EP3309290A1 - Horizontal drum washing machine with washing liquid recirculation system - Google Patents
Horizontal drum washing machine with washing liquid recirculation system Download PDFInfo
- Publication number
- EP3309290A1 EP3309290A1 EP16193972.3A EP16193972A EP3309290A1 EP 3309290 A1 EP3309290 A1 EP 3309290A1 EP 16193972 A EP16193972 A EP 16193972A EP 3309290 A1 EP3309290 A1 EP 3309290A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzles
- passages
- drum
- machine
- group
- 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
Links
- 238000005406 washing Methods 0.000 title claims abstract description 51
- 239000007788 liquid Substances 0.000 title claims abstract description 24
- 239000012530 fluid Substances 0.000 claims abstract description 8
- 230000003134 recirculating effect Effects 0.000 claims abstract description 8
- 238000004891 communication Methods 0.000 claims abstract description 7
- 238000003491 array Methods 0.000 claims description 8
- 239000003599 detergent Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000004090 dissolution Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
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
-
- 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
- D06F37/02—Rotary receptacles, e.g. drums
- D06F37/04—Rotary receptacles, e.g. drums adapted for rotation or oscillation about a horizontal or inclined axis
-
- 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
Abstract
Description
- The present invention relates to a horizontal drum washing machine (and washer-dryer) comprising a cabinet, a tub mounted in the cabinet, a drum rotatably mounted within said tub about a horizontal axis. Preferably, the present invention relates to a top-loading washer comprising a tub mounted in the cabinet with an access opening, a perforated drum rotatably mounted within said tub about a horizontal axis and having an aperture on its cylindrical side, one or two drum door/s supported by the drum for opening or closing said. In particular, the present invention relates to a system for recirculating washing liquid in the rotating drum.
- It is known that washing machines, and in particular washing machines and washer-dryers, include a support cabinet, on which a washing tub is mounted, inside which rotates a drum, wherein the garments to be washed are placed. The tub has an opening through which the access to the drum is possible and clothes can be placed inside the drum. Such machines also comprise a controlled hydraulic system, which provides the water supply, suitably mixed with detergent substances, so that the garments are subjected to the washing process. It is also provided a recirculation circuit, which has the aim to facilitate the dissolution of the detergent in the water and to promote the circulation of water and detergent into the tub.
-
Public document EP 2 392 720 discloses a washing machine tub arrangement comprising: a tub having an inner surface and an outer surface, a pump housing for receiving a recirculation pump, wherein the pump housing comprises a pumping cavity, and a recirculation conduit connecting the pumping cavity of the pump housing to at least one nozzle for supplying washing liquid into the tub. The nozzle directs the flow of recirculated washing liquid in an axial direction from the side wall of the tub towards an outer side wall of the drum. In the side wall of the drum, corresponding circumferentially distributed holes are formed such that during the rotation of the drum the recirculated washing liquid can intermittently enter into the interior of the washing drum. - The Applicant observed that known horizontal axis washing machines suffer from some drawbacks related to the recirculation of the washing liquid.
- In fact, the washing machine described in the above cited document is characterized by the fact that most of the washing liquid sprayed against the drum does not enter said drum and does not facilitate the dissolution of the detergent in the water and does not promote any circulation of water and detergent into the tub. Indeed,
EP 2 392 720 - It should be noted that this implies a not effective and not efficient circulation and/or a waste of the energy used for moving the pump of the recirculation conduit.
- It is the main object of the present invention to overcome the above-mentioned drawbacks by providing an efficient recirculation system for horizontal axis washing machines in order to improve the washing performances.
- Another object of the present invention is to provide a recirculation system having a simple and reliable structure.
- Another object of the present invention is to provide a horizontal axis washing machine provided with such efficient, simple and reliable recirculation system.
- The Applicant has found that such objectives can be obtained by providing a sprayer that includes nozzles positioned according to a predetermined pattern, wherein these nozzles work in combination with corresponding apertures/through passages obtained in the drum so that, during the rotation of the drum, there is always at least one sprayer's nozzle aligned with the corresponding drum's aperture.
