EP2631344B1 - Cuve de lavage et machine à laver - Google Patents

Cuve de lavage et machine à laver Download PDF

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Publication number
EP2631344B1
EP2631344B1 EP12157041.0A EP12157041A EP2631344B1 EP 2631344 B1 EP2631344 B1 EP 2631344B1 EP 12157041 A EP12157041 A EP 12157041A EP 2631344 B1 EP2631344 B1 EP 2631344B1
Authority
EP
European Patent Office
Prior art keywords
sump
tub
washing
air channel
inlet
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.)
Not-in-force
Application number
EP12157041.0A
Other languages
German (de)
English (en)
Other versions
EP2631344A1 (fr
Inventor
Martino Bondi
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 EP12157041.0A priority Critical patent/EP2631344B1/fr
Publication of EP2631344A1 publication Critical patent/EP2631344A1/fr
Application granted granted Critical
Publication of EP2631344B1 publication Critical patent/EP2631344B1/fr
Not-in-force 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
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/26—Casings; Tubs
    • D06F37/261—Tubs made by a specially selected manufacturing process or characterised by their assembly from elements
    • D06F37/262—Tubs made by a specially selected manufacturing process or characterised by their assembly from elements made of plastic material, e.g. by injection moulding
    • 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
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/26—Casings; Tubs
    • D06F37/261—Tubs made by a specially selected manufacturing process or characterised by their assembly from elements
    • D06F37/263—Tubs made by a specially selected manufacturing process or characterised by their assembly from elements assembled from at least two elements connected to each other; Connecting or sealing means therefor
    • 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
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/26—Casings; Tubs
    • D06F37/264—Tubs provided with reinforcing structures, e.g. ribs, inserts, braces
    • 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
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/26—Casings; Tubs
    • D06F37/267—Tubs specially adapted for mounting thereto components or devices not provided for in preceding subgroups
    • 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

