EP4053323A1 - Lave-linge pourvu de système de pompe de transvasement et son procédé de fonctionnement - Google Patents

Lave-linge pourvu de système de pompe de transvasement et son procédé de fonctionnement Download PDF

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Publication number
EP4053323A1
EP4053323A1 EP22154986.8A EP22154986A EP4053323A1 EP 4053323 A1 EP4053323 A1 EP 4053323A1 EP 22154986 A EP22154986 A EP 22154986A EP 4053323 A1 EP4053323 A1 EP 4053323A1
Authority
EP
European Patent Office
Prior art keywords
pump
over
pressure chamber
motor
washing machine
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.)
Pending
Application number
EP22154986.8A
Other languages
German (de)
English (en)
Inventor
Kevin Hahn
Marvin Jacob
Dirk MISCHKE
Raymond Römer
Stefan Wetzel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BSH Hausgeraete GmbH
Original Assignee
BSH Hausgeraete GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BSH Hausgeraete GmbH filed Critical BSH Hausgeraete GmbH
Publication of EP4053323A1 publication Critical patent/EP4053323A1/fr
Pending legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/10—Filtering arrangements
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/083—Liquid discharge or recirculation arrangements
    • D06F39/085—Arrangements or adaptations of pumps
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/14—Supply, recirculation or draining of washing liquid
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • D06F33/43—Control of cleaning or disinfection of washing machine parts, e.g. of tubs

Definitions

  • the invention relates to a washing machine with a circulation system and a method for operating it.
  • the invention relates in particular to a washing machine with a tub, a drum arranged therein for receiving items of laundry (laundry), a heating device, a drive motor, a water supply device and a control or regulating device, the pumping system having a pump housing with a pumping-out connection, a pumping-out connection and a suction nozzle, wherein a pump-out motor, a pump-over motor, and an openable screw cap, on which a substantially cylindrical filter insert that can be removed from the washing machine and that has at least one opening for the passage of an aqueous liquid along its circumference, are arranged on the pump housing are such that the pump housing comprises a substantially cylindrical suction chamber, a pump-down pressure chamber and a pump-over pressure chamber, and wherein the pump-out motor is arranged to pump an aqueous liquid from the substantially cylindrical suction chamber via the pump-down pressure chamber mmer and to transport the pump
  • washing machines There are more and more washing machines that allow a higher load of laundry items.
  • modern large-volume washing machines are often equipped with a pumping system that conveys the washing suds better and, above all, faster into the laundry.
  • the washing suds can be rinsed out more quickly and efficiently in a rinsing phase.
  • new washing machine label requirements EN19
  • large-capacity washing machines are now equipped with a pump-over system.
  • low wash suds levels can be achieved in the washing machine or in the suds container for the washing process, so that a wash suds can be quickly brought to a desired washing process temperature even with low water levels in the suds container and thus with a low heating output of an existing heating device, in order to meet the label requirements, e.g of energy consumption to achieve.
  • washing suds can be put into the laundry even at liquid levels in the suds container at which watering of the laundry would not be possible without a circulation system because the laundry drum at is not yet immersed in the "dead liquor" (suds in the suds container) at such a low level of liquid, and it is therefore not possible for the laundry to be watered by a diffusion process from the outside inwards into the laundry.
  • the publication DE 10 2016 210 320 A1 describes a method for operating a washing machine with a tub, a drum arranged therein for receiving items of laundry, a drive motor, at least one water supply device, in general for supplying water into the tub, a pumping system with a tub pump and a pumping line, and a control device, in which at least one operating program is stored.
  • the publication DE 10 2018 206 364 A1 describes a household appliance for the care of items of laundry, with a suds container in which a laundry drum designed to hold the items of laundry is arranged, with a pump system which includes a circulation pump, by means of which a fluid can be conveyed from a lower region of the suds container.
  • the pumping system includes a drainage pump, with the circulation pump and the drainage pump being arranged in a common pump housing of the pumping system.
