das Stellelement kann eine Kulisse aufweisen, die einen Öffnungsquerschnitt der Bypassöffnung definiert. Der Schieber kann mit einer Drehbewegung bewegt werden.The adjusting element can be mounted so as to be movable tangentially to an axis of rotation of the fan. The adjusting element can have a gate which defines an opening cross section of the bypass opening. The slide can be moved with a rotary movement.

Das Stellelement kann axial zu der Rotationsachse beweglich gelagert sein. Eine Kante des Stellelements kann einen Öffnungsquerschnitt der Bypassöffnung definieren. Durch die axiale Beweglichkeit kann ein einfacher Motor zum Bewegen des Stellelements verwende werden.The adjusting element can be mounted so as to be axially movable in relation to the axis of rotation. An edge of the actuating element can define an opening cross section of the bypass opening. Due to the axial mobility, a simple motor can be used to move the adjusting element.

Das Stellelement kann radial zu der Rotationsachse beweglich gelagert sein. Das Stellelement kann in den Ausströmkanal eingefahren und ausgefahren werden.The adjusting element can be mounted so as to be movable radially to the axis of rotation. The adjusting element can be retracted and extended into the outflow channel.

Das Stellelement kann als Rampe ausgeformt sein, die in einer ersten Position den Strömungsquerschnitt des Motorbypasses verschließt und einen Strömungsquerschnitt des Ausströmkanals freigibt und in einer zweiten Position den Strömungsquerschnitt des Motorbypasses freigibt und einen Strömungsquerschnitt des Ausströmkanals verschließt. Die Rampe kann in Zwischenpositionen die Strömungsquerschnitte anteilig freigeben. Das Stellelement kann so als regelbare Zweiwegearmatur verwendet werden. Der Luftstrom durch den Motorbypass kann als Anteil eines Gesamtluftstroms eingestellt werden.The actuating element can be shaped as a ramp which closes the flow cross section of the engine bypass in a first position and releases a flow cross section of the exhaust duct and in a second position releases the flow cross section of the engine bypass and closes a flow cross section of the exhaust duct. The ramp can partially release the flow cross-sections in intermediate positions. The control element can thus be used as a controllable two-way valve. The air flow through the motor bypass can be adjusted as a proportion of a total air flow.

Die Gebläsevorrichtung kann ein Steuergerät gemäß dem hier vorgestellten Ansatz umfassen. Das Steuergerät kann mit einem Temperatursensor des Gebläsemotors und einem Antrieb des Stellelements verbunden sein. Das Steuergerät kann direkt die Regelung übernehmen.The blower device can comprise a control device according to the approach presented here. The control device can be connected to a temperature sensor of the fan motor and a drive of the actuating element. The control unit can take over the control directly.

Weiterhin wird ein Verfahren zum Betreiben der Gebläsevorrichtung vorgestellt, wobei in einem Schritt des Bereitstellens ein Stellsignal für das Stellelement unter Verwendung eines eine Temperatur des Gebläsemotors repräsentierenden Temperatursignals bereitgestellt wird, um einen Kühlluftstrom durch den Gebläsemotor zu steuern.Furthermore, a method for operating the blower device is presented, wherein in a step of providing an actuating signal for the actuating element using a temperature signal representing a temperature of the blower motor is provided in order to control a flow of cooling air through the blower motor.

Das Stellsignal kann ferner unter Verwendung eines eine Benutzungsdauer des Gebläsemotor repräsentierenden Zeitsignals bereitgestellt werden. Durch das Verwenden der Benutzungsdauer kann basierend auf Erfahrungswerten der Kühlluftstrom für den Gebläsemotor eingestellt werden. So kann bereits präventiv gekühlt werden, bevor die Temperatur ansteigt.The control signal can also be provided using a time signal representing a period of use of the fan motor. By using the duration of use, the cooling air flow for the fan motor can be set based on empirical values. This means that preventive cooling can take place before the temperature rises.

Der hier vorgestellte Ansatz schafft ferner ein Steuergerät, das ausgebildet ist, um die Schritte einer Variante eines hier vorgestellten Verfahrens in entsprechenden Einrichtungen durchzuführen, anzusteuern bzw. umzusetzen. Auch durch diese Ausführungsvariante der Erfindung in Form eines Steuergeräts kann die der Erfindung zugrunde liegende Aufgabe schnell und effizient gelöst werden.The approach presented here also creates a control device which is designed to carry out, control or implement the steps of a variant of a method presented here in corresponding devices. The object on which the invention is based can also be achieved quickly and efficiently by means of this embodiment variant of the invention in the form of a control device.

Das Steuergerät kann ausgebildet sein, um Eingangssignale einzulesen und unter Verwendung der Eingangssignale Ausgangssignale zu bestimmen und bereitzustellen. Ein Eingangssignal kann beispielsweise ein über eine Eingangsschnittstelle des Steuergeräts einlesbares Sensorsignal darstellen. Ein Ausgangssignal kann ein Steuersignal oder ein Datensignal darstellen, das an einer Ausgangsschnittstelle des Steuergeräts bereitgestellt werden kann. Das Steuergerät kann ausgebildet sein, um die Ausgangssignale unter Verwendung einer in Hardware oder Software umgesetzten Verarbeitungsvorschrift zu bestimmen. Beispielsweise kann das Steuergerät dazu eine Logikschaltung, einen integrierten Schaltkreis oder ein Softwaremodul umfassen und beispielsweise als ein diskretes Bauelement realisiert sein oder von einem diskreten Bauelement umfasst sein.The control device can be designed to read in input signals and to determine and provide output signals using the input signals. An input signal can, for example, represent a sensor signal that can be read in via an input interface of the control device. An output signal can represent a control signal or a data signal that can be provided at an output interface of the control device. The control device can be designed to determine the output signals using a processing rule implemented in hardware or software. For example, for this purpose the control device can comprise a logic circuit, an integrated circuit or a software module and, for example, be implemented as a discrete component or be comprised of a discrete component.