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.
  • US 6574996 discloses a washing machine including a tub with a sump and a dam placed therein for preventing debris heavier than water from flowing to the sump outlet.
  • air bubbles can form due to turbulences which air bubbles hinder the flow of washing liquid and thus slow down the draining process.
  • the first end of the air channel is arranged lower than the second end of the air channel and than the sump inlet and the second end is horizontally displaced to the sump inlet.
  • the second end of the air channel is horizontally displaced from the sump inlet by a portion of the tub bottom.
  • the sump inlet is arranged upstream the air channel along the main drum rotational direction in a spinning phase of a laundry treating process. This avoids air flowing opposite to the stream of the washing liquid during that phase and further improves the draining.
  • the first end of the air channel is formed by an opening in or between side wall parts of a side wall structure of the sump.
  • the second end of the air channel is formed by an opening in a tub bottom.
  • At least a bottom wall of the air channel is inclined with respect to a horizontal plane and in a direction away from the sump inlet.
  • the inclination angle can in particular be between 10° and 60°.
  • a main flow direction of the air bubbles upwardly through the air channel can be at least approximately orthogonal to a main flow direction of the washing liquid towards the sump outlet.
  • An overhang and/or a bridge of the tub bottom is arranged between the air channel and the sump inlet and reaches into the sump defining a horizontal distance between the second end of the air channel and the sump inlet.
  • the overhang and/or bridge preferably extends at least partly over the sump outlet at a pre-determined first vertical distance and/or has at its lowermost area a pre-determined second vertical distance from the sump inlet.
  • the vertical distance of the second end from the first end of the air channel corresponds in particular to the vertical distance of the lowermost area of the overhang and/or bridge from the sump inlet.
  • the overhang and/or bridge defines a horizontal distance between the second end of the air channel and the sump inlet.
  • At least one directing element is arranged
  • the directing element has an impact wall protruding upwardly from the tub bottom towards an outside wall of the drum, but keeping a distance from the outside wall of the drum, and extending continuously to the edge of the sump inlet, thereby directing washing liquid running down the inner tub wall and impacting onto the impact wall directly towards and into the sump inlet.
  • the washing tub is composed of a pre-formed front tub part having a front tub bottom part and a pre-formed rear tub part having a rear tub bottom part, wherein the rear tub part is connected with the front tub part in a connecting area.
  • at least one wall of the air channel is an integral part with the front tub part and the other walls of the air channel are integral parts with the rear tub part.
  • a front side wall part of the side wall structure of the sump is an integral part with the front tub part and wherein the other parts of the side wall structure of the sump are integral parts with the rear tub part.
  • a washing machine comprises a washing tub unit according to the invention.
  • FIG 1 to 6 Identical or at least corresponding parts and quantities in FIG 1 to 6 are designated with the same reference numerals. Reference is made also to the list of reference numerals if a reference numeral is not mentioned in the text.
  • FIG 1 to 3 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 (or: joined) in a connecting (or: joining) 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 (or: joining) 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 rotatable or rotating drum 3, arranged in the tub interior 9 of the washing tub 2 and provided for receiving goods such as laundry to be washed.
  • the inner wall 121 of the washing tub 2 is preferably mainly formed in a cylindrical shape or as a cylindrical surface or wall.
  • the drum 3 is rotatable or can be rotated about a rotational axis RA in at least one, preferably two, rotational direction(s) RD 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 about the rotational axis RA in the at least one, usually two rotational directions RD 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.
  • 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 adjacent to 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.
  • 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 has a draining conduit 75, which is adjacent to the sump 10 and arranged at least partly lower than the sump 10 and its sump bottom 13 there is 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 a draining outlet 74.
