EP2631345A1 - Unité de bac de lavage et machine à laver - Google Patents

Unité de bac de lavage et machine à laver Download PDF

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Publication number
EP2631345A1
EP2631345A1 EP12157033.7A EP12157033A EP2631345A1 EP 2631345 A1 EP2631345 A1 EP 2631345A1 EP 12157033 A EP12157033 A EP 12157033A EP 2631345 A1 EP2631345 A1 EP 2631345A1
Authority
EP
European Patent Office
Prior art keywords
tub
conduit
sump
draining
pump
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.)
Granted
Application number
EP12157033.7A
Other languages
German (de)
English (en)
Other versions
EP2631345B1 (fr
Inventor
Mauro Cinello
Vittorio Perosa
Francesco Sacilotto
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.)
Electrolux Home Products Corp NV
Original Assignee
Electrolux Home Products Corp NV
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 Electrolux Home Products Corp NV filed Critical Electrolux Home Products Corp NV
Priority to EP12157033.7A priority Critical patent/EP2631345B1/fr
Priority to PCT/EP2013/053711 priority patent/WO2013127739A2/fr
Priority to CN201380011282.9A priority patent/CN104136678B/zh
Publication of EP2631345A1 publication Critical patent/EP2631345A1/fr
Application granted granted Critical
Publication of EP2631345B1 publication Critical patent/EP2631345B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/083—Liquid discharge or recirculation arrangements
    • D06F39/085—Arrangements or adaptations of pumps

Definitions

  • the invention relates to a washing tub unit for a washing machine and a washing machine.
  • Washing machines in households also called domestic washing machines, are well-known and usually are used for washing laundry.
  • Washing machines usually comprise washing tubs in which a rotatable drum is housed for receiving goods to be washed, usually laundry. Washing liquid is introduced into the washing tub, which washing liquid consists only of water or mainly of water and detergents or washing or cleaning agents added to or dissolved in the water for improving the washing quality.
  • a sump is arranged for draining the washing liquid from the tub into a draining circuit or draining device in order to either feed back the washing liquid from the sump into the washing tub again, often being heated by a heating element arranged in or near the sump, in a closed circuit or circulation mode or to drain the washing liquid out of the washing machine into a sewage conduit, in an open circuit, when it is not needed any more.
  • EP 2 198 081 B1 discloses a plastic washing-machine tub with a front wall, a rear wall and a cylindrical wall enclosing an inner tub compartment.
  • the tub comprises two tub shells made from injection-moulded plastic that can be connected together by means of an assembly plane in a tub closure direction, the first tub shell comprising the front wall and the second tub shell comprising the rear wall, and further an integral bulge emerging from the cylindrical wall and defining a cavity serving as draining sump connected to the inner tub compartment via an inlet opening for emptying washing water form the inner tub compartment and a subsequent draining pipe or conduit with an outlet opening.
  • the assembly plane divides the bulge into two parts, a first bulge part being arranged in the first tub shell and a second bulge part in the second tub shell, one of the bulge parts having at least one part of the inlet and outlet opening. Furthermore, the conduit of the bulge is in the tub closure direction divided by the assembly plane.
  • the two tub shells are connected using a welding technique, in particular hot plate welding.
  • the bulge is centered in the cylindrical wall projecting therefrom at a bulge distance from the front wall and/or from the rear wall.
  • the closure/joining direction of the shells of the tub is the same as the demoulding direction of each of the shells in the injection-moulding from and is perpendicular to the assembly plane.
  • the bulge is also sealed by means of the parting line of those shells.
  • the bulge extends from lower tub part to the upper tub part while the assembly plane defining a part of the cavity as a pressure chamber which is connected to the inner tub compartment by a lower chamber part and isolated from the inner tub compartment by an upper chamber part and which has a ventilation hole arranged in its upper part.
  • EP 0 110 482 A1 discloses a washing machine having a washing tub with a draining sump integral with a first shell-like tub part of the washing tub and a basically flat or planar second tub part for closing the sump from one side thereof.
  • the second tub part and the first tub part are connected with each other at a seam.
  • the sump is fluidly connected to a parallel compartment through a rectangular slit in one of its side walls.
  • a draining conduit is arranged for draining liquid from the compartment, which conduit is made integral with the first tub part at three sides and closed at the front by the second tub part.