Ein entsprechender Staubsauger weist eine genannte Gebläsevorrichtung und ein genanntes Steuergerät auf, das ausgebildet ist, um das Stellsignal über eine Schnittstelle an das Stellelement der Gebläsevorrichtung bereitzustellen. Auf diese Weise kann der beschriebene Ansatz vorteilhaft bei einem Staubsauger eingesetzt werden.A corresponding vacuum cleaner has a named blower device and a named control device which is designed to provide the actuating signal to the actuating element of the blower device via an interface. In this way, the approach described can advantageously be used in a vacuum cleaner.

Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen rein schematisch dargestellt und wird nachfolgend näher beschrieben. Es zeigt

Figur 1
eine Darstellung einer Gebläsevorrichtung für einen Staubsauger gemäß einem Ausführungsbeispiel;
Figur 2
eine Darstellung eines in einem Ausströmkanal angeordneten Stellelements gemäß einem Ausführungsbeispiel;
Figur 3
eine Darstellung eines in einem Ausströmkanal angeordneten Stellelements gemäß einem Ausführungsbeispiel;
Figur 4
eine Schnittdarstellung eines Gebläses mit einem Motorbypass gemäß einem Ausführungsbeispiel;
Figur 5
eine Darstellung einer Gebläsevorrichtung mit einem Motorbypass gemäß einem Ausführungsbeispiel;
Figur 6
eine Schnittdarstellung eines Gebläses mit einem Motorbypass gemäß einem Ausführungsbeispiel;
Figur 7
eine Darstellung einer Gebläsevorrichtung mit einem Motorbypass gemäß einem Ausführungsbeispiel; und
Figur 8
ein Ablaufdiagramm eines Verfahrens zum Betreiben einer Gebläsevorrichtung gemäß einem Ausführungsbeispiel.
An embodiment of the invention is shown purely schematically in the drawings and is described in more detail below. It shows
Figure 1
a representation of a fan device for a vacuum cleaner according to an embodiment;
Figure 2
a representation of an adjusting element arranged in an outflow channel according to an exemplary embodiment;
Figure 3
a representation of an adjusting element arranged in an outflow channel according to an exemplary embodiment;
Figure 4
a sectional view of a fan with a motor bypass according to an embodiment;
Figure 5
an illustration of a blower device with a motor bypass according to an embodiment;
Figure 6
a sectional view of a fan with a motor bypass according to an embodiment;
Figure 7
an illustration of a blower device with a motor bypass according to an embodiment; and
Figure 8
a flowchart of a method for operating a blower device according to an embodiment.

Figur 1 zeigt eine Darstellung einer Gebläsevorrichtung 100 für einen Staubsauger gemäß einem Ausführungsbeispiel. Im betriebsbereiten Zustand kann die Gebläsevorrichtung 100 in einem Staubsauger verbaut sein. Dabei ist eine Hälfte der Gebläsevorrichtung 100 dargestellt. Die Gebläsevorrichtung 100 weist einen mit einem Gebläse 102 der Gebläsevorrichtung 100 gekoppelten Gebläsemotor 104 auf. Ein Ausströmkanal 106 des Gebläses 102 führt zu einer Einströmöffnung des Gebläsemotors 104, um dem Gebläsemotor 104 einen von dem Gebläse 102 im Betrieb erzeugten Kühlluftstrom zuzuführen. Der Kühlluftstrom entspricht im Staubsauger der durch eine Filtereinrichtung angesaugten Luft. Der Kühlluftstrom durchströmt den Gebläsemotor 104 und kühlt den Gebläsemotor 104. In dem Ausströmkanal 106 ist ein Motorbypass 108 angeordnet. Ein Strömungsquerschnitt des Motorbypasses 108 ist durch ein steuerbares Stellelement 110 einstellbar. Das Stellelement 110 wird von einer Antriebseinheit 112 ansprechend auf ein Stellsignal 114 bewegt. Figure 1 shows an illustration of a blower device 100 for a vacuum cleaner according to an embodiment. In the operationally ready state, the blower device 100 can be installed in a vacuum cleaner. One half of the blower device 100 is shown. The blower device 100 has a blower motor 104 coupled to a blower 102 of the blower device 100. An outflow channel 106 of the fan 102 leads to an inflow opening of the fan motor 104 in order to supply the fan motor 104 with a flow of cooling air generated by the fan 102 during operation. The cooling air flow in the vacuum cleaner corresponds to the air sucked in through a filter device. The cooling air flow flows through the fan motor 104 and cools the fan motor 104. A motor bypass 108 is arranged in the outflow channel 106. A flow cross section of the motor bypass 108 can be adjusted by a controllable adjusting element 110. The actuating element 110 is moved by a drive unit 112 in response to an actuating signal 114.

Das Stellsignal 114 wird von einem Steuergerät 116 zum Betreiben der Gebläsevorrichtung 100 bereitgestellt. Das Steuergerät 116 liest ein eine Temperatur des Gebläsemotors 104 repräsentierendes Temperatursignal 118 von einem Temperatursensor 120 des Gebläsemotors 104 ein und stellt das Stellsignal 114 in Abhängigkeit von der Temperatur bereit, um den Kühlluftstrom durch den Gebläsemotor 104 zu steuern.The control signal 114 is provided by a control unit 116 for operating the blower device 100. The control unit 116 reads a temperature signal 118 representing a temperature of the fan motor 104 from a temperature sensor 120 of the fan motor 104 and provides the actuating signal 114 as a function of the temperature in order to control the flow of cooling air through the fan motor 104.