  • a central (geometrical) axis A of the draining conduit 75 runs through the central region of the circumferential wall 17 which is preferably parallel to the rotational axis RA of the drum 3 , preferably in a horizontal direction.
  • 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 wall structure of the draining conduit 75 forms itself 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.
  • This design and arrangement of the sump outlet 15 as an, preferably rectangular, opening in a curved, preferably cylindrical, and concave as seen from the sump 10 (or convex as seen from the conduit inner chamber 85) separation wall between the sump 10 and the inner chamber 85 of the conduit 75 leads to very good flow results within the sump 10 and at the same time to a very solid and rigid construction.
  • the sump outlet 15 being oriented towards the sump inlet 18 there is a direct and short flow path for the drained liquid through the sump 10 resulting in less turbulences.
  • 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 (not shown) 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 about a rotational axis which is the central axis A of the draining conduit 75 in the mounted state.
  • a pump receiving part 37 of the conduit 75 receives a pump wheel (not shown) of the pump 70 and carries the drive 71.
  • 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, which is, as seen axially along the central axis A, opposite to the rear end 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 covers 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 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 in the connecting area 20 by hot welding.
  • the whole wall structure of the conduit 75 except for the cover wall 25 is formed integral with the rear tub part 12, i.e. formed in the same material and/or injection-moulding process. Due to the front wall of the conduit 75 formed by the cover wall 25 and the front wall 11E of the sump 10 also formed by the cover wall 25 being planar, preferably lying in the same connecting plane, 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.
  • a directing element 30 is arranged on the tub bottom 12, in particular the front tub bottom 12B, for directing washing liquid L running down the inner wall 121B of the front tub part 22 of the tub 2 into the sump 10.
  • This directing element 30 has an impact wall 31 which can be inclined under an inclination angle ⁇ towards the direction where the washing liquid L comes from as shown, wherein the inclination angle ⁇ can be in particular between 70° and 88°.
  • the washing liquid L impacts or impinges on the impact wall 31 and is re-directed in a flow direction along the impact wall 31 towards the sump 10.
  • the re-directed washing liquid flowing along the impact wall 31 into the sump 10 is designated by L'.
  • the directing element 30 has, in particular, an overhang 32 arranged above the impact wall 31 to catch washing liquid L splashing upwardly when impacting on the impact wall 31 and keep it from spilling over the directing element 30 but rather direct it downward and towards the sump 10.
  • the directing element 30 is preferably formed integral with the tub wall, in particular with the front tub bottom 12B or front tub part 22, and is brought into its position relative to the sump 10 when the front tub part 22 and the rear tub part 21 are connected in the connecting area 20.
  • an overhang (or: balcony-shaped walls structure) 114 extending from the tub bottom 12 down into the sump 10.
  • This overhang 114 extends, with its lower wall, horizontally into the sump 10 starting from the side wall part 11B which it is connected with and overlapping or covering at a vertical distance h1 at least partly the sump outlet 15.
  • a free front wall 116 of the overhang 114 is, in the embodiment shown, parallel to the side wall part 11B and orthogonal to the side wall part 11C of the sump 10 the latter of which the overhang 114 is connected with too.
  • the sump inlet 18 in the tub bottom 12 is arranged between the side wall 11A and the overhang 114 at the level of the tub bottom 12.
  • an air channel 16 is arranged on the opposite side of the overhang 114 .
  • the side wall part 11D of the sump 10 is arranged above the vertical side wall part 11C and in front of the overhang 114 and slopes upwardly from the vertical side wall part 11C.
  • This side wall part 11D forms a bottom wall of the air channel 16.
  • the air channel 16 is sloped with respect to the horizontal plane, pointing away from the sump inlet 18, preferably by an inclination angle 8 which is typically between 10° and 60°, preferably around 30°.