  • an inlet-side chamber of the pump housing has a closure element, with the filter device being accessible for maintenance and/or being removable from the chamber after the closure element has been opened.
  • the publication DE 10 2016 212 478 A1 describes a laundry care appliance with a pump-over system comprising a suction chamber, the pump having a filter and/or foreign body trap for filtering impurities from the washing liquid, and the suction chamber having a filter insertion opening for inserting the filter into the suction chamber.
  • the filter has a filter insert, which is arranged inside the suction chamber, and a filter cover, which is designed to seal the filter insertion opening in a fluid-tight manner.
  • Circulation pump systems also known as circulation pump systems, usually consist of a pump (drainage pump) and a circulation pump (also called circulation pump), which are usually combined by a common pump housing.
  • the pump housing is usually designed in such a way that both pumps use a common suction chamber in which either a foreign body trap or a fluff filter is integrated to filter out foreign bodies and/or fluff from the flow on the suction side and to enable access to some of the impellers of the pump-out motor and pump-over motor so that potential impeller blockages caused by foreign bodies can be eliminated by the customer.
  • the pump is usually arranged in an axial direction, while the circulating pump is usually placed radially.
  • the geometric arrangement of the two pumps on the common suction chamber is preferably designed in such a way that access to the impeller of the pump-out motor is provided. This access should be able to be sealed very well.
  • the axially arranged pump housing is axially closed and sealed by a screw cap. Due to the axial screw connection, the filter insert integrated in the suction chamber is also axially prestressed at the same time in such a way that a good seal of the pump-out pressure chamber from the suction chamber can be achieved with regard to the pump-out.
  • This seal must be functionally reliable, especially for the pump, since there are VDE requirements specifically for the pump with regard to flow rate and maintenance of flow rate over the service life of the washing machine.
  • the radially arranged pressure chamber of the circulation pump (recirculation pressure chamber) must be sealed off from the suction chamber. This is because there is generally a gap between a removable filter insert and the pump housing, even if an attempt is made during manufacture to keep this gap as small as possible. This gap is a result of the manufacturing of the pump housing and filter cartridge, which are typically made by injection molding where certain tolerances are specified. If such a seal is not implemented, this can lead to a significant leakage flow, which can make it very difficult or even impossible to control a washing program and in particular to control the circulation of aqueous liquid in a pump-over system. Namely, the flow of aqueous liquid should preferably be at a certain speed and at a certain angle into the drum.
  • the object of the present invention was to provide a washing machine with a pumping system, which is particularly suitable for large loads of laundry items, with improved control of the pumping system allowing better perfusion of the laundry items with an aqueous liquid, in particular suds, can be achieved and improved cleaning of laundry items can be carried out.
  • washing machine and a method for operating this washing machine with the features of the corresponding independent patent claims.
  • Preferred embodiments of the washing machine according to the invention are listed in the respective dependent patent claims.
  • Preferred embodiments of the method according to the invention correspond to preferred embodiments of the washing machine according to the invention and vice versa, even if this is not explicitly stated here.
  • the invention relates to a washing machine with a tub, a drum arranged therein for receiving items of laundry, a heating device, a drive motor, a water supply device and a control or regulating device
  • the pumping system comprising a pump housing with a pumping-out connection, a pumping-out connection and an intake connection , wherein a pump-out motor, a pump-over motor, and an openable screw cap, on which a filter insert that can be removed from the washing machine is attached and has at least one opening for the passage of an aqueous liquid along its circumference, are arranged on the pump housing, so that the pump housing a substantially cylindrical suction chamber, a pump-out pressure chamber and a pump-over pressure chamber, and wherein the pump-down motor is arranged to pump an aqueous liquid from the substantially cylindrical suction chamber via the pump-out pressure chamber and the pump-out port into a pump-out line and the pump-around motor is arranged to convey the aqueous liquid from the substantially cylindrical suction chamber through the filter
  • the at least one opening along the circumference of the filter insert is therefore the pump-over opening here.