Mit anderen Worten zeigt Figur 1 eine Gebläsevorrichtung 100 in Form eines Staubsaugergebläses. Die Gebläsevorrichtung 100 ist eine Kombination des Gebläsemotors 104 in Form einer Antriebsmaschine beziehungsweise eines Motors, welcher die zugeführte elektrische Leistung in ein Drehmoment und eine Drehzahl wandelt und dem als eine Arbeitsmaschine ausgeführten Gebläse 102, das das anliegende Drehmoment und die Drehzahl in einen aerodynamischen Unterdruck beziehungsweise eine Druckdifferenz und einen Durchfluss wandelt. Der Gesamtwirkungsgrad dieser Einheit setzt sich dann aus dem Produkt der beiden jeweils vorherrschenden Einzelwirkungsgrade zusammen.In other words shows Figure 1 a fan device 100 in the form of a vacuum cleaner fan. The blower device 100 is a combination of the blower motor 104 in the form of a drive machine or a motor, which converts the supplied electrical power into a torque and a speed, and the blower 102, which is designed as a work machine, which converts the applied torque and the speed into an aerodynamic negative pressure, respectively a pressure difference and converts a flow. The overall efficiency of this unit is then made up of the product of the two prevailing individual efficiencies.

Der Gebläsemotor 104 der Gebläsevorrichtung 100 ist beispielsweise ein Reihenschlussmotor (RSM) mit hoher Leistungsdichte. Der Gebläsemotor 104 wird aktiv gekühlt, damit die Verlustleistung in Form von Wärme aufgrund der hohen elektrischen Eingangsleistung ausreichend abgeführt wird. Durch die Fremdkühlung wird der Motor 104 vor Zerstörung geschützt und die Grenzen der zulässigen Wicklungstemperaturen werden eingehalten.The fan motor 104 of the fan device 100 is, for example, a series motor (RSM) with high power density. The fan motor 104 is actively cooled so that the power loss in the form of heat due to the high electrical input power is sufficiently dissipated. The external cooling protects the motor 104 from destruction and the limits of the permissible winding temperatures are maintained.

Der durch das Gebläse 102 erzeugte Luftstrom wird gemäß einem Ausführungsbeispiel durch das Innere des Gebläsemotors 104 geleitet, wo die Wärme sowohl vom rotierenden Anker als auch von der Statoroberfläche aufgenommen und abtransportiert wird.According to one exemplary embodiment, the air flow generated by the fan 102 is passed through the interior of the fan motor 104, where the heat is absorbed and transported away both by the rotating armature and by the stator surface.

Durch den beschriebenen Ansatz ist keine ständige Einleitung der vollständigen durch das Gebläse 102 erzeugten Luftströmung in den zu kühlenden Gebläsemotor 104 erforderlich, was sich als effizient und wirkungsgradsteigernd auswirkt. Die ergibt sich dadurch, dass der durch den Gebläsemotor 104 geleitete erhebliche Volumenstrom mit seiner hohen Strömungsgeschwindigkeit innerhalb kleiner geometrischer Abmessungen mehrfach seine Strömungsrichtung ändert. Bei jeder Änderung der Strömungsrichtung wirkt ein induzierter Strömungswiderstand, der zu einem Druckverlust führt. Die Strömung strömt dabei durch Engstellen des Gebläsemotors 104. Durch die Geschwindigkeitsänderungen der Luftströmung kommt es zu Druckschwankungen, Turbulenzen und Totwassergebieten, die den Wirkungsgrad weiter reduzieren. Alleine über dem Stator des Reihenschlussmotors (RSM) ergibt sich ein statischer Druckverlust von ca. 20 bis 30 mbar.Due to the approach described, it is not necessary to continuously introduce the complete air flow generated by the fan 102 into the fan motor 104 to be cooled, which has the effect of being efficient and increasing the efficiency. This results from the fact that the considerable volume flow passed through the fan motor 104 with its high flow velocity changes its flow direction several times within small geometric dimensions. With every change in the direction of flow, an induced flow resistance acts, which leads to a pressure loss. The flow flows through constrictions in the fan motor 104. The changes in speed of the air flow lead to pressure fluctuations, turbulence and dead water areas, which further reduce the efficiency. Just over the stator of the series motor (RSM) there is a static pressure loss of approx. 20 to 30 mbar.

Bei der Gebläsevorrichtung 100 ist die eingeleitete Kühlluft nicht unbedingt abhängig von dem Saugluftstrom, da sie nicht immer dem Saugluftstrom zu entsprechen braucht. Füllt sich der Staubbeutel oder wird der Staubsaugerschlauch geschlossen, steigt die Temperatur und Drehzahl des Motors stark an. Durch eine geeignete Regelung kann vermieden werden, dass sich der zur Verfügung stehende Kühlluftstrom zusätzlich noch verringert.In the case of the blower device 100, the cooling air introduced is not necessarily dependent on the suction air flow, since it does not always have to correspond to the suction air flow. If the dust bag fills up or the vacuum cleaner hose is closed, the temperature and speed of the motor rise sharply. A suitable regulation can prevent the available cooling air flow from being further reduced.

Eine wesentliche Steigerung des Gesamtwirkungsgrades der Gebläseeinheit kann durch die hier vorgestellte aktive Regelung des Kühlluftvolumens durch den Motor 104 erzielt werden. Das aktive Material des Motors 104 kann bei dem hier vorgestellten adaptiven Wärmemanagement besser ausgenutzt werden, da es nicht erforderlich ist, Reserven und Worst Case Szenarien vorzuhalten.A significant increase in the overall efficiency of the fan unit can be achieved by the active regulation of the cooling air volume by the motor 104, as presented here. The active material of the motor 104 can be better utilized in the adaptive thermal management presented here, since it is not necessary to maintain reserves and worst case scenarios.

