EP3335613A1 - Dispositif pour la condensation de vapeur dans une circulation d'air d'un lave-vaisselle industriel ou semblable - Google Patents

Dispositif pour la condensation de vapeur dans une circulation d'air d'un lave-vaisselle industriel ou semblable Download PDF

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Publication number
EP3335613A1
EP3335613A1 EP16425113.4A EP16425113A EP3335613A1 EP 3335613 A1 EP3335613 A1 EP 3335613A1 EP 16425113 A EP16425113 A EP 16425113A EP 3335613 A1 EP3335613 A1 EP 3335613A1
Authority
EP
European Patent Office
Prior art keywords
water
condensation
recirculation
condensation chamber
pipe
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.)
Withdrawn
Application number
EP16425113.4A
Other languages
German (de)
English (en)
Inventor
Andrea Ambrosi
Eros Pinaroli
Andrea Zinetti
Mauro Tosi
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.)
Bonferraro SpA
Original Assignee
Bonferraro SpA
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 Bonferraro SpA filed Critical Bonferraro SpA
Priority to EP16425113.4A priority Critical patent/EP3335613A1/fr
Publication of EP3335613A1 publication Critical patent/EP3335613A1/fr
Withdrawn legal-status Critical Current

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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
    • A47L15/48—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
    • A47L15/24—Washing or rinsing machines for crockery or tableware with movement of the crockery baskets by conveyors
    • A47L15/241—Washing or rinsing machines for crockery or tableware with movement of the crockery baskets by conveyors the dishes moving in a horizontal plane
    • 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
    • A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
    • 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
    • A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
    • A47L15/4219—Water recirculation