  • A, thus, more or less triangular rear channel wall 115 of the air channel 16 is displaced to the front wall 116 of the overhang 114 in a direction to the front.
  • the front channel wall 117 is connected to the front tub bottom part 12B and thus integral part of the front tub part 21 whereas the other walls of the channel, in particular the rear channel wall 115 and the bottom wall defined by the side wall part 11D, are integral parts with the rear tub part 22 as is the overhang 114.
  • the distance between the front channel wall 117 and the rear channel wall 115 defines a width w of the air channel 16 (see FIG 4 ) which is much smaller than the dimensions of the sump inlet 18.
  • the second end or outlet 16B of the air channel 16 is smaller in its cross section or size than the sump inlet 18 so that, if at all, only a small proportion of washing liquid L can enter the sump 10 through the air channel 16.
  • the main flow of washing liquid L through the sump 10 will be generated by the low pressure in the conduit 75 and take place and be directed between the sump inlet 18 and the sump outlet 15. However, due to turbulences and other effects in the flow air bubbles AB will be generated and be contained in the washing liquid L within the sump 10.
  • the air bubbles AB are also generated by the air flows over the rotating drum in particular when water or washing liquid L is extracted from the laundry by the centrifugal forces.
  • the aforementioned air channel 16 is provided.
  • the air channel 16 has a channel inlet or first end 16A below and in front of the overhang 114, right above the side wall 11C and well below the sump inlet 18 by which inlet or first end 16A the air channel 16 is in fluid communication with the sump 10.
  • the air channel 16 is connected to the tub interior 9.
  • the inlet or first end 16A of the air channel 16 is arranged at a horizontal distance d, defined by the lower wall of the overhang 114, from the sump inlet 18.
  • the outlet or second end 16B of the air channel 16 is arranged at a horizontal distance d, defined by the tub bottom 12 and bridge 14 above the overhang 114, from the sump inlet 18, and the air channel 16 is inclined away from the sump inlet 18.
  • the height or vertical distance h2 of the overhang 114 from the sump inlet 18 corresponds in particular to the vertical distance of the first end 16A from the second end 16B of the air channel 16.
  • the vertical distance or height of the first end 16A above the sump outlet 15 corresponds to h1, wherein typically h1 ⁇ h2 and preferably h1 ⁇ d.
  • the air channel 16 is rather far apart from the direct flow of washing liquid L between sump inlet 18 and sump outlet 15, and, therefore, the washing liquid L in the area of the air channel 16 in particular at its inlet or first end 16A is relatively calm. Therefore, air bubbles AB can, due to their lower weight or mass density compared to the washing liquid L, escape upwardly through the channel 16 in the bubble main flow direction BD designated by arrows and will escape from the washing liquid L at its surface.
  • the air bubbles AB will, depending on the liquid level of the washing liquid L, either join the air in the air channel 16 below the second end 16B or already enter the tub interior 9 when the liquid level has reached the second end 16B already.
  • the inclination by the inclination angle 8 provides a smooth release of air bubbles AB through the air channel 16.
  • the main flow direction BD of the air bubbles AB is in particular approximately orthogonal to the main flow direction MF of the washing liquid L in front of and towards the sump outlet 15.
  • the sump inlet 18 is arranged upstream the air channel 16 along the main rotational direction RD (see Figure 3 ) of the drum 3 during a spinning phase of a laundry treating process.
  • Said main drum rotational direction is the prevalent rotational direction during a spinning period of a laundry treating process.
  • main drum rotational direction RD during a spinning phase is anticlockwise. In this way the water exiting the drum 3 due to centrifugal forces acting on wet laundry is prevented from remaining attached to (i.e.
  • the directing element 30 prevents the washing liquid L from reaching the second end 16B of the air channel 16, thus increasing the air release effect.
  • the draining effect is in particular enhanced during spinning or washing liquid extractions from the laundry at high rotational speeds of the drum.
  • 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 is mounted into the inner chamber 85 of the draining conduit 75 by inserting the filter element through a rear opening of the conduit in an axial direction along the central axis A.
  • 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)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)