Der durch das Gebläse 102 erzeugte Volumenstrom kann komplett durch den Motor 104 geleitet werden. Wenn beispielsweise aufgrund geringerer Leistungsvorgaben oder gesteigertem Motorwirkungsgrad eine komplette Durchströmung des Motors 104 mit dem vollständigen Volumenstrom nicht oder nicht mehr komplett erforderlich ist, so werden Bypässe 108 im Gebläsegehäuse aktiviert. Durch den Strömungswiderstand des Motors 104 wird ein Teil des erzeugten Volumenstromes durch Öffnungen vor dem Motor 104 aus dem Gehäuse 102 ausgeleitet. Der Gesamtwiderstand der Gebläseeinheit sinkt.The volume flow generated by the fan 102 can be passed completely through the motor 104. If, for example, due to lower performance requirements or increased motor efficiency, a complete flow through the motor 104 with the full volume flow is not or no longer necessary, bypasses 108 are activated in the fan housing. Due to the flow resistance of the motor 104, part of the volume flow generated is diverted out of the housing 102 through openings in front of the motor 104. The total resistance of the fan unit decreases.

Im Gegensatz zu fixen Bypässen ist der hier vorgestellte steuerbare Motorbypass 108 konstruktiv so ausgelegt, dass auch unter widrigen Bedingungen, wie Überspannung, starke Saugerdrosselung, verstopfte Filter oder hohe Leistungsstellung eine ausreichende Motorkühlung gewährleistet ist. Der Motorbypass 108 ist dem Gebläse 102 direkt nachgeschaltet, wodurch ein Großteil der Umlenkungsverluste vor dem Motor vermieden werden kann. Die Geometrie ist variabel und lässt Anpassungen zu. Der hier vorgestellte Motorbypass 108 kann für viele verschiedene Gebläsetypen optimiert werden.In contrast to fixed bypasses, the controllable motor bypass 108 presented here is designed in such a way that sufficient motor cooling is guaranteed even under adverse conditions, such as overvoltage, strong suction throttling, clogged filters or high power settings. The motor bypass 108 is connected directly downstream of the fan 102, as a result of which a large part of the deflection losses in front of the motor can be avoided. The geometry is variable and allows adjustments. The motor bypass 108 presented here can be optimized for many different types of blowers.

Prinzipiell wird der dem Motor 104 zugeführte und vom Gebläse 102 generierte Kühlluftstrom reguliert, also durch ein aktives, gestelltes beziehungsweise geregeltes mechanisches Stellelement 110 beeinflusst. Dies kann durch einen im Querschnitt variablen, also regelbaren, dem Motorgehäuse vorgelagerten Bypass 108 beziehungsweise Ausblasöffnung 108 erreicht werden. Beispielsweise liegt dieser Bypass 108 entweder als radialer Auslass in der Gebläsehaube oder als axialer Auslass oberhalb beziehungsweise integriert innerhalb des Diffusors, wodurch die verlustbehafteten, mehrfachen Strömungsumlenkungen bis zum Motorgehäuse eingespart werden können. Um eine bedarfsgerechte Kühlung des Motors 104 zu gewährleisten, ist eine Messung oder zumindest Abschätzung der aktuellen Motortemperatur dienlich.In principle, the cooling air flow supplied to the motor 104 and generated by the fan 102 is regulated, that is to say influenced by an active, set or regulated mechanical adjusting element 110. This can be achieved by means of a bypass 108 or blow-out opening 108 upstream of the motor housing, which is variable in cross section, that is to say controllable in cross section. For example, this bypass 108 is located either as a radial outlet in the fan hood or as an axial outlet above or integrated within the diffuser, so that the lossy, multiple flow deflections up to the motor housing can be saved. In order to ensure that the motor 104 is cooled as required, it is useful to measure or at least estimate the current motor temperature.

Die Verstellung beziehungsweise Regulierung der Bypassöffnung 108 erfolgt mittels Verstellung der Bypasskulissen 110. Dabei kommen die bekannten Möglichkeiten der Verstellung, wie rotatorisch oder translatorisch zur Anwendung über einen Hubmagnet 112, einen Motor 112 oder Bimetall. Die Regelung 116 kann mit dem vorhandenen Prozessor (MC) des Staubsaugers mitübernommen werden, beispielsweise als P oder PI-Regler. Eine Temperaturaufnahme 120 kann im Bereich des Wickelkopfes erfolgen.The adjustment or regulation of the bypass opening 108 takes place by adjusting the bypass link 110. The known possibilities of adjustment, such as rotational or translational, are used via a lifting magnet 112, a motor 112 or bimetal. The control 116 can also be taken over with the existing processor (MC) of the vacuum cleaner, for example as a P or PI controller. A temperature recording 120 can take place in the area of the winding head.

Figur 2 zeigt eine Darstellung eines in einem Ausströmkanal 106 angeordneten Stellelements 110 gemäß einem Ausführungsbeispiel. Das Stellelement 110 entspricht dabei im Wesentlichen dem Stellelement in Figur 1. Das Stellelement 110 weist hier die Form einer Rampe auf, die dazu ausgebildet ist, den Kühlluftstrom 200 vom Gebläse strömungsgünstig seitlich abzulenken. Dabei versperrt das Stellelement 110 den Ausströmkanal 106 vollständig, wenn es in einer vollständig ausgefahrenen Position im Ausströmkanal 106 angeordnet ist. Der Kühlluftstrom 200 strömt dann durch eine Aussparung 202 im Ausströmkanal 106 aus. Wenn die Rampe 110 eingefahren ist, arbeitet das Gebläse mit maximaler Effizienz. Figure 2 shows an illustration of an actuating element 110 arranged in an outflow channel 106 according to an exemplary embodiment. The adjusting element 110 corresponds essentially to the adjusting element in FIG Figure 1 . The actuating element 110 here has the shape of a ramp which is designed to deflect the cooling air flow 200 from the fan to the side in a streamlined manner. In this case, the adjusting element 110 completely blocks the outflow channel 106 when it is arranged in a completely extended position in the outflow channel 106. The cooling air flow 200 then flows through a recess 202 in the Outflow channel 106 from. When the ramp 110 is retracted, the fan operates at maximum efficiency.

