EP3718459A1 - Lave-vaisselle, en particulier lave-vaisselle électroménager - Google Patents

Lave-vaisselle, en particulier lave-vaisselle électroménager Download PDF

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Publication number
EP3718459A1
EP3718459A1 EP20167646.7A EP20167646A EP3718459A1 EP 3718459 A1 EP3718459 A1 EP 3718459A1 EP 20167646 A EP20167646 A EP 20167646A EP 3718459 A1 EP3718459 A1 EP 3718459A1
Authority
EP
European Patent Office
Prior art keywords
air
evaporator
section
duct
dishwasher
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20167646.7A
Other languages
German (de)
English (en)
Other versions
EP3718459B1 (fr
Inventor
Benjamin STANKE
Ralph Steinmeier
André Kornfeld
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.)
Miele und Cie KG
Original Assignee
Miele und Cie KG
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 Miele und Cie KG filed Critical Miele und Cie KG
Publication of EP3718459A1 publication Critical patent/EP3718459A1/fr
Application granted granted Critical
Publication of EP3718459B1 publication Critical patent/EP3718459B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4291—Recovery arrangements, e.g. for the recovery of energy or water
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/48—Drying arrangements
    • A47L15/483—Drying arrangements by using condensers
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/48—Drying arrangements
    • A47L15/486—Blower arrangements