  • the filter cartridge is generally designed in such a way that it has three openings for the passage of an aqueous liquid, namely one suction-side and two pressure-side openings to feed the circulation pump and the drain pump, i.e. an inlet from the suction chamber and two outlets or outlets to the pressure chambers .
  • the pump housing is generally almost cylindrical, apart from draft angles, the outside geometry of the filter insert does not necessarily have to be cylindrical.
  • a pump housing is used that contains the pump-out and pump-over functions. This enables a particularly compact construction of the pumping system and a comparatively small amount of space.
  • a housing can be produced particularly well by plastic injection molding.
  • a filter insert that can be removed from the washing machine can be separably attached to the screw cap that is to be opened.
  • the closure and filter insert it is possible for the closure and filter insert to be designed in one piece and, for example, to be produced as a one-piece injection molded part, in which case it may be difficult or even impossible to seal the pumping and pumping-out pressure chambers at the same time because the filter insert molded on is screwed on when the closure cap is screwed on then has to turn as well, so that this labyrinth seal cannot be used as a matter of principle.
  • the aqueous liquid is conveyed from the essentially cylindrical suction chamber via the pumping pressure chamber and the pumping connection into a pumping line, which in turn is connected to an inlet in the drum, so that the pumped aqueous liquid is ultimately returned to the laundry items in the drum reached.
  • the control or regulating device is generally set up to cause the aqueous liquid to be pumped around or pumped out.
  • the filter insert is a cylindrical filter insert in which its external dimensions or geometry are designed in such a way that they allow unhindered insertion into the essentially cylindrical suction chamber and corresponding unhindered removal by a user of the washing machine.
  • the filter insert generally has components that are used to mechanically stabilize the Contribute filter insert itself and allow a fixed positioning in the cylindrical suction chamber. While the pump housing is almost cylindrical, apart from draft angles, the filter insert does not necessarily have to be cylindrical in its external geometry.
  • aqueous liquid is conveyed from the cylindrical suction chamber via the pump-out pressure chamber and the pump-out nozzle into a pump-out line, which is generally connected to a sewage system, so that the pumped-out aqueous liquid can be disposed of.
  • the molded-on shield on the filter cartridge has a connection area via which the shield is connected directly or indirectly to the first end of the essentially cylindrical filter cartridge.
  • the shield has the task of improving the seal between the pumping pressure chamber and the suction chamber and should also enable access to the pumping pressure chamber and thus also to the impeller of the pumping pump.
  • the shield is therefore generally adapted to the shape of the pump-over pressure chamber in order to enable good flow guidance.
  • the shield is therefore concave in shape in order to seal off a convex pumping pressure chamber from the cylindrical suction chamber.
  • the shield can thus be concave in shape to seal a convex pump over pressure chamber.
  • the shield for closing or sealing the pump-over pressure chamber is surrounded on the circumference by a labyrinth seal, in particular outside of a connection area.
  • the labyrinth seal is generally a non-contact seal in which the sealing effect is based on the lengthening of the flow path, i.e. usually through a flow deflection, through the gap to be sealed, which significantly increases the flow resistance. This can be realized, for example, by providing one or more stages along the flow path, in this case the aqueous liquid, so that the flow within the labyrinth seal (or stage seal) is deflected several times.
  • the labyrinth seal preferably has at least one stage, more preferably two or three stages.
  • the generally circumferential gap between the filter insert and the pump housing is expanded in such a way that this gap with the shield, which also acts as a collar or overlap can be referred to, is covered on the filter insert and, if necessary, an additional counterpart on the filter housing.
  • This generally radially pronounced shield above the axially running gap is preferably as parallel as possible to a radially building up pressure gradient in the pump-over pressure chamber.
  • the filter insert used according to the invention causes a massive flow deflection for the leakage flow, with which an increased pressure loss occurs, which enables the leakage flow to be reduced.
