EP0124939B1 - Washing machine with a tub comprising a part made of synthetic material - Google Patents

Washing machine with a tub comprising a part made of synthetic material Download PDF

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Publication number
EP0124939B1
EP0124939B1 EP19840200626 EP84200626A EP0124939B1 EP 0124939 B1 EP0124939 B1 EP 0124939B1 EP 19840200626 EP19840200626 EP 19840200626 EP 84200626 A EP84200626 A EP 84200626A EP 0124939 B1 EP0124939 B1 EP 0124939B1
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EP
European Patent Office
Prior art keywords
tub
cover
washing machine
seal
vessel
Prior art date
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Expired
Application number
EP19840200626
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German (de)
French (fr)
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EP0124939A1 (en
Inventor
Bernard Fialon
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.)
Whirlpool International BV
Original Assignee
CONSTRUCTIONS ELECTRO-MECANIQUES D'AMIENS
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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Publication of EP0124939A1 publication Critical patent/EP0124939A1/en
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    • 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

Definitions

  • the invention relates to a washing machine with a drum with a horizontal axis rotatably mounted in a tank intended to receive the washing and rinsing water, said tank being liable to undergo rapid and significant variations in temperature during filling.
  • water said tank consisting of at least two separable parts, on the one hand a body, with a substantially cylindrical horizontal shell, provided with a substantially vertical bottom, and on the other hand a cover capable of closing the body to the opposite from the bottom, body and cover being tightened one against the other for the assembly of the tank and cooperating by peripheral ribs and grooves axially pressing an elastic seal, at least one of the two separable parts of the tank being made of a thick synthetic material.
  • a washing machine with a drum with a horizontal axis rotatably mounted in a tank intended to receive the washing and rinsing water, said tank being liable to undergo rapid and significant variations in temperature during filling.
  • water said tank consisting of at least two separable parts, on the one hand a
  • the two parts of the tank in contact are made of synthetic material (organic macromolecular compound).
  • a bead at the periphery of the body shell is hollowed out of a groove containing the seal, bead and seal bearing against a flat radial surface of the cover.
  • the cover is further provided with a peripheral centering rib. Body and cover are held together by a V-section ring.
  • the plastic cover is lined with a metal flange on which the assembly ring is supported.
  • the temperature cycle to which a washing machine is subjected comprises for example a slow heating of the water from 15 ° C. to possibly 95 ° C., followed by additional filling with cold water in order to rapid cooling to 60 ° C before emptying, which is followed by filling with cold water of a first rinse water.
  • the phenomenon can be analyzed by measuring the angle between the two assembled tank parts, body shell and cover, in the vicinity of the assembly area. For example, this measurement can be carried out by means of a strain gauge bridge bonded to an elastic jumper pressing the two parts against each other. It appears that the constraints of thermal origin rotate these areas around an axis tangent to the periphery of the assembled parts.
  • Displacements of 0.6 mm were measured in a few seconds at the joint.
  • the body and the cover are supported one on the other on either side of the joint, any deformation of one of these two parts creates a decompression of the joint. If the decompression is abrupt, the joint, by expanding only slowly, lets out a certain amount of water.
  • the invention aims to eliminate this incident.
  • a washing machine of the type described in the preamble it is characterized in that the body and the cover are tightened elastically against each other and in contact on a single rigid peripheral stop located on one side of said seal, and in that this body and this cover, capable of being deformed during rapid variations in their temperature, are relative to each other, movable by pivoting around said stop under the effect of said variations temperature in the direction which increases the compression of the joint. It is within the reach of the skilled person to determine what is the direction of the deformations of the synthetic material generated by the thermal gradient appearing during a thermal shock, for example with the measurement method cited above.
