EP0747140B1 - Procédé et dispositif pour rincer et/ou sécher des articles soumis à un procédé de nettoyage - Google Patents

Procédé et dispositif pour rincer et/ou sécher des articles soumis à un procédé de nettoyage Download PDF

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Publication number
EP0747140B1
EP0747140B1 EP96201507A EP96201507A EP0747140B1 EP 0747140 B1 EP0747140 B1 EP 0747140B1 EP 96201507 A EP96201507 A EP 96201507A EP 96201507 A EP96201507 A EP 96201507A EP 0747140 B1 EP0747140 B1 EP 0747140B1
Authority
EP
European Patent Office
Prior art keywords
tank
articles
rinsing
valve
rinsing liquid
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.)
Expired - Lifetime
Application number
EP96201507A
Other languages
German (de)
English (en)
Other versions
EP0747140A3 (fr
EP0747140A2 (fr
Inventor
Luca Scalco
Denis Scalco
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.)
C.S.R. DI BROTTO LUIGIA
Original Assignee
Csr Di Brotto Luigia
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 Csr Di Brotto Luigia filed Critical Csr Di Brotto Luigia
Publication of EP0747140A2 publication Critical patent/EP0747140A2/fr
Publication of EP0747140A3 publication Critical patent/EP0747140A3/fr
Application granted granted Critical
Publication of EP0747140B1 publication Critical patent/EP0747140B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G3/00—Apparatus for cleaning or pickling metallic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/04—Cleaning involving contact with liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/04—Cleaning involving contact with liquid
    • B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect

Definitions

  • the present invention generally refers to the rinsing and drying of articles that have been subjected to a washing process.
  • the vapor is admitted into a cleaning chamber when a previously introduced media, e.g. a washing liquid, has been already evacuated from the chamber.
  • a previously introduced media e.g. a washing liquid
  • the object of the present invention is to obtain quickly and reliably dried articles that have been submitted to washing and rinsing processes, having a surfaces stainless and devoid of stains.
  • an apparatus comprises at least a rinsing tank 1 adapted to contain the articles to be subjected to the washing and/or rinsing and/or drying tratments, which is designed to withstand the stresses due to pressures both higher and lower than the atmospheric pressure as well as to resist to oxidative agents.
  • the tank 1 can be hermetically closed by means of a cover 2 that is manually or automatically operated.
  • the apparatus comprises two of such tanks so that in one of them a lot of articles can be rinsed while in the other another lot of articles is being dried.
  • the heating source 30 of the vapor generator can be one of the conventional sources, such as an electric heater, a heat exchanger, a furnace burning a liquid, solid or gasous fuel, a heat pump, a sun-powered heater, a gas compressor, etc.
  • the condenser 4 comprises a container housing a coil 21 and can be selectively communicated with the tank 1 through a valve 17.
  • a pumping assembly 7 comprising a pump and two valves 13 and 14, is connected to the bottom of the tank 1 through a valve 12. This pumping assembly is used for pumping the rinsing liquid into the tank 1 and for its extraction. Valve 13 communicates the assembly with a reservoir of rinsing liquid 19.
  • the apparatus is preferably equipped with a storage tank 8 communicating with the tank 1 through a valve 11 and a conduit length opening in the the upper portion of the tank sidewall, for the pollutant or otherwise harmful rinsing fluids.
  • the apparatus of the invention further comprises auxiliary components such as a cooling device 5 and a pump-ejector assembly 6.
  • the cooling device 5 is of conventional design and comprises a cylinder-piston assembly 27, a refrigerating coil 28 and a fan 29 and communicates through a valve 21 with the cooling and condensing device 4.
  • the pump-ejector assembly 6 includes an ejector 23, a pump 24 and a (second) condenser 25.
  • the ejector 23 communicates with the cooling and condensing device 4, whereas a valve 18 is interposed between the second condenser 25 and the cooling device 5.
  • the pump-ejector assembly 6 is used, when required, for extracting from the tank 1 the condensed fluids and possible gases that are not condensable when the tank is under vacuum conditions.
  • the assembly 6 is preferably provided for ensuring the expulsion of air that might have passed through the seals.
  • the apparatus of the invention comprises additional automation devices such as valves, solenoid valves, automatic hydraulic cylinders, etc. All the valves and the devices of the apparatus are controlled and operated by a central control unit, preferably provided with a PLC or a programmed microprocessor.
  • a central control unit preferably provided with a PLC or a programmed microprocessor.
  • the apparatus of the invention When the apparatus of the invention is arranged in an automated washing plant, its working is properly coordinated with the working of the main plant.
  • a plate 22 is provided within the tank 1A, this plate being cooled by a coil 26 at programmed times, thus acting as a condenser. Both the additional plate 22 and the main condenser 4 can be used for enhancing the drying stage.
  • the cooling is preferably carried out within the tank 1 in order to strongly reduce the level of harmful vapors and to generate a gas trap for retaining the vapors within the tank during the loading and unloading of the articles.
  • the operating cycle is started by introducing the articles into the empty tank 1 after removing or opening the cover 2.
  • the articles can be positioned in the rinsing tank 1 either manually or automatically and the tank contains supporting means or devices (not shown) accomodating the shape and types of the articles to be rinsed.
  • the cover 2 is tightly sealed and the tank is filled with a rinsing liquid from the pump assembly 7 and the valve 11 is opened so that the air is expelled from the tank 1 and forced into the air storage tank 8.
  • the valve 11 is closed.
  • the articles are subjected to a conventional rinsing cycle as desired or requested.
  • the rinsing liquid is slowly drained from the tank through the pump assembly 7 and returned to the reservoir 19.
  • the drainage is slowly accomplished in such a manner that the descending liquid surface "washes" the articles located in the tank 1.
  • valve 15 is opened for admitting into the tank 1 a vapor under pressure from the generator 3, the vapor occupying the vacant space left by the rinsing liquid being drained.
  • the temperature of the vapor from generator 3 is higher than that of the rinsing liquid, and preferably the vapor is similar to the rinsing liquid. In all cases the vapor is not of a type capable of reacting with the rinsing liquid or causing other negative phoenomena.
  • This vapor flows through the portions of the articles emerging from the surface of the liquid being drained and transfers thermal energy to the articles. Since the emerging portions of the articles are initially at the same temperature of the rinsing liquid (i.e. colder than the incoming vapor), the vapor condensates over the emerging portions of the articles and the droplets run down the article surfaces with an additional rinsing or microwashing of said surfaces.
  • This process takes place in a continuous manner on the surfaces that progressively emerge from the liquid.
  • the incoming hot vapor raises the temperature of the article surfaces so that their temperature tends to equal that of the incoming vapor.
  • valve 15 is then closed thus stopping the admission of the vapor, and by opening tha valve 17 the tank 1, now emptied of any liquid, is communicated with the cooling and condensing device (condenser) 4, schematically represented in Fig. 1 by a tank housing a coil 21 in which a refrigerator flows.
  • the vapor from the tank 1 progressively expands in the condenser 4 and the condensated vapor is collected within the tank, thus creating a vacuum within the tank 1. Since the articles are at a suitable temperature and are covered by a liquid film, the vacuum causes the boiling of the liquid film.
  • the thermal content of the articles can be enough to continue the boiling process until the complete vaporization of the liquid covering the articles, also thanks to the degree of the vacuum produced.
  • the above sequence of operations is correspondently shortened. More particularly, the articles are arranged within the tank 1 and the cover 2 is airtigh closed. Then the tank 1 is communicated with the storage tank 8 by opening the valve 11 so that the air within the tank 1 can migrate into tank 8, and the valve 15 towards the vapor generator 3 is opened. Then the valve 11 in the conduit communicating the tank 1 with the tank 8 is closed, while maintaning open the valve 15 that allows the admission into the tank 1 of vapor that heats the articles.
  • the whole liquid film covering the articles has been evaporated, that is if the thermal energy stored by the articles is large enough.
  • the cycle is repeated.
  • the invention accomplishes the following advantages over the prior art apparatuses and processes.
  • the process is ecological in that the emission of pollutants into the environment is null or negligible, as a function of the type of fluid that is used.
  • the apparatus works with any type of fluid or other substance that is evaporable at a pressure lower or higher than the atmospheric pressure.
  • the process of the invention can replace the whole washing cycle, while maintaining unaltered the working principle.