Definitions

  • the invention relates to a dishwasher, in particular a domestic dishwasher, with a heat pump device which has an evaporator arranged in an air duct, the air duct having an air inlet opening and an air outlet opening.
  • a dishwasher of the generic type is from EP 3 427 628 A1 known.
  • the ones from the EP 3 427 628 A1 previously known dishwasher has a washing container which provides a washing area. This is accessible on the user side via a loading opening, which can be closed in a fluid-tight manner by means of a pivotably mounted wash cabinet door.
  • the washing compartment serves to hold items to be cleaned, which can be, for example, dishes, cutlery and / or the like.
  • a spray device housed in the washing container serves to apply washing liquid to wash items to be cleaned.
  • This spray device typically provides rotatably mounted spray arms, two or three such spray arms being provided as a rule. When used as intended, the items to be cleaned are exposed to washing liquor by means of rotating spray arms
  • the previously known dishwasher also has a heat pump device which is used to reduce energy consumption, in particular when heating the washing liquor.
  • the heat pump device of the dishwasher after EP 3 427 628 A1 it is a so-called air-water heat pump device. When used as intended, heat energy is extracted from the ambient air with such a heat pump device.
  • the EP 3 427 628 A1 provides an air duct for this purpose, inside which an evaporator of the heat pump device is arranged. Furthermore, a fan wheel is arranged in the air duct, which, when used as intended, sucks in ambient air which is guided through the evaporator arranged in the air duct.
  • the air duct has a front air inlet opening and a rear air outlet opening so that ambient air sucked in at the front of the dishwasher can be directed back into the atmosphere surrounding the dishwasher after passing through the evaporator at the rear of the dishwasher.
  • the construction is based on the EP 3 427 628 A1 has basically proven its worth in everyday practical use, there is a need for improvement.
  • the aim is to minimize the assembly effort for setting up a dishwasher at the installation site. It is therefore the object of the invention to further develop a dishwasher of the type mentioned at the outset in such a way that simplified assembly at the installation site of the dishwasher is made possible.
  • the invention proposes a dishwasher of the type mentioned at the beginning, which is characterized in that the air inlet opening and the air outlet opening are formed at the front of the dishwasher and that the air duct has a first and a second duct section, the first duct section being the air inlet opening and the second duct section have the air outlet opening.
  • the air outlet opening is not formed on the rear of the dishwasher. Rather, it is provided that both the air inlet opening and the air outlet opening are formed on the front of the dishwasher. When used as intended, ambient air is sucked in at the front, and after flowing through the air duct, it is also drawn in at the front of the dishwasher via the air outlet opening provided for this purpose is discharged back into the atmosphere surrounding the dishwasher.
  • the air duct has two duct sections, namely a first duct section on the one hand and a second duct section on the other.
  • the first duct section has the air inlet opening. When used as intended, air is therefore introduced into the first duct section via the air inlet opening. After the air has been transferred from the first duct section into the second duct section, the air cooled down in the evaporator can then be discharged through the air outlet opening, with the cooled air being released from the front of the device depending on the front-side formation of the air outlet opening.
  • the embodiment according to the invention provides a remedy here, since both the air inlet and the air outlet are located on the front of the device, so that only a corresponding cutout needs to be made in the baseboard, for example the kitchen unit, to set up the device. Additional sealing measures for the room wall and / or for neighboring furniture and / or equipment are not required.
  • the air duct preferably protrudes beyond a front side of the skirting board and is in particular passed through a cutout in the skirting board, the air inlet opening filling a first area and the air outlet opening of a second of the cutout in the skirting board.
  • Another advantage of the embodiment according to the invention is that there is a constructional flow through the evaporator twice, namely a first flow when passing through the first channel section and a second flow when passing through the second channel section.
  • the air that is drawn in therefore flows through the air inlet opening into the first duct section and flows through the evaporator for the first time.
  • the air flows through the second duct section and passes the evaporator a second time.
  • This separation of the evaporator in two directions of flow the flow rate through the evaporator increases while the volume flow and the dimensions of the evaporator remain the same. This causes a better heat transfer from the air to the working medium or refrigerant of the evaporator, which increases the efficiency of the heat pump device.
  • the distance between the fins of the evaporator which is preferably designed as a lamellar heat exchanger, can be increased. This in turn allows a more cost-effective design of the evaporator and enables better removal of condensate that may occur on the fins by dripping off.
  • the front discharge of the air cooled in the evaporator has the disadvantage that there may be a certain short-circuit current with regard to the room air to be sucked in, but this disadvantage is consciously accepted because the advantages achieved with the invention outweigh.
  • an undesired short-circuit current can be reduced to a minimum by optimizing the air duct, the duct sections and / or other measures, as can the associated negative effect.
  • a structural design is created that allows optimized operation of the heat pump device, and this with the possibility of simplified assembly at the same time.
  • an increase in efficiency can be achieved.
  • the evaporator is arranged with a first evaporator section in the first duct section and with a second evaporator section in the second duct section.
  • the evaporator is therefore divided into two in terms of flow technology, with a first section of the evaporator being in operative connection with the air guided through the first duct section in the intended use. Instead, the second evaporator section interacts with the air passed through the second duct section.
  • the second channel section is fluidically connected to the first channel section, wherein the first duct section serves as a supply air duct for the first evaporator section or the first evaporator and the second duct section serves as an exhaust air duct for the second evaporator section or the second evaporator.
  • the air duct is therefore formed in two parts in the manner already described, one part serving as an inlet air duct and the other part as an exhaust air duct.