Der Ausströmkanal 106 und das Stellelement 110 sind hier im Wesentlichen so ausgerichtet, wie sie in Figur 1 dargestellt sind.The outflow channel 106 and the adjusting element 110 are essentially oriented here as they are in FIG Figure 1 are shown.

Figur 3 zeigt eine Darstellung eines in einem Ausströmkanal 106 angeordneten Stellelements 110 gemäß einem Ausführungsbeispiel. Das Stellelement 110 entspricht dabei im Wesentlichen dem Stellelement in Figur 2. Das Stellelement 110 ist hier in einer vollständig zurückgezogenen Position angeordnet. Damit verschließt das Stellelement 110 die Aussparung 202 vollständig und der Kühlluftstrom 200 strömt entlang des vollständig freigegebenen Ausströmkanals 106 zu dem Gebläsemotor. Wenn die Rampe 110 aus dem Ausströmkanal herausgefahren ist, erhält der Motor die maximale Kühlleistung. Figure 3 shows an illustration of an actuating element 110 arranged in an outflow channel 106 according to an exemplary embodiment. The adjusting element 110 corresponds essentially to the adjusting element in FIG Figure 2 . The adjusting element 110 is arranged here in a completely retracted position. The actuating element 110 thus completely closes the recess 202 and the cooling air flow 200 flows along the completely released outflow channel 106 to the fan motor. When the ramp 110 has moved out of the exhaust duct, the motor receives the maximum cooling capacity.

Wenn das Stellelement 110 in einer Zwischenposition angeordnet ist, sind der Ausströmkanal 106 und die Aussparung 202 teilweise freigegeben. Der Kühlluftstrom 200 wird durch das Stellelement 110 geteilt. Ein Teil strömt weiter zum Gebläsemotor und ein Teil entweicht durch die Aussparung 202 in den Motorbypass.When the adjusting element 110 is arranged in an intermediate position, the outflow channel 106 and the recess 202 are partially released. The cooling air flow 200 is divided by the actuating element 110. A part flows on to the fan motor and a part escapes through the recess 202 into the motor bypass.

Mit anderen Worten werden im Regelbetrieb zunächst die Rampen 110 aus dem Gebläse in axialer Richtung zum B-Lagerschild herausgefahren. Sie schließen die axiale Öffnung 202 bündig ab und leiten den Luftstrom 200 in das Motorgehäuse zur Kühlung ein. Soll eine maximale Wirkung der Bypässe ermöglicht werden, fahren die Rampen 110 in das Gehäuse axial in Richtung zum A-Lagerschild ein und verschließen dabei den radialen Luftkanal 106 zum Motor und lenken formgegeben gleichzeitig die Luft 200 in axialer Richtung um und aus.In other words, in normal operation, the ramps 110 are first moved out of the fan in the axial direction towards the B-end shield. They close off the axial opening 202 flush and direct the air flow 200 into the motor housing for cooling. If a maximum effect of the bypasses is to be made possible, the ramps 110 move axially into the housing in the direction of the A-bearing plate and thereby close the radial air duct 106 to the motor and at the same time deflect the air 200 in the axial direction and out.

Die Rampen 110 werden in Abhängigkeit von der ermittelten Motortemperatur in axialer Richtung in die Öffnungen 202 des Topfes eingetaucht, wobei dann der Bypass maximal ist, oder ausgetaucht, wobei dann der axiale Auslass 202 versperrt ist. Die gesamte Saugluft 200 steht dann als Kühlluft zur Verfügung und wird in das Motorgehäuse gelenkt.The ramps 110 are immersed in the axial direction into the openings 202 of the pot as a function of the determined motor temperature, the bypass then being at a maximum, or immersed, the axial outlet 202 then being blocked. The entire suction air 200 is then available as cooling air and is directed into the motor housing.

Figur 4 zeigt eine Schnittdarstellung eines Gebläses 102 mit einem Motorbypass 108 gemäß einem Ausführungsbeispiel. Das Gebläse 102 entspricht im Wesentlichen dem Gebläse in Figur 1. Das Gebläse 102 weist ein Gehäuse 400 auf, in dem eine Welle 402 des Gebläses 102 gelagert ist. Das Gehäuse 400 umschließt ein Lüfterrad 404 des Gebläses 102. Das Gehäuse 400 geht in den Ausströmkanal 106 über. Das Gehäuse 400 weist entlang seines Umfangs im Bereich des Ausströmkanals 106 beziehungsweise der Haube eine Reihe von Durchbrüchen 202 beziehungsweise Bypassfenster 202 auf. Figure 4 shows a sectional illustration of a blower 102 with a motor bypass 108 according to an embodiment. The fan 102 essentially corresponds to the fan in FIG Figure 1 . The fan 102 has a housing 400 in which a shaft 402 of the fan 102 is mounted. The housing 400 encloses a fan wheel 404 of the blower 102. The housing 400 merges into the outflow channel 106. The housing 400 has a number of openings 202 or bypass windows 202 along its circumference in the area of the outflow channel 106 or the hood.