  • the invention in particular avoids the use of a counter cover and a metal hoop, as illustrated by the German utility model 1 885 212, which, in addition to their cost, presents the risk of forcing the synthetic material to progressive creep, which would compromise waterproofing on a permanent basis.
  • the deformation corresponds to an abrupt contraction of the material close to its internal surface whereas near the external surface the temperature acquired during the washing of the linen keeps the material expanded for a certain time: several seconds or tens of seconds.
  • This generally results in a rotation of the assembled elements and their convexity bulging facing outwards from the tank.
  • the tank-lid contact stop is located inside the tank relative to the peripheral seal, the bulging has the effect of compressing the seal at the time of the thermal shock .
  • the thermal shock can come from filling a cold tank (around 20 ° C) with hot water (60 ° C for example).
  • the rotation of the assembled parts is generally reverse creating a convexity turned towards the interior of the tank.
  • the tank-lid contact stop is located outside the tank relative to the peripheral seal, the deformation also compresses the seal at the time of thermal shock.
  • the tank-cover assembly is maintained by elastic jumpers, the ends of which bear respectively on the tank shell and the cover at points substantially aligned with the tank contact stop. -lid.
  • This arrangement keeps the elastic pressure of the jumpers substantially constant during the bulging of the assembled parts. In addition, it avoids the creep of the synthetic material in line with said jumpers, creep which would occur if the points of application of the jumpers were cantilevered.
  • the figures illustrate an example of a washing machine intended to be supplied with cold water exclusively. This is a top-loading washing machine with a rotary drum with a horizontal axis.
  • Figure 1 shows a tank made up of two parts in lightened polypropylene with a general thickness of 6 mm.
  • a first part 1, or body consisting of a substantially cylindrical ferrule 2 of substantially horizontal generatrices, provided with a bottom 3 carrying in its center a bearing housing for the drum 4.
  • a second part or cover 5 capable of closing the body and also carrying in its center a bearing housing for the drum 4.
  • the ferrule 2 receives at its top a hopper 6 for loading the laundry, corresponding to a door (not shown) of the drum 4.
  • the drum consists at least partially of perforated stainless steel sheet.
  • the tank cover 5 is provided with a centering rib 7, the external contour of which corresponds to the internal contour of the shell 2.
  • the cover On the outside of this rib 7, the cover has an annular surface 8 that is planar, radial, that is ie perpendicular to the direction of the generatrices of the cylindrical shell.
  • the tank shell has its wall ending in a radial plane with an edge 9 intended to abut on the annular surface 8 of the cover, during assembly of the tank.
  • the ferrule On the outside of this edge 9, the ferrule has, on its periphery, a rib 10 whose longitudinal extension 14 towards the cover is set back relative to the edge 9 and which forms an angle opposite the cover acute with the ferrule surface. Facing the cover, the rib 10 has a peripheral groove receiving an elastic seal 11.
  • the cover is pressed against the edge 9 forming a stop, against the elasticity of the seal 11.
  • the assembly is held by elastic jumpers or staples 12 distributed on the outskirts. These jumpers 12 are anchored on the one hand in the acute angle formed by the rib 10 with the shell surface 2, and on the other hand in a recess 13 hollowed out on the surface of the cover.
  • the recess 13 is located in such a way that the elastic force exerted by each rider 12 passes substantially through the abutment zone of the edge 9 against the surface 8, along the axis XX shown in FIG. 2.
  • the behavior of a machine according to the invention as described above is as follows.
  • the washing water is admitted cold (10 to 15 ° C) into the tank and mixed with the washing products. It is then heated by means of an electrical resistance (not shown) to the desired washing temperature, which can reach 95 ° C.
  • This heating is slow, its duration depends on the quantities of laundry and water, the initial and final temperatures of the water, but it is about 10 to 30 minutes.
  • the mass of polypropylene in the tank wall has reached an almost uniform temperature close to that of water.
  • the slowness of the heating is such that the temperature gradient in the polypropylene remains low, therefore that the deformations remain slow and weak (compression of the joint slowly decreasing by at most 0.1 mm).
  • the resilience of the material constituting the seal such as cellular synthetic rubber, is high enough for the seal to compensate for this slow and weak deformation and maintain the tightness of the tank.