  • the draining pump will be connected to this conduit but is not described. Because of the shape of the rectangular opening bigger obstacles cannot pass through and the water escaping from the sump through the opening into the parallel compartment will be filtered from such larger obstacles and be drained downwards into the draining conduit.
  • a washing tub for a washing machine which is also made of two tub parts connected with each other.
  • a draining sump is completely formed within one of the tub part and connected to a pump wheel chamber within a pump wheel housing through an opening in the lower region of the sump.
  • the pump wheel housing enclosing the pump wheel chamber is made integral with the tub part at three sides and closed by a planar wall of the other tub part sealed by a sealing ring.
  • the drive of the pump is arranged in front of the planar wall and the axle for driving the pump wheel reaches through the tub part into the pump wheel chamber.
  • EP 0 026 018 A1 discloses a further washing machine with a washing tub and a sump wherein a drive system for rotating the rotating drum within the washing tub comprises a belt and a toothed driving wheel driving the belt and being arranged on an axle driven by an electric motor.
  • the belts and the driving wheel and the axle are all arranged within the sump resulting in disturbances in the flow of the washing liquid through the sump.
  • a washing tub unit for a washing machine comprising
  • the pump can be mounted in a simple way onto the pump receiving part at the first end of the conduit which is separated from the second end where the connection between cover wall and the conduit is made. Therefore, the pump receiving part of the conduit bears the forces from the pump (by gravity and rotation) at the first end of the conduit which forces are transferred into and born by the tub part the conduit is made integral with. So, the connection, in particular a connecting seam, between the cover wall and the conduit at the second end of the conduit which is at the other side of the conduit is not loaded or strained by the pump forces so that the sealing between the cover wall and the conduit at the connecting area at the second end is not endangered.
  • draining instead of the word “draining” also the word “drainage” can be used in this application and vice versa.
  • “Circumferential wall” means a wall that is arranged, in particular in a closed manner, around something like an axis for instance and is not limited to a cylindrical or circular shape.
  • the pre-formed tub parts are preferably each injection-moulded or formed by injection-moulding from a thermoplastic material.
  • the cover wall, in order to be integral with the corresponding tub part is then preferably formed from the same thermoplastic material as the corresponding tub part and/or formed in the same injection-moulding process as the corresponding tub part.
  • Preferably the connection between the two tub parts is made by hot welding.
  • the draining pump has at least one pump wheel arranged within a pump wheel housing and a pump drive for driving the pump wheel in a rotational movement about a central axis as rotational axis, wherein the pump wheel housing with the pump wheel of the draining pump is arranged within the interior of the pump receiving part of the conduit surrounded by a circumferential wall and the pump drive is mounted onto an end side of the pump receiving part and/or wherein the conduit or its inner chamber extends along the central axis which is the rotational axis of the pump wheel and is preferably horizontal.
  • the draining conduit has preferably a circumferential wall structure, surrounding an inner chamber of the conduit and the cover wall is connected to the circumferential wall structure of the conduit at the second end in the connecting area and/or in the connecting plane, which connection is preferably made at the same time the two tub parts are connected.
  • a separating part of the circumferential wall structure of the conduit forms a part of the side wall structure of the sump and separates the sump from the inner chamber of the conduit, wherein the inner chamber of the conduit is in fluid connection with the sump through at least one sump outlet, which sump outlet is formed as an opening in the separating part of the circumferential wall structure.
  • a filter element having a filtering section for filtering objects of specific size and/or dimensions out of the drained liquid, the filter element being arranged within or in the inner chamber of the conduit.
  • the filter element is insertable into or removable from the conduit through an opening at the first end of the conduit, wherein the draining pump is releasably mounted to the pump receiving part at the first end of the conduit, and the filter element is insertable or removable after demounting of the draining pump.
  • a flange of the pump closes this opening and the conduit at the first end, the flange in particular separating the pump wheel and the pump drive which is arranged outside the conduit.
  • a sealing gasket is arranged between the flange and the conduit.
  • the sump is formed integral with the same tub part the conduit is formed integral with and is closed by a cover wall, which cover wall is formed integral with the same tub part which the cover wall for the conduit is formed integral with.
  • the cavities or volumes of the conduit as well as of the sump are formed entirely in this, in particular rear, tub part and only closed by the front tub part. This allows for simple moulding forms and manufacture.
