EP4215666A1 - Laundry treating machine including a condenser having an injection device - Google Patents

Laundry treating machine including a condenser having an injection device Download PDF

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Publication number
EP4215666A1
EP4215666A1 EP23150915.9A EP23150915A EP4215666A1 EP 4215666 A1 EP4215666 A1 EP 4215666A1 EP 23150915 A EP23150915 A EP 23150915A EP 4215666 A1 EP4215666 A1 EP 4215666A1
Authority
EP
European Patent Office
Prior art keywords
liquid
condenser
laundry
tub
air flow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23150915.9A
Other languages
German (de)
English (en)
French (fr)
Inventor
Joaquin Jesus Capablo Sese
Ciro Sebastián VEREDA ORTIZ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BSH Hausgeraete GmbH
Original Assignee
BSH Hausgeraete GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BSH Hausgeraete GmbH filed Critical BSH Hausgeraete GmbH
Publication of EP4215666A1 publication Critical patent/EP4215666A1/en
Pending legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F25/00—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement, the receptacle serving both for washing and for centrifugally separating water from the laundry and having further drying means, e.g. using hot air 
    • 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
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/24—Condensing 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
    • D06F37/26—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
    • D06F39/088—Liquid supply 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
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/206—Heat pump 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
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/22—Lint collecting arrangements