  • a washing machine is preferred in which the angle ⁇ between a pump-out motor shaft and a filter insert axis is in the range from >0° to 30°, for example in the range from 3° to 15°. It is particularly preferred that the angle ⁇ is selected in such a way that the static friction between the generally used plate spring of the filter insert, ie the sealing element for the pumping pressure chamber, and the pump housing is eliminated.
  • This embodiment of the present invention makes it possible for the sealing achieved according to the invention by the shield to be improved even further by an axial contact pressure on the pump-out seal, in particular if this is designed as a plate spring, because the "sliding off" of the filter insert on the partition to the pump-out pressure chamber a better closing of the pumping pressure chamber can be achieved by the shield on the filter insert, which closes the gaps caused by the principle better. A higher pressure loss can thus be generated, which constricts or restricts the leakage flow even more.
  • the filter insert can be clamped axially against the pump housing with regard to the pump-over or the pump-over motor such that the filter insert can slide radially in the direction of the pump-over pressure chamber with regard to the suction chamber.
  • This sliding of the filter insert on the boundary wall of the pump housing to the pumping pressure chamber can be achieved in particular if the angle ⁇ between a pumping motor shaft and a filter insert axis is in the range of 3° to 15°, with the angle ⁇ to be selected depending on the materials used, i.e whether, for example, plastics meet or a metal meets a plastic. If the self-locking (static friction) between the filter insert and the pump housing is eliminated, the filter insert in the suction chamber, i.e. in the pump housing, can press radially against the pumping pressure chamber in order to seal it as best as possible.
  • a washing machine according to the invention is also preferred in which the angle ⁇ between a circulation motor shaft and a filter insert axis is in the range from 70° to 110°, and preferably in the range from 85° to 95°.
  • the pump-out seal is preferably a plate spring, which generally acts axially in order to seal off an axially or quasi-axially arranged pressure chamber of the pump-out pump, ie the pump-out motor.
  • the invention enables the seal, which is generally arranged radially on the common suction chamber of the pump-over system and is conditionally accessible to the user, to be sealed Circulation pressure chamber uses a new, constructive sealing principle to minimize leakage flows, i.e. a hydraulic short circuit from the pressure chamber to the suction chamber, which requires double delivery of the leakage flow between the pump housing and the pump filter insert.
  • the filter insert can be designed as a fluff filter and/or as a foreign body trap.
  • the filter insert as a lint filter can be designed in the manner of a sieve, which serves in particular to hold back hair, lint and the like. Additionally or alternatively, the filter insert can be designed as a foreign body trap, which serves to hold back larger foreign bodies such as coins, hair clips or similar small parts.
  • the filter insert is designed as a foreign body trap.
  • the suction chamber is preceded by a fluff filter.
  • a washing machine is also preferred in which the filter insert has at least one guide bar parallel to a filter insert axis. This enables a stable, stationary positioning of the filter insert, which contributes to an optimal seal between the circulation pressure chamber and the suction chamber.
  • the pump-out motor and pump-over motor are generally electric motors.
  • the pump-out motor and the pump-around motor are each, for example, a brushless direct current motor (BLDC).
  • BLDC brushless direct current motor
  • These speed-variable and direction-of-rotation orientable drives allow the current pump status to be identified via the control-related acquisition of operating parameters such as speed and torque. That's how it is for example, detecting whether a pump used is pumping the entire flow or, for example, has sucked in air, the flow has been broken off and the pump has only built up a pressure column and is therefore in quasi-ventilated operation on the suction side. It can be determined when the pump-out motor is pumping out two-phase washing suds with reduced density at a constant, reduced power requirement.
  • the suction port has a larger diameter than the pump-out port and the pump-over port.
  • the size ratios or diameter ratios can also be designed differently.
  • a washing machine has a heating device.