Claims (11)

  1. Processus pour rincer des articles, comprenant les étapes de :
    a) positionnement des articles à traiter à l'intérieur d'un réservoir (1) et fermeture hermétique dudit réservoir (1) ;
    b) remplissage dudit réservoir (1) avec un liquide de rinçage, tout en expulsant l'air présent dans le réservoir (1) ;
    c) draínage lent du liquide de rinçage dudit réservoir (1) ;
    d) admission dans ledit réservoir (1) d'un flux de vapeur chaude ayant une température supérieure à celle du liquide de rinçage ;
    e) maintien du flux de vapeur chaude après le draínage complet du liquide de rinçage et jusqu'à ce que lesdits articles stockent une quantité donnée d'énergie thermique ;
    f) arrêt du flux de vapeur chaude et création d'un vide à l'intérieur dudit réservoir (1) pour provoquer une ébullition du film de liquide recouvrant les articles jusqu'à ce qu'ils soient complètement secs ;
    g) ouverture dudit réservoir (1) et retrait desdits articles rincés et séchés,
    caractérisé en ce que lesdites étapes c) et d) sont effectuées simultanément, de telle sorte que la vapeur se condense sur les surfaces des articles tandis qu'ils émergent progressivement du liquide de rinçage descendant, à la suite de quoi un lavage supplémentaire est obtenu par le ruissellement du film de liquide recouvrant lesdits articles.
  2. Processus selon la revendication 1, caractérisé en ce que ledit vide est généré en faisant communiquer ledit réservoir (1) avec un dispositif (4) de refroidissement et de condensation.
  3. Processus selon la revendication 1, caractérisé en ce que ledit vide est généré par refroidissement d'une surface (22) située à l'intérieur du réservoir (1A).
  4. Processus selon les revendications précédentes,
    caractérisé en ce que lesdits articles dans le réservoir de rinçage (1) sont refroidis initialement par le liquide de rinçage, de telle sorte que lorsque ledit liquide de rinçage est draíné lentement, leurs parties émergeantes agissent comme des corps de condensation pour la valeur chaude entrante et sont recouverts par un film liquide qui ruisselle vers le bas des surfaces d'articles, en obtenant un micro-lavage desdites surfaces.
  5. Appareil pour la mise en oeuvre du processus selon la revendication 1, comprenant :
    au moins un réservoir de rinçage (1) qui peut être fermé de manière hermétique au moyen d'un couvercle (2), pour contenir lesdits articles ;
    un générateur (3) de vapeur relié audit réservoir (1) par l'intermédiaire d'une première soupape (15) ;
    un assemblage de pompage (7) relié au réservoir (1) par l'intermédiaire d'une deuxième soupape (12) pour pomper le liquide de rinçage dans ledit réservoir (1) et pour extraire de celui-ci ledit liquide de rinçage ;
    un dispositif (4) de refroidissement et de condensation de vapeur relié audit réservoir (1) par l'intermédiaire d'une troisième soupape (17),
    caractérisé en ce que ledit appareil comprend en outre une unité de commande centrale apte à commander et à actionner l'admission dans ledit réservoir (1) de valeur chaude par l'intermédiaire de ladite première soupape (15) et à libérer simultanément une deuxième soupape (12) pour draíner le liquide de rinçage dudit réservoir (1) par l'intermédiaire de ladite deuxième soupape (12).
  6. Appareil selon la revendication 5, caractérisé en ce que ledit moyen pour commander et actionner comprend un PLC ou un microprocesseur programmé.
  7. Appareil selon la revendication 5 ou 6, caractérisé en ce qu'il comprend en outre un réservoir de stockage (8) communiquant avec ledit réservoir (1) par l'intermédiaire d'une quatrième soupape (11) pour stocker l'air expulsé du réservoir (1) lorsque le liquide de rinçage est polluant ou dangereux.
  8. Appareil selon les revendication 5 à 7, caractérisé en ce qu'il comprend en outre un dispositif de refroidissement (5) comportant un assemblage à cylindre-piston (27), un serpentin réfrigérant (28) et un ventilateur (29) et communiquant par l'intermédiaire d'une cinquième soupape (21) avec ledit dispositif (4) de refroidissement et de condensation.
  9. Appareil selon les revendications 5 à 8,
    caractérisé en ce qu'il comprend en outre un assemblage (6) à pompe-éjecteur pour extraire du réservoir (1) des fluides et des gaz condensés qui n'ont pas été condensés lorsque le réservoir était dans une condition de vide, ledit assemblage (6) à pompe-éjecteur comportant un éjecteur (23), une pompe (24) et un deuxième condenseur (25), ledit éjecteur (23) communiquant avec ledit dispositif (4) de refroidissement et de condensation, et une sixième soupape (18) située entre le deuxième condenseur (25) et le dispositif de refroidissement (5).
  10. Appareil selon les revendications 5 à 9, caractérisé en ce qu'une plaque (22) qui peut être refroidie par un serpentin (26) est disposée à l'intérieur du réservoir (1A).
  11. Appareil selon les revendications 5 à 10, caractérisé en ce qu'il comprend deux réservoirs de rinçage.
EP96201507A 1995-06-06 1996-05-30 Procédé et dispositif pour rincer et/ou sécher des articles soumis à un procédé de nettoyage Expired - Lifetime EP0747140B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPD950113 1995-06-06
IT95PD000113A IT1281893B1 (it) 1995-06-06 1995-06-06 Procedimento per il risciacquo e/o l'asciugatura in ambiente pressurizzato di oggetti in precedenza lavati, ed impianto per