  • the sucked in ambient air flows in via the supply air duct. This happens through the first evaporator section. A deflection then takes place and the air is conveyed back to the outlet opening through the exhaust air duct. The air then passes through the second evaporator section.
  • the efficiency of the heat pump device is increased overall in the manner already described.
  • the air inlet opening and the air outlet opening are fluidically separated from one another.
  • the two duct sections are also preferably separated from one another in terms of flow, so that undesired mixing of supply air and exhaust air is avoided.
  • the fluidic separation can run vertically or horizontally. In the case of a vertical separation, the air inlet opening and the air outlet opening lie next to one another in the horizontal direction. It is preferred here to use the entire width of the dishwasher for forming the openings.
  • the air inlet opening and the air outlet opening are arranged one above the other in the vertical direction, it being preferred to position the air inlet opening above the air outlet opening.
  • the evaporator is preferred with a horizontal separation of the air duct formed tilted and / or the separating plane within the evaporator is aligned inclined to the horizontal, so that condensate that may occur can drain away.
  • the flow separation can also take place with a horizontal alignment of the lamellae by a lamella itself or by a separate plate. In the case of a separate plate, the fins of the heat exchanger can be oriented both vertically and horizontally.
  • a short-circuit current can also be reduced even further in that the opening areas of the air inlet opening and air outlet opening are designed to be of different sizes. And so it is preferred according to a further feature of the invention that the opening area provided by the air inlet opening is larger than the opening area provided by the air outlet opening, in particular by a factor between 1 and 3, preferably by a factor between 1.2 and 2 than the opening area provided by the air outlet port. This has the effect that the flow speed of the air discharged via the outlet opening is increased, with the result that the momentum is increased. As a result, the flow velocity of the air flowing in via the inlet opening decreases.
  • the exhaust air can flow out at an angle to the horizontal of, for example, between 0 ° and 20 °, even more preferably between 0 ° and 10 °, for example by having a plate separating the two duct sections from one another on the opening side corresponding to the Horizontal is inclined. A possible flow short circuit can thus be reduced even further.
  • the cold or working medium of the heat pump device goes through a phase change in the evaporator. It enters the evaporator as wet steam, where it evaporates and is then overheated. During overheating, the Temperature of the refrigerant, which reduces the temperature difference between the air as an energy source and the refrigerant. The heat flow, however, is strongly dependent on the temperature difference between the two media, which means that this decreases as the temperature difference becomes smaller.
  • the refrigerant flow can be designed specifically. The air that is sucked in is initially cooled down a little when it first passes through the heat exchanger, and when it passes through it again in the outlet direction, it is then cooled down further.
  • the overheating of the refrigerant can be placed in the flow area of the intake air.
  • This arrangement corresponds to a counterflow heat exchanger, which can transfer a larger amount of energy compared to a cocurrent heat exchanger.
  • the configuration according to the invention also proves to be advantageous in this respect.
  • waste heat from the base area of the dishwasher is lost to the environment.
  • This waste heat can be used by adding it to the air drawn in from the environment.
  • warm base air is supplied to the exhaust air flow, which improves the comfort of a user standing in front of the dishwasher.
  • the first and / or the second channel section are fluidically connected to the atmosphere surrounding the channel section by means of an inflow opening that can be closed in a fluid-tight manner.
  • the inflow opening is arranged in a region of a base of the dishwasher below the washing compartment.
  • a fan wheel preferably having a radial fan, is provided, which is arranged in the air duct and downstream of the first evaporator section or the first evaporator in terms of flow and upstream of the second evaporator section or the second evaporator in terms of flow direction. It is provided that in the flow direction between the first evaporator section or first evaporator and fan wheel, a fluid-tight closable passage opening is formed which fluidically connects the first channel section to the second channel section. This allows it to pass through the air duct otherwise reverse guided return air flow, so that a full-area flow through the heat exchanger can be achieved. This makes it possible to use the air passed through the air duct for active condensation drying. It is therefore also preferred to provide a second channel that is fluidically connected to the air channel and that allows air to be applied to a washing container wall when it is loaded.
  • any residual moisture in the heat exchanger can dry off better, for example through the formation of condensation.
  • the fan running time can be extended beyond the active condensation drying so that the heat exchanger is completely dried off.
  • a first part, in particular at least 60%, of the sucked air preferably a volume flow of at least 30m 3 / h, in particular between 35m 3 / h and 55m 3 / h, for condensation drying is used and that a preferably smaller, second part of the sucked in air is fed back through a bypass through the heat exchanger, so that evaporator drying is achieved and this with simultaneous fan support for active condensation drying.
  • the result of the embodiment according to the invention is, in particular, that the split air flow through the evaporator provides a heat pump device that is optimized in terms of installation space.
  • the installation during manufacture of the dishwasher is simplified by the one-sided air inlet and outlet. No further air ducts or seals are necessary within a kitchen unit, which makes assembly at the installation site less complex. All that is needed is a cutout in the baseboard of the kitchen unit and the air duct shortened to match the individual base recess.
  • Fig. 1 shows a dishwasher 1 according to the invention in a purely schematic sectional side view.
  • the dishwasher 1 is part of a kitchen unit which is arranged on a room wall 6.
  • a worktop 8 is provided above the dishwasher 1.
  • the dishwasher 1 has a housing 2 which, among other things, accommodates a washing container 3.
  • the washing compartment 3 for its part provides a washing area 4 which, when used as intended, serves to hold items 7 to be cleaned.
  • the washing container 3 For the user-side loading of the washing area 4 with items 7 to be washed, the washing container 3 has a loading opening (not shown in detail in the figures) which can be closed in a fluid-tight manner by means of a washing area door 5.