Das Stellelement 110 ist hier als Schieber ringförmig um eine Außenseite des Gehäuses 400 angeordnet und axial zu der Welle 402 verschiebbar gelagert. Über eine Position des Stellelements 110 wird ein Öffnungsquerschnitt beziehungsweise eine wirksame Bypassfläche der Durchbrüche 202 eingestellt.The actuating element 110 is here arranged as a slide in a ring around an outer side of the housing 400 and is mounted so as to be axially displaceable relative to the shaft 402. About a position of the Adjusting element 110, an opening cross section or an effective bypass area of the openings 202 is set.

Mit anderen Worten ist eine Schubverstellung gezeigt.In other words, a thrust adjustment is shown.

Figur 5 zeigt eine Darstellung einer Gebläsevorrichtung 100 mit einem Motorbypass 108 gemäß einem Ausführungsbeispiel. Die Gebläsevorrichtung 100 entspricht dabei im Wesentlichen der Gebläsevorrichtung in Figur 4. Das Stellelement 110 ist hier so angeordnet, dass die Durchbrüche 202 halb verschlossen sind. Damit steht nur der halbe Öffnungsquerschnitt 500 zum Durchströmen in den Motorbypass 108 zu Verfügung. Figure 5 shows an illustration of a blower device 100 with a motor bypass 108 according to an embodiment. The blower device 100 corresponds essentially to the blower device in FIG Figure 4 . The adjusting element 110 is arranged here in such a way that the openings 202 are half closed. This means that only half the opening cross section 500 is available for flow into the motor bypass 108.

Figur 6 zeigt eine Schnittdarstellung eines Gebläses 102 mit einem Motorbypass 108 gemäß einem Ausführungsbeispiel. Das Gebläse 102 entspricht im Wesentlichen dem Gebläse in den Figuren 4 und 5. Im Gegensatz dazu ist das Stellelement 110 hier am Gehäuse 400 drehbar gelagert. Das Stellelement 110 weist Durchbrüche 600 auf, die mit den Durchbrüchen 202 im Ausströmkanal zur Deckung gebracht werden können. Durch eine Drehung des Stellelements 110 kann der resultierende Strömungsquerschnitt eingestellt werden. Figure 6 shows a sectional illustration of a blower 102 with a motor bypass 108 according to an embodiment. The fan 102 essentially corresponds to the fan in FIG Figures 4 and 5 . In contrast to this, the actuating element 110 is rotatably mounted on the housing 400 here. The adjusting element 110 has openings 600 which can be brought into congruence with the openings 202 in the outflow channel. The resulting flow cross section can be adjusted by rotating the adjusting element 110.

Mit anderen Worten ist eine Bypassverstellung in der Haube 400 über eine Drehverstellung gezeigt.In other words, a bypass adjustment is shown in the hood 400 via a rotary adjustment.

Figur 7 zeigt eine Darstellung einer Gebläsevorrichtung 100 mit einem Motorbypass 108 gemäß einem Ausführungsbeispiel. Die Gebläsevorrichtung 100 entspricht im Wesentlichen der Darstellung in Figur 6. Hier ist das Stellelement 110 gegenüber den Durchbrüchen 202 verdreht, sodass die Durchbrüche 600 im Stellelement 110 die Durchbrüche 202 nur teilweise überdecken. Dadurch ist der Strömungsquerschnitt 500 in den Motorbypass 108 reduziert. Figure 7 shows an illustration of a blower device 100 with a motor bypass 108 according to an embodiment. The blower device 100 essentially corresponds to the illustration in FIG Figure 6 . Here, the adjusting element 110 is rotated with respect to the openings 202, so that the openings 600 in the adjusting element 110 only partially cover the openings 202. As a result, the flow cross section 500 into the engine bypass 108 is reduced.

In einem Ausführungsbeispiel wird statt eines Hubes im Sinne eines Ein- und Austretens von Luftführungsrampen in axialer Richtung wie in den Figuren 2 und 3 ein Drehschieber 110 an der Gebläsehaube 400 verwendet, um die Luft geregelt auszulenken beziehungsweise nach dem Schließen in den Motor zur Kühlung lenken. Dazu befinden sich am Umfang der Haube 400 ausgestanzte Fenster 202, durch die die Gebläseluft direkt in den Gebläseraum des Saugers ausgeleitet werden kann. Soll die Luft zur Kühlung in den Motor geleitet werden, so kann der Ring 110 die Durchtrittsfenster 202 in der Haube 400 blockieren, indem er wie in den Figuren 4 und 5 in axialer Richtung eintaucht und die Durchtrittsfenster 202 der Haube 400 im Querschnitt 500 verkleinert oder wie in den Figuren 6 und 7 im Umfang ebenfalls Fenster 600 besitzt und durch Verdrehen den Querschnitt 500 der Durchtrittsfenster 202 in der Haube 400 verkleinert beziehungsweise verschließt.In one embodiment, instead of a stroke in the sense of an entry and exit of air guide ramps in the axial direction as in the Figures 2 and 3 a rotary valve 110 is used on the fan cover 400 to deflect the air in a controlled manner or, after closing, to direct it into the motor for cooling. For this purpose, there are punched-out windows 202 on the circumference of the hood 400, through which the blower air can be discharged directly into the blower chamber of the vacuum cleaner. If the air is to be conducted into the engine for cooling, the ring 110 can block the passage window 202 in the hood 400 by, as in the Figures 4 and 5 immersed in the axial direction and the passage window 202 of the hood 400 reduced in cross section 500 or as in the Figures 6 and 7th also has windows 600 in the circumference and, by turning, reduces or closes the cross section 500 of the passage window 202 in the hood 400.