Publications (3)

Publication Number Publication Date
EP0747140A2 EP0747140A2 (fr) 1996-12-11
EP0747140A3 EP0747140A3 (fr) 1997-10-15
EP0747140B1 true EP0747140B1 (fr) 2001-10-24

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ID=11391073

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Application Number Title Priority Date Filing Date
EP96201507A Expired - Lifetime EP0747140B1 (fr) 1995-06-06 1996-05-30 Procédé et dispositif pour rincer et/ou sécher des articles soumis à un procédé de nettoyage

Country Status (5)

Country Link
EP (1) EP0747140B1 (fr)
AT (1) ATE207391T1 (fr)
DE (1) DE69616154T2 (fr)
ES (1) ES2166423T3 (fr)
IT (1) IT1281893B1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0221028A1 (fr) * 1985-10-24 1987-05-06 ECOLSIR S.r.l. Procédé pour désinfecter des dispositifs et autres matériaux contaminés par le PCB ou d'autres substances toxiques et nuisibles
EP0642845A1 (fr) * 1993-08-13 1995-03-15 BRANSON ULTRASCHALL Niederlassung der EMERSON TECHNOLOGIES GmbH & CO. Appareil pour le nettoyage, rinçage et séchage des pièces

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5180438A (en) * 1989-10-11 1993-01-19 Hockh Metall-Reinigungsanlagen Gmbh Cleaning and drying system
JPH0757913B2 (ja) * 1989-10-27 1995-06-21 オリエンタルエンヂニアリング株式会社 脱脂洗浄方法および装置
JP3393389B2 (ja) * 1992-10-30 2003-04-07 株式会社日本ヘイズ 真空脱脂洗浄方法と真空洗浄機
US5454390A (en) * 1994-05-16 1995-10-03 International Business Machines Corporation Vapor rinse-vapor dry process tool

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0221028A1 (fr) * 1985-10-24 1987-05-06 ECOLSIR S.r.l. Procédé pour désinfecter des dispositifs et autres matériaux contaminés par le PCB ou d'autres substances toxiques et nuisibles
EP0642845A1 (fr) * 1993-08-13 1995-03-15 BRANSON ULTRASCHALL Niederlassung der EMERSON TECHNOLOGIES GmbH & CO. Appareil pour le nettoyage, rinçage et séchage des pièces

Also Published As

Publication number Publication date
EP0747140A3 (fr) 1997-10-15
DE69616154D1 (de) 2001-11-29
EP0747140A2 (fr) 1996-12-11
ATE207391T1 (de) 2001-11-15
DE69616154T2 (de) 2002-07-04
ES2166423T3 (es) 2002-04-16
IT1281893B1 (it) 1998-03-03
ITPD950113A0 (it) 1995-06-06
ITPD950113A1 (it) 1996-12-06

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