Description

L'invention concerne une machine à laver le linge à tambour à axe horizontal monté à rotation dans une cuve destinée à recevoir l'eau de lavage et de rinçage, ladite cuve étant susceptible de subir de rapides et importantes variations de température lors de remplissages en eau, ladite cuve étant constituée d'au moins deux parties dissociables, d'une part un corps, à virole sensiblement cylindrique horizontale, muni d'un fond sensiblement vertical, et d'autre part un couvercle susceptible de fermer le corps à l'opposé du fond, corps et couvercle étant serrés l'un contre l'autre pour l'assemblage de la cuve et coopérant par des nervures et rainures périphériques pressant axialement un joint d'étanchéité élastique, au moins l'une des deux parties dissociables de la cuve étant réalisée en une matière synthétique épaisse. Une telle machine est par exemple décrite dans le modèle d'utilité allemand n° 1 885 212. Dans cet exemple, les deux parties de la cuve en contact sont réalisées en matière synthétique (composé macromoléculaire organique). Un bourrelet à la périphérie de la virole du corps est creusé d'une rainure contenant le joint, bourrelet et joint portant contre une surface radiale plane du couvercle. Le couvercle est en outre muni d'une nervure périphérique de centrage. Corps et couvercle sont maintenus assemblés par un anneau à section en V. Le couvercle en matière synthétique est doublé d'un flasque métallique sur lequel prend appui l'anneau d'assemblage.The invention relates to a washing machine with a drum with a horizontal axis rotatably mounted in a tank intended to receive the washing and rinsing water, said tank being liable to undergo rapid and significant variations in temperature during filling. water, said tank consisting of at least two separable parts, on the one hand a body, with a substantially cylindrical horizontal shell, provided with a substantially vertical bottom, and on the other hand a cover capable of closing the body to the opposite from the bottom, body and cover being tightened one against the other for the assembly of the tank and cooperating by peripheral ribs and grooves axially pressing an elastic seal, at least one of the two separable parts of the tank being made of a thick synthetic material. Such a machine is for example described in the German utility model No. 1 885 212. In this example, the two parts of the tank in contact are made of synthetic material (organic macromolecular compound). A bead at the periphery of the body shell is hollowed out of a groove containing the seal, bead and seal bearing against a flat radial surface of the cover. The cover is further provided with a peripheral centering rib. Body and cover are held together by a V-section ring. The plastic cover is lined with a metal flange on which the assembly ring is supported.

Une telle réalisation s'inspire de la traditionnelle fabrication d'une cuve en métal. Elle ne tient pas compte du comportement physique des matières synthétiques, à savoir : la tendance au fluage, ou déformation permanente, en particulier à chaud, la mauvaise conductibilité thermique et un important coefficient de dilatation thermique, qui génèrent dans la masse de la matière synthétique, lors des rapides variations de température, des gradients thermiques et des contraintes engendrant des déformations, réversibles ou non. Le tableau ci-dessous permet de comparer les propriétés d'un matériau synthétique tel qu'un polypropylène allégé à un acier normal, en donnant des ordres de grandeur :

Figure imgb0001
Such an achievement is inspired by the traditional manufacture of a metal tank. It does not take into account the physical behavior of synthetic materials, namely: the tendency to creep, or permanent deformation, in particular when hot, poor thermal conductivity and a large coefficient of thermal expansion, which generate in the mass of synthetic material , during rapid temperature variations, thermal gradients and stresses causing deformations, reversible or not. The table below compares the properties of a synthetic material such as light polypropylene to normal steel, by giving orders of magnitude:
Figure imgb0001