- More specifically, according to one aspect, the present invention relates to a horizontal drum washing machine with washing liquid recirculation system, comprising: a cabinet; a tub installed in the cabinet; a sump placed or fashioned at a bottom of the tub and configured to receive washing liquid; a drum rotatably mounted within said cabinet about a horizontal axis; a recirculating system in fluid communication with the sump and comprising at least a sprayer facing a wall of the drum; wherein the sprayer comprises a plurality of nozzles facing the wall of the drum and said wall presents a plurality of through passages; wherein the nozzles and the through passages are disposed and configured such that, during the rotation of the drum, there is always at least one nozzle aligned with at least a corresponding through passage in the drum.
- According to another aspect, the present invention relates to a method for recirculating washing liquid in a horizontal drum washing machine, preferably made according to the previous aspect, comprising: providing a drum rotatably mounted about a horizontal axis within a cabinet of the horizontal drum washing machine; providing a recirculating system in fluid communication with a sump and comprising at least a sprayer facing a wall of the drum; keeping always at least one sprayer's nozzle aligned with a corresponding drum's through passage during the rotation of the drum.
- The term "substantially horizontal" means that the axis is parallel to a horizontal plane or inclined of few degrees (0° - 20°) with respect to said horizontal plane. "Nozzle aligned with at least a corresponding through passage" means that the through passage is placed on a direction of the flow ejected by the nozzle so that the ejected flow crosses the through passage and enters the drum with no obstacles.
- The Applicant verified that in such a way, the washing liquid is sprayed into the drum throughout the entire rotation of the drum, so allowing an improvement of the washing performances.
- The Applicant also verified that the invention is structurally simple and reliable, since the sprayer may be motionless and hence said sprayer may be easy connected to the rest of the recirculation system.
- The present invention, in at least one of the aforesaid aspects, can have one or more of the preferred characteristics that are described hereinbelow.
- Preferably, the horizontal drum washing machine is a top-loading washer. Preferably, the drum is perforated and these perforation are preferably other than the through passages.
- Preferably, the recirculation system comprises a pump placed on a recirculation conduit which is connected to the sprayer and to the sump.
- Preferably, the sprayer is motionless.
- Preferably, the sprayer is fixed to the tub.
- Preferably, the through passages are elongated slots.
- Preferably, the nozzles are substantially circular and/or shaped like dots. The nozzles eject jets of washing liquid into the slots as the drum and the slots moves. Preferably, the wall of the drum comprises a cylindrical wrapper and at least an end wall closing at least one end of the cylindrical wrapper. Preferably, in a top-loading washer, another end wall closes the other end of the cylindrical wrapper. Preferably, the sprayer faces one of the end walls (front or rear end walls). Preferably, said through passages are fashioned in one of the end walls. Preferably, the sprayer is mounted on the rear of the tub. Preferably, the sprayer is coaxial to the drum.
- In a different embodiment, said through passages are fashioned in the cylindrical wrapper and the sprayer faces the cylindrical wrapper.
- Preferably, the plurality of through passages are arranged along circular paths coaxially disposed with respect to the horizontal axis.
- Preferably, the through passages are arc shaped.
- Preferably, the plurality of through passages comprises groups of through passages.
- Preferably, the through passages of each group are positioned along a respective circular path.
- Preferably, the circular paths are coaxially disposed with respect to the horizontal axis and concentric relative to each other.
- Preferably, the through passages of all groups form radial arrays of through passages, wherein each array comprises a through passage of each group. Preferably, the through passages of each group are angularly equidistant relative to one another.
- Preferably, the through passages are positioned such that the center of mass of the end wall is placed substantially at the horizontal axis in order to assure the balance of the drum about the axis during rotation.
- Preferably, the plurality of nozzles are each arranged along circular paths coaxially disposed with respect to the horizontal axis.
- Preferably, the nozzles are angularly offset one with respect to the other such that always during the rotation of the drum at least one nozzle is aligned with at least a corresponding through passage in the drum.
- Preferably, the plurality of nozzles comprises groups of nozzles, wherein the nozzles of each group are positioned along a respective circular path facing a respective circular path of the through passages.
- Preferably, the nozzles of each group are positioned along a respective circular path.
- Preferably, the nozzles are coaxially disposed with respect to the horizontal axis and concentric relative to each other.
- Preferably, the nozzles of each group are angularly offset with respect to the nozzles of another group.
- Preferably, the nozzles of each group are angularly equidistant relative to one another.
- Preferably, always during the rotation of the drum, the nozzles of at least one group of nozzles are aligned with the corresponding through passages of at least one group of through passages.
- Preferably, the number of groups of nozzles is equal to the number of groups of through passages.