  • the washing machine has a heating device for heating the aqueous liquid and a temperature sensor for measuring the temperature of the aqueous liquid in the tub.
  • the heating device is generally arranged in the lower part of the tub.
  • the heating device can be integrated in the water paths of the pumping system, for example in the pump or in the pressure-side pumping line or an air duct circuit or a steam unit of the washing machine. This has the advantage that there is no space for the heating device in the tub, which reduces the free liquor or dead liquor in the tub.
  • the amount of aqueous liquid required to treat the items of laundry can advantageously be reduced in order, among other things, to use less heating energy in order to reach comparable temperature levels.
  • the heating device and the temperature sensor can advantageously be controlled or evaluated by the control device, so that temperature regulation can be implemented.
  • the water supply device can be, for example, a time valve-controlled fresh water connection, the valve preferably being controllable by the control device.
  • the fresh water supply line to the tub then particularly preferably also has a flow sensor for determining the volume of fresh water introduced. With the additional detection of the filling level in the tub with the help of a pressure sensor, the water supply for the batch of laundry used can be precisely specified or adjusted.
  • the washing machine also has a load sensor for determining the mass of items of laundry in the drum.
  • the load sensor is advantageous here Tub arranged and connected to the control device.
  • the control device therefore preferably takes into account the load quantity and, if possible, also the type of load on the drum with items of laundry when controlling the pumping system.
  • the aqueous liquid is discharged into the domestic sewer.
  • control or regulating device is set up to take into account the loading with items of laundry.
  • the circulation motor of the circulation system is generally only switched on after the introduction of aqueous liquid, in particular water, has begun, in particular after a first predetermined volume V start of water has been introduced into the tub.
  • the aqueous liquid can be fresh water or process water, which can be stored in the washing machine in the form of gray water, for example, or a mixture of fresh water and gray water.
  • Gray water is waste water that is slightly polluted.
  • the liquid from the last rinse of a treatment program in the washing machine could not be pumped down the drain, but instead temporarily stored in an optional container in the washing machine.
  • the temporarily stored liquid could be flushed into the tub at the beginning of a pre-treatment phase. This has the advantage that fresh water is saved, which saves resources for treating the laundry items.
  • fresh water is supplied to the tub.
  • the aqueous liquid is preferably pumped off at the bottom of the tub and fed back to as central a point as possible in the drum or the tub, so that the items of laundry in the drum are impinged on in the middle or centrally with returned aqueous liquid.
  • a so-called laundry tunnel can be specially formed for this injection process, into which water is then injected centrally.
  • the point at which pumped treatment liquid is supplied to the tub is referred to herein as the tub inlet.
  • the treatment liquid can be fed back directly into the drum and onto the laundry items.
  • the tub inlet can be arranged in the area of a loading opening of the drum.
  • a rear feed is also conceivable, in which, for example, the aqueous medium is fed in through a hollow drive shaft.
  • the pumping system comprises, preferably in the control or regulating device, a pumping control unit and the pumping control unit detects a pumping motor power P and evaluates this with regard to density, degree of fluff and two-phase nature of the medium to be pumped, the presence of foreign bodies in the pump-over line and/or the contamination of a filter present in the pump-over line.
  • a connection between the pumping performance and various soiling states, e.g. of a filter used is preferably stored in the pumping control unit and/or the control device of the washing machine.
  • the invention has numerous advantages. It is thus possible to achieve very good hydraulic separation between the suction and pressure sides for the circulation pump of the pumping system without providing an additional, cost-intensive sealing element on the filter insert. In addition, good accessibility and visibility to the impeller of the circulation pump, which is usually arranged radially, can be realized on the pump housing. The filter insert can be easily removed by a user of the washing machine for cleaning purposes.
  • the manufacturing tolerances have a major impact on the functional design of the leakage current. Due to the development of the housing gap between the pump housing and filter insert that can be achieved according to the invention in an axial and radial form and through appropriate centering, the sealing effect can be virtually independent of the manufacturing tolerances of a one-dimensional gap development.