Le cycle de températures auquel est soumis une machine à laver le linge comporte par exemple un chauffage lent de l'eau depuis 15 °C jusqu'à éventuellement 95 °C, suivi d'un remplissage complémentaire à l'eau froide en vue d'un refroidissement rapide à 60 °C avant vidange, laquelle est suivie d'un remplissage à l'eau froide d'une première eau de rinçage. Lors des refroidissements brusques de la cuve d'une machine telle que décrite ci-dessus, on a observé d'importantes fuites d'eau. Le phénomène peut être analysé en mesurant l'angle que font entre elles les deux parties de cuve assemblées, virole du corps et couvercle, au voisinage de la zone d'assemblage. Par exemple cette mesure peut être effectuée au moyen d'un pont de jauges de contraintes collé sur un cavalier élastique pressant les deux parties l'une contre l'autre. Il apparait que les contraintes d'origine thermique font pivoter ces zones autour d'un axe tangent à la périphérie des parties assemblées. On a mesuré des déplacements de 0,6 mm en quelques secondes au niveau du joint. Dans l'exemple du modèle d'utilité allemand 1 885 212, le corps et le couvercle sont en appui l'un sur l'autre de part et d'autre du joint, toute déformation de l'une de ces deux parties crée une décompression du joint. Si la décompression est brusque, le joint, en ne se dilatant que lentement, laisse s'écouler une certaine quantité d'eau.The temperature cycle to which a washing machine is subjected comprises for example a slow heating of the water from 15 ° C. to possibly 95 ° C., followed by additional filling with cold water in order to rapid cooling to 60 ° C before emptying, which is followed by filling with cold water of a first rinse water. During the sudden cooling of the tank of a machine as described above, large water leaks were observed. The phenomenon can be analyzed by measuring the angle between the two assembled tank parts, body shell and cover, in the vicinity of the assembly area. For example, this measurement can be carried out by means of a strain gauge bridge bonded to an elastic jumper pressing the two parts against each other. It appears that the constraints of thermal origin rotate these areas around an axis tangent to the periphery of the assembled parts. Displacements of 0.6 mm were measured in a few seconds at the joint. In the example of the German utility model 1 885 212, the body and the cover are supported one on the other on either side of the joint, any deformation of one of these two parts creates a decompression of the joint. If the decompression is abrupt, the joint, by expanding only slowly, lets out a certain amount of water.

L'invention vise à supprimer cet incident. Dans une machine à laver du type de celle décrite dans le préambule, elle se caractérise par le fait que le corps et le couvercle sont serrés élastiquement l'un contre l'autre et en contact sur une butée périphérique rigide unique située d'un côté dudit joint, et en ce que ce corps et ce couvercle, susceptibles d'être déformés lors de variations rapides de leur température, sont l'un par rapport à l'autre, mobiles par pivotement autour de ladite butée sous l'effet desdites variations de température dans le sens qui accentue la compression du joint. Il est à la portée de l'homme de métier de déterminer quel est le sens des déformations de la matière synthétique engendrées par le gradient thermique apparaissant lors d'un choc thermique, par exemple avec la méthode de mesure citée ci-dessus. L'invention évite notamment d'utiliser un contre-couvercle et un cerclage métallique, tels qu'illustrés par le modèle d'utilité allemand 1 885 212, qui, outre leur coût, présentent le risque de contraindre la matière synthétique au fluage progressif, ce qui compromettrait l'étanchéité à titre permanent.The invention aims to eliminate this incident. In a washing machine of the type described in the preamble, it is characterized in that the body and the cover are tightened elastically against each other and in contact on a single rigid peripheral stop located on one side of said seal, and in that this body and this cover, capable of being deformed during rapid variations in their temperature, are relative to each other, movable by pivoting around said stop under the effect of said variations temperature in the direction which increases the compression of the joint. It is within the reach of the skilled person to determine what is the direction of the deformations of the synthetic material generated by the thermal gradient appearing during a thermal shock, for example with the measurement method cited above. The invention in particular avoids the use of a counter cover and a metal hoop, as illustrated by the German utility model 1 885 212, which, in addition to their cost, presents the risk of forcing the synthetic material to progressive creep, which would compromise waterproofing on a permanent basis.

En particulier dans le cas d'une machine à laver dont la cuve est remplie en eau froide et subissant des cycles thermiques tels que décrits plus haut, la déformation correspond à une contraction brusque de la matière proche de sa surface interne alors qu'à proximité de la surface externe la température acquise lors du lavage du linge maintient la matière dilatée pendant un certain temps : plusieurs secondes ou dizaines de secondes. Il en résulte généralement une rotation des éléments assemblés et leur bombement de convexité tournée vers l'extérieur de la cuve. Dans ces conditions si, dans une machine conforme à l'invention, la butée de contact cuve-couvercle est située à l'intérieur de la cuve par rapport au joint périphérique, le bombement a pour effet de compresser le joint au moment du choc thermique.In particular in the case of a washing machine whose tub is filled with cold water and undergoing thermal cycles as described above, the deformation corresponds to an abrupt contraction of the material close to its internal surface whereas near the external surface the temperature acquired during the washing of the linen keeps the material expanded for a certain time: several seconds or tens of seconds. This generally results in a rotation of the assembled elements and their convexity bulging facing outwards from the tank. Under these conditions if, in a machine according to the invention, the tank-lid contact stop is located inside the tank relative to the peripheral seal, the bulging has the effect of compressing the seal at the time of the thermal shock .