Definitions

  • the present invention relates to industrial dishwashers or the like, and in particular to a device for the quick condensation of the steam present in the air that is discharged by said machines.
  • an industrial dishwasher operates at high temperatures of the wash/rinse water that imply the generation of a significant amount of steam, therefore an inconvenience to the user is the significant release of steam when the dishwasher is opened at the end of the wash cycle.
  • the dishwasher must include also a steam condenser located in an air recirculation circuit that provides the condensation of the steam prior to the opening of the dishwasher, so as to prevent it from being released in the environment with adverse effects on the operator and/or on other machines present in the room also due to the significant change in temperature and humidity.
  • a water condenser generally operates with cold water that is atomized in the air recirculation circuit through which the steam passes, so that the cooling of the steam and of the condenser walls causes the condensation of the water vapour.
  • a water condenser therefore essentially consists of a condensation chamber with relevant inlet/outlet ducts, a water load pipe provided with a valve, a plurality of spraying nozzles fed through said pipe and arranged in said chamber, a pipe for draining water from the condensation chamber and a level sensor arranged in the chamber to detect the lack of water supply or drain.
  • a conventional condenser has a very simple operation, controlled by a relevant control unit, which consists in opening the water load valve for a pre-set time at the end of the rinse phase, with parallel activation of a fan such that the moist air present in the wash tank circulates between the condenser and the wash tank and the steam contained in said moist air is condensed by means of repeated passages through the condenser.
  • the water fed to the condenser and the same condensate coming from the moist air are used in the following wash cycle, whereby the pipe for draining water from the condensation chamber is preferably connected to a water heater where the water will be heated for use in the following rinse. It should be noted that a power saving is also achieved in this way, since the water is already partially heated from the contact with the steam and the condenser walls.
  • This known arrangement has the drawback that it cannot strike an optimal balance between the contrasting requirements of achieving a sufficient condensation of the steam, minimizing the consumption of water and power, and not excessively lengthening the duration of the wash cycle that is a very important parameter in an industrial dishwasher. It must also be noted that the amount of steam to be condensed depends on the volume of the wash tank, on the temperature of the rinse water and on the type of load whereby this variability makes it even more difficult to achieve an optimal condensation.
  • the condenser is designed to operate with given nominal conditions and cannot take into account the actual operating conditions of the machine.
  • the amount of generated steam may be greater or smaller, the temperature of the condensation water may be higher or lower, and the flow rate of the water sprayed by the nozzles may be higher or lower due to an increased or reduced pressure in the water mains system and/or a clogging of the water supply circuit (e.g. in the filters or the sprayers themselves).
  • an insufficient condensation may be due to the fact that the amount of water required for the rinse in the following cycle is not sufficient to condense all the steam. In that case, if the water is loaded in the amount required to condense all the steam a portion of the water will be wasted since it is in excess for the rinse in the following cycle.
  • the object of the present invention is to provide a device for the condensation of steam that is free from said drawbacks. Said object is achieved by means of a device comprising a recirculation pump for the water loaded in the condenser that is returned to the nozzles through a recirculation duct.
  • a device comprising a recirculation pump for the water loaded in the condenser that is returned to the nozzles through a recirculation duct.
  • Other advantageous features of the present device are specified in the dependent claims, in particular the use of a thermal and/or hygrometric probe that is able to detect the temperature and/or the humidity of the air that is being recirculated, as well as various alternatives for the loading of the condensation water.
  • the main advantage of the present device is that of minimizing the water and power consumption and achieving an optimal steam condensation in the shortest possible time regardless of the operating conditions of the machine.
  • a second significant advantage of this device is that of having a simple structure that is easily applicable to any industrial dishwasher. This device can therefore also be applied as an upgrade on an existing machine without requiring particular changes to the structure of the machine and/or to the arrangement of the components thereof.
  • a device conventionally includes a condensation chamber 1 with relevant inlet 2 and outlet 3 ducts that form the recirculation circuit of the moist air (indicated by the arrows) coming from the wash tank 4 of the dishwasher in which the device is introduced.
  • the air circulation is guaranteed by a fan 5 that can be positioned upstream from (as in Fig.1 ) or downstream from the condensation chamber 1 depending on the space requirements of the dishwasher in which it is installed.
  • the water sprayed by nozzles 8 and the condensed steam are discharged from chamber 1 through a drain pipe 9 that conveys them to a water heater 10 where they will be heated for use in the following rinse.
  • the amount of water loaded in the device is monitored by a level sensor (not shown) such as a system with a pressure switch, float or magnet that is operatively connected to a control unit (not shown) that controls also the opening and closing of valve 7 and the operation of fan 5.
  • the novel aspect of the present device lies in the presence of a recirculation pump 11 that draws the condensation water from the base of chamber 1 and returns it to shower 8 at the top of said chamber 1 through a recirculation duct 12. It should be noted that in order to maintain a minimum water level in the condensation chamber 1, necessary for the correct functioning of the recirculation pump 11, the drain 9 that conveys the water to the water heater 10 is arranged at a certain distance from the bottom of chamber 1 so as to act as an overflow pipe.
  • a thermal probe (not shown) that is operatively connected to the control unit so as to provide a feedback about the condensation action carried out in chamber 1.
  • said probe detects the temperature of the air and transmits it to the control unit which can thus control the activation of fan 5 and pump 11 taking into account the fact that a temperature higher than expected indicates an insufficient condensation and therefore it is necessary to extend the operating time of the condenser and vice versa a temperature lower than expected indicates that it is possible to anticipate the end of the condensation phase.
  • the thermal probe may obviously be of any type suitable for the purpose, and in order to further optimize the control and effectiveness of the condensing device the probe may be a thermo-hygrometric probe that detects not only the temperature but also the humidity of the outgoing air, or a separate hygrometric probe can be combined with the thermal probe or even used instead of the latter.
  • the pipe 6 supplying the mains water extends up to an air break 13 from which a connection pipe 14 conveys the water to the base of the condensation chamber 1 where pump 11 sends it to shower 8 through duct 12.
  • air break 13 is provided for compliance with the hygienic norms required in some countries, but its presence is not indispensable for the operation of the condenser.
  • pipe 6 is connected directly to the base of the condensation chamber 1
  • pipe 6 is connected directly to shower 8 at the top of the condensation chamber 1, whereby in both cases the water is loaded without passing through the air break 13.
  • the embodiments of the device according to the invention described and illustrated above are just examples susceptible of various modifications.
  • the shape, size and arrangement of the condensation chamber 1 and of the ducts/pipes 2, 3, 6, 9, 12 and 14 can be varied according to the needs, same as the type and exact position of pump 11 as long as it is capable of recirculating the water in the condenser, as well as the possible thermal and/or hygrometric probe as long as it is arranged in the air recirculation circuit.
  • the dishwasher illustrated in Fig.1 is an undertop front-load dishwasher
  • the above-described condensing device can be applied to other types of machine, such as a hood-type dishwasher or a washing and disinfecting machine, through a simple adaptation of the size and arrangement of the components and/or of the type of circuit that is within the knowledge of a person skilled in the art.