  • the dishwasher 1 also has a heat pump device 10.
  • This has, in a known manner, a compressor, a condenser, an expansion element in the form of a throttle, an evaporator 11 and a flow circuit that fluidically connects these structural components with one another, in which a refrigerant that means a working medium is guided.
  • a heat pump device 10 This has, in a known manner, a compressor, a condenser, an expansion element in the form of a throttle, an evaporator 11 and a flow circuit that fluidically connects these structural components with one another, in which a refrigerant that means a working medium is guided.
  • the heat pump device 10 is a so-called air-water heat pump device. When used as intended, this extracts thermal energy from the ambient air, which is transferred to the working medium of the heat pump device 10 that is guided in the flow circuit. This takes place in the evaporator 11.
  • the evaporator 11 is arranged in an air duct 15.
  • This is according to the embodiment Fig. 1 divided horizontally by means of a partition plate 26, whereby a first channel section 16 and a second channel section 17 are provided.
  • ambient air enters the first duct section 16 via an air inlet opening 18 and is then fed in accordance with the method shown in FIG Figure 1
  • the arrows shown are circulated and arrives via the second duct section 17 to an air outlet opening 19 through which the sucked-in air is returned to the environment.
  • a fan wheel 21 is provided which is arranged in the air duct 15 and can be designed as a radial fan wheel or as an axial fan wheel.
  • both the air inlet opening 18 and the air outlet opening 19 are formed on the front of the dishwasher 1.
  • the first duct section 16 has the air inlet opening 18 and the second duct section 17 has the air outlet opening 19.
  • the evaporator 11 is arranged within the air duct 15. By dividing the air channel 15 into two channel sections 16 and 17, the evaporator 11 is also Fluidically divided, so that a first evaporator section 22 located in the first channel section 16 and a second evaporator section 23 located in the second channel section 17 are provided. When used as intended, the air drawn in through the evaporator 11 therefore flows twice, a first time in the first channel section 16 in the direction of the fan wheel 21 and a second time in the second channel section 17 in the direction of the outlet opening 19.
  • the kitchen unit is equipped with a skirting board 12.
  • a passage 13 is made in this through which the air duct 15 protrudes at the end.
  • a panel 14 is provided for fixing the position of the air duct 15 with respect to the baseboard 12 and for visually appealing covering of the gap between the air duct 15 and the baseboard 12.
  • the split air flow through the evaporator 11 results in a design of the heat pump device 10 that is optimized in terms of installation space. In addition, an increase in efficiency is achieved as a result. Because the separation of the evaporator 11 in two directions of flow increases the flow rate through the evaporator 11 with the same volume flow and the same dimensions of the evaporator 11. This causes an improved heat transfer from the air to the working medium, which increases the efficiency of the heat pump device 10.
  • the embodiment according to the invention also provides a simplified assembly at the installation site, since all that is required is the formation of the passage 13 in the baseboard 12 for the dishwasher 1 to be integrated into the kitchen unit as intended. Further air ducts and / or seals against other devices and / or furniture in the kitchen unit are not required.
  • Fig. 2 shows a second embodiment, namely in a schematic plan view from above.
  • the air duct 15 is not divided horizontally but vertically into the two duct sections 16 and 17.
  • a fluidic part of the evaporator 11 is provided in the first evaporator section 22 and the second evaporator section 23, which results in the flow division in the evaporator 11 already explained above.
  • a second channel 29 is fluidically connected to the air channel 15.
  • a pivotable actuator in the form of a flap 30 the fluidic transition from the air duct 15 to the second duct 29 can either be closed or opened.
  • Fig. 2 shows the closed position.
  • a further actuator in the form of a pivotable flap 28 is provided between the evaporator 11 and the fan wheel 21, which serves to optionally close a passage opening 27.
  • a pivotable flap 28 is provided between the evaporator 11 and the fan wheel 21, which serves to optionally close a passage opening 27.
  • the flaps 28 and 30 are each in their closed position. This position is selected when the heat pump device 10 is operated as intended.
  • the ambient air flows as a supply air stream 24 via the air inlet opening 18 into the air duct 15.
  • a passage through the first evaporator section 22 then takes place in the first duct section 16.
  • the air flows through the second evaporator section 23 arranged in the second duct section 17, before it is then released again into the environment via the air outlet opening 19 as an exhaust air stream 25.
  • the flap 30 is completely transferred to its second position of use, so that only a supply air flow 24 is conveyed via the second channel section 17.
  • An alternative position of the flap 30 is shown in FIG Fig. 8 shown. According to this position, air can be returned via the second duct section.
  • the passage opening 27 between the two channel sections 16 and 17 is closed in such a position of the flap 30.
  • the result of this flap position is that some of the air drawn in is conveyed into the second channel 29 and another part is output in countercurrent through the evaporator 11 back at the front.
  • the division into these two partial flows is determined by the position of the flap 30.
  • Fig. 4 leaves one to the embodiment Fig. 3 recognize slightly modified embodiment.
  • the partition plate 26 is aligned at a slight angle to the horizontal in the area of the two openings 18 and 19. This results in a fluidic separation of supply air flow 24 and exhaust air flow 25, which helps reduce a short-circuit air flow.
  • Fig. 5 shows in a further embodiment a horizontal separation of the air duct 15. According to this embodiment, it is provided to incline the evaporator 11 to the horizontal so that any condensate accumulating in the evaporator 11 can flow away following gravity. This results in faster drying of the evaporator 11.
  • FIG. 6 Another embodiment is in Fig. 6 shown. Thereafter, an inflow opening 31 is provided through which warm base air can flow into the second duct section 17 if necessary.
  • This has the advantage that the air that is passed through the evaporator 11 and is thereby cooled is warmed up with base air supplied from the outside, whereby the exhaust air flow 25 is brought to a higher temperature level. This serves to improve the comfort of a user of the dishwasher 1 who is at the front of the dishwasher 1.
  • An inflow opening 32 can also be provided with respect to the first channel section 16. This serves to enrich the supply air stream 24 with warmed base air. In this way, the heat transfer in the evaporator from the air to the working medium can be increased.