- Preferably, the number of nozzles per group is equal to the number of groups. Preferably, the number of through passages per group is equal to the number of groups. Preferably, the number of arrays of through passages is equal to the number of groups.
- Preferably, each through passage extends over a first angle, preferably given by the following formula: α1 = 180°/number of groups.
- Preferably, the through passages of each group are angularly spaced of a second angle α2, preferably substantially equal to the first angle α1.
- Preferably, the nozzles of each group are angularly spaced of a third angle α3, preferably given by the following formula: α3 = 2 x α1.
- Preferably, corresponding or homologous nozzles belonging to different groups are angularly spaced of a fourth angle α4, preferably given by the following formula: α4 = α1 / (number of groups - 1). The corresponding or homologous nozzles belonging to different groups are the nozzles which, in a predetermined angular position of the drum, are all aligned with the same radial array of through passages. In other words, the corresponding or homologous nozzles belonging to different groups are arranged in radial curved arrays of nozzles.
- Preferably, corresponding or homologous nozzles belonging to different groups span over a fifth angle α5 preferably equal to α1.
- Preferably, the fifth angle α5 is equal to or greater than the first angle α1.
- Preferably, the number of groups of nozzles and the number of groups of through passages is of three, the number of nozzles per group and the number of through passages per group is of three, the first angle α1 and the second angle α2 are 60°, the third angle α3 is 120°, the fourth angle α4 is 30°, the fifth angle α5 is 60°.
- Further objects, features and advantages of the present invention will become apparent from the following detailed description and from the annexed drawings, which are supplied by way of non-limiting example, wherein:
-
Fig. 1 is a schematic side view of a horizontal drum washing machine according to the invention; -
Fig. 2 is a schematic rear view of the horizontal drum washing machine offigure 1 ; -
Fig. 3 is an enlarged view of rear wall of the drum of the machine offigures 1 and 2 ; -
Fig. 4 is an enlarged front view of a sprayer of the machine offigures 1 and 2 ; -
Figures 5A to 5D shows schematically respective angular positions of the rotating drum with respect to the sprayer; -
Fig. 6 is a chart representing the relative positions of nozzles of the sprayer with respect to slots of the drum. - Referring now to the annexed drawings, in
Fig. 1 reference numeral 1 designates a top loading horizontal drum washing machine, according to the present invention. - A
perforated drum 2 of themachine 1 comprises a stainless steel cylindrical wrapper 3 provided with a rectangular drum aperture provided with adoor 4. Thedrum 2 is rotating within a plastic tub T mounted, with the interposition of known dampers, within a cabinet C. Such cabinet C is provided with a lid L for closing the access opening towards thedrum 2. - The tub T is fixed to the cabinet C and the
drum 2 is mounted within said cabinet C and within the tub T to rotate about a horizontal axis X-X. - A bottom of the tub T delimits a
sump 5 configured to receive the washing liquid. Arecirculating system 6 is in fluid communication with thesump 5 and it is configured to recirculate the washing liquid between thesump 5 and therotating drum 4. - The
machine 1 is provided with other elements which are commonly known and not described in the present description. - The
recirculating system 6 comprises arecirculation duct 7 having a first end in fluid communication with thesump 5 and a second end connected to asprayer 8. Apump 9 is placed on therecirculation conduit 7 to pump the washing fluid form thesump 5 towards thesprayer 8. Thesprayer 8 and preferably also therecirculation conduit 7 are installed and supported by the tub T or by the cabinet C and are motionless with respect to said tub T and cabinet C. - The
drum 2 comprises acylindrical wrapper 11, afront wall 12 and arear wall 13 closing the ends of thecylindrical wrapper 11. - The
sprayer 8 has a substantially cylindrical shape coaxial to thedrum 2 and provided with afront face 14 facing the rear wall of thedrum 2. - As shown in
figure 4 , thefront face 14 of thesprayer 8 is provided with a plurality of nozzles in fluid communication with therecirculation conduit 7 and facing therear wall 13 of thedrum 2. The plurality of nozzles comprises three groups of nozzles. Each group of nozzles comprises three nozzles arranged along a respective circular path coaxially disposed with respect to the horizontal axis X-X. A first group ofnozzles 15 is arranged along a first inner circular path, a second group ofnozzles 16 is arranged along a second middle circular path, a third group ofnozzles 17 is arranged along a third outer circular path. Thenozzles nozzles nozzles - As shown in