Definitions

  • the invention relates to a laundry treating machine having a tub including an inside for receiving laundry to be treated, said tub including an essentially cylindrical shell and a circular back wall closing said shell at an end thereof, and an air guiding circuit for guiding an air flow through said tub, said air guiding circuit including a condenser having an injection device for injecting a liquid into the air flow for condensing humidity from the air flow.
  • Document WO 2011/113803 A1 discloses a laundry treating machine embodied as a washer/dryer for washing and drying laundry, the laundry treating machine also including a condenser for condensing humidity from a hot and humid air flow by spraying water into the air flow through an injection device.
  • the condenser is placed separate from the tub.
  • the injection device includes a spray head rotatable by water sprayed out of nozzles provided at the spray head for distributing spray water evenly into the condenser and having inner surfaces of the condenser rinsed thoroughly.
  • Any known laundry treatment machine including a drying function for laundry generally includes an air guiding circuit with components for heating or de-humidifying an air flow applied for treating the laundry placed outside the tub and connected to the tub's inside by suitable air guides such as tubes and connectors.
  • This requires considerable space for placing the air guiding circuit which may incur problems if the tub is suspended movably within the laundry treatment machine by limiting any possible swing of the tub or limiting the dimensions of the tub for meeting a pertinent standard of outer size of such laundry treatment machine.
  • liquid like freshwater for de-humidifying an air flow in a laundry treatment machine is determined by an efficiency of interaction between the humid air flow and the water added on purpose of cooling and provoking condensation of humidity from the air flow. If efficiency is low, the amount of water to be applied for proper condensation is high.
  • an air flow emerging from laundry being dried usually includes dispersed particulate matter extracted from the laundry and conventionally termed lint which needs to be extracted from the air flow to prevent it from being deposited uncontrollably within the air guiding circuit.
  • lint which needs to be extracted from the air flow to prevent it from being deposited uncontrollably within the air guiding circuit.
  • extraction may be accomplished by a lint filter suitably designed and placed in the air guiding circuit, as commonly practiced in laundry dryers.
  • the liquid may also be applied for extracting lint from the air flow.
  • Appropriate effectivity of extracting lint however requires provision of an intimate contact between the liquid and the air flow.
  • the present invention provides a laundry treating machine of the generic type as defined in the generic part of the independent claim attached which also includes the features of the characterizing part of said independent claim.
  • a laundry treating machine having a tub including an inside for receiving laundry to be treated, said tub including an essentially cylindrical shell and a circular back wall closing said shell at an end thereof, and an air guiding circuit for guiding an air flow through said tub, said air guiding circuit including a condenser having an injection device for injecting a liquid into the air flow for condensing humidity from the air flow.
  • Said condenser is shaped as a segment of an annulus and placed on said back wall in said tub, said injection device includes a pipe section for guiding the liquid to be sprayed and extending along said back wall, said pipe section having a multiplicity of nozzles for spraying the liquid into said condenser, and said condenser includes a first opening for guiding the air flow from said inside into said condenser and a second opening for guiding said air flow out of said condenser and out of said tub.
  • the condenser is placed inside the tub instead of outside the tub.
  • the invention reduces the requirement of space outside the tub for the condenser.
  • the condenser is shaped as an annular segment which is of rather flat shape and is properly fitted to the back wall and is provided with an injection device including a pipe section extending along the back wall and having a multiplicity of nozzles for dispensing the liquid, thereby enabling an intimate contact between the liquid and the air flow for properly fulfilling the functions of condensing humidity and extracting lint. De-humidification of the air flow thus improved considerable reduction of energy consumption within a complete drying cycle may result.
  • the improved design of the condenser may yield advantages in manufacturing the laundry treatment machine will also be attained. Even further, the laundry treatment machine of the invention properly lends itself to integration of a heat pump for heating and cooling purposes, thereby further reducing energy consumption in a drying process.
  • a heat transfer rate in condensation may be obtained in the condenser of the laundry treatment machine according to the invention increased by 30% as compared to a laundry treatment machine wherein just one nozzle is applied for spraying the liquid into the condenser.
  • the rate of condensation itself may be obtained in the condenser of the laundry treatment machine according to the invention increased by 50 % as compared to a laundry treatment machine wherein just one nozzle is applied for spraying the liquid into the condenser.
  • the nozzles to be provided in accordance with the invention may be formed by any suitable means.
  • Dedicated nozzles as commercially available may be installed on the pipe section, or the pipe section may be provided with suitable outlets such as holes or slits drilled into the pipe section or cut out from the pipe section.
  • Sizes and number of nozzles may be adjusted in consideration of a flow rate of liquid, which may be set to about 2 l/min in the case of using freshwater from a public supply net at a temperature between 16 °C and 22 °C, or even less, with a flow rate of the air flow being about 100 m 3 /h at normal ambient pressure, at a temperature of about 60 °C and a relative humidity of about 80%. In such case three nozzles may be appropriate. In cases where a higher amount of liquid flow rate such as 4 l/min or even 7 l/min is set, it may be appropriate to provide more than three nozzles such as eight nozzles.
