EP1249263B1 - Procédé pour le fonctionnement d'un dispositif de nettoyage - Google Patents

Procédé pour le fonctionnement d'un dispositif de nettoyage Download PDF

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Publication number
EP1249263B1
EP1249263B1 EP02007976A EP02007976A EP1249263B1 EP 1249263 B1 EP1249263 B1 EP 1249263B1 EP 02007976 A EP02007976 A EP 02007976A EP 02007976 A EP02007976 A EP 02007976A EP 1249263 B1 EP1249263 B1 EP 1249263B1
Authority
EP
European Patent Office
Prior art keywords
working chamber
solvent
condenser
pressure
vapour
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
EP02007976A
Other languages
German (de)
English (en)
Other versions
EP1249263A3 (fr
EP1249263A2 (fr
Inventor
Horst Erbel
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.)
Pero AG P Erbel Maschinen- und Apparatebau
Original Assignee
Pero AG P Erbel Maschinen- und Apparatebau
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 Pero AG P Erbel Maschinen- und Apparatebau filed Critical Pero AG P Erbel Maschinen- und Apparatebau
Publication of EP1249263A2 publication Critical patent/EP1249263A2/fr
Publication of EP1249263A3 publication Critical patent/EP1249263A3/fr
Application granted granted Critical
Publication of EP1249263B1 publication Critical patent/EP1249263B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B08B2230/00—Other cleaning aspects applicable to all B08B range
    • B08B2230/01—Cleaning with steam