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  • Washing And Drying Of Tableware (AREA)
EP16425113.4A 2016-12-19 2016-12-19 Dispositif pour la condensation de vapeur dans une circulation d'air d'un lave-vaisselle industriel ou semblable Withdrawn EP3335613A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16425113.4A EP3335613A1 (fr) 2016-12-19 2016-12-19 Dispositif pour la condensation de vapeur dans une circulation d'air d'un lave-vaisselle industriel ou semblable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16425113.4A EP3335613A1 (fr) 2016-12-19 2016-12-19 Dispositif pour la condensation de vapeur dans une circulation d'air d'un lave-vaisselle industriel ou semblable

Publications (1)

Publication Number Publication Date
EP3335613A1 true EP3335613A1 (fr) 2018-06-20

Family

ID=58053959

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16425113.4A Withdrawn EP3335613A1 (fr) 2016-12-19 2016-12-19 Dispositif pour la condensation de vapeur dans une circulation d'air d'un lave-vaisselle industriel ou semblable

Country Status (1)

Country Link
EP (1) EP3335613A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112773290A (zh) * 2020-12-31 2021-05-11 唐妍涤 一种空气洗碗机真空冷凝泵

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3026628A (en) * 1956-08-07 1962-03-27 Whirlpool Co Drying system for dishwashers
GB1247788A (en) * 1969-05-30 1971-09-29 Zanussi A Spa Industrie Apparatus for drying washing
DE4212965A1 (de) * 1992-04-18 1993-10-21 Bauknecht Hausgeraete Kondenswäschetrockner
DE19522307A1 (de) * 1995-06-20 1997-01-02 Bosch Siemens Hausgeraete Zum Trocknen eingerichtete Wasch- oder Geschirrspülmaschine
EP2241242A2 (fr) * 2009-04-14 2010-10-20 Lg Electronics Inc. Lave-vaisselle
EP2604165A1 (fr) * 2011-12-13 2013-06-19 Miele & Cie. KG Lave-vaisselle automatique
WO2015119672A1 (fr) * 2014-02-05 2015-08-13 Electrolux Home Products, Inc. Lave-vaisselle, ensemble porte pour lave-vaisselle, et procédé associé de séchage de vaisselle

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3026628A (en) * 1956-08-07 1962-03-27 Whirlpool Co Drying system for dishwashers
GB1247788A (en) * 1969-05-30 1971-09-29 Zanussi A Spa Industrie Apparatus for drying washing
DE4212965A1 (de) * 1992-04-18 1993-10-21 Bauknecht Hausgeraete Kondenswäschetrockner
DE19522307A1 (de) * 1995-06-20 1997-01-02 Bosch Siemens Hausgeraete Zum Trocknen eingerichtete Wasch- oder Geschirrspülmaschine
EP2241242A2 (fr) * 2009-04-14 2010-10-20 Lg Electronics Inc. Lave-vaisselle
EP2604165A1 (fr) * 2011-12-13 2013-06-19 Miele & Cie. KG Lave-vaisselle automatique
WO2015119672A1 (fr) * 2014-02-05 2015-08-13 Electrolux Home Products, Inc. Lave-vaisselle, ensemble porte pour lave-vaisselle, et procédé associé de séchage de vaisselle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112773290A (zh) * 2020-12-31 2021-05-11 唐妍涤 一种空气洗碗机真空冷凝泵

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