  • the manufacturing costs for the tools can be lower if less attention has to be paid to maintaining the radial gap geometries. This is particularly important when several tools or several tool cavities (tool cavities) are used in one tool to cover the parts requirement, for which separate tool costs are then incurred in order to keep the variance between the tools in terms of leakage current low.
  • longer tool maintenance cycles result according to the invention, in which the disruptive gap or leakage currents must be checked and limited again and again with a one-dimensional gap design, since the filter insert used according to the invention is less sensitive in this regard and therefore requires less maintenance.
  • the pumping system sealed according to the invention can be more reliable over the entire operating time (service life).
  • the double (axially and radially) acting seal is prestressed, not only can manufacturing tolerances be larger, but relaxation processes of plastics for the filter insert or the pump housing can also occur over the service life set by temperature change loads, can be counteracted.
  • a suction-side, radial ribbing of the shield of the filter insert, which closes the pumping pressure chamber and even extends beyond the sealing collar, can influence this effect even more positively and thus guarantee constantly low leakage currents over the entire operating time and the main functions of pumping and pumping over the service life of the Ensure washing machine.
  • FIG. 1 shows a perspective view of a pump housing 1 used according to the invention with pumping motor 5 and pumping motor 6 connected to it
  • the pump housing has a pump-out connection 2 , a pump-over connection 3 and an intake connection 4 .
  • a removable closure 7 is also arranged on the pump housing 1, to which a cylindrical filter insert (not visible here) is attached. 10 means a suction chamber.
  • FIG. 2 shows in Figure 2a a perspective view of a pump-out/pump-out motor 5.6 with an impeller 27 and Figure 2b a side view of the pump-out / pump-over motor 5.6 of Figure 2a , in which the shape of the impeller 27 can be seen more clearly.
  • FIG 3a shows a perspective view of a filter insert 8 used according to the invention, on which a removable closure, not shown here, is generally attached at the left end, via which a user of the washing machine can remove the filter insert 8 from a washing machine, also not shown here.
  • the filter insert 8 generally has a removable closure (not shown here) at a first end 15, a disk spring 17 as an evacuation seal at a second end 16 for sealing an evacuation pressure chamber (not shown here) against a cylindrical suction chamber (also not shown here), and on its circumference a here circular pumping-over opening 9 to the pumping-over pressure chamber (not shown), the periphery having a shield 18 enclosing the pumping-over opening 9, which seals the pumping-over pressure chamber from the suction chamber.
  • the shield 18 has a connection area 19 via which the shield 18 is connected directly or indirectly to the first end 15 of the cylindrical filter insert 8 . Since the shield 18 is here a part of the cylindrical filter cartridge formed by injection molding of a plastic material, the connection area 19 is here an integral plastic part. Shield 18, in this non-limiting embodiment, is concave in shape to seal a convex-shaped pump-over pressure chamber from a cylindrical suction chamber. In addition, the shield 18 is surrounded outside of the connection area 19 by a labyrinth seal 20 not shown in detail here.
  • Figure 3b shows another perspective view of the in Figure 3a shown filter cartridge, in which the filter cartridge 8 parallel to a filter cartridge axis 25 has a guide bar 28 for better positioning.
  • FIG 4a shows a side view of a filter insert 8 which is provided with a removable closure 7 which is only indicated here and which is not used according to the invention, namely in which a shield 18 without a labyrinth seal is used.
  • 17 denotes a disk spring, 9 a circular opening in the shield 18, and 19 a connecting portion, via which the shield 18 is connected to the second end 16 of the cylindrical filter insert 8 .
  • 28 means a guide bar and 15 the second end of the cylindrical filter insert 8.
  • Figure 4b shows compared to Figure 4a a side view of a substantially cylindrical filter cartridge provided with an openable screw cap in an embodiment used according to the invention, in which a shield with a labyrinth seal 20 is used.