  • the sump has a side wall structure and a sump bottom and the cover wall for the sump forms a side wall part, in particular a front side wall part, which is connected with the side wall structure and the sump bottom of the sump in the connecting area.
  • cover wall for the sump in particular the side wall part, preferably front side wall part, has, at least at a surface facing the sump, a flat or planar surface and/or lies itself or has its flat or planar surface lying in a connecting plane or in a same plane as the connecting area of the two tub parts.
  • an opening is formed for connecting a level detection tube of a level detection device.
  • a central axis of the, preferably circular, opening and/or an inserting direction for inserting a connecting end of the level detection tube is oriented parallel to the central axis of the conduit.
  • the inner dimensions or diameters of each cavity and concave space as seen in a linear projection along a retraction axis, in particular along or parallel to the central axis, in the rear tub part, the sump, the rear tub interior and the draining conduit, do not increase, in a direction opposite to a retraction direction of each moulding form used for forming said rear tub part.
  • a washing machine having a washing tub unit according to the invention.
  • FIG 1 to 10 Identical or at least corresponding parts and quantities in FIG 1 to 10 are designated with the same reference numerals.
  • FIG 1 and FIG 2 show a washing tub unit for a washing machine comprising a washing tub 2 and a draining device 7.
  • the washing tub 2 is basically assembled from two parts, in this case a front tub part 21 and a rear tub part 22, which are connected in a connecting area 20 in order to form the washing tub 2 that it is closed in a liquid-tight manner, at its rear and at its circumference.
  • At least one front connecting part 23 of the front tub part 21 and at least one rear connecting part 24 of the rear tub part 22 are connected with each other, in particular by hot welding in order to form a sort of liquid-tight welding seam in the connecting area 20.
  • the front connecting part 23 and the rear connecting part 24 are in particular formed at least partially like connecting flanges which are pressed against each other and then connected, in particular welded by hot welding, to form a permanent connection between the two connecting parts 23 and 24 and thus between the two tub parts 21 and 22.
  • the connecting area 20 is preferably arranged in or forms a connecting or joining plane.
  • the connecting parts 23 and 24 have planar surfaces that are joined, in particular welded, in the connecting plane.
  • the front tub part 21 and the rear tub part 22 are, therefore, at least in their connecting parts 23 and 24, formed or made of a material that can be hot welded, preferably a suitable thermoplast or thermoplastic material, as are well known in the art
  • the complete rear front tub part 21 and the complete rear tub part 22 are formed from such a thermoplast or thermoplastic material and are produced by moulding between or in at least two complementary moulding forms, in particular injection-moulding in the moulding forms.
  • the hot welded connection also ensures a water tight connection so that no water or washing liquid can escape from the washing tub 2 through or in the connecting area 20 and no further seals or sealing rings are required.
  • the opening 4 is at least partially surrounded by a counterweight structure 5 associated to the front tub part 21 for balancing the washing tub unit during operative conditions.
  • the opening 4 allows access from the exterior or outside of the washing tub 2 to a carrier, in this case a rotatable or rotating drum 3, arranged in the tub interior 9 of the washing tub 2.
  • a carrier in this case a rotatable or rotating drum 3, arranged in the tub interior 9 of the washing tub 2.
  • the washing tub 2 is preferably mainly formed in a cylindrical shape.
  • the drum 3 is rotatable or can be rotated by a rotation drive or drum drive 6 a part of which is shown in FIG 1 below the washing tub 2 but is not explained any further as the rotation and the drive of the rotating drum are well-known in the art.
  • the drum drive 6 is fastened at fastening section 61 arranged at the lower section of the rear tub part 21.
  • the rear tub part 21 has a central through-hole 60 for a drive axle (not shown) connecting the drum drive 6 with the drum 3 for rotation of the drum 3 and bearing the forces and momenta exerted by the rotating drum 3 and the load of the laundry or the washing goods within the drum 3.
  • the rear side of the rear tub part 22 is reinforced with reinforcing ribs 62 around the through-hole 60.
  • a sump 10 is formed, which has an advantageous construction according to the invention.
  • the sump 10 has a mainly horizontal sump bottom 13 and a side wall structure 11 rising upwards from the sump bottom 13 up to the tub bottom 12, so that the sump bottom 13 is the lowest wall of the sump 10 and arranged below the tub bottom 12.