  • the invention may be applied to any laundry treatment machine.
  • the laundry treatment machine may be a laundry dryer or a washer-dryer, all possibly equipped with a heat pump for drying, cooling, or heating purposes.
  • the condenser is formed by a bulge directed outwardly from the tub and formed in the back wall and a cover fixed to the back wall for covering the bulge.
  • the first opening is formed as a slit between the cover and the back wall, and the second opening is formed in the bulge.
  • the multiplicity of nozzles is three nozzles.
  • the injection device is included in an open liquid guiding system including an inlet for connecting to a public freshwater supply net and an outlet for connecting to a public wastewater dump.
  • the invention is applied to a laundry treatment machine which is operated with freshwater from a public supply for de-humidifying an air flow applied for drying laundry, such as a conventional washer/dryer.
  • the injection device is included in a closed liquid guiding system including a reservoir such as a tank for storing liquid collected from the condenser, a liquid pump for forwarding liquid from the reservoir to the injection device, and a liquid cooler for cooling liquid prior to reaching the injection device.
  • a reservoir such as a tank for storing liquid collected from the condenser
  • a liquid pump for forwarding liquid from the reservoir to the injection device
  • a liquid cooler for cooling liquid prior to reaching the injection device.
  • the invention is applied to a laundry treatment machine wherein liquid, particularly water, is guided within a fully or partly closed cycle for condensing humidity from an air flow by direct contact, an application wherein liquid thus applied and increased in volume by water obtained by condensation may be saved for use in a subsequent laundry treatment process such as washing by recycling.
  • the liquid cooler is included in a heat pump for absorbing heat.
  • the air guiding circuit includes an air heater for heating the air flow prior to entering the tub, the air heater included in the heat pump for releasing heat.
  • the invention is applied in a laundry treatment machine which includes a heat pump for recovering heat obtained in condensing humidity and eventually returning such heat into a treatment process by heating the air flow used for extracting heat from laundry being treated.
  • a heat pump applying a circulating and cyclically evaporated and condensed refrigerant in the inverse Rankine process
  • a liquid-to-refrigerant heat exchanger is applied as the liquid cooler which my result is improved effectivity of heat transfer.
  • a door is provided for sealing the inside against leaking of liquid and air during treatment of laundry.
  • the air guiding circuit includes a third opening for guiding the air flow into said inside, the third opening placed at the door. Thereby, the air flow may be brought into intimate contact with laundry to be dried and being tumbled in the rotating drum, and effectivity of absorbing humidity from the laundry increased.
  • Fig. 1 shows a laundry treating machine 1 embodied as a washing and drying machine or washer/dryer for treating laundry 2 by washing and drying.
  • Laundry treating machine 1 includes a housing 3 wherein a tub 4 is disposed.
  • Tub 4 includes an inside 5 for receiving laundry 2 to be treated and is swingingly suspended in housing 3 by springs and dampers not shown for clarity, allowing tub 4 to move in response to forces created by tumbling laundry 2 during treatment.
  • Tub 4 includes an essentially cylindrical shell 6 and a circular back wall 7 closing said shell 6 at an end thereof.
  • Tub 4 further includes an annular front wall 8 opposite to back wall 7.
  • a gasket 9 connects tub 4 to housing 3, and door 10 is provided for closing inside 5 during treatment of laundry 2, and for sealing inside 5 against leaking of liquid and air.
  • An air guiding circuit 11 is provided in housing 3 for guiding an air flow through tub 4, air guiding circuit 11 including a condenser 12 having an injection device 13 for injecting a liquid into the air flow for condensing humidity from the air flow.
  • Condenser 12 is shaped as a segment of an annulus as further detailed with reference to Figs. 2 to 4 below and placed on back wall 7 in tub 4.
  • injection device 13 includes a pipe section 14 for guiding liquid to be sprayed and extending along back wall 7.
  • Pipe section 14 has a multiplicity of nozzles 15 indicated in Fig. 1 by three strains of droplets emerging from nozzles 15 for spraying the liquid into condenser 12.
  • Condenser 12 includes a first opening 16 for guiding the air flow from inside 5 into said condenser 12 and a second opening 17 for guiding said air flow out of condenser 12 and out of tub 4.
  • condenser 12 is formed by a bulge 21 provided in back wall 7 and directed outwardly from tub 4.
  • a cover 22 is fixed to back wall 7 for covering bulge 21 to form condenser 12, leaving first opening 16 and second opening 17 for the air flow to pass through.
  • First opening 16 is formed as a slit between cover 22 and back wall 7 and said second opening 17 is formed in bulge 21.
  • the shape of condenser 12 is flat and annular-shaped and integrated into the structure forming back wall 7. Condenser 12 thus requires only a small amount of mounting space, whereby it may be avoided to extend the structure of tub 4 to limit its overall size or limit its movement within housing 3 upon tumbling laundry 2 during treatment.
  • the multiplicity of nozzles 15 is three nozzles 15.
  • Nozzles 15 may be formed by any suitable means. Dedicated nozzles 15 as commercially available may be installed on pipe section 14, or pipe section 14 may be provided with drilled or cut out outlets such as holes or slits. Sizes and number of nozzles 15 may be adjusted in consideration of a flow rate of liquid, which may be set to about 2 l/min in the case of using freshwater from a public supply net at a temperature between 16 °C and 22 °C, or even less, with a flow rate of the air flow being about 100 m 3 /h at normal ambient pressure, at a temperature of about 60 °C and a relative humidity of about 80%. In such case three nozzles 15 appear to be appropriate. In cases requiring a higher amount of liquid flow rate to be sprayed through nozzles 15 such as 4 l/min or even 7 l/min, it may be appropriate to provide more than three nozzles 15 such as eight nozzles 15.
  • a flow rate of liquid which may be set to about 2 l/min in the case of using