Figur 8 zeigt ein Ablaufdiagramm eines Verfahrens zum Betreiben einer Gebläsevorrichtung gemäß einem Ausführungsbeispiel. Das Verfahren kann beispielsweise auf dem in Figur 1 dargestellten Steuergerät ausgeführt werden. Das Verfahren weist einen Schritt 800 des Bereitstellens auf, in dem ein Stellsignal für das Stellelement unter Verwendung eines eine Temperatur des Gebläsemotors repräsentierenden Temperatursignals bereitgestellt wird, um einen Kühlluftstrom durch den Gebläsemotor zu steuern. Figure 8 shows a flow chart of a method for operating a blower device according to an embodiment. The method can, for example, be based on the in Figure 1 shown control unit are executed. The method has a step 800 of providing, in which an actuating signal for the actuating element is provided using a temperature signal representing a temperature of the fan motor in order to control a flow of cooling air through the fan motor.

In einem Ausführungsbeispiel weist das Verfahren einen Schritt 802 des Erfassens und einen Schritt 804 des Stellens auf. Im Schritt 802 des Erfassens wird die Temperatur des Gebläsemotors erfasst und in dem Temperatursignal abgebildet. Im Schritt (04 des Stellens wird das Stellsignal eingelesen und das Stellelement entsprechend des Stellsignals gestellt.In one exemplary embodiment, the method has a step 802 of acquiring and a step 804 of setting. In step 802 of recording, the temperature of the fan motor is recorded and mapped in the temperature signal. In step (04 of setting, the control signal is read in and the control element is set according to the control signal.

Mit anderen Worten wird ein thermisches Management von Staubsaugergebläsen mittels einer aktiven Bypass-Regelung vorgeschlagen. Dabei erfolgt eine variable Regelung des Luftstroms zur Motorkühlung in Abhängigkeit der Motortemperatur.In other words, a thermal management of vacuum cleaner fans by means of an active bypass control is proposed. A variable regulation of the air flow for the engine cooling takes place depending on the engine temperature.

Durch den hier vorgestellten Ansatz kann eine Erhöhung des Wirkungsgrades durch adaptive, bedarfsgerechte Motorkühlung und damit verbundener Luftwiderstandsreduktion erreicht werden. Die aktive Regelung und Adaption des Kühlluftanteiles des Motors erfolgt je nach Motortemperatur und Lastfall, wie beispielsweise Phasenanschnitt mit geringerer Leistung, Staubbeutelfüllgrad, Filterverschmutzung, Luftwiderstand durch verschiedene Bodenbeläge, Spannungsabfallkompensation oder momentaner Motortemperatur. Dadurch ergibt sich eine verbesserte Bypasswirksamkeit durch Verlusteinsparungen in der Luftumlenkung. Durch den ansteuerbaren Motorbypass ist eine optimale Anpassung auch bei verschiedenen Gebläse(leistungs-)klassen mit gleichem mechanischen Aufbau möglich.With the approach presented here, an increase in efficiency can be achieved through adaptive, needs-based engine cooling and the associated reduction in air resistance. The active regulation and adaptation of the cooling air proportion of the motor takes place depending on the motor temperature and load case, such as phase control with lower power, dust bag filling level, filter contamination, air resistance due to different floor coverings, voltage drop compensation or current motor temperature. This results in an improved bypass effectiveness through savings in losses in the air deflection. Thanks to the controllable motor bypass, optimal adaptation is also possible with different fan (power) classes with the same mechanical structure.

In den ersten Minuten des Betriebs wird ein maximal möglicher Wirkungsgrad erreicht. Im weiteren Betrieb erfolgt nur dann eine Kühlung des Motors, wenn es die Motortemperatur erfordert. Durch die regelbaren Bypässe kann die Motorerwärmung reduziert oder ein geringerer Materialeinsatz durch bessere Materialausnutzung erzielt werden. Wenn ein hohes Kühlluftvolumen erforderlich ist, wird kein Kühlluftstrom am Motor vorbeigeleitet. Durch die in weiten Teilen vor dem Motor ausgelenkte Saugluft (=Kühlluft) wird die innere Verschmutzung des Motors durch angelagerte Schmutzpartikel, die durch den Staubbeutel nicht gefiltert werden, reduziert oder sogar ausgeschlossen. Insbesondere die Lagerverschmutzung und damit verbundene Lagerausfälle könnten reduziert werden. Mögliche Gebläseausfälle durch aufgesaugtes Wasser können weitgehend vermieden werden, solange die Bypässe vollständig aufgefahren sind und eine Durchströmung des Motors verhindert ist.The maximum possible efficiency is achieved in the first few minutes of operation. During further operation, the motor is only cooled if the motor temperature requires it. With the adjustable bypasses, the motor heating can be reduced or a lower amount of material can be achieved through better material utilization. If a high volume of cooling air is required, no cooling air flow is bypassed the motor. The suction air (= cooling air), which is largely deflected in front of the engine, reduces or even eliminates the internal contamination of the engine through accumulated dirt particles that are not filtered by the dust bag. In particular, bearing contamination and the associated bearing failures could be reduced. Possible blower failures due to sucked up water can largely be avoided as long as the bypasses are fully opened and a flow through the motor is prevented.

Durch den hier vorgestellten Ansatz kann eine verbesserte Akustik erreicht werden. In einer "Silence-Stufe" wird der Bypass aktiv vollständig geschlossen. Der Motorraum wird völlig durchströmt und es besteht keine direkte Schallabstrahlung durch die Bypassöffnungen. Gleichzeitig kann die aufgenommene elektrische Leistung entsprechend heruntergeregelt werden.With the approach presented here, improved acoustics can be achieved. In a "silence stage", the bypass is actively closed completely. The engine compartment becomes completely flows through and there is no direct sound radiation through the bypass openings. At the same time, the electrical power consumed can be regulated down accordingly.