  • An opening in the tub bottom 12 surrounded by the side wall structure 11 forms a sump inlet 18 for the washing liquid in the uppermost part of the sump 10.
  • the sump bottom 13 and the side wall structure 11 are arranged lower than the tub bottom 12 so that washing liquid in the washing tub 2 can be collected and drained in the sump 10 under the influence of gravity and/or, in addition, low pressure exerted by a draining pump 70 of the draining device 7.
  • a carrier bridge 14 extends within the sump inlet 18 over the sump 10 as a protrusion or extension of the tub bottom 12 inwards from a side wall part 11B and serves as a resting surface or element for coupling a holding element for a heating element (not shown) for heating the washing liquid within the tub 2 which heating element is connected electrically outside the tub 2 through a through-hole 63 in the back of the rear tub part 22.
  • a rear tub bottom part 12A and adjacent side wall parts 11A, 11B, 11C and 11D of the side wall structure 11 of the sump 10 and the sump bottom 13, that is to say all limiting walls of the sump 10 except for a front sump wall 11E, are integral with or part of the rear tub part 22, preferably formed from the same thermoplastic material and in the same injection-moulding process in the same moulding form.
  • the side wall parts 11A, 11B and 11C follow each other around the sump 10, preferably arranged rectangularly to each other, and are at least approximately vertical walls with sloped upper entry sections at the sump inlet 18 and preferably horizontally curved intermediate transition sections in between the side wall parts 11A, 11B and 11C.
  • the side wall part 11D is arranged above the vertical side wall part 11C and slopes upwardly from the vertical side wall part 11C forming a bottom wall of an air channel 16 of the sump 10 for releasing air bubbles caught in the liquid in the sump 10.
  • a sump front wall 11E which closes the side wall structure 11 of the sump 10 at the front is formed integral with the front tub part 21 and connected with the adjacent side wall parts 11A and 11C and 11D and with the sump bottom 13 at the connecting parts 23 and 24 in the connecting area 20 to close and also seal the sump 10.
  • the front wall 11E lies in the connecting plane of the two tub parts 21 and 22 and is surrounded by the connecting parts 23 and 24 which are connected, in particular welded, together in the connecting area 20.
  • a front tub bottom part 12B of the tub bottom 12 is integral with the front tub part 21 and partly connected by the hot welding in a sealed manner with the rear tub bottom part 12A in or at the connecting area 20 and partly separated from the rear tub bottom part 12A by the sump 10 and by the air channel 16 of the sump 10.
  • the draining device 7 is shown in greater detail in FIG 5 to 10 . Adjacent to the sump 10 and arranged at least partly lower than the sump 10 and its sump bottom 13 there is a draining conduit 75 of the draining device 7.
  • the draining conduit 75 has, next to the sump 10, a mainly cylindrical circumferential wall 17 in which a rectangular opening is formed as a sump outlet 15 through which the sump 10 is in fluid connection with the draining conduit 75.
  • the sump outlet 15 is arranged above the sump bottom 13, the sump bottom 13 slightly sloping downward towards the section of the circumferential wall 17 which is below the sump outlet 15, and/or arranged in an upper region of the circumferential wall 17 to allow for smooth draining flow from the sump 10 into the draining conduit 75.
  • the draining conduit 75 also comprises, at a first end, here a rear end 75A, a pump receiving part 37 which has a mainly cylindrical circumferential wall 87 in which a draining outlet 74 is formed.
  • a central (geometrical) axis A of the draining conduit 75 runs through the central region of the circumferential wall 17 and the pump receiving part 37 being their respective central or cylinder axis.
  • the pump receiving part 37 or its circumferential wall 87 is arranged coaxially and subsequent to the circumferential wall 17 with respect to the central axis A at an opposite end of the circumferential wall 17 than the front tub part 21.
  • the circumferential wall 87 of the pump receiving part 37 has a greater diameter or radius from the axis A than the circumferential wall 17.
  • the circumferential walls 17 and 87 of the draining conduit 75 together enclose an inner space or inner chamber 85 of the draining conduit 75.
  • the circumferential wall structure of the conduit 75 protrudes or extends into the sump 10 and connects the sump bottom 13 with the side wall parts 11B and 11C of the side wall structure 11 of the sump 10, thus forming a rigid structure, as can be seen best in FIG 3 and 4 . Therefore, the circumferential walls 17 and 87 of the draining conduit 75 form themselves curved side wall parts of the side wall structure 11 of the sump 10 and, at the same time, separation wall(s) between the sump 10 and the conduit inner chamber 85.