  • injection device 13 is included in an open liquid guiding system 23 including an inlet 24 for connecting to a public freshwater supply net and an outlet 26 for connecting to a public wastewater dump.
  • Open liquid guiding system 23 further includes a first valve 25 controllable by a control unit of laundry treating machine 1 not shown for clarity, first valve 25 allowing control of flow of freshwater to condenser 12.
  • the freshwater will serve as the liquid means for condensing humidity from the air flow entering from inside 5 through the first opening 16 and leave condenser 12 through first opening 16 to flow into inside 5 together with condensate formed in the air flow and collect in sump 27 disposed at the lowest part of tub 4. From sump 27, a suds pump 28 serves controlled by said control unit to forward the liquid to outlet 26.
  • Inlet 24 also serves to obtain freshwater from the public freshwater supply for washing laundry 2 under control of a second valve 29, which allows freshwater to enter mixing device 30 for being mixed with laundry treating agent such as washing preparation, rinsing preparation, bleach, and softener, and forming suds to be entered into tub 4 for use.
  • outlet 26 and suds pump 28 may serve for extracting suds from tub 4 after use and disposal in the public wastewater dump.
  • Figs. 2, 3, and 4 show tub 4 and condenser 12 formed therein in more detail. All figures exhibit a back section of a tub comprising a part, specifically a half, of shell 6 and back wall 7, as formed by injection moulding of a suitable plastic material. A bulge 21 is formed in back wall 7 as a recess projecting out of tub 4, as best seen in Fig. 2 . Bulge 21 is covered by cover 21 formed as a segment of an annulus, where the inner limitation of the annulus is required to allow a drum shaft to penetrate a bearing disposed in back wall 7. Thereby, condenser 12 is formed as a flat annular segment between bulge 21 and cover 22 such as in Fig. 3. Fig.
  • FIG. 4 shows the disposition of injection device 13 with pipe section 14 disposed within condenser 12, aligned along back wall 7, having three nozzles 15 for evenly distributing liquid provided by injection device 13, and having first opening 16. Droplets or small streams of liquid formed by nozzles 15 may fall downwards through condenser 12, thereby providing intimate contact to the air flow traversing condenser 12 in counterflow and effectively provoking condensation of humidity from the air flow.
  • liquid stored in tank 35 is used for absorbing heat extracted from liquid passing liquid cooler 37 by being heated. Possibly, not all liquid accumulated in tank 35 during a drying process for a batch of laundry 2 may be needed for providing the condensing effect in condenser 12.
  • Tank 35 may serve as a reservoir for liquid to be used in a subsequent laundry treatment process involving treatment of laundry 2 by washing or rinsing.
  • Heat pump 38 provides for heating liquid stored in tank 35, thereby allowing to apply such subsequent treatment with liquid pre-heated by heat pump 38, thus saving energy for heating during subsequent treatment. Further, use of freshwater for condensing humidity is avoided.
  • Fig. 6 exhibits a second alternative to the open liquid guiding system 23 as shown in Fig. 1 .
  • injection device 13 is also included in a closed liquid guiding system 34 including sump 27 for storing liquid collected from condenser 12, a liquid pump 36 for forwarding liquid from sump 27 to injection device 13, and a liquid cooler 37 for cooling liquid prior to reaching said injection device 13.
  • a lint filter that may be appropriate to have between sump 27 and injection device 13, to strain liquid to be forwarded to injection device 13 from lint which is particulate matter extracted from laundry 2 being dried by the air flow to be de-humidified in condenser 12.
  • Heat pump 38 is configured for pumping heat absorbed from liquid to be forwarded to injection device 13 in liquid cooler 37 to air heater 19 which is applied for heating the air flow which is applied for drying.
  • This air flow first enters condenser 12 through first opening 16 to be de-humidified, then passes to air heater 19 through second opening 17 and re-enters tub 4 for absorbing more humidity from laundry to be dried through third opening 20. If the heating power of air heater 19 is insufficient for efficiently drying laundry, air heater 19 may be supplemented by another heater which may also belong to heat pump 38. In this alternative, use of freshwater for condensation is also avoided, and heat absorbed from liquid to be used in condenser 12 is applied for heating the air flow, and thereby recycled in the drying process itself.
  • the evaporated refrigerant flows to compressor 40 to be compressed, and subsequently reaches Tank 35 or air heater 19 to be condensed, thereby releasing heat to the liquid in tank 35 or to the air flow to be forwarded to tub 4 for absorbing humidity from laundry 2.
  • the liquid refrigerant reaches restrictor 41 which may be embodied as an orifice, a valve, or a capillary, to reduce its internal pressure and temperature, and finally flows back to liquid cooler 37 to complete the circuit.
  • restrictor 41 may be embodied as an orifice, a valve, or a capillary, to reduce its internal pressure and temperature, and finally flows back to liquid cooler 37 to complete the circuit.
  • Application of heat pump 38 greatly improves utilization of energy for drying laundry 2 by recirculating heat energy though the heat pumping effect.
  • the invention reduces requirements of space outside tub 4 for condenser 12. An intimate contact between the liquid and the air flow for properly fulfilling the functions of condensing humidity and extracting lint is enabled thereby. De-humidification of the air flow thus improved considerable reduction of energy consumption within a complete drying cycle may result.
  • the improved design of condenser 12 may yield advantages in manufacturing laundry treatment machine 1. Even further, laundry treatment machine 1 of the invention properly lends itself to integration of a heat pump 38 for heating and cooling purposes, thereby further reducing energy consumption in a drying process.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
EP23150915.9A 2022-01-24 2023-01-10 Laundry treating machine including a condenser having an injection device Pending EP4215666A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22382046 2022-01-24