  • figure 5 shows a vertical longitudinal section through a closure 7, a filter insert 8, the common suction chamber 10 and the pressure chamber 11 of the pump.
  • 28 means a guide web, 12 the pumping pressure chamber and 25 a filter insert axis.
  • 27 means an impeller of the pump-out motor 5.
  • 2 means the pump-out connection and 24 the pump-out motor shaft.
  • FIG. 6 shows a side view of a pump-over system with a pump-over motor dismantled in order to show the gap geometry between the pump housing 1 and the filter insert 8 .
  • 7 means a removable closure, 10 a suction chamber, 4 a pump-over connection, 2 the pump-out connection, 5 a pump-out motor, 25 a filter cartridge axle, 18 the shield in which a circular opening 9 to the pump-over pressure chamber 12 is arranged.
  • 20 means a labyrinth seal around the shield 18.
  • FIG. 7 shows a sectional view through a pump-over system in which the pump-down pressure chamber 11 has a relatively small angle ⁇ to the suction chamber 10 in order to achieve an even better seal between the suction chamber 10 and the pump-over pressure chamber 12 .
  • 17 means a disc spring, 18 a shield with an opening to the pumping pressure chamber 12, which cannot be seen here.
  • 29 means a resulting contact pressure and 30 an axial tension by a (screwable) closure cap 7.
  • 8 means a filter insert.
  • the embodiment shown allows the filter insert 8 to slide off in the radial direction in relation to the common suction chamber 10, for better sealing of the pump-over pressure chamber 12.
  • the disc spring 17 acts as a sealing element for the pump-out pressure chamber.
  • This embodiment allows the filter insert 8 to be removed from the pump-over pressure chamber 12 after axial relaxation by unscrewing the filter cover 7 . This has the effect that although there is another resistance force when inserting the filter element 8 into the suction chamber 10, the filter insert 8 against the sealing surface to the pumping pressure chamber 12, but when removing the filter insert 8 there is enough freedom of movement to prevent the filter insert 8 from jamming in the pump housing 1 when the filter insert 8 is removed if a user of the washing machine is forced to use the pumping system to be cleaned for maintenance purposes.
  • FIG. 8 12 shows a labyrinth seal 20 in detail, this having a two-stage labyrinth seal 13 with two stages 21, 22 on the left and a three-stage labyrinth seal 14 with three stages 21, 22, 23 on the right for illustration purposes.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
EP22154986.8A 2021-03-03 2022-02-03 Lave-linge pourvu de système de pompe de transvasement et son procédé de fonctionnement Pending EP4053323A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021202010.0A DE102021202010A1 (de) 2021-03-03 2021-03-03 Waschmaschine mit Umpumpsystem und Verfahren zu deren Betrieb

Publications (1)

Publication Number Publication Date
EP4053323A1 true EP4053323A1 (fr) 2022-09-07

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ID=80225770

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22154986.8A Pending EP4053323A1 (fr) 2021-03-03 2022-02-03 Lave-linge pourvu de système de pompe de transvasement et son procédé de fonctionnement

Country Status (3)

Country Link
EP (1) EP4053323A1 (fr)
CN (1) CN115012174A (fr)
DE (1) DE102021202010A1 (fr)

Citations (6)

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DE102016212478A1 (de) 2016-07-08 2018-01-11 BSH Hausgeräte GmbH Wäschepflegegerät mit einem Filter
CN108729148A (zh) * 2017-04-19 2018-11-02 青岛海尔洗衣机有限公司 一种洗衣机泵及洗衣机
EP3508647A1 (fr) * 2018-01-05 2019-07-10 LG Electronics Inc. Machine à laver et son procédé de commande
DE102018206364A1 (de) 2018-04-25 2019-11-21 BSH Hausgeräte GmbH Haushaltsgerät zur Pflege von Wäschestücken und Verfahren zum Betreiben eines Haushaltsgeräts
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