  • the curved circumferential wall 17 and 87 of the conduit 75 within the sump 10, i.e the parts defining side wall parts of the side wall structure 11 or separation walls between the sump 10 and the conduit 75, describe or cover an angle range ⁇ of usually at least 90°, preferably between 100° and 120°, measured around the central axis A.
  • the corresponding opening angle ⁇ of the sump outlet 15, i.e. the opening in the circumferential wall 17 through which the sump 10 is in fluid communication with the inner chamber 85 of the conduit 75, is smaller than the angle range ⁇ and typically 80° or less.
  • the conduit 75 is, thus, rigidly connected with the sump side wall structure 11 and the tub bottom 12 over a pre-determined length and with at least two sump side wall parts 11B and 11C and the sump bottom 13 so that forces exerted on the conduit 75 are distributed and born in a larger section into three dimensions
  • the draining device 7 comprises a draining pump 70 with a pump wheel 72 (only shown in FIG 8 and FIG 10 ) as well as a pump drive 71, usually an electric motor with or without a gear and preferably with, usually electronic, control of the rotational speed, for rotating the pump wheel 72 about a rotational axis which is the central axis A of the draining conduit 75 in the mounted state.
  • a rear side 87 of the pump receiving part 37 at the rear end 75A of the conduit 75 pointing away from the circumferential wall 17 is formed like a ring-shaped flange or flange ring surrounding a rear opening 88 of the pump receiving part 37.
  • the pump drive 71 is fixed at this rear side 87 of the pump receiving part 37 of the draining conduit 75 at the rear end 75A, preferably by means of a circular planar drive flange 82 and screws 83 to be guided through guidings 84 in the drive flange 82 and to be screwed into corresponding screw holes 88 at the rear side 87.
  • the pump receiving part 37 and thus the whole conduit 75 has to bear the weight of the pump 70 which is accomplished by the rigid tube-like construction and the rigid connection with the sump 10 as already described.
  • a gasket or sealing ring (not shown) is arranged between the pump receiving part 37 of the draining conduit 75 and the drive flange 82 for sealing.
  • the pump wheel 72 together with a mainly cylindrical pump wheel housing 73 is introduced through the rear opening 88 into the inner conduit chamber 85 and arranged within the pump receiving part 37 or, more specifically, inside the part of the inner conduit chamber 85 of the draining conduit 75 that is surrounded by the circumferential wall 87 of the pump receiving part 37.
  • the whole circumferential wall structure 17 and 87 and the pump receiving part 37 of the conduit 75 are formed integral with the rear tub part 12, i.e. formed in the same material and/or injection-moulding process.
  • the front tub part 21 has a cover wall 25.
  • the cover wall 25 covers or closes the draining conduit 75 and its inner chamber 85 at a second end, here a front end, 75B which is, as seen axially along the central axis A, opposite to the rear end 75A and, further upwardly, forms the sump front wall 11E of the sump 10 and continues into a front tub bottom part 12B of the tub bottom 12 which is more or less directed at a right angle to the cover wall 25.
  • the front cover of the conduit 75 and the sump 10 are formed integrally by the same cover wall 25 which in turn is formed integrally with the front tub part 21.
  • the cover wall 25 is at least at the side towards the conduit 75 or sump 10 mainly flat or planar and is at least at the front end 75B of the conduit 75 oriented orthogonal to the central axis A of the conduit 75. Furthermore, the cover wall 25 is connected with the circumferential wall 17 of the conduit 75, usually in the connecting area 20 and/or in the connecting plane, which connection is made at the same time the two tub parts 21 and 22 are connected by hot welding.
  • the cavity or volume or the conduit 75 as well as of the sump 10 is in each case formed entirely in the rear tub part 22 and only closed by the front tub part 21. This allows for simple moulding forms and manufacture.
  • the sump front wall 11E which is preferably constituted or formed by the cover wall 25, there is a hole or an opening 80 for mounting a pipe or level detection tube 28 of a level detection device 8.
  • the level detection tube 28 is arranged at least slightly upwardly and is closed at a distal end or upper end 28A opposite to the connecting end 28B which is connected in the opening 80.