Publications (1)

Publication Number Publication Date
EP4215666A1 true EP4215666A1 (en) 2023-07-26

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Application Number Title Priority Date Filing Date
EP23150915.9A Pending EP4215666A1 (en) 2022-01-24 2023-01-10 Laundry treating machine including a condenser having an injection device

Country Status (2)

Country Link
EP (1) EP4215666A1 (zh)
CN (1) CN116479632A (zh)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080071425A (ko) * 2007-01-30 2008-08-04 엘지전자 주식회사 세탁건조기
WO2011113803A1 (en) 2010-03-15 2011-09-22 BSH Bosch und Siemens Hausgeräte GmbH Laundry processing apparatus with drying procedure
EP3379992B1 (en) 2015-11-24 2019-11-06 BSH Hausgeräte GmbH Household appliance with a heat pump and method for operating a household appliance
WO2020088646A1 (zh) * 2018-11-02 2020-05-07 海信（山东）冰箱有限公司 一种洗衣机
KR20200081901A (ko) * 2018-12-28 2020-07-08 엘지전자 주식회사 의류처리장치

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080071425A (ko) * 2007-01-30 2008-08-04 엘지전자 주식회사 세탁건조기
WO2011113803A1 (en) 2010-03-15 2011-09-22 BSH Bosch und Siemens Hausgeräte GmbH Laundry processing apparatus with drying procedure
EP3379992B1 (en) 2015-11-24 2019-11-06 BSH Hausgeräte GmbH Household appliance with a heat pump and method for operating a household appliance
WO2020088646A1 (zh) * 2018-11-02 2020-05-07 海信（山东）冰箱有限公司 一种洗衣机
KR20200081901A (ko) * 2018-12-28 2020-07-08 엘지전자 주식회사 의류처리장치

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Publication number Publication date
CN116479632A (zh) 2023-07-25

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