Claims (15)

  1. Unité formant cuve de lavage pour machine à laver comprenant
    a) une cuve de lavage (2) comportant un intérieur de cuve (9) et logeant un tambour rotatif (3) destiné à recevoir les produits à laver,
    b) un compartiment de vidange (10) disposé dans une région inférieure de la cuve de lavage (2) et destiné à drainer le liquide de lavage de l'intérieur (9) de la cuve, le compartiment de vidange (10) comportant une entrée de compartiment (18) et une sortie de compartiment (15),
    c) un conduit d'air (16) étant placé en communication fluidique avec le compartiment (10) à une première extrémité (16A) et avec l'intérieur (9) de la cuve à une seconde extrémité (16B), de telle sorte que le conduit d'air (16) libère au moins une partie des bulles d'air (AB) du liquide de lavage (L), qui est contenu dans le compartiment (10) ou qui s'écoule à travers celui-ci, pour les amener à l'intérieur (9) de la cuve.
  2. Unité formant cuve de lavage selon la revendication 1, dans laquelle la première extrémité (16A) du conduit d'air (16) est placée plus bas (h2) que la seconde extrémité (16B) et l'entrée (18) du compartiment, la seconde extrémité (16B) étant déplacée horizontalement (D1) vers l'entrée (18) du compartiment.
  3. Unité formant cuve de lavage selon la revendication 1 ou la revendication 2, dans laquelle la seconde extrémité (16B) du conduit d'air (16) est déplacée horizontalement (d) depuis l'entrée (18) du compartiment d'une partie du fond (12, 14) de la cuve.
  4. Unité formant cuve de lavage selon l'une quelconque des revendications précédentes, dans laquelle l'entrée (18) du compartiment est disposée en amont du conduit d'air (16) dans le sens de rotation principal (RD) du tambour dans une phase d'essorage d'un processus de traitement de linge.
  5. Unité formant cuve de lavage selon l'une des revendications 1 à 4, dans laquelle la première extrémité (16A) du conduit d'air (16) est formée par un orifice ménagé dans ou entre les parties de paroi latérales (11D, 115) d'une structure de paroi latérale (11) du compartiment (10) et/ou la seconde extrémité (16B) du conduit d'air (16) est formée par un orifice ménagé dans un fond (12) de la cuve.
  6. Unité formant cuve de lavage selon l'une quelconque des revendications précédentes, dans laquelle au moins une paroi de fond (11d) du conduit d'air (16) est inclinée par rapport à un plan horizontal en s'écartant de l'entrée (18) du compartiment.
  7. Unité formant cuve de lavage selon la revendication 6, dans laquelle l'angle d'inclinaison (δ) est choisi pour être compris entre 10° et 60°.
  8. Unité formant cuve de lavage selon l'une quelconque des revendications précédentes, dans laquelle le compartiment (10) et le conduit d'air (16) sont définis par des parois (11, 13 ; 115, 11d) déterminant le sens d'écoulement principal (BD) des bulles d'air (AB) vers le haut à travers le conduit d'air (16), le sens d'écoulement des bulles d'air (BD) étant au moins approximativement orthogonal au sens d'écoulement principal du liquide de lavage vers la sortie (15) du compartiment.
  9. Cuve de lavage selon l'une quelconque des revendications précédentes, dans laquelle la saillie (114) et/ou le pont (14) s'étendent au moins partiellement par-dessus la sortie (15) du compartiment à une première distance verticale prédéterminée (h1) et/ou se trouve au niveau de sa zone la plus inférieure à une seconde distance verticale prédéterminée (h2) de l'entrée (18) du compartiment.
  10. Cuve de lavage selon la revendication 9, dans laquelle la distance verticale (h2) de la seconde extrémité (16B) à la première extrémité (16A) du conduit d'air (16) correspond à la distance verticale de la zone la plus inférieure de la saillie (114) et/ou du pont (14) de l'entrée (18) du compartiment.
  11. Cuve de lavage selon l'une quelconque des revendications précédentes, dans laquelle la saillie (114) et/ou le pont (14) comportent une paroi inférieure qui s'étend horizontalement jusque dans le compartiment (10) en partant d'une structure de paroi latérale (11B) du compartiment (10).
  12. Unité formant cuve de lavage selon la revendication 11, dans laquelle la saillie (114) comporte une extrémité de paroi avant libre (116) qui est parallèle à ladite structure de paroi latérale (11B), qui est orthogonale à une partie de paroi latérale (11C) du compartiment (10) et qui est raccordée à ladite partie de paroi latérale (11C).
  13. Unité de cuve de lavage selon l'une quelconque des revendications précédentes, dans laquelle
    a) au moins un élément de guidage (30) est disposé sur le fond (12) de cuve près de l'entrée (18) du compartiment,
    b) l'élément de guidage (30) comportant une paroi d'impact (31) faisant saillie vers le haut depuis le fond (12) de la cuve en direction d'une paroi extérieure du tambour (3) tout en gardant une certaine distance par rapport à la paroi extérieure du tambour (3) et s'étendant en continu jusqu'au bord de l'orifice d'entrée (18) du compartiment, de façon à guider le liquide de lavage, qui s'écoule en bas de paroi intérieure (121) de la cuve et vient heurter la paroi d'impact (31), directement vers l'entrée (18) du compartiment jusque dans celui-ci.
  14. Unité formant cuve de lavage selon l'une quelconque des revendications précédentes,
    a) la cuve de lavage (2) étant constituée d'une partie de cuve avant préformée (21) comportant une partie de fond de cuve avant (12B) et une partie de cuve arrière préformée (22) comportant une partie de fond de cuve arrière (12A), la partie de cuve arrière (22) étant raccordée à la partie de cuve avant (21) dans une zone de raccordement (20),
    b) au moins une paroi (117) du conduit d'air (16) faisant partie intégrante de la partie de cuve avant (21) et les autres parois (11D, 115) du conduit d'air (16) font partie intégrante de la partie de cuve arrière (21) et/ou
    c) une partie de paroi latérale avant (11E) de la structure de paroi latérale (11) du compartiment (10) fait partie intégrante de la partie de cuve avant (21) et les autres parties (11A à 11D) de la structure de paroi latérale (11) du compartiment (10) font partie intégrante de la partie de cuve arrière (22).
  15. Machine à laver caractérisée en ce qu'elle comprend une unité formant cuve de lavage selon l'une quelconque des revendications 1 à 14.
EP12157041.0A 2012-02-27 2012-02-27 Cuve de lavage et machine à laver Not-in-force EP2631344B1 (fr)

Priority Applications (1)

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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12157041.0A EP2631344B1 (fr) 2012-02-27 2012-02-27 Cuve de lavage et machine à laver

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EP2631344B1 true EP2631344B1 (fr) 2015-07-01

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6574996B1 (en) * 1997-05-30 2003-06-10 General Electric Company Tub sump dam
TR201007806A2 (tr) * 2010-09-23 2010-12-21 Vestel Beyaz Eşya Sanayi̇ Ve Ti̇caret Anoni̇m Şi̇rketi̇@ Çamaşır yıkama makinalari için deterjan çözdürme kısmı

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