  • a different level of washing liquid in the sump 10 and the tub bottom 12 will result in a different filling level in the level detection tube 28 and cause a variation of the air pressure above the liquid level which can be detected or sensed by an air pressure sensor 81 at the upper end 28A.
  • This opening 80 is arranged above the draining conduit 75 and on the other side of the sump 10 than the sump outlet 15, basically opposite to the sump outlet 15, which results in the level detection tube 28 being emptied efficiently by the pump pressure being exerted in the sump 10 through the sump outlet 15.
  • a central axis of the, preferably circular, opening 80 and/or an inserting direction for inserting the connecting end 28B of the level detection tube 28 is oriented parallel to the central axis A of the conduit 75.
  • a filter element 76 is arranged, having a filtering section 77 for filtering out objects of specific size and/or dimensions, in particular larger and/or longer objects, from the draining liquid to prevent them from reaching the pump wheel 72.
  • the filtering section 77 is arranged essentially within the circumferential wall 17 of the conduit 75 when the filter element 76 is mounted.
  • the filter element 76 has further a, preferably mainly cylindrical, pump wheel housing 73 formed integral with the filter element 76 or the filtering section 77 and being arranged within the pump receiving part 37 of the conduit 75 in the mounted state.
  • the central axis A of the conduit 75 extends, in the mounted state, preferably in a horizontal direction or in a horizontal plane orthogonal to the direction of gravity which results in a horizontal axial flow of draining liquid through the draining conduit 75 and improves the filtering effect of the filter 76
  • the main draining flow direction of the liquid in the direction from the sump outlet 15 to the rear end 75A to the pump wheel 72 is, thus, horizontal and orientated from the front to the rear or away from the front tub part 21 and its front cover 25. Also there is an axial inflow along the horizontal axis A towards the pump wheel 72 which in turn has a radial outflow like a centrifugal pump.
  • the draining outlet 74 of the pump receiving part 37 of the draining conduit 75 consists of a short pipe or tube extending fro the circumferential wall 87 outwardly, essentially in radial direction from the axis A, and is inclined upwardly with respect to the axis A or a horizontal plane.
  • a filter element 76 is mounted into the inner chamber 85 of the draining conduit 75 by inserting the filter element 76 through the rear opening 88 in an axial direction along the central axis A.
  • a correct angular position of the filter element 76 within the conduit 75 is ensured by a positioning element 91 at the filter element 76 which is to be inserted into a positioning slot 92 at the circumferential wall 17 of the conduit 75 which positioning means 91 and 92 also support an angular fixation between filter element 76 and conduit 75.
  • the pump wheel housing 73 has a sort of bowl or pot shape and is provided with a mainly cylindrical housing circumferential wall 93 surrounding the central axis A when mounted and with a circular ring-shaped housing front wall 94 being perpendicular to the central axis A and separating as a separation wall the interior of the housing circumferential wall 93 from the filtering section 77.
  • the housing circumferential wall 93 is provided with an opening over a certain angle about the axis A as a housing outlet 78.
  • the separation wall or housing front wall 94 has a central opening through which the central axis A runs in the mounted state and which serves as a filter outlet 79 or a housing inlet and brings the filtering section 77 and the pump wheel housing 73 in fluid connection.
  • the pump wheel housing 73 When the filter element 76 is mounted the pump wheel housing 73 is received in the pump receiving part 37 of the conduit 75 and its housing outlet 78 overlaps in the angular range and is, thus, in fluid connection with the draining outlet 74 at the circumferential wall 87, which angular positioning is assisted and ensured by the positioning element 91 being inserted into the positioning slot 92.
  • the pump wheel housing 73 has a slightly smaller diameter than the circumferential wall 87 of the conduit 75.
  • the pump wheel 72 of the pump 70 can be introduced into the pump wheel housing 73 of the filter element 76.
  • the central axis A is the central axis of the pump wheel housing 73 and the pump wheel 72 as its rotational axis and preferably axis of inertia for balanced rotation.