Definitions

  • the invention relates to a method for treating a material to be cleaned in a cleaning system.
  • a cleaning system Pero cleaning system 2500
  • runs a predetermined cleaning program in which a steam degreasing is provided.
  • a connection between the working chamber and a steam tank is made, whereby solvent vapor flows into the working chamber.
  • a drying process is initiated in which a fan delivers the solvent vapor from the treatment chamber to a condenser.
  • the condenser consists of a refrigeration unit operating at very low temperatures, which has a temperature of -40 ° C to -60 ° C, depending on the solvent used. This condenses the solvent vapor.
  • the solvent-containing air in the working chamber is sucked by applying a high negative pressure and fed to the condenser. From the condenser, the air passes to a gas collection tank. The air in the gas collection container still has residues of the solvent vapor. Now, a vent valve is opened, whereby fresh air can flow into the working chamber. If this normal pressure prevails, the working chamber is opened and the cleaned workpieces are removed.
  • the equipment required for this cleaning system is considerable, especially because of the designed as a refrigeration unit capacitor. Although this works at very low temperatures, it is not possible to completely free the solvent-containing air that is introduced in the drying process in the treatment chamber, after their suction from the solvent, so that a gas collection tank is required as an additional expense.
  • EP 0 581 113 A1 discloses a process for degreasing mechanical parts and a system used therefor, which contains a working chamber, a steam generator, a vacuum pump and a condenser.
  • a vacuum is first generated by the vacuum pump in the working chamber, after there were introduced the parts to be cleaned.
  • solvent vapor is introduced into the working chamber to condense on the parts and penetrate into the pores of the parts due to the vacuum.
  • liquid detergent is introduced into the working chamber.
  • the parts are rinsed and the dirt attached to them is removed.
  • the entire cleaning agent is then returned to a storage tank, from where it passes to a distillation device.
  • the working chamber is supplied again solvent vapor to release the last dirt.
  • a vacuum is again generated in the interior of the working chamber by the vacuum pump to completely evaporate the solvent, which is then passed to a first capacitor.
  • the air extracted by the vacuum pump is passed through a second condenser to an activated carbon filter, which retains odors and traces of solvent.
  • DE 199 39 032 A1 relates to a method for cleaning metal parts, in which, for rinsing the parts with high-pressure steam, the solvent vapor generated in an evaporator is fed via a compressor under high pressure to a working chamber. During subsequent vacuum drying, the solvent vapor is evacuated through the compressor. Only after reaching a predetermined minimum pressure, a valve is opened, so that outside air can flow into the working chamber until it reaches atmospheric pressure. In order to achieve a legally prescribed solvent concentration in this known method, here, the working chamber has to be flushed with ambient air and sucked when flushing the compressor air under high pressure in an additional adsorption filter.
  • a significant advantage of the method according to the invention is that it can dispense with the relatively expensive and maintenance-intensive refrigeration units. To carry out the process fewer and simpler components are required, whereby the maintenance costs can be reduced and the operating costs can be reduced. With the method according to the invention it is possible, in the low temperature range, e.g. Also to clean plastics, so that the CFCs can be replaced. Due to the low solvent output, the process can also be operated without expensive filter and recovery systems.
  • the cleaning system shown schematically contains a steam generator 1, in which liquid solvent is heated to produce a saturated solvent vapor.
  • a first steam line 2 with a shut-off valve 3 arranged therein leads to a pressure-tight closable working chamber 4, in which the parts to be cleaned are accommodated during the cleaning process.
  • a ventilation valve 5 is arranged at the working chamber 4.
  • a second steam line 6 with a steam pressure valve 7 leads to a first part 8a of an air- or water-cooled condenser 8.
  • the working chamber 4 is connected to a first vacuum pump 10 via a first suction line 9. In this line 9, a valve 11 is arranged.
  • the first vacuum pump 10 is also connected to the condenser 8 via a second suction line 12 in connection, in which a further valve 13 is interposed. From the working chamber 4 further performs a first branch line 14 with a valve 15 to the first part of the condenser 8. To the working chamber 4, a second branch line 16 is also connected, which leads via a valve 17 to a second vacuum pump 18. The output of the second vacuum pump 18 is connected via a further valve 19 to the input of a compressor 20, the output of which is in communication with a second part 8b of the condenser 8.
  • the solvent liquefied in part 8a of the two-part condenser 8 runs off via a first discharge line 21 into a water separator 22.
  • the liquefied in part 8b of the capacitor 8 solvent is a condensate separator 39 in the Water separator 22 leading drain line 21 initiated.
  • a connecting line 23 with a valve 24 leads to a pump 25 through which the solvent distillate can be pumped into a storage container 28 via a delivery line 27 which can be shut off by a further valve 26.
  • a supply line 30 for liquid solvent which is provided with a further valve 29, leads to the working chamber 4. Via this line 30, the liquid solvent heated in the reservoir can be introduced into the working chamber 4 to carry out a bath cleaning.
  • a second discharge line 31 For discharging the liquid solvent after bath cleaning is from the working chamber 4 from a second discharge line 31, which opens into the arranged between the water separator 22 and the pump 25 connecting line 23 upstream of the pump 25.
  • a filter 32 is interposed for filtering cleaning residues. Upstream and downstream of the filter 32 in each case a shut-off valve 33 and 34 is arranged in the drain line 31.
  • a drain valve 35 Also on the steam generator 1 is provided with a drain valve 35 third drain line 36 is provided, which also opens into the conduit 23.
  • Between the reservoir 28 and the steam generator 1 also has an overflow line 37 with a shut-off valve 38th
  • the vapor pressure in the steam generator 1 is controlled.
  • the vapor pressure valve is opened when an adjustable vapor pressure limit is exceeded and closed when falling below the desired vapor pressure.
  • a pressure corresponding to the equilibrium between evaporator and condensation temperature is established in the system.
  • this pressure is about 150 mbar.
  • the vapor temperature of trichlorethylene at 150 mbar is only about 40 ° C, which is e.g. is not sufficient to remove only at 55 ° C melting polishing pastes.
  • the adjustment of the vapor pressure valve may then be e.g. be chosen so that this opens only at 950 mbar, which corresponds to a steam temperature of about 83 ° C.
  • the steam pressure valve can thus be used to determine the optimum steam temperature for the solvent used and the particular application.
  • the operation of the cleaning system is as follows:
  • the air in the system is first sucked off via the vacuum pump 10.
  • continuous distillation may be accomplished without the vacuum pump 10 continuing to run.
  • the solvent vapor generated in the steam generator 1 flows with the valve 3 closed via the line 6 to the part 8a of the condenser 8 and is liquefied there.
  • the condensate emerging from the condenser 8 passes into the water separator 22.
  • the distillate separated there from the water is introduced by the pump 25 via the line 27 back into the reservoir 28. Excess solvent can be discharged via the overflow line 37 into the vapor pressure vessel 1.
  • the continuous distillation ensures a constant cleaning quality and prevents the solvent from accumulating with oils and fats.
  • the valve 11 is closed and it can be done the actual cleaning of the parts after a selectable cleaning program ,
  • valve 29 For washing the parts in a cleaning bath, the valve 29 is opened, whereby the working chamber 4 can be flooded with the solvent heated in the reservoir 28. After completion of the bath cleaning, the solvent is discharged through the then opened valves 33 and 34 and the filter 32 and can be returned via the pump 25 back into the reservoir 28.
  • valve 3 To carry out a vapor degreasing the valve 3 is opened, whereby the solvent saturated steam located in the steam generator 1 flows via the line 2 into the working chamber 4. In the working chamber 4, the material to be cleaned is freed by the solvent vapor from adhering grease or oil.
  • the valve 15 is opened, whereby saturated steam flows from the working chamber 4 to part 8a of the air- or water-cooled condenser 8 up to approximately the condensation pressure of the condenser and is liquefied there.
  • the condensate leaving the condenser 8 is returned to the reservoir 28 via the water separator 22 and the pump 25.
  • the valve 15 is closed and the valve 17 is opened.
  • the second vacuum pump 18 Via the second vacuum pump 18, the remaining solvent vapor still remaining in the working chamber 4 is sucked off and compressed by the compressor 20.
  • the pressure is increased so that the residual solvent vapor can be condensed by an air or water cooling.
  • the pressure increase depends on the solvent used. When using e.g. Trichlorethylene or perchlorethylene as solvent, the pressure is increased to over 1 bar. When using methyl chloride, the pressure is increased to more than 2 bar. As a result, the solvent vapor is so warm that it is easily condensed with an air or water cooling.
  • the compressed over the compressor 20 steam is liquefied in part 8b of the condenser 8 and the condensate can be fed via the condensate separator 39 and the water separator 22 back to the reservoir 28.
  • a pressure-controlled shut-off valve or overflow valve can be provided, which opens only when the pressure on the pressure side by the vacuum pump 18 is reached. Also by this, the residual steam supplied to the condenser can be brought to a pressure which allows condensation with an air or water cooling.
  • valve 17 is closed.
  • the vent valve 5 can now be opened, whereby fresh air flows into the working chamber 4. If a pressure equalization between the environment and the working chamber 4, it can be opened and the cleaned workpieces can be removed.
  • the capacitor 8 is divided into two.
  • the capacitor can also be made in one piece, if appropriate measures to ensure the different pressure conditions are taken during the different condensation phases.