Wenn der Staubsauger in kaltem Zustand zugeschaltet wird, wird der Bypass komplett geöffnet und der größtmögliche Anteil der Gebläseluft wird ausgeleitet. Dadurch ist der Gesamtwiderstand am geringsten, der Gesamtwirkungsgrad maximal und die erzielbare Staubaufnahme ist am größten. Nach Erreichen einer Temperaturschwelle des Motors oder beispielsweise nach 10 Minuten wird der Bypass sukzessive geschlossen und der Anteil der motordurchströmenden Kühlluft wird größer.If the vacuum cleaner is switched on while it is cold, the bypass is opened completely and the largest possible proportion of the fan air is discharged. As a result, the overall resistance is lowest, the overall efficiency is maximum and the dust absorption that can be achieved is greatest. After the engine has reached a temperature threshold or, for example, after 10 minutes, the bypass is gradually closed and the proportion of cooling air flowing through the engine increases.

Nach Erreichen einer weiteren, höheren Temperaturschwelle oder beispielsweise nach weiteren 10 Minuten Saugbetrieb kann der Bypass vollständig geschlossen werden. Alle Luft steht dann dem Motor als Kühlluft zur Verfügung.After reaching a further, higher temperature threshold or, for example, after a further 10 minutes of suction operation, the bypass can be completely closed. All air is then available to the engine as cooling air.

Wenn der Staubsauger in heißem Zustand eingeschaltet wird, die Leistungsstellung auf MAX steht, der Staubbeutel ist voll und ein hochfloriger Teppich gesaugt wird können die Bypässe ganz geschlossen werden, damit der gesamte zur Verfügung stehende Luftstrom durch den Motor geleitet wird und keine Kühlluft durch die Bypassöffnungen verloren geht.If the vacuum cleaner is switched on while it is hot, the power setting is at MAX, the dust bag is full and a deep-pile carpet is being vacuumed, the bypasses can be completely closed so that all of the available air flow is directed through the motor and no cooling air through the bypass openings get lost.

Wenn die "Silence-Stufe" aktiviert wird, wird der Bypass komplett geschlossen und die Leistungsaufnahme wird heruntergeregelt. Dadurch verbessert sich die Akustik.When the "silence level" is activated, the bypass is closed completely and the power consumption is reduced. This improves the acoustics.

Claims (11)

  1. Blower device (100) for a vacuum cleaner, the blower device (100) having the following features:
    a fan (102) and a fan motor (104), the fan motor (104) being coupled to the fan (102) of the blower device (100);
    characterised by
    a controllable motor bypass (108) which is arranged between the fan (102) and the fan motor (104), the motor bypass (108) having at least one adjusting element (110) for adjusting a flow cross section (500) of the motor bypass (108).
  2. Blower device (100) according to claim 1, wherein the motor bypass (108) has at least one bypass opening (202) which can be adjusted by the adjusting element (110) in an outflow channel (106) of the fan (102).
  3. Blower device (100) according to either of the preceding claims, wherein the adjusting element (110) is mounted so as to be movable tangentially to an axis of rotation of the fan (102).
  4. Blower device (100) according to either claim 1 or claim 2, wherein the adjusting element (110) is mounted so as to be movable axially to an axis of rotation of the fan (102).
  5. Blower device (100) according to either claim 1 or claim 2, wherein the adjusting element (110) is mounted so as to be movable radially to an axis of rotation of the fan (102).
  6. Blower device (100) according to any of the preceding claims, wherein the adjusting element (110) is in the form of a ramp which, in a first position, closes the flow cross section (500) of the motor bypass (108) and opens a flow cross section of the outflow channel (106) and, in a second position, opens the flow cross section (500) of the motor bypass (108) and closes a flow cross section of the outflow channel (106), wherein the ramp (110) partially opens the flow cross sections in intermediate positions.
  7. Blower device (100) according to any of the preceding claims, comprising a controller (116) according to claim 10 for operating the blower device (100), wherein the controller (116) is connected to a temperature sensor (120) of the fan motor (104) and a drive (112) of the adjusting element (110).
  8. Method for operating a blower device (100) according to any of claims 1 to 7, characterised in that, in a provision step (800), an adjusting signal (114) for the adjusting element (110) is provided using a temperature signal (118) representing a temperature of the fan motor (104) in order to control a cooling air flow (200) through the fan motor (104).
  9. Method according to claim 8, wherein, in the provision step (800), the adjusting signal (114) is also provided using a time signal representing a period of use of the fan motor (104) .
  10. Controller (116) which is designed to carry out the steps of the method according to either of the preceding claims 8 and 9.
  11. Vacuum cleaner comprising a blower device (100) according to any of the preceding claims 1-7 and a controller (116) according to claim 10, which controller is designed to provide the adjusting element (110) of the blower device (100) with the adjusting signal (114) via an interface.
EP17170956.1A 2016-06-15 2017-05-15 Air blowing device for a vacuum cleaner, method for operating an air blowing device, control device and vacuum cleaner Active EP3257421B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102016110923.1A DE102016110923A1 (en) 2016-06-15 2016-06-15 Blower device for a vacuum cleaner, method for operating a blower device, control unit and vacuum cleaner

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EP3257421A2 EP3257421A2 (en) 2017-12-20
EP3257421A3 EP3257421A3 (en) 2018-04-18
EP3257421B1 true EP3257421B1 (en) 2021-08-18

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Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2703175C2 (en) * 1977-01-26 1979-03-01 Siemens Ag, 1000 Berlin Und 8000 Muenchen Blower unit for a vacuum cleaner
US5216778A (en) * 1989-06-30 1993-06-08 Hitachi, Ltd. Vacuum cleaner
DE10129596A1 (en) * 2000-07-21 2002-01-31 Vorwerk Co Interholding vacuum cleaner
JP4635563B2 (en) * 2004-11-04 2011-02-23 パナソニック株式会社 Electric blower
JP2010180705A (en) * 2009-02-03 2010-08-19 Panasonic Corp Electric blower and vacuum cleaner using the same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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