Dans un autre cas particulier, le choc thermique peut provenir du remplissage d'une cuve froide (20 °C environ) avec de l'eau chaude (60 °C par exemple). Dans cette hypothèse, la rotation des pièces assemblées est généralement inverse créant une convexité tournée vers l'intérieur de la cuve. Si dans une machine conforme à l'invention, la butée de contact cuve-couvercle est située à l'extérieur de la cuve par rapport au joint périphérique, la déformation comprime également le joint au moment du choc thermique.In another particular case, the thermal shock can come from filling a cold tank (around 20 ° C) with hot water (60 ° C for example). In this hypothesis, the rotation of the assembled parts is generally reverse creating a convexity turned towards the interior of the tank. If in a machine according to the invention, the tank-lid contact stop is located outside the tank relative to the peripheral seal, the deformation also compresses the seal at the time of thermal shock.

Dans un mode de réalisation particulièrement recommandé de l'invention, l'assemblage cuve-couvercle est maintenu par des cavaliers élastiques dont les extrémités sont en appui respectivement sur la virole de cuve et le couvercle en des points sensiblement alignés avec la butée de contact cuve-couvercle. Cette disposition maintient sensiblement constante la pression élastique des cavaliers lors du bombement des pièces assemblées. De plus, elle évite le fluage de la matière synthétique au droit desdits cavaliers, fluage qui se produirait si les points d'application des cavaliers étaient en porte-à-faux.In a particularly recommended embodiment of the invention, the tank-cover assembly is maintained by elastic jumpers, the ends of which bear respectively on the tank shell and the cover at points substantially aligned with the tank contact stop. -lid. This arrangement keeps the elastic pressure of the jumpers substantially constant during the bulging of the assembled parts. In addition, it avoids the creep of the synthetic material in line with said jumpers, creep which would occur if the points of application of the jumpers were cantilevered.

La description qui suit et les dessins illustrent un exemple de réalisation de l'invention.

  • La figure 1 est une vue en coupe longitudinale partielle d'une cuve de machine à laver le linge conforme à l'invention.
  • La figure 2 est une coupe grossie de la zone de raccordement des deux parties de la cuve de la figure 1.
  • La figure 3 est une coupe identique à la figure 2 dans laquelle les déformations dues à un choc thermique ont été exagérées.
The following description and the drawings illustrate an exemplary embodiment of the invention.
  • Figure 1 is a partial longitudinal sectional view of a tank of a washing machine according to the invention.
  • Figure 2 is an enlarged section of the connection area of the two parts of the tank of Figure 1.
  • Figure 3 is a section identical to Figure 2 in which the deformations due to thermal shock have been exaggerated.

Les figures illustrent un exemple de machine à laver destinée à être alimentée en eau froide exclusivement. Il s'agit d'une machine à laver à chargement par le dessus, à tambour rotatif à axe horizontal.The figures illustrate an example of a washing machine intended to be supplied with cold water exclusively. This is a top-loading washing machine with a rotary drum with a horizontal axis.

La figure 1 montre une cuve constituée de deux parties en polypropylène allégé d'épaisseur générale 6 mm. Une première partie 1, ou corps, constituée d'une virole sensiblement cylindrique 2 de génératrices sensiblement horizontales, munie d'un fond 3 portant en son centre un logement de palier pour le tambour 4. Une seconde partie ou couvercle 5 susceptible de fermer le corps et portant également en son centre un logement de palier pour le tambour 4. La virole 2 reçoit en son sommet une trémie 6 pour le chargement du linge, correspondant à une porte (non représentée) du tambour 4. Le tambour est constitué au moins partiellement de tôle d'acier inoxydable perforée.Figure 1 shows a tank made up of two parts in lightened polypropylene with a general thickness of 6 mm. A first part 1, or body, consisting of a substantially cylindrical ferrule 2 of substantially horizontal generatrices, provided with a bottom 3 carrying in its center a bearing housing for the drum 4. A second part or cover 5 capable of closing the body and also carrying in its center a bearing housing for the drum 4. The ferrule 2 receives at its top a hopper 6 for loading the laundry, corresponding to a door (not shown) of the drum 4. The drum consists at least partially of perforated stainless steel sheet.