figure 3 , the rear wall of thedrum 2 is provided with a plurality of throughpassages drum 2. - Each group of through passages comprises three through passages arranged along a respective circular path coaxially disposed with respect to the horizontal axis X-X. A first group of through
passages 18 is arranged along a first inner circular path, a second group of throughpassages 19 is arranged along a second middle circular path, a third group of throughpassages 20 is arranged along a third outer circular path. - The first circular path of
nozzles passages nozzles passages nozzles passages passage passages passages - Each through
passage figure 3 , the three radial arrays span over the first angle α1 and are spaced one from the other of the second angle α2. The throughpassages rear wall 13 is placed substantially at the horizontal axis X-X in order to assure the balance of thedrum 2 about the axis during rotation. - As shown in
figure 4 , thenozzles nozzles nozzles nozzles nozzles - The
nozzles slots drum 2 and the slots moves. - The
nozzles passages drum 2, at least three nozzles are always aligned with corresponding three throughpassages nozzles passages drum 2. -
Figures 5A - 5D show respective positions of the throughpassages rotating drum 2 with respect to thenozzles sprayer 8 during a rotation of thedrum 2 of about 90°. - In
figure 5A (taken as position 0°), all thenozzles passages drum 2. The array A1 is the uppermost one.Figure 5B shows thedrum 2 and the throughpassages figure 5A . Thenozzles 15 of the inner group are no more aligned with the respective through passages while thenozzles nozzles drum 2. -
Figure 5C shows thedrum 2 and the throughpassages figure 5A . Thenozzles 16 of the middle group are no more aligned with the respective through passages while thenozzles nozzles drum 2. -
Figure 5D thedrum 2 and the throughpassages figure 5A . Thenozzles 17 of the outer group are no more aligned with the respective through passages while thenozzles nozzles drum 2. - A further rotation of 30° (120° with respect to
figure 5A ) gives rise to the same configuration shown infigure 5A , wherein the array A3 is the uppermost one. - The chart of
figure 6 shows the above described positions and the transitions between said positions. Dots and lines on the chart represent the alignment of thenozzles passages - Between 0° and 30°, only the
nozzles nozzles 17 of the outer group are aligned. Between 60° and 90°, only thenozzles 15 of the inner group are aligned. Between 90° and 120°, only thenozzles drum 2 throughout the entire rotation of thedrum 2. - The top-loading washing machine with recirculation system described herein by way of example may be subject to many possible variations without departing from the novelty spirit of the inventive idea.
- For instance, the through passages may be fashioned in the
cylindrical wrapper 11 and the sprayer may face thecylindrical wrapper 11. - It is also clear that in the practical implementation of the invention the illustrated details may have different shapes or be replaced with other technically equivalent elements.
- It can therefore be easily understood that the present invention is not limited to the above-described top-loading washing machine but may be subject to many modifications, improvements or replacements of equivalent parts and elements without departing from the inventive idea, as clearly specified in the following claims.
Claims (15)
- A horizontal drum washing machine with washing liquid recirculation system, comprising:a cabinet (C);a tub (T) installed in the cabinet (C);a sump (5) placed or fashioned at a bottom of the tub (T) and configured to receive washing liquid;a drum (2) rotatably mounted within said cabinet (C) about a horizontal axis (X-X);a recirculating system (6) in fluid communication with the sump (5) and comprising at least a sprayer (8) facing a wall (13) of the drum (2);wherein the sprayer (8) comprises a plurality of nozzles (15, 16, 17) facing the wall (13) of the drum (2) and said wall (13) presents a plurality of through passages (18, 19, 20); wherein the nozzles (15, 16, 17) and the through passages (18, 19, 20) are disposed and configured such that, during the rotation of the drum (2), there is always at least one nozzle (15, 16, 17) aligned with at least a corresponding through passage (18, 19, 20) in the drum (2).
- The machine of claim 1, wherein the through passages (18, 19, 20) are elongated slots and the nozzles (15, 16, 18) are substantially circular and/or shaped like dots.
- The machine of claim 1 or 2, wherein the wall (11, 12, 13) of the drum (2) comprises a cylindrical wrapper (11) and at least an end wall (12, 13) closing at least one end of the cylindrical wrapper (11); wherein the sprayer (8) faces the end wall (13).