Landscapes

  • Cleaning By Liquid Or Steam (AREA)

Claims (3)

  1. Procédé pour le traitement d'un matériau à nettoyer dans une installation de nettoyage, qui contient une chambre de travail (4) verrouillable pour traiter le matériau à nettoyer avec un solvant, un générateur de vapeur (I) pour générer une vapeur saturée en solvant, une pompe à vide (18) pour vider à la pompe la vapeur saturée en solvant de la chambre de travail (4) après le traitement du matériau à nettoyer avec la vapeur saturée en solvant, un condensateur (8) pour la condensation de la vapeur saturée en solvant et une pompe (25) pour recycler le condensat de solvant dans un réservoir de stockage (28), avec les étapes de procédé suivantes :
    a) introduction du matériau dans la chambre de travail (4),
    b) évacuation de l'air de la chambre de travail (4), du condensateur (8) et d'un système de canalisation (9, 12), la chambre de travail (4) et le condensateur (8) sont reliés entre eux grâce à la génération d'un vide partiel important après la fermeture de la chambre de travail (4),
    c) introduction de solvant dans la chambre de travail (4) pour nettoyer le matériau avec le solvant, de la vapeur saturée en solvant étant à la fin amenée du générateur de vapeur (1) de la chambre de travail (4),
    d) réalisation d'une première liaison (14) entre la chambre de travail (4) et le condensateur (8), pour lequel il s'agit d'un condensateur refroidi à l'air ou à l'eau, jusqu'à ce qu'il existe une compensation de pression entre la chambre de travail (4) et le condensateur (8),
    e) interruption de la première liaison (14) et réalisation d'une seconde liaison (16) entre la chambre de travail (4) et le condensateur (8), après quoi, avec la pompe à vide (18), de la vapeur est aspirée de la chambre de travail (4), est comprimée à une pression supérieure à la pression atmosphérique, de sorte que la température de condensation de la vapeur de solvant est, pour la pression régnante, supérieure à la température de condensation, et est menée au condensateur (8).
    f) amenée du condensat de solvant généré dans le condensateur (8) vers le réservoir de stockage (28) pendant les étapes d) et e) et
    g) aération de la chambre de travail (4) après avoir atteint un vide partiel prédéfini dans la chambre de travail (4) et ouverture de la chambre de travail (4).
  2. Procédé selon la revendication 1, caractérisé en ce que la première et la seconde liaisons sont fermées après le retrait de l'air et sont maintenues fermées pendant le nettoyage du matériau de nettoyage.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'air à évacuer est refroidi.
EP02007976A 2001-04-12 2002-04-10 Procédé pour le fonctionnement d'un dispositif de nettoyage Expired - Lifetime EP1249263B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10118601 2001-04-12
DE10118601A DE10118601C1 (de) 2001-04-12 2001-04-12 Verfahren zum Betrieb einer Reinigungsanlage

Publications (3)

Publication Number Publication Date
EP1249263A2 EP1249263A2 (fr) 2002-10-16
EP1249263A3 EP1249263A3 (fr) 2003-01-22
EP1249263B1 true EP1249263B1 (fr) 2007-01-24

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ID=7681587

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02007976A Expired - Lifetime EP1249263B1 (fr) 2001-04-12 2002-04-10 Procédé pour le fonctionnement d'un dispositif de nettoyage

Country Status (2)

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EP (1) EP1249263B1 (fr)
DE (2) DE10118601C1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005042694A1 (de) 2004-12-30 2006-07-20 Volkswagen Ag Navigationssystem für ein Kraftfahrzeug
CN103128074B (zh) * 2011-11-25 2016-06-22 株式会社Ihi 真空清洗装置以及真空清洗方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5304253A (en) * 1990-09-12 1994-04-19 Baxter International Inc. Method for cleaning with a volatile solvent
US5538025A (en) * 1991-11-05 1996-07-23 Serec Partners Solvent cleaning system
IT1260831B (it) * 1992-07-17 1996-04-22 Procedimento di sgrassatura di pezzi meccanici ed impianto per effettuare il procedimento
DE19939032A1 (de) * 1999-03-24 2000-10-05 Wolf Gmbh Verfahren und Anlage zur Oberflächenbehandlung von Teilen mit einem Lösungsmittel

Also Published As

Publication number Publication date
EP1249263A3 (fr) 2003-01-22
DE10118601C1 (de) 2002-08-14
EP1249263A2 (fr) 2002-10-16
DE50209322D1 (de) 2007-03-15

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