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  • Washing And Drying Of Tableware (AREA)
EP20167646.7A 2019-04-04 2020-04-02 Lave-vaisselle, en particulier lave-vaisselle électroménager Active EP3718459B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019108883.6A DE102019108883A1 (de) 2019-04-04 2019-04-04 Geschirrspülmaschine, insbesondere Haushaltsgeschirrspülmaschine

Publications (2)

Publication Number Publication Date
EP3718459A1 true EP3718459A1 (fr) 2020-10-07
EP3718459B1 EP3718459B1 (fr) 2022-07-20

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EP20167646.7A Active EP3718459B1 (fr) 2019-04-04 2020-04-02 Lave-vaisselle, en particulier lave-vaisselle électroménager

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DE (1) DE102019108883A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3987999A1 (fr) * 2020-10-22 2022-04-27 LG Electronics Inc. Lave-vaisselle
EP4066720A1 (fr) * 2021-04-02 2022-10-05 Arçelik Anonim Sirketi Lave-vaisselle comprenant une pompe à chaleur

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2682036A2 (fr) * 2012-07-03 2014-01-08 Miele & Cie. KG Lave-vaisselle et procédé de chauffage d'un bain de rinçage dans un lave-vaisselle
CN105476584A (zh) * 2014-09-19 2016-04-13 杭州三花研究院有限公司 热泵型餐具清洗机及其控制方法
US9468355B2 (en) * 2013-02-26 2016-10-18 Miele & Cie. Kg Automatic dishwasher
US20170028447A1 (en) * 2014-04-07 2017-02-02 Indesit Company S.P.A. Washing and drying machine
EP3427628A1 (fr) 2017-07-12 2019-01-16 Miele & Cie. KG Lave-vaisselle et son procédé de fonctionnement

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012105902A1 (de) * 2012-07-03 2014-05-08 Miele & Cie. Kg Geschirrspülmaschine und Verfahren zum Betreiben einer Geschirrspülmaschine
CN204192550U (zh) * 2014-09-19 2015-03-11 杭州三花研究院有限公司 热泵型餐具清洗机
DE102015222959B3 (de) * 2015-11-20 2016-12-29 BSH Hausgeräte GmbH Geschirrspülmaschine mit einer Wärmepumpe
DE102017115585B4 (de) * 2017-07-12 2019-08-29 Miele & Cie. Kg Geschirrspülmaschine und Verfahren zum Betreiben einer Geschirrspülmaschine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2682036A2 (fr) * 2012-07-03 2014-01-08 Miele & Cie. KG Lave-vaisselle et procédé de chauffage d'un bain de rinçage dans un lave-vaisselle
US9468355B2 (en) * 2013-02-26 2016-10-18 Miele & Cie. Kg Automatic dishwasher
US20170028447A1 (en) * 2014-04-07 2017-02-02 Indesit Company S.P.A. Washing and drying machine
CN105476584A (zh) * 2014-09-19 2016-04-13 杭州三花研究院有限公司 热泵型餐具清洗机及其控制方法
EP3427628A1 (fr) 2017-07-12 2019-01-16 Miele & Cie. KG Lave-vaisselle et son procédé de fonctionnement

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3987999A1 (fr) * 2020-10-22 2022-04-27 LG Electronics Inc. Lave-vaisselle
US11659976B2 (en) 2020-10-22 2023-05-30 Lg Electronics Inc. Dishwasher having condensing duct and return duct
EP4066720A1 (fr) * 2021-04-02 2022-10-05 Arçelik Anonim Sirketi Lave-vaisselle comprenant une pompe à chaleur

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Publication number Publication date
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DE102019108883A1 (de) 2020-10-08

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