- The machine of claim 3, wherein the through passages (18, 19, 20) and the nozzles (15, 16, 17) are arranged along respective circular paths coaxially disposed with respect to the horizontal axis (X-X).
- The machine of claim 4, wherein the through passages (18, 19, 20) are arc shaped.
- The machine of claim 4 or 5, wherein each through passage (18, 19, 20) extends over a first angle, preferably given by the following formula: α1 = 180°/number of groups.
- The machine of any of claims 4 to 6, wherein the plurality of through passages (18, 19, 20) comprises groups of through passages, wherein the through passages (18, 19, 20) of each group are positioned along a respective circular path.
- The machine of claim 7, wherein the through passages (18, 19, 20) of all groups form radial arrays (A1, A2, A3) of through passages, wherein each array (A1, A2, A3) comprises a through passage of each group.
- The machine of claim 7 or 8, wherein the through passages (18, 19, 20) of each group are angularly equidistant relative to one another.
- The machine of any of claims 7 to 9, wherein the nozzles (15, 16, 17) are angularly offset one with respect to the other.
- The machine of any of claims 7 to 10, wherein the plurality of nozzles (15, 16, 17) comprises groups of nozzles, wherein the nozzles (15, 16, 17) of each group are positioned along a respective circular path facing a respective circular path of the through passages (18, 19, 20).
- The machine of claim 11, wherein the nozzles (15, 16, 17) of each group are angularly offset with respect to the nozzles (15, 16, 17) of another group.
- The machine of claim 11 or 12, wherein the nozzles (15, 16, 17) of each group are angularly equidistant relative to one another.
- The machine of any of claims 11 to 13, wherein, during the rotation of the drum (2), there are always the nozzles (15, 16, 17) of at least one group of nozzles aligned with the corresponding through passages (18, 19, 20) of at least one group of through passages.
- The machine of any of claims 1 to 14, wherein the sprayer (8) is motionless and it is preferably fixed to the tub (T).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP16193972.3A EP3309290B1 (en) | 2016-10-14 | 2016-10-14 | Horizontal drum washing machine with washing liquid recirculation system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP16193972.3A EP3309290B1 (en) | 2016-10-14 | 2016-10-14 | Horizontal drum washing machine with washing liquid recirculation system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3309290A1 true EP3309290A1 (en) | 2018-04-18 |
EP3309290B1 EP3309290B1 (en) | 2019-03-20 |
Family
ID=57136781
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16193972.3A Active EP3309290B1 (en) | 2016-10-14 | 2016-10-14 | Horizontal drum washing machine with washing liquid recirculation system |
Country Status (1)
Country | Link |
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EP (1) | EP3309290B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4067552A1 (en) * | 2021-04-02 | 2022-10-05 | Whirlpool Corporation | Washing drum unit with a jet spray |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2392720A1 (en) | 2010-06-04 | 2011-12-07 | Electrolux Home Products Corporation N.V. | Washing water recirculation tub arrangement |
WO2014037840A1 (en) * | 2012-09-06 | 2014-03-13 | BSH Bosch und Siemens Hausgeräte GmbH | Annular portal assembly for a front-loading washing machine with a laundry soaking system and washing machine comprising the assembly |
EP2719814A1 (en) * | 2012-10-09 | 2014-04-16 | Candy S.p.A. | Laundry washing machine with enhanced detergent activation |
-
2016
- 2016-10-14 EP EP16193972.3A patent/EP3309290B1/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2392720A1 (en) | 2010-06-04 | 2011-12-07 | Electrolux Home Products Corporation N.V. | Washing water recirculation tub arrangement |
WO2014037840A1 (en) * | 2012-09-06 | 2014-03-13 | BSH Bosch und Siemens Hausgeräte GmbH | Annular portal assembly for a front-loading washing machine with a laundry soaking system and washing machine comprising the assembly |
EP2719814A1 (en) * | 2012-10-09 | 2014-04-16 | Candy S.p.A. | Laundry washing machine with enhanced detergent activation |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4067552A1 (en) * | 2021-04-02 | 2022-10-05 | Whirlpool Corporation | Washing drum unit with a jet spray |
US11608583B2 (en) | 2021-04-02 | 2023-03-21 | Whirlpool Corporation | Washing drum unit with a jet spray |
Also Published As
Publication number | Publication date |
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EP3309290B1 (en) | 2019-03-20 |
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