Le couvercle de cuve 5 est doté d'une nervure de centrage 7 dont le contour extérieur correspond au contour intérieur de la virole 2. A l'extérieur de cette nervure 7, le couvercle présente une surface annulaire 8 plane radiale, c'est-à-dire perpendiculaire à la direction des génératrices de la virole cylindrique.The tank cover 5 is provided with a centering rib 7, the external contour of which corresponds to the internal contour of the shell 2. On the outside of this rib 7, the cover has an annular surface 8 that is planar, radial, that is ie perpendicular to the direction of the generatrices of the cylindrical shell.

La virole de cuve a sa paroi se terminant dans un plan radial par une arête 9 destinée à venir buter sur la surface annulaire 8 du couvercle, lors de l'assemblage de la cuve. A l'extérieur de cette arête 9, la virole comporte, sur sa périphérie, une nervure 10 dont l'extension longitudinale 14 vers le couvercle est en retrait par rapport à l'arête 9 et qui forme à l'opposé du couvercle un angle aigu avec la surface de virole. Face au couvercle, la nervure 10 présente une rainure périphérique recevant un joint élastique 11.The tank shell has its wall ending in a radial plane with an edge 9 intended to abut on the annular surface 8 of the cover, during assembly of the tank. On the outside of this edge 9, the ferrule has, on its periphery, a rib 10 whose longitudinal extension 14 towards the cover is set back relative to the edge 9 and which forms an angle opposite the cover acute with the ferrule surface. Facing the cover, the rib 10 has a peripheral groove receiving an elastic seal 11.

Pour l'assemblage des deux parties de cuve 2 et 5, le couvercle est pressé contre l'arête 9 formant butée, à l'encontre de l'élasticité du joint 11. L'assemblage est maintenu par des cavaliers élastiques ou agrafes 12 répartis à la périphérie. Ces cavaliers 12 sont ancrés d'une part dans l'angle aigu formé par la nervure 10 avec la surface de virole 2, et d'autre part dans un évidement 13 creusé à la surface du couvercle. L'évidement 13 est localisé de telle façon que la force élastique exercée par chaque cavalier 12 passe sensiblement par la zone de butée de l'arête 9 contre la surface 8, selon l'axe XX représenté sur la figure 2.For the assembly of the two tank parts 2 and 5, the cover is pressed against the edge 9 forming a stop, against the elasticity of the seal 11. The assembly is held by elastic jumpers or staples 12 distributed on the outskirts. These jumpers 12 are anchored on the one hand in the acute angle formed by the rib 10 with the shell surface 2, and on the other hand in a recess 13 hollowed out on the surface of the cover. The recess 13 is located in such a way that the elastic force exerted by each rider 12 passes substantially through the abutment zone of the edge 9 against the surface 8, along the axis XX shown in FIG. 2.

Au cours des opérations de lavage et de rinçage, le comportement d'une machine conforme à l'invention telle que décrite ci-dessus est le suivant. L'eau de lavage est admise froide (10 à 15 °C) dans la cuve et mélangée aux produits de lavage. Elle est ensuite chauffée au moyen d'une résistance électrique (non représentée) jusqu'à la température de lavage désirée, qui peut atteindre 95 °C. Ce chauffage est lent, sa durée dépend des quantités de linge et d'eau, des températures initiale et finale de l'eau, mais elle est de 10 à 30 minutes environ. A la fin de cette phase, la masse du polypropylène de la paroi de cuve a atteint une température presque uniforme et voisine de celle de l'eau. La lenteur du chauffage est telle que le gradient de température dans le polypropylène reste faible, donc que les déformations restent lentes et faibles (compression du joint diminuant lentement d'au plus 0,1 mm). La résilience du matériau constituant le joint, tel qu'un caoutchouc synthétique cellulaire, est suffisamment élevée pour que le joint compense cette déformation lente et faible et maintienne l'étanchéité de la cuve.During washing and rinsing operations, the behavior of a machine according to the invention as described above is as follows. The washing water is admitted cold (10 to 15 ° C) into the tank and mixed with the washing products. It is then heated by means of an electrical resistance (not shown) to the desired washing temperature, which can reach 95 ° C. This heating is slow, its duration depends on the quantities of laundry and water, the initial and final temperatures of the water, but it is about 10 to 30 minutes. At the end of this phase, the mass of polypropylene in the tank wall has reached an almost uniform temperature close to that of water. The slowness of the heating is such that the temperature gradient in the polypropylene remains low, therefore that the deformations remain slow and weak (compression of the joint slowly decreasing by at most 0.1 mm). The resilience of the material constituting the seal, such as cellular synthetic rubber, is high enough for the seal to compensate for this slow and weak deformation and maintain the tightness of the tank.