  • the blades or wings of the pump wheel 72 When the pump wheel 72 is introduced into the pump wheel housing 73, the blades or wings of the pump wheel 72 have a radial distance to the inner wall of the pump wheel housing 73 and can be rotated about the axis A within the pump wheel housing 73 in order to suck or draw in washing liquid from the sump 10 through the sump outlet 15 into the inner conduit chamber 85 and through the filtering section 77 and thereafter through the filer outlet 79 into the pump wheel housing 73 and to dispense or pump the liquid out of the pump wheel housing 73 through the housing outlet 78 and the draining outlet 74 in a mainly radial direction. So, the draining pump 70 and its pump wheel 72 have an axial inflow and a radial outflow for the washing liquid with respect to the central axis A.
  • the pump wheel 72 is separated from the sump 10 by means of the draining conduit 75 and the filter element 76 and the flow path and thus flow resistance are reduced, thereby reducing energy losses.
  • the pump wheel 72 generates a low pressure in the conduit 75 and thus in the sump 10 and a steady flow of the drained liquid through the horizontal conduit 75.
  • connecting elements 26 and 27 can be provided wherein, as shown, the connecting element 26 arranged at the front tub part 21 is a protruding part and is received by a receiving recess as a second connecting element 27 which design improves the connecting properties of hot welding and constitutes a welded water tight sealing. Also the connecting parts 26 and 27 allow for a pre-positioning of the two tub parts 21 and 22 before welding.
  • the front tub part 21 and the rear tub part 22 are, in the preferred embodiment shown, both formed in such a way that they can be injection-moulded from a thermoplastic material between two moulding forms in a moulding process reducing the use of runners or moveable form parts in further moulding steps.
  • At least one, preferably both, of the two moulding forms usually an inner moulding form, forms cavities and concave spaces in the tub parts 21 and 22 such as the sump 10 or the tub interior 9 or the draining conduit 75 which cavities or concave spaces start at the connecting line between the two moulding parts and are open towards the connecting part line of the moulding parts, wherein the sump 10 and the conduit 75 are preferably basically formed in the rear tub part 22.
  • the front tub part 21 and preferably also the most part of the rear tub part 22, have a shape that allows for direct linear retraction of the moulding forms along a common retraction direction which is parallel to an axis running through the tub part 21 or 22 in case of tub part 22 the central axis A of the draining conduit 75.
  • a common retraction direction which is parallel to an axis running through the tub part 21 or 22 in case of tub part 22 the central axis A of the draining conduit 75.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
EP12157033.7A 2012-02-27 2012-02-27 Unité de bac de lavage et machine à laver Active EP2631345B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP12157033.7A EP2631345B1 (fr) 2012-02-27 2012-02-27 Unité de bac de lavage et machine à laver
PCT/EP2013/053711 WO2013127739A2 (fr) 2012-02-27 2013-02-25 Unité cuve de lavage et machine à laver
CN201380011282.9A CN104136678B (zh) 2012-02-27 2013-02-25 洗涤桶单元以及洗衣机

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12157033.7A EP2631345B1 (fr) 2012-02-27 2012-02-27 Unité de bac de lavage et machine à laver

Publications (2)

Publication Number Publication Date
EP2631345A1 true EP2631345A1 (fr) 2013-08-28
EP2631345B1 EP2631345B1 (fr) 2019-09-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP12157033.7A Active EP2631345B1 (fr) 2012-02-27 2012-02-27 Unité de bac de lavage et machine à laver

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EP (1) EP2631345B1 (fr)
CN (1) CN104136678B (fr)
WO (1) WO2013127739A2 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105113191A (zh) * 2015-04-30 2015-12-02 湖北文理学院 设置水位探测管螺旋接头的全自动洗衣机集水筒
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EP0110482A1 (fr) 1982-12-06 1984-06-13 Constructions Electro-Mecaniques D'amiens Machine à laver le linge à canalisation de vidange s'ouvrant en fond de cuve
EP0267837A1 (fr) 1986-10-28 1988-05-18 Ciapem Lave-linge à pompes de recyclage et de vidange
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EP2198081B1 (fr) 2007-09-07 2011-02-23 BSH Bosch und Siemens Hausgeräte GmbH Cuve de machine à laver en plastique
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EP2405050A1 (fr) * 2010-07-08 2012-01-11 Electrolux Home Products Corporation N.V. Machine à laver

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CN104136678B (zh) 2017-12-26
CN104136678A (zh) 2014-11-05
WO2013127739A2 (fr) 2013-09-06
WO2013127739A3 (fr) 2014-08-28
EP2631345B1 (fr) 2019-09-04

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