Lorsque le lavage est terminé la cuve est vidangée, éventuellement après refroidissement partiel du bain par addition d'eau froide. La cuve est ensuite remplie à nouveau d'eau froide pour le premier rinçage du linge. C'est au cours de cette première admission d'eau froide (pour refroidissement ou rinçage) dans la cuve chaude que se produit le choc thermique décrit plus haut, la cuve se déformant rapidement et momentanément comme indiqué de façon exagérée figure 3. Sur une cuve de machine à laver conforme à l'invention cette déformation correspond à une rotation autour de la zone de contact 8, 9 du couvercle et du corps de cuve, conduisant à la compression brusque du joint 11, ce qui renforce l'étanchéité. La déformation inverse (retour à la figure 2) se fait lentement, elle correspond au refroidissement complet de la masse de polypropylène.When the washing is finished the tank is emptied, possibly after partial cooling of the bath by addition of cold water. The tub is then refilled with cold water for the first rinse of the laundry. It is during this first cold water intake (for cooling or rinsing) in the hot tub that the thermal shock described above occurs, the tank deforming quickly and momentarily as indicated in an exaggerated manner in Figure 3. On a washing machine tank according to the invention this deformation corresponds to a rotation around the area contact 8, 9 of the cover and of the tank body, leading to sudden compression of the seal 11, which strengthens the seal. The reverse deformation (return to Figure 2) is done slowly, it corresponds to the complete cooling of the polypropylene mass.

Claims (4)

1. A laundry washing machine having a drum with a horizontal shaft, which drum is mounted for rotation in a tub for receiving the washing and rinsing water, which tub is subject to rapid and substantial temperature variations when it is filled with water and comprises at least two separable parts, that is a vessel, comprising a substantially cylindrical horizontal shell provided with a substantially vertical back, and a cover by means of which the vessel can be closed at the side facing the back, said vessel and cover being clamped against one another to form the tub assembly and co-operating with each other by peripheral ribs and grooves which axially compress an elastic seal, at least one of the two separable parts of the tub being made of a thick synthetic material, characterized in that the vessel and the cover are elastically clamped against one another and are in contact with a single rigid peripheral abutment situated at one side of said seal, and in that the vessel and the cover, which are subject to deformation during rapid temperature variations, can perform a pivotal movement relative to each other about said abutment in a direction which promotes compression of the seal under the influence of said temperature variations.
2. A washing machine as claimed in claim 1, having a tub which is filled with cold water, characterized by the fact that the abutment which is in contact with the tub and cover is situated at the innerside of the tub relative to the peripheral seal.
3. A washing machine as claimed in claim 1, having a tub which is filled with hot water, characterized by the fact that the abutment which is in contact with the tub and cover is situated at the outer side of the tub relative to the peripheral seal.
4. A washing machine as claimed in anyone of the claims 1-3, characterized in that the tub and cover are assembled to each other by elastic fasteners (12) whose ends respectively bear against the shell (2) and the cover at points which are substantially in line with the abutment which is in contact with the tub and cover.
EP19840200626 1983-05-06 1984-05-03 Washing machine with a tub comprising a part made of synthetic material Expired EP0124939B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8307585A FR2545512B1 (en) 1983-05-06 1983-05-06 TANK WASHING MACHINE COMPRISING A PART OF SYNTHETIC MATERIAL
FR8307585 1983-05-06

Publications (2)

Publication Number Publication Date
EP0124939A1 EP0124939A1 (en) 1984-11-14
EP0124939B1 true EP0124939B1 (en) 1988-01-20

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EP19840200626 Expired EP0124939B1 (en) 1983-05-06 1984-05-03 Washing machine with a tub comprising a part made of synthetic material

Country Status (3)

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EP (1) EP0124939B1 (en)
DE (1) DE3468911D1 (en)
FR (1) FR2545512B1 (en)

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US7571625B2 (en) 2002-12-27 2009-08-11 Lg Electronics Inc. Drum type washing machine
US7827834B2 (en) 2005-09-30 2010-11-09 Lg Electronics Inc. Bearing housing assembly of drum-type washing machine and drum-type washing machine with the same
US7841220B2 (en) 2005-09-30 2010-11-30 Lg Electronics Inc. Drum-type washing machine
USRE43625E1 (en) 2006-03-29 2012-09-04 Lg Electronics Inc. Drum type washing machine
US8429938B2 (en) 2004-07-20 2013-04-30 Lg Electronics Inc. Drum-type washing machine and bearing housing structure thereof
US8671719B2 (en) 2002-12-27 2014-03-18 Lg Electronics Inc. Drum type washing machine

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FR2606798B1 (en) * 1986-11-18 1989-01-13 Ciapem WASHING MACHINE PROVIDED WITH A SYNTHETIC TANK
IT1259238B (en) * 1992-12-07 1996-03-11 Zanussi Elettrodomestici WASHING MACHINE WITH PERFECTED PLASTIC TANK.
GB2307484B (en) * 1995-11-25 1999-11-17 David Scott Washing machine drum cover
KR100457555B1 (en) * 2002-02-26 2004-11-17 엘지전자 주식회사 Tub-seal for drum washer
CN107651331B (en) * 2017-11-02 2023-01-06 优捷特环保科技有限公司 Well cover for gas station and oil tank field detection well
DE102021205433A1 (en) * 2021-05-28 2022-12-01 BSH Hausgeräte GmbH Tub with a specific connection area between a hollow cylinder and a rear wall, and household appliance

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FR1215057A (en) * 1958-10-31 1960-04-13 Esswein & Cie Washing machine tub
DE1885212U (en) * 1961-12-09 1964-01-02 Constructa Werke G M B H OUTER DRUM FOR HOUSEHOLD WASHING AND SPINNING MACHINES.
FR1513957A (en) * 1966-03-10 1968-02-16 Bosch Hausgeraete Gmbh Washing machine
DE1760274A1 (en) * 1968-04-26 1971-12-23 Siemens Elektrogeraete Gmbh Lye container with a detachable end base for a washing machine with spin cycle
IT1067355B (en) * 1976-08-02 1985-03-16 Eurodomestici Ind Riunite TANK FOR WASHING MACHINE

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US8887538B2 (en) 2004-07-20 2014-11-18 Lg Electronics Inc. Drum-type washing machine and bearing housing structure thereof
US8671718B2 (en) 2005-09-30 2014-03-18 Lg Electronics Inc. Drum-type washing machine
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US8220294B2 (en) 2005-09-30 2012-07-17 Lg Electronics Inc. Drum-type washing machine
US7841220B2 (en) 2005-09-30 2010-11-30 Lg Electronics Inc. Drum-type washing machine
US7827834B2 (en) 2005-09-30 2010-11-09 Lg Electronics Inc. Bearing housing assembly of drum-type washing machine and drum-type washing machine with the same
USRE44795E1 (en) 2006-03-29 2014-03-11 Lg Electronics Inc. Drum type washing machine
USRE44674E1 (en) 2006-03-29 2013-12-31 Lg Electronics Inc. Drum type washing machine
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USRE43625E1 (en) 2006-03-29 2012-09-04 Lg Electronics Inc. Drum type washing machine

Also Published As

Publication number Publication date
EP0124939A1 (en) 1984-11-14
FR2545512A1 (en) 1984-11-09
DE3468911D1 (en) 1988-02-25
FR2545512B1 (en